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Date: Fri, 11 Sep 2009 18:57:08 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Greg KH <greg@...ah.com>,
Douglas Gilbert <dgilbert@...erlog.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Hannes Reinecke <hare@...e.de>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Joel Becker <joel.becker@...cle.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Christoph Hellwig <hch@....de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Alan Stern <stern@...land.harvard.edu>,
Boaz Harrosh <bharrosh@...asas.com>,
Florian Haas <florian.haas@...bit.com>,
Philipp Reisner <philipp.reisner@...bit.com>
Subject: [RFC PATCH 10/19] Target_Core_Mod PSCSI <-> Linux/SCSI subsystem
plugin
[RFC PATCH 10/19] Target_Core_Mod PSCSI <-> Linux/SCSI subsystem plugin
This patch adds the PSCSI subsystem plugin for accessing struct scsi_device
using struct request from upstream Linux/SCSI code in k.o v2.6.31
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
new file mode 100644
index 0000000..85a781b
--- /dev/null
+++ b/drivers/target/target_core_pscsi.c
@@ -0,0 +1,1677 @@
+/*******************************************************************************
+ * Filename: target_core_pscsi.c
+ *
+ * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.org>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+
+#define TARGET_CORE_PSCSI_C
+
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/genhd.h>
+#include <linux/cdrom.h>
+#include <linux/file.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <sd.h>
+#include <sr.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_pscsi.h>
+#include <target/target_core_plugin.h>
+#include <target/target_core_seobj.h>
+#include <target/target_core_transport_plugin.h>
+
+#undef TARGET_CORE_PSCSI_C
+
+#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
+
+/* pscsi_get_sh():
+ *
+ *
+ */
+static struct Scsi_Host *pscsi_get_sh(u32 host_no)
+{
+ struct Scsi_Host *sh = NULL;
+
+ sh = scsi_host_lookup(host_no);
+ if (IS_ERR(sh)) {
+ printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:"
+ " %u\n", host_no);
+ return NULL;
+ }
+
+ return sh;
+}
+
+/* pscsi_check_sd():
+ *
+ * Should be called with scsi_device_get(sd) held
+ */
+int pscsi_check_sd(struct scsi_device *sd)
+{
+ struct gendisk *disk;
+ struct scsi_disk *sdisk;
+
+ if (!sd) {
+ printk(KERN_ERR "struct scsi_device is NULL!\n");
+ return -1;
+ }
+
+ if (sd->type != TYPE_DISK)
+ return 0;
+
+ /*
+ * Some struct scsi_device of Type: Direct-Access, namely the
+ * SGI Univerisal Xport do not have a corrasponding block device.
+ * We skip these for now.
+ */
+ sdisk = dev_get_drvdata(&sd->sdev_gendev);
+ if (!(sdisk))
+ return -1;
+
+ disk = (struct gendisk *) sdisk->disk;
+ if (!(disk->major)) {
+ printk(KERN_ERR "dev_get_drvdata() failed\n");
+ return -1;
+ }
+
+ if (linux_blockdevice_check(disk->major, disk->first_minor) < 0)
+ return -1;
+
+ return 0;
+}
+
+/* pscsi_claim_sd():
+ *
+ * Should be called with scsi_device_get(sd) held
+ */
+int pscsi_claim_sd(struct scsi_device *sd)
+{
+ struct block_device *bdev;
+ struct gendisk *disk;
+ struct scsi_disk *sdisk;
+
+ if (!sd) {
+ printk(KERN_ERR "struct scsi_device is NULL!\n");
+ return -1;
+ }
+
+ if (sd->type != TYPE_DISK)
+ return 0;
+
+ /*
+ * Some struct scsi_device of Type: Direct-Access, namely the
+ * SGI Univerisal Xport do not have a corrasponding block device.
+ * We skip these for now.
+ */
+ sdisk = dev_get_drvdata(&sd->sdev_gendev);
+ if (!(sdisk))
+ return -1;
+
+ disk = (struct gendisk *) sdisk->disk;
+ if (!(disk->major)) {
+ printk(KERN_ERR "dev_get_drvdata() failed\n");
+ return -1;
+ }
+
+ printk(KERN_INFO "PSCSI: Claiming %p Major:Minor - %d:%d\n",
+ sd, disk->major, disk->first_minor);
+
+ bdev = linux_blockdevice_claim(disk->major, disk->first_minor,
+ (void *)sd);
+ if (!(bdev))
+ return -1;
+
+ return 0;
+}
+
+/* pscsi_release_sd()
+ *
+ * Should be called with scsi_device_get(sd) held
+ */
+int pscsi_release_sd(struct scsi_device *sd)
+{
+ struct gendisk *disk;
+ struct scsi_disk *sdisk;
+
+ if (!sd) {
+ printk(KERN_ERR "struct scsi_device is NULL!\n");
+ return -1;
+ }
+
+ if (sd->type != TYPE_DISK)
+ return 0;
+
+ /*
+ * Some struct scsi_device of Type: Direct-Access, namely the
+ * SGI Univerisal Xport do not have a corrasponding block device.
+ * We skip these for now.
+ */
+ sdisk = dev_get_drvdata(&sd->sdev_gendev);
+ if (!(sdisk))
+ return -1;
+
+ disk = (struct gendisk *) sdisk->disk;
+ if (!(disk->major)) {
+ printk(KERN_ERR "dev_get_drvdata() failed\n");
+ return -1;
+ }
+
+ printk(KERN_INFO "PSCSI: Releasing Major:Minor - %d:%d\n",
+ disk->major, disk->first_minor);
+
+ return linux_blockdevice_release(disk->major, disk->first_minor, NULL);
+}
+
+/* pscsi_attach_hba():
+ *
+ * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
+ * from the passed SCSI Host ID.
+ */
+int pscsi_attach_hba(se_hba_t *hba, u32 host_id)
+{
+ int hba_depth, max_sectors;
+ struct Scsi_Host *sh;
+
+ sh = pscsi_get_sh(host_id);
+ if (!(sh))
+ return -EINVAL;
+
+ max_sectors = sh->max_sectors;
+
+ /*
+ * Usually the SCSI LLD will use the hostt->can_queue value to define
+ * its HBA TCQ depth. Some other drivers (like 2.6 megaraid) don't set
+ * this at all and set sh->can_queue at runtime.
+ */
+ hba_depth = (sh->hostt->can_queue > sh->can_queue) ?
+ sh->hostt->can_queue : sh->can_queue;
+ atomic_set(&hba->left_queue_depth, hba_depth);
+ atomic_set(&hba->max_queue_depth, hba_depth);
+
+ hba->hba_ptr = (void *) sh;
+ hba->transport = &pscsi_template;
+
+ printk(KERN_INFO "CORE_HBA[%d] - %s SCSI HBA Driver %s on"
+ " Generic Target Core Stack %s\n", hba->hba_id,
+ PYX_ISCSI_VENDOR, PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
+ printk(KERN_INFO "CORE_HBA[%d] - %s\n", hba->hba_id, (sh->hostt->name) ?
