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Date: Tue, 13 Apr 2010 17:05:18 +0400
From: Vladislav Bolkhovitin <vst@...b.net>
To: linux-scsi@...r.kernel.org
CC: linux-kernel@...r.kernel.org,
scst-devel <scst-devel@...ts.sourceforge.net>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Andrew Morton <akpm@...ux-foundation.org>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Jeff Garzik <jeff@...zik.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Vu Pham <vuhuong@...lanox.com>,
Bart Van Assche <bart.vanassche@...il.com>,
James Smart <James.Smart@...lex.Com>,
Joe Eykholt <jeykholt@...co.com>, Andy Yan <ayan@...vell.com>,
linux-driver@...gic.com
Subject: Re: [PATCH][RFC 5/12/1/5] SCST core's scst_lib.c
This patch contains file scst_lib.c.
Signed-off-by: Vladislav Bolkhovitin <vst@...b.net>
---
scst_lib.c | 6337 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 6337 insertions(+)
diff -uprN orig/linux-2.6.33/drivers/scst/scst_lib.c linux-2.6.33/drivers/scst/scst_lib.c
--- orig/linux-2.6.33/drivers/scst/scst_lib.c
+++ linux-2.6.33/drivers/scst/scst_lib.c
@@ -0,0 +1,6337 @@
+/*
+ * scst_lib.c
+ *
+ * Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <vst@...b.net>
+ * Copyright (C) 2004 - 2005 Leonid Stoljar
+ * Copyright (C) 2007 - 2010 ID7 Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+#include <linux/cdrom.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <asm/kmap_types.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+
+#include "scst.h"
+#include "scst_priv.h"
+#include "scst_mem.h"
+
+struct scsi_io_context {
+ unsigned int full_cdb_used:1;
+ void *data;
+ void (*done)(void *data, char *sense, int result, int resid);
+ char sense[SCST_SENSE_BUFFERSIZE];
+ unsigned char full_cdb[0];
+};
+static struct kmem_cache *scsi_io_context_cache;
+
+/* get_trans_len_x extract x bytes from cdb as length starting from off */
+static int get_trans_len_1(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_1_256(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_2(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_3(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_4(struct scst_cmd *cmd, uint8_t off);
+
+/* for special commands */
+static int get_trans_len_block_limit(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_read_capacity(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_serv_act_in(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_single(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_none(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_read_pos(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_cdb_len_10(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_prevent_allow_medium_removal(struct scst_cmd *cmd,
+ uint8_t off);
+static int get_trans_len_3_read_elem_stat(struct scst_cmd *cmd, uint8_t off);
+static int get_trans_len_start_stop(struct scst_cmd *cmd, uint8_t off);
+
+/*
++=====================================-============-======-
+| Command name | Operation | Type |
+| | code | |
+|-------------------------------------+------------+------+
+
++=========================================================+
+|Key: M = command implementation is mandatory. |
+| O = command implementation is optional. |
+| V = Vendor-specific |
+| R = Reserved |
+| ' '= DON'T use for this device |
++=========================================================+
+*/
+
+#define SCST_CDB_MANDATORY 'M' /* mandatory */
+#define SCST_CDB_OPTIONAL 'O' /* optional */
+#define SCST_CDB_VENDOR 'V' /* vendor */
+#define SCST_CDB_RESERVED 'R' /* reserved */
+#define SCST_CDB_NOTSUPP ' ' /* don't use */
+
+struct scst_sdbops {
+ uint8_t ops; /* SCSI-2 op codes */
+ uint8_t devkey[16]; /* Key for every device type M,O,V,R
+ * type_disk devkey[0]
+ * type_tape devkey[1]
+ * type_printer devkey[2]
+ * type_proseccor devkey[3]
+ * type_worm devkey[4]
+ * type_cdrom devkey[5]
+ * type_scanner devkey[6]
+ * type_mod devkey[7]
+ * type_changer devkey[8]
+ * type_commdev devkey[9]
+ * type_reserv devkey[A]
+ * type_reserv devkey[B]
+ * type_raid devkey[C]
+ * type_enclosure devkey[D]
+ * type_reserv devkey[E]
+ * type_reserv devkey[F]
+ */
+ const char *op_name; /* SCSI-2 op codes full name */
+ uint8_t direction; /* init --> target: SCST_DATA_WRITE
+ * target --> init: SCST_DATA_READ
+ */
+ uint16_t flags; /* opcode -- various flags */
+ uint8_t off; /* length offset in cdb */
+ int (*get_trans_len)(struct scst_cmd *cmd, uint8_t off)
+ __attribute__ ((aligned));
+} __attribute__((packed));
+
+static int scst_scsi_op_list[256];
+
+#define FLAG_NONE 0
+
+static const struct scst_sdbops scst_scsi_op_table[] = {
+ /*
+ * +-------------------> TYPE_IS_DISK (0)
+ * |
+ * |+------------------> TYPE_IS_TAPE (1)
+ * ||
+ * || +----------------> TYPE_IS_PROCESSOR (3)
+ * || |
+ * || | +--------------> TYPE_IS_CDROM (5)
+ * || | |
+ * || | | +------------> TYPE_IS_MOD (7)
+ * || | | |
+ * || | | |+-----------> TYPE_IS_CHANGER (8)
+ * || | | ||
+ * || | | || +-------> TYPE_IS_RAID (C)
+ * || | | || |
+ * || | | || |
+ * 0123456789ABCDEF ---> TYPE_IS_???? */
+
+ /* 6-bytes length CDB */
+ {0x00, "MMMMMMMMMMMMMMMM", "TEST UNIT READY",
+ /* let's be HQ to don't look dead under high load */
+ SCST_DATA_NONE, SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|
+ SCST_REG_RESERVE_ALLOWED,
+ 0, get_trans_len_none},
+ {0x01, " M ", "REWIND",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x01, "O V OO OO ", "REZERO UNIT",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x02, "VVVVVV V ", "REQUEST BLOCK ADDR",
+ SCST_DATA_NONE, SCST_SMALL_TIMEOUT, 0, get_trans_len_none},
+ {0x03, "MMMMMMMMMMMMMMMM", "REQUEST SENSE",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT|SCST_SKIP_UA|SCST_LOCAL_CMD|
+ SCST_REG_RESERVE_ALLOWED,
+ 4, get_trans_len_1},
+ {0x04, "M O O ", "FORMAT UNIT",
+ SCST_DATA_WRITE, SCST_LONG_TIMEOUT|SCST_UNKNOWN_LENGTH|SCST_WRITE_MEDIUM,
+ 0, get_trans_len_none},
+ {0x04, " O ", "FORMAT",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x05, "VMVVVV V ", "READ BLOCK LIMITS",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT|SCST_REG_RESERVE_ALLOWED,
+ 0, get_trans_len_block_limit},
+ {0x07, " O ", "INITIALIZE ELEMENT STATUS",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x07, "OVV O OV ", "REASSIGN BLOCKS",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x08, "O ", "READ(6)",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 4, get_trans_len_1_256},
+ {0x08, " MV OO OV ", "READ(6)",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 2, get_trans_len_3},
+ {0x08, " M ", "GET MESSAGE(6)",
+ SCST_DATA_READ, FLAG_NONE, 2, get_trans_len_3},
+ {0x08, " O ", "RECEIVE",
+ SCST_DATA_READ, FLAG_NONE, 2, get_trans_len_3},
+ {0x0A, "O ", "WRITE(6)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 4, get_trans_len_1_256},
+ {0x0A, " M O OV ", "WRITE(6)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 2, get_trans_len_3},
+ {0x0A, " M ", "PRINT",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x0A, " M ", "SEND MESSAGE(6)",
+ SCST_DATA_WRITE, FLAG_NONE, 2, get_trans_len_3},
+ {0x0A, " M ", "SEND(6)",
+ SCST_DATA_WRITE, FLAG_NONE, 2, get_trans_len_3},
+ {0x0B, "O OO OV ", "SEEK(6)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x0B, " ", "TRACK SELECT",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x0B, " O ", "SLEW AND PRINT",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x0C, "VVVVVV V ", "SEEK BLOCK",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x0D, "VVVVVV V ", "PARTITION",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
+ 0, get_trans_len_none},
+ {0x0F, "VOVVVV V ", "READ REVERSE",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 2, get_trans_len_3},
+ {0x10, "VM V V ", "WRITE FILEMARKS",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x10, " O O ", "SYNCHRONIZE BUFFER",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x11, "VMVVVV ", "SPACE",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x12, "MMMMMMMMMMMMMMMM", "INQUIRY",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|SCST_SKIP_UA|
+ SCST_REG_RESERVE_ALLOWED,
+ 4, get_trans_len_1},
+ {0x13, "VOVVVV ", "VERIFY(6)",
+ SCST_DATA_NONE, SCST_TRANSFER_LEN_TYPE_FIXED|
+ SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED,
+ 2, get_trans_len_3},
+ {0x14, "VOOVVV ", "RECOVER BUFFERED DATA",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 2, get_trans_len_3},
+ {0x15, "OMOOOOOOOOOOOOOO", "MODE SELECT(6)",
+ SCST_DATA_WRITE, SCST_LOCAL_CMD, 4, get_trans_len_1},
+ {0x16, "MMMMMMMMMMMMMMMM", "RESERVE",
+ SCST_DATA_NONE, SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD,
+ 0, get_trans_len_none},
+ {0x17, "MMMMMMMMMMMMMMMM", "RELEASE",
+ SCST_DATA_NONE, SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_REG_RESERVE_ALLOWED,
+ 0, get_trans_len_none},
+ {0x18, "OOOOOOOO ", "COPY",
+ SCST_DATA_WRITE, SCST_LONG_TIMEOUT, 2, get_trans_len_3},
+ {0x19, "VMVVVV ", "ERASE",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
+ 0, get_trans_len_none},
+ {0x1A, "OMOOOOOOOOOOOOOO", "MODE SENSE(6)",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT, 4, get_trans_len_1},
+ {0x1B, " O ", "SCAN",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x1B, " O ", "LOAD UNLOAD",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x1B, " O ", "STOP PRINT",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x1B, "O OO O O ", "START STOP UNIT",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_start_stop},
+ {0x1C, "OOOOOOOOOOOOOOOO", "RECEIVE DIAGNOSTIC RESULTS",
+ SCST_DATA_READ, FLAG_NONE, 3, get_trans_len_2},
+ {0x1D, "MMMMMMMMMMMMMMMM", "SEND DIAGNOSTIC",
+ SCST_DATA_WRITE, FLAG_NONE, 4, get_trans_len_1},
+ {0x1E, "OOOOOOOOOOOOOOOO", "PREVENT ALLOW MEDIUM REMOVAL",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0,
+ get_trans_len_prevent_allow_medium_removal},
+ {0x1F, " O ", "PORT STATUS",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+
+ /* 10-bytes length CDB */
+ {0x23, "V VV V ", "READ FORMAT CAPACITY",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x24, "V VVM ", "SET WINDOW",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_3},
+ {0x25, "M MM M ", "READ CAPACITY",
+ SCST_DATA_READ, SCST_IMPLICIT_HQ|SCST_REG_RESERVE_ALLOWED,
+ 0, get_trans_len_read_capacity},
+ {0x25, " O ", "GET WINDOW",
+ SCST_DATA_READ, FLAG_NONE, 6, get_trans_len_3},
+ {0x28, "M MMMM ", "READ(10)",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 7, get_trans_len_2},
+ {0x28, " O ", "GET MESSAGE(10)",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x29, "V VV O ", "READ GENERATION",
+ SCST_DATA_READ, FLAG_NONE, 8, get_trans_len_1},
+ {0x2A, "O MO M ", "WRITE(10)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 7, get_trans_len_2},
+ {0x2A, " O ", "SEND MESSAGE(10)",
+ SCST_DATA_WRITE, FLAG_NONE, 7, get_trans_len_2},
+ {0x2A, " O ", "SEND(10)",
+ SCST_DATA_WRITE, FLAG_NONE, 7, get_trans_len_2},
+ {0x2B, " O ", "LOCATE",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x2B, " O ", "POSITION TO ELEMENT",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x2B, "O OO O ", "SEEK(10)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x2C, "V O O ", "ERASE(10)",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
+ 0, get_trans_len_none},
+ {0x2D, "V O O ", "READ UPDATED BLOCK",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 0, get_trans_len_single},
+ {0x2E, "O OO O ", "WRITE AND VERIFY(10)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 7, get_trans_len_2},
+ {0x2F, "O OO O ", "VERIFY(10)",
+ SCST_DATA_NONE, SCST_TRANSFER_LEN_TYPE_FIXED|
+ SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED,
+ 7, get_trans_len_2},
+ {0x33, "O OO O ", "SET LIMITS(10)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x34, " O ", "READ POSITION",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT, 7, get_trans_len_read_pos},
+ {0x34, " O ", "GET DATA BUFFER STATUS",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x34, "O OO O ", "PRE-FETCH",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x35, "O OO O ", "SYNCHRONIZE CACHE",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x36, "O OO O ", "LOCK UNLOCK CACHE",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x37, "O O ", "READ DEFECT DATA(10)",
+ SCST_DATA_READ, FLAG_NONE, 8, get_trans_len_1},
+ {0x37, " O ", "INIT ELEMENT STATUS WRANGE",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x38, " O O ", "MEDIUM SCAN",
+ SCST_DATA_READ, FLAG_NONE, 8, get_trans_len_1},
+ {0x39, "OOOOOOOO ", "COMPARE",
+ SCST_DATA_WRITE, FLAG_NONE, 3, get_trans_len_3},
+ {0x3A, "OOOOOOOO ", "COPY AND VERIFY",
+ SCST_DATA_WRITE, FLAG_NONE, 3, get_trans_len_3},
+ {0x3B, "OOOOOOOOOOOOOOOO", "WRITE BUFFER",
+ SCST_DATA_WRITE, SCST_SMALL_TIMEOUT, 6, get_trans_len_3},
+ {0x3C, "OOOOOOOOOOOOOOOO", "READ BUFFER",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT, 6, get_trans_len_3},
+ {0x3D, " O O ", "UPDATE BLOCK",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED,
+ 0, get_trans_len_single},
+ {0x3E, "O OO O ", "READ LONG",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x3F, "O O O ", "WRITE LONG",
+ SCST_DATA_WRITE, SCST_WRITE_MEDIUM, 7, get_trans_len_2},
+ {0x40, "OOOOOOOOOO ", "CHANGE DEFINITION",
+ SCST_DATA_WRITE, SCST_SMALL_TIMEOUT, 8, get_trans_len_1},
+ {0x41, "O O ", "WRITE SAME",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 0, get_trans_len_single},
+ {0x42, " O ", "READ SUB-CHANNEL",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x43, " O ", "READ TOC/PMA/ATIP",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x44, " M ", "REPORT DENSITY SUPPORT",
+ SCST_DATA_READ, SCST_REG_RESERVE_ALLOWED, 7, get_trans_len_2},
+ {0x44, " O ", "READ HEADER",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x45, " O ", "PLAY AUDIO(10)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x46, " O ", "GET CONFIGURATION",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x47, " O ", "PLAY AUDIO MSF",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x48, " O ", "PLAY AUDIO TRACK INDEX",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x49, " O ", "PLAY TRACK RELATIVE(10)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x4A, " O ", "GET EVENT STATUS NOTIFICATION",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x4B, " O ", "PAUSE/RESUME",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x4C, "OOOOOOOOOOOOOOOO", "LOG SELECT",
+ SCST_DATA_WRITE, SCST_SMALL_TIMEOUT, 7, get_trans_len_2},
+ {0x4D, "OOOOOOOOOOOOOOOO", "LOG SENSE",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT|SCST_REG_RESERVE_ALLOWED,
+ 7, get_trans_len_2},
+ {0x4E, " O ", "STOP PLAY/SCAN",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x50, " ", "XDWRITE",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x51, " O ", "READ DISC INFORMATION",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x51, " ", "XPWRITE",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x52, " O ", "READ TRACK INFORMATION",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x53, " O ", "RESERVE TRACK",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x54, " O ", "SEND OPC INFORMATION",
+ SCST_DATA_WRITE, FLAG_NONE, 7, get_trans_len_2},
+ {0x55, "OOOOOOOOOOOOOOOO", "MODE SELECT(10)",
+ SCST_DATA_WRITE, SCST_LOCAL_CMD, 7, get_trans_len_2},
+ {0x56, "OOOOOOOOOOOOOOOO", "RESERVE(10)",
+ SCST_DATA_NONE, SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD,
+ 0, get_trans_len_none},
+ {0x57, "OOOOOOOOOOOOOOOO", "RELEASE(10)",
+ SCST_DATA_NONE, SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_REG_RESERVE_ALLOWED,
+ 0, get_trans_len_none},
+ {0x58, " O ", "REPAIR TRACK",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x5A, "OOOOOOOOOOOOOOOO", "MODE SENSE(10)",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT, 7, get_trans_len_2},
+ {0x5B, " O ", "CLOSE TRACK/SESSION",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x5C, " O ", "READ BUFFER CAPACITY",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_2},
+ {0x5D, " O ", "SEND CUE SHEET",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_3},
+ {0x5E, "OOOOO OOOO ", "PERSISTENT RESERV IN",
+ SCST_DATA_READ, FLAG_NONE, 5, get_trans_len_4},
+ {0x5F, "OOOOO OOOO ", "PERSISTENT RESERV OUT",
+ SCST_DATA_WRITE, FLAG_NONE, 5, get_trans_len_4},
+
+ /* 16-bytes length CDB */
+ {0x80, "O OO O ", "XDWRITE EXTENDED",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x80, " M ", "WRITE FILEMARKS",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0x81, "O OO O ", "REBUILD",
+ SCST_DATA_WRITE, SCST_WRITE_MEDIUM, 10, get_trans_len_4},
+ {0x82, "O OO O ", "REGENERATE",
+ SCST_DATA_WRITE, SCST_WRITE_MEDIUM, 10, get_trans_len_4},
+ {0x83, "OOOOOOOOOOOOOOOO", "EXTENDED COPY",
+ SCST_DATA_WRITE, SCST_WRITE_MEDIUM, 10, get_trans_len_4},
+ {0x84, "OOOOOOOOOOOOOOOO", "RECEIVE COPY RESULT",
+ SCST_DATA_WRITE, FLAG_NONE, 10, get_trans_len_4},
+ {0x86, "OOOOOOOOOO ", "ACCESS CONTROL IN",
+ SCST_DATA_NONE, SCST_REG_RESERVE_ALLOWED, 0, get_trans_len_none},
+ {0x87, "OOOOOOOOOO ", "ACCESS CONTROL OUT",
+ SCST_DATA_NONE, SCST_REG_RESERVE_ALLOWED, 0, get_trans_len_none},
+ {0x88, "M MMMM ", "READ(16)",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 10, get_trans_len_4},
+ {0x8A, "O OO O ", "WRITE(16)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 10, get_trans_len_4},
+ {0x8C, "OOOOOOOOOO ", "READ ATTRIBUTE",
+ SCST_DATA_READ, FLAG_NONE, 10, get_trans_len_4},
+ {0x8D, "OOOOOOOOOO ", "WRITE ATTRIBUTE",
+ SCST_DATA_WRITE, SCST_WRITE_MEDIUM, 10, get_trans_len_4},
+ {0x8E, "O OO O ", "WRITE AND VERIFY(16)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 10, get_trans_len_4},
+ {0x8F, "O OO O ", "VERIFY(16)",
+ SCST_DATA_NONE, SCST_TRANSFER_LEN_TYPE_FIXED|
+ SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED,
+ 10, get_trans_len_4},
+ {0x90, "O OO O ", "PRE-FETCH(16)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x91, "O OO O ", "SYNCHRONIZE CACHE(16)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x91, " M ", "SPACE(16)",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x92, "O OO O ", "LOCK UNLOCK CACHE(16)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0x92, " O ", "LOCATE(16)",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0x93, "O O ", "WRITE SAME(16)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 10, get_trans_len_4},
+ {0x93, " M ", "ERASE(16)",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
+ 0, get_trans_len_none},
+ {0x9E, "O ", "SERVICE ACTION IN",
+ SCST_DATA_READ, FLAG_NONE, 0, get_trans_len_serv_act_in},
+
+ /* 12-bytes length CDB */
+ {0xA0, "VVVVVVVVVV M ", "REPORT LUNS",
+ SCST_DATA_READ, SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|SCST_SKIP_UA|
+ SCST_FULLY_LOCAL_CMD|SCST_LOCAL_CMD|
+ SCST_REG_RESERVE_ALLOWED,
+ 6, get_trans_len_4},
+ {0xA1, " O ", "BLANK",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0xA3, " O ", "SEND KEY",
+ SCST_DATA_WRITE, FLAG_NONE, 8, get_trans_len_2},
+ {0xA3, "OOOOO OOOO ", "REPORT DEVICE IDENTIDIER",
+ SCST_DATA_READ, SCST_REG_RESERVE_ALLOWED, 6, get_trans_len_4},
+ {0xA3, " M ", "MAINTENANCE(IN)",
+ SCST_DATA_READ, FLAG_NONE, 6, get_trans_len_4},
+ {0xA4, " O ", "REPORT KEY",
+ SCST_DATA_READ, FLAG_NONE, 8, get_trans_len_2},
+ {0xA4, " O ", "MAINTENANCE(OUT)",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_4},
+ {0xA5, " M ", "MOVE MEDIUM",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0xA5, " O ", "PLAY AUDIO(12)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0xA6, " O O ", "EXCHANGE/LOAD/UNLOAD MEDIUM",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0xA7, " O ", "SET READ AHEAD",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0xA8, " O ", "GET MESSAGE(12)",
+ SCST_DATA_READ, FLAG_NONE, 6, get_trans_len_4},
+ {0xA8, "O OO O ", "READ(12)",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 6, get_trans_len_4},
+ {0xA9, " O ", "PLAY TRACK RELATIVE(12)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0xAA, "O OO O ", "WRITE(12)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 6, get_trans_len_4},
+ {0xAA, " O ", "SEND MESSAGE(12)",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_4},
+ {0xAC, " O ", "ERASE(12)",
+ SCST_DATA_NONE, SCST_WRITE_MEDIUM, 0, get_trans_len_none},
+ {0xAC, " M ", "GET PERFORMANCE",
+ SCST_DATA_READ, SCST_UNKNOWN_LENGTH, 0, get_trans_len_none},
+ {0xAD, " O ", "READ DVD STRUCTURE",
+ SCST_DATA_READ, FLAG_NONE, 8, get_trans_len_2},
+ {0xAE, "O OO O ", "WRITE AND VERIFY(12)",
+ SCST_DATA_WRITE, SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
+ 6, get_trans_len_4},
+ {0xAF, "O OO O ", "VERIFY(12)",
+ SCST_DATA_NONE, SCST_TRANSFER_LEN_TYPE_FIXED|
+ SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED,
+ 6, get_trans_len_4},
+#if 0 /* No need to support at all */
+ {0xB0, " OO O ", "SEARCH DATA HIGH(12)",
+ SCST_DATA_WRITE, FLAG_NONE, 9, get_trans_len_1},
+ {0xB1, " OO O ", "SEARCH DATA EQUAL(12)",
+ SCST_DATA_WRITE, FLAG_NONE, 9, get_trans_len_1},
+ {0xB2, " OO O ", "SEARCH DATA LOW(12)",
+ SCST_DATA_WRITE, FLAG_NONE, 9, get_trans_len_1},
+#endif
+ {0xB3, " OO O ", "SET LIMITS(12)",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0xB5, " O ", "REQUEST VOLUME ELEMENT ADDRESS",
+ SCST_DATA_READ, FLAG_NONE, 9, get_trans_len_1},
+ {0xB6, " O ", "SEND VOLUME TAG",
+ SCST_DATA_WRITE, FLAG_NONE, 9, get_trans_len_1},
+ {0xB6, " M ", "SET STREAMING",
+ SCST_DATA_WRITE, FLAG_NONE, 9, get_trans_len_2},
+ {0xB7, " O ", "READ DEFECT DATA(12)",
+ SCST_DATA_READ, FLAG_NONE, 9, get_trans_len_1},
+ {0xB8, " O ", "READ ELEMENT STATUS",
+ SCST_DATA_READ, FLAG_NONE, 7, get_trans_len_3_read_elem_stat},
+ {0xB9, " O ", "READ CD MSF",
+ SCST_DATA_READ, SCST_UNKNOWN_LENGTH, 0, get_trans_len_none},
+ {0xBA, " O ", "SCAN",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+ {0xBA, " O ", "REDUNDANCY GROUP(IN)",
+ SCST_DATA_READ, FLAG_NONE, 6, get_trans_len_4},
+ {0xBB, " O ", "SET SPEED",
+ SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+ {0xBB, " O ", "REDUNDANCY GROUP(OUT)",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_4},
+ {0xBC, " O ", "SPARE(IN)",
+ SCST_DATA_READ, FLAG_NONE, 6, get_trans_len_4},
+ {0xBD, " O ", "MECHANISM STATUS",
+ SCST_DATA_READ, FLAG_NONE, 8, get_trans_len_2},
+ {0xBD, " O ", "SPARE(OUT)",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_4},
+ {0xBE, " O ", "READ CD",
+ SCST_DATA_READ, SCST_TRANSFER_LEN_TYPE_FIXED, 6, get_trans_len_3},
+ {0xBE, " O ", "VOLUME SET(IN)",
+ SCST_DATA_READ, FLAG_NONE, 6, get_trans_len_4},
+ {0xBF, " O ", "SEND DVD STRUCTUE",
+ SCST_DATA_WRITE, FLAG_NONE, 8, get_trans_len_2},
+ {0xBF, " O ", "VOLUME SET(OUT)",
+ SCST_DATA_WRITE, FLAG_NONE, 6, get_trans_len_4},
+ {0xE7, " V ", "INIT ELEMENT STATUS WRANGE",
+ SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_cdb_len_10}
+};
+
+#define SCST_CDB_TBL_SIZE ((int)ARRAY_SIZE(scst_scsi_op_table))
+
+static void scst_free_tgt_dev(struct scst_tgt_dev *tgt_dev);
+static void scst_check_internal_sense(struct scst_device *dev, int result,
+ uint8_t *sense, int sense_len);
+static void scst_queue_report_luns_changed_UA(struct scst_session *sess,
+ int flags);
+static void __scst_check_set_UA(struct scst_tgt_dev *tgt_dev,
+ const uint8_t *sense, int sense_len, int flags);
+static void scst_alloc_set_UA(struct scst_tgt_dev *tgt_dev,
+ const uint8_t *sense, int sense_len, int flags);
+static void scst_free_all_UA(struct scst_tgt_dev *tgt_dev);
+static void scst_release_space(struct scst_cmd *cmd);
+static void scst_unblock_cmds(struct scst_device *dev);
+static void scst_clear_reservation(struct scst_tgt_dev *tgt_dev);
+static struct scst_tgt_dev *scst_alloc_add_tgt_dev(struct scst_session *sess,
+ struct scst_acg_dev *acg_dev);
+static void scst_tgt_retry_timer_fn(unsigned long arg);
+
+#ifdef CONFIG_SCST_DEBUG_TM
+static void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev);
+static void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev);
+#else
+static inline void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev) {}
+static inline void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev) {}
+#endif /* CONFIG_SCST_DEBUG_TM */
+
+/**
+ * scst_alloc_sense() - allocate sense buffer for command
+ *
+ * Allocates, if necessary, sense buffer for command. Returns 0 on success
+ * and error code othrwise. Parameter "atomic" should be non-0 if the
+ * function called in atomic context.
+ */
+int scst_alloc_sense(struct scst_cmd *cmd, int atomic)
+{
+ int res = 0;
+ gfp_t gfp_mask = atomic ? GFP_ATOMIC : (GFP_KERNEL|__GFP_NOFAIL);
+
+ if (cmd->sense != NULL)
+ goto memzero;
+
+ cmd->sense = mempool_alloc(scst_sense_mempool, gfp_mask);
+ if (cmd->sense == NULL) {
+ PRINT_CRIT_ERROR("Sense memory allocation failed (op %x). "
+ "The sense data will be lost!!", cmd->cdb[0]);
+ res = -ENOMEM;
+ goto out;
+ }
+
+ cmd->sense_buflen = SCST_SENSE_BUFFERSIZE;
+
+memzero:
+ cmd->sense_valid_len = 0;
+ memset(cmd->sense, 0, cmd->sense_buflen);
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(scst_alloc_sense);
+
+/**
+ * scst_alloc_set_sense() - allocate and fill sense buffer for command
+ *
+ * Allocates, if necessary, sense buffer for command and copies in
+ * it data from the supplied sense buffer. Returns 0 on success
+ * and error code othrwise.
+ */
+int scst_alloc_set_sense(struct scst_cmd *cmd, int atomic,
+ const uint8_t *sense, unsigned int len)
+{
+ int res;
+
+ /*
+ * We don't check here if the existing sense is valid or not, because
+ * we suppose the caller did it based on cmd->status.
