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Message-Id: <1318660132-21529-1-git-send-email-kys@microsoft.com>
Date: Fri, 14 Oct 2011 23:28:52 -0700
From: "K. Y. Srinivasan" <kys@...rosoft.com>
To: gregkh@...e.de, linux-kernel@...r.kernel.org,
devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
ohering@...e.com, jbottomley@...allels.com,
linux-scsi@...r.kernel.org, hch@...radead.org
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 1/1] Staging: hv: storvsc: Move the storage driver out of staging
In preparation for moving the storage driver out of staging, seek community
review of the storage driver code.
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
drivers/scsi/Kconfig | 7 +
drivers/scsi/Makefile | 3 +
drivers/scsi/storvsc_drv.c | 1480 ++++++++++++++++++++++++++++++++++++++
drivers/staging/hv/Kconfig | 6 -
drivers/staging/hv/Makefile | 2 -
drivers/staging/hv/storvsc_drv.c | 1480 --------------------------------------
6 files changed, 1490 insertions(+), 1488 deletions(-)
create mode 100644 drivers/scsi/storvsc_drv.c
delete mode 100644 drivers/staging/hv/storvsc_drv.c
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 8d9dae8..d5a640f 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -666,6 +666,13 @@ config VMWARE_PVSCSI
To compile this driver as a module, choose M here: the
module will be called vmw_pvscsi.
+config HYPERV_STORAGE
+ tristate "Microsoft Hyper-V virtual storage driver"
+ depends on SCSI && HYPERV
+ default HYPERV
+ help
+ Select this option to enable the Hyper-V virtual storage driver.
+
config LIBFC
tristate "LibFC module"
select SCSI_FC_ATTRS
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 3c08f53..8d8cf3a 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -141,6 +141,7 @@ obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/
obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/
obj-$(CONFIG_SCSI_PMCRAID) += pmcraid.o
obj-$(CONFIG_VMWARE_PVSCSI) += vmw_pvscsi.o
+obj-$(CONFIG_HYPERV_STORAGE) += hv_storvsc.o
obj-$(CONFIG_ARM) += arm/
@@ -169,6 +170,8 @@ scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
scsi_mod-y += scsi_trace.o
scsi_mod-$(CONFIG_PM) += scsi_pm.o
+hv_storvsc-y := storvsc_drv.o
+
scsi_tgt-y += scsi_tgt_lib.o scsi_tgt_if.o
sd_mod-objs := sd.o
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
new file mode 100644
index 0000000..ae8c33e
--- /dev/null
+++ b/drivers/scsi/storvsc_drv.c
@@ -0,0 +1,1480 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@...rosoft.com>
+ * Hank Janssen <hjanssen@...rosoft.com>
+ * K. Y. Srinivasan <kys@...rosoft.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/hyperv.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_devinfo.h>
+#include <scsi/scsi_dbg.h>
+
+
+#define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
+static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
+
+module_param(storvsc_ringbuffer_size, int, S_IRUGO);
+MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
+
+/* to alert the user that structure sizes may be mismatched even though the */
+/* protocol versions match. */
+
+
+#define REVISION_STRING(REVISION_) #REVISION_
+#define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \
+ do { \
+ char *revision_string \
+ = REVISION_STRING($Rev : 6 $) + 6; \
+ RESULT_LVALUE_ = 0; \
+ while (*revision_string >= '0' \
+ && *revision_string <= '9') { \
+ RESULT_LVALUE_ *= 10; \
+ RESULT_LVALUE_ += *revision_string - '0'; \
+ revision_string++; \
+ } \
+ } while (0)
+
+/* Major/minor macros. Minor version is in LSB, meaning that earlier flat */
+/* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */
+#define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff)
+#define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff)
+#define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
+ (((MINOR_) & 0xff)))
+#define VMSTOR_INVALID_PROTOCOL_VERSION (-1)
+
+/* Version history: */
+/* V1 Beta 0.1 */
+/* V1 RC < 2008/1/31 1.0 */
+/* V1 RC > 2008/1/31 2.0 */
+#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
+
+
+
+
+/* This will get replaced with the max transfer length that is possible on */
+/* the host adapter. */
+/* The max transfer length will be published when we offer a vmbus channel. */
+#define MAX_TRANSFER_LENGTH 0x40000
+#define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \
+ sizeof(struct vstor_packet) + \
+ sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
+
+
+/* Packet structure describing virtual storage requests. */
+enum vstor_packet_operation {
+ VSTOR_OPERATION_COMPLETE_IO = 1,
+ VSTOR_OPERATION_REMOVE_DEVICE = 2,
+ VSTOR_OPERATION_EXECUTE_SRB = 3,
+ VSTOR_OPERATION_RESET_LUN = 4,
+ VSTOR_OPERATION_RESET_ADAPTER = 5,
+ VSTOR_OPERATION_RESET_BUS = 6,
+ VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
+ VSTOR_OPERATION_END_INITIALIZATION = 8,
+ VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
+ VSTOR_OPERATION_QUERY_PROPERTIES = 10,
+ VSTOR_OPERATION_MAXIMUM = 10
+};
+
+/*
+ * Platform neutral description of a scsi request -
+ * this remains the same across the write regardless of 32/64 bit
+ * note: it's patterned off the SCSI_PASS_THROUGH structure
+ */
+#define CDB16GENERIC_LENGTH 0x10
+
+#ifndef SENSE_BUFFER_SIZE
+#define SENSE_BUFFER_SIZE 0x12
+#endif
+
+#define MAX_DATA_BUF_LEN_WITH_PADDING 0x14
+
+struct vmscsi_request {
+ unsigned short length;
+ unsigned char srb_status;
+ unsigned char scsi_status;
+
+ unsigned char port_number;
+ unsigned char path_id;
+ unsigned char target_id;
+ unsigned char lun;
+
+ unsigned char cdb_length;
+ unsigned char sense_info_length;
+ unsigned char data_in;
+ unsigned char reserved;
+
+ unsigned int data_transfer_length;
+
+ union {
+ unsigned char cdb[CDB16GENERIC_LENGTH];
+ unsigned char sense_data[SENSE_BUFFER_SIZE];
+ unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING];
+ };
+} __attribute((packed));
+
+
+/*
+ * This structure is sent during the intialization phase to get the different
+ * properties of the channel.
+ */
+struct vmstorage_channel_properties {
+ unsigned short protocol_version;
+ unsigned char path_id;
+ unsigned char target_id;
+
+ /* Note: port number is only really known on the client side */
+ unsigned int port_number;
+ unsigned int flags;
+ unsigned int max_transfer_bytes;
+
+ /* This id is unique for each channel and will correspond with */
+ /* vendor specific data in the inquirydata */
+ unsigned long long unique_id;
+} __packed;
+
+/* This structure is sent during the storage protocol negotiations. */
+struct vmstorage_protocol_version {
+ /* Major (MSW) and minor (LSW) version numbers. */
+ unsigned short major_minor;
+
+ /*
+ * Revision number is auto-incremented whenever this file is changed
+ * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
+ * definitely indicate incompatibility--but it does indicate mismatched
+ * builds.
+ */
+ unsigned short revision;
+} __packed;
+
+/* Channel Property Flags */
+#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
+#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
+
+struct vstor_packet {
+ /* Requested operation type */
+ enum vstor_packet_operation operation;
+
+ /* Flags - see below for values */
+ unsigned int flags;
+
+ /* Status of the request returned from the server side. */
+ unsigned int status;
+
+ /* Data payload area */
+ union {
+ /*
+ * Structure used to forward SCSI commands from the
+ * client to the server.
+ */
+ struct vmscsi_request vm_srb;
+
+ /* Structure used to query channel properties. */
+ struct vmstorage_channel_properties storage_channel_properties;
+
+ /* Used during version negotiations. */
+ struct vmstorage_protocol_version version;
+ };
+} __packed;
+
+/* Packet flags */
+/*
+ * This flag indicates that the server should send back a completion for this
+ * packet.
+ */
+#define REQUEST_COMPLETION_FLAG 0x1
+
+/* This is the set of flags that the vsc can set in any packets it sends */
+#define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG)
+
+
+/* Defines */
+
+#define STORVSC_MAX_IO_REQUESTS 128
+
+/*
+ * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
+ * reality, the path/target is not used (ie always set to 0) so our
+ * scsi host adapter essentially has 1 bus with 1 target that contains
+ * up to 256 luns.
+ */
+#define STORVSC_MAX_LUNS_PER_TARGET 64
+#define STORVSC_MAX_TARGETS 1
+#define STORVSC_MAX_CHANNELS 1
+#define STORVSC_MAX_CMD_LEN 16
+
+struct hv_storvsc_request;
+
+/* Matches Windows-end */
+enum storvsc_request_type {
+ WRITE_TYPE,
+ READ_TYPE,
+ UNKNOWN_TYPE,
+};
+
+
+struct hv_storvsc_request {
+ struct hv_device *device;
+
+ /* Synchronize the request/response if needed */
+ struct completion wait_event;
+
+ unsigned char *sense_buffer;
+ void *context;
+ void (*on_io_completion)(struct hv_storvsc_request *request);
+ struct hv_multipage_buffer data_buffer;
+
+ struct vstor_packet vstor_packet;
+};
+
+
+/* A storvsc device is a device object that contains a vmbus channel */
+struct storvsc_device {
+ struct hv_device *device;
+
+ bool destroy;
+ bool drain_notify;
+ atomic_t num_outstanding_req;
+ struct Scsi_Host *host;
+
+ wait_queue_head_t waiting_to_drain;
+
+ /*
+ * Each unique Port/Path/Target represents 1 channel ie scsi
+ * controller. In reality, the pathid, targetid is always 0
+ * and the port is set by us
+ */
+ unsigned int port_number;
+ unsigned char path_id;
+ unsigned char target_id;
+
+ /* Used for vsc/vsp channel reset process */
+ struct hv_storvsc_request init_request;
+ struct hv_storvsc_request reset_request;
+};
+
+struct hv_host_device {
+ struct hv_device *dev;
+ struct kmem_cache *request_pool;
+ unsigned int port;
+ unsigned char path;
+ unsigned char target;
+};
+
+struct storvsc_cmd_request {
+ struct list_head entry;
+ struct scsi_cmnd *cmd;
+
+ unsigned int bounce_sgl_count;
+ struct scatterlist *bounce_sgl;
+
+ struct hv_storvsc_request request;
+};
+
+static inline struct storvsc_device *get_out_stor_device(
+ struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = hv_get_drvdata(device);
+
+ if (stor_device && stor_device->destroy)
+ stor_device = NULL;
+
+ return stor_device;
+}
+
+
+static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
+{
+ dev->drain_notify = true;
+ wait_event(dev->waiting_to_drain,
+ atomic_read(&dev->num_outstanding_req) == 0);
+ dev->drain_notify = false;
+}
+
+static inline struct storvsc_device *get_in_stor_device(
+ struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+
+ stor_device = hv_get_drvdata(device);
+
+ if (!stor_device)
+ goto get_in_err;
+
+ /*
+ * If the device is being destroyed; allow incoming
+ * traffic only to cleanup outstanding requests.