+ (sh->hostt->name) : "Unknown");
+ printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic"
+ " Target Core with TCQ Depth: %d MaxSectors: %hu\n",
+ hba->hba_id, atomic_read(&hba->max_queue_depth), max_sectors);
+
+ return 0;
+}
+
+/* pscsi_detach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+int pscsi_detach_hba(se_hba_t *hba)
+{
+ struct Scsi_Host *scsi_host = (struct Scsi_Host *) hba->hba_ptr;
+
+ scsi_host_put(scsi_host);
+
+ printk(KERN_INFO "CORE_HBA[%d] - Detached SCSI HBA: %s from"
+ " Generic Target Core\n", hba->hba_id,
+ (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
+ "Unknown");
+
+ hba->hba_ptr = NULL;
+
+ return 0;
+}
+
+/* pscsi_add_device_to_list():
+ *
+ *
+ */
+se_device_t *pscsi_add_device_to_list(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ pscsi_dev_virt_t *pdv,
+ struct scsi_device *sd,
+ int dev_flags)
+{
+ se_device_t *dev;
+
+ /*
+ * Some pseudo SCSI HBAs do not fill in sector_size
+ * correctly. (See ide-scsi.c) So go ahead and setup sane
+ * values.
+ */
+ if (!sd->sector_size) {
+ switch (sd->type) {
+ case TYPE_DISK:
+ sd->sector_size = 512;
+ break;
+ case TYPE_ROM:
+ sd->sector_size = 2048;
+ break;
+ case TYPE_TAPE: /* The Tape may not be in the drive */
+ break;
+ case TYPE_MEDIUM_CHANGER: /* Control CDBs only */
+ break;
+ default:
+ printk(KERN_ERR "Unable to set sector_size for %d\n",
+ sd->type);
+ return NULL;
+ }
+
+ if (sd->sector_size) {
+ printk(KERN_ERR "Set broken SCSI Device"
+ " %d:%d:%d sector_size to %d\n", sd->channel,
+ sd->id, sd->lun, sd->sector_size);
+ }
+ }
+
+ if (!sd->queue_depth) {
+ sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
+
+ printk(KERN_ERR "Set broken SCSI Device %d:%d:%d"
+ " queue_depth to %d\n", sd->channel, sd->id,
+ sd->lun, sd->queue_depth);
+ }
+ /*
+ * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
+ * which has already been referenced with Linux SCSI code with
+ * scsi_device_get() in this file's pscsi_create_virtdevice().
+ *
+ * The passthrough operations called by the transport_add_device_*
+ * function below will require this pointer to be set for passthroug
+ * ops.
+ *
+ * For the shutdown case in pscsi_free_device(), this struct
+ * scsi_device reference is released with Linux SCSI code
+ * scsi_device_put() and the pdv->pdv_sd cleared.
+ */
+ pdv->pdv_sd = sd;
+
+ dev = transport_add_device_to_core_hba(hba, &pscsi_template,
+ se_dev, dev_flags, (void *)pdv);
+ if (!(dev)) {
+ pdv->pdv_sd = NULL;
+ return NULL;
+ }
+
+ /*
+ * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
+ */
+ if (sd->type == TYPE_TAPE) {
+ unsigned char *buf = NULL, cdb[SCSI_CDB_SIZE];
+ se_cmd_t *cmd;
+ u32 blocksize;
+
+ memset(cdb, 0, SCSI_CDB_SIZE);
+ cdb[0] = MODE_SENSE;
+ cdb[4] = 0x0c; /* 12 bytes */
+
+ cmd = transport_allocate_passthrough(&cdb[0],
+ SE_DIRECTION_READ, 0, NULL, 0, 12,
+ DEV_OBJ_API(dev), dev);
+ if (!(cmd)) {
+ printk(KERN_ERR "Unable to determine blocksize for"
+ " TYPE_TAPE\n");
+ goto out;
+ }
+
+ if (transport_generic_passthrough(cmd) < 0) {
+ printk(KERN_ERR "Unable to determine blocksize for"
+ " TYPE_TAPE\n");
+ goto out;
+ }
+
+ buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+ blocksize = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
+
+ /*
+ * If MODE_SENSE still returns zero, set the default value
+ * to 1024.
+ */
+ sd->sector_size = blocksize;
+ if (!(sd->sector_size))
+ sd->sector_size = 1024;
+
+ transport_passthrough_release(cmd);
+ }
+out:
+ return dev;
+}
+
+int pscsi_claim_phydevice(se_hba_t *hba, se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *)pdv->pdv_sd;
+
+ return pscsi_claim_sd(sd);
+}
+
+int pscsi_release_phydevice(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *)pdv->pdv_sd;
+
+ return pscsi_release_sd(sd);
+}
+
+void *pscsi_allocate_virtdevice(se_hba_t *hba, const char *name)
+{
+ pscsi_dev_virt_t *pdv;
+
+ pdv = kzalloc(sizeof(pscsi_dev_virt_t), GFP_KERNEL);
+ if (!(pdv)) {
+ printk(KERN_ERR "Unable to allocate memory for pscsi_dev_virt_t\n");
+ return NULL;
+ }
+ pdv->pdv_se_hba = hba;
+
+ printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name);
+ return (void *)pdv;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+se_device_t *pscsi_create_type_disk(
+ struct scsi_device *sd,
+ pscsi_dev_virt_t *pdv,
+ se_subsystem_dev_t *se_dev,
+ se_hba_t *hba)
+{
+ se_device_t *dev;
+ struct Scsi_Host *sh = sd->host;
+ u32 dev_flags = 0;
+
+ if (scsi_device_get(sd)) {
+ printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
+ sh->host_no, sd->channel, sd->id, sd->lun);
+ spin_unlock_irq(sh->host_lock);
+ return NULL;
+ }
+ spin_unlock_irq(sh->host_lock);
+
+ if (pscsi_check_sd(sd) < 0) {
+ scsi_device_put(sd);
+ printk(KERN_ERR "pscsi_check_sd() failed for %d:%d:%d:%d\n",
+ sh->host_no, sd->channel, sd->id, sd->lun);
+ return NULL;
+ }
+ if (!(pscsi_claim_sd(sd))) {
+ dev_flags |= DF_CLAIMED_BLOCKDEV;
+ dev_flags |= DF_PERSISTENT_CLAIMED_BLOCKDEV;
+ }
+ dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+ if (!(dev)) {
+ scsi_device_put(sd);
+ return NULL;
+ }
+ printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d\n",
+ sh->host_no, sd->channel, sd->id, sd->lun);
+
+ return dev;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+se_device_t *pscsi_create_type_rom(
+ struct scsi_device *sd,
+ pscsi_dev_virt_t *pdv,
+ se_subsystem_dev_t *se_dev,
+ se_hba_t *hba)
+{
+ se_device_t *dev;
+ struct Scsi_Host *sh = sd->host;
+ u32 dev_flags = 0;
+
+ if (scsi_device_get(sd)) {
+ printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
+ sh->host_no, sd->channel, sd->id, sd->lun);
+ spin_unlock_irq(sh->host_lock);
+ return NULL;
+ }
+ spin_unlock_irq(sh->host_lock);
+
+ dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+ if (!(dev)) {
+ scsi_device_put(sd);
+ return NULL;
+ }
+ printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d\n",
+ sh->host_no, scsi_device_type(sd->type), sd->channel,
+ sd->id, sd->lun);
+
+ return dev;
+}
+
+/*
+ *Called with struct Scsi_Host->host_lock called.