+ */
+
+ res = scst_alloc_sense(cmd, atomic);
+ if (res != 0) {
+ PRINT_BUFFER("Lost sense", sense, len);
+ goto out;
+ }
+
+ cmd->sense_valid_len = len;
+ if (cmd->sense_buflen < len) {
+ PRINT_WARNING("Sense truncated (needed %d), shall you increase "
+ "SCST_SENSE_BUFFERSIZE? Op: %x", len, cmd->cdb[0]);
+ cmd->sense_valid_len = cmd->sense_buflen;
+ }
+
+ memcpy(cmd->sense, sense, cmd->sense_valid_len);
+ TRACE_BUFFER("Sense set", cmd->sense, cmd->sense_valid_len);
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(scst_alloc_set_sense);
+
+/**
+ * scst_set_cmd_error_status() - set error SCSI status
+ * @cmd: SCST command
+ * @status: SCSI status to set
+ *
+ * Description:
+ * Sets error SCSI status in the command and prepares it for returning it.
+ * Returns 0 on success, error code otherwise.
+ */
+int scst_set_cmd_error_status(struct scst_cmd *cmd, int status)
+{
+ int res = 0;
+
+ if (cmd->status != 0) {
+ TRACE_MGMT_DBG("cmd %p already has status %x set", cmd,
+ cmd->status);
+ res = -EEXIST;
+ goto out;
+ }
+
+ cmd->status = status;
+ cmd->host_status = DID_OK;
+
+ cmd->dbl_ua_orig_resp_data_len = cmd->resp_data_len;
+ cmd->dbl_ua_orig_data_direction = cmd->data_direction;
+
+ cmd->data_direction = SCST_DATA_NONE;
+ cmd->resp_data_len = 0;
+ cmd->is_send_status = 1;
+
+ cmd->completed = 1;
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(scst_set_cmd_error_status);
+
+static int scst_set_lun_not_supported_request_sense(struct scst_cmd *cmd,
+ int key, int asc, int ascq)
+{
+ int res;
+ int sense_len;
+
+ if (cmd->status != 0) {
+ TRACE_MGMT_DBG("cmd %p already has status %x set", cmd,
+ cmd->status);
+ res = -EEXIST;
+ goto out;
+ }
+
+ if ((cmd->sg != NULL) && SCST_SENSE_VALID(sg_virt(cmd->sg))) {
+ TRACE_MGMT_DBG("cmd %p already has sense set", cmd);
+ res = -EEXIST;
+ goto out;
+ }
+
+ if (cmd->sg == NULL) {
+ if (cmd->bufflen == 0)
+ cmd->bufflen = cmd->cdb[4];
+
+ cmd->sg = scst_alloc(cmd->bufflen, GFP_ATOMIC, &cmd->sg_cnt);
+ if (cmd->sg == NULL) {
+ PRINT_ERROR("Unable to alloc sg for REQUEST SENSE"
+ "(sense %x/%x/%x)", key, asc, ascq);
+ res = 1;
+ goto out;
+ }
+ }
+
+ TRACE_MEM("sg %p alloced for sense for cmd %p (cnt %d, "
+ "len %d)", cmd->sg, cmd, cmd->sg_cnt, cmd->bufflen);
+
+ sense_len = scst_set_sense(sg_virt(cmd->sg),
+ cmd->bufflen, cmd->cdb[1] & 1, key, asc, ascq);
+ scst_set_resp_data_len(cmd, sense_len);
+
+ TRACE_BUFFER("Sense set", sg_virt(cmd->sg), sense_len);
+
+ res = 0;
+ cmd->completed = 1;
+
+out:
+ return res;
+}
+
+static int scst_set_lun_not_supported_inquiry(struct scst_cmd *cmd)
+{
+ int res;
+ uint8_t *buf;
+ int len;
+
+ if (cmd->status != 0) {
+ TRACE_MGMT_DBG("cmd %p already has status %x set", cmd,
+ cmd->status);
+ res = -EEXIST;
+ goto out;
+ }
+
+ if (cmd->sg == NULL) {
+ if (cmd->bufflen == 0)
+ cmd->bufflen = min_t(int, 36, (cmd->cdb[3] << 8) | cmd->cdb[4]);
+
+ cmd->sg = scst_alloc(cmd->bufflen, GFP_ATOMIC, &cmd->sg_cnt);
+ if (cmd->sg == NULL) {
+ PRINT_ERROR("%s", "Unable to alloc sg for INQUIRY "
+ "for not supported LUN");
+ res = 1;
+ goto out;
+ }
+ }
+
+ TRACE_MEM("sg %p alloced INQUIRY for cmd %p (cnt %d, len %d)",
+ cmd->sg, cmd, cmd->sg_cnt, cmd->bufflen);
+
+ buf = sg_virt(cmd->sg);
+ len = min_t(int, 36, cmd->bufflen);
+
+ memset(buf, 0, len);
+ buf[0] = 0x7F; /* Peripheral qualifier 011b, Peripheral device type 1Fh */
+
+ TRACE_BUFFER("INQUIRY for not supported LUN set", buf, len);
+
+ res = 0;
+ cmd->completed = 1;
+
+out:
+ return res;
+}
+
+/**
+ * scst_set_cmd_error() - set error in the command and fill the sense buffer.
+ *
+ * Sets error in the command and fill the sense buffer. Returns 0 on success,
+ * error code otherwise.
+ */
+int scst_set_cmd_error(struct scst_cmd *cmd, int key, int asc, int ascq)
+{
+ int res;
+
+ /*
+ * We need for LOGICAL UNIT NOT SUPPORTED special handling for
+ * REQUEST SENSE and INQUIRY.
+ */
+ if ((key == ILLEGAL_REQUEST) && (asc == 0x25) && (ascq == 0)) {
+ if (cmd->cdb[0] == REQUEST_SENSE)
+ res = scst_set_lun_not_supported_request_sense(cmd,
+ key, asc, ascq);
+ else if (cmd->cdb[0] == INQUIRY)
+ res = scst_set_lun_not_supported_inquiry(cmd);
+ else
+ goto do_sense;
+
+ if (res > 0)
+ goto do_sense;
+ else
+ goto out;
+ }
+
+do_sense:
+ res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION);
+ if (res != 0)
+ goto out;
+
+ res = scst_alloc_sense(cmd, 1);
+ if (res != 0) {
+ PRINT_ERROR("Lost sense data (key %x, asc %x, ascq %x)",
+ key, asc, ascq);
+ goto out;
+ }
+
+ cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen,
+ scst_get_cmd_dev_d_sense(cmd), key, asc, ascq);
+ TRACE_BUFFER("Sense set", cmd->sense, cmd->sense_valid_len);
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(scst_set_cmd_error);
+
+/**
+ * scst_set_sense() - set sense from KEY/ASC/ASCQ numbers
+ *
+ * Sets the corresponding fields in the sense buffer taking sense type
+ * into account. Returns resulting sense length.
+ */
+int scst_set_sense(uint8_t *buffer, int len, bool d_sense,
+ int key, int asc, int ascq)
+{
+ int res;
+
+ BUG_ON(len == 0);
+
+ memset(buffer, 0, len);
+
+ if (d_sense) {
+ /* Descriptor format */
+ if (len < 8) {
+ PRINT_ERROR("Length %d of sense buffer too small to "
+ "fit sense %x:%x:%x", len, key, asc, ascq);
+ }
+
+ buffer[0] = 0x72; /* Response Code */
+ if (len > 1)
+ buffer[1] = key; /* Sense Key */
+ if (len > 2)
+ buffer[2] = asc; /* ASC */
+ if (len > 3)
+ buffer[3] = ascq; /* ASCQ */
+ res = 8;
+ } else {
+ /* Fixed format */
+ if (len < 18) {
+ PRINT_ERROR("Length %d of sense buffer too small to "
+ "fit sense %x:%x:%x", len, key, asc, ascq);
+ }
+
+ buffer[0] = 0x70; /* Response Code */
+ if (len > 2)
+ buffer[2] = key; /* Sense Key */
+ if (len > 7)
+ buffer[7] = 0x0a; /* Additional Sense Length */
+ if (len > 12)
+ buffer[12] = asc; /* ASC */
+ if (len > 13)
+ buffer[13] = ascq; /* ASCQ */
+ res = 18;
+ }
+
+ TRACE_BUFFER("Sense set", buffer, res);
+ return res;
+}
+EXPORT_SYMBOL(scst_set_sense);
+
+/**
+ * scst_analyze_sense() - analyze sense
+ *
+ * Returns true if sense matches to (key, asc, ascq) and false otherwise.
+ * Valid_mask is one or several SCST_SENSE_*_VALID constants setting valid
+ * (key, asc, ascq) values.
+ */
+bool scst_analyze_sense(const uint8_t *sense, int len, unsigned int valid_mask,
+ int key, int asc, int ascq)
+{
+ bool res = false;
+
+ /* Response Code */
+ if ((sense[0] == 0x70) || (sense[0] == 0x71)) {
+ /* Fixed format */
+
+ /* Sense Key */
+ if (valid_mask & SCST_SENSE_KEY_VALID) {
+ if (len < 3)
+ goto out;
+ if (sense[2] != key)
+ goto out;
+ }
+
+ /* ASC */
+ if (valid_mask & SCST_SENSE_ASC_VALID) {
+ if (len < 13)
+ goto out;
+ if (sense[12] != asc)
+ goto out;
+ }
+
+ /* ASCQ */
+ if (valid_mask & SCST_SENSE_ASCQ_VALID) {
+ if (len < 14)
+ goto out;
+ if (sense[13] != ascq)
+ goto out;
+ }
+ } else if ((sense[0] == 0x72) || (sense[0] == 0x73)) {
+ /* Descriptor format */
+
+ /* Sense Key */
+ if (valid_mask & SCST_SENSE_KEY_VALID) {
+ if (len < 2)
+ goto out;
+ if (sense[1] != key)
+ goto out;
+ }
+
+ /* ASC */
+ if (valid_mask & SCST_SENSE_ASC_VALID) {
+ if (len < 3)
+ goto out;
+ if (sense[2] != asc)
+ goto out;
+ }
+
+ /* ASCQ */
+ if (valid_mask & SCST_SENSE_ASCQ_VALID) {
+ if (len < 4)
+ goto out;
+ if (sense[3] != ascq)
+ goto out;
+ }
+ } else
+ goto out;
+
+ res = true;
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(scst_analyze_sense);
+
+/**
+ * scst_is_ua_sense() - determine if the sense is UA sense
+ *
+ * Returns true if the sense is valid and carrying a Unit
+ * Attention or false otherwise.
+ */
+bool scst_is_ua_sense(const uint8_t *sense, int len)
+{
+ if (SCST_SENSE_VALID(sense))
+ return scst_analyze_sense(sense, len,
+ SCST_SENSE_KEY_VALID, UNIT_ATTENTION, 0, 0);
+ else
+ return false;
+}
+EXPORT_SYMBOL(scst_is_ua_sense);
+
+bool scst_is_ua_global(const uint8_t *sense, int len)
+{
+ bool res;
+
+ /* Changing it don't forget to change scst_requeue_ua() as well!! */
+
+ if (scst_analyze_sense(sense, len, SCST_SENSE_ALL_VALID,
+ SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed)))
+ res = true;
+ else
+ res = false;
+
+ return res;
+}
+
+/**
+ * scst_check_convert_sense() - check sense type and convert it if needed
+ *
+ * Checks if sense in the sense buffer, if any, is in the correct format.
+ * If not, converts it in the correct format.
+ */
+void scst_check_convert_sense(struct scst_cmd *cmd)
+{
+ bool d_sense;
+
+ if ((cmd->sense == NULL) || (cmd->status != SAM_STAT_CHECK_CONDITION))
+ goto out;
+
+ d_sense = scst_get_cmd_dev_d_sense(cmd);
+ if (d_sense && ((cmd->sense[0] == 0x70) || (cmd->sense[0] == 0x71))) {
+ TRACE_MGMT_DBG("Converting fixed sense to descriptor (cmd %p)",
+ cmd);
+ if ((cmd->sense_valid_len < 18)) {
+ PRINT_ERROR("Sense too small to convert (%d, "
+ "type: fixed)", cmd->sense_buflen);
+ goto out;
+ }
+ cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen,
+ d_sense, cmd->sense[2], cmd->sense[12], cmd->sense[13]);
+ } else if (!d_sense && ((cmd->sense[0] == 0x72) ||
+ (cmd->sense[0] == 0x73))) {
+ TRACE_MGMT_DBG("Converting descriptor sense to fixed (cmd %p)",
+ cmd);
+ if ((cmd->sense_buflen < 18) || (cmd->sense_valid_len < 8)) {
+ PRINT_ERROR("Sense too small to convert (%d, "
+ "type: descryptor, valid %d)",
+ cmd->sense_buflen, cmd->sense_valid_len);
+ goto out;
+ }
+ cmd->sense_valid_len = scst_set_sense(cmd->sense,
+ cmd->sense_buflen, d_sense,
+ cmd->sense[1], cmd->sense[2], cmd->sense[3]);
+ }
+
+out:
+ return;
+}
+EXPORT_SYMBOL(scst_check_convert_sense);
+
+static int scst_set_cmd_error_sense(struct scst_cmd *cmd, uint8_t *sense,
+ unsigned int len)
+{
+ int res;
+
+ res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION);
+ if (res != 0)
+ goto out;
+
+ res = scst_alloc_set_sense(cmd, 1, sense, len);
+
+out:
+ return res;
+}
+
+/**
+ * scst_set_busy() - set BUSY or TASK QUEUE FULL status
+ *
+ * Sets BUSY or TASK QUEUE FULL status depending on if this session has other
+ * outstanding commands or not.
+ */
+void scst_set_busy(struct scst_cmd *cmd)
+{
+ int c = atomic_read(&cmd->sess->sess_cmd_count);
+
+ if ((c <= 1) || (cmd->sess->init_phase != SCST_SESS_IPH_READY)) {
+ scst_set_cmd_error_status(cmd, SAM_STAT_BUSY);
+ TRACE(TRACE_FLOW_CONTROL, "Sending BUSY status to initiator %s "
+ "(cmds count %d, queue_type %x, sess->init_phase %d)",
+ cmd->sess->initiator_name, c,
+ cmd->queue_type, cmd->sess->init_phase);
+ } else {
+ scst_set_cmd_error_status(cmd, SAM_STAT_TASK_SET_FULL);
+ TRACE(TRACE_FLOW_CONTROL, "Sending QUEUE_FULL status to "
+ "initiator %s (cmds count %d, queue_type %x, "
+ "sess->init_phase %d)", cmd->sess->initiator_name, c,
+ cmd->queue_type, cmd->sess->init_phase);
+ }
+ return;
+}
+EXPORT_SYMBOL(scst_set_busy);
+
+/**
+ * scst_set_initial_UA() - set initial Unit Attention
+ *
+ * Sets initial Unit Attention on all devices of the session,
+ * replacing default scst_sense_reset_UA
+ */
+void scst_set_initial_UA(struct scst_session *sess, int key, int asc, int ascq)
+{
+ int i;
+
+ TRACE_MGMT_DBG("Setting for sess %p initial UA %x/%x/%x", sess, key,
+ asc, ascq);
+
+ /* Protect sess_tgt_dev_list_hash */
+ mutex_lock(&scst_mutex);
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[i];
+ struct scst_tgt_dev *tgt_dev;
+
+ list_for_each_entry(tgt_dev, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ spin_lock_bh(&tgt_dev->tgt_dev_lock);
+ if (!list_empty(&tgt_dev->UA_list)) {
+ struct scst_tgt_dev_UA *ua;
+
+ ua = list_entry(tgt_dev->UA_list.next,
+ typeof(*ua), UA_list_entry);
+ if (scst_analyze_sense(ua->UA_sense_buffer,
+ ua->UA_valid_sense_len,
+ SCST_SENSE_ALL_VALID,
+ SCST_LOAD_SENSE(scst_sense_reset_UA))) {
+ ua->UA_valid_sense_len = scst_set_sense(
+ ua->UA_sense_buffer,
+ sizeof(ua->UA_sense_buffer),
+ tgt_dev->dev->d_sense,
+ key, asc, ascq);
+ } else
+ PRINT_ERROR("%s",
+ "The first UA isn't RESET UA");
+ } else
+ PRINT_ERROR("%s", "There's no RESET UA to "
+ "replace");
+ spin_unlock_bh(&tgt_dev->tgt_dev_lock);
+ }
+ }
+
+ mutex_unlock(&scst_mutex);
+ return;
+}
+EXPORT_SYMBOL(scst_set_initial_UA);
+
+static struct scst_aen *scst_alloc_aen(struct scst_session *sess,
+ uint64_t unpacked_lun)
+{
+ struct scst_aen *aen;
+
+ aen = mempool_alloc(scst_aen_mempool, GFP_KERNEL);
+ if (aen == NULL) {
+ PRINT_ERROR("AEN memory allocation failed. Corresponding "
+ "event notification will not be performed (initiator "
+ "%s)", sess->initiator_name);
+ goto out;
+ }
+ memset(aen, 0, sizeof(*aen));
+
+ aen->sess = sess;
+ scst_sess_get(sess);
+
+ aen->lun = scst_pack_lun(unpacked_lun, sess->acg->addr_method);
+
+out:
+ return aen;
+};
+
+static void scst_free_aen(struct scst_aen *aen)
+{
+
+ scst_sess_put(aen->sess);
+ mempool_free(aen, scst_aen_mempool);
+ return;
+};
+
+/* Must be called under scst_mutex */
+void scst_gen_aen_or_ua(struct scst_tgt_dev *tgt_dev,
+ int key, int asc, int ascq)
+{
+ struct scst_tgt_template *tgtt = tgt_dev->sess->tgt->tgtt;
+ uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
+ int sl;
+
+ if (tgtt->report_aen != NULL) {
+ struct scst_aen *aen;
+ int rc;
+
+ aen = scst_alloc_aen(tgt_dev->sess, tgt_dev->lun);
+ if (aen == NULL)
+ goto queue_ua;
+
+ aen->event_fn = SCST_AEN_SCSI;
+ aen->aen_sense_len = scst_set_sense(aen->aen_sense,
+ sizeof(aen->aen_sense), tgt_dev->dev->d_sense,
+ key, asc, ascq);
+
+ TRACE_DBG("Calling target's %s report_aen(%p)",
+ tgtt->name, aen);
+ rc = tgtt->report_aen(aen);
+ TRACE_DBG("Target's %s report_aen(%p) returned %d",
+ tgtt->name, aen, rc);
+ if (rc == SCST_AEN_RES_SUCCESS)
+ goto out;
+
+ scst_free_aen(aen);
+ }
+
+queue_ua:
+ TRACE_MGMT_DBG("AEN not supported, queuing plain UA (tgt_dev %p)",
+ tgt_dev);
+ sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
+ tgt_dev->dev->d_sense, key, asc, ascq);
+ scst_check_set_UA(tgt_dev, sense_buffer, sl, 0);
+
+out:
+ return;
+}
+
+/**
+ * scst_capacity_data_changed() - notify SCST about device capacity change
+ *
+ * Notifies SCST core that dev has changed its capacity. Called under no locks.
+ */
+void scst_capacity_data_changed(struct scst_device *dev)
+{
+ struct scst_tgt_dev *tgt_dev;
+
+ if (dev->type != TYPE_DISK) {
+ TRACE_MGMT_DBG("Device type %d isn't for CAPACITY DATA "
+ "CHANGED UA", dev->type);
+ goto out;
+ }
+
+ TRACE_MGMT_DBG("CAPACITY DATA CHANGED (dev %p)", dev);
+
+ mutex_lock(&scst_mutex);
+
+ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ scst_gen_aen_or_ua(tgt_dev,
+ SCST_LOAD_SENSE(scst_sense_capacity_data_changed));
+ }
+
+ mutex_unlock(&scst_mutex);
+
+out:
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_capacity_data_changed);
+
+static inline bool scst_is_report_luns_changed_type(int type)
+{
+ switch (type) {
+ case TYPE_DISK:
+ case TYPE_TAPE:
+ case TYPE_PRINTER:
+ case TYPE_PROCESSOR:
+ case TYPE_WORM:
+ case TYPE_ROM:
+ case TYPE_SCANNER:
+ case TYPE_MOD:
+ case TYPE_MEDIUM_CHANGER:
+ case TYPE_RAID:
+ case TYPE_ENCLOSURE:
+ return true;
+ default:
+ return false;
+ }
+}
+
+/* scst_mutex supposed to be held */
+static void scst_queue_report_luns_changed_UA(struct scst_session *sess,
+ int flags)
+{
+ uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
+ struct list_head *shead;
+ struct scst_tgt_dev *tgt_dev;
+ int i;
+
+ TRACE_MGMT_DBG("Queuing REPORTED LUNS DATA CHANGED UA "
+ "(sess %p)", sess);
+
+ local_bh_disable();
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry(tgt_dev, shead,
+ sess_tgt_dev_list_entry) {
+ /* Lockdep triggers here a false positive.. */
+ spin_lock(&tgt_dev->tgt_dev_lock);
+ }
+ }
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry(tgt_dev, shead,
+ sess_tgt_dev_list_entry) {
+ int sl;
+
+ if (!scst_is_report_luns_changed_type(
+ tgt_dev->dev->type))
+ continue;
+
+ sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
+ tgt_dev->dev->d_sense,
+ SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed));
+
+ __scst_check_set_UA(tgt_dev, sense_buffer,
+ sl, flags | SCST_SET_UA_FLAG_GLOBAL);
+ }
+ }
+
+ for (i = TGT_DEV_HASH_SIZE-1; i >= 0; i--) {
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry_reverse(tgt_dev,
+ shead, sess_tgt_dev_list_entry) {
+ spin_unlock(&tgt_dev->tgt_dev_lock);
+ }
+ }
+
+ local_bh_enable();
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+static void scst_report_luns_changed_sess(struct scst_session *sess)
+{
+ int i;
+ struct scst_tgt_template *tgtt = sess->tgt->tgtt;
+ int d_sense = 0;
+ uint64_t lun = 0;
+
+ TRACE_DBG("REPORTED LUNS DATA CHANGED (sess %p)", sess);
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct list_head *shead;
+ struct scst_tgt_dev *tgt_dev;
+
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry(tgt_dev, shead,
+ sess_tgt_dev_list_entry) {
+ if (scst_is_report_luns_changed_type(
+ tgt_dev->dev->type)) {
+ lun = tgt_dev->lun;
+ d_sense = tgt_dev->dev->d_sense;
+ goto found;
+ }
+ }
+ }
+
+found:
+ if (tgtt->report_aen != NULL) {
+ struct scst_aen *aen;
+ int rc;
+
+ aen = scst_alloc_aen(sess, lun);
+ if (aen == NULL)
+ goto queue_ua;
+
+ aen->event_fn = SCST_AEN_SCSI;
+ aen->aen_sense_len = scst_set_sense(aen->aen_sense,
+ sizeof(aen->aen_sense), d_sense,
+ SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed));
+
+ TRACE_DBG("Calling target's %s report_aen(%p)",
+ tgtt->name, aen);
+ rc = tgtt->report_aen(aen);
+ TRACE_DBG("Target's %s report_aen(%p) returned %d",
+ tgtt->name, aen, rc);
+ if (rc == SCST_AEN_RES_SUCCESS)
+ goto out;
+
+ scst_free_aen(aen);
+ }
+
+queue_ua:
+ scst_queue_report_luns_changed_UA(sess, 0);
+
+out:
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+void scst_report_luns_changed(struct scst_acg *acg)
+{
+ struct scst_session *sess;
+
+ TRACE_MGMT_DBG("REPORTED LUNS DATA CHANGED (acg %s)", acg->acg_name);
+
+ list_for_each_entry(sess, &acg->acg_sess_list, acg_sess_list_entry) {
+ scst_report_luns_changed_sess(sess);
+ }
+ return;
+}
+
+/**
+ * scst_aen_done() - AEN processing done
+ *
+ * Notifies SCST that the driver has sent the AEN and it
+ * can be freed now. Don't forget to set the delivery status, if it
+ * isn't success, using scst_set_aen_delivery_status() before calling
+ * this function.
+ */
+void scst_aen_done(struct scst_aen *aen)
+{
+
+ TRACE_MGMT_DBG("AEN %p (fn %d) done (initiator %s)", aen,
+ aen->event_fn, aen->sess->initiator_name);
+
+ if (aen->delivery_status == SCST_AEN_RES_SUCCESS)
+ goto out_free;
+
+ if (aen->event_fn != SCST_AEN_SCSI)
+ goto out_free;
+
+ TRACE_MGMT_DBG("Delivery of SCSI AEN failed (initiator %s)",
+ aen->sess->initiator_name);
+
+ if (scst_analyze_sense(aen->aen_sense, aen->aen_sense_len,
+ SCST_SENSE_ALL_VALID, SCST_LOAD_SENSE(
+ scst_sense_reported_luns_data_changed))) {
+ mutex_lock(&scst_mutex);
+ scst_queue_report_luns_changed_UA(aen->sess,
+ SCST_SET_UA_FLAG_AT_HEAD);
+ mutex_unlock(&scst_mutex);
+ } else {
+ struct list_head *shead;
+ struct scst_tgt_dev *tgt_dev;
+ uint64_t lun;
+
+ lun = scst_unpack_lun((uint8_t *)&aen->lun, sizeof(aen->lun));
+
+ mutex_lock(&scst_mutex);
+
+ /* tgt_dev might get dead, so we need to reseek it */
+ shead = &aen->sess->sess_tgt_dev_list_hash[HASH_VAL(lun)];
+ list_for_each_entry(tgt_dev, shead,
+ sess_tgt_dev_list_entry) {
+ if (tgt_dev->lun == lun) {
+ TRACE_MGMT_DBG("Requeuing failed AEN UA for "
+ "tgt_dev %p", tgt_dev);
+ scst_check_set_UA(tgt_dev, aen->aen_sense,
+ aen->aen_sense_len,
+ SCST_SET_UA_FLAG_AT_HEAD);
+ break;
+ }
+ }
+
+ mutex_unlock(&scst_mutex);
+ }
+
+out_free:
+ scst_free_aen(aen);
+ return;
+}
+EXPORT_SYMBOL(scst_aen_done);
+
+void scst_requeue_ua(struct scst_cmd *cmd)
+{
+
+ if (scst_analyze_sense(cmd->sense, cmd->sense_valid_len,
+ SCST_SENSE_ALL_VALID,
+ SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed))) {
+ TRACE_MGMT_DBG("Requeuing REPORTED LUNS DATA CHANGED UA "
+ "for delivery failed cmd %p", cmd);
+ mutex_lock(&scst_mutex);
+ scst_queue_report_luns_changed_UA(cmd->sess,
+ SCST_SET_UA_FLAG_AT_HEAD);
+ mutex_unlock(&scst_mutex);
+ } else {
+ TRACE_MGMT_DBG("Requeuing UA for delivery failed cmd %p", cmd);
+ scst_check_set_UA(cmd->tgt_dev, cmd->sense,
+ cmd->sense_valid_len, SCST_SET_UA_FLAG_AT_HEAD);
+ }
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+static void scst_check_reassign_sess(struct scst_session *sess)
+{
+ struct scst_acg *acg, *old_acg;
+ struct scst_acg_dev *acg_dev;
+ int i;
+ struct list_head *shead;
+ struct scst_tgt_dev *tgt_dev;
+ bool luns_changed = false;
+ bool add_failed, something_freed, not_needed_freed = false;
+
+ TRACE_MGMT_DBG("Checking reassignment for sess %p (initiator %s)",
+ sess, sess->initiator_name);
+
+ acg = scst_find_acg(sess);
+ if (acg == sess->acg) {
+ TRACE_MGMT_DBG("No reassignment for sess %p", sess);
+ goto out;
+ }
+
+ TRACE_MGMT_DBG("sess %p will be reassigned from acg %s to acg %s",
+ sess, sess->acg->acg_name, acg->acg_name);
+
+ old_acg = sess->acg;
+ sess->acg = NULL; /* to catch implicit dependencies earlier */
+
+retry_add:
+ add_failed = false;
+ list_for_each_entry(acg_dev, &acg->acg_dev_list, acg_dev_list_entry) {
+ unsigned int inq_changed_ua_needed = 0;
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry(tgt_dev, shead,
+ sess_tgt_dev_list_entry) {
+ if ((tgt_dev->dev == acg_dev->dev) &&
+ (tgt_dev->lun == acg_dev->lun) &&
+ (tgt_dev->acg_dev->rd_only == acg_dev->rd_only)) {
+ TRACE_MGMT_DBG("sess %p: tgt_dev %p for "
+ "LUN %lld stays the same",
+ sess, tgt_dev,
+ (unsigned long long)tgt_dev->lun);
+ tgt_dev->acg_dev = acg_dev;
+ goto next;
+ } else if (tgt_dev->lun == acg_dev->lun)
+ inq_changed_ua_needed = 1;
+ }
+ }
+
+ luns_changed = true;
+
+ TRACE_MGMT_DBG("sess %p: Allocing new tgt_dev for LUN %lld",
+ sess, (unsigned long long)acg_dev->lun);
+
+ tgt_dev = scst_alloc_add_tgt_dev(sess, acg_dev);
+ if (tgt_dev == NULL) {
+ add_failed = true;
+ break;
+ }
+
+ tgt_dev->inq_changed_ua_needed = inq_changed_ua_needed ||
+ not_needed_freed;
+next:
+ continue;
+ }
+
+ something_freed = false;
+ not_needed_freed = true;
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct scst_tgt_dev *t;
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry_safe(tgt_dev, t, shead,
+ sess_tgt_dev_list_entry) {
+ if (tgt_dev->acg_dev->acg != acg) {
+ TRACE_MGMT_DBG("sess %p: Deleting not used "
+ "tgt_dev %p for LUN %lld",
+ sess, tgt_dev,
+ (unsigned long long)tgt_dev->lun);
+ luns_changed = true;
+ something_freed = true;
+ scst_free_tgt_dev(tgt_dev);
+ }
+ }
+ }
+
+ if (add_failed && something_freed) {
+ TRACE_MGMT_DBG("sess %p: Retrying adding new tgt_devs", sess);
+ goto retry_add;
+ }
+
+ sess->acg = acg;
+
+ TRACE_DBG("Moving sess %p from acg %s to acg %s", sess,
+ old_acg->acg_name, acg->acg_name);
+ list_move_tail(&sess->acg_sess_list_entry, &acg->acg_sess_list);
+
+ if (luns_changed) {
+ scst_report_luns_changed_sess(sess);
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ shead = &sess->sess_tgt_dev_list_hash[i];
+
+ list_for_each_entry(tgt_dev, shead,
+ sess_tgt_dev_list_entry) {
+ if (tgt_dev->inq_changed_ua_needed) {
+ TRACE_MGMT_DBG("sess %p: Setting "
+ "INQUIRY DATA HAS CHANGED UA "
+ "(tgt_dev %p)", sess, tgt_dev);
+
+ tgt_dev->inq_changed_ua_needed = 0;
+
+ scst_gen_aen_or_ua(tgt_dev,
+ SCST_LOAD_SENSE(scst_sense_inquery_data_changed));
+ }
+ }
+ }
+ }
+
+out:
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+void scst_check_reassign_sessions(void)
+{
+ struct scst_tgt_template *tgtt;
+
+ list_for_each_entry(tgtt, &scst_template_list, scst_template_list_entry) {
+ struct scst_tgt *tgt;
+ list_for_each_entry(tgt, &tgtt->tgt_list, tgt_list_entry) {
+ struct scst_session *sess;
+ list_for_each_entry(sess, &tgt->sess_list,
+ sess_list_entry) {
+ scst_check_reassign_sess(sess);
+ }
+ }
+ }
+ return;
+}
+
+/**
+ * scst_get_cmd_abnormal_done_state() - get command's next abnormal done state
+ *
+ * Returns the next state of the SCSI target state machine in case if command's
+ * completed abnormally.