+ */
+
+ if (stor_device->destroy &&
+ (atomic_read(&stor_device->num_outstanding_req) == 0))
+ stor_device = NULL;
+
+get_in_err:
+ return stor_device;
+
+}
+
+static int storvsc_channel_init(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ struct hv_storvsc_request *request;
+ struct vstor_packet *vstor_packet;
+ int ret, t;
+
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return -ENODEV;
+
+ request = &stor_device->init_request;
+ vstor_packet = &request->vstor_packet;
+
+ /*
+ * Now, initiate the vsc/vsp initialization protocol on the open
+ * channel
+ */
+ memset(request, 0, sizeof(struct hv_storvsc_request));
+ init_completion(&request->wait_event);
+ vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+
+ /* reuse the packet for version range supported */
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
+ vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT;
+ FILL_VMSTOR_REVISION(vstor_packet->version.revision);
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
+ vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+ vstor_packet->storage_channel_properties.port_number =
+ stor_device->port_number;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+ stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
+ stor_device->target_id
+ = vstor_packet->storage_channel_properties.target_id;
+
+ memset(vstor_packet, 0, sizeof(struct vstor_packet));
+ vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+ if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
+ vstor_packet->status != 0)
+ goto cleanup;
+
+
+cleanup:
+ return ret;
+}
+
+static void storvsc_on_io_completion(struct hv_device *device,
+ struct vstor_packet *vstor_packet,
+ struct hv_storvsc_request *request)
+{
+ struct storvsc_device *stor_device;
+ struct vstor_packet *stor_pkt;
+
+ stor_device = hv_get_drvdata(device);
+ stor_pkt = &request->vstor_packet;
+
+ /*
+ * The current SCSI handling on the host side does
+ * not correctly handle:
+ * INQUIRY command with page code parameter set to 0x80
+ * MODE_SENSE command with cmd[2] == 0x1c
+ *
+ * Setup srb and scsi status so this won't be fatal.
+ * We do this so we can distinguish truly fatal failues
+ * (srb status == 0x4) and off-line the device in that case.
+ */
+
+ if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
+ (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
+ vstor_packet->vm_srb.scsi_status = 0;
+ vstor_packet->vm_srb.srb_status = 0x1;
+ }
+
+
+ /* Copy over the status...etc */
+ stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
+ stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
+ stor_pkt->vm_srb.sense_info_length =
+ vstor_packet->vm_srb.sense_info_length;
+
+ if (vstor_packet->vm_srb.scsi_status != 0 ||
+ vstor_packet->vm_srb.srb_status != 1){
+ dev_warn(&device->device,
+ "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
+ stor_pkt->vm_srb.cdb[0],
+ vstor_packet->vm_srb.scsi_status,
+ vstor_packet->vm_srb.srb_status);
+ }
+
+ if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
+ /* CHECK_CONDITION */
+ if (vstor_packet->vm_srb.srb_status & 0x80) {
+ /* autosense data available */
+ dev_warn(&device->device,
+ "stor pkt %p autosense data valid - len %d\n",
+ request,
+ vstor_packet->vm_srb.sense_info_length);
+
+ memcpy(request->sense_buffer,
+ vstor_packet->vm_srb.sense_data,
+ vstor_packet->vm_srb.sense_info_length);
+
+ }
+ }
+
+ stor_pkt->vm_srb.data_transfer_length =
+ vstor_packet->vm_srb.data_transfer_length;
+
+ request->on_io_completion(request);
+
+ if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
+ stor_device->drain_notify)
+ wake_up(&stor_device->waiting_to_drain);
+
+
+}
+
+static void storvsc_on_receive(struct hv_device *device,
+ struct vstor_packet *vstor_packet,
+ struct hv_storvsc_request *request)
+{
+ switch (vstor_packet->operation) {
+ case VSTOR_OPERATION_COMPLETE_IO:
+ storvsc_on_io_completion(device, vstor_packet, request);
+ break;
+ case VSTOR_OPERATION_REMOVE_DEVICE:
+
+ default:
+ break;
+ }
+}
+
+static void storvsc_on_channel_callback(void *context)
+{
+ struct hv_device *device = (struct hv_device *)context;
+ struct storvsc_device *stor_device;
+ u32 bytes_recvd;
+ u64 request_id;
+ unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
+ struct hv_storvsc_request *request;
+ int ret;
+
+
+ stor_device = get_in_stor_device(device);
+ if (!stor_device)
+ return;
+
+ do {
+ ret = vmbus_recvpacket(device->channel, packet,
+ ALIGN(sizeof(struct vstor_packet), 8),
+ &bytes_recvd, &request_id);
+ if (ret == 0 && bytes_recvd > 0) {
+
+ request = (struct hv_storvsc_request *)
+ (unsigned long)request_id;
+
+ if ((request == &stor_device->init_request) ||
+ (request == &stor_device->reset_request)) {
+
+ memcpy(&request->vstor_packet, packet,
+ sizeof(struct vstor_packet));
+ complete(&request->wait_event);
+ } else {
+ storvsc_on_receive(device,
+ (struct vstor_packet *)packet,
+ request);
+ }
+ } else {
+ break;
+ }
+ } while (1);
+
+ return;
+}
+
+static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
+{
+ struct vmstorage_channel_properties props;
+ int ret;
+
+ memset(&props, 0, sizeof(struct vmstorage_channel_properties));
+
+ /* Open the channel */
+ ret = vmbus_open(device->channel,
+ ring_size,
+ ring_size,
+ (void *)&props,
+ sizeof(struct vmstorage_channel_properties),
+ storvsc_on_channel_callback, device);
+
+ if (ret != 0)
+ return ret;
+
+ ret = storvsc_channel_init(device);
+
+ return ret;
+}
+
+static int storvsc_dev_remove(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ unsigned long flags;
+
+ stor_device = hv_get_drvdata(device);
+
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
+ stor_device->destroy = true;
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+ /*
+ * At this point, all outbound traffic should be disable. We
+ * only allow inbound traffic (responses) to proceed so that
+ * outstanding requests can be completed.
+ */
+
+ storvsc_wait_to_drain(stor_device);
+
+ /*
+ * Since we have already drained, we don't need to busy wait
+ * as was done in final_release_stor_device()
+ * Note that we cannot set the ext pointer to NULL until
+ * we have drained - to drain the outgoing packets, we need to
+ * allow incoming packets.
+ */
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
+ hv_set_drvdata(device, NULL);
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+ /* Close the channel */
+ vmbus_close(device->channel);
+
+ kfree(stor_device);
+ return 0;
+}
+
+static int storvsc_do_io(struct hv_device *device,
+ struct hv_storvsc_request *request)
+{
+ struct storvsc_device *stor_device;
+ struct vstor_packet *vstor_packet;
+ int ret = 0;
+
+ vstor_packet = &request->vstor_packet;
+ stor_device = get_out_stor_device(device);
+
+ if (!stor_device)
+ return -ENODEV;
+
+
+ request->device = device;
+
+
+ vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
+
+ vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
+
+
+ vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE;
+
+
+ vstor_packet->vm_srb.data_transfer_length =
+ request->data_buffer.len;
+
+ vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
+
+ if (request->data_buffer.len) {
+ ret = vmbus_sendpacket_multipagebuffer(device->channel,
+ &request->data_buffer,
+ vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)request);
+ } else {
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ }
+
+ if (ret != 0)
+ return ret;
+
+ atomic_inc(&stor_device->num_outstanding_req);
+
+ return ret;
+}
+
+static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path)
+{
+ *target =
+ dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4];
+
+ *path =
+ dev->dev_instance.b[3] << 24 |
+ dev->dev_instance.b[2] << 16 |
+ dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0];
+}
+
+
+static int storvsc_device_alloc(struct scsi_device *sdevice)
+{
+ /*
+ * This enables luns to be located sparsely. Otherwise, we may not
+ * discovered them.
