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Message-Id: <1327599515-12679-1-git-send-email-kys@microsoft.com>
Date: Thu, 26 Jan 2012 09:38:34 -0800
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, hch@...radead.org,
linux-scsi@...r.kernel.org
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/2] Staging: hv: Applied all the patches already in the staging queue
This patch gets the storage driver to the same level as in the staging tree.
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
drivers/staging/hv/storvsc_drv.c | 1301 ++++++++++++++++++-------------------
1 files changed, 633 insertions(+), 668 deletions(-)
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index ddbdec8..695ffc3 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -42,56 +42,23 @@
#include <scsi/scsi_devinfo.h>
#include <scsi/scsi_dbg.h>
+/*
+ * All wire protocol details (storage protocol between the guest and the host)
+ * are consolidated here.
+ *
+ * Begin protocol definitions.
+ */
-#define STORVSC_MIN_BUF_NR 64
-#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(4, 2)
-
-
-
+/*
+ * Version history:
+ * V1 Beta: 0.1
+ * V1 RC < 2008/1/31: 1.0
+ * V1 RC > 2008/1/31: 2.0
+ * Win7: 4.2
+ */
-/* 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)))
+#define VMSTOR_CURRENT_MAJOR 4
+#define VMSTOR_CURRENT_MINOR 2
/* Packet structure describing virtual storage requests. */
@@ -115,35 +82,31 @@ enum vstor_packet_operation {
* 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
+#define STORVSC_MAX_CMD_LEN 0x10
+#define STORVSC_SENSE_BUFFER_SIZE 0x12
+#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
struct vmscsi_request {
- unsigned short length;
- unsigned char srb_status;
- unsigned char scsi_status;
+ u16 length;
+ u8 srb_status;
+ u8 scsi_status;
- unsigned char port_number;
- unsigned char path_id;
- unsigned char target_id;
- unsigned char lun;
+ u8 port_number;
+ u8 path_id;
+ u8 target_id;
+ u8 lun;
- unsigned char cdb_length;
- unsigned char sense_info_length;
- unsigned char data_in;
- unsigned char reserved;
+ u8 cdb_length;
+ u8 sense_info_length;
+ u8 data_in;
+ u8 reserved;
- unsigned int data_transfer_length;
+ u32 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];
+ u8 cdb[STORVSC_MAX_CMD_LEN];
+ u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
+ u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
};
} __attribute((packed));
@@ -153,32 +116,36 @@ struct vmscsi_request {
* properties of the channel.
*/
struct vmstorage_channel_properties {
- unsigned short protocol_version;
- unsigned char path_id;
- unsigned char target_id;
+ u16 protocol_version;
+ u8 path_id;
+ u8 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;
+ u32 port_number;
+ u32 flags;
+ u32 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;
+ /*
+ * This id is unique for each channel and will correspond with
+ * vendor specific data in the inquiry data.
+ */
+
+ u64 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;
+ u16 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.
+ * This is only used on the windows side. Just set it to 0.
*/
- unsigned short revision;
+ u16 revision;
} __packed;
/* Channel Property Flags */
@@ -190,10 +157,10 @@ struct vstor_packet {
enum vstor_packet_operation operation;
/* Flags - see below for values */
- unsigned int flags;
+ u32 flags;
/* Status of the request returned from the server side. */
- unsigned int status;
+ u32 status;
/* Data payload area */
union {
@@ -211,18 +178,47 @@ struct vstor_packet {
};
} __packed;
-/* Packet flags */
/*
+ * 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)
+/* Matches Windows-end */
+enum storvsc_request_type {
+ WRITE_TYPE = 0,
+ READ_TYPE,
+ UNKNOWN_TYPE,
+};
+
+/*
+ * SRB status codes and masks; a subset of the codes used here.
+ */
+
+#define SRB_STATUS_AUTOSENSE_VALID 0x80
+#define SRB_STATUS_INVALID_LUN 0x20
+#define SRB_STATUS_SUCCESS 0x01
+#define SRB_STATUS_ERROR 0x04
+
+/*
+ * This is the end of Protocol specific defines.
+ */
+
+
+/*
+ * We setup a mempool to allocate request structures for this driver
+ * on a per-lun basis. The following define specifies the number of
+ * elements in the pool.