+ */
+se_device_t *pscsi_create_type_other(
+ struct scsi_device *sd,
+ pscsi_dev_virt_t *pdv,
+ se_subsystem_dev_t *se_dev,
+ se_hba_t *hba)
+{
+ se_device_t *dev;
+ struct Scsi_Host *sh = sd->host;
+ u32 dev_flags = 0;
+
+ spin_unlock_irq(sh->host_lock);
+ dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+ if (!(dev))
+ return NULL;
+
+ printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d\n",
+ sh->host_no, scsi_device_type(sd->type), sd->channel,
+ sd->id, sd->lun);
+
+ return dev;
+}
+
+se_device_t *pscsi_create_virtdevice(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ void *p)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *)p;
+ se_device_t *dev;
+ struct scsi_device *sd;
+ struct Scsi_Host *sh = (struct Scsi_Host *) hba->hba_ptr;
+
+ if (!(pdv)) {
+ printk(KERN_ERR "Unable to locate pscsi_dev_virt_t"
+ " parameter\n");
+ return NULL;
+ }
+
+ spin_lock_irq(sh->host_lock);
+ list_for_each_entry(sd, &sh->__devices, siblings) {
+ if ((pdv->pdv_channel_id != sd->channel) ||
+ (pdv->pdv_target_id != sd->id) ||
+ (pdv->pdv_lun_id != sd->lun))
+ continue;
+ /*
+ * Functions will release the held struct scsi_host->host_lock
+ * before calling calling pscsi_check_sd() and
+ * pscsi_add_device_to_list() to register struct scsi_device
+ * with target_core_mod.
+ */
+ switch (sd->type) {
+ case TYPE_DISK:
+ dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
+ break;
+ case TYPE_ROM:
+ dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
+ break;
+ default:
+ dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
+ break;
+ }
+ if (!(dev)) {
+ pdv->pdv_sd = NULL;
+ return NULL;
+ }
+ return dev;
+ }
+ spin_unlock_irq(sh->host_lock);
+
+ printk(KERN_ERR "Unable to locate %d:%d:%d:%d\n", sh->host_no,
+ pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
+
+ return NULL;
+}
+
+/* pscsi_activate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+int pscsi_activate_device(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ struct Scsi_Host *sh = sd->host;
+
+ printk(KERN_INFO "CORE_PSCSI[%d] - Activating Device with TCQ: %d at"
+ " SCSI Location (Channel/Target/LUN) %d/%d/%d\n", sh->host_no,
+ sd->queue_depth, sd->channel, sd->id, sd->lun);
+
+ return 0;
+}
+
+/* pscsi_deactivate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+void pscsi_deactivate_device(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ struct Scsi_Host *sh = sd->host;
+
+ printk(KERN_INFO "CORE_PSCSI[%d] - Deactivating Device with TCQ: %d at"
+ " SCSI Location (Channel/Target/LUN) %d/%d/%d\n", sh->host_no,
+ sd->queue_depth, sd->channel, sd->id, sd->lun);
+}
+
+/* pscsi_free_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+void pscsi_free_device(void *p)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) p;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ if (sd) {
+ if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
+ scsi_device_put(sd);
+
+ pdv->pdv_sd = NULL;
+ }
+
+ kfree(pdv);
+}
+
+/* pscsi_transport_complete():
+ *
+ *
+ */
+int pscsi_transport_complete(se_task_t *task)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) task->se_dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ int result;
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+ unsigned char *cdb = &pt->pscsi_cdb[0];
+
+ result = pt->pscsi_result;
+
+# ifdef LINUX_VPD_PAGE_CHECK
+ if ((cdb[0] == INQUIRY) && host_byte(result) == DID_OK) {
+ u32 len = 0;
+ unsigned char *dst = (unsigned char *)
+ T_TASK(task->task_se_cmd)->t_task_buf;
+ unsigned char buf[VPD_BUF_LEN], *iqn = NULL;
+ se_subsystem_dev_t *su_dev = TASK_DEV(task)->se_sub_dev;
+ se_hba_t *hba = task->se_dev->se_hba;
+
+ /*
+ * The Initiator port did not request VPD information.
+ */
+ if (!(cdb[1] & 0x1)) {
+ task->task_scsi_status = GOOD;
+ return 0;
+ }
+
+ /*
+ * Assume the SCSI Device did the right thing if an VPD length
+ * is provided in the INQUIRY response payload.
+ */
+ if (dst[3] != 0x00) {
+ su_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
+ su_dev->su_dev_flags &= ~SDF_EMULATED_VPD_UNIT_SERIAL;
+ task->task_scsi_status = GOOD;
+ return 0;
+ }
+
+ memset(buf, 0, VPD_BUF_LEN);
+ memset(dst, 0, task->task_size);
+ buf[0] = sd->type;
+
+ switch (cdb[2]) {
+ case 0x00:
+ buf[1] = 0x00;
+ buf[3] = 3;
+ buf[4] = 0x0;
+ buf[5] = 0x80;
+ buf[6] = 0x83;
+ len = 3;
+ break;
+ case 0x80:
+ buf[1] = 0x80;
+ if (su_dev->su_dev_flags &
+ SDF_EMULATED_VPD_UNIT_SERIAL)
+ len += sprintf((unsigned char *)&buf[4], "%s",
+ &su_dev->t10_wwn.unit_serial[0]);
+ else {
+ iqn = transport_get_iqn_sn();
+ len += sprintf((unsigned char *)&buf[4],
+ "%s:%u_%u_%u_%u", iqn, hba->hba_id,
+ sd->channel, sd->id, sd->lun);
+ }
+ buf[3] = len;
+ break;
+ case 0x83:
+ buf[1] = 0x83;
+ /* Start Identifier Page */
+ buf[4] = 0x2; /* ASCII */
+ buf[5] = 0x1;
+ buf[6] = 0x0;
+ len += sprintf((unsigned char *)&buf[8], "LIO-ORG");
+
+ if (su_dev->su_dev_flags &
+ SDF_EMULATED_VPD_UNIT_SERIAL) {
+ len += sprintf((unsigned char *)&buf[16],
+ "PSCSI:%s",
+ &su_dev->t10_wwn.unit_serial[0]);
+ } else {
+ iqn = transport_get_iqn_sn();
+ len += sprintf((unsigned char *)&buf[16],
+ "PSCSI:%s:%u_%u_%u_%u", iqn,
+ hba->hba_id, sd->channel,
+ sd->id, sd->lun);
+ }
+ buf[7] = len; /* Identifer Length */
+ len += 4;
+ buf[3] = len; /* Page Length */
+ break;
+ default:
+ break;
+ }
+
+ if ((len + 4) > task->task_size) {
+ printk(KERN_ERR "Inquiry VPD Length: %u larger than"
+ " req->sr_bufflen: %u\n", (len + 4),
+ task->task_size);
+ memcpy(dst, buf, task->task_size);
+ } else
+ memcpy(dst, buf, (len + 4));
+
+ /*
+ * Fake the GOOD SAM status here too.