+ */
+ sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
+ return 0;
+}
+
+static int storvsc_merge_bvec(struct request_queue *q,
+ struct bvec_merge_data *bmd, struct bio_vec *bvec)
+{
+ /* checking done by caller. */
+ return bvec->bv_len;
+}
+
+static int storvsc_device_configure(struct scsi_device *sdevice)
+{
+ scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
+ STORVSC_MAX_IO_REQUESTS);
+
+ blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
+
+ blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
+
+ blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
+
+ return 0;
+}
+
+static void destroy_bounce_buffer(struct scatterlist *sgl,
+ unsigned int sg_count)
+{
+ int i;
+ struct page *page_buf;
+
+ for (i = 0; i < sg_count; i++) {
+ page_buf = sg_page((&sgl[i]));
+ if (page_buf != NULL)
+ __free_page(page_buf);
+ }
+
+ kfree(sgl);
+}
+
+static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
+{
+ int i;
+
+ /* No need to check */
+ if (sg_count < 2)
+ return -1;
+
+ /* We have at least 2 sg entries */
+ for (i = 0; i < sg_count; i++) {
+ if (i == 0) {
+ /* make sure 1st one does not have hole */
+ if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
+ return i;
+ } else if (i == sg_count - 1) {
+ /* make sure last one does not have hole */
+ if (sgl[i].offset != 0)
+ return i;
+ } else {
+ /* make sure no hole in the middle */
+ if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
+ return i;
+ }
+ }
+ return -1;
+}
+
+static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
+ unsigned int sg_count,
+ unsigned int len)
+{
+ int i;
+ int num_pages;
+ struct scatterlist *bounce_sgl;
+ struct page *page_buf;
+
+ num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
+
+ bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
+ if (!bounce_sgl)
+ return NULL;
+
+ for (i = 0; i < num_pages; i++) {
+ page_buf = alloc_page(GFP_ATOMIC);
+ if (!page_buf)
+ goto cleanup;
+ sg_set_page(&bounce_sgl[i], page_buf, 0, 0);
+ }
+
+ return bounce_sgl;
+
+cleanup:
+ destroy_bounce_buffer(bounce_sgl, num_pages);
+ return NULL;
+}
+
+
+/* Assume the original sgl has enough room */
+static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
+ struct scatterlist *bounce_sgl,
+ unsigned int orig_sgl_count)
+{
+ int i;
+ int j = 0;
+ unsigned long src, dest;
+ unsigned int srclen, destlen, copylen;
+ unsigned int total_copied = 0;
+ unsigned long bounce_addr = 0;
+ unsigned long dest_addr = 0;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ for (i = 0; i < orig_sgl_count; i++) {
+ dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
+ KM_IRQ0) + orig_sgl[i].offset;
+ dest = dest_addr;
+ destlen = orig_sgl[i].length;
+
+ if (bounce_addr == 0)
+ bounce_addr =
+ (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
+ KM_IRQ0);
+
+ while (destlen) {
+ src = bounce_addr + bounce_sgl[j].offset;
+ srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
+
+ copylen = min(srclen, destlen);
+ memcpy((void *)dest, (void *)src, copylen);
+
+ total_copied += copylen;
+ bounce_sgl[j].offset += copylen;
+ destlen -= copylen;
+ dest += copylen;
+
+ if (bounce_sgl[j].offset == bounce_sgl[j].length) {
+ /* full */
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+ j++;
+
+ /* if we need to use another bounce buffer */
+ if (destlen || i != orig_sgl_count - 1)
+ bounce_addr =
+ (unsigned long)kmap_atomic(
+ sg_page((&bounce_sgl[j])), KM_IRQ0);
+ } else if (destlen == 0 && i == orig_sgl_count - 1) {
+ /* unmap the last bounce that is < PAGE_SIZE */
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+ }
+ }
+
+ kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
+ KM_IRQ0);
+ }
+
+ local_irq_restore(flags);
+
+ return total_copied;
+}
+
+
+/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
+static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
+ struct scatterlist *bounce_sgl,
+ unsigned int orig_sgl_count)
+{
+ int i;
+ int j = 0;
+ unsigned long src, dest;
+ unsigned int srclen, destlen, copylen;
+ unsigned int total_copied = 0;
+ unsigned long bounce_addr = 0;
+ unsigned long src_addr = 0;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ for (i = 0; i < orig_sgl_count; i++) {
+ src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
+ KM_IRQ0) + orig_sgl[i].offset;
+ src = src_addr;
+ srclen = orig_sgl[i].length;
+
+ if (bounce_addr == 0)
+ bounce_addr =
+ (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
+ KM_IRQ0);
+
+ while (srclen) {
+ /* assume bounce offset always == 0 */
+ dest = bounce_addr + bounce_sgl[j].length;
+ destlen = PAGE_SIZE - bounce_sgl[j].length;
+
+ copylen = min(srclen, destlen);
+ memcpy((void *)dest, (void *)src, copylen);
+
+ total_copied += copylen;
+ bounce_sgl[j].length += copylen;
+ srclen -= copylen;
+ src += copylen;
+
+ if (bounce_sgl[j].length == PAGE_SIZE) {
+ /* full..move to next entry */
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+ j++;
+
+ /* if we need to use another bounce buffer */
+ if (srclen || i != orig_sgl_count - 1)
+ bounce_addr =
+ (unsigned long)kmap_atomic(
+ sg_page((&bounce_sgl[j])), KM_IRQ0);
+
+ } else if (srclen == 0 && i == orig_sgl_count - 1) {
+ /* unmap the last bounce that is < PAGE_SIZE */
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+ }
+ }
+
+ kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
+ }
+
+ local_irq_restore(flags);
+
+ return total_copied;
+}
+
+
+static int storvsc_remove(struct hv_device *dev)
+{
+ struct storvsc_device *stor_device = hv_get_drvdata(dev);
+ struct Scsi_Host *host = stor_device->host;
+ struct hv_host_device *host_dev =
+ (struct hv_host_device *)host->hostdata;
+
+ scsi_remove_host(host);
+
+ scsi_host_put(host);
+
+ storvsc_dev_remove(dev);
+ if (host_dev->request_pool) {
+ kmem_cache_destroy(host_dev->request_pool);
+ host_dev->request_pool = NULL;
+ }
+ return 0;
+}
+
+
+static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
+ sector_t capacity, int *info)
+{
+ sector_t nsect = capacity;
+ sector_t cylinders = nsect;
+ int heads, sectors_pt;
+
+ /*
+ * We are making up these values; let us keep it simple.
+ */
+ heads = 0xff;
+ sectors_pt = 0x3f; /* Sectors per track */
+ sector_div(cylinders, heads * sectors_pt);
+ if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
+ cylinders = 0xffff;
+
+ info[0] = heads;
+ info[1] = sectors_pt;
+ info[2] = (int)cylinders;
+
+ return 0;
+}
+
+static int storvsc_host_reset(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ struct hv_storvsc_request *request;
+ struct vstor_packet *vstor_packet;
+ int ret, t;
+
+
+ stor_device = get_out_stor_device(device);
+ if (!stor_device)
+ return -ENODEV;
+
+ request = &stor_device->reset_request;
+ vstor_packet = &request->vstor_packet;
+
+ init_completion(&request->wait_event);
+
+ vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
+ vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+ vstor_packet->vm_srb.path_id = stor_device->path_id;
+
+ ret = vmbus_sendpacket(device->channel, vstor_packet,
+ sizeof(struct vstor_packet),
+ (unsigned long)&stor_device->reset_request,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ if (ret != 0)
+ goto cleanup;
+
+ t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
+ if (t == 0) {
+ ret = -ETIMEDOUT;
+ goto cleanup;
+ }
+
+
+ /*
+ * At this point, all outstanding requests in the adapter
+ * should have been flushed out and return to us
+ */
+
+cleanup:
+ return ret;
+}
+
+
+/*
+ * storvsc_host_reset_handler - Reset the scsi HBA
+ */
+static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
+{
+ int ret;
+ struct hv_host_device *host_dev =
+ (struct hv_host_device *)scmnd->device->host->hostdata;
+ struct hv_device *dev = host_dev->dev;
+
+ ret = storvsc_host_reset(dev);
+ if (ret != 0)
+ return ret;
+
+ return ret;
+}
+
+
+/*
+ * storvsc_command_completion - Command completion processing
+ */
+static void storvsc_command_completion(struct hv_storvsc_request *request)
+{
+ struct storvsc_cmd_request *cmd_request =
+ (struct storvsc_cmd_request *)request->context;
+ struct scsi_cmnd *scmnd = cmd_request->cmd;
+ struct hv_host_device *host_dev =
+ (struct hv_host_device *)scmnd->device->host->hostdata;
+ void (*scsi_done_fn)(struct scsi_cmnd *);
+ struct scsi_sense_hdr sense_hdr;
+ struct vmscsi_request *vm_srb;
+
+ vm_srb = &request->vstor_packet.vm_srb;
+ if (cmd_request->bounce_sgl_count) {
+ if (vm_srb->data_in == READ_TYPE) {
+ copy_from_bounce_buffer(scsi_sglist(scmnd),
+ cmd_request->bounce_sgl,
+ scsi_sg_count(scmnd));
+ destroy_bounce_buffer(cmd_request->bounce_sgl,
+ cmd_request->bounce_sgl_count);
+ }
+ }
+
+ /*
+ * If there is an error; offline the device since all
+ * error recovery strategies would have already been
+ * deployed on the host side.