+ */
+int scst_get_cmd_abnormal_done_state(const struct scst_cmd *cmd)
+{
+ int res;
+
+ switch (cmd->state) {
+ case SCST_CMD_STATE_INIT_WAIT:
+ case SCST_CMD_STATE_INIT:
+ case SCST_CMD_STATE_PRE_PARSE:
+ case SCST_CMD_STATE_DEV_PARSE:
+ if (cmd->preprocessing_only) {
+ res = SCST_CMD_STATE_PREPROCESSING_DONE;
+ break;
+ } /* else go through */
+ case SCST_CMD_STATE_DEV_DONE:
+ if (cmd->internal)
+ res = SCST_CMD_STATE_FINISHED_INTERNAL;
+ else
+ res = SCST_CMD_STATE_PRE_XMIT_RESP;
+ break;
+
+ case SCST_CMD_STATE_PRE_DEV_DONE:
+ case SCST_CMD_STATE_MODE_SELECT_CHECKS:
+ res = SCST_CMD_STATE_DEV_DONE;
+ break;
+
+ case SCST_CMD_STATE_PRE_XMIT_RESP:
+ res = SCST_CMD_STATE_XMIT_RESP;
+ break;
+
+ case SCST_CMD_STATE_PREPROCESSING_DONE:
+ case SCST_CMD_STATE_PREPROCESSING_DONE_CALLED:
+ if (cmd->tgt_dev == NULL)
+ res = SCST_CMD_STATE_PRE_XMIT_RESP;
+ else
+ res = SCST_CMD_STATE_PRE_DEV_DONE;
+ break;
+
+ case SCST_CMD_STATE_PREPARE_SPACE:
+ if (cmd->preprocessing_only) {
+ res = SCST_CMD_STATE_PREPROCESSING_DONE;
+ break;
+ } /* else go through */
+ case SCST_CMD_STATE_RDY_TO_XFER:
+ case SCST_CMD_STATE_DATA_WAIT:
+ case SCST_CMD_STATE_TGT_PRE_EXEC:
+ case SCST_CMD_STATE_SEND_FOR_EXEC:
+ case SCST_CMD_STATE_LOCAL_EXEC:
+ case SCST_CMD_STATE_REAL_EXEC:
+ case SCST_CMD_STATE_REAL_EXECUTING:
+ res = SCST_CMD_STATE_PRE_DEV_DONE;
+ break;
+
+ default:
+ PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %x)",
+ cmd->state, cmd, cmd->cdb[0]);
+ BUG();
+ /* Invalid state to supress compiler's warning */
+ res = SCST_CMD_STATE_LAST_ACTIVE;
+ }
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_get_cmd_abnormal_done_state);
+
+/**
+ * scst_set_cmd_abnormal_done_state() - set command's next abnormal done state
+ *
+ * Sets state of the SCSI target state machine in case if command's completed
+ * abnormally.
+ */
+void scst_set_cmd_abnormal_done_state(struct scst_cmd *cmd)
+{
+
+#ifdef CONFIG_SCST_EXTRACHECKS
+ switch (cmd->state) {
+ case SCST_CMD_STATE_XMIT_RESP:
+ case SCST_CMD_STATE_FINISHED:
+ case SCST_CMD_STATE_FINISHED_INTERNAL:
+ case SCST_CMD_STATE_XMIT_WAIT:
+ PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %x)",
+ cmd->state, cmd, cmd->cdb[0]);
+ BUG();
+ }
+#endif
+
+ cmd->state = scst_get_cmd_abnormal_done_state(cmd);
+
+#ifdef CONFIG_SCST_EXTRACHECKS
+ if (((cmd->state != SCST_CMD_STATE_PRE_XMIT_RESP) &&
+ (cmd->state != SCST_CMD_STATE_PREPROCESSING_DONE)) &&
+ (cmd->tgt_dev == NULL) && !cmd->internal) {
+ PRINT_CRIT_ERROR("Wrong not inited cmd state %d (cmd %p, "
+ "op %x)", cmd->state, cmd, cmd->cdb[0]);
+ BUG();
+ }
+#endif
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_set_cmd_abnormal_done_state);
+
+/**
+ * scst_set_resp_data_len() - set response data length
+ *
+ * Sets response data length for cmd and truncates its SG vector accordingly.
+ *
+ * The cmd->resp_data_len must not be set directly, it must be set only
+ * using this function. Value of resp_data_len must be <= cmd->bufflen.
+ */
+void scst_set_resp_data_len(struct scst_cmd *cmd, int resp_data_len)
+{
+ int i, l;
+
+ scst_check_restore_sg_buff(cmd);
+ cmd->resp_data_len = resp_data_len;
+
+ if (resp_data_len == cmd->bufflen)
+ goto out;
+
+ l = 0;
+ for (i = 0; i < cmd->sg_cnt; i++) {
+ l += cmd->sg[i].length;
+ if (l >= resp_data_len) {
+ int left = resp_data_len - (l - cmd->sg[i].length);
+#ifdef CONFIG_SCST_DEBUG
+ TRACE(TRACE_SG_OP|TRACE_MEMORY, "cmd %p (tag %llu), "
+ "resp_data_len %d, i %d, cmd->sg[i].length %d, "
+ "left %d",
+ cmd, (long long unsigned int)cmd->tag,
+ resp_data_len, i,
+ cmd->sg[i].length, left);
+#endif
+ cmd->orig_sg_cnt = cmd->sg_cnt;
+ cmd->orig_sg_entry = i;
+ cmd->orig_entry_len = cmd->sg[i].length;
+ cmd->sg_cnt = (left > 0) ? i+1 : i;
+ cmd->sg[i].length = left;
+ cmd->sg_buff_modified = 1;
+ break;
+ }
+ }
+
+out:
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_set_resp_data_len);
+
+/* No locks */
+int scst_queue_retry_cmd(struct scst_cmd *cmd, int finished_cmds)
+{
+ struct scst_tgt *tgt = cmd->tgt;
+ int res = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgt->tgt_lock, flags);
+ tgt->retry_cmds++;
+ /*
+ * Memory barrier is needed here, because we need the exact order
+ * between the read and write between retry_cmds and finished_cmds to
+ * not miss the case when a command finished while we queuing it for
+ * retry after the finished_cmds check.
+ */
+ smp_mb();
+ TRACE_RETRY("TGT QUEUE FULL: incrementing retry_cmds %d",
+ tgt->retry_cmds);
+ if (finished_cmds != atomic_read(&tgt->finished_cmds)) {
+ /* At least one cmd finished, so try again */
+ tgt->retry_cmds--;
+ TRACE_RETRY("Some command(s) finished, direct retry "
+ "(finished_cmds=%d, tgt->finished_cmds=%d, "
+ "retry_cmds=%d)", finished_cmds,
+ atomic_read(&tgt->finished_cmds), tgt->retry_cmds);
+ res = -1;
+ goto out_unlock_tgt;
+ }
+
+ TRACE_RETRY("Adding cmd %p to retry cmd list", cmd);
+ list_add_tail(&cmd->cmd_list_entry, &tgt->retry_cmd_list);
+
+ if (!tgt->retry_timer_active) {
+ tgt->retry_timer.expires = jiffies + SCST_TGT_RETRY_TIMEOUT;
+ add_timer(&tgt->retry_timer);
+ tgt->retry_timer_active = 1;
+ }
+
+out_unlock_tgt:
+ spin_unlock_irqrestore(&tgt->tgt_lock, flags);
+ return res;
+}
+
+/* Returns 0 to continue, >0 to restart, <0 to break */
+static int scst_check_hw_pending_cmd(struct scst_cmd *cmd,
+ unsigned long cur_time, unsigned long max_time,
+ struct scst_session *sess, unsigned long *flags,
+ struct scst_tgt_template *tgtt)
+{
+ int res = -1; /* break */
+
+ TRACE_DBG("cmd %p, hw_pending %d, proc time %ld, "
+ "pending time %ld", cmd, cmd->cmd_hw_pending,
+ (long)(cur_time - cmd->start_time) / HZ,
+ (long)(cur_time - cmd->hw_pending_start) / HZ);
+
+ if (time_before_eq(cur_time, cmd->start_time + max_time)) {
+ /* Cmds are ordered, so no need to check more */
+ goto out;
+ }
+
+ if (!cmd->cmd_hw_pending) {
+ res = 0; /* continue */
+ goto out;
+ }
+
+ if (time_before(cur_time, cmd->hw_pending_start + max_time)) {
+ /* Cmds are ordered, so no need to check more */
+ goto out;
+ }
+
+ TRACE_MGMT_DBG("Cmd %p HW pending for too long %ld (state %x)",
+ cmd, (cur_time - cmd->hw_pending_start) / HZ,
+ cmd->state);
+
+ cmd->cmd_hw_pending = 0;
+
+ spin_unlock_irqrestore(&sess->sess_list_lock, *flags);
+ tgtt->on_hw_pending_cmd_timeout(cmd);
+ spin_lock_irqsave(&sess->sess_list_lock, *flags);
+
+ res = 1; /* restart */
+
+out:
+ return res;
+}
+
+static void scst_hw_pending_work_fn(struct delayed_work *work)
+{
+ struct scst_session *sess = container_of(work, struct scst_session,
+ hw_pending_work);
+ struct scst_tgt_template *tgtt = sess->tgt->tgtt;
+ struct scst_cmd *cmd;
+ unsigned long cur_time = jiffies;
+ unsigned long flags;
+ unsigned long max_time = tgtt->max_hw_pending_time * HZ;
+
+ TRACE_DBG("HW pending work (sess %p, max time %ld)", sess, max_time/HZ);
+
+ clear_bit(SCST_SESS_HW_PENDING_WORK_SCHEDULED, &sess->sess_aflags);
+
+ spin_lock_irqsave(&sess->sess_list_lock, flags);
+
+restart:
+ list_for_each_entry(cmd, &sess->sess_cmd_list, sess_cmd_list_entry) {
+ int rc;
+
+ rc = scst_check_hw_pending_cmd(cmd, cur_time, max_time, sess,
+ &flags, tgtt);
+ if (rc < 0)
+ break;
+ else if (rc == 0)
+ continue;
+ else
+ goto restart;
+ }
+
+ if (!list_empty(&sess->sess_cmd_list)) {
+ /*
+ * For stuck cmds if there is no activity we might need to have
+ * one more run to release them, so reschedule once again.
+ */
+ TRACE_DBG("Sched HW pending work for sess %p (max time %d)",
+ sess, tgtt->max_hw_pending_time);
+ set_bit(SCST_SESS_HW_PENDING_WORK_SCHEDULED, &sess->sess_aflags);
+ schedule_delayed_work(&sess->hw_pending_work,
+ tgtt->max_hw_pending_time * HZ);
+ }
+
+ spin_unlock_irqrestore(&sess->sess_list_lock, flags);
+ return;
+}
+
+bool scst_is_relative_target_port_id_unique(uint16_t id, struct scst_tgt *t)
+{
+ bool res = true;
+ struct scst_tgt_template *tgtt;
+
+ mutex_lock(&scst_mutex);
+ list_for_each_entry(tgtt, &scst_template_list,
+ scst_template_list_entry) {
+ struct scst_tgt *tgt;
+ list_for_each_entry(tgt, &tgtt->tgt_list, tgt_list_entry) {
+ if (tgt == t)
+ continue;
+ if (id == tgt->rel_tgt_id) {
+ res = false;
+ break;
+ }
+ }
+ }
+ mutex_unlock(&scst_mutex);
+ return res;
+}
+
+int gen_relative_target_port_id(uint16_t *id)
+{
+ int res = -EOVERFLOW;
+ static unsigned long rti = SCST_MIN_REL_TGT_ID, rti_prev;
+
+ rti_prev = rti;
+ do {
+ if (scst_is_relative_target_port_id_unique(rti, NULL)) {
+ *id = (uint16_t)rti++;
+ res = 0;
+ goto out;
+ }
+ rti++;
+ if (rti > SCST_MAX_REL_TGT_ID)
+ rti = SCST_MIN_REL_TGT_ID;
+ } while (rti != rti_prev);
+
+ PRINT_ERROR("%s", "Unable to create unique relative target port id");
+
+out:
+ return res;
+}
+
+int scst_alloc_tgt(struct scst_tgt_template *tgtt, struct scst_tgt **tgt)
+{
+ struct scst_tgt *t;
+ int res = 0;
+
+ t = kzalloc(sizeof(*t), GFP_KERNEL);
+ if (t == NULL) {
+ TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of tgt failed");
+ res = -ENOMEM;
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&t->sess_list);
+ init_waitqueue_head(&t->unreg_waitQ);
+ t->tgtt = tgtt;
+ t->sg_tablesize = tgtt->sg_tablesize;
+ spin_lock_init(&t->tgt_lock);
+ INIT_LIST_HEAD(&t->retry_cmd_list);
+ atomic_set(&t->finished_cmds, 0);
+ init_timer(&t->retry_timer);
+ t->retry_timer.data = (unsigned long)t;
+ t->retry_timer.function = scst_tgt_retry_timer_fn;
+
+ *tgt = t;
+
+out:
+ return res;
+}
+
+void scst_free_tgt(struct scst_tgt *tgt)
+{
+
+ if (tgt->default_acg != NULL)
+ scst_free_acg(tgt->default_acg);
+
+ kfree(tgt->tgt_name);
+
+ kfree(tgt);
+ return;
+}
+
+/* Called under scst_mutex and suspended activity */
+int scst_alloc_device(gfp_t gfp_mask, struct scst_device **out_dev)
+{
+ struct scst_device *dev;
+ int res = 0;
+
+ dev = kzalloc(sizeof(*dev), gfp_mask);
+ if (dev == NULL) {
+ TRACE(TRACE_OUT_OF_MEM, "%s",
+ "Allocation of scst_device failed");
+ res = -ENOMEM;
+ goto out;
+ }
+
+ dev->handler = &scst_null_devtype;
+ atomic_set(&dev->dev_cmd_count, 0);
+ atomic_set(&dev->write_cmd_count, 0);
+ scst_init_mem_lim(&dev->dev_mem_lim);
+ spin_lock_init(&dev->dev_lock);
+ atomic_set(&dev->on_dev_count, 0);
+ INIT_LIST_HEAD(&dev->blocked_cmd_list);
+ INIT_LIST_HEAD(&dev->dev_tgt_dev_list);
+ INIT_LIST_HEAD(&dev->dev_acg_dev_list);
+ init_waitqueue_head(&dev->on_dev_waitQ);
+ dev->dev_double_ua_possible = 1;
+ dev->queue_alg = SCST_CONTR_MODE_QUEUE_ALG_UNRESTRICTED_REORDER;
+
+ scst_init_threads(&dev->dev_cmd_threads);
+
+ *out_dev = dev;
+
+out:
+ return res;
+}
+
+void scst_free_device(struct scst_device *dev)
+{
+
+#ifdef CONFIG_SCST_EXTRACHECKS
+ if (!list_empty(&dev->dev_tgt_dev_list) ||
+ !list_empty(&dev->dev_acg_dev_list)) {
+ PRINT_CRIT_ERROR("%s: dev_tgt_dev_list or dev_acg_dev_list "
+ "is not empty!", __func__);
+ BUG();
+ }
+#endif
+
+ scst_deinit_threads(&dev->dev_cmd_threads);
+
+ kfree(dev->virt_name);
+ kfree(dev);
+ return;
+}
+
+/**
+ * scst_init_mem_lim - initialize memory limits structure
+ *
+ * Initializes memory limits structure mem_lim according to
+ * the current system configuration. This structure should be latter used
+ * to track and limit allocated by one or more SGV pools memory.
+ */
+void scst_init_mem_lim(struct scst_mem_lim *mem_lim)
+{
+ atomic_set(&mem_lim->alloced_pages, 0);
+ mem_lim->max_allowed_pages =
+ ((uint64_t)scst_max_dev_cmd_mem << 10) >> (PAGE_SHIFT - 10);
+}
+EXPORT_SYMBOL_GPL(scst_init_mem_lim);
+
+static struct scst_acg_dev *scst_alloc_acg_dev(struct scst_acg *acg,
+ struct scst_device *dev, uint64_t lun)
+{
+ struct scst_acg_dev *res;
+
+ res = kmem_cache_zalloc(scst_acgd_cachep, GFP_KERNEL);
+ if (res == NULL) {
+ TRACE(TRACE_OUT_OF_MEM,
+ "%s", "Allocation of scst_acg_dev failed");
+ goto out;
+ }
+
+ res->dev = dev;
+ res->acg = acg;
+ res->lun = lun;
+
+out:
+ return res;
+}
+
+void scst_acg_dev_destroy(struct scst_acg_dev *acg_dev)
+{
+
+ if ((acg_dev->dev != NULL) && acg_dev->dev->dev_kobj_initialized)
+ kobject_put(&acg_dev->dev->dev_kobj);
+
+ kmem_cache_free(scst_acgd_cachep, acg_dev);
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+static void scst_free_acg_dev(struct scst_acg_dev *acg_dev)
+{
+
+ TRACE_DBG("Removing acg_dev %p from acg_dev_list and dev_acg_dev_list",
+ acg_dev);
+ list_del(&acg_dev->acg_dev_list_entry);
+ list_del(&acg_dev->dev_acg_dev_list_entry);
+
+ if (acg_dev->acg_dev_kobj_initialized) {
+ kobject_del(&acg_dev->acg_dev_kobj);
+ kobject_put(&acg_dev->acg_dev_kobj);
+ } else
+ scst_acg_dev_destroy(acg_dev);
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+struct scst_acg *scst_alloc_add_acg(struct scst_tgt *tgt,
+ const char *acg_name)
+{
+ struct scst_acg *acg;
+
+ acg = kzalloc(sizeof(*acg), GFP_KERNEL);
+ if (acg == NULL) {
+ PRINT_ERROR("%s", "Allocation of acg failed");
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&acg->acg_dev_list);
+ INIT_LIST_HEAD(&acg->acg_sess_list);
+ INIT_LIST_HEAD(&acg->acn_list);
+ acg->acg_name = kstrdup(acg_name, GFP_KERNEL);
+ if (acg->acg_name == NULL) {
+ PRINT_ERROR("%s", "Allocation of acg_name failed");
+ goto out_free;
+ }
+
+ acg->addr_method = SCST_LUN_ADDR_METHOD_PERIPHERAL;
+
+ if (tgt != NULL) {
+ TRACE_DBG("Adding acg '%s' to device '%s' acg_list", acg_name,
+ tgt->tgt_name);
+ list_add_tail(&acg->acg_list_entry, &tgt->tgt_acg_list);
+ acg->in_tgt_acg_list = 1;
+ }
+
+out:
+ return acg;
+
+out_free:
+ kfree(acg);
+ acg = NULL;
+ goto out;
+}
+
+void scst_free_acg(struct scst_acg *acg)
+{
+
+ BUG_ON(!list_empty(&acg->acg_sess_list));
+ BUG_ON(!list_empty(&acg->acg_dev_list));
+ BUG_ON(!list_empty(&acg->acn_list));
+
+ kfree(acg->acg_name);
+ kfree(acg);
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+void scst_clear_acg(struct scst_acg *acg)
+{
+ struct scst_acn *n, *nn;
+ struct scst_acg_dev *acg_dev, *acg_dev_tmp;
+
+ TRACE_DBG("Clearing acg %s from list", acg->acg_name);
+
+ BUG_ON(!list_empty(&acg->acg_sess_list));
+ if (acg->in_tgt_acg_list) {
+ TRACE_DBG("Removing acg %s from list", acg->acg_name);
+ list_del(&acg->acg_list_entry);
+ acg->in_tgt_acg_list = 0;
+ }
+ /* Freeing acg_devs */
+ list_for_each_entry_safe(acg_dev, acg_dev_tmp, &acg->acg_dev_list,
+ acg_dev_list_entry) {
+ struct scst_tgt_dev *tgt_dev, *tt;
+ list_for_each_entry_safe(tgt_dev, tt,
+ &acg_dev->dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if (tgt_dev->acg_dev == acg_dev)
+ scst_free_tgt_dev(tgt_dev);
+ }
+ scst_free_acg_dev(acg_dev);
+ }
+
+ /* Freeing names */
+ list_for_each_entry_safe(n, nn, &acg->acn_list,
+ acn_list_entry) {
+ scst_acn_sysfs_del(acg, n,
+ list_is_last(&n->acn_list_entry, &acg->acn_list));
+ }
+ INIT_LIST_HEAD(&acg->acn_list);
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+void scst_destroy_acg(struct scst_acg *acg)
+{
+
+ scst_clear_acg(acg);
+ scst_free_acg(acg);
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+struct scst_acg *scst_tgt_find_acg(struct scst_tgt *tgt, const char *name)
+{
+ struct scst_acg *acg, *acg_ret = NULL;
+
+ list_for_each_entry(acg, &tgt->tgt_acg_list, acg_list_entry) {
+ if (strcmp(acg->acg_name, name) == 0) {
+ acg_ret = acg;
+ break;
+ }
+ }
+ return acg_ret;
+}
+
+/* scst_mutex supposed to be held */
+static struct scst_tgt_dev *scst_find_shared_io_tgt_dev(
+ struct scst_tgt_dev *tgt_dev)
+{
+ struct scst_tgt_dev *res = NULL;
+ struct scst_acg *acg = tgt_dev->acg_dev->acg;
+ struct scst_tgt_dev *t;
+
+ TRACE_DBG("tgt_dev %s (acg %p, io_grouping_type %d)",
+ tgt_dev->sess->initiator_name, acg, acg->acg_io_grouping_type);
+
+ switch (acg->acg_io_grouping_type) {
+ case SCST_IO_GROUPING_AUTO:
+ if (tgt_dev->sess->initiator_name == NULL)
+ goto out;
+
+ list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if ((t == tgt_dev) ||
+ (t->sess->initiator_name == NULL) ||
+ (t->active_cmd_threads == NULL))
+ continue;
+
+ TRACE_DBG("t %s", t->sess->initiator_name);
+
+ /* We check other ACG's as well */
+
+ if (strcmp(t->sess->initiator_name,
+ tgt_dev->sess->initiator_name) == 0)
+ goto found;
+ }
+ break;
+
+ case SCST_IO_GROUPING_THIS_GROUP_ONLY:
+ list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if ((t == tgt_dev) || (t->active_cmd_threads == NULL))
+ continue;
+
+ TRACE_DBG("t %s (acg %p)", t->sess->initiator_name,
+ t->acg_dev->acg);
+
+ if (t->acg_dev->acg == acg)
+ goto found;
+ }
+ break;
+
+ case SCST_IO_GROUPING_NEVER:
+ goto out;
+
+ default:
+ list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if ((t == tgt_dev) || (t->active_cmd_threads == NULL))
+ continue;
+
+ TRACE_DBG("t %s (acg %p, io_grouping_type %d)",
+ t->sess->initiator_name, t->acg_dev->acg,
+ t->acg_dev->acg->acg_io_grouping_type);
+
+ if (t->acg_dev->acg->acg_io_grouping_type ==
+ acg->acg_io_grouping_type)
+ goto found;
+ }
+ break;
+ }
+
+out:
+ return res;
+
+found:
+ if (t->active_cmd_threads == &scst_main_cmd_threads) {
+ res = t;
+ TRACE_MGMT_DBG("Going to share async IO context %p (res %p, "
+ "ini %s, dev %s, grouping type %d)",
+ t->aic_keeper->aic, res, t->sess->initiator_name,
+ t->dev->virt_name,
+ t->acg_dev->acg->acg_io_grouping_type);
+ } else {
+ res = t;
+ if (res->active_cmd_threads->io_context == NULL) {
+ TRACE_MGMT_DBG("IO context for t %p not yet "
+ "initialized, waiting...", t);
+ msleep(100);
+ barrier();
+ goto found;
+ }
+ TRACE_MGMT_DBG("Going to share IO context %p (res %p, ini %s, "
+ "dev %s, cmd_threads %p, grouping type %d)",
+ res->active_cmd_threads->io_context, res,
+ t->sess->initiator_name, t->dev->virt_name,
+ t->active_cmd_threads,
+ t->acg_dev->acg->acg_io_grouping_type);
+ }
+ goto out;
+}
+
+enum scst_dev_type_threads_pool_type scst_parse_threads_pool_type(const char *p,
+ int len)
+{
+ enum scst_dev_type_threads_pool_type res;
+
+ if (strncasecmp(p, SCST_THREADS_POOL_PER_INITIATOR_STR,
+ min_t(int, strlen(SCST_THREADS_POOL_PER_INITIATOR_STR),
+ len)) == 0)
+ res = SCST_THREADS_POOL_PER_INITIATOR;
+ else if (strncasecmp(p, SCST_THREADS_POOL_SHARED_STR,
+ min_t(int, strlen(SCST_THREADS_POOL_SHARED_STR),
+ len)) == 0)
+ res = SCST_THREADS_POOL_SHARED;
+ else {
+ PRINT_ERROR("Unknown threads pool type %s", p);
+ res = SCST_THREADS_POOL_TYPE_INVALID;
+ }
+
+ return res;
+}
+
+static int scst_ioc_keeper_thread(void *arg)
+{
+ struct scst_async_io_context_keeper *aic_keeper =
+ (struct scst_async_io_context_keeper *)arg;
+
+ TRACE_MGMT_DBG("AIC %p keeper thread %s (PID %d) started", aic_keeper,
+ current->comm, current->pid);
+
+ current->flags |= PF_NOFREEZE;
+
+ BUG_ON(aic_keeper->aic != NULL);
+
+ aic_keeper->aic = get_io_context(GFP_KERNEL, -1);
+ TRACE_MGMT_DBG("Alloced new async IO context %p (aic %p)",
+ aic_keeper->aic, aic_keeper);
+
+ /* We have our own ref counting */
+ put_io_context(aic_keeper->aic);
+
+ /* We are ready */
+ wake_up_all(&aic_keeper->aic_keeper_waitQ);
+
+ wait_event_interruptible(aic_keeper->aic_keeper_waitQ,
+ kthread_should_stop());
+
+ TRACE_MGMT_DBG("AIC %p keeper thread %s (PID %d) finished", aic_keeper,
+ current->comm, current->pid);
+ return 0;
+}
+
+/* scst_mutex supposed to be held */
+int scst_tgt_dev_setup_threads(struct scst_tgt_dev *tgt_dev)
+{
+ int res = 0;
+ struct scst_device *dev = tgt_dev->dev;
+ struct scst_async_io_context_keeper *aic_keeper;
+
+ if (dev->threads_num <= 0) {
+ tgt_dev->active_cmd_threads = &scst_main_cmd_threads;
+
+ if (dev->threads_num == 0) {
+ struct scst_tgt_dev *shared_io_tgt_dev;
+
+ shared_io_tgt_dev = scst_find_shared_io_tgt_dev(tgt_dev);
+ if (shared_io_tgt_dev != NULL) {
+ aic_keeper = shared_io_tgt_dev->aic_keeper;
+ kref_get(&aic_keeper->aic_keeper_kref);
+
+ TRACE_MGMT_DBG("Linking async io context %p "
+ "for shared tgt_dev %p (dev %s)",
+ aic_keeper->aic, tgt_dev,
+ tgt_dev->dev->virt_name);
+ } else {
+ /* Create new context */
+ aic_keeper = kzalloc(sizeof(*aic_keeper),
+ GFP_KERNEL);
+ if (aic_keeper == NULL) {
+ PRINT_ERROR("Unable to alloc aic_keeper "
+ "(size %zd)", sizeof(*aic_keeper));
+ res = -ENOMEM;
+ goto out;
+ }
+
+ kref_init(&aic_keeper->aic_keeper_kref);
+ init_waitqueue_head(&aic_keeper->aic_keeper_waitQ);
+
+ aic_keeper->aic_keeper_thr =
+ kthread_run(scst_ioc_keeper_thread,
+ aic_keeper, "aic_keeper");
+ if (IS_ERR(aic_keeper->aic_keeper_thr)) {
+ PRINT_ERROR("Error running ioc_keeper "
+ "thread (tgt_dev %p)", tgt_dev);
+ res = PTR_ERR(aic_keeper->aic_keeper_thr);
+ goto out_free_keeper;
+ }
+
+ wait_event(aic_keeper->aic_keeper_waitQ,
+ aic_keeper->aic != NULL);
+
+ TRACE_MGMT_DBG("Created async io context %p "
+ "for not shared tgt_dev %p (dev %s)",
+ aic_keeper->aic, tgt_dev,
+ tgt_dev->dev->virt_name);
+ }
+
+ tgt_dev->async_io_context = aic_keeper->aic;
+ tgt_dev->aic_keeper = aic_keeper;
+ }
+
+ res = scst_add_threads(tgt_dev->active_cmd_threads, NULL, NULL,
+ tgt_dev->sess->tgt->tgtt->threads_num);
+ goto out;
+ }
+
+ switch (dev->threads_pool_type) {
+ case SCST_THREADS_POOL_PER_INITIATOR:
+ {
+ struct scst_tgt_dev *shared_io_tgt_dev;
+
+ scst_init_threads(&tgt_dev->tgt_dev_cmd_threads);
+
+ tgt_dev->active_cmd_threads = &tgt_dev->tgt_dev_cmd_threads;
+
+ shared_io_tgt_dev = scst_find_shared_io_tgt_dev(tgt_dev);
+ if (shared_io_tgt_dev != NULL) {
+ TRACE_MGMT_DBG("Linking io context %p for "
+ "shared tgt_dev %p (cmd_threads %p)",
+ shared_io_tgt_dev->active_cmd_threads->io_context,
+ tgt_dev, tgt_dev->active_cmd_threads);
+ /* It's ref counted via threads */
+ tgt_dev->active_cmd_threads->io_context =
+ shared_io_tgt_dev->active_cmd_threads->io_context;
+ }
+
+ res = scst_add_threads(tgt_dev->active_cmd_threads, NULL,
+ tgt_dev,
+ dev->threads_num + tgt_dev->sess->tgt->tgtt->threads_num);
+ if (res != 0) {
+ /* Let's clear here, because no threads could be run */
+ tgt_dev->active_cmd_threads->io_context = NULL;
+ }
+ break;
+ }
+ case SCST_THREADS_POOL_SHARED:
+ tgt_dev->active_cmd_threads = &dev->dev_cmd_threads;
+
+ res = scst_add_threads(tgt_dev->active_cmd_threads, dev, NULL,
+ tgt_dev->sess->tgt->tgtt->threads_num);
+ break;
+ default:
+ PRINT_CRIT_ERROR("Unknown threads pool type %d (dev %s)",
+ dev->threads_pool_type, dev->virt_name);
+ BUG();
+ break;
+ }
+
+out:
+ if (res == 0)
+ tm_dbg_init_tgt_dev(tgt_dev);
+ return res;
+
+out_free_keeper:
+ kfree(aic_keeper);
+ goto out;
+}
+
+static void scst_aic_keeper_release(struct kref *kref)
+{
+ struct scst_async_io_context_keeper *aic_keeper;
+
+ aic_keeper = container_of(kref, struct scst_async_io_context_keeper,
+ aic_keeper_kref);
+
+ kthread_stop(aic_keeper->aic_keeper_thr);
+
+ kfree(aic_keeper);
+ return;
+}
+
+/* scst_mutex supposed to be held */
+void scst_tgt_dev_stop_threads(struct scst_tgt_dev *tgt_dev)
+{
+
+ if (tgt_dev->active_cmd_threads == &scst_main_cmd_threads) {
+ /* Global async threads */
+ kref_put(&tgt_dev->aic_keeper->aic_keeper_kref,
+ scst_aic_keeper_release);
+ tgt_dev->async_io_context = NULL;
+ tgt_dev->aic_keeper = NULL;
+ } else if (tgt_dev->active_cmd_threads == &tgt_dev->dev->dev_cmd_threads) {
+ /* Per device shared threads */
+ scst_del_threads(tgt_dev->active_cmd_threads,
+ tgt_dev->sess->tgt->tgtt->threads_num);
+ } else if (tgt_dev->active_cmd_threads == &tgt_dev->tgt_dev_cmd_threads) {
+ /* Per tgt_dev threads */
+ scst_del_threads(tgt_dev->active_cmd_threads, -1);
+ scst_deinit_threads(&tgt_dev->tgt_dev_cmd_threads);
+ } /* else no threads (not yet initialized, e.g.) */
+
+ tm_dbg_deinit_tgt_dev(tgt_dev);
+ tgt_dev->active_cmd_threads = NULL;
+ return;
+}
+
+/*
+ * scst_mutex supposed to be held, there must not be parallel activity in this
+ * session.