+ */
+ task->task_scsi_status = GOOD;
+ return 0;
+ }
+
+# endif /* LINUX_VPD_PAGE_CHECK */
+
+ /*
+ * Hack to make sure that Write-Protect modepage is set if R/O mode is
+ * forced.
+ */
+ if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
+ (status_byte(result) << 1) == SAM_STAT_GOOD) {
+ if (!TASK_CMD(task)->se_deve)
+ goto after_mode_sense;
+
+ if (TASK_CMD(task)->se_deve->lun_flags &
+ TRANSPORT_LUNFLAGS_READ_ONLY) {
+ unsigned char *buf = (unsigned char *)
+ T_TASK(task->task_se_cmd)->t_task_buf;
+
+ if (cdb[0] == MODE_SENSE_10) {
+ if (!(buf[3] & 0x80))
+ buf[3] |= 0x80;
+ } else {
+ if (!(buf[2] & 0x80))
+ buf[2] |= 0x80;
+ }
+ }
+ }
+after_mode_sense:
+
+ if (sd->type != TYPE_TAPE)
+ goto after_mode_select;
+
+ /*
+ * Hack to correctly obtain the initiator requested blocksize for
+ * TYPE_TAPE. Since this value is dependent upon each tape media,
+ * struct scsi_device->sector_size will not contain the correct value
+ * by default, so we go ahead and set it so
+ * TRANSPORT(dev)->get_blockdev() returns the correct value to the
+ * storage engine.
+ */
+ if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
+ (status_byte(result) << 1) == SAM_STAT_GOOD) {
+ unsigned char *buf;
+ struct scatterlist *sg = task->task_sg;
+ u16 bdl;
+ u32 blocksize;
+
+ buf = sg_virt(&sg[0]);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to get buf for scatterlist\n");
+ goto after_mode_select;
+ }
+
+ if (cdb[0] == MODE_SELECT)
+ bdl = (buf[3]);
+ else
+ bdl = (buf[6] << 8) | (buf[7]);
+
+ if (!bdl)
+ goto after_mode_select;
+
+ if (cdb[0] == MODE_SELECT)
+ blocksize = (buf[9] << 16) | (buf[10] << 8) |
+ (buf[11]);
+ else
+ blocksize = (buf[13] << 16) | (buf[14] << 8) |
+ (buf[15]);
+
+ sd->sector_size = blocksize;
+ }
+after_mode_select:
+
+ if (status_byte(result) & CHECK_CONDITION)
+ return 1;
+
+ return 0;
+}
+
+/* pscsi_allocate_request(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+void *pscsi_allocate_request(
+ se_task_t *task,
+ se_device_t *dev)
+{
+ pscsi_plugin_task_t *pt;
+
+ pt = kzalloc(sizeof(pscsi_plugin_task_t), GFP_KERNEL);
+ if (!(pt)) {
+ printk(KERN_ERR "Unable to allocate pscsi_plugin_task_t\n");
+ return NULL;
+ }
+
+ return pt;
+}
+
+static inline void pscsi_blk_init_request(
+ se_task_t *task,
+ pscsi_plugin_task_t *pt)
+{
+ /*
+ * Defined as "scsi command" in include/linux/blkdev.h.
+ */
+ pt->pscsi_req->cmd_type = REQ_TYPE_BLOCK_PC;
+ /*
+ * Setup the done function pointer for struct request,
+ * also set the end_io_data pointer.to se_task_t.
+ */
+ pt->pscsi_req->end_io = pscsi_req_done;
+ pt->pscsi_req->end_io_data = (void *)task;
+ /*
+ * Load the referenced se_task_t's SCSI CDB into
+ * include/linux/blkdev.h:struct request->cmd
+ */
+ pt->pscsi_req->cmd_len = COMMAND_SIZE(pt->pscsi_cdb[0]);
+ memcpy(pt->pscsi_req->cmd, pt->pscsi_cdb, pt->pscsi_req->cmd_len);
+ /*
+ * Setup pointer for outgoing sense data.
+ */
+ pt->pscsi_req->sense = (void *)&pt->pscsi_sense[0];
+ pt->pscsi_req->sense_len = 0;
+}
+
+/*
+ * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
+*/
+static int pscsi_blk_get_request(se_task_t *task)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) task->se_dev->dev_ptr;
+
+ pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
+ (pt->pscsi_direction == DMA_TO_DEVICE), GFP_KERNEL);
+ if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) {
+ printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n",
+ IS_ERR(pt->pscsi_req));
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ /*
+ * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
+ * and setup rq callback, CDB and sense.
+ */
+ pscsi_blk_init_request(task, pt);
+ return 0;
+}
+
+/* pscsi_do_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+int pscsi_do_task(se_task_t *task)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) task->se_dev->dev_ptr;
+ struct gendisk *gd = NULL;
+ /*
+ * Grab pointer to struct gendisk for TYPE_DISK and TYPE_ROM
+ * cases (eg: cases where struct scsi_device has a backing
+ * struct block_device. Also set the struct request->timeout
+ * value based on peripheral device type (from SCSI).
+ */
+ if (pdv->pdv_sd->type == TYPE_DISK) {
+ struct scsi_disk *sdisk = dev_get_drvdata(
+ &pdv->pdv_sd->sdev_gendev);
+ gd = sdisk->disk;
+ pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
+ } else
+ pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
+
+ pt->pscsi_req->retries = PS_RETRY;
+ /*
+ * Queue the struct request into the struct scsi_device->request_queue.
+ */
+ blk_execute_rq_nowait(pdv->pdv_sd->request_queue, gd,
+ pt->pscsi_req, 1, pscsi_req_done);
+
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+/* pscsi_free_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+void pscsi_free_task(se_task_t *task)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *)task->transport_req;
+ /*
+ * We do not release the bio(s) here associated with this task, as
+ * this is handled by bio_put() and pscsi_bi_endio().