+ */
+ if (vm_srb->srb_status == 0x4)
+ scmnd->result = DID_TARGET_FAILURE << 16;
+ else
+ scmnd->result = vm_srb->scsi_status;
+
+ if (scmnd->result) {
+ if (scsi_normalize_sense(scmnd->sense_buffer,
+ SCSI_SENSE_BUFFERSIZE, &sense_hdr))
+ scsi_print_sense_hdr("storvsc", &sense_hdr);
+ }
+
+ scsi_set_resid(scmnd,
+ request->data_buffer.len -
+ vm_srb->data_transfer_length);
+
+ scsi_done_fn = scmnd->scsi_done;
+
+ scmnd->host_scribble = NULL;
+ scmnd->scsi_done = NULL;
+
+ scsi_done_fn(scmnd);
+
+ kmem_cache_free(host_dev->request_pool, cmd_request);
+}
+
+static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
+{
+ bool allowed = true;
+ u8 scsi_op = scmnd->cmnd[0];
+
+ switch (scsi_op) {
+ /* smartd sends this command, which will offline the device */
+ case SET_WINDOW:
+ scmnd->result = DID_ERROR << 16;
+ allowed = false;
+ break;
+ default:
+ break;
+ }
+ return allowed;
+}
+
+/*
+ * storvsc_queuecommand - Initiate command processing
+ */
+static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
+ void (*done)(struct scsi_cmnd *))
+{
+ int ret;
+ struct hv_host_device *host_dev =
+ (struct hv_host_device *)scmnd->device->host->hostdata;
+ struct hv_device *dev = host_dev->dev;
+ struct hv_storvsc_request *request;
+ struct storvsc_cmd_request *cmd_request;
+ unsigned int request_size = 0;
+ int i;
+ struct scatterlist *sgl;
+ unsigned int sg_count = 0;
+ struct vmscsi_request *vm_srb;
+
+ if (storvsc_check_scsi_cmd(scmnd) == false) {
+ done(scmnd);
+ return 0;
+ }
+
+ /* If retrying, no need to prep the cmd */
+ if (scmnd->host_scribble) {
+
+ cmd_request =
+ (struct storvsc_cmd_request *)scmnd->host_scribble;
+
+ goto retry_request;
+ }
+
+ scmnd->scsi_done = done;
+
+ request_size = sizeof(struct storvsc_cmd_request);
+
+ cmd_request = kmem_cache_zalloc(host_dev->request_pool,
+ GFP_ATOMIC);
+ if (!cmd_request) {
+ scmnd->scsi_done = NULL;
+ return SCSI_MLQUEUE_DEVICE_BUSY;
+ }
+
+ /* Setup the cmd request */
+ cmd_request->bounce_sgl_count = 0;
+ cmd_request->bounce_sgl = NULL;
+ cmd_request->cmd = scmnd;
+
+ scmnd->host_scribble = (unsigned char *)cmd_request;
+
+ request = &cmd_request->request;
+ vm_srb = &request->vstor_packet.vm_srb;
+
+
+ /* Build the SRB */
+ switch (scmnd->sc_data_direction) {
+ case DMA_TO_DEVICE:
+ vm_srb->data_in = WRITE_TYPE;
+ break;
+ case DMA_FROM_DEVICE:
+ vm_srb->data_in = READ_TYPE;
+ break;
+ default:
+ vm_srb->data_in = UNKNOWN_TYPE;
+ break;
+ }
+
+ request->on_io_completion = storvsc_command_completion;
+ request->context = cmd_request;/* scmnd; */
+
+ vm_srb->port_number = host_dev->port;
+ vm_srb->path_id = scmnd->device->channel;
+ vm_srb->target_id = scmnd->device->id;
+ vm_srb->lun = scmnd->device->lun;
+
+ vm_srb->cdb_length = scmnd->cmd_len;
+
+ memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
+
+ request->sense_buffer = scmnd->sense_buffer;
+
+
+ request->data_buffer.len = scsi_bufflen(scmnd);
+ if (scsi_sg_count(scmnd)) {
+ sgl = (struct scatterlist *)scsi_sglist(scmnd);
+ sg_count = scsi_sg_count(scmnd);
+
+ /* check if we need to bounce the sgl */
+ if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
+ cmd_request->bounce_sgl =
+ create_bounce_buffer(sgl, scsi_sg_count(scmnd),
+ scsi_bufflen(scmnd));
+ if (!cmd_request->bounce_sgl) {
+ scmnd->scsi_done = NULL;
+ scmnd->host_scribble = NULL;
+ kmem_cache_free(host_dev->request_pool,
+ cmd_request);
+
+ return SCSI_MLQUEUE_HOST_BUSY;
+ }
+
+ cmd_request->bounce_sgl_count =
+ ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
+ PAGE_SHIFT;
+
+ if (vm_srb->data_in == WRITE_TYPE)
+ copy_to_bounce_buffer(sgl,
+ cmd_request->bounce_sgl,
+ scsi_sg_count(scmnd));
+
+ sgl = cmd_request->bounce_sgl;
+ sg_count = cmd_request->bounce_sgl_count;
+ }
+
+ request->data_buffer.offset = sgl[0].offset;
+
+ for (i = 0; i < sg_count; i++)
+ request->data_buffer.pfn_array[i] =
+ page_to_pfn(sg_page((&sgl[i])));
+
+ } else if (scsi_sglist(scmnd)) {
+ request->data_buffer.offset =
+ virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
+ request->data_buffer.pfn_array[0] =
+ virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
+ }
+
+retry_request:
+ /* Invokes the vsc to start an IO */
+ ret = storvsc_do_io(dev, &cmd_request->request);
+
+ if (ret == -EAGAIN) {
+ /* no more space */
+
+ if (cmd_request->bounce_sgl_count)
+ destroy_bounce_buffer(cmd_request->bounce_sgl,
+ cmd_request->bounce_sgl_count);
+
+ kmem_cache_free(host_dev->request_pool, cmd_request);
+
+ scmnd->scsi_done = NULL;
+ scmnd->host_scribble = NULL;
+
+ ret = SCSI_MLQUEUE_DEVICE_BUSY;
+ }
+
+ return ret;
+}
+
+static DEF_SCSI_QCMD(storvsc_queuecommand)
+
+
+/* Scsi driver */
+static struct scsi_host_template scsi_driver = {
+ .module = THIS_MODULE,
+ .name = "storvsc_host_t",
+ .bios_param = storvsc_get_chs,
+ .queuecommand = storvsc_queuecommand,
+ .eh_host_reset_handler = storvsc_host_reset_handler,
+ .slave_alloc = storvsc_device_alloc,
+ .slave_configure = storvsc_device_configure,
+ .cmd_per_lun = 1,
+ /* 64 max_queue * 1 target */
+ .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
+ .this_id = -1,
+ /* no use setting to 0 since ll_blk_rw reset it to 1 */
+ /* currently 32 */
+ .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
+ /*
+ * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
+ * into 1 sg element. If set, we must limit the max_segment_size to
+ * PAGE_SIZE, otherwise we may get 1 sg element that represents
+ * multiple
+ */
+ /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
+ .use_clustering = ENABLE_CLUSTERING,
+ /* Make sure we dont get a sg segment crosses a page boundary */
+ .dma_boundary = PAGE_SIZE-1,
+};
+
+enum {
+ SCSI_GUID,
+ IDE_GUID,
+};
+
+static const struct hv_vmbus_device_id id_table[] = {
+ /* SCSI guid */
+ { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
+ 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
+ .driver_data = SCSI_GUID },
+ /* IDE guid */
+ { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
+ 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
+ .driver_data = IDE_GUID },
+ { },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+
+/*
+ * storvsc_probe - Add a new device for this driver
+ */
+
+static int storvsc_probe(struct hv_device *device,
+ const struct hv_vmbus_device_id *dev_id)
+{
+ int ret;
+ struct Scsi_Host *host;
+ struct hv_host_device *host_dev;
+ bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
+ int path = 0;
+ int target = 0;
+ struct storvsc_device *stor_device;
+
+ host = scsi_host_alloc(&scsi_driver,
+ sizeof(struct hv_host_device));
+ if (!host)
+ return -ENOMEM;
+
+ host_dev = (struct hv_host_device *)host->hostdata;
+ memset(host_dev, 0, sizeof(struct hv_host_device));
+
+ host_dev->port = host->host_no;
+ host_dev->dev = device;
+
+ host_dev->request_pool =
+ kmem_cache_create(dev_name(&device->device),
+ sizeof(struct storvsc_cmd_request), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+
+ if (!host_dev->request_pool) {
+ scsi_host_put(host);
+ return -ENOMEM;
+ }
+
+ stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
+ if (!stor_device) {
+ kmem_cache_destroy(host_dev->request_pool);
+ scsi_host_put(host);
+ return -ENOMEM;
+ }
+
+ stor_device->destroy = false;
+ init_waitqueue_head(&stor_device->waiting_to_drain);
+ stor_device->device = device;
+ stor_device->host = host;
+ hv_set_drvdata(device, stor_device);
+
+ stor_device->port_number = host->host_no;
+ ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
+ if (ret) {
+ kmem_cache_destroy(host_dev->request_pool);
+ scsi_host_put(host);
+ kfree(stor_device);
+ return ret;
+ }
+
+ if (dev_is_ide)
+ storvsc_get_ide_info(device, &target, &path);
+
+ host_dev->path = stor_device->path_id;
+ host_dev->target = stor_device->target_id;
+
+ /* max # of devices per target */
+ host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
+ /* max # of targets per channel */
+ host->max_id = STORVSC_MAX_TARGETS;
+ /* max # of channels */
+ host->max_channel = STORVSC_MAX_CHANNELS - 1;
+ /* max cmd length */
+ host->max_cmd_len = STORVSC_MAX_CMD_LEN;
+
+ /* Register the HBA and start the scsi bus scan */
+ ret = scsi_add_host(host, &device->device);
+ if (ret != 0)
+ goto err_out;
+
+ if (!dev_is_ide) {
+ scsi_scan_host(host);
+ return 0;
+ }
+ ret = scsi_add_device(host, 0, target, 0);
+ if (ret) {
+ scsi_remove_host(host);
+ goto err_out;
+ }
+ return 0;
+
+err_out:
+ storvsc_dev_remove(device);
+ kmem_cache_destroy(host_dev->request_pool);
+ scsi_host_put(host);
+ return -ENODEV;
+}
+
+/* The one and only one */
+
+static struct hv_driver storvsc_drv = {
+ .name = "storvsc",
+ .id_table = id_table,
+ .probe = storvsc_probe,
+ .remove = storvsc_remove,
+};
+
+static int __init storvsc_drv_init(void)
+{
+ u32 max_outstanding_req_per_channel;
+
+ /*
+ * Divide the ring buffer data size (which is 1 page less
+ * than the ring buffer size since that page is reserved for
+ * the ring buffer indices) by the max request size (which is
+ * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
+ */
+ max_outstanding_req_per_channel =
+ ((storvsc_ringbuffer_size - PAGE_SIZE) /
+ ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
+ sizeof(struct vstor_packet) + sizeof(u64),
+ sizeof(u64)));
+
+ if (max_outstanding_req_per_channel <
+ STORVSC_MAX_IO_REQUESTS)
+ return -EINVAL;
+
+ return vmbus_driver_register(&storvsc_drv);
+}
+
+static void __exit storvsc_drv_exit(void)
+{
+ vmbus_driver_unregister(&storvsc_drv);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HV_DRV_VERSION);
+MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
+module_init(storvsc_drv_init);
+module_exit(storvsc_drv_exit);
diff --git a/drivers/staging/hv/Kconfig b/drivers/staging/hv/Kconfig
index 6c0dc30..3c98a2a 100644
--- a/drivers/staging/hv/Kconfig
+++ b/drivers/staging/hv/Kconfig
@@ -1,9 +1,3 @@
-config HYPERV_STORAGE
- tristate "Microsoft Hyper-V virtual storage driver"
- depends on HYPERV && SCSI
- help
- Select this option to enable the Hyper-V virtual storage driver.