+ */
+static struct scst_tgt_dev *scst_alloc_add_tgt_dev(struct scst_session *sess,
+ struct scst_acg_dev *acg_dev)
+{
+ int ini_sg, ini_unchecked_isa_dma, ini_use_clustering;
+ struct scst_tgt_dev *tgt_dev;
+ struct scst_device *dev = acg_dev->dev;
+ struct list_head *sess_tgt_dev_list_head;
+ int rc, i, sl;
+ uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
+
+ tgt_dev = kmem_cache_zalloc(scst_tgtd_cachep, GFP_KERNEL);
+ if (tgt_dev == NULL) {
+ TRACE(TRACE_OUT_OF_MEM, "%s",
+ "Allocation of scst_tgt_dev failed");
+ goto out;
+ }
+
+ tgt_dev->dev = dev;
+ tgt_dev->lun = acg_dev->lun;
+ tgt_dev->acg_dev = acg_dev;
+ tgt_dev->sess = sess;
+ atomic_set(&tgt_dev->tgt_dev_cmd_count, 0);
+
+ scst_sgv_pool_use_norm(tgt_dev);
+
+ if (dev->scsi_dev != NULL) {
+ ini_sg = dev->scsi_dev->host->sg_tablesize;
+ ini_unchecked_isa_dma = dev->scsi_dev->host->unchecked_isa_dma;
+ ini_use_clustering = (dev->scsi_dev->host->use_clustering ==
+ ENABLE_CLUSTERING);
+ } else {
+ ini_sg = (1 << 15) /* infinite */;
+ ini_unchecked_isa_dma = 0;
+ ini_use_clustering = 0;
+ }
+ tgt_dev->max_sg_cnt = min(ini_sg, sess->tgt->sg_tablesize);
+
+ if ((sess->tgt->tgtt->use_clustering || ini_use_clustering) &&
+ !sess->tgt->tgtt->no_clustering)
+ scst_sgv_pool_use_norm_clust(tgt_dev);
+
+ if (sess->tgt->tgtt->unchecked_isa_dma || ini_unchecked_isa_dma)
+ scst_sgv_pool_use_dma(tgt_dev);
+
+ TRACE_MGMT_DBG("Device %s on SCST lun=%lld",
+ dev->virt_name, (long long unsigned int)tgt_dev->lun);
+
+ spin_lock_init(&tgt_dev->tgt_dev_lock);
+ INIT_LIST_HEAD(&tgt_dev->UA_list);
+ spin_lock_init(&tgt_dev->thr_data_lock);
+ INIT_LIST_HEAD(&tgt_dev->thr_data_list);
+ spin_lock_init(&tgt_dev->sn_lock);
+ INIT_LIST_HEAD(&tgt_dev->deferred_cmd_list);
+ INIT_LIST_HEAD(&tgt_dev->skipped_sn_list);
+ tgt_dev->curr_sn = (typeof(tgt_dev->curr_sn))(-300);
+ tgt_dev->expected_sn = tgt_dev->curr_sn + 1;
+ tgt_dev->num_free_sn_slots = ARRAY_SIZE(tgt_dev->sn_slots)-1;
+ tgt_dev->cur_sn_slot = &tgt_dev->sn_slots[0];
+ for (i = 0; i < (int)ARRAY_SIZE(tgt_dev->sn_slots); i++)
+ atomic_set(&tgt_dev->sn_slots[i], 0);
+
+ if (dev->handler->parse_atomic &&
+ (sess->tgt->tgtt->preprocessing_done == NULL)) {
+ if (sess->tgt->tgtt->rdy_to_xfer_atomic)
+ __set_bit(SCST_TGT_DEV_AFTER_INIT_WR_ATOMIC,
+ &tgt_dev->tgt_dev_flags);
+ if (dev->handler->exec_atomic)
+ __set_bit(SCST_TGT_DEV_AFTER_INIT_OTH_ATOMIC,
+ &tgt_dev->tgt_dev_flags);
+ }
+ if (dev->handler->exec_atomic) {
+ if (sess->tgt->tgtt->rdy_to_xfer_atomic)
+ __set_bit(SCST_TGT_DEV_AFTER_RESTART_WR_ATOMIC,
+ &tgt_dev->tgt_dev_flags);
+ __set_bit(SCST_TGT_DEV_AFTER_RESTART_OTH_ATOMIC,
+ &tgt_dev->tgt_dev_flags);
+ __set_bit(SCST_TGT_DEV_AFTER_RX_DATA_ATOMIC,
+ &tgt_dev->tgt_dev_flags);
+ }
+ if (dev->handler->dev_done_atomic &&
+ sess->tgt->tgtt->xmit_response_atomic) {
+ __set_bit(SCST_TGT_DEV_AFTER_EXEC_ATOMIC,
+ &tgt_dev->tgt_dev_flags);
+ }
+
+ sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
+ dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA));
+ scst_alloc_set_UA(tgt_dev, sense_buffer, sl, 0);
+
+ rc = scst_tgt_dev_setup_threads(tgt_dev);
+ if (rc != 0)
+ goto out_free;
+
+ if (dev->handler && dev->handler->attach_tgt) {
+ TRACE_DBG("Calling dev handler's attach_tgt(%p)", tgt_dev);
+ rc = dev->handler->attach_tgt(tgt_dev);
+ TRACE_DBG("%s", "Dev handler's attach_tgt() returned");
+ if (rc != 0) {
+ PRINT_ERROR("Device handler's %s attach_tgt() "
+ "failed: %d", dev->handler->name, rc);
+ goto out_stop_threads;
+ }
+ }
+
+ spin_lock_bh(&dev->dev_lock);
+ list_add_tail(&tgt_dev->dev_tgt_dev_list_entry, &dev->dev_tgt_dev_list);
+ if (dev->dev_reserved)
+ __set_bit(SCST_TGT_DEV_RESERVED, &tgt_dev->tgt_dev_flags);
+ spin_unlock_bh(&dev->dev_lock);
+
+ sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[HASH_VAL(tgt_dev->lun)];
+ list_add_tail(&tgt_dev->sess_tgt_dev_list_entry,
+ sess_tgt_dev_list_head);
+
+out:
+ return tgt_dev;
+
+out_stop_threads:
+ scst_tgt_dev_stop_threads(tgt_dev);
+
+out_free:
+ scst_free_all_UA(tgt_dev);
+
+ kmem_cache_free(scst_tgtd_cachep, tgt_dev);
+ tgt_dev = NULL;
+ goto out;
+}
+
+/* No locks supposed to be held, scst_mutex - held */
+void scst_nexus_loss(struct scst_tgt_dev *tgt_dev, bool queue_UA)
+{
+
+ scst_clear_reservation(tgt_dev);
+
+ /* With activity suspended the lock isn't needed, but let's be safe */
+ spin_lock_bh(&tgt_dev->tgt_dev_lock);
+ scst_free_all_UA(tgt_dev);
+ memset(tgt_dev->tgt_dev_sense, 0, sizeof(tgt_dev->tgt_dev_sense));
+ spin_unlock_bh(&tgt_dev->tgt_dev_lock);
+
+ if (queue_UA) {
+ uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
+ int sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
+ tgt_dev->dev->d_sense,
+ SCST_LOAD_SENSE(scst_sense_nexus_loss_UA));
+ scst_check_set_UA(tgt_dev, sense_buffer, sl, 0);
+ }
+ return;
+}
+
+/*
+ * scst_mutex supposed to be held, there must not be parallel activity in this
+ * session.
+ */
+static void scst_free_tgt_dev(struct scst_tgt_dev *tgt_dev)
+{
+ struct scst_device *dev = tgt_dev->dev;
+
+ spin_lock_bh(&dev->dev_lock);
+ list_del(&tgt_dev->dev_tgt_dev_list_entry);
+ spin_unlock_bh(&dev->dev_lock);
+
+ list_del(&tgt_dev->sess_tgt_dev_list_entry);
+
+ scst_clear_reservation(tgt_dev);
+ scst_free_all_UA(tgt_dev);
+
+ if (dev->handler && dev->handler->detach_tgt) {
+ TRACE_DBG("Calling dev handler's detach_tgt(%p)",
+ tgt_dev);
+ dev->handler->detach_tgt(tgt_dev);
+ TRACE_DBG("%s", "Dev handler's detach_tgt() returned");
+ }
+
+ scst_tgt_dev_stop_threads(tgt_dev);
+
+ BUG_ON(!list_empty(&tgt_dev->thr_data_list));
+
+ kmem_cache_free(scst_tgtd_cachep, tgt_dev);
+ return;
+}
+
+/* scst_mutex supposed to be held */
+int scst_sess_alloc_tgt_devs(struct scst_session *sess)
+{
+ int res = 0;
+ struct scst_acg_dev *acg_dev;
+ struct scst_tgt_dev *tgt_dev;
+
+ list_for_each_entry(acg_dev, &sess->acg->acg_dev_list,
+ acg_dev_list_entry) {
+ tgt_dev = scst_alloc_add_tgt_dev(sess, acg_dev);
+ if (tgt_dev == NULL) {
+ res = -ENOMEM;
+ goto out_free;
+ }
+ }
+
+out:
+ return res;
+
+out_free:
+ scst_sess_free_tgt_devs(sess);
+ goto out;
+}
+
+/*
+ * scst_mutex supposed to be held, there must not be parallel activity in this
+ * session.
+ */
+void scst_sess_free_tgt_devs(struct scst_session *sess)
+{
+ int i;
+ struct scst_tgt_dev *tgt_dev, *t;
+
+ /* The session is going down, no users, so no locks */
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[i];
+ list_for_each_entry_safe(tgt_dev, t, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ scst_free_tgt_dev(tgt_dev);
+ }
+ INIT_LIST_HEAD(sess_tgt_dev_list_head);
+ }
+ return;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+int scst_acg_add_dev(struct scst_acg *acg, struct scst_device *dev,
+ uint64_t lun, int read_only, bool gen_scst_report_luns_changed)
+{
+ int res = 0;
+ struct scst_acg_dev *acg_dev;
+ struct scst_tgt_dev *tgt_dev;
+ struct scst_session *sess;
+ LIST_HEAD(tmp_tgt_dev_list);
+
+ INIT_LIST_HEAD(&tmp_tgt_dev_list);
+
+ acg_dev = scst_alloc_acg_dev(acg, dev, lun);
+ if (acg_dev == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+ acg_dev->rd_only = read_only;
+
+ TRACE_DBG("Adding acg_dev %p to acg_dev_list and dev_acg_dev_list",
+ acg_dev);
+ list_add_tail(&acg_dev->acg_dev_list_entry, &acg->acg_dev_list);
+ list_add_tail(&acg_dev->dev_acg_dev_list_entry, &dev->dev_acg_dev_list);
+
+ list_for_each_entry(sess, &acg->acg_sess_list, acg_sess_list_entry) {
+ tgt_dev = scst_alloc_add_tgt_dev(sess, acg_dev);
+ if (tgt_dev == NULL) {
+ res = -ENOMEM;
+ goto out_free;
+ }
+ list_add_tail(&tgt_dev->extra_tgt_dev_list_entry,
+ &tmp_tgt_dev_list);
+ }
+
+ if (gen_scst_report_luns_changed)
+ scst_report_luns_changed(acg);
+
+ PRINT_INFO("Added device %s to group %s (LUN %lld, "
+ "rd_only %d)", dev->virt_name, acg->acg_name,
+ (long long unsigned int)lun, read_only);
+
+out:
+ return res;
+
+out_free:
+ list_for_each_entry(tgt_dev, &tmp_tgt_dev_list,
+ extra_tgt_dev_list_entry) {
+ scst_free_tgt_dev(tgt_dev);
+ }
+ scst_free_acg_dev(acg_dev);
+ goto out;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+int scst_acg_remove_dev(struct scst_acg *acg, struct scst_device *dev,
+ bool gen_scst_report_luns_changed)
+{
+ int res = 0;
+ struct scst_acg_dev *acg_dev = NULL, *a;
+ struct scst_tgt_dev *tgt_dev, *tt;
+
+ list_for_each_entry(a, &acg->acg_dev_list, acg_dev_list_entry) {
+ if (a->dev == dev) {
+ acg_dev = a;
+ break;
+ }
+ }
+
+ if (acg_dev == NULL) {
+ PRINT_ERROR("Device is not found in group %s", acg->acg_name);
+ res = -EINVAL;
+ goto out;
+ }
+
+ list_for_each_entry_safe(tgt_dev, tt, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if (tgt_dev->acg_dev == acg_dev)
+ scst_free_tgt_dev(tgt_dev);
+ }
+ scst_free_acg_dev(acg_dev);
+
+ if (gen_scst_report_luns_changed)
+ scst_report_luns_changed(acg);
+
+ PRINT_INFO("Removed device %s from group %s", dev->virt_name,
+ acg->acg_name);
+
+out:
+ return res;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+int scst_acg_add_name(struct scst_acg *acg, const char *name)
+{
+ int res = 0;
+ struct scst_acn *n;
+ int len;
+ char *nm;
+
+ list_for_each_entry(n, &acg->acn_list, acn_list_entry) {
+ if (strcmp(n->name, name) == 0) {
+ PRINT_ERROR("Name %s already exists in group %s",
+ name, acg->acg_name);
+ res = -EEXIST;
+ goto out;
+ }
+ }
+
+ n = kmalloc(sizeof(*n), GFP_KERNEL);
+ if (n == NULL) {
+ PRINT_ERROR("%s", "Unable to allocate scst_acn");
+ res = -ENOMEM;
+ goto out;
+ }
+
+ len = strlen(name);
+ nm = kmalloc(len + 1, GFP_KERNEL);
+ if (nm == NULL) {
+ PRINT_ERROR("%s", "Unable to allocate scst_acn->name");
+ res = -ENOMEM;
+ goto out_free;
+ }
+
+ strcpy(nm, name);
+ n->name = nm;
+
+ res = scst_create_acn_sysfs(acg, n);
+ if (res != 0)
+ goto out_free_nm;
+
+ list_add_tail(&n->acn_list_entry, &acg->acn_list);
+
+out:
+ if (res == 0) {
+ PRINT_INFO("Added name '%s' to group '%s'", name, acg->acg_name);
+ scst_check_reassign_sessions();
+ }
+ return res;
+
+out_free_nm:
+ kfree(nm);
+
+out_free:
+ kfree(n);
+ goto out;
+}
+
+/* The activity supposed to be suspended and scst_mutex held */
+struct scst_acn *scst_acg_find_name(struct scst_acg *acg, const char *name)
+{
+ struct scst_acn *n;
+
+ TRACE_DBG("Trying to find name '%s'", name);
+
+ list_for_each_entry(n, &acg->acn_list, acn_list_entry) {
+ if (strcmp(n->name, name) == 0) {
+ TRACE_DBG("%s", "Found");
+ goto out;
+ }
+ }
+ n = NULL;
+out:
+ return n;
+}
+
+/* scst_mutex supposed to be held */
+void scst_acg_remove_acn(struct scst_acn *acn)
+{
+
+ list_del(&acn->acn_list_entry);
+ kfree(acn->name);
+ kfree(acn);
+ return;
+}
+
+static struct scst_cmd *scst_create_prepare_internal_cmd(
+ struct scst_cmd *orig_cmd, int bufsize)
+{
+ struct scst_cmd *res;
+ gfp_t gfp_mask = scst_cmd_atomic(orig_cmd) ? GFP_ATOMIC : GFP_KERNEL;
+
+ res = scst_alloc_cmd(gfp_mask);
+ if (res == NULL)
+ goto out;
+
+ res->cmd_threads = orig_cmd->cmd_threads;
+ res->sess = orig_cmd->sess;
+ res->atomic = scst_cmd_atomic(orig_cmd);
+ res->internal = 1;
+ res->tgtt = orig_cmd->tgtt;
+ res->tgt = orig_cmd->tgt;
+ res->dev = orig_cmd->dev;
+ res->tgt_dev = orig_cmd->tgt_dev;
+ res->lun = orig_cmd->lun;
+ res->queue_type = SCST_CMD_QUEUE_HEAD_OF_QUEUE;
+ res->data_direction = SCST_DATA_UNKNOWN;
+ res->orig_cmd = orig_cmd;
+ res->bufflen = bufsize;
+
+ scst_sess_get(res->sess);
+ if (res->tgt_dev != NULL)
+ __scst_get(0);
+
+ res->state = SCST_CMD_STATE_PRE_PARSE;
+
+out:
+ return res;
+}
+
+int scst_prepare_request_sense(struct scst_cmd *orig_cmd)
+{
+ int res = 0;
+ static const uint8_t request_sense[6] = {
+ REQUEST_SENSE, 0, 0, 0, SCST_SENSE_BUFFERSIZE, 0
+ };
+ struct scst_cmd *rs_cmd;
+
+ if (orig_cmd->sense != NULL) {
+ TRACE_MEM("Releasing sense %p (orig_cmd %p)",
+ orig_cmd->sense, orig_cmd);
+ mempool_free(orig_cmd->sense, scst_sense_mempool);
+ orig_cmd->sense = NULL;
+ }
+
+ rs_cmd = scst_create_prepare_internal_cmd(orig_cmd,
+ SCST_SENSE_BUFFERSIZE);
+ if (rs_cmd == NULL)
+ goto out_error;
+
+ memcpy(rs_cmd->cdb, request_sense, sizeof(request_sense));
+ rs_cmd->cdb[1] |= scst_get_cmd_dev_d_sense(orig_cmd);
+ rs_cmd->cdb_len = sizeof(request_sense);
+ rs_cmd->data_direction = SCST_DATA_READ;
+ rs_cmd->expected_data_direction = rs_cmd->data_direction;
+ rs_cmd->expected_transfer_len = SCST_SENSE_BUFFERSIZE;
+ rs_cmd->expected_values_set = 1;
+
+ TRACE_MGMT_DBG("Adding REQUEST SENSE cmd %p to head of active "
+ "cmd list", rs_cmd);
+ spin_lock_irq(&rs_cmd->cmd_threads->cmd_list_lock);
+ list_add(&rs_cmd->cmd_list_entry, &rs_cmd->cmd_threads->active_cmd_list);
+ wake_up(&rs_cmd->cmd_threads->cmd_list_waitQ);
+ spin_unlock_irq(&rs_cmd->cmd_threads->cmd_list_lock);
+
+out:
+ return res;
+
+out_error:
+ res = -1;
+ goto out;
+}
+
+static void scst_complete_request_sense(struct scst_cmd *req_cmd)
+{
+ struct scst_cmd *orig_cmd = req_cmd->orig_cmd;
+ uint8_t *buf;
+ int len;
+
+ BUG_ON(orig_cmd == NULL);
+
+ len = scst_get_buf_first(req_cmd, &buf);
+
+ if (scsi_status_is_good(req_cmd->status) && (len > 0) &&
+ SCST_SENSE_VALID(buf) && (!SCST_NO_SENSE(buf))) {
+ PRINT_BUFF_FLAG(TRACE_SCSI, "REQUEST SENSE returned",
+ buf, len);
+ scst_alloc_set_sense(orig_cmd, scst_cmd_atomic(req_cmd), buf,
+ len);
+ } else {
+ PRINT_ERROR("%s", "Unable to get the sense via "
+ "REQUEST SENSE, returning HARDWARE ERROR");
+ scst_set_cmd_error(orig_cmd,
+ SCST_LOAD_SENSE(scst_sense_hardw_error));
+ }
+
+ if (len > 0)
+ scst_put_buf(req_cmd, buf);
+
+ TRACE_MGMT_DBG("Adding orig cmd %p to head of active "
+ "cmd list", orig_cmd);
+ spin_lock_irq(&orig_cmd->cmd_threads->cmd_list_lock);
+ list_add(&orig_cmd->cmd_list_entry, &orig_cmd->cmd_threads->active_cmd_list);
+ wake_up(&orig_cmd->cmd_threads->cmd_list_waitQ);
+ spin_unlock_irq(&orig_cmd->cmd_threads->cmd_list_lock);
+ return;
+}
+
+int scst_finish_internal_cmd(struct scst_cmd *cmd)
+{
+ int res;
+
+ BUG_ON(!cmd->internal);
+
+ if (cmd->cdb[0] == REQUEST_SENSE)
+ scst_complete_request_sense(cmd);
+
+ __scst_cmd_put(cmd);
+
+ res = SCST_CMD_STATE_RES_CONT_NEXT;
+ return res;
+}
+
+static void scst_send_release(struct scst_device *dev)
+{
+ struct scsi_device *scsi_dev;
+ unsigned char cdb[6];
+ uint8_t sense[SCSI_SENSE_BUFFERSIZE];
+ int rc, i;
+
+ if (dev->scsi_dev == NULL)
+ goto out;
+
+ scsi_dev = dev->scsi_dev;
+
+ for (i = 0; i < 5; i++) {
+ memset(cdb, 0, sizeof(cdb));
+ cdb[0] = RELEASE;
+ cdb[1] = (scsi_dev->scsi_level <= SCSI_2) ?