+ */
+#define STORVSC_MIN_BUF_NR 64
+static int storvsc_ringbuffer_size = (20 * PAGE_SIZE);
-/* Defines */
+module_param(storvsc_ringbuffer_size, int, S_IRUGO);
+MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
#define STORVSC_MAX_IO_REQUESTS 128
@@ -235,27 +231,23 @@ struct vstor_packet {
#define STORVSC_MAX_LUNS_PER_TARGET 64
#define STORVSC_MAX_TARGETS 1
#define STORVSC_MAX_CHANNELS 1
-#define STORVSC_MAX_CMD_LEN 16
-/* Matches Windows-end */
-enum storvsc_request_type {
- WRITE_TYPE,
- READ_TYPE,
- UNKNOWN_TYPE,
-};
-struct hv_storvsc_request {
+struct storvsc_cmd_request {
+ struct list_head entry;
+ struct scsi_cmnd *cmd;
+
+ unsigned int bounce_sgl_count;
+ struct scatterlist *bounce_sgl;
+
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;
};
@@ -281,8 +273,8 @@ struct storvsc_device {
unsigned char target_id;
/* Used for vsc/vsp channel reset process */
- struct hv_storvsc_request init_request;
- struct hv_storvsc_request reset_request;
+ struct storvsc_cmd_request init_request;
+ struct storvsc_cmd_request reset_request;
};
struct stor_mem_pools {
@@ -297,16 +289,6 @@ struct hv_host_device {
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;
-};
-
struct storvsc_scan_work {
struct work_struct work;
struct Scsi_Host *host;
@@ -352,6 +334,34 @@ done:
kfree(wrk);
}
+/*
+ * 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).
+ */
+
+static inline u16 storvsc_get_version(u8 major, u8 minor)
+{
+ u16 version;
+
+ version = ((major << 8) | minor);
+ return version;
+}
+
+/*
+ * We can get incoming messages from the host that are not in response to
+ * messages that we have sent out. An example of this would be messages
+ * received by the guest to notify dynamic addition/removal of LUNs. To
+ * deal with potential race conditions where the driver may be in the
+ * midst of being unloaded when we might receive an unsolicited message
+ * from the host, we have implemented a mechanism to gurantee sequential
+ * consistency:
+ *
+ * 1) Once the device is marked as being destroyed, we will fail all
+ * outgoing messages.
+ * 2) We permit incoming messages when the device is being destroyed,
+ * only to properly account for messages already sent out.
+ */
+
static inline struct storvsc_device *get_out_stor_device(
struct hv_device *device)
{
@@ -398,116 +408,342 @@ get_in_err:
}
-static int storvsc_channel_init(struct hv_device *device)
+static void destroy_bounce_buffer(struct scatterlist *sgl,
+ unsigned int sg_count)
{
- struct storvsc_device *stor_device;
- struct hv_storvsc_request *request;
- struct vstor_packet *vstor_packet;
- int ret, t;
+ int i;
+ struct page *page_buf;
- stor_device = get_out_stor_device(device);
- if (!stor_device)
- return -ENODEV;
+ for (i = 0; i < sg_count; i++) {
+ page_buf = sg_page((&sgl[i]));
+ if (page_buf != NULL)
+ __free_page(page_buf);
+ }
- request = &stor_device->init_request;
- vstor_packet = &request->vstor_packet;
+ kfree(sgl);
+}
- /*
- * 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;
+static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
+{
+ int i;
- 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;
+ /* No need to check */
+ if (sg_count < 2)
+ return -1;
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
+ /* 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;
+}
- 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;
+static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
+ unsigned int sg_count,
+ unsigned int len,
+ int write)
+{
+ int i;
+ int num_pages;
+ struct scatterlist *bounce_sgl;
+ struct page *page_buf;
+ unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
- vstor_packet->version.major_minor = VMSTOR_PROTOCOL_VERSION_CURRENT;
- FILL_VMSTOR_REVISION(vstor_packet->version.revision);
+ num_pages = ALIGN(len, PAGE_SIZE) >> PAGE_SHIFT;
- 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;
+ bounce_sgl = kcalloc(num_pages, sizeof(struct scatterlist), GFP_ATOMIC);
+ if (!bounce_sgl)
+ return NULL;
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
+ 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, buf_len, 0);
}
- if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
- vstor_packet->status != 0)
- goto cleanup;
-
+ return bounce_sgl;
- 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;
+cleanup:
+ destroy_bounce_buffer(bounce_sgl, num_pages);
+ return NULL;
+}
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+/* 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,
+ unsigned int bounce_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;
- if (ret != 0)
- goto cleanup;
+ local_irq_save(flags);
- t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
- if (t == 0) {
- ret = -ETIMEDOUT;
- goto cleanup;
- }
+ 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 (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
- vstor_packet->status != 0)
- goto cleanup;
+ if (bounce_addr == 0)
+ bounce_addr =
+ (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])),
+ KM_IRQ0);
- stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
- stor_device->target_id
- = vstor_packet->storage_channel_properties.target_id;
+ while (destlen) {
+ src = bounce_addr + bounce_sgl[j].offset;
+ srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
- memset(vstor_packet, 0, sizeof(struct vstor_packet));
- vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
- vstor_packet->flags = REQUEST_COMPLETION_FLAG;
+ copylen = min(srclen, destlen);
+ memcpy((void *)dest, (void *)src, copylen);
- ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
- (unsigned long)request,
- VM_PKT_DATA_INBAND,
- VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+ total_copied += copylen;
+ bounce_sgl[j].offset += copylen;
+ destlen -= copylen;
+ dest += copylen;
- if (ret != 0)
- goto cleanup;
+ if (bounce_sgl[j].offset == bounce_sgl[j].length) {
+ /* full */
+ kunmap_atomic((void *)bounce_addr, KM_IRQ0);
+ j++;
+
+ /*
+ * It is possible that the number of elements
+ * in the bounce buffer may not be equal to
+ * the number of elements in the original
+ * scatter list. Handle this correctly.