-
config HYPERV_NET
tristate "Microsoft Hyper-V virtual network driver"
depends on HYPERV && NET
diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index 3a2751e..91e4a11 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -1,6 +1,4 @@
obj-$(CONFIG_HYPERV) += hv_timesource.o
-obj-$(CONFIG_HYPERV_STORAGE) += hv_storvsc.o
obj-$(CONFIG_HYPERV_NET) += hv_netvsc.o
-hv_storvsc-y := storvsc_drv.o
hv_netvsc-y := netvsc_drv.o netvsc.o rndis_filter.o
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
deleted file mode 100644
index ae8c33e..0000000
--- a/drivers/staging/hv/storvsc_drv.c
+++ /dev/null
@@ -1,1480 +0,0 @@
-/*
- * Copyright (c) 2009, Microsoft Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
- * Authors:
- * Haiyang Zhang <haiyangz@...rosoft.com>
- * Hank Janssen <hjanssen@...rosoft.com>
- * K. Y. Srinivasan <kys@...rosoft.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/hyperv.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_tcq.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_devinfo.h>
-#include <scsi/scsi_dbg.h>
-
-
-#define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
-static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
-
-module_param(storvsc_ringbuffer_size, int, S_IRUGO);
-MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
-
-/* to alert the user that structure sizes may be mismatched even though the */
-/* protocol versions match. */
-
-
-#define REVISION_STRING(REVISION_) #REVISION_
-#define FILL_VMSTOR_REVISION(RESULT_LVALUE_) \
- do { \
- char *revision_string \
- = REVISION_STRING($Rev : 6 $) + 6; \
- RESULT_LVALUE_ = 0; \
- while (*revision_string >= '0' \
- && *revision_string <= '9') { \
- RESULT_LVALUE_ *= 10; \
- RESULT_LVALUE_ += *revision_string - '0'; \
- revision_string++; \
- } \
- } while (0)
-
-/* Major/minor macros. Minor version is in LSB, meaning that earlier flat */
-/* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */
-#define VMSTOR_PROTOCOL_MAJOR(VERSION_) (((VERSION_) >> 8) & 0xff)
-#define VMSTOR_PROTOCOL_MINOR(VERSION_) (((VERSION_)) & 0xff)
-#define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
- (((MINOR_) & 0xff)))
-#define VMSTOR_INVALID_PROTOCOL_VERSION (-1)
-
-/* Version history: */
-/* V1 Beta 0.1 */
-/* V1 RC < 2008/1/31 1.0 */
-/* V1 RC > 2008/1/31 2.0 */
-#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
-
-
-
-
-/* This will get replaced with the max transfer length that is possible on */
-/* the host adapter. */
-/* The max transfer length will be published when we offer a vmbus channel. */
-#define MAX_TRANSFER_LENGTH 0x40000
-#define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \
- sizeof(struct vstor_packet) + \
- sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
-
-
-/* Packet structure describing virtual storage requests. */
-enum vstor_packet_operation {
- VSTOR_OPERATION_COMPLETE_IO = 1,
- VSTOR_OPERATION_REMOVE_DEVICE = 2,
- VSTOR_OPERATION_EXECUTE_SRB = 3,
- VSTOR_OPERATION_RESET_LUN = 4,
- VSTOR_OPERATION_RESET_ADAPTER = 5,
- VSTOR_OPERATION_RESET_BUS = 6,
- VSTOR_OPERATION_BEGIN_INITIALIZATION = 7,
- VSTOR_OPERATION_END_INITIALIZATION = 8,
- VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
- VSTOR_OPERATION_QUERY_PROPERTIES = 10,
- VSTOR_OPERATION_MAXIMUM = 10
-};
-
-/*
- * Platform neutral description of a scsi request -
- * this remains the same across the write regardless of 32/64 bit
- * note: it's patterned off the SCSI_PASS_THROUGH structure
- */
-#define CDB16GENERIC_LENGTH 0x10
-
-#ifndef SENSE_BUFFER_SIZE
-#define SENSE_BUFFER_SIZE 0x12
-#endif
-
-#define MAX_DATA_BUF_LEN_WITH_PADDING 0x14
-
-struct vmscsi_request {
- unsigned short length;
- unsigned char srb_status;
- unsigned char scsi_status;
-
- unsigned char port_number;
- unsigned char path_id;
- unsigned char target_id;
- unsigned char lun;
-
- unsigned char cdb_length;
- unsigned char sense_info_length;
- unsigned char data_in;
- unsigned char reserved;
-
- unsigned int data_transfer_length;
-
- union {
- unsigned char cdb[CDB16GENERIC_LENGTH];
- unsigned char sense_data[SENSE_BUFFER_SIZE];
- unsigned char reserved_array[MAX_DATA_BUF_LEN_WITH_PADDING];
- };
-} __attribute((packed));
-
-
-/*
- * This structure is sent during the intialization phase to get the different
- * properties of the channel.
- */
-struct vmstorage_channel_properties {
- unsigned short protocol_version;
- unsigned char path_id;
- unsigned char target_id;
-
- /* Note: port number is only really known on the client side */
- unsigned int port_number;
- unsigned int flags;
- unsigned int max_transfer_bytes;
-
- /* This id is unique for each channel and will correspond with */
- /* vendor specific data in the inquirydata */
- unsigned long long unique_id;
-} __packed;
-
-/* This structure is sent during the storage protocol negotiations. */
-struct vmstorage_protocol_version {
- /* Major (MSW) and minor (LSW) version numbers. */
- unsigned short major_minor;
-
- /*
- * Revision number is auto-incremented whenever this file is changed
- * (See FILL_VMSTOR_REVISION macro above). Mismatch does not
- * definitely indicate incompatibility--but it does indicate mismatched
- * builds.
- */
- unsigned short revision;
-} __packed;
-
-/* Channel Property Flags */
-#define STORAGE_CHANNEL_REMOVABLE_FLAG 0x1
-#define STORAGE_CHANNEL_EMULATED_IDE_FLAG 0x2
-
-struct vstor_packet {
- /* Requested operation type */
- enum vstor_packet_operation operation;
-
- /* Flags - see below for values */
- unsigned int flags;
-
- /* Status of the request returned from the server side. */
- unsigned int status;
-
- /* Data payload area */
- union {
- /*
- * Structure used to forward SCSI commands from the
- * client to the server.
- */
- struct vmscsi_request vm_srb;
-
- /* Structure used to query channel properties. */
- struct vmstorage_channel_properties storage_channel_properties;
-
- /* Used during version negotiations. */
- struct vmstorage_protocol_version version;
- };
-} __packed;
-
-/* Packet flags */
-/*
- * This flag indicates that the server should send back a completion for this
- * packet.
- */
-#define REQUEST_COMPLETION_FLAG 0x1
-
-/* This is the set of flags that the vsc can set in any packets it sends */
-#define VSC_LEGAL_FLAGS (REQUEST_COMPLETION_FLAG)
-
-
-/* Defines */
-
-#define STORVSC_MAX_IO_REQUESTS 128
-
-/*
- * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
- * reality, the path/target is not used (ie always set to 0) so our
- * scsi host adapter essentially has 1 bus with 1 target that contains
- * up to 256 luns.
- */
-#define STORVSC_MAX_LUNS_PER_TARGET 64
-#define STORVSC_MAX_TARGETS 1
-#define STORVSC_MAX_CHANNELS 1
-#define STORVSC_MAX_CMD_LEN 16
-
-struct hv_storvsc_request;
-
-/* Matches Windows-end */
-enum storvsc_request_type {
- WRITE_TYPE,
- READ_TYPE,
- UNKNOWN_TYPE,
-};
-
-
-struct hv_storvsc_request {
- struct hv_device *device;
-
- /* Synchronize the request/response if needed */
- struct completion wait_event;
-
- unsigned char *sense_buffer;
- void *context;
- void (*on_io_completion)(struct hv_storvsc_request *request);
- struct hv_multipage_buffer data_buffer;
-
- struct vstor_packet vstor_packet;
-};
-
-
-/* A storvsc device is a device object that contains a vmbus channel */
-struct storvsc_device {
- struct hv_device *device;
-
- bool destroy;
- bool drain_notify;
- atomic_t num_outstanding_req;
- struct Scsi_Host *host;
-
- wait_queue_head_t waiting_to_drain;
-
- /*
- * Each unique Port/Path/Target represents 1 channel ie scsi
- * controller. In reality, the pathid, targetid is always 0
- * and the port is set by us
- */
- unsigned int port_number;
- unsigned char path_id;
- unsigned char target_id;
-
- /* Used for vsc/vsp channel reset process */
- struct hv_storvsc_request init_request;
- struct hv_storvsc_request reset_request;
-};
-
-struct hv_host_device {
- struct hv_device *dev;
- struct kmem_cache *request_pool;
- unsigned int port;
- unsigned char path;
- unsigned char target;
-};
-
-struct storvsc_cmd_request {
- struct list_head entry;
- struct scsi_cmnd *cmd;
-
- unsigned int bounce_sgl_count;
- struct scatterlist *bounce_sgl;
-
- struct hv_storvsc_request request;
-};
-
-static inline struct storvsc_device *get_out_stor_device(
- struct hv_device *device)
-{
- struct storvsc_device *stor_device;
-
- stor_device = hv_get_drvdata(device);
-
- if (stor_device && stor_device->destroy)
- stor_device = NULL;
-
- return stor_device;
-}
-
-
-static inline void storvsc_wait_to_drain(struct storvsc_device *dev)
-{
- dev->drain_notify = true;
- wait_event(dev->waiting_to_drain,
- atomic_read(&dev->num_outstanding_req) == 0);
- dev->drain_notify = false;
-}
-
-static inline struct storvsc_device *get_in_stor_device(
- struct hv_device *device)
-{
- struct storvsc_device *stor_device;
-
- stor_device = hv_get_drvdata(device);
-
- if (!stor_device)
- goto get_in_err;
-
- /*
- * If the device is being destroyed; allow incoming
- * traffic only to cleanup outstanding requests.