+ */
+ kfree(pt);
+}
+
+ssize_t pscsi_set_configfs_dev_params(se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ const char *page,
+ ssize_t count)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) se_dev->se_dev_su_ptr;
+ struct Scsi_Host *sh = (struct Scsi_Host *) hba->hba_ptr;
+ char *buf, *cur, *ptr, *ptr2;
+ unsigned long scsi_channel_id, scsi_target_id, scsi_lun_id;
+ int params = 0, ret;
+
+ buf = kzalloc(count, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate memory for temporary"
+ " buffer\n");
+ return -ENOMEM;
+ }
+ memcpy(buf, page, count);
+ cur = buf;
+
+ while (cur) {
+ ptr = strstr(cur, "=");
+ if (!(ptr))
+ goto out;
+
+ *ptr = '\0';
+ ptr++;
+
+ ptr2 = strstr(cur, "scsi_channel_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &scsi_channel_id);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtoul() failed for"
+ " scsi_channel_id=\n");
+ break;
+ }
+ pdv->pdv_channel_id = (int)scsi_channel_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel"
+ " ID: %d\n", sh->host_no, pdv->pdv_channel_id);
+ pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "scsi_target_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &scsi_target_id);
+ if (ret < 0) {
+ printk("strict_strtoul() failed for"
+ " strict_strtoul()\n");
+ break;
+ }
+ pdv->pdv_target_id = (int)scsi_target_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target"
+ " ID: %d\n", sh->host_no, pdv->pdv_target_id);
+ pdv->pdv_flags |= PDF_HAS_TARGET_ID;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "scsi_lun_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &scsi_lun_id);
+ if (ret < 0) {
+ printk("strict_strtoul() failed for"
+ " scsi_lun_id=\n");
+ break;
+ }
+ pdv->pdv_lun_id = (int)scsi_lun_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:"
+ " %d\n", sh->host_no, pdv->pdv_lun_id);
+ pdv->pdv_flags |= PDF_HAS_LUN_ID;
+ params++;
+ } else
+ cur = NULL;
+ }
+
+out:
+ kfree(buf);
+ return (params) ? count : -EINVAL;
+}
+
+ssize_t pscsi_check_configfs_dev_params(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) se_dev->se_dev_su_ptr;
+
+ if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
+ !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
+ !(pdv->pdv_flags & PDF_HAS_TARGET_ID)) {
+ printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and"
+ " scsi_lun_id= parameters\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+ssize_t pscsi_show_configfs_dev_params(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ char *page)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) se_dev->se_dev_su_ptr;
+ int bl = 0;
+
+ __pscsi_get_dev_info(pdv, page, &bl);
+ return (ssize_t)bl;
+}
+
+se_device_t *pscsi_create_virtdevice_from_fd(
+ se_subsystem_dev_t *se_dev,
+ const char *page)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) se_dev->se_dev_su_ptr;
+ se_device_t *dev = NULL;
+ se_hba_t *hba = se_dev->se_dev_hba;
+ struct block_device *bd = NULL;
+ struct file *filp;
+ struct gendisk *gd = NULL;
+ struct inode *inode;
+ struct scsi_device *sd = NULL;
+ struct Scsi_Host *sh = (struct Scsi_Host *)hba->hba_ptr;
+ char *p = (char *)page;
+ unsigned long long fd;
+ int ret;
+
+ ret = strict_strtoull(p, 0, (unsigned long long *)&fd);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtol() failed for fd\n");
+ return ERR_PTR(-EINVAL);
+ }
+ if ((fd < 3 || fd > 7)) {
+ printk(KERN_ERR "PSCSI: Illegal value of file descriptor:"
+ " %llu\n", fd);
+ return ERR_PTR(-EINVAL);
+ }
+ filp = fget(fd);
+ if (!(filp)) {
+ printk(KERN_ERR "PSCSI: Unable to fget() fd: %llu\n", fd);
+ return ERR_PTR(-EBADF);
+ }
+ inode = igrab(filp->f_mapping->host);
+ if (!(inode)) {
+ printk(KERN_ERR "PSCSI: Unable to locate struct inode for"
+ " struct block_device fd\n");
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ /*
+ * Look for struct scsi_device with a backing struct block_device.
+ *
+ * This means struct scsi_device->type == TYPE_DISK && TYPE_ROM.
+ */
+ if (S_ISBLK(inode->i_mode)) {
+ bd = I_BDEV(filp->f_mapping->host);
+ if (!(bd)) {
+ printk(KERN_ERR "PSCSI: Unable to locate struct"
+ " block_device from I_BDEV()\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ gd = bd->bd_disk;
+ if (!(gd)) {
+ printk(KERN_ERR "PSCSI: Unable to locate struct gendisk"
+ " from struct block_device\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ /*
+ * This struct gendisk->driver_fs() is marked as "// remove'
+ * in include/linux/genhd.h..
+ *
+ * Currently in drivers/scsi/s[d,r].c:s[d,r]_probe(), this
+ * pointer gets set by struct scsi_device->sdev_gendev.
+ *
+ * Is there a better way to locate struct scsi_device from
+ * struct inode..?
+ */
+ if (!(gd->driverfs_dev)) {
+ printk(KERN_ERR "PSCSI: struct gendisk->driverfs_dev"
+ " is NULL!\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ sd = to_scsi_device(gd->driverfs_dev);
+ if (!(sd)) {
+ printk(KERN_ERR "PSCSI: Unable to locate struct"
+ " scsi_device from struct gendisk->"
+ "driverfs_dev\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ if (sd->host != sh) {
+ printk(KERN_ERR "PSCSI: Trying to attach scsi_device"
+ " Host ID: %d, but se_hba_t has SCSI Host ID:"
+ " %d\n", sd->host->host_no, sh->host_no);
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ /*
+ * pscsi_create_type_[disk,rom]() will release host_lock..
+ */
+ spin_lock_irq(sh->host_lock);
+ switch (sd->type) {
+ case TYPE_DISK:
+ dev = pscsi_create_type_disk(sd, pdv, se_dev,
+ se_dev->se_dev_hba);
+ break;
+ case TYPE_ROM:
+ dev = pscsi_create_type_rom(sd, pdv, se_dev,
+ se_dev->se_dev_hba);
+ break;
+ default:
+ printk(KERN_ERR "PSCSI: Unable to handle type S_ISBLK()"
+ " == TRUE Type: %s\n",
+ scsi_device_type(sd->type));
+ spin_unlock_irq(sh->host_lock);
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-ENOSYS);
+ }
+ } else if (S_ISCHR(inode->i_mode)) {
+ /*
+ * FIXME: Figure how to get struct scsi_device from character
+ * device's struct inode.