+ ((scsi_dev->lun << 5) & 0xe0) : 0;
+
+ memset(sense, 0, sizeof(sense));
+
+ TRACE(TRACE_DEBUG | TRACE_SCSI, "%s", "Sending RELEASE req to "
+ "SCSI mid-level");
+ rc = scsi_execute(scsi_dev, cdb, SCST_DATA_NONE, NULL, 0,
+ sense, 15, 0, 0
+ , NULL
+ );
+ TRACE_DBG("MODE_SENSE done: %x", rc);
+
+ if (scsi_status_is_good(rc)) {
+ break;
+ } else {
+ PRINT_ERROR("RELEASE failed: %d", rc);
+ PRINT_BUFFER("RELEASE sense", sense, sizeof(sense));
+ scst_check_internal_sense(dev, rc, sense,
+ sizeof(sense));
+ }
+ }
+
+out:
+ return;
+}
+
+/* scst_mutex supposed to be held */
+static void scst_clear_reservation(struct scst_tgt_dev *tgt_dev)
+{
+ struct scst_device *dev = tgt_dev->dev;
+ int release = 0;
+
+ spin_lock_bh(&dev->dev_lock);
+ if (dev->dev_reserved &&
+ !test_bit(SCST_TGT_DEV_RESERVED, &tgt_dev->tgt_dev_flags)) {
+ /* This is one who holds the reservation */
+ struct scst_tgt_dev *tgt_dev_tmp;
+ list_for_each_entry(tgt_dev_tmp, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ clear_bit(SCST_TGT_DEV_RESERVED,
+ &tgt_dev_tmp->tgt_dev_flags);
+ }
+ dev->dev_reserved = 0;
+ release = 1;
+ }
+ spin_unlock_bh(&dev->dev_lock);
+
+ if (release)
+ scst_send_release(dev);
+ return;
+}
+
+struct scst_session *scst_alloc_session(struct scst_tgt *tgt, gfp_t gfp_mask,
+ const char *initiator_name)
+{
+ struct scst_session *sess;
+ int i;
+ int len;
+ char *nm;
+
+ sess = kmem_cache_zalloc(scst_sess_cachep, gfp_mask);
+ if (sess == NULL) {
+ TRACE(TRACE_OUT_OF_MEM, "%s",
+ "Allocation of scst_session failed");
+ goto out;
+ }
+
+ sess->init_phase = SCST_SESS_IPH_INITING;
+ sess->shut_phase = SCST_SESS_SPH_READY;
+ atomic_set(&sess->refcnt, 0);
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[i];
+ INIT_LIST_HEAD(sess_tgt_dev_list_head);
+ }
+ spin_lock_init(&sess->sess_list_lock);
+ INIT_LIST_HEAD(&sess->sess_cmd_list);
+ sess->tgt = tgt;
+ INIT_LIST_HEAD(&sess->init_deferred_cmd_list);
+ INIT_LIST_HEAD(&sess->init_deferred_mcmd_list);
+ INIT_DELAYED_WORK(&sess->hw_pending_work,
+ (void (*)(struct work_struct *))scst_hw_pending_work_fn);
+
+#ifdef CONFIG_SCST_MEASURE_LATENCY
+ spin_lock_init(&sess->lat_lock);
+#endif
+
+ len = strlen(initiator_name);
+ nm = kmalloc(len + 1, gfp_mask);
+ if (nm == NULL) {
+ PRINT_ERROR("%s", "Unable to allocate sess->initiator_name");
+ goto out_free;
+ }
+
+ strcpy(nm, initiator_name);
+ sess->initiator_name = nm;
+
+out:
+ return sess;
+
+out_free:
+ kmem_cache_free(scst_sess_cachep, sess);
+ sess = NULL;
+ goto out;
+}
+
+void scst_free_session(struct scst_session *sess)
+{
+
+ mutex_lock(&scst_mutex);
+
+ TRACE_DBG("Removing sess %p from the list", sess);
+ list_del(&sess->sess_list_entry);
+ TRACE_DBG("Removing session %p from acg %s", sess, sess->acg->acg_name);
+ list_del(&sess->acg_sess_list_entry);
+
+ scst_sess_free_tgt_devs(sess);
+
+ /* Called under lock to protect from too early tgt release */
+ wake_up_all(&sess->tgt->unreg_waitQ);
+
+ mutex_unlock(&scst_mutex);
+
+ scst_sess_sysfs_put(sess); /* must not be called under scst_mutex */
+ return;
+}
+
+void scst_release_session(struct scst_session *sess)
+{
+
+ kfree(sess->initiator_name);
+ kmem_cache_free(scst_sess_cachep, sess);
+ return;
+}
+
+void scst_free_session_callback(struct scst_session *sess)
+{
+ struct completion *c;
+
+ TRACE_DBG("Freeing session %p", sess);
+
+ cancel_delayed_work_sync(&sess->hw_pending_work);
+
+ c = sess->shutdown_compl;
+
+ if (sess->unreg_done_fn) {
+ TRACE_DBG("Calling unreg_done_fn(%p)", sess);
+ sess->unreg_done_fn(sess);
+ TRACE_DBG("%s", "unreg_done_fn() returned");
+ }
+ scst_free_session(sess);
+
+ if (c)
+ complete_all(c);
+ return;
+}
+
+void scst_sched_session_free(struct scst_session *sess)
+{
+ unsigned long flags;
+
+ if (sess->shut_phase != SCST_SESS_SPH_SHUTDOWN) {
+ PRINT_CRIT_ERROR("session %p is going to shutdown with unknown "
+ "shut phase %lx", sess, sess->shut_phase);
+ BUG();
+ }
+
+ spin_lock_irqsave(&scst_mgmt_lock, flags);
+ TRACE_DBG("Adding sess %p to scst_sess_shut_list", sess);
+ list_add_tail(&sess->sess_shut_list_entry, &scst_sess_shut_list);
+ spin_unlock_irqrestore(&scst_mgmt_lock, flags);
+
+ wake_up(&scst_mgmt_waitQ);
+ return;
+}
+
+/**
+ * scst_cmd_get() - increase command's reference counter
+ */
+void scst_cmd_get(struct scst_cmd *cmd)
+{
+ __scst_cmd_get(cmd);
+}
+EXPORT_SYMBOL_GPL(scst_cmd_get);
+
+/**
+ * scst_cmd_put() - decrease command's reference counter
+ */
+void scst_cmd_put(struct scst_cmd *cmd)
+{
+ __scst_cmd_put(cmd);
+}
+EXPORT_SYMBOL_GPL(scst_cmd_put);
+
+struct scst_cmd *scst_alloc_cmd(gfp_t gfp_mask)
+{
+ struct scst_cmd *cmd;
+
+ cmd = kmem_cache_zalloc(scst_cmd_cachep, gfp_mask);
+ if (cmd == NULL) {
+ TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of scst_cmd failed");
+ goto out;
+ }
+
+ cmd->state = SCST_CMD_STATE_INIT_WAIT;
+ cmd->start_time = jiffies;
+ atomic_set(&cmd->cmd_ref, 1);
+ cmd->cmd_threads = &scst_main_cmd_threads;
+ INIT_LIST_HEAD(&cmd->mgmt_cmd_list);
+ cmd->queue_type = SCST_CMD_QUEUE_SIMPLE;
+ cmd->timeout = SCST_DEFAULT_TIMEOUT;
+ cmd->retries = 0;
+ cmd->data_len = -1;
+ cmd->is_send_status = 1;
+ cmd->resp_data_len = -1;
+
+ cmd->dbl_ua_orig_data_direction = SCST_DATA_UNKNOWN;
+ cmd->dbl_ua_orig_resp_data_len = -1;
+
+out:
+ return cmd;
+}
+
+static void scst_destroy_put_cmd(struct scst_cmd *cmd)
+{
+ scst_sess_put(cmd->sess);
+
+ /*
+ * At this point tgt_dev can be dead, but the pointer remains non-NULL
+ */
+ if (likely(cmd->tgt_dev != NULL))
+ __scst_put();
+
+ scst_destroy_cmd(cmd);
+ return;
+}
+
+/* No locks supposed to be held */
+void scst_free_cmd(struct scst_cmd *cmd)
+{
+ int destroy = 1;
+
+ TRACE_DBG("Freeing cmd %p (tag %llu)",
+ cmd, (long long unsigned int)cmd->tag);
+
+ if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags))) {
+ TRACE_MGMT_DBG("Freeing aborted cmd %p (scst_cmd_count %d)",
+ cmd, atomic_read(&scst_cmd_count));
+ }
+
+ BUG_ON(cmd->inc_blocking || cmd->needs_unblocking ||
+ cmd->dec_on_dev_needed);
+
+ /*
+ * Target driver can already free sg buffer before calling
+ * scst_tgt_cmd_done(). E.g., scst_local has to do that.
+ */
+ if (!cmd->tgt_data_buf_alloced)
+ scst_check_restore_sg_buff(cmd);
+
+ if ((cmd->tgtt->on_free_cmd != NULL) && likely(!cmd->internal)) {
+ TRACE_DBG("Calling target's on_free_cmd(%p)", cmd);
+ scst_set_cur_start(cmd);
+ cmd->tgtt->on_free_cmd(cmd);
+ scst_set_tgt_on_free_time(cmd);
+ TRACE_DBG("%s", "Target's on_free_cmd() returned");
+ }
+
+ if (likely(cmd->dev != NULL)) {
+ struct scst_dev_type *handler = cmd->dev->handler;
+ if (handler->on_free_cmd != NULL) {
+ TRACE_DBG("Calling dev handler %s on_free_cmd(%p)",
+ handler->name, cmd);
+ scst_set_cur_start(cmd);
+ handler->on_free_cmd(cmd);
+ scst_set_dev_on_free_time(cmd);
+ TRACE_DBG("Dev handler %s on_free_cmd() returned",
+ handler->name);
+ }
+ }
+
+ scst_release_space(cmd);
+
+ if (unlikely(cmd->sense != NULL)) {
+ TRACE_MEM("Releasing sense %p (cmd %p)", cmd->sense, cmd);
+ mempool_free(cmd->sense, scst_sense_mempool);
+ cmd->sense = NULL;
+ }
+
+ if (likely(cmd->tgt_dev != NULL)) {
+#ifdef CONFIG_SCST_EXTRACHECKS
+ if (unlikely(!cmd->sent_for_exec) && !cmd->internal) {
+ PRINT_ERROR("Finishing not executed cmd %p (opcode "
+ "%d, target %s, LUN %lld, sn %d, expected_sn %d)",
+ cmd, cmd->cdb[0], cmd->tgtt->name,
+ (long long unsigned int)cmd->lun,
+ cmd->sn, cmd->tgt_dev->expected_sn);
+ scst_unblock_deferred(cmd->tgt_dev, cmd);
+ }
+#endif
+
+ if (unlikely(cmd->out_of_sn)) {
+ TRACE_SN("Out of SN cmd %p (tag %llu, sn %d), "
+ "destroy=%d", cmd,
+ (long long unsigned int)cmd->tag,
+ cmd->sn, destroy);
+ destroy = test_and_set_bit(SCST_CMD_CAN_BE_DESTROYED,
+ &cmd->cmd_flags);
+ }
+ }
+
+ if (likely(destroy))
+ scst_destroy_put_cmd(cmd);
+ return;
+}
+
+/* No locks supposed to be held. */
+void scst_check_retries(struct scst_tgt *tgt)
+{
+ int need_wake_up = 0;
+
+ /*
+ * We don't worry about overflow of finished_cmds, because we check
+ * only for its change.
+ */
+ atomic_inc(&tgt->finished_cmds);
+ /* See comment in scst_queue_retry_cmd() */
+ smp_mb__after_atomic_inc();
+ if (unlikely(tgt->retry_cmds > 0)) {
+ struct scst_cmd *c, *tc;
+ unsigned long flags;
+
+ TRACE_RETRY("Checking retry cmd list (retry_cmds %d)",
+ tgt->retry_cmds);
+
+ spin_lock_irqsave(&tgt->tgt_lock, flags);
+ list_for_each_entry_safe(c, tc, &tgt->retry_cmd_list,
+ cmd_list_entry) {
+ tgt->retry_cmds--;
+
+ TRACE_RETRY("Moving retry cmd %p to head of active "
+ "cmd list (retry_cmds left %d)",
+ c, tgt->retry_cmds);
+ spin_lock(&c->cmd_threads->cmd_list_lock);
+ list_move(&c->cmd_list_entry,
+ &c->cmd_threads->active_cmd_list);
+ wake_up(&c->cmd_threads->cmd_list_waitQ);
+ spin_unlock(&c->cmd_threads->cmd_list_lock);
+
+ need_wake_up++;
+ if (need_wake_up >= 2) /* "slow start" */
+ break;
+ }
+ spin_unlock_irqrestore(&tgt->tgt_lock, flags);
+ }
+ return;
+}
+
+static void scst_tgt_retry_timer_fn(unsigned long arg)
+{
+ struct scst_tgt *tgt = (struct scst_tgt *)arg;
+ unsigned long flags;
+
+ TRACE_RETRY("Retry timer expired (retry_cmds %d)", tgt->retry_cmds);
+
+ spin_lock_irqsave(&tgt->tgt_lock, flags);
+ tgt->retry_timer_active = 0;
+ spin_unlock_irqrestore(&tgt->tgt_lock, flags);
+
+ scst_check_retries(tgt);
+ return;
+}
+
+struct scst_mgmt_cmd *scst_alloc_mgmt_cmd(gfp_t gfp_mask)
+{
+ struct scst_mgmt_cmd *mcmd;
+
+ mcmd = mempool_alloc(scst_mgmt_mempool, gfp_mask);
+ if (mcmd == NULL) {
+ PRINT_CRIT_ERROR("%s", "Allocation of management command "
+ "failed, some commands and their data could leak");
+ goto out;
+ }
+ memset(mcmd, 0, sizeof(*mcmd));
+
+out:
+ return mcmd;
+}
+
+void scst_free_mgmt_cmd(struct scst_mgmt_cmd *mcmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mcmd->sess->sess_list_lock, flags);
+ atomic_dec(&mcmd->sess->sess_cmd_count);
+ spin_unlock_irqrestore(&mcmd->sess->sess_list_lock, flags);
+
+ scst_sess_put(mcmd->sess);
+
+ if (mcmd->mcmd_tgt_dev != NULL)
+ __scst_put();
+
+ mempool_free(mcmd, scst_mgmt_mempool);
+ return;
+}
+
+static bool is_report_sg_limitation(void)
+{
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+ return (trace_flag & TRACE_OUT_OF_MEM) != 0;
+#else
+ return false;
+#endif
+}
+
+int scst_alloc_space(struct scst_cmd *cmd)
+{
+ gfp_t gfp_mask;
+ int res = -ENOMEM;
+ int atomic = scst_cmd_atomic(cmd);
+ int flags;
+ struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
+ static int ll;
+
+ gfp_mask = tgt_dev->gfp_mask | (atomic ? GFP_ATOMIC : GFP_KERNEL);
+
+ flags = atomic ? SGV_POOL_NO_ALLOC_ON_CACHE_MISS : 0;
+ if (cmd->no_sgv)
+ flags |= SGV_POOL_ALLOC_NO_CACHED;
+
+ cmd->sg = sgv_pool_alloc(tgt_dev->pool, cmd->bufflen, gfp_mask, flags,
+ &cmd->sg_cnt, &cmd->sgv, &cmd->dev->dev_mem_lim, NULL);
+ if (cmd->sg == NULL)
+ goto out;
+
+ if (unlikely(cmd->sg_cnt > tgt_dev->max_sg_cnt)) {
+ if ((ll < 10) || is_report_sg_limitation()) {
+ PRINT_INFO("Unable to complete command due to "
+ "SG IO count limitation (requested %d, "
+ "available %d, tgt lim %d)", cmd->sg_cnt,
+ tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize);
+ ll++;
+ }
+ goto out_sg_free;
+ }
+
+ if (cmd->data_direction != SCST_DATA_BIDI)
+ goto success;
+
+ cmd->in_sg = sgv_pool_alloc(tgt_dev->pool, cmd->in_bufflen, gfp_mask,
+ flags, &cmd->in_sg_cnt, &cmd->in_sgv,
+ &cmd->dev->dev_mem_lim, NULL);
+ if (cmd->in_sg == NULL)
+ goto out_sg_free;
+
+ if (unlikely(cmd->in_sg_cnt > tgt_dev->max_sg_cnt)) {
+ if ((ll < 10) || is_report_sg_limitation()) {
+ PRINT_INFO("Unable to complete command due to "
+ "SG IO count limitation (IN buffer, requested "
+ "%d, available %d, tgt lim %d)", cmd->in_sg_cnt,
+ tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize);
+ ll++;
+ }
+ goto out_in_sg_free;
+ }
+
+success:
+ res = 0;
+
+out:
+ return res;
+
+out_in_sg_free:
+ sgv_pool_free(cmd->in_sgv, &cmd->dev->dev_mem_lim);
+ cmd->in_sgv = NULL;
+ cmd->in_sg = NULL;
+ cmd->in_sg_cnt = 0;
+
+out_sg_free:
+ sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim);
+ cmd->sgv = NULL;
+ cmd->sg = NULL;
+ cmd->sg_cnt = 0;
+ goto out;
+}
+
+static void scst_release_space(struct scst_cmd *cmd)
+{
+
+ if (cmd->sgv == NULL) {
+ if ((cmd->sg != NULL) &&
+ !(cmd->tgt_data_buf_alloced || cmd->dh_data_buf_alloced)) {
+ TRACE_MEM("Freeing sg %p for cmd %p (cnt %d)", cmd->sg,
+ cmd, cmd->sg_cnt);
+ scst_free(cmd->sg, cmd->sg_cnt);
+ goto out_zero;
+ } else
+ goto out;
+ }
+
+ if (cmd->tgt_data_buf_alloced || cmd->dh_data_buf_alloced) {
+ TRACE_MEM("%s", "*data_buf_alloced set, returning");
+ goto out;
+ }
+
+ if (cmd->in_sgv != NULL) {
+ sgv_pool_free(cmd->in_sgv, &cmd->dev->dev_mem_lim);
+ cmd->in_sgv = NULL;
+ cmd->in_sg_cnt = 0;
+ cmd->in_sg = NULL;
+ cmd->in_bufflen = 0;
+ }
+
+ sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim);
+
+out_zero:
+ cmd->sgv = NULL;
+ cmd->sg_cnt = 0;
+ cmd->sg = NULL;
+ cmd->bufflen = 0;
+ cmd->data_len = 0;
+
+out:
+ return;
+}
+
+static void scsi_end_async(struct request *req, int error)
+{
+ struct scsi_io_context *sioc = req->end_io_data;
+
+ TRACE_DBG("sioc %p, cmd %p", sioc, sioc->data);
+
+ if (sioc->done)
+ sioc->done(sioc->data, sioc->sense, req->errors, req->resid_len);
+
+ if (!sioc->full_cdb_used)
+ kmem_cache_free(scsi_io_context_cache, sioc);
+ else
+ kfree(sioc);
+
+ __blk_put_request(req->q, req);
+ return;
+}
+
+/**
+ * scst_scsi_exec_async - executes a SCSI command in pass-through mode
+ * @cmd: scst command
+ * @done: callback function when done
+ */
+int scst_scsi_exec_async(struct scst_cmd *cmd,
+ void (*done)(void *, char *, int, int))
+{
+ int res = 0;
+ struct request_queue *q = cmd->dev->scsi_dev->request_queue;
+ struct request *rq;
+ struct scsi_io_context *sioc;
+ int write = (cmd->data_direction & SCST_DATA_WRITE) ? WRITE : READ;
+ gfp_t gfp = scst_cmd_atomic(cmd) ? GFP_ATOMIC : GFP_KERNEL;
+ int cmd_len = cmd->cdb_len;
+
+ if (cmd->ext_cdb_len == 0) {
+ TRACE_DBG("Simple CDB (cmd_len %d)", cmd_len);
+ sioc = kmem_cache_zalloc(scsi_io_context_cache, gfp);
+ if (sioc == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+ } else {
+ cmd_len += cmd->ext_cdb_len;
+
+ TRACE_DBG("Extended CDB (cmd_len %d)", cmd_len);
+
+ sioc = kzalloc(sizeof(*sioc) + cmd_len, gfp);
+ if (sioc == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+
+ sioc->full_cdb_used = 1;
+
+ memcpy(sioc->full_cdb, cmd->cdb, cmd->cdb_len);
+ memcpy(&sioc->full_cdb[cmd->cdb_len], cmd->ext_cdb,
+ cmd->ext_cdb_len);
+ }
+
+ rq = blk_get_request(q, write, gfp);
+ if (rq == NULL) {
+ res = -ENOMEM;
+ goto out_free_sioc;
+ }
+
+ rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ rq->cmd_flags |= REQ_QUIET;
+
+ if (cmd->sg != NULL) {
+ res = blk_rq_map_kern_sg(rq, cmd->sg, cmd->sg_cnt, gfp);
+ if (res) {
+ TRACE_DBG("blk_rq_map_kern_sg() failed: %d", res);
+ goto out_free_rq;
+ }
+ }
+
+ if (cmd->data_direction == SCST_DATA_BIDI) {
+ struct request *next_rq;
+
+ if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
+ res = -EOPNOTSUPP;
+ goto out_free_unmap;
+ }
+
+ next_rq = blk_get_request(q, READ, gfp);
+ if (next_rq == NULL) {
+ res = -ENOMEM;
+ goto out_free_unmap;
+ }
+ rq->next_rq = next_rq;
+ next_rq->cmd_type = rq->cmd_type;
+
+ res = blk_rq_map_kern_sg(next_rq, cmd->in_sg,
+ cmd->in_sg_cnt, gfp);
+ if (res != 0)
+ goto out_free_unmap;
+ }
+
+ TRACE_DBG("sioc %p, cmd %p", sioc, cmd);
+
+ sioc->data = cmd;
+ sioc->done = done;
+
+ rq->cmd_len = cmd_len;
+ if (cmd->ext_cdb_len == 0) {
+ memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
+ memcpy(rq->cmd, cmd->cdb, cmd->cdb_len);
+ } else
+ rq->cmd = sioc->full_cdb;
+
+ rq->sense = sioc->sense;
+ rq->sense_len = sizeof(sioc->sense);
+ rq->timeout = cmd->timeout;
+ rq->retries = cmd->retries;
+ rq->end_io_data = sioc;
+
+ blk_execute_rq_nowait(rq->q, NULL, rq,
+ (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE), scsi_end_async);
+out:
+ return res;
+
+out_free_unmap:
+ if (rq->next_rq != NULL) {
+ blk_put_request(rq->next_rq);
+ rq->next_rq = NULL;
+ }
+ blk_rq_unmap_kern_sg(rq, res);
+
+out_free_rq:
+ blk_put_request(rq);
+
+out_free_sioc:
+ if (!sioc->full_cdb_used)
+ kmem_cache_free(scsi_io_context_cache, sioc);
+ else
+ kfree(sioc);
+ goto out;
+}
+
+/**
+ * scst_copy_sg() - copy data between the command's SGs
+ *
+ * Copies data between cmd->tgt_sg and cmd->sg in direction defined by
+ * copy_dir parameter.
+ */
+void scst_copy_sg(struct scst_cmd *cmd, enum scst_sg_copy_dir copy_dir)
+{
+ struct scatterlist *src_sg, *dst_sg;
+ unsigned int to_copy;
+ int atomic = scst_cmd_atomic(cmd);
+
+ if (copy_dir == SCST_SG_COPY_FROM_TARGET) {
+ if (cmd->data_direction != SCST_DATA_BIDI) {
+ src_sg = cmd->tgt_sg;
+ dst_sg = cmd->sg;
+ to_copy = cmd->bufflen;
+ } else {
+ TRACE_MEM("BIDI cmd %p", cmd);
+ src_sg = cmd->tgt_in_sg;
+ dst_sg = cmd->in_sg;
+ to_copy = cmd->in_bufflen;
+ }
+ } else {
+ src_sg = cmd->sg;
+ dst_sg = cmd->tgt_sg;
+ to_copy = cmd->resp_data_len;
+ }
+
+ TRACE_MEM("cmd %p, copy_dir %d, src_sg %p, dst_sg %p, to_copy %lld",
+ cmd, copy_dir, src_sg, dst_sg, (long long)to_copy);
+
+ if (unlikely(src_sg == NULL) || unlikely(dst_sg == NULL)) {
+ /*
+ * It can happened, e.g., with scst_user for cmd with delay
+ * alloc, which failed with Check Condition.
+ */
+ goto out;
+ }
+
+ sg_copy(dst_sg, src_sg, 0, to_copy,
+ atomic ? KM_SOFTIRQ0 : KM_USER0,
+ atomic ? KM_SOFTIRQ1 : KM_USER1);
+
+out:
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_copy_sg);
+
+static const int SCST_CDB_LENGTH[8] = { 6, 10, 10, -1, 16, 12, -1, -1 };
+
+#define SCST_CDB_GROUP(opcode) ((opcode >> 5) & 0x7)
+#define SCST_GET_CDB_LEN(opcode) SCST_CDB_LENGTH[SCST_CDB_GROUP(opcode)]
+
+int scst_get_cdb_len(const uint8_t *cdb)
+{
+ return SCST_GET_CDB_LEN(cdb[0]);
+}
+
+/* get_trans_len_x extract x bytes from cdb as length starting from off */
+
+static int get_trans_cdb_len_10(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->cdb_len = 10;
+ cmd->bufflen = 0;
+ return 0;
+}
+
+static int get_trans_len_block_limit(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->bufflen = 6;
+ return 0;
+}
+
+static int get_trans_len_read_capacity(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->bufflen = READ_CAP_LEN;
+ return 0;
+}
+
+static int get_trans_len_serv_act_in(struct scst_cmd *cmd, uint8_t off)
+{
+ int res = 0;
+
+ if ((cmd->cdb[1] & 0x1f) == SAI_READ_CAPACITY_16) {
+ cmd->op_name = "READ CAPACITY(16)";
+ cmd->bufflen = READ_CAP16_LEN;
+ cmd->op_flags |= SCST_IMPLICIT_HQ|SCST_REG_RESERVE_ALLOWED;
+ } else
+ cmd->op_flags |= SCST_UNKNOWN_LENGTH;
+ return res;
+}
+
+static int get_trans_len_single(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->bufflen = 1;
+ return 0;
+}
+
+static int get_trans_len_read_pos(struct scst_cmd *cmd, uint8_t off)
+{
+ uint8_t *p = (uint8_t *)cmd->cdb + off;
+ int res = 0;
+
+ cmd->bufflen = 0;
+ cmd->bufflen |= ((u32)p[0]) << 8;
+ cmd->bufflen |= ((u32)p[1]);
+
+ switch (cmd->cdb[1] & 0x1f) {
+ case 0:
+ case 1:
+ case 6:
+ if (cmd->bufflen != 0) {
+ PRINT_ERROR("READ POSITION: Invalid non-zero (%d) "
+ "allocation length for service action %x",
+ cmd->bufflen, cmd->cdb[1] & 0x1f);
+ goto out_inval;
+ }
+ break;
+ }
+
+ switch (cmd->cdb[1] & 0x1f) {
+ case 0:
+ case 1:
+ cmd->bufflen = 20;
+ break;
+ case 6:
+ cmd->bufflen = 32;
+ break;
+ case 8:
+ cmd->bufflen = max(28, cmd->bufflen);
+ break;
+ default:
+ PRINT_ERROR("READ POSITION: Invalid service action %x",
+ cmd->cdb[1] & 0x1f);
+ goto out_inval;
+ }
+
+out:
+ return res;
+
+out_inval:
+ scst_set_cmd_error(cmd,
+ SCST_LOAD_SENSE(scst_sense_invalid_field_in_cdb));
+ res = 1;
+ goto out;
+}
+
+static int get_trans_len_prevent_allow_medium_removal(struct scst_cmd *cmd,
+ uint8_t off)
+{
+ if ((cmd->cdb[4] & 3) == 0)
+ cmd->op_flags |= SCST_REG_RESERVE_ALLOWED;
+ return 0;
+}
+
+static int get_trans_len_start_stop(struct scst_cmd *cmd, uint8_t off)
+{
+ if ((cmd->cdb[4] & 0xF1) == 0x1)
+ cmd->op_flags |= SCST_REG_RESERVE_ALLOWED;
+ return 0;
+}
+
+static int get_trans_len_3_read_elem_stat(struct scst_cmd *cmd, uint8_t off)
+{
+ const uint8_t *p = cmd->cdb + off;
+
+ cmd->bufflen = 0;
+ cmd->bufflen |= ((u32)p[0]) << 16;
+ cmd->bufflen |= ((u32)p[1]) << 8;
+ cmd->bufflen |= ((u32)p[2]);
+
+ if ((cmd->cdb[6] & 0x2) == 0x2)
+ cmd->op_flags |= SCST_REG_RESERVE_ALLOWED;
+
+ return 0;
+}
+
+static int get_trans_len_1(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->bufflen = (u32)cmd->cdb[off];
+ return 0;
+}
+
+static int get_trans_len_1_256(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->bufflen = (u32)cmd->cdb[off];
+ if (cmd->bufflen == 0)
+ cmd->bufflen = 256;
+ return 0;
+}
+
+static int get_trans_len_2(struct scst_cmd *cmd, uint8_t off)
+{
+ const uint8_t *p = cmd->cdb + off;
+
+ cmd->bufflen = 0;
+ cmd->bufflen |= ((u32)p[0]) << 8;
+ cmd->bufflen |= ((u32)p[1]);
+
+ return 0;
+}
+
+static int get_trans_len_3(struct scst_cmd *cmd, uint8_t off)
+{
+ const uint8_t *p = cmd->cdb + off;
+
+ cmd->bufflen = 0;
+ cmd->bufflen |= ((u32)p[0]) << 16;
+ cmd->bufflen |= ((u32)p[1]) << 8;
+ cmd->bufflen |= ((u32)p[2]);
+
+ return 0;
+}
+
+static int get_trans_len_4(struct scst_cmd *cmd, uint8_t off)
+{
+ const uint8_t *p = cmd->cdb + off;
+
+ cmd->bufflen = 0;
+ cmd->bufflen |= ((u32)p[0]) << 24;
+ cmd->bufflen |= ((u32)p[1]) << 16;
+ cmd->bufflen |= ((u32)p[2]) << 8;
+ cmd->bufflen |= ((u32)p[3]);
+
+ return 0;
+}
+
+static int get_trans_len_none(struct scst_cmd *cmd, uint8_t off)
+{
+ cmd->bufflen = 0;
+ return 0;
+}
+
+/**
+ * scst_get_cdb_info() - fill various info about the command's CDB
+ *
+ * Description:
+ * Fills various info about the command's CDB in the corresponding fields
+ * in the command.
+ *
+ * Returns: 0 on success, <0 if command is unknown, >0 if command
+ * is invalid.