- */
-
- if (stor_device->destroy &&
- (atomic_read(&stor_device->num_outstanding_req) == 0))
- stor_device = NULL;
-
-get_in_err:
- return stor_device;
-
-}
-
-static int storvsc_channel_init(struct hv_device *device)
-{
- struct storvsc_device *stor_device;
- struct hv_storvsc_request *request;
- struct vstor_packet *vstor_packet;
- int ret, t;
-
- stor_device = get_out_stor_device(device);
- if (!stor_device)
- return -ENODEV;
-
- request = &stor_device->init_request;
- vstor_packet = &request->vstor_packet;
-
- /*
- * Now, initiate the vsc/vsp initialization protocol on the open
- * channel
- */
- memset(request, 0, sizeof(struct hv_storvsc_request));
- init_completion(&request->wait_event);
- vstor_packet->operation = VSTOR_OPERATION_BEGIN_INITIALIZATION;
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
-
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (ret != 0)
- goto cleanup;
-
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
- }
-
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
- vstor_packet->status != 0)
- goto cleanup;
-
-
- /* reuse the packet for version range supported */
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
- vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
-
- vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT;
- FILL_VMSTOR_REVISION(vstor_packet->version.revision);
-
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (ret != 0)
- goto cleanup;
-
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
- }
-
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
- vstor_packet->status != 0)
- goto cleanup;
-
-
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
- vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
- vstor_packet->storage_channel_properties.port_number =
- stor_device->port_number;
-
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-
- if (ret != 0)
- goto cleanup;
-
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
- }
-
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
- vstor_packet->status != 0)
- goto cleanup;
-
- stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
- stor_device->target_id
- = vstor_packet->storage_channel_properties.target_id;
-
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
- vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
-
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-
- if (ret != 0)
- goto cleanup;
-
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
- }
-
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
- vstor_packet->status != 0)
- goto cleanup;
-
-
-cleanup:
- return ret;
-}
-
-static void storvsc_on_io_completion(struct hv_device *device,
- struct vstor_packet *vstor_packet,
- struct hv_storvsc_request *request)
-{
- struct storvsc_device *stor_device;
- struct vstor_packet *stor_pkt;
-
- stor_device = hv_get_drvdata(device);
- stor_pkt = &request->vstor_packet;
-
- /*
- * The current SCSI handling on the host side does
- * not correctly handle:
- * INQUIRY command with page code parameter set to 0x80
- * MODE_SENSE command with cmd[2] == 0x1c
- *
- * Setup srb and scsi status so this won't be fatal.
- * We do this so we can distinguish truly fatal failues
- * (srb status == 0x4) and off-line the device in that case.
- */
-
- if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
- (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
- vstor_packet->vm_srb.scsi_status = 0;
- vstor_packet->vm_srb.srb_status = 0x1;
- }
-
-
- /* Copy over the status...etc */
- stor_pkt->vm_srb.scsi_status = vstor_packet->vm_srb.scsi_status;
- stor_pkt->vm_srb.srb_status = vstor_packet->vm_srb.srb_status;
- stor_pkt->vm_srb.sense_info_length =
- vstor_packet->vm_srb.sense_info_length;
-
- if (vstor_packet->vm_srb.scsi_status != 0 ||
- vstor_packet->vm_srb.srb_status != 1){
- dev_warn(&device->device,
- "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
- stor_pkt->vm_srb.cdb[0],
- vstor_packet->vm_srb.scsi_status,
- vstor_packet->vm_srb.srb_status);
- }
-
- if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
- /* CHECK_CONDITION */
- if (vstor_packet->vm_srb.srb_status & 0x80) {
- /* autosense data available */
- dev_warn(&device->device,
- "stor pkt %p autosense data valid - len %d\n",
- request,
- vstor_packet->vm_srb.sense_info_length);
-
- memcpy(request->sense_buffer,
- vstor_packet->vm_srb.sense_data,
- vstor_packet->vm_srb.sense_info_length);
-
- }
- }
-
- stor_pkt->vm_srb.data_transfer_length =
- vstor_packet->vm_srb.data_transfer_length;
-
- request->on_io_completion(request);
-
- if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
- stor_device->drain_notify)
- wake_up(&stor_device->waiting_to_drain);
-
-
-}
-
-static void storvsc_on_receive(struct hv_device *device,
- struct vstor_packet *vstor_packet,
- struct hv_storvsc_request *request)
-{
- switch (vstor_packet->operation) {
- case VSTOR_OPERATION_COMPLETE_IO:
- storvsc_on_io_completion(device, vstor_packet, request);
- break;
- case VSTOR_OPERATION_REMOVE_DEVICE:
-
- default:
- break;
- }
-}
-
-static void storvsc_on_channel_callback(void *context)
-{
- struct hv_device *device = (struct hv_device *)context;
- struct storvsc_device *stor_device;
- u32 bytes_recvd;
- u64 request_id;
- unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
- struct hv_storvsc_request *request;
- int ret;
-
-
- stor_device = get_in_stor_device(device);
- if (!stor_device)
- return;
-
- do {
- ret = vmbus_recvpacket(device->channel, packet,
- ALIGN(sizeof(struct vstor_packet), 8),
- &bytes_recvd, &request_id);
- if (ret == 0 && bytes_recvd > 0) {
-
- request = (struct hv_storvsc_request *)
- (unsigned long)request_id;
-
- if ((request == &stor_device->init_request) ||
- (request == &stor_device->reset_request)) {
-
- memcpy(&request->vstor_packet, packet,
- sizeof(struct vstor_packet));
- complete(&request->wait_event);
- } else {
- storvsc_on_receive(device,
- (struct vstor_packet *)packet,
- request);
- }
- } else {
- break;
- }
- } while (1);
-
- return;
-}
-
-static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
-{
- struct vmstorage_channel_properties props;
- int ret;
-
- memset(&props, 0, sizeof(struct vmstorage_channel_properties));
-
- /* Open the channel */
- ret = vmbus_open(device->channel,
- ring_size,
- ring_size,
- (void *)&props,
- sizeof(struct vmstorage_channel_properties),
- storvsc_on_channel_callback, device);
-
- if (ret != 0)
- return ret;
-
- ret = storvsc_channel_init(device);
-
- return ret;
-}
-
-static int storvsc_dev_remove(struct hv_device *device)
-{
- struct storvsc_device *stor_device;
- unsigned long flags;
-
- stor_device = hv_get_drvdata(device);
-
- spin_lock_irqsave(&device->channel->inbound_lock, flags);
- stor_device->destroy = true;
- spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
-
- /*
- * At this point, all outbound traffic should be disable. We
- * only allow inbound traffic (responses) to proceed so that
- * outstanding requests can be completed.
- */
-
- storvsc_wait_to_drain(stor_device);
-
- /*
- * Since we have already drained, we don't need to busy wait
- * as was done in final_release_stor_device()
- * Note that we cannot set the ext pointer to NULL until
- * we have drained - to drain the outgoing packets, we need to
- * allow incoming packets.
- */
- spin_lock_irqsave(&device->channel->inbound_lock, flags);
- hv_set_drvdata(device, NULL);
- spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
-
- /* Close the channel */
- vmbus_close(device->channel);
-
- kfree(stor_device);
- return 0;
-}
-
-static int storvsc_do_io(struct hv_device *device,
- struct hv_storvsc_request *request)
-{
- struct storvsc_device *stor_device;
- struct vstor_packet *vstor_packet;
- int ret = 0;
-
- vstor_packet = &request->vstor_packet;
- stor_device = get_out_stor_device(device);
-
- if (!stor_device)
- return -ENODEV;
-
-
- request->device = device;
-
-
- vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
-
- vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
-
-
- vstor_packet->vm_srb.sense_info_length = SENSE_BUFFER_SIZE;
-
-
- vstor_packet->vm_srb.data_transfer_length =
- request->data_buffer.len;
-
- vstor_packet->operation = VSTOR_OPERATION_EXECUTE_SRB;
-
- if (request->data_buffer.len) {
- ret = vmbus_sendpacket_multipagebuffer(device->channel,
- &request->data_buffer,
- vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request);
- } else {
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- }
-
- if (ret != 0)
- return ret;
-
- atomic_inc(&stor_device->num_outstanding_req);
-
- return ret;
-}
-
-static void storvsc_get_ide_info(struct hv_device *dev, int *target, int *path)
-{
- *target =
- dev->dev_instance.b[5] << 8 | dev->dev_instance.b[4];
-
- *path =
- dev->dev_instance.b[3] << 24 |
- dev->dev_instance.b[2] << 16 |
- dev->dev_instance.b[1] << 8 | dev->dev_instance.b[0];
-}
-
-
-static int storvsc_device_alloc(struct scsi_device *sdevice)
-{
- /*
- * This enables luns to be located sparsely. Otherwise, we may not
- * discovered them.