+ */
+ printk(KERN_ERR "SCSI Character Device unsupported via"
+ " configfs/fd method. Use configfs/control"
+ " instead\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-ENOSYS);
+ } else {
+ printk(KERN_ERR "PSCSI: File destriptor is not SCSI block or"
+ " character device, ignoring\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-ENODEV);
+ }
+
+ iput(inode);
+ fput(filp);
+ return dev;
+}
+
+void pscsi_get_plugin_info(void *p, char *b, int *bl)
+{
+ *bl += sprintf(b + *bl, "%s SCSI Plugin %s\n",
+ PYX_ISCSI_VENDOR, PSCSI_VERSION);
+}
+
+void pscsi_get_hba_info(se_hba_t *hba, char *b, int *bl)
+{
+ struct Scsi_Host *sh = (struct Scsi_Host *) hba->hba_ptr;
+
+ *bl += sprintf(b + *bl, "Core Host ID: %u SCSI Host ID: %u\n",
+ hba->hba_id, sh->host_no);
+ *bl += sprintf(b + *bl, " SCSI HBA: %s <local>\n",
+ (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
+}
+
+void pscsi_get_dev_info(se_device_t *dev, char *b, int *bl)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+
+ __pscsi_get_dev_info(pdv, b, bl);
+}
+
+void __pscsi_get_dev_info(pscsi_dev_virt_t *pdv, char *b, int *bl)
+{
+ int i;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ *bl += sprintf(b + *bl, "SCSI Device Bus Location:"
+ " Channel ID: %d Target ID: %d LUN: %d\n",
+ pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
+
+ if (sd) {
+ *bl += sprintf(b + *bl, " ");
+ *bl += sprintf(b + *bl, "Vendor: ");
+ for (i = 0; i < 8; i++) {
+ if (ISPRINT(sd->vendor[i])) /* printable character? */
+ *bl += sprintf(b + *bl, "%c", sd->vendor[i]);
+ else
+ *bl += sprintf(b + *bl, " ");
+ }
+ *bl += sprintf(b + *bl, " Model: ");
+ for (i = 0; i < 16; i++) {
+ if (ISPRINT(sd->model[i])) /* printable character ? */
+ *bl += sprintf(b + *bl, "%c", sd->model[i]);
+ else
+ *bl += sprintf(b + *bl, " ");
+ }
+ *bl += sprintf(b + *bl, " Rev: ");
+ for (i = 0; i < 4; i++) {
+ if (ISPRINT(sd->rev[i])) /* printable character ? */
+ *bl += sprintf(b + *bl, "%c", sd->rev[i]);
+ else
+ *bl += sprintf(b + *bl, " ");
+ }
+
+ if (sd->type == TYPE_DISK) {
+ struct scsi_disk *sdisk =
+ dev_get_drvdata(&sd->sdev_gendev);
+ struct gendisk *disk = (struct gendisk *) sdisk->disk;
+ struct block_device *bdev = bdget(MKDEV(disk->major,
+ disk->first_minor));
+
+ bdev->bd_disk = disk;
+ *bl += sprintf(b + *bl, " %s\n", (!bdev->bd_holder) ?
+ "" : (bdev->bd_holder ==
+ (struct scsi_device *)sd) ?
+ "CLAIMED: PSCSI" : "CLAIMED: OS");
+ } else
+ *bl += sprintf(b + *bl, "\n");
+ }
+
+ return;
+}
+
+static void pscsi_bi_endio(struct bio *bio, int error)
+{
+ bio_put(bio);
+}
+
+static inline struct bio *pscsi_get_bio(pscsi_dev_virt_t *pdv, int sg_num)
+{
+ struct bio *bio;
+ /*
+ * Use bio_malloc() following the comment in for bio -> struct request
+ * in block/blk-core.c:blk_make_request()
+ */
+ bio = bio_kmalloc(GFP_KERNEL, sg_num);
+ if (!(bio)) {
+ printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n");
+ return NULL;
+ }
+ bio->bi_end_io = pscsi_bi_endio;
+
+ return bio;
+}
+
+#if 0
+#define DEBUG_PSCSI(x...) printk(x)
+#else
+#define DEBUG_PSCSI(x...)
+#endif
+
+/* pscsi_map_task_SG():
+ *
+ *
+ */
+int pscsi_map_task_SG(se_task_t *task)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) task->se_dev->dev_ptr;
+ struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
+ struct page *page;
+ struct scatterlist *sg;
+ u32 data_len = task->task_size, i, len, bytes, off;
+ int nr_pages = (task->task_size + task->task_sg[0].offset +
+ PAGE_SIZE - 1) >> PAGE_SHIFT;
+ int nr_vecs = 0, ret = 0;
+ int rw = (TASK_CMD(task)->data_direction == SE_DIRECTION_WRITE);
+
+ if (!task->task_size)
+ return 0;
+ /*
+ * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
+ * the bio_vec maplist from LIO-SE se_mem_t -> task->task_sg ->
+ * struct scatterlist memory. The se_task_t->task_sg[] currently needs
+ * to be attached to struct bios for submission to Linux/SCSI using
+ * struct request to struct scsi_device->request_queue.
+ *
+ * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
+ * is ported to upstream SCSI passthrough functionality that accepts
+ * struct scatterlist->page_link or struct page as a paraemeter.
+ */
+ DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages);
+
+ for_each_sg(task->task_sg, sg, task->task_sg_num, i) {
+ page = sg_page(sg);
+ off = sg->offset;
+ len = sg->length;
+
+ DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i,
+ page, len, off);
+
+ while (len > 0 && data_len > 0) {
+ bytes = min_t(unsigned int, len, PAGE_SIZE - off);
+ bytes = min(bytes, data_len);
+
+ if (!(bio)) {
+ nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
+ nr_pages -= nr_vecs;
+ /*
+ * Calls bio_kmalloc() and sets bio->bi_end_io()
+ */
+ bio = pscsi_get_bio(pdv, nr_vecs);
+ if (!(bio))
+ goto fail;
+ /*
+ * FIXME: Use bio_set_dir() when avaliable
+ */
+ if (rw)
+ bio->bi_rw |= (1 << BIO_RW);
+
+ DEBUG_PSCSI("PSCSI: Allocated bio: %p,"
+ " dir: %s nr_vecs: %d\n", bio,
+ (rw) ? "rw" : "r", nr_vecs);
+ /*
+ * Set *hbio pointer to handle the case:
+ * nr_pages > BIO_MAX_PAGES, where additional
+ * bios need to be added to complete a given
+ * se_task_t
+ */
+ if (!hbio)
+ hbio = tbio = bio;
+ else
+ tbio = tbio->bi_next = bio;
+ }
+
+ DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d"
+ " bio: %p page: %p len: %d off: %d\n", i, bio,
+ page, len, off);
+
+ ret = bio_add_pc_page(pdv->pdv_sd->request_queue,
+ bio, page, bytes, off);
+ if (ret != bytes)
+ goto fail;
+
+ DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
+ bio->bi_vcnt, nr_vecs);
+
+ if (bio->bi_vcnt > nr_vecs) {
+ DEBUG_PSCSI("PSCSI: Reached bio->bi_vcnt max:"
+ " %d i: %d bio: %p, allocating another"
+ " bio\n", bio->bi_vcnt, i, bio);
+ /*
+ * Clear the pointer so that another bio will
+ * be allocated with pscsi_get_bio() above, the
+ * current bio has already been set *tbio and
+ * bio->bi_next.
+ */
+ bio = NULL;
+ }
+
+ page++;
+ len -= bytes;
+ data_len -= bytes;
+ off = 0;
+ }
+ }
+ /*
+ * Starting with v2.6.31, call blk_make_request() passing in *hbio to
+ * allocate the pSCSI task a struct request.
+ */
+ pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
+ hbio, GFP_KERNEL);
+ if (!(pt->pscsi_req)) {
+ printk(KERN_ERR "pSCSI: blk_make_request() failed\n");
+ goto fail;
+ }
+ /*
+ * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
+ * and setup rq callback, CDB and sense.