+ */
+int scst_get_cdb_info(struct scst_cmd *cmd)
+{
+ int dev_type = cmd->dev->type;
+ int i, res = 0;
+ uint8_t op;
+ const struct scst_sdbops *ptr = NULL;
+
+ op = cmd->cdb[0]; /* get clear opcode */
+
+ TRACE_DBG("opcode=%02x, cdblen=%d bytes, tblsize=%d, "
+ "dev_type=%d", op, SCST_GET_CDB_LEN(op), SCST_CDB_TBL_SIZE,
+ dev_type);
+
+ i = scst_scsi_op_list[op];
+ while (i < SCST_CDB_TBL_SIZE && scst_scsi_op_table[i].ops == op) {
+ if (scst_scsi_op_table[i].devkey[dev_type] != SCST_CDB_NOTSUPP) {
+ ptr = &scst_scsi_op_table[i];
+ TRACE_DBG("op = 0x%02x+'%c%c%c%c%c%c%c%c%c%c'+<%s>",
+ ptr->ops, ptr->devkey[0], /* disk */
+ ptr->devkey[1], /* tape */
+ ptr->devkey[2], /* printer */
+ ptr->devkey[3], /* cpu */
+ ptr->devkey[4], /* cdr */
+ ptr->devkey[5], /* cdrom */
+ ptr->devkey[6], /* scanner */
+ ptr->devkey[7], /* worm */
+ ptr->devkey[8], /* changer */
+ ptr->devkey[9], /* commdev */
+ ptr->op_name);
+ TRACE_DBG("direction=%d flags=%d off=%d",
+ ptr->direction,
+ ptr->flags,
+ ptr->off);
+ break;
+ }
+ i++;
+ }
+
+ if (unlikely(ptr == NULL)) {
+ /* opcode not found or now not used */
+ TRACE(TRACE_MINOR, "Unknown opcode 0x%x for type %d", op,
+ dev_type);
+ res = -1;
+ goto out;
+ }
+
+ cmd->cdb_len = SCST_GET_CDB_LEN(op);
+ cmd->op_name = ptr->op_name;
+ cmd->data_direction = ptr->direction;
+ cmd->op_flags = ptr->flags | SCST_INFO_VALID;
+ res = (*ptr->get_trans_len)(cmd, ptr->off);
+
+out:
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_get_cdb_info);
+
+/* Packs SCST LUN back to SCSI form */
+uint64_t scst_pack_lun(const uint64_t lun, unsigned int addr_method)
+{
+
+ uint64_t res = 0;
+ uint16_t *p = (uint16_t *)&res;
+
+ res = lun;
+
+ if ((addr_method == SCST_LUN_ADDR_METHOD_FLAT) && (lun != 0)) {
+ /*
+ * Flat space: luns other than 0 should use flat space
+ * addressing method.
+ */
+ *p = 0x7fff & *p;
+ *p = 0x4000 | *p;
+ }
+ /* Default is to use peripheral device addressing mode */
+
+ *p = cpu_to_be16(*p);
+ return res;
+}
+
+/*
+ * Routine to extract a lun number from an 8-byte LUN structure
+ * in network byte order (BE).
+ * (see SAM-2, Section 4.12.3 page 40)
+ * Supports 2 types of lun unpacking: peripheral and logical unit.
+ */
+uint64_t scst_unpack_lun(const uint8_t *lun, int len)
+{
+ uint64_t res = NO_SUCH_LUN;
+ int address_method;
+
+ TRACE_BUFF_FLAG(TRACE_DEBUG, "Raw LUN", lun, len);
+
+ if (unlikely(len < 2)) {
+ PRINT_ERROR("Illegal lun length %d, expected 2 bytes or "
+ "more", len);
+ goto out;
+ }
+
+ if (len > 2) {
+ switch (len) {
+ case 8:
+ if ((*((uint64_t *)lun) &
+ __constant_cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0)
+ goto out_err;
+ break;
+ case 4:
+ if (*((uint16_t *)&lun[2]) != 0)
+ goto out_err;
+ break;
+ case 6:
+ if (*((uint32_t *)&lun[2]) != 0)
+ goto out_err;
+ break;
+ default:
+ goto out_err;
+ }
+ }
+
+ address_method = (*lun) >> 6; /* high 2 bits of byte 0 */
+ switch (address_method) {
+ case 0: /* peripheral device addressing method */
+#if 0
+ if (*lun) {
+ PRINT_ERROR("Illegal BUS INDENTIFIER in LUN "
+ "peripheral device addressing method 0x%02x, "
+ "expected 0", *lun);
+ break;
+ }
+ res = *(lun + 1);
+ break;
+#else
+ /*
+ * Looks like it's legal to use it as flat space addressing
+ * method as well
+ */
+
+ /* go through */
+#endif
+
+ case 1: /* flat space addressing method */
+ res = *(lun + 1) | (((*lun) & 0x3f) << 8);
+ break;
+
+ case 2: /* logical unit addressing method */
+ if (*lun & 0x3f) {
+ PRINT_ERROR("Illegal BUS NUMBER in LUN logical unit "
+ "addressing method 0x%02x, expected 0",
+ *lun & 0x3f);
+ break;
+ }
+ if (*(lun + 1) & 0xe0) {
+ PRINT_ERROR("Illegal TARGET in LUN logical unit "
+ "addressing method 0x%02x, expected 0",
+ (*(lun + 1) & 0xf8) >> 5);
+ break;
+ }
+ res = *(lun + 1) & 0x1f;
+ break;
+
+ case 3: /* extended logical unit addressing method */
+ default:
+ PRINT_ERROR("Unimplemented LUN addressing method %u",
+ address_method);
+ break;
+ }
+
+out:
+ return res;
+
+out_err:
+ PRINT_ERROR("%s", "Multi-level LUN unimplemented");
+ goto out;
+}
+
+/**
+ ** Generic parse() support routines.
+ ** Done via pointer on functions to avoid unneeded dereferences on
+ ** the fast path.
+ **/
+
+/**
+ * scst_calc_block_shift() - calculate block shift
+ *
+ * Calculates and returns block shift for the given sector size
+ */
+int scst_calc_block_shift(int sector_size)
+{
+ int block_shift = 0;
+ int t;
+
+ if (sector_size == 0)
+ sector_size = 512;
+
+ t = sector_size;
+ while (1) {
+ if ((t & 1) != 0)
+ break;
+ t >>= 1;
+ block_shift++;
+ }
+ if (block_shift < 9) {
+ PRINT_ERROR("Wrong sector size %d", sector_size);
+ block_shift = -1;
+ }
+ return block_shift;
+}
+EXPORT_SYMBOL_GPL(scst_calc_block_shift);
+
+/**
+ * scst_sbc_generic_parse() - generic SBC parsing
+ *
+ * Generic parse() for SBC (disk) devices
+ */
+int scst_sbc_generic_parse(struct scst_cmd *cmd,
+ int (*get_block_shift)(struct scst_cmd *cmd))
+{
+ int res = 0;
+
+ /*
+ * SCST sets good defaults for cmd->data_direction and cmd->bufflen,
+ * therefore change them only if necessary
+ */
+
+ TRACE_DBG("op_name <%s> direct %d flags %d transfer_len %d",
+ cmd->op_name, cmd->data_direction, cmd->op_flags, cmd->bufflen);
+
+ switch (cmd->cdb[0]) {
+ case VERIFY_6:
+ case VERIFY:
+ case VERIFY_12:
+ case VERIFY_16:
+ if ((cmd->cdb[1] & BYTCHK) == 0) {
+ cmd->data_len = cmd->bufflen << get_block_shift(cmd);
+ cmd->bufflen = 0;
+ goto set_timeout;
+ } else
+ cmd->data_len = 0;
+ break;
+ default:
+ /* It's all good */
+ break;
+ }
+
+ if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED) {
+ /*
+ * No need for locks here, since *_detach() can not be
+ * called, when there are existing commands.
+ */
+ cmd->bufflen = cmd->bufflen << get_block_shift(cmd);
+ }
+
+set_timeout:
+ if ((cmd->op_flags & (SCST_SMALL_TIMEOUT | SCST_LONG_TIMEOUT)) == 0)
+ cmd->timeout = SCST_GENERIC_DISK_REG_TIMEOUT;
+ else if (cmd->op_flags & SCST_SMALL_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT;
+ else if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_DISK_LONG_TIMEOUT;
+
+ TRACE_DBG("res %d, bufflen %d, data_len %d, direct %d",
+ res, cmd->bufflen, cmd->data_len, cmd->data_direction);
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_sbc_generic_parse);
+
+/**
+ * scst_cdrom_generic_parse() - generic MMC parse
+ *
+ * Generic parse() for MMC (cdrom) devices
+ */
+int scst_cdrom_generic_parse(struct scst_cmd *cmd,
+ int (*get_block_shift)(struct scst_cmd *cmd))
+{
+ int res = 0;
+
+ /*
+ * SCST sets good defaults for cmd->data_direction and cmd->bufflen,
+ * therefore change them only if necessary
+ */
+
+ TRACE_DBG("op_name <%s> direct %d flags %d transfer_len %d",
+ cmd->op_name, cmd->data_direction, cmd->op_flags, cmd->bufflen);
+
+ cmd->cdb[1] &= 0x1f;
+
+ switch (cmd->cdb[0]) {
+ case VERIFY_6:
+ case VERIFY:
+ case VERIFY_12:
+ case VERIFY_16:
+ if ((cmd->cdb[1] & BYTCHK) == 0) {
+ cmd->data_len = cmd->bufflen << get_block_shift(cmd);
+ cmd->bufflen = 0;
+ goto set_timeout;
+ }
+ break;
+ default:
+ /* It's all good */
+ break;
+ }
+
+ if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED)
+ cmd->bufflen = cmd->bufflen << get_block_shift(cmd);
+
+set_timeout:
+ if ((cmd->op_flags & (SCST_SMALL_TIMEOUT | SCST_LONG_TIMEOUT)) == 0)
+ cmd->timeout = SCST_GENERIC_CDROM_REG_TIMEOUT;
+ else if (cmd->op_flags & SCST_SMALL_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_CDROM_SMALL_TIMEOUT;
+ else if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_CDROM_LONG_TIMEOUT;
+
+ TRACE_DBG("res=%d, bufflen=%d, direct=%d", res, cmd->bufflen,
+ cmd->data_direction);
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_cdrom_generic_parse);
+
+/**
+ * scst_modisk_generic_parse() - generic MO parse
+ *
+ * Generic parse() for MO disk devices
+ */
+int scst_modisk_generic_parse(struct scst_cmd *cmd,
+ int (*get_block_shift)(struct scst_cmd *cmd))
+{
+ int res = 0;
+
+ /*
+ * SCST sets good defaults for cmd->data_direction and cmd->bufflen,
+ * therefore change them only if necessary
+ */
+
+ TRACE_DBG("op_name <%s> direct %d flags %d transfer_len %d",
+ cmd->op_name, cmd->data_direction, cmd->op_flags, cmd->bufflen);
+
+ cmd->cdb[1] &= 0x1f;
+
+ switch (cmd->cdb[0]) {
+ case VERIFY_6:
+ case VERIFY:
+ case VERIFY_12:
+ case VERIFY_16:
+ if ((cmd->cdb[1] & BYTCHK) == 0) {
+ cmd->data_len = cmd->bufflen << get_block_shift(cmd);
+ cmd->bufflen = 0;
+ goto set_timeout;
+ }
+ break;
+ default:
+ /* It's all good */
+ break;
+ }
+
+ if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED)
+ cmd->bufflen = cmd->bufflen << get_block_shift(cmd);
+
+set_timeout:
+ if ((cmd->op_flags & (SCST_SMALL_TIMEOUT | SCST_LONG_TIMEOUT)) == 0)
+ cmd->timeout = SCST_GENERIC_MODISK_REG_TIMEOUT;
+ else if (cmd->op_flags & SCST_SMALL_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_MODISK_SMALL_TIMEOUT;
+ else if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_MODISK_LONG_TIMEOUT;
+
+ TRACE_DBG("res=%d, bufflen=%d, direct=%d", res, cmd->bufflen,
+ cmd->data_direction);
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_modisk_generic_parse);
+
+/**
+ * scst_tape_generic_parse() - generic tape parse
+ *
+ * Generic parse() for tape devices
+ */
+int scst_tape_generic_parse(struct scst_cmd *cmd,
+ int (*get_block_size)(struct scst_cmd *cmd))
+{
+ int res = 0;
+
+ /*
+ * SCST sets good defaults for cmd->data_direction and cmd->bufflen,
+ * therefore change them only if necessary
+ */
+
+ TRACE_DBG("op_name <%s> direct %d flags %d transfer_len %d",
+ cmd->op_name, cmd->data_direction, cmd->op_flags, cmd->bufflen);
+
+ if (cmd->cdb[0] == READ_POSITION) {
+ int tclp = cmd->cdb[1] & 4;
+ int long_bit = cmd->cdb[1] & 2;
+ int bt = cmd->cdb[1] & 1;
+
+ if ((tclp == long_bit) && (!bt || !long_bit)) {
+ cmd->bufflen =
+ tclp ? POSITION_LEN_LONG : POSITION_LEN_SHORT;
+ cmd->data_direction = SCST_DATA_READ;
+ } else {
+ cmd->bufflen = 0;
+ cmd->data_direction = SCST_DATA_NONE;
+ }
+ }
+
+ if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED & cmd->cdb[1])
+ cmd->bufflen = cmd->bufflen * get_block_size(cmd);
+
+ if ((cmd->op_flags & (SCST_SMALL_TIMEOUT | SCST_LONG_TIMEOUT)) == 0)
+ cmd->timeout = SCST_GENERIC_TAPE_REG_TIMEOUT;
+ else if (cmd->op_flags & SCST_SMALL_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_TAPE_SMALL_TIMEOUT;
+ else if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_TAPE_LONG_TIMEOUT;
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_tape_generic_parse);
+
+static int scst_null_parse(struct scst_cmd *cmd)
+{
+ int res = 0;
+
+ /*
+ * SCST sets good defaults for cmd->data_direction and cmd->bufflen,
+ * therefore change them only if necessary
+ */
+
+ TRACE_DBG("op_name <%s> direct %d flags %d transfer_len %d",
+ cmd->op_name, cmd->data_direction, cmd->op_flags, cmd->bufflen);
+#if 0
+ switch (cmd->cdb[0]) {
+ default:
+ /* It's all good */
+ break;
+ }
+#endif
+ TRACE_DBG("res %d bufflen %d direct %d",
+ res, cmd->bufflen, cmd->data_direction);
+ return res;
+}
+
+/**
+ * scst_changer_generic_parse() - generic changer parse
+ *
+ * Generic parse() for changer devices
+ */
+int scst_changer_generic_parse(struct scst_cmd *cmd,
+ int (*nothing)(struct scst_cmd *cmd))
+{
+ int res = scst_null_parse(cmd);
+
+ if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_CHANGER_LONG_TIMEOUT;
+ else
+ cmd->timeout = SCST_GENERIC_CHANGER_TIMEOUT;
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_changer_generic_parse);
+
+/**
+ * scst_processor_generic_parse - generic SCSI processor parse
+ *
+ * Generic parse() for SCSI processor devices
+ */
+int scst_processor_generic_parse(struct scst_cmd *cmd,
+ int (*nothing)(struct scst_cmd *cmd))
+{
+ int res = scst_null_parse(cmd);
+
+ if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_PROCESSOR_LONG_TIMEOUT;
+ else
+ cmd->timeout = SCST_GENERIC_PROCESSOR_TIMEOUT;
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_processor_generic_parse);
+
+/**
+ * scst_raid_generic_parse() - generic RAID parse
+ *
+ * Generic parse() for RAID devices
+ */
+int scst_raid_generic_parse(struct scst_cmd *cmd,
+ int (*nothing)(struct scst_cmd *cmd))
+{
+ int res = scst_null_parse(cmd);
+
+ if (cmd->op_flags & SCST_LONG_TIMEOUT)
+ cmd->timeout = SCST_GENERIC_RAID_LONG_TIMEOUT;
+ else
+ cmd->timeout = SCST_GENERIC_RAID_TIMEOUT;
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_raid_generic_parse);
+
+/**
+ ** Generic dev_done() support routines.
+ ** Done via pointer on functions to avoid unneeded dereferences on
+ ** the fast path.
+ **/
+
+/**
+ * scst_block_generic_dev_done() - generic SBC dev_done
+ *
+ * Generic dev_done() for block (SBC) devices
+ */
+int scst_block_generic_dev_done(struct scst_cmd *cmd,
+ void (*set_block_shift)(struct scst_cmd *cmd, int block_shift))
+{
+ int opcode = cmd->cdb[0];
+ int status = cmd->status;
+ int res = SCST_CMD_STATE_DEFAULT;
+
+ /*
+ * SCST sets good defaults for cmd->is_send_status and
+ * cmd->resp_data_len based on cmd->status and cmd->data_direction,
+ * therefore change them only if necessary
+ */
+
+ if ((status == SAM_STAT_GOOD) || (status == SAM_STAT_CONDITION_MET)) {
+ switch (opcode) {
+ case READ_CAPACITY:
+ {
+ /* Always keep track of disk capacity */
+ int buffer_size, sector_size, sh;
+ uint8_t *buffer;
+
+ buffer_size = scst_get_buf_first(cmd, &buffer);
+ if (unlikely(buffer_size <= 0)) {
+ if (buffer_size < 0) {
+ PRINT_ERROR("%s: Unable to get the"
+ " buffer (%d)", __func__, buffer_size);
+ }
+ goto out;
+ }
+
+ sector_size =
+ ((buffer[4] << 24) | (buffer[5] << 16) |
+ (buffer[6] << 8) | (buffer[7] << 0));
+ scst_put_buf(cmd, buffer);
+ if (sector_size != 0)
+ sh = scst_calc_block_shift(sector_size);
+ else
+ sh = 0;
+ set_block_shift(cmd, sh);
+ TRACE_DBG("block_shift %d", sh);
+ break;
+ }
+ default:
+ /* It's all good */
+ break;
+ }
+ }
+
+ TRACE_DBG("cmd->is_send_status=%x, cmd->resp_data_len=%d, "
+ "res=%d", cmd->is_send_status, cmd->resp_data_len, res);
+
+out:
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_block_generic_dev_done);
+
+/**
+ * scst_tape_generic_dev_done() - generic tape dev done
+ *
+ * Generic dev_done() for tape devices
+ */
+int scst_tape_generic_dev_done(struct scst_cmd *cmd,
+ void (*set_block_size)(struct scst_cmd *cmd, int block_shift))
+{
+ int opcode = cmd->cdb[0];
+ int res = SCST_CMD_STATE_DEFAULT;
+ int buffer_size, bs;
+ uint8_t *buffer = NULL;
+
+ /*
+ * SCST sets good defaults for cmd->is_send_status and
+ * cmd->resp_data_len based on cmd->status and cmd->data_direction,
+ * therefore change them only if necessary
+ */
+
+ switch (opcode) {
+ case MODE_SENSE:
+ case MODE_SELECT:
+ buffer_size = scst_get_buf_first(cmd, &buffer);
+ if (unlikely(buffer_size <= 0)) {
+ if (buffer_size < 0) {
+ PRINT_ERROR("%s: Unable to get the buffer (%d)",
+ __func__, buffer_size);
+ }
+ goto out;
+ }
+ break;
+ }
+
+ switch (opcode) {
+ case MODE_SENSE:
+ TRACE_DBG("%s", "MODE_SENSE");
+ if ((cmd->cdb[2] & 0xC0) == 0) {
+ if (buffer[3] == 8) {
+ bs = (buffer[9] << 16) |
+ (buffer[10] << 8) | buffer[11];
+ set_block_size(cmd, bs);
+ }
+ }
+ break;
+ case MODE_SELECT:
+ TRACE_DBG("%s", "MODE_SELECT");
+ if (buffer[3] == 8) {
+ bs = (buffer[9] << 16) | (buffer[10] << 8) |
+ (buffer[11]);
+ set_block_size(cmd, bs);
+ }
+ break;
+ default:
+ /* It's all good */
+ break;
+ }
+
+ switch (opcode) {
+ case MODE_SENSE:
+ case MODE_SELECT:
+ scst_put_buf(cmd, buffer);
+ break;
+ }
+
+out:
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_tape_generic_dev_done);
+
+static void scst_check_internal_sense(struct scst_device *dev, int result,
+ uint8_t *sense, int sense_len)
+{
+
+ if (host_byte(result) == DID_RESET) {
+ int sl;
+ TRACE(TRACE_MGMT, "DID_RESET received for device %s, "
+ "triggering reset UA", dev->virt_name);
+ sl = scst_set_sense(sense, sense_len, dev->d_sense,
+ SCST_LOAD_SENSE(scst_sense_reset_UA));
+ scst_dev_check_set_UA(dev, NULL, sense, sl);
+ } else if ((status_byte(result) == CHECK_CONDITION) &&
+ scst_is_ua_sense(sense, sense_len))
+ scst_dev_check_set_UA(dev, NULL, sense, sense_len);
+ return;
+}
+
+/**
+ * scst_to_dma_dir() - translate SCST's data direction to DMA direction
+ *
+ * Translates SCST's data direction to DMA one from backend storage
+ * perspective.
+ */
+enum dma_data_direction scst_to_dma_dir(int scst_dir)
+{
+ static const enum dma_data_direction tr_tbl[] = { DMA_NONE,
+ DMA_TO_DEVICE, DMA_FROM_DEVICE, DMA_BIDIRECTIONAL, DMA_NONE };
+
+ return tr_tbl[scst_dir];
+}
+EXPORT_SYMBOL(scst_to_dma_dir);
+
+/*
+ * scst_to_tgt_dma_dir() - translate SCST data direction to DMA direction
+ *
+ * Translates SCST data direction to DMA data direction from the perspective
+ * of the target device.
+ */
+enum dma_data_direction scst_to_tgt_dma_dir(int scst_dir)
+{
+ static const enum dma_data_direction tr_tbl[] = { DMA_NONE,
+ DMA_FROM_DEVICE, DMA_TO_DEVICE, DMA_BIDIRECTIONAL, DMA_NONE };
+
+ return tr_tbl[scst_dir];
+}
+EXPORT_SYMBOL(scst_to_tgt_dma_dir);
+
+/**
+ * scst_obtain_device_parameters() - obtain device control parameters
+ *
+ * Issues a MODE SENSE for control mode page data and sets the corresponding
+ * dev's parameter from it. Returns 0 on success and not 0 otherwise.
+ */
+int scst_obtain_device_parameters(struct scst_device *dev)
+{
+ int rc, i;
+ uint8_t cmd[16];
+ uint8_t buffer[4+0x0A];
+ uint8_t sense_buffer[SCSI_SENSE_BUFFERSIZE];
+
+ EXTRACHECKS_BUG_ON(dev->scsi_dev == NULL);
+
+ for (i = 0; i < 5; i++) {
+ /* Get control mode page */
+ memset(cmd, 0, sizeof(cmd));
+#if 0
+ cmd[0] = MODE_SENSE_10;
+ cmd[1] = 0;
+ cmd[2] = 0x0A;
+ cmd[8] = sizeof(buffer); /* it's < 256 */
+#else
+ cmd[0] = MODE_SENSE;
+ cmd[1] = 8; /* DBD */
+ cmd[2] = 0x0A;
+ cmd[4] = sizeof(buffer);
+#endif
+
+ memset(buffer, 0, sizeof(buffer));
+ memset(sense_buffer, 0, sizeof(sense_buffer));
+
+ TRACE(TRACE_SCSI, "%s", "Doing internal MODE_SENSE");
+ rc = scsi_execute(dev->scsi_dev, cmd, SCST_DATA_READ, buffer,
+ sizeof(buffer), sense_buffer, 15, 0, 0
+ , NULL
+ );
+
+ TRACE_DBG("MODE_SENSE done: %x", rc);
+
+ if (scsi_status_is_good(rc)) {
+ int q;
+
+ PRINT_BUFF_FLAG(TRACE_SCSI,
+ "Returned control mode page data",
+ buffer, sizeof(buffer));
+
+ dev->tst = buffer[4+2] >> 5;
+ q = buffer[4+3] >> 4;
+ if (q > SCST_CONTR_MODE_QUEUE_ALG_UNRESTRICTED_REORDER) {
+ PRINT_ERROR("Too big QUEUE ALG %x, dev %s",
+ dev->queue_alg, dev->virt_name);
+ }
+ dev->queue_alg = q;
+ dev->swp = (buffer[4+4] & 0x8) >> 3;
+ dev->tas = (buffer[4+5] & 0x40) >> 6;
+ dev->d_sense = (buffer[4+2] & 0x4) >> 2;
+
+ /*
+ * Unfortunately, SCSI ML doesn't provide a way to
+ * specify commands task attribute, so we can rely on
+ * device's restricted reordering only. Linux I/O
+ * subsystem doesn't reorder pass-through (PC) requests.
+ */
+ dev->has_own_order_mgmt = !dev->queue_alg;
+
+ PRINT_INFO("Device %s: TST %x, QUEUE ALG %x, SWP %x, "
+ "TAS %x, D_SENSE %d, has_own_order_mgmt %d",
+ dev->virt_name, dev->tst, dev->queue_alg,
+ dev->swp, dev->tas, dev->d_sense,
+ dev->has_own_order_mgmt);
+
+ goto out;
+ } else {
+ scst_check_internal_sense(dev, rc, sense_buffer,
+ sizeof(sense_buffer));
+#if 0
+ if ((status_byte(rc) == CHECK_CONDITION) &&
+ SCST_SENSE_VALID(sense_buffer)) {
+#else
+ /*
+ * 3ware controller is buggy and returns CONDITION_GOOD
+ * instead of CHECK_CONDITION
+ */
+ if (SCST_SENSE_VALID(sense_buffer)) {
+#endif
+ PRINT_BUFF_FLAG(TRACE_SCSI,
+ "Returned sense data",
+ sense_buffer, sizeof(sense_buffer));
+ if (scst_analyze_sense(sense_buffer,
+ sizeof(sense_buffer),
+ SCST_SENSE_KEY_VALID,
+ ILLEGAL_REQUEST, 0, 0)) {
+ PRINT_INFO("Device %s doesn't support "
+ "MODE SENSE", dev->virt_name);
+ break;
+ } else if (scst_analyze_sense(sense_buffer,
+ sizeof(sense_buffer),
+ SCST_SENSE_KEY_VALID,
+ NOT_READY, 0, 0)) {
+ PRINT_ERROR("Device %s not ready",
+ dev->virt_name);
+ break;
+ }
+ } else {
+ PRINT_INFO("Internal MODE SENSE to "
+ "device %s failed: %x",
+ dev->virt_name, rc);
+ PRINT_BUFF_FLAG(TRACE_SCSI, "MODE SENSE sense",
+ sense_buffer, sizeof(sense_buffer));
+ switch (host_byte(rc)) {
+ case DID_RESET:
+ case DID_ABORT:
+ case DID_SOFT_ERROR:
+ break;
+ default:
+ goto brk;
+ }
+ switch (driver_byte(rc)) {
+ case DRIVER_BUSY:
+ case DRIVER_SOFT:
+ break;
+ default:
+ goto brk;
+ }
+ }
+ }
+ }
+brk:
+ PRINT_WARNING("Unable to get device's %s control mode page, using "
+ "existing values/defaults: TST %x, QUEUE ALG %x, SWP %x, "
+ "TAS %x, D_SENSE %d, has_own_order_mgmt %d", dev->virt_name,
+ dev->tst, dev->queue_alg, dev->swp, dev->tas, dev->d_sense,
+ dev->has_own_order_mgmt);
+
+out:
+ return 0;
+}
+EXPORT_SYMBOL_GPL(scst_obtain_device_parameters);
+
+/* Called under dev_lock and BH off */
+void scst_process_reset(struct scst_device *dev,
+ struct scst_session *originator, struct scst_cmd *exclude_cmd,
+ struct scst_mgmt_cmd *mcmd, bool setUA)
+{
+ struct scst_tgt_dev *tgt_dev;
+ struct scst_cmd *cmd, *tcmd;
+
+ /* Clear RESERVE'ation, if necessary */
+ if (dev->dev_reserved) {
+ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ TRACE_MGMT_DBG("Clearing RESERVE'ation for "
+ "tgt_dev LUN %lld",
+ (long long unsigned int)tgt_dev->lun);
+ clear_bit(SCST_TGT_DEV_RESERVED,
+ &tgt_dev->tgt_dev_flags);
+ }
+ dev->dev_reserved = 0;
+ /*
+ * There is no need to send RELEASE, since the device is going
+ * to be resetted. Actually, since we can be in RESET TM
+ * function, it might be dangerous.