- */
- sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
- return 0;
-}
-
-static int storvsc_merge_bvec(struct request_queue *q,
- struct bvec_merge_data *bmd, struct bio_vec *bvec)
-{
- /* checking done by caller. */
- return bvec->bv_len;
-}
-
-static int storvsc_device_configure(struct scsi_device *sdevice)
-{
- scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
- STORVSC_MAX_IO_REQUESTS);
-
- blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
-
- blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
-
- blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
-
- return 0;
-}
-
-static void destroy_bounce_buffer(struct scatterlist *sgl,
- unsigned int sg_count)
-{
- int i;
- struct page *page_buf;
-
- for (i = 0; i < sg_count; i++) {
- page_buf = sg_page((&sgl[i]));
- if (page_buf != NULL)
- __free_page(page_buf);
- }
-
- kfree(sgl);
-}
-
-static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
-{
- int i;
-
- /* No need to check */
- if (sg_count < 2)
- return -1;
-
- /* We have at least 2 sg entries */
- for (i = 0; i < sg_count; i++) {
- if (i == 0) {
- /* make sure 1st one does not have hole */
- if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
- return i;
- } else if (i == sg_count - 1) {
- /* make sure last one does not have hole */
- if (sgl[i].offset != 0)
- return i;
- } else {
- /* make sure no hole in the middle */
- if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
- return i;
- }
- }
- return -1;
-}
-
-static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
- unsigned int sg_count,
- unsigned int len)
-{
- int i;
- int num_pages;
- struct scatterlist *bounce_sgl;
- struct page *page_buf;
-
- num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
-
- bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
- if (!bounce_sgl)
- return NULL;
-
- for (i = 0; i < num_pages; i++) {
- page_buf = alloc_page(GFP_ATOMIC);
- if (!page_buf)
- goto cleanup;
- sg_set_page(&bounce_sgl[i], page_buf, 0, 0);
- }
-
- return bounce_sgl;
-
-cleanup:
- destroy_bounce_buffer(bounce_sgl, num_pages);
- return NULL;
-}
-
-
-/* Assume the original sgl has enough room */
-static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl,
- struct scatterlist *bounce_sgl,
- unsigned int orig_sgl_count)
-{
- int i;
- int j = 0;
- unsigned long src, dest;
- unsigned int srclen, destlen, copylen;
- unsigned int total_copied = 0;
- unsigned long bounce_addr = 0;
- unsigned long dest_addr = 0;
- unsigned long flags;
-
- local_irq_save(flags);
-
- for (i = 0; i < orig_sgl_count; i++) {
- dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
- KM_IRQ0) + orig_sgl[i].offset;
- dest = dest_addr;
- destlen = orig_sgl[i].length;
-
- if (bounce_addr == 0)
- bounce_addr =
- (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
- KM_IRQ0);
-
- while (destlen) {
- src = bounce_addr + bounce_sgl[j].offset;
- srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
-
- copylen = min(srclen, destlen);
- memcpy((void *)dest, (void *)src, copylen);
-
- total_copied += copylen;
- bounce_sgl[j].offset += copylen;
- destlen -= copylen;
- dest += copylen;
-
- if (bounce_sgl[j].offset == bounce_sgl[j].length) {
- /* full */
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
- j++;
-
- /* if we need to use another bounce buffer */
- if (destlen || i != orig_sgl_count - 1)
- bounce_addr =
- (unsigned long)kmap_atomic(
- sg_page((&bounce_sgl[j])), KM_IRQ0);
- } else if (destlen == 0 && i == orig_sgl_count - 1) {
- /* unmap the last bounce that is < PAGE_SIZE */
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
- }
- }
-
- kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset),
- KM_IRQ0);
- }
-
- local_irq_restore(flags);
-
- return total_copied;
-}
-
-
-/* Assume the bounce_sgl has enough room ie using the create_bounce_buffer() */
-static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
- struct scatterlist *bounce_sgl,
- unsigned int orig_sgl_count)
-{
- int i;
- int j = 0;
- unsigned long src, dest;
- unsigned int srclen, destlen, copylen;
- unsigned int total_copied = 0;
- unsigned long bounce_addr = 0;
- unsigned long src_addr = 0;
- unsigned long flags;
-
- local_irq_save(flags);
-
- for (i = 0; i < orig_sgl_count; i++) {
- src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])),
- KM_IRQ0) + orig_sgl[i].offset;
- src = src_addr;
- srclen = orig_sgl[i].length;
-
- if (bounce_addr == 0)
- bounce_addr =
- (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
- KM_IRQ0);
-
- while (srclen) {
- /* assume bounce offset always == 0 */
- dest = bounce_addr + bounce_sgl[j].length;
- destlen = PAGE_SIZE - bounce_sgl[j].length;
-
- copylen = min(srclen, destlen);
- memcpy((void *)dest, (void *)src, copylen);
-
- total_copied += copylen;
- bounce_sgl[j].length += copylen;
- srclen -= copylen;
- src += copylen;
-
- if (bounce_sgl[j].length == PAGE_SIZE) {
- /* full..move to next entry */
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
- j++;
-
- /* if we need to use another bounce buffer */
- if (srclen || i != orig_sgl_count - 1)
- bounce_addr =
- (unsigned long)kmap_atomic(
- sg_page((&bounce_sgl[j])), KM_IRQ0);
-
- } else if (srclen == 0 && i == orig_sgl_count - 1) {
- /* unmap the last bounce that is < PAGE_SIZE */
- kunmap_atomic((void *)bounce_addr, KM_IRQ0);
- }
- }
-
- kunmap_atomic((void *)(src_addr - orig_sgl[i].offset), KM_IRQ0);
- }
-
- local_irq_restore(flags);
-
- return total_copied;
-}
-
-
-static int storvsc_remove(struct hv_device *dev)
-{
- struct storvsc_device *stor_device = hv_get_drvdata(dev);
- struct Scsi_Host *host = stor_device->host;
- struct hv_host_device *host_dev =
- (struct hv_host_device *)host->hostdata;
-
- scsi_remove_host(host);
-
- scsi_host_put(host);
-
- storvsc_dev_remove(dev);
- if (host_dev->request_pool) {
- kmem_cache_destroy(host_dev->request_pool);
- host_dev->request_pool = NULL;
- }
- return 0;
-}
-
-
-static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
- sector_t capacity, int *info)
-{
- sector_t nsect = capacity;
- sector_t cylinders = nsect;
- int heads, sectors_pt;
-
- /*
- * We are making up these values; let us keep it simple.
- */
- heads = 0xff;
- sectors_pt = 0x3f; /* Sectors per track */
- sector_div(cylinders, heads * sectors_pt);
- if ((sector_t)(cylinders + 1) * heads * sectors_pt < nsect)
- cylinders = 0xffff;
-
- info[0] = heads;
- info[1] = sectors_pt;
- info[2] = (int)cylinders;
-
- return 0;
-}
-
-static int storvsc_host_reset(struct hv_device *device)
-{
- struct storvsc_device *stor_device;
- struct hv_storvsc_request *request;
- struct vstor_packet *vstor_packet;
- int ret, t;
-
-
- stor_device = get_out_stor_device(device);
- if (!stor_device)
- return -ENODEV;
-
- request = &stor_device->reset_request;
- vstor_packet = &request->vstor_packet;
-
- init_completion(&request->wait_event);
-
- vstor_packet->operation = VSTOR_OPERATION_RESET_BUS;
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
- vstor_packet->vm_srb.path_id = stor_device->path_id;
-
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)&stor_device->reset_request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
- if (ret != 0)
- goto cleanup;
-
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
- }
-
-
- /*
- * At this point, all outstanding requests in the adapter
- * should have been flushed out and return to us
- */
-
-cleanup:
- return ret;
-}
-
-
-/*
- * storvsc_host_reset_handler - Reset the scsi HBA
- */
-static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
-{
- int ret;
- struct hv_host_device *host_dev =
- (struct hv_host_device *)scmnd->device->host->hostdata;
- struct hv_device *dev = host_dev->dev;
-
- ret = storvsc_host_reset(dev);
- if (ret != 0)
- return ret;
-
- return ret;
-}
-
-
-/*
- * storvsc_command_completion - Command completion processing
- */
-static void storvsc_command_completion(struct hv_storvsc_request *request)
-{
- struct storvsc_cmd_request *cmd_request =
- (struct storvsc_cmd_request *)request->context;
- struct scsi_cmnd *scmnd = cmd_request->cmd;
- struct hv_host_device *host_dev =
- (struct hv_host_device *)scmnd->device->host->hostdata;
- void (*scsi_done_fn)(struct scsi_cmnd *);
- struct scsi_sense_hdr sense_hdr;
- struct vmscsi_request *vm_srb;
-
- vm_srb = &request->vstor_packet.vm_srb;
- if (cmd_request->bounce_sgl_count) {
- if (vm_srb->data_in == READ_TYPE) {
- copy_from_bounce_buffer(scsi_sglist(scmnd),
- cmd_request->bounce_sgl,
- scsi_sg_count(scmnd));
- destroy_bounce_buffer(cmd_request->bounce_sgl,
- cmd_request->bounce_sgl_count);
- }
- }
-
- /*
- * If there is an error; offline the device since all
- * error recovery strategies would have already been
- * deployed on the host side.