+ */
+ pscsi_blk_init_request(task, pt);
+
+ return task->task_sg_num;
+fail:
+ while (hbio) {
+ bio = hbio;
+ hbio = hbio->bi_next;
+ bio->bi_next = NULL;
+ bio_endio(bio, 0);
+ }
+ return ret;
+}
+
+/* pscsi_map_task_non_SG():
+ *
+ *
+ */
+int pscsi_map_task_non_SG(se_task_t *task)
+{
+ se_cmd_t *cmd = TASK_CMD(task);
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) task->se_dev->dev_ptr;
+ int ret = 0;
+
+ if (!task->task_size)
+ return 0;
+
+ ret = blk_rq_map_kern(pdv->pdv_sd->request_queue,
+ pt->pscsi_req, T_TASK(cmd)->t_task_buf,
+ task->task_size, GFP_KERNEL);
+ if (ret < 0) {
+ printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret);
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ return 0;
+}
+
+/* pscsi_CDB_inquiry():
+ *
+ *
+ */
+int pscsi_CDB_inquiry(se_task_t *task, u32 size)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ pt->pscsi_direction = DMA_FROM_DEVICE;
+ if (pscsi_blk_get_request(task) < 0)
+ return -1;
+
+ return pscsi_map_task_non_SG(task);
+}
+
+int pscsi_CDB_none(se_task_t *task, u32 size)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ pt->pscsi_direction = DMA_NONE;
+
+ return pscsi_blk_get_request(task);
+}
+
+/* pscsi_CDB_read_non_SG():
+ *
+ *
+ */
+int pscsi_CDB_read_non_SG(se_task_t *task, u32 size)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ pt->pscsi_direction = DMA_FROM_DEVICE;
+
+ if (pscsi_blk_get_request(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return pscsi_map_task_non_SG(task);
+}
+
+/* pscsi_CDB_read_SG():
+ *
+ *
+ */
+int pscsi_CDB_read_SG(se_task_t *task, u32 size)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ pt->pscsi_direction = DMA_FROM_DEVICE;
+ /*
+ * pscsi_map_task_SG() calls block/blk-core.c:blk_make_request()
+ * for >= v2.6.31 pSCSI
+ */
+ if (pscsi_map_task_SG(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return task->task_sg_num;
+}
+
+/* pscsi_CDB_write_non_SG():
+ *
+ *
+ */
+int pscsi_CDB_write_non_SG(se_task_t *task, u32 size)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ pt->pscsi_direction = DMA_TO_DEVICE;
+
+ if (pscsi_blk_get_request(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return pscsi_map_task_non_SG(task);
+}
+
+/* pscsi_CDB_write_SG():
+ *
+ *
+ */
+int pscsi_CDB_write_SG(se_task_t *task, u32 size)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ pt->pscsi_direction = DMA_TO_DEVICE;
+ /*
+ * pscsi_map_task_SG() calls block/blk-core.c:blk_make_request()
+ * for >= v2.6.31 pSCSI
+ */
+ if (pscsi_map_task_SG(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return task->task_sg_num;
+}
+
+/* pscsi_check_lba():
+ *
+ *
+ */
+int pscsi_check_lba(unsigned long long lba, se_device_t *dev)
+{
+ return 0;
+}
+
+/* pscsi_check_for_SG():
+ *
+ *
+ */
+int pscsi_check_for_SG(se_task_t *task)
+{
+ return task->task_sg_num;
+}
+
+/* pscsi_get_cdb():
+ *
+ *
+ */
+unsigned char *pscsi_get_cdb(se_task_t *task)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ return pt->pscsi_cdb;
+}
+
+/* pscsi_get_sense_buffer():
+ *
+ *
+ */
+unsigned char *pscsi_get_sense_buffer(se_task_t *task)
+{
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *) task->transport_req;
+
+ return (unsigned char *)&pt->pscsi_sense[0];
+}
+
+/* pscsi_get_blocksize():
+ *
+ *
+ */
+u32 pscsi_get_blocksize(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return sd->sector_size;
+}
+
+/* pscsi_get_device_rev():
+ *
+ *
+ */
+u32 pscsi_get_device_rev(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
+}
+
+/* pscsi_get_device_type():
+ *
+ *
+ */
+u32 pscsi_get_device_type(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return sd->type;
+}
+
+/* pscsi_get_dma_length():
+ *
+ *
+ */
+u32 pscsi_get_dma_length(u32 task_size, se_device_t *dev)
+{
+ return PAGE_SIZE;
+}
+
+/* pscsi_get_max_sectors():
+ *
+ *
+ */
+u32 pscsi_get_max_sectors(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return (sd->host->max_sectors > sd->request_queue->limits.max_sectors) ?
+ sd->request_queue->limits.max_sectors : sd->host->max_sectors;
+}
+
+/* pscsi_get_queue_depth():
+ *
+ *
+ */
+u32 pscsi_get_queue_depth(se_device_t *dev)
+{
+ pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return sd->queue_depth;
+}
+
+/* pscsi_handle_SAM_STATUS_failures():
+ *
+ *
+ */
+static inline void pscsi_process_SAM_status(
+ se_task_t *task,
+ pscsi_plugin_task_t *pt)
+{
+ task->task_scsi_status = status_byte(pt->pscsi_result);
+ if ((task->task_scsi_status)) {
+ task->task_scsi_status <<= 1;
+ printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:"
+ " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
+ pt->pscsi_result);
+ }
+
+ switch (host_byte(pt->pscsi_result)) {
+ case DID_OK:
+ transport_complete_task(task, (!task->task_scsi_status));
+ break;
+ default:
+ printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:"
+ " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
+ pt->pscsi_result);
+ task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
+ task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ TASK_CMD(task)->transport_error_status =
+ PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ transport_complete_task(task, 0);
+ break;
+ }
+
+ return;
+}
+
+void pscsi_req_done(struct request *req, int uptodate)
+{
+ se_task_t *task = (se_task_t *)req->end_io_data;
+ pscsi_plugin_task_t *pt = (pscsi_plugin_task_t *)task->transport_req;
+
+ pt->pscsi_result = req->errors;
+ pt->pscsi_resid = req->resid_len;
+
+ pscsi_process_SAM_status(task, pt);
+ __blk_put_request(req->q, req);
+ pt->pscsi_req = NULL;
+}
diff --git a/include/target/target_core_pscsi.h b/include/target/target_core_pscsi.h
new file mode 100644
index 0000000..da1d618
--- /dev/null
+++ b/include/target/target_core_pscsi.h
@@ -0,0 +1,186 @@
+/*******************************************************************************
+ * Filename: target_core_pscsi.h
+ *
+ * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
+ * specific definitions and prototypes.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.org>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+
+#ifndef TARGET_CORE_PSCSI_H
+#define TARGET_CORE_PSCSI_H
+
+#define PSCSI_VERSION "v3.1"
+
+/* used in pscsi_find_alloc_len() */
+#ifndef INQUIRY_DATA_SIZE
+#define INQUIRY_DATA_SIZE 0x24
+#endif
+
+/* used in pscsi_add_device_to_list() */
+#define PSCSI_DEFAULT_QUEUEDEPTH 1
+
+#define PS_RETRY 5
+#define PS_TIMEOUT_DISK (15*HZ)
+#define PS_TIMEOUT_OTHER (500*HZ)
+
+extern se_global_t *se_global;
+extern struct block_device *linux_blockdevice_claim(int, int, void *);
+extern int linux_blockdevice_release(int, int, struct block_device *);
+extern int linux_blockdevice_check(int, int);
+
+extern int pscsi_CDB_inquiry(se_task_t *, u32);
+extern int pscsi_CDB_none(se_task_t *, u32);
+extern int pscsi_CDB_read_non_SG(se_task_t *, u32);
+extern int pscsi_CDB_read_SG(se_task_t *, u32);
+extern int pscsi_CDB_write_non_SG(se_task_t *, u32);
+extern int pscsi_CDB_write_SG(se_task_t *, u32);
+
+#ifndef PSCSI_INCLUDE_STRUCTS
+extern int pscsi_attach_hba(se_hba_t *, u32);
+extern int pscsi_detach_hba(se_hba_t *);
+extern int pscsi_claim_phydevice(se_hba_t *, se_device_t *);
+extern int pscsi_release_phydevice(se_device_t *);
+extern void *pscsi_allocate_virtdevice(se_hba_t *, const char *);
+extern se_device_t *pscsi_create_virtdevice(se_hba_t *, se_subsystem_dev_t *,
+ void *);
+extern int pscsi_activate_device(se_device_t *);
+extern void pscsi_deactivate_device(se_device_t *);
+extern void pscsi_free_device(void *);
+extern int pscsi_transport_complete(se_task_t *);
+extern void *pscsi_allocate_request(se_task_t *, se_device_t *);
+extern int pscsi_do_task(se_task_t *);
+extern void pscsi_free_task(se_task_t *);
+extern ssize_t pscsi_set_configfs_dev_params(se_hba_t *, se_subsystem_dev_t *,
+ const char *, ssize_t);
+extern ssize_t pscsi_check_configfs_dev_params(se_hba_t *,
+ se_subsystem_dev_t *);
+extern ssize_t pscsi_show_configfs_dev_params(se_hba_t *, se_subsystem_dev_t *,
+ char *);
+extern se_device_t *pscsi_create_virtdevice_from_fd(se_subsystem_dev_t *,
+ const char *);
+extern void pscsi_get_plugin_info(void *, char *, int *);
+extern void pscsi_get_hba_info(se_hba_t *, char *, int *);
+extern void pscsi_get_dev_info(se_device_t *, char *, int *);
+extern int pscsi_check_lba(unsigned long long, se_device_t *);
+extern int pscsi_check_for_SG(se_task_t *);
+extern unsigned char *pscsi_get_cdb(se_task_t *);
+extern unsigned char *pscsi_get_sense_buffer(se_task_t *);
+extern u32 pscsi_get_blocksize(se_device_t *);
+extern u32 pscsi_get_device_rev(se_device_t *);
+extern u32 pscsi_get_device_type(se_device_t *);
+extern u32 pscsi_get_dma_length(u32, se_device_t *);
+extern u32 pscsi_get_max_sectors(se_device_t *);
+extern u32 pscsi_get_queue_depth(se_device_t *);
+extern void pscsi_req_done(struct request *, int);
+#endif
+
+#include <linux/device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_device.h>
+#include <linux/kref.h>
+#include <linux/kobject.h>
+
+typedef struct pscsi_plugin_task_s {
+ unsigned char pscsi_cdb[SCSI_CDB_SIZE];
+ unsigned char pscsi_sense[SCSI_SENSE_BUFFERSIZE];
+ int pscsi_direction;
+ int pscsi_result;
+ u32 pscsi_resid;
+ struct request *pscsi_req;
+} pscsi_plugin_task_t;
+
+#define PDF_HAS_CHANNEL_ID 0x01
+#define PDF_HAS_TARGET_ID 0x02
+#define PDF_HAS_LUN_ID 0x04
+#define PDF_HAS_VPD_UNIT_SERIAL 0x08
+#define PDF_HAS_VPD_DEV_IDENT 0x10
+
+typedef struct pscsi_dev_virt_s {
+ int pdv_flags;
+ int pdv_channel_id;
+ int pdv_target_id;
+ int pdv_lun_id;
+ struct scsi_device *pdv_sd;
+ struct se_hba_s *pdv_se_hba;
+} pscsi_dev_virt_t;
+
+extern void __pscsi_get_dev_info(pscsi_dev_virt_t *, char *, int *);
+
+/*
+ * We use the generic command sequencer, so we must setup
+ * se_subsystem_spc_t.
+ */
+#ifndef PSCSI_INCLUDE_STRUCTS
+
+se_subsystem_spc_t pscsi_template_spc = {
+ .inquiry = pscsi_CDB_inquiry,
+ .none = pscsi_CDB_none,
+ .read_non_SG = pscsi_CDB_read_non_SG,
+ .read_SG = pscsi_CDB_read_SG,
+ .write_non_SG = pscsi_CDB_write_non_SG,
+ .write_SG = pscsi_CDB_write_SG,
+};
+
+se_subsystem_api_t pscsi_template = {
+ .name = "pscsi", \
+ .type = PSCSI, \
+ .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, \
+ .attach_hba = pscsi_attach_hba, \
+ .detach_hba = pscsi_detach_hba, \
+ .activate_device = pscsi_activate_device, \
+ .deactivate_device = pscsi_deactivate_device, \
+ .claim_phydevice = pscsi_claim_phydevice, \
+ .allocate_virtdevice = pscsi_allocate_virtdevice, \
+ .create_virtdevice = pscsi_create_virtdevice, \
+ .free_device = pscsi_free_device, \
+ .release_phydevice = pscsi_release_phydevice, \
+ .transport_complete = pscsi_transport_complete, \
+ .allocate_request = pscsi_allocate_request, \
+ .do_task = pscsi_do_task, \
+ .free_task = pscsi_free_task, \
+ .check_configfs_dev_params = pscsi_check_configfs_dev_params, \
+ .set_configfs_dev_params = pscsi_set_configfs_dev_params, \
+ .show_configfs_dev_params = pscsi_show_configfs_dev_params, \
+ .create_virtdevice_from_fd = pscsi_create_virtdevice_from_fd, \
+ .get_plugin_info = pscsi_get_plugin_info, \
+ .get_hba_info = pscsi_get_hba_info, \
+ .get_dev_info = pscsi_get_dev_info, \
+ .check_lba = pscsi_check_lba, \
+ .check_for_SG = pscsi_check_for_SG, \
+ .get_cdb = pscsi_get_cdb, \
+ .get_sense_buffer = pscsi_get_sense_buffer, \
+ .get_blocksize = pscsi_get_blocksize, \
+ .get_device_rev = pscsi_get_device_rev, \
+ .get_device_type = pscsi_get_device_type, \
+ .get_dma_length = pscsi_get_dma_length, \
+ .get_max_sectors = pscsi_get_max_sectors, \
+ .get_queue_depth = pscsi_get_queue_depth, \
+ .write_pending = NULL, \
+ .spc = &pscsi_template_spc, \
+};
+
+#endif
+
+#endif /*** TARGET_CORE_PSCSI_H ***/
--
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