+ */
+ }
+
+ dev->dev_double_ua_possible = 1;
+
+ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ struct scst_session *sess = tgt_dev->sess;
+
+ spin_lock_bh(&tgt_dev->tgt_dev_lock);
+
+ scst_free_all_UA(tgt_dev);
+
+ memset(tgt_dev->tgt_dev_sense, 0,
+ sizeof(tgt_dev->tgt_dev_sense));
+
+ spin_unlock_bh(&tgt_dev->tgt_dev_lock);
+
+ spin_lock_irq(&sess->sess_list_lock);
+
+ TRACE_DBG("Searching in sess cmd list (sess=%p)", sess);
+ list_for_each_entry(cmd, &sess->sess_cmd_list,
+ sess_cmd_list_entry) {
+ if (cmd == exclude_cmd)
+ continue;
+ if ((cmd->tgt_dev == tgt_dev) ||
+ ((cmd->tgt_dev == NULL) &&
+ (cmd->lun == tgt_dev->lun))) {
+ scst_abort_cmd(cmd, mcmd,
+ (tgt_dev->sess != originator), 0);
+ }
+ }
+ spin_unlock_irq(&sess->sess_list_lock);
+ }
+
+ list_for_each_entry_safe(cmd, tcmd, &dev->blocked_cmd_list,
+ blocked_cmd_list_entry) {
+ if (test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) {
+ list_del(&cmd->blocked_cmd_list_entry);
+ TRACE_MGMT_DBG("Adding aborted blocked cmd %p "
+ "to active cmd list", cmd);
+ spin_lock_irq(&cmd->cmd_threads->cmd_list_lock);
+ list_add_tail(&cmd->cmd_list_entry,
+ &cmd->cmd_threads->active_cmd_list);
+ wake_up(&cmd->cmd_threads->cmd_list_waitQ);
+ spin_unlock_irq(&cmd->cmd_threads->cmd_list_lock);
+ }
+ }
+
+ if (setUA) {
+ uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
+ int sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
+ dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA));
+ scst_dev_check_set_local_UA(dev, exclude_cmd, sense_buffer, sl);
+ }
+ return;
+}
+
+/* No locks, no IRQ or IRQ-disabled context allowed */
+int scst_set_pending_UA(struct scst_cmd *cmd)
+{
+ int res = 0, i;
+ struct scst_tgt_dev_UA *UA_entry;
+ bool first = true, global_unlock = false;
+ struct scst_session *sess = cmd->sess;
+
+ TRACE_MGMT_DBG("Setting pending UA cmd %p", cmd);
+
+ spin_lock_bh(&cmd->tgt_dev->tgt_dev_lock);
+
+again:
+ /* UA list could be cleared behind us, so retest */
+ if (list_empty(&cmd->tgt_dev->UA_list)) {
+ TRACE_DBG("%s",
+ "SCST_TGT_DEV_UA_PENDING set, but UA_list empty");
+ res = -1;
+ goto out_unlock_tgt_dev_lock;
+ }
+
+ UA_entry = list_entry(cmd->tgt_dev->UA_list.next, typeof(*UA_entry),
+ UA_list_entry);
+
+ TRACE_DBG("next %p UA_entry %p",
+ cmd->tgt_dev->UA_list.next, UA_entry);
+
+ if (UA_entry->global_UA && first) {
+ TRACE_MGMT_DBG("Global UA %p detected", UA_entry);
+
+ spin_unlock_bh(&cmd->tgt_dev->tgt_dev_lock);
+
+ /*
+ * cmd won't allow to suspend activities, so we can access
+ * sess->sess_tgt_dev_list_hash without any additional
+ * protection.
+ */
+
+ local_bh_disable();
+
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[i];
+ struct scst_tgt_dev *tgt_dev;
+ list_for_each_entry(tgt_dev, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ /* Lockdep triggers here a false positive.. */
+ spin_lock(&tgt_dev->tgt_dev_lock);
+ }
+ }
+
+ first = false;
+ global_unlock = true;
+ goto again;
+ }
+
+ if (scst_set_cmd_error_sense(cmd, UA_entry->UA_sense_buffer,
+ UA_entry->UA_valid_sense_len) != 0)
+ goto out_unlock;
+
+ cmd->ua_ignore = 1;
+
+ list_del(&UA_entry->UA_list_entry);
+
+ if (UA_entry->global_UA) {
+ for (i = 0; i < TGT_DEV_HASH_SIZE; i++) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[i];
+ struct scst_tgt_dev *tgt_dev;
+
+ list_for_each_entry(tgt_dev, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ struct scst_tgt_dev_UA *ua;
+ list_for_each_entry(ua, &tgt_dev->UA_list,
+ UA_list_entry) {
+ if (ua->global_UA &&
+ memcmp(ua->UA_sense_buffer,
+ UA_entry->UA_sense_buffer,
+ sizeof(ua->UA_sense_buffer)) == 0) {
+ TRACE_MGMT_DBG("Freeing not "
+ "needed global UA %p",
+ ua);
+ list_del(&ua->UA_list_entry);
+ mempool_free(ua, scst_ua_mempool);
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ mempool_free(UA_entry, scst_ua_mempool);
+
+ if (list_empty(&cmd->tgt_dev->UA_list)) {
+ clear_bit(SCST_TGT_DEV_UA_PENDING,
+ &cmd->tgt_dev->tgt_dev_flags);
+ }
+
+out_unlock:
+ if (global_unlock) {
+ for (i = TGT_DEV_HASH_SIZE-1; i >= 0; i--) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[i];
+ struct scst_tgt_dev *tgt_dev;
+ list_for_each_entry_reverse(tgt_dev, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ spin_unlock(&tgt_dev->tgt_dev_lock);
+ }
+ }
+
+ local_bh_enable();
+ spin_lock_bh(&cmd->tgt_dev->tgt_dev_lock);
+ }
+
+out_unlock_tgt_dev_lock:
+ spin_unlock_bh(&cmd->tgt_dev->tgt_dev_lock);
+ return res;
+}
+
+/* Called under tgt_dev_lock and BH off */
+static void scst_alloc_set_UA(struct scst_tgt_dev *tgt_dev,
+ const uint8_t *sense, int sense_len, int flags)
+{
+ struct scst_tgt_dev_UA *UA_entry = NULL;
+
+ UA_entry = mempool_alloc(scst_ua_mempool, GFP_ATOMIC);
+ if (UA_entry == NULL) {
+ PRINT_CRIT_ERROR("%s", "UNIT ATTENTION memory "
+ "allocation failed. The UNIT ATTENTION "
+ "on some sessions will be missed");
+ PRINT_BUFFER("Lost UA", sense, sense_len);
+ goto out;
+ }
+ memset(UA_entry, 0, sizeof(*UA_entry));
+
+ UA_entry->global_UA = (flags & SCST_SET_UA_FLAG_GLOBAL) != 0;
+ if (UA_entry->global_UA)
+ TRACE_MGMT_DBG("Queuing global UA %p", UA_entry);
+
+ if (sense_len > (int)sizeof(UA_entry->UA_sense_buffer)) {
+ PRINT_WARNING("Sense truncated (needed %d), shall you increase "
+ "SCST_SENSE_BUFFERSIZE?", sense_len);
+ sense_len = sizeof(UA_entry->UA_sense_buffer);
+ }
+ memcpy(UA_entry->UA_sense_buffer, sense, sense_len);
+ UA_entry->UA_valid_sense_len = sense_len;
+
+ set_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags);
+
+ TRACE_MGMT_DBG("Adding new UA to tgt_dev %p", tgt_dev);
+
+ if (flags & SCST_SET_UA_FLAG_AT_HEAD)
+ list_add(&UA_entry->UA_list_entry, &tgt_dev->UA_list);
+ else
+ list_add_tail(&UA_entry->UA_list_entry, &tgt_dev->UA_list);
+
+out:
+ return;
+}
+
+/* tgt_dev_lock supposed to be held and BH off */
+static void __scst_check_set_UA(struct scst_tgt_dev *tgt_dev,
+ const uint8_t *sense, int sense_len, int flags)
+{
+ int skip_UA = 0;
+ struct scst_tgt_dev_UA *UA_entry_tmp;
+ int len = min((int)sizeof(UA_entry_tmp->UA_sense_buffer), sense_len);
+
+ list_for_each_entry(UA_entry_tmp, &tgt_dev->UA_list,
+ UA_list_entry) {
+ if (memcmp(sense, UA_entry_tmp->UA_sense_buffer, len) == 0) {
+ TRACE_MGMT_DBG("%s", "UA already exists");
+ skip_UA = 1;
+ break;
+ }
+ }
+
+ if (skip_UA == 0)
+ scst_alloc_set_UA(tgt_dev, sense, len, flags);
+ return;
+}
+
+void scst_check_set_UA(struct scst_tgt_dev *tgt_dev,
+ const uint8_t *sense, int sense_len, int flags)
+{
+
+ spin_lock_bh(&tgt_dev->tgt_dev_lock);
+ __scst_check_set_UA(tgt_dev, sense, sense_len, flags);
+ spin_unlock_bh(&tgt_dev->tgt_dev_lock);
+ return;
+}
+
+/* Called under dev_lock and BH off */
+void scst_dev_check_set_local_UA(struct scst_device *dev,
+ struct scst_cmd *exclude, const uint8_t *sense, int sense_len)
+{
+ struct scst_tgt_dev *tgt_dev, *exclude_tgt_dev = NULL;
+
+ if (exclude != NULL)
+ exclude_tgt_dev = exclude->tgt_dev;
+
+ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if (tgt_dev != exclude_tgt_dev)
+ scst_check_set_UA(tgt_dev, sense, sense_len, 0);
+ }
+ return;
+}
+
+/* Called under dev_lock and BH off */
+void __scst_dev_check_set_UA(struct scst_device *dev,
+ struct scst_cmd *exclude, const uint8_t *sense, int sense_len)
+{
+
+ TRACE_MGMT_DBG("Processing UA dev %p", dev);
+
+ /* Check for reset UA */
+ if (scst_analyze_sense(sense, sense_len, SCST_SENSE_ASC_VALID,
+ 0, SCST_SENSE_ASC_UA_RESET, 0))
+ scst_process_reset(dev,
+ (exclude != NULL) ? exclude->sess : NULL,
+ exclude, NULL, false);
+
+ scst_dev_check_set_local_UA(dev, exclude, sense, sense_len);
+ return;
+}
+
+/* Called under tgt_dev_lock or when tgt_dev is unused */
+static void scst_free_all_UA(struct scst_tgt_dev *tgt_dev)
+{
+ struct scst_tgt_dev_UA *UA_entry, *t;
+
+ list_for_each_entry_safe(UA_entry, t,
+ &tgt_dev->UA_list, UA_list_entry) {
+ TRACE_MGMT_DBG("Clearing UA for tgt_dev LUN %lld",
+ (long long unsigned int)tgt_dev->lun);
+ list_del(&UA_entry->UA_list_entry);
+ mempool_free(UA_entry, scst_ua_mempool);
+ }
+ INIT_LIST_HEAD(&tgt_dev->UA_list);
+ clear_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags);
+ return;
+}
+
+/* No locks */
+struct scst_cmd *__scst_check_deferred_commands(struct scst_tgt_dev *tgt_dev)
+{
+ struct scst_cmd *res = NULL, *cmd, *t;
+ typeof(tgt_dev->expected_sn) expected_sn = tgt_dev->expected_sn;
+
+ spin_lock_irq(&tgt_dev->sn_lock);
+
+ if (unlikely(tgt_dev->hq_cmd_count != 0))
+ goto out_unlock;
+
+restart:
+ list_for_each_entry_safe(cmd, t, &tgt_dev->deferred_cmd_list,
+ sn_cmd_list_entry) {
+ EXTRACHECKS_BUG_ON(cmd->queue_type ==
+ SCST_CMD_QUEUE_HEAD_OF_QUEUE);
+ if (cmd->sn == expected_sn) {
+ TRACE_SN("Deferred command %p (sn %d, set %d) found",
+ cmd, cmd->sn, cmd->sn_set);
+ tgt_dev->def_cmd_count--;
+ list_del(&cmd->sn_cmd_list_entry);
+ if (res == NULL)
+ res = cmd;
+ else {
+ spin_lock(&cmd->cmd_threads->cmd_list_lock);
+ TRACE_SN("Adding cmd %p to active cmd list",
+ cmd);
+ list_add_tail(&cmd->cmd_list_entry,
+ &cmd->cmd_threads->active_cmd_list);
+ wake_up(&cmd->cmd_threads->cmd_list_waitQ);
+ spin_unlock(&cmd->cmd_threads->cmd_list_lock);
+ }
+ }
+ }
+ if (res != NULL)
+ goto out_unlock;
+
+ list_for_each_entry(cmd, &tgt_dev->skipped_sn_list,
+ sn_cmd_list_entry) {
+ EXTRACHECKS_BUG_ON(cmd->queue_type ==
+ SCST_CMD_QUEUE_HEAD_OF_QUEUE);
+ if (cmd->sn == expected_sn) {
+ atomic_t *slot = cmd->sn_slot;
+ /*
+ * !! At this point any pointer in cmd, except !!
+ * !! sn_slot and sn_cmd_list_entry, could be !!
+ * !! already destroyed !!
+ */
+ TRACE_SN("cmd %p (tag %llu) with skipped sn %d found",
+ cmd,
+ (long long unsigned int)cmd->tag,
+ cmd->sn);
+ tgt_dev->def_cmd_count--;
+ list_del(&cmd->sn_cmd_list_entry);
+ spin_unlock_irq(&tgt_dev->sn_lock);
+ if (test_and_set_bit(SCST_CMD_CAN_BE_DESTROYED,
+ &cmd->cmd_flags))
+ scst_destroy_put_cmd(cmd);
+ scst_inc_expected_sn(tgt_dev, slot);
+ expected_sn = tgt_dev->expected_sn;
+ spin_lock_irq(&tgt_dev->sn_lock);
+ goto restart;
+ }
+ }
+
+out_unlock:
+ spin_unlock_irq(&tgt_dev->sn_lock);
+ return res;
+}
+
+/*****************************************************************
+ ** The following thr_data functions are necessary, because the
+ ** kernel doesn't provide a better way to have threads local
+ ** storage
+ *****************************************************************/
+
+/**
+ * scst_add_thr_data() - add the current thread's local data
+ *
+ * Adds local to the current thread data to tgt_dev
+ * (they will be local for the tgt_dev and current thread).
+ */
+void scst_add_thr_data(struct scst_tgt_dev *tgt_dev,
+ struct scst_thr_data_hdr *data,
+ void (*free_fn) (struct scst_thr_data_hdr *data))
+{
+ data->owner_thr = current;
+ atomic_set(&data->ref, 1);
+ EXTRACHECKS_BUG_ON(free_fn == NULL);
+ data->free_fn = free_fn;
+ spin_lock(&tgt_dev->thr_data_lock);
+ list_add_tail(&data->thr_data_list_entry, &tgt_dev->thr_data_list);
+ spin_unlock(&tgt_dev->thr_data_lock);
+}
+EXPORT_SYMBOL_GPL(scst_add_thr_data);
+
+/**
+ * scst_del_all_thr_data() - delete all thread's local data
+ *
+ * Deletes all local to threads data from tgt_dev
+ */
+void scst_del_all_thr_data(struct scst_tgt_dev *tgt_dev)
+{
+ spin_lock(&tgt_dev->thr_data_lock);
+ while (!list_empty(&tgt_dev->thr_data_list)) {
+ struct scst_thr_data_hdr *d = list_entry(
+ tgt_dev->thr_data_list.next, typeof(*d),
+ thr_data_list_entry);
+ list_del(&d->thr_data_list_entry);
+ spin_unlock(&tgt_dev->thr_data_lock);
+ scst_thr_data_put(d);
+ spin_lock(&tgt_dev->thr_data_lock);
+ }
+ spin_unlock(&tgt_dev->thr_data_lock);
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_del_all_thr_data);
+
+/**
+ * scst_dev_del_all_thr_data() - delete all thread's local data from device
+ *
+ * Deletes all local to threads data from all tgt_dev's of the device
+ */
+void scst_dev_del_all_thr_data(struct scst_device *dev)
+{
+ struct scst_tgt_dev *tgt_dev;
+
+ mutex_lock(&scst_mutex);
+
+ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ scst_del_all_thr_data(tgt_dev);
+ }
+
+ mutex_unlock(&scst_mutex);
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_dev_del_all_thr_data);
+
+/* thr_data_lock supposed to be held */
+static struct scst_thr_data_hdr *__scst_find_thr_data_locked(
+ struct scst_tgt_dev *tgt_dev, struct task_struct *tsk)
+{
+ struct scst_thr_data_hdr *res = NULL, *d;
+
+ list_for_each_entry(d, &tgt_dev->thr_data_list, thr_data_list_entry) {
+ if (d->owner_thr == tsk) {
+ res = d;
+ scst_thr_data_get(res);
+ break;
+ }
+ }
+ return res;
+}
+
+/**
+ * __scst_find_thr_data() - find local to the thread data
+ *
+ * Finds local to the thread data. Returns NULL, if they not found.
+ */
+struct scst_thr_data_hdr *__scst_find_thr_data(struct scst_tgt_dev *tgt_dev,
+ struct task_struct *tsk)
+{
+ struct scst_thr_data_hdr *res;
+
+ spin_lock(&tgt_dev->thr_data_lock);
+ res = __scst_find_thr_data_locked(tgt_dev, tsk);
+ spin_unlock(&tgt_dev->thr_data_lock);
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(__scst_find_thr_data);
+
+bool scst_del_thr_data(struct scst_tgt_dev *tgt_dev, struct task_struct *tsk)
+{
+ bool res;
+ struct scst_thr_data_hdr *td;
+
+ spin_lock(&tgt_dev->thr_data_lock);
+
+ td = __scst_find_thr_data_locked(tgt_dev, tsk);
+ if (td != NULL) {
+ list_del(&td->thr_data_list_entry);
+ res = true;
+ } else
+ res = false;
+
+ spin_unlock(&tgt_dev->thr_data_lock);
+
+ if (td != NULL) {
+ /* the find() fn also gets it */
+ scst_thr_data_put(td);
+ scst_thr_data_put(td);
+ }
+
+ return res;
+}
+
+/* dev_lock supposed to be held and BH disabled */
+void __scst_block_dev(struct scst_device *dev)
+{
+ dev->block_count++;
+ TRACE_MGMT_DBG("Device BLOCK(new %d), dev %p", dev->block_count, dev);
+}
+
+/* No locks */
+static void scst_block_dev(struct scst_device *dev, int outstanding)
+{
+ spin_lock_bh(&dev->dev_lock);
+ __scst_block_dev(dev);
+ spin_unlock_bh(&dev->dev_lock);
+
+ /*
+ * Memory barrier is necessary here, because we need to read
+ * on_dev_count in wait_event() below after we increased block_count.
+ * Otherwise, we can miss wake up in scst_dec_on_dev_cmd().
+ * We use the explicit barrier, because spin_unlock_bh() doesn't
+ * provide the necessary memory barrier functionality.
+ */
+ smp_mb();
+
+ TRACE_MGMT_DBG("Waiting during blocking outstanding %d (on_dev_count "
+ "%d)", outstanding, atomic_read(&dev->on_dev_count));
+ wait_event(dev->on_dev_waitQ,
+ atomic_read(&dev->on_dev_count) <= outstanding);
+ TRACE_MGMT_DBG("%s", "wait_event() returned");
+}
+
+/* No locks */
+void scst_block_dev_cmd(struct scst_cmd *cmd, int outstanding)
+{
+ BUG_ON(cmd->needs_unblocking);
+
+ cmd->needs_unblocking = 1;
+ TRACE_MGMT_DBG("Needs unblocking cmd %p (tag %llu)",
+ cmd, (long long unsigned int)cmd->tag);
+
+ scst_block_dev(cmd->dev, outstanding);
+}
+
+/* No locks */
+void scst_unblock_dev(struct scst_device *dev)
+{
+ spin_lock_bh(&dev->dev_lock);
+ TRACE_MGMT_DBG("Device UNBLOCK(new %d), dev %p",
+ dev->block_count-1, dev);
+ if (--dev->block_count == 0)
+ scst_unblock_cmds(dev);
+ spin_unlock_bh(&dev->dev_lock);
+ BUG_ON(dev->block_count < 0);
+}
+
+/* No locks */
+void scst_unblock_dev_cmd(struct scst_cmd *cmd)
+{
+ scst_unblock_dev(cmd->dev);
+ cmd->needs_unblocking = 0;
+}
+
+/* No locks */
+int scst_inc_on_dev_cmd(struct scst_cmd *cmd)
+{
+ int res = 0;
+ struct scst_device *dev = cmd->dev;
+
+ BUG_ON(cmd->inc_blocking || cmd->dec_on_dev_needed);
+
+ atomic_inc(&dev->on_dev_count);
+ cmd->dec_on_dev_needed = 1;
+ TRACE_DBG("New on_dev_count %d", atomic_read(&dev->on_dev_count));
+
+ if (unlikely(cmd->internal) && (cmd->cdb[0] == REQUEST_SENSE)) {
+ /*
+ * The original command can already block the device, so
+ * REQUEST SENSE command should always pass.
+ */
+ goto out;
+ }
+
+repeat:
+ if (unlikely(dev->block_count > 0)) {
+ spin_lock_bh(&dev->dev_lock);
+ if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)))
+ goto out_unlock;
+ if (dev->block_count > 0) {
+ scst_dec_on_dev_cmd(cmd);
+ TRACE_MGMT_DBG("Delaying cmd %p due to blocking "
+ "(tag %llu, dev %p)", cmd,
+ (long long unsigned int)cmd->tag, dev);
+ list_add_tail(&cmd->blocked_cmd_list_entry,
+ &dev->blocked_cmd_list);
+ res = 1;
+ spin_unlock_bh(&dev->dev_lock);
+ goto out;
+ } else {
+ TRACE_MGMT_DBG("%s", "Somebody unblocked the device, "
+ "continuing");
+ }
+ spin_unlock_bh(&dev->dev_lock);
+ }
+ if (unlikely(dev->dev_double_ua_possible)) {
+ spin_lock_bh(&dev->dev_lock);
+ if (dev->block_count == 0) {
+ TRACE_MGMT_DBG("cmd %p (tag %llu), blocking further "
+ "cmds due to possible double reset UA (dev %p)",
+ cmd, (long long unsigned int)cmd->tag, dev);
+ __scst_block_dev(dev);
+ cmd->inc_blocking = 1;
+ } else {
+ spin_unlock_bh(&dev->dev_lock);
+ TRACE_MGMT_DBG("Somebody blocked the device, "
+ "repeating (count %d)", dev->block_count);
+ goto repeat;
+ }
+ spin_unlock_bh(&dev->dev_lock);
+ }
+
+out:
+ return res;
+
+out_unlock:
+ spin_unlock_bh(&dev->dev_lock);
+ goto out;
+}
+
+/* Called under dev_lock */
+static void scst_unblock_cmds(struct scst_device *dev)
+{
+ struct scst_cmd *cmd, *tcmd;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ list_for_each_entry_safe(cmd, tcmd, &dev->blocked_cmd_list,
+ blocked_cmd_list_entry) {
+ list_del(&cmd->blocked_cmd_list_entry);
+ TRACE_MGMT_DBG("Adding blocked cmd %p to active cmd list", cmd);
+ spin_lock(&cmd->cmd_threads->cmd_list_lock);
+ if (unlikely(cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE))
+ list_add(&cmd->cmd_list_entry,
+ &cmd->cmd_threads->active_cmd_list);
+ else
+ list_add_tail(&cmd->cmd_list_entry,
+ &cmd->cmd_threads->active_cmd_list);
+ wake_up(&cmd->cmd_threads->cmd_list_waitQ);
+ spin_unlock(&cmd->cmd_threads->cmd_list_lock);
+ }
+ local_irq_restore(flags);
+ return;
+}
+
+static void __scst_unblock_deferred(struct scst_tgt_dev *tgt_dev,
+ struct scst_cmd *out_of_sn_cmd)
+{
+ EXTRACHECKS_BUG_ON(!out_of_sn_cmd->sn_set);
+
+ if (out_of_sn_cmd->sn == tgt_dev->expected_sn) {
+ scst_inc_expected_sn(tgt_dev, out_of_sn_cmd->sn_slot);
+ scst_make_deferred_commands_active(tgt_dev);
+ } else {
+ out_of_sn_cmd->out_of_sn = 1;
+ spin_lock_irq(&tgt_dev->sn_lock);
+ tgt_dev->def_cmd_count++;
+ list_add_tail(&out_of_sn_cmd->sn_cmd_list_entry,
+ &tgt_dev->skipped_sn_list);
+ TRACE_SN("out_of_sn_cmd %p with sn %d added to skipped_sn_list"
+ " (expected_sn %d)", out_of_sn_cmd, out_of_sn_cmd->sn,
+ tgt_dev->expected_sn);
+ spin_unlock_irq(&tgt_dev->sn_lock);
+ }
+
+ return;
+}
+
+void scst_unblock_deferred(struct scst_tgt_dev *tgt_dev,
+ struct scst_cmd *out_of_sn_cmd)
+{
+
+ if (!out_of_sn_cmd->sn_set) {
+ TRACE_SN("cmd %p without sn", out_of_sn_cmd);
+ goto out;
+ }
+
+ __scst_unblock_deferred(tgt_dev, out_of_sn_cmd);
+
+out:
+ return;
+}
+
+void scst_on_hq_cmd_response(struct scst_cmd *cmd)
+{
+ struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
+
+ if (!cmd->hq_cmd_inced)
+ goto out;
+
+ spin_lock_irq(&tgt_dev->sn_lock);
+ tgt_dev->hq_cmd_count--;
+ spin_unlock_irq(&tgt_dev->sn_lock);
+
+ EXTRACHECKS_BUG_ON(tgt_dev->hq_cmd_count < 0);
+
+ /*
+ * There is no problem in checking hq_cmd_count in the
+ * non-locked state. In the worst case we will only have
+ * unneeded run of the deferred commands.
+ */
+ if (tgt_dev->hq_cmd_count == 0)
+ scst_make_deferred_commands_active(tgt_dev);
+
+out:
+ return;
+}
+
+void scst_store_sense(struct scst_cmd *cmd)
+{
+
+ if (SCST_SENSE_VALID(cmd->sense) &&
+ !test_bit(SCST_CMD_NO_RESP, &cmd->cmd_flags) &&
+ (cmd->tgt_dev != NULL)) {
+ struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
+
+ TRACE_DBG("Storing sense (cmd %p)", cmd);
+
+ spin_lock_bh(&tgt_dev->tgt_dev_lock);
+
+ if (cmd->sense_valid_len <= sizeof(tgt_dev->tgt_dev_sense))
+ tgt_dev->tgt_dev_valid_sense_len = cmd->sense_valid_len;
+ else {
+ tgt_dev->tgt_dev_valid_sense_len = sizeof(tgt_dev->tgt_dev_sense);
+ PRINT_ERROR("Stored sense truncated to size %d "
+ "(needed %d)", tgt_dev->tgt_dev_valid_sense_len,
+ cmd->sense_valid_len);
+ }
+ memcpy(tgt_dev->tgt_dev_sense, cmd->sense,
+ tgt_dev->tgt_dev_valid_sense_len);
+
+ spin_unlock_bh(&tgt_dev->tgt_dev_lock);
+ }
+ return;
+}
+
+void scst_xmit_process_aborted_cmd(struct scst_cmd *cmd)
+{
+
+ TRACE_MGMT_DBG("Aborted cmd %p done (cmd_ref %d, "
+ "scst_cmd_count %d)", cmd, atomic_read(&cmd->cmd_ref),
+ atomic_read(&scst_cmd_count));
+
+ scst_done_cmd_mgmt(cmd);
+
+ if (test_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags)) {
+ if (cmd->completed) {
+ /* It's completed and it's OK to return its result */
+ goto out;
+ }
+
+ /* For not yet inited commands cmd->dev can be NULL here */
+ if (test_bit(SCST_CMD_DEVICE_TAS, &cmd->cmd_flags)) {
+ TRACE_MGMT_DBG("Flag ABORTED OTHER set for cmd %p "
+ "(tag %llu), returning TASK ABORTED ", cmd,
+ (long long unsigned int)cmd->tag);
+ scst_set_cmd_error_status(cmd, SAM_STAT_TASK_ABORTED);
+ } else {
+ TRACE_MGMT_DBG("Flag ABORTED OTHER set for cmd %p "
+ "(tag %llu), aborting without delivery or "
+ "notification",
+ cmd, (long long unsigned int)cmd->tag);
+ /*
+ * There is no need to check/requeue possible UA,
+ * because, if it exists, it will be delivered
+ * by the "completed" branch above.
+ */
+ clear_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags);
+ }
+ }
+
+out:
+ return;
+}
+
+/**
+ * scst_get_max_lun_commands() - return maximum supported commands count
+ *
+ * Returns maximum commands count which can be queued to this LUN in this
+ * session.
+ *
+ * If lun is NO_SUCH_LUN, returns minimum of maximum commands count which
+ * can be queued to any LUN in this session.
+ *
+ * If sess is NULL, returns minimum of maximum commands count which can be
+ * queued to any SCST device.
+ */
+int scst_get_max_lun_commands(struct scst_session *sess, uint64_t lun)
+{
+ return SCST_MAX_TGT_DEV_COMMANDS;
+}
+EXPORT_SYMBOL_GPL(scst_get_max_lun_commands);
+
+/**
+ * scst_get_next_lexem() - parse and return next lexem in the string
+ *
+ * Returns pointer to the next lexem from token_str skipping
+ * spaces and '=' character and using them then as a delimeter. Content
+ * of token_str is modified by setting '\0' at the delimeter's position.