- */
- if (vm_srb->srb_status == 0x4)
- scmnd->result = DID_TARGET_FAILURE << 16;
- else
- scmnd->result = vm_srb->scsi_status;
-
- if (scmnd->result) {
- if (scsi_normalize_sense(scmnd->sense_buffer,
- SCSI_SENSE_BUFFERSIZE, &sense_hdr))
- scsi_print_sense_hdr("storvsc", &sense_hdr);
- }
-
- scsi_set_resid(scmnd,
- request->data_buffer.len -
- vm_srb->data_transfer_length);
-
- scsi_done_fn = scmnd->scsi_done;
-
- scmnd->host_scribble = NULL;
- scmnd->scsi_done = NULL;
-
- scsi_done_fn(scmnd);
-
- kmem_cache_free(host_dev->request_pool, cmd_request);
-}
-
-static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
-{
- bool allowed = true;
- u8 scsi_op = scmnd->cmnd[0];
-
- switch (scsi_op) {
- /* smartd sends this command, which will offline the device */
- case SET_WINDOW:
- scmnd->result = DID_ERROR << 16;
- allowed = false;
- break;
- default:
- break;
- }
- return allowed;
-}
-
-/*
- * storvsc_queuecommand - Initiate command processing
- */
-static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
- void (*done)(struct scsi_cmnd *))
-{
- int ret;
- struct hv_host_device *host_dev =
- (struct hv_host_device *)scmnd->device->host->hostdata;
- struct hv_device *dev = host_dev->dev;
- struct hv_storvsc_request *request;
- struct storvsc_cmd_request *cmd_request;
- unsigned int request_size = 0;
- int i;
- struct scatterlist *sgl;
- unsigned int sg_count = 0;
- struct vmscsi_request *vm_srb;
-
- if (storvsc_check_scsi_cmd(scmnd) == false) {
- done(scmnd);
- return 0;
- }
-
- /* If retrying, no need to prep the cmd */
- if (scmnd->host_scribble) {
-
- cmd_request =
- (struct storvsc_cmd_request *)scmnd->host_scribble;
-
- goto retry_request;
- }
-
- scmnd->scsi_done = done;
-
- request_size = sizeof(struct storvsc_cmd_request);
-
- cmd_request = kmem_cache_zalloc(host_dev->request_pool,
- GFP_ATOMIC);
- if (!cmd_request) {
- scmnd->scsi_done = NULL;
- return SCSI_MLQUEUE_DEVICE_BUSY;
- }
-
- /* Setup the cmd request */
- cmd_request->bounce_sgl_count = 0;
- cmd_request->bounce_sgl = NULL;
- cmd_request->cmd = scmnd;
-
- scmnd->host_scribble = (unsigned char *)cmd_request;
-
- request = &cmd_request->request;
- vm_srb = &request->vstor_packet.vm_srb;
-
-
- /* Build the SRB */
- switch (scmnd->sc_data_direction) {
- case DMA_TO_DEVICE:
- vm_srb->data_in = WRITE_TYPE;
- break;
- case DMA_FROM_DEVICE:
- vm_srb->data_in = READ_TYPE;
- break;
- default:
- vm_srb->data_in = UNKNOWN_TYPE;
- break;
- }
-
- request->on_io_completion = storvsc_command_completion;
- request->context = cmd_request;/* scmnd; */
-
- vm_srb->port_number = host_dev->port;
- vm_srb->path_id = scmnd->device->channel;
- vm_srb->target_id = scmnd->device->id;
- vm_srb->lun = scmnd->device->lun;
-
- vm_srb->cdb_length = scmnd->cmd_len;
-
- memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
-
- request->sense_buffer = scmnd->sense_buffer;
-
-
- request->data_buffer.len = scsi_bufflen(scmnd);
- if (scsi_sg_count(scmnd)) {
- sgl = (struct scatterlist *)scsi_sglist(scmnd);
- sg_count = scsi_sg_count(scmnd);
-
- /* check if we need to bounce the sgl */
- if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1) {
- cmd_request->bounce_sgl =
- create_bounce_buffer(sgl, scsi_sg_count(scmnd),
- scsi_bufflen(scmnd));
- if (!cmd_request->bounce_sgl) {
- scmnd->scsi_done = NULL;
- scmnd->host_scribble = NULL;
- kmem_cache_free(host_dev->request_pool,
- cmd_request);
-
- return SCSI_MLQUEUE_HOST_BUSY;
- }
-
- cmd_request->bounce_sgl_count =
- ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >>
- PAGE_SHIFT;
-
- if (vm_srb->data_in == WRITE_TYPE)
- copy_to_bounce_buffer(sgl,
- cmd_request->bounce_sgl,
- scsi_sg_count(scmnd));
-
- sgl = cmd_request->bounce_sgl;
- sg_count = cmd_request->bounce_sgl_count;
- }
-
- request->data_buffer.offset = sgl[0].offset;
-
- for (i = 0; i < sg_count; i++)
- request->data_buffer.pfn_array[i] =
- page_to_pfn(sg_page((&sgl[i])));
-
- } else if (scsi_sglist(scmnd)) {
- request->data_buffer.offset =
- virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
- request->data_buffer.pfn_array[0] =
- virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
- }
-
-retry_request:
- /* Invokes the vsc to start an IO */
- ret = storvsc_do_io(dev, &cmd_request->request);
-
- if (ret == -EAGAIN) {
- /* no more space */
-
- if (cmd_request->bounce_sgl_count)
- destroy_bounce_buffer(cmd_request->bounce_sgl,
- cmd_request->bounce_sgl_count);
-
- kmem_cache_free(host_dev->request_pool, cmd_request);
-
- scmnd->scsi_done = NULL;
- scmnd->host_scribble = NULL;
-
- ret = SCSI_MLQUEUE_DEVICE_BUSY;
- }
-
- return ret;
-}
-
-static DEF_SCSI_QCMD(storvsc_queuecommand)
-
-
-/* Scsi driver */
-static struct scsi_host_template scsi_driver = {
- .module = THIS_MODULE,
- .name = "storvsc_host_t",
- .bios_param = storvsc_get_chs,
- .queuecommand = storvsc_queuecommand,
- .eh_host_reset_handler = storvsc_host_reset_handler,
- .slave_alloc = storvsc_device_alloc,
- .slave_configure = storvsc_device_configure,
- .cmd_per_lun = 1,
- /* 64 max_queue * 1 target */
- .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
- .this_id = -1,
- /* no use setting to 0 since ll_blk_rw reset it to 1 */
- /* currently 32 */
- .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
- /*
- * ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
- * into 1 sg element. If set, we must limit the max_segment_size to
- * PAGE_SIZE, otherwise we may get 1 sg element that represents
- * multiple
- */
- /* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
- .use_clustering = ENABLE_CLUSTERING,
- /* Make sure we dont get a sg segment crosses a page boundary */
- .dma_boundary = PAGE_SIZE-1,
-};
-
-enum {
- SCSI_GUID,
- IDE_GUID,
-};
-
-static const struct hv_vmbus_device_id id_table[] = {
- /* SCSI guid */
- { VMBUS_DEVICE(0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
- 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
- .driver_data = SCSI_GUID },
- /* IDE guid */
- { VMBUS_DEVICE(0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
- 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
- .driver_data = IDE_GUID },
- { },
-};
-
-MODULE_DEVICE_TABLE(vmbus, id_table);
-
-
-/*
- * storvsc_probe - Add a new device for this driver
- */
-
-static int storvsc_probe(struct hv_device *device,
- const struct hv_vmbus_device_id *dev_id)
-{
- int ret;
- struct Scsi_Host *host;
- struct hv_host_device *host_dev;
- bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
- int path = 0;
- int target = 0;
- struct storvsc_device *stor_device;
-
- host = scsi_host_alloc(&scsi_driver,
- sizeof(struct hv_host_device));
- if (!host)
- return -ENOMEM;
-
- host_dev = (struct hv_host_device *)host->hostdata;
- memset(host_dev, 0, sizeof(struct hv_host_device));
-
- host_dev->port = host->host_no;
- host_dev->dev = device;
-
- host_dev->request_pool =
- kmem_cache_create(dev_name(&device->device),
- sizeof(struct storvsc_cmd_request), 0,
- SLAB_HWCACHE_ALIGN, NULL);
-
- if (!host_dev->request_pool) {
- scsi_host_put(host);
- return -ENOMEM;
- }
-
- stor_device = kzalloc(sizeof(struct storvsc_device), GFP_KERNEL);
- if (!stor_device) {
- kmem_cache_destroy(host_dev->request_pool);
- scsi_host_put(host);
- return -ENOMEM;
- }
-
- stor_device->destroy = false;
- init_waitqueue_head(&stor_device->waiting_to_drain);
- stor_device->device = device;
- stor_device->host = host;
- hv_set_drvdata(device, stor_device);
-
- stor_device->port_number = host->host_no;
- ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size);
- if (ret) {
- kmem_cache_destroy(host_dev->request_pool);
- scsi_host_put(host);
- kfree(stor_device);
- return ret;
- }
-
- if (dev_is_ide)
- storvsc_get_ide_info(device, &target, &path);
-
- host_dev->path = stor_device->path_id;
- host_dev->target = stor_device->target_id;
-
- /* max # of devices per target */
- host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
- /* max # of targets per channel */
- host->max_id = STORVSC_MAX_TARGETS;
- /* max # of channels */
- host->max_channel = STORVSC_MAX_CHANNELS - 1;
- /* max cmd length */
- host->max_cmd_len = STORVSC_MAX_CMD_LEN;
-
- /* Register the HBA and start the scsi bus scan */
- ret = scsi_add_host(host, &device->device);
- if (ret != 0)
- goto err_out;
-
- if (!dev_is_ide) {
- scsi_scan_host(host);
- return 0;
- }
- ret = scsi_add_device(host, 0, target, 0);
- if (ret) {
- scsi_remove_host(host);
- goto err_out;
- }
- return 0;
-
-err_out:
- storvsc_dev_remove(device);
- kmem_cache_destroy(host_dev->request_pool);
- scsi_host_put(host);
- return -ENODEV;
-}
-
-/* The one and only one */
-
-static struct hv_driver storvsc_drv = {
- .name = "storvsc",
- .id_table = id_table,
- .probe = storvsc_probe,
- .remove = storvsc_remove,
-};
-
-static int __init storvsc_drv_init(void)
-{
- u32 max_outstanding_req_per_channel;
-
- /*
- * Divide the ring buffer data size (which is 1 page less
- * than the ring buffer size since that page is reserved for
- * the ring buffer indices) by the max request size (which is
- * vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
- */
- max_outstanding_req_per_channel =
- ((storvsc_ringbuffer_size - PAGE_SIZE) /
- ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
- sizeof(struct vstor_packet) + sizeof(u64),
- sizeof(u64)));
-
- if (max_outstanding_req_per_channel <
- STORVSC_MAX_IO_REQUESTS)
- return -EINVAL;
-
- return vmbus_driver_register(&storvsc_drv);
-}
-
-static void __exit storvsc_drv_exit(void)
-{
- vmbus_driver_unregister(&storvsc_drv);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(HV_DRV_VERSION);
-MODULE_DESCRIPTION("Microsoft Hyper-V virtual storage driver");
-module_init(storvsc_drv_init);
-module_exit(storvsc_drv_exit);
--
1.7.4.1
--
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