+ */
+char *scst_get_next_lexem(char **token_str)
+{
+ char *p = *token_str;
+ char *q;
+ static const char blank = '\0';
+
+ if ((token_str == NULL) || (*token_str == NULL))
+ return (char *)␣
+
+ for (p = *token_str; (*p != '\0') && (isspace(*p) || (*p == '=')); p++)
+ ;
+
+ for (q = p; (*q != '\0') && !isspace(*q) && (*q != '='); q++)
+ ;
+
+ if (*q != '\0')
+ *q++ = '\0';
+
+ *token_str = q;
+ return p;
+}
+EXPORT_SYMBOL_GPL(scst_get_next_lexem);
+
+/**
+ * scst_restore_token_str() - restore string modified by scst_get_next_lexem()
+ *
+ * Restores token_str modified by scst_get_next_lexem() to the
+ * previous value before scst_get_next_lexem() was called. Prev_lexem is
+ * a pointer to lexem returned by scst_get_next_lexem().
+ */
+void scst_restore_token_str(char *prev_lexem, char *token_str)
+{
+ if (&prev_lexem[strlen(prev_lexem)] != token_str)
+ prev_lexem[strlen(prev_lexem)] = ' ';
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_restore_token_str);
+
+/**
+ * scst_get_next_token_str() - parse and return next token
+ *
+ * This function returns pointer to the next token strings from input_str
+ * using '\n', ';' and '\0' as a delimeter. Content of input_str is
+ * modified by setting '\0' at the delimeter's position.
+ */
+char *scst_get_next_token_str(char **input_str)
+{
+ char *p = *input_str;
+ int i = 0;
+
+ while ((p[i] != '\n') && (p[i] != ';') && (p[i] != '\0'))
+ i++;
+
+ if (i == 0)
+ return NULL;
+
+ if (p[i] == '\0')
+ *input_str = &p[i];
+ else
+ *input_str = &p[i+1];
+
+ p[i] = '\0';
+
+ return p;
+}
+EXPORT_SYMBOL_GPL(scst_get_next_token_str);
+
+static void __init scst_scsi_op_list_init(void)
+{
+ int i;
+ uint8_t op = 0xff;
+
+ for (i = 0; i < 256; i++)
+ scst_scsi_op_list[i] = SCST_CDB_TBL_SIZE;
+
+ for (i = 0; i < SCST_CDB_TBL_SIZE; i++) {
+ if (scst_scsi_op_table[i].ops != op) {
+ op = scst_scsi_op_table[i].ops;
+ scst_scsi_op_list[op] = i;
+ }
+ }
+ return;
+}
+
+int __init scst_lib_init(void)
+{
+ int res = 0;
+
+ scst_scsi_op_list_init();
+
+ scsi_io_context_cache = kmem_cache_create("scst_scsi_io_context",
+ sizeof(struct scsi_io_context),
+ 0, 0, NULL);
+ if (!scsi_io_context_cache) {
+ PRINT_ERROR("%s", "Can't init scsi io context cache");
+ res = -ENOMEM;
+ goto out;
+ }
+
+out:
+ return res;
+}
+
+void scst_lib_exit(void)
+{
+ BUILD_BUG_ON(SCST_MAX_CDB_SIZE != BLK_MAX_CDB);
+ BUILD_BUG_ON(SCST_SENSE_BUFFERSIZE < SCSI_SENSE_BUFFERSIZE);
+
+ kmem_cache_destroy(scsi_io_context_cache);
+}
+
+#ifdef CONFIG_SCST_DEBUG
+
+/**
+ * scst_random() - return a pseudo-random number for debugging purposes.
+ *
+ * Returns a pseudo-random number for debugging purposes. Available only in
+ * the DEBUG build.
+ *
+ * Original taken from the XFS code
+ */
+unsigned long scst_random(void)
+{
+ static int Inited;
+ static unsigned long RandomValue;
+ static DEFINE_SPINLOCK(lock);
+ /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
+ register long rv;
+ register long lo;
+ register long hi;
+ unsigned long flags;
+
+ spin_lock_irqsave(&lock, flags);
+ if (!Inited) {
+ RandomValue = jiffies;
+ Inited = 1;
+ }
+ rv = RandomValue;
+ hi = rv / 127773;
+ lo = rv % 127773;
+ rv = 16807 * lo - 2836 * hi;
+ if (rv <= 0)
+ rv += 2147483647;
+ RandomValue = rv;
+ spin_unlock_irqrestore(&lock, flags);
+ return rv;
+}
+EXPORT_SYMBOL_GPL(scst_random);
+#endif /* CONFIG_SCST_DEBUG */
+
+#ifdef CONFIG_SCST_DEBUG_TM
+
+#define TM_DBG_STATE_ABORT 0
+#define TM_DBG_STATE_RESET 1
+#define TM_DBG_STATE_OFFLINE 2
+
+#define INIT_TM_DBG_STATE TM_DBG_STATE_ABORT
+
+static void tm_dbg_timer_fn(unsigned long arg);
+
+static DEFINE_SPINLOCK(scst_tm_dbg_lock);
+/* All serialized by scst_tm_dbg_lock */
+static struct {
+ unsigned int tm_dbg_release:1;
+ unsigned int tm_dbg_blocked:1;
+} tm_dbg_flags;
+static LIST_HEAD(tm_dbg_delayed_cmd_list);
+static int tm_dbg_delayed_cmds_count;
+static int tm_dbg_passed_cmds_count;
+static int tm_dbg_state;
+static int tm_dbg_on_state_passes;
+static DEFINE_TIMER(tm_dbg_timer, tm_dbg_timer_fn, 0, 0);
+static struct scst_tgt_dev *tm_dbg_tgt_dev;
+
+static const int tm_dbg_on_state_num_passes[] = { 5, 1, 0x7ffffff };
+
+static void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev)
+{
+ if (tgt_dev->lun == 6) {
+ unsigned long flags;
+
+ if (tm_dbg_tgt_dev != NULL)
+ tm_dbg_deinit_tgt_dev(tm_dbg_tgt_dev);
+
+ spin_lock_irqsave(&scst_tm_dbg_lock, flags);
+ tm_dbg_state = INIT_TM_DBG_STATE;
+ tm_dbg_on_state_passes =
+ tm_dbg_on_state_num_passes[tm_dbg_state];
+ tm_dbg_tgt_dev = tgt_dev;
+ PRINT_INFO("LUN %lld connected from initiator %s is under "
+ "TM debugging (tgt_dev %p)",
+ (unsigned long long)tgt_dev->lun,
+ tgt_dev->sess->initiator_name, tgt_dev);
+ spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
+ }
+ return;
+}
+
+static void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev)
+{
+ if (tm_dbg_tgt_dev == tgt_dev) {
+ unsigned long flags;
+ TRACE_MGMT_DBG("Deinit TM debugging tgt_dev %p", tgt_dev);
+ del_timer_sync(&tm_dbg_timer);
+ spin_lock_irqsave(&scst_tm_dbg_lock, flags);
+ tm_dbg_tgt_dev = NULL;
+ spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
+ }
+ return;
+}
+
+static void tm_dbg_timer_fn(unsigned long arg)
+{
+ TRACE_MGMT_DBG("%s", "delayed cmd timer expired");
+ tm_dbg_flags.tm_dbg_release = 1;
+ /* Used to make sure that all woken up threads see the new value */
+ smp_wmb();
+ wake_up_all(&tm_dbg_tgt_dev->active_cmd_threads->cmd_list_waitQ);
+ return;
+}
+
+/* Called under scst_tm_dbg_lock and IRQs off */
+static void tm_dbg_delay_cmd(struct scst_cmd *cmd)
+{
+ switch (tm_dbg_state) {
+ case TM_DBG_STATE_ABORT:
+ if (tm_dbg_delayed_cmds_count == 0) {
+ unsigned long d = 58*HZ + (scst_random() % (4*HZ));
+ TRACE_MGMT_DBG("STATE ABORT: delaying cmd %p (tag %llu)"
+ " for %ld.%ld seconds (%ld HZ), "
+ "tm_dbg_on_state_passes=%d", cmd, cmd->tag,
+ d/HZ, (d%HZ)*100/HZ, d, tm_dbg_on_state_passes);
+ mod_timer(&tm_dbg_timer, jiffies + d);
+#if 0
+ tm_dbg_flags.tm_dbg_blocked = 1;
+#endif
+ } else {
+ TRACE_MGMT_DBG("Delaying another timed cmd %p "
+ "(tag %llu), delayed_cmds_count=%d, "
+ "tm_dbg_on_state_passes=%d", cmd, cmd->tag,
+ tm_dbg_delayed_cmds_count,
+ tm_dbg_on_state_passes);
+ if (tm_dbg_delayed_cmds_count == 2)
+ tm_dbg_flags.tm_dbg_blocked = 0;
+ }
+ break;
+
+ case TM_DBG_STATE_RESET:
+ case TM_DBG_STATE_OFFLINE:
+ TRACE_MGMT_DBG("STATE RESET/OFFLINE: delaying cmd %p "
+ "(tag %llu), delayed_cmds_count=%d, "
+ "tm_dbg_on_state_passes=%d", cmd, cmd->tag,
+ tm_dbg_delayed_cmds_count, tm_dbg_on_state_passes);
+ tm_dbg_flags.tm_dbg_blocked = 1;
+ break;
+
+ default:
+ BUG();
+ }
+ /* IRQs already off */
+ spin_lock(&cmd->cmd_threads->cmd_list_lock);
+ list_add_tail(&cmd->cmd_list_entry, &tm_dbg_delayed_cmd_list);
+ spin_unlock(&cmd->cmd_threads->cmd_list_lock);
+ cmd->tm_dbg_delayed = 1;
+ tm_dbg_delayed_cmds_count++;
+ return;
+}
+
+/* No locks */
+void tm_dbg_check_released_cmds(void)
+{
+ if (tm_dbg_flags.tm_dbg_release) {
+ struct scst_cmd *cmd, *tc;
+ spin_lock_irq(&scst_tm_dbg_lock);
+ list_for_each_entry_safe_reverse(cmd, tc,
+ &tm_dbg_delayed_cmd_list, cmd_list_entry) {
+ TRACE_MGMT_DBG("Releasing timed cmd %p (tag %llu), "
+ "delayed_cmds_count=%d", cmd, cmd->tag,
+ tm_dbg_delayed_cmds_count);
+ spin_lock(&cmd->cmd_threads->cmd_list_lock);
+ list_move(&cmd->cmd_list_entry,
+ &cmd->cmd_threads->active_cmd_list);
+ spin_unlock(&cmd->cmd_threads->cmd_list_lock);
+ }
+ tm_dbg_flags.tm_dbg_release = 0;
+ spin_unlock_irq(&scst_tm_dbg_lock);
+ }
+}
+
+/* Called under scst_tm_dbg_lock */
+static void tm_dbg_change_state(void)
+{
+ tm_dbg_flags.tm_dbg_blocked = 0;
+ if (--tm_dbg_on_state_passes == 0) {
+ switch (tm_dbg_state) {
+ case TM_DBG_STATE_ABORT:
+ TRACE_MGMT_DBG("%s", "Changing "
+ "tm_dbg_state to RESET");
+ tm_dbg_state = TM_DBG_STATE_RESET;
+ tm_dbg_flags.tm_dbg_blocked = 0;
+ break;
+ case TM_DBG_STATE_RESET:
+ case TM_DBG_STATE_OFFLINE:
+#ifdef CONFIG_SCST_TM_DBG_GO_OFFLINE
+ TRACE_MGMT_DBG("%s", "Changing "
+ "tm_dbg_state to OFFLINE");
+ tm_dbg_state = TM_DBG_STATE_OFFLINE;
+#else
+ TRACE_MGMT_DBG("%s", "Changing "
+ "tm_dbg_state to ABORT");
+ tm_dbg_state = TM_DBG_STATE_ABORT;
+#endif
+ break;
+ default:
+ BUG();
+ }
+ tm_dbg_on_state_passes =
+ tm_dbg_on_state_num_passes[tm_dbg_state];
+ }
+
+ TRACE_MGMT_DBG("%s", "Deleting timer");
+ del_timer_sync(&tm_dbg_timer);
+ return;
+}
+
+/* No locks */
+int tm_dbg_check_cmd(struct scst_cmd *cmd)
+{
+ int res = 0;
+ unsigned long flags;
+
+ if (cmd->tm_dbg_immut)
+ goto out;
+
+ if (cmd->tm_dbg_delayed) {
+ spin_lock_irqsave(&scst_tm_dbg_lock, flags);
+ TRACE_MGMT_DBG("Processing delayed cmd %p (tag %llu), "
+ "delayed_cmds_count=%d", cmd, cmd->tag,
+ tm_dbg_delayed_cmds_count);
+
+ cmd->tm_dbg_immut = 1;
+ tm_dbg_delayed_cmds_count--;
+ if ((tm_dbg_delayed_cmds_count == 0) &&
+ (tm_dbg_state == TM_DBG_STATE_ABORT))
+ tm_dbg_change_state();
+ spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
+ } else if (cmd->tgt_dev && (tm_dbg_tgt_dev == cmd->tgt_dev)) {
+ /* Delay 50th command */
+ spin_lock_irqsave(&scst_tm_dbg_lock, flags);
+ if (tm_dbg_flags.tm_dbg_blocked ||
+ (++tm_dbg_passed_cmds_count % 50) == 0) {
+ tm_dbg_delay_cmd(cmd);
+ res = 1;
+ } else
+ cmd->tm_dbg_immut = 1;
+ spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
+ }
+
+out:
+ return res;
+}
+
+/* No locks */
+void tm_dbg_release_cmd(struct scst_cmd *cmd)
+{
+ struct scst_cmd *c;
+ unsigned long flags;
+
+ spin_lock_irqsave(&scst_tm_dbg_lock, flags);
+ list_for_each_entry(c, &tm_dbg_delayed_cmd_list,
+ cmd_list_entry) {
+ if (c == cmd) {
+ TRACE_MGMT_DBG("Abort request for "
+ "delayed cmd %p (tag=%llu), moving it to "
+ "active cmd list (delayed_cmds_count=%d)",
+ c, c->tag, tm_dbg_delayed_cmds_count);
+
+ if (!test_bit(SCST_CMD_ABORTED_OTHER,
+ &cmd->cmd_flags)) {
+ /* Test how completed commands handled */
+ if (((scst_random() % 10) == 5)) {
+ scst_set_cmd_error(cmd,
+ SCST_LOAD_SENSE(
+ scst_sense_hardw_error));
+ /* It's completed now */
+ }
+ }
+
+ spin_lock(&cmd->cmd_threads->cmd_list_lock);
+ list_move(&c->cmd_list_entry,
+ &c->cmd_threads->active_cmd_list);
+ wake_up(&c->cmd_threads->cmd_list_waitQ);
+ spin_unlock(&cmd->cmd_threads->cmd_list_lock);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
+ return;
+}
+
+/* Might be called under scst_mutex */
+void tm_dbg_task_mgmt(struct scst_device *dev, const char *fn, int force)
+{
+ unsigned long flags;
+
+ if (dev != NULL) {
+ if (tm_dbg_tgt_dev == NULL)
+ goto out;
+
+ if (tm_dbg_tgt_dev->dev != dev)
+ goto out;
+ }
+
+ spin_lock_irqsave(&scst_tm_dbg_lock, flags);
+ if ((tm_dbg_state != TM_DBG_STATE_OFFLINE) || force) {
+ TRACE_MGMT_DBG("%s: freeing %d delayed cmds", fn,
+ tm_dbg_delayed_cmds_count);
+ tm_dbg_change_state();
+ tm_dbg_flags.tm_dbg_release = 1;
+ /*
+ * Used to make sure that all woken up threads see the new
+ * value.
+ */
+ smp_wmb();
+ if (tm_dbg_tgt_dev != NULL)
+ wake_up_all(&tm_dbg_tgt_dev->active_cmd_threads->cmd_list_waitQ);
+ } else {
+ TRACE_MGMT_DBG("%s: while OFFLINE state, doing nothing", fn);
+ }
+ spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
+
+out:
+ return;
+}
+
+int tm_dbg_is_release(void)
+{
+ return tm_dbg_flags.tm_dbg_release;
+}
+#endif /* CONFIG_SCST_DEBUG_TM */
+
+#ifdef CONFIG_SCST_DEBUG_SN
+void scst_check_debug_sn(struct scst_cmd *cmd)
+{
+ static DEFINE_SPINLOCK(lock);
+ static int type;
+ static int cnt;
+ unsigned long flags;
+ int old = cmd->queue_type;
+
+ spin_lock_irqsave(&lock, flags);
+
+ if (cnt == 0) {
+ if ((scst_random() % 1000) == 500) {
+ if ((scst_random() % 3) == 1)
+ type = SCST_CMD_QUEUE_HEAD_OF_QUEUE;
+ else
+ type = SCST_CMD_QUEUE_ORDERED;
+ do {
+ cnt = scst_random() % 10;
+ } while (cnt == 0);
+ } else
+ goto out_unlock;
+ }
+
+ cmd->queue_type = type;
+ cnt--;
+
+ if (((scst_random() % 1000) == 750))
+ cmd->queue_type = SCST_CMD_QUEUE_ORDERED;
+ else if (((scst_random() % 1000) == 751))
+ cmd->queue_type = SCST_CMD_QUEUE_HEAD_OF_QUEUE;
+ else if (((scst_random() % 1000) == 752))
+ cmd->queue_type = SCST_CMD_QUEUE_SIMPLE;
+
+ TRACE_SN("DbgSN changed cmd %p: %d/%d (cnt %d)", cmd, old,
+ cmd->queue_type, cnt);
+
+out_unlock:
+ spin_unlock_irqrestore(&lock, flags);
+ return;
+}
+#endif /* CONFIG_SCST_DEBUG_SN */
+
+#ifdef CONFIG_SCST_MEASURE_LATENCY
+
+static uint64_t scst_get_nsec(void)
+{
+ struct timespec ts;
+ ktime_get_ts(&ts);
+ return (uint64_t)ts.tv_sec * 1000000000 + ts.tv_nsec;
+}
+
+void scst_set_start_time(struct scst_cmd *cmd)
+{
+ cmd->start = scst_get_nsec();
+ TRACE_DBG("cmd %p: start %lld", cmd, cmd->start);
+}
+
+void scst_set_cur_start(struct scst_cmd *cmd)
+{
+ cmd->curr_start = scst_get_nsec();
+ TRACE_DBG("cmd %p: cur_start %lld", cmd, cmd->curr_start);
+}
+
+void scst_set_parse_time(struct scst_cmd *cmd)
+{
+ cmd->parse_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: parse_time %lld", cmd, cmd->parse_time);
+}
+
+void scst_set_alloc_buf_time(struct scst_cmd *cmd)
+{
+ cmd->alloc_buf_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: alloc_buf_time %lld", cmd, cmd->alloc_buf_time);
+}
+
+void scst_set_restart_waiting_time(struct scst_cmd *cmd)
+{
+ cmd->restart_waiting_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: restart_waiting_time %lld", cmd,
+ cmd->restart_waiting_time);
+}
+
+void scst_set_rdy_to_xfer_time(struct scst_cmd *cmd)
+{
+ cmd->rdy_to_xfer_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: rdy_to_xfer_time %lld", cmd, cmd->rdy_to_xfer_time);
+}
+
+void scst_set_pre_exec_time(struct scst_cmd *cmd)
+{
+ cmd->pre_exec_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: pre_exec_time %lld", cmd, cmd->pre_exec_time);
+}
+
+void scst_set_exec_time(struct scst_cmd *cmd)
+{
+ cmd->exec_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: exec_time %lld", cmd, cmd->exec_time);
+}
+
+void scst_set_dev_done_time(struct scst_cmd *cmd)
+{
+ cmd->dev_done_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: dev_done_time %lld", cmd, cmd->dev_done_time);
+}
+
+void scst_set_xmit_time(struct scst_cmd *cmd)
+{
+ cmd->xmit_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: xmit_time %lld", cmd, cmd->xmit_time);
+}
+
+void scst_set_tgt_on_free_time(struct scst_cmd *cmd)
+{
+ cmd->tgt_on_free_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: tgt_on_free_time %lld", cmd, cmd->tgt_on_free_time);
+}
+
+void scst_set_dev_on_free_time(struct scst_cmd *cmd)
+{
+ cmd->dev_on_free_time += scst_get_nsec() - cmd->curr_start;
+ TRACE_DBG("cmd %p: dev_on_free_time %lld", cmd, cmd->dev_on_free_time);
+}
+
+void scst_update_lat_stats(struct scst_cmd *cmd)
+{
+ uint64_t finish, scst_time, tgt_time, dev_time;
+ struct scst_session *sess = cmd->sess;
+ int data_len;
+ int i;
+ struct scst_ext_latency_stat *latency_stat, *dev_latency_stat;
+
+ finish = scst_get_nsec();
+
+ /* Determine the IO size for extended latency statistics */
+ data_len = cmd->bufflen;
+ i = SCST_LATENCY_STAT_INDEX_OTHER;
+ if (data_len <= SCST_IO_SIZE_THRESHOLD_SMALL)
+ i = SCST_LATENCY_STAT_INDEX_SMALL;
+ else if (data_len <= SCST_IO_SIZE_THRESHOLD_MEDIUM)
+ i = SCST_LATENCY_STAT_INDEX_MEDIUM;
+ else if (data_len <= SCST_IO_SIZE_THRESHOLD_LARGE)
+ i = SCST_LATENCY_STAT_INDEX_LARGE;
+ else if (data_len <= SCST_IO_SIZE_THRESHOLD_VERY_LARGE)
+ i = SCST_LATENCY_STAT_INDEX_VERY_LARGE;
+ latency_stat = &sess->sess_latency_stat[i];
+ dev_latency_stat = &cmd->tgt_dev->dev_latency_stat[i];
+
+ spin_lock_bh(&sess->lat_lock);
+
+ /* Calculate the latencies */
+ scst_time = finish - cmd->start - (cmd->parse_time +
+ cmd->alloc_buf_time + cmd->restart_waiting_time +
+ cmd->rdy_to_xfer_time + cmd->pre_exec_time +
+ cmd->exec_time + cmd->dev_done_time + cmd->xmit_time +
+ cmd->tgt_on_free_time + cmd->dev_on_free_time);
+ tgt_time = cmd->alloc_buf_time + cmd->restart_waiting_time +
+ cmd->rdy_to_xfer_time + cmd->pre_exec_time +
+ cmd->xmit_time + cmd->tgt_on_free_time;
+ dev_time = cmd->parse_time + cmd->exec_time + cmd->dev_done_time +
+ cmd->dev_on_free_time;
+
+ /* Save the basic latency information */
+ sess->scst_time += scst_time;
+ sess->tgt_time += tgt_time;
+ sess->dev_time += dev_time;
+ sess->processed_cmds++;
+
+ if ((sess->min_scst_time == 0) ||
+ (sess->min_scst_time > scst_time))
+ sess->min_scst_time = scst_time;
+ if ((sess->min_tgt_time == 0) ||
+ (sess->min_tgt_time > tgt_time))
+ sess->min_tgt_time = tgt_time;
+ if ((sess->min_dev_time == 0) ||
+ (sess->min_dev_time > dev_time))
+ sess->min_dev_time = dev_time;
+
+ if (sess->max_scst_time < scst_time)
+ sess->max_scst_time = scst_time;
+ if (sess->max_tgt_time < tgt_time)
+ sess->max_tgt_time = tgt_time;
+ if (sess->max_dev_time < dev_time)
+ sess->max_dev_time = dev_time;
+
+ /* Save the extended latency information */
+ if (cmd->data_direction & SCST_DATA_READ) {
+ latency_stat->scst_time_rd += scst_time;
+ latency_stat->tgt_time_rd += tgt_time;
+ latency_stat->dev_time_rd += dev_time;
+ latency_stat->processed_cmds_rd++;
+
+ if ((latency_stat->min_scst_time_rd == 0) ||
+ (latency_stat->min_scst_time_rd > scst_time))
+ latency_stat->min_scst_time_rd = scst_time;
+ if ((latency_stat->min_tgt_time_rd == 0) ||
+ (latency_stat->min_tgt_time_rd > tgt_time))
+ latency_stat->min_tgt_time_rd = tgt_time;
+ if ((latency_stat->min_dev_time_rd == 0) ||
+ (latency_stat->min_dev_time_rd > dev_time))
+ latency_stat->min_dev_time_rd = dev_time;
+
+ if (latency_stat->max_scst_time_rd < scst_time)
+ latency_stat->max_scst_time_rd = scst_time;
+ if (latency_stat->max_tgt_time_rd < tgt_time)
+ latency_stat->max_tgt_time_rd = tgt_time;
+ if (latency_stat->max_dev_time_rd < dev_time)
+ latency_stat->max_dev_time_rd = dev_time;
+
+ dev_latency_stat->scst_time_rd += scst_time;
+ dev_latency_stat->tgt_time_rd += tgt_time;
+ dev_latency_stat->dev_time_rd += dev_time;
+ dev_latency_stat->processed_cmds_rd++;
+
+ if ((dev_latency_stat->min_scst_time_rd == 0) ||
+ (dev_latency_stat->min_scst_time_rd > scst_time))
+ dev_latency_stat->min_scst_time_rd = scst_time;
+ if ((dev_latency_stat->min_tgt_time_rd == 0) ||
+ (dev_latency_stat->min_tgt_time_rd > tgt_time))
+ dev_latency_stat->min_tgt_time_rd = tgt_time;
+ if ((dev_latency_stat->min_dev_time_rd == 0) ||
+ (dev_latency_stat->min_dev_time_rd > dev_time))
+ dev_latency_stat->min_dev_time_rd = dev_time;
+
+ if (dev_latency_stat->max_scst_time_rd < scst_time)
+ dev_latency_stat->max_scst_time_rd = scst_time;
+ if (dev_latency_stat->max_tgt_time_rd < tgt_time)
+ dev_latency_stat->max_tgt_time_rd = tgt_time;
+ if (dev_latency_stat->max_dev_time_rd < dev_time)
+ dev_latency_stat->max_dev_time_rd = dev_time;
+ } else if (cmd->data_direction & SCST_DATA_WRITE) {
+ latency_stat->scst_time_wr += scst_time;
+ latency_stat->tgt_time_wr += tgt_time;
+ latency_stat->dev_time_wr += dev_time;
+ latency_stat->processed_cmds_wr++;
+
+ if ((latency_stat->min_scst_time_wr == 0) ||
+ (latency_stat->min_scst_time_wr > scst_time))
+ latency_stat->min_scst_time_wr = scst_time;
+ if ((latency_stat->min_tgt_time_wr == 0) ||
+ (latency_stat->min_tgt_time_wr > tgt_time))
+ latency_stat->min_tgt_time_wr = tgt_time;
+ if ((latency_stat->min_dev_time_wr == 0) ||
+ (latency_stat->min_dev_time_wr > dev_time))
+ latency_stat->min_dev_time_wr = dev_time;
+
+ if (latency_stat->max_scst_time_wr < scst_time)
+ latency_stat->max_scst_time_wr = scst_time;
+ if (latency_stat->max_tgt_time_wr < tgt_time)
+ latency_stat->max_tgt_time_wr = tgt_time;
+ if (latency_stat->max_dev_time_wr < dev_time)
+ latency_stat->max_dev_time_wr = dev_time;
+
+ dev_latency_stat->scst_time_wr += scst_time;
+ dev_latency_stat->tgt_time_wr += tgt_time;
+ dev_latency_stat->dev_time_wr += dev_time;
+ dev_latency_stat->processed_cmds_wr++;
+
+ if ((dev_latency_stat->min_scst_time_wr == 0) ||
+ (dev_latency_stat->min_scst_time_wr > scst_time))
+ dev_latency_stat->min_scst_time_wr = scst_time;
+ if ((dev_latency_stat->min_tgt_time_wr == 0) ||
+ (dev_latency_stat->min_tgt_time_wr > tgt_time))
+ dev_latency_stat->min_tgt_time_wr = tgt_time;
+ if ((dev_latency_stat->min_dev_time_wr == 0) ||
+ (dev_latency_stat->min_dev_time_wr > dev_time))
+ dev_latency_stat->min_dev_time_wr = dev_time;
+
+ if (dev_latency_stat->max_scst_time_wr < scst_time)
+ dev_latency_stat->max_scst_time_wr = scst_time;
+ if (dev_latency_stat->max_tgt_time_wr < tgt_time)
+ dev_latency_stat->max_tgt_time_wr = tgt_time;
+ if (dev_latency_stat->max_dev_time_wr < dev_time)
+ dev_latency_stat->max_dev_time_wr = dev_time;
+ }
+
+ spin_unlock_bh(&sess->lat_lock);
+
+ TRACE_DBG("cmd %p: finish %lld, scst_time %lld, "
+ "tgt_time %lld, dev_time %lld", cmd, finish, scst_time,
+ tgt_time, dev_time);
+ return;
+}
+
+#endif /* CONFIG_SCST_MEASURE_LATENCY */
--
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