+ */
+
+ if (j == bounce_sgl_count) {
+ /*
+ * We are done; cleanup and return.
+ */
+ kunmap_atomic((void *)(dest_addr -
+ orig_sgl[i].offset),
+ KM_IRQ0);
+ local_irq_restore(flags);
+ return total_copied;
+ }
+
+ /* 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_channel_init(struct hv_device *device)
+{
+ struct storvsc_device *stor_device;
+ struct storvsc_cmd_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 storvsc_cmd_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 =
+ storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR);
+
+ /*
+ * The revision number is only used in Windows; set it to 0.
+ */
+ vstor_packet->version.revision = 0;
+
+ 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) {
@@ -524,9 +760,84 @@ cleanup:
return ret;
}
+
+static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
+{
+ struct scsi_cmnd *scmnd = cmd_request->cmd;
+ struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
+ void (*scsi_done_fn)(struct scsi_cmnd *);
+ struct scsi_sense_hdr sense_hdr;
+ struct vmscsi_request *vm_srb;
+ struct storvsc_scan_work *wrk;
+ struct stor_mem_pools *memp = scmnd->device->hostdata;
+
+ vm_srb = &cmd_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),
+ cmd_request->bounce_sgl_count);
+ 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 == SRB_STATUS_ERROR)
+ scmnd->result = DID_TARGET_FAILURE << 16;
+ else
+ scmnd->result = vm_srb->scsi_status;
+
+ /*
+ * If the LUN is invalid; remove the device.
+ */
+ if (vm_srb->srb_status == SRB_STATUS_INVALID_LUN) {
+ struct storvsc_device *stor_dev;
+ struct hv_device *dev = host_dev->dev;
+ struct Scsi_Host *host;
+
+ stor_dev = get_in_stor_device(dev);
+ host = stor_dev->host;
+
+ wrk = kmalloc(sizeof(struct storvsc_scan_work),
+ GFP_ATOMIC);
+ if (!wrk) {
+ scmnd->result = DID_TARGET_FAILURE << 16;
+ } else {
+ wrk->host = host;
+ wrk->lun = vm_srb->lun;
+ INIT_WORK(&wrk->work, storvsc_remove_lun);
+ schedule_work(&wrk->work);
+ }
+ }
+
+ 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,
+ cmd_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);
+
+ mempool_free(cmd_request, memp->request_mempool);
+}
+
static void storvsc_on_io_completion(struct hv_device *device,
struct vstor_packet *vstor_packet,
- struct hv_storvsc_request *request)
+ struct storvsc_cmd_request *request)
{
struct storvsc_device *stor_device;
struct vstor_packet *stor_pkt;
@@ -546,9 +857,9 @@ static void storvsc_on_io_completion(struct hv_device *device,
*/
if ((stor_pkt->vm_srb.cdb[0] == INQUIRY) ||
- (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
+ (stor_pkt->vm_srb.cdb[0] == MODE_SENSE)) {
vstor_packet->vm_srb.scsi_status = 0;
- vstor_packet->vm_srb.srb_status = 0x1;
+ vstor_packet->vm_srb.srb_status = SRB_STATUS_SUCCESS;
}
@@ -559,7 +870,7 @@ static void storvsc_on_io_completion(struct hv_device *device,
vstor_packet->vm_srb.sense_info_length;
if (vstor_packet->vm_srb.scsi_status != 0 ||
- vstor_packet->vm_srb.srb_status != 1){
+ vstor_packet->vm_srb.srb_status != SRB_STATUS_SUCCESS){
dev_warn(&device->device,
"cmd 0x%x scsi status 0x%x srb status 0x%x\n",
stor_pkt->vm_srb.cdb[0],
@@ -569,7 +880,8 @@ static void storvsc_on_io_completion(struct hv_device *device,
if ((vstor_packet->vm_srb.scsi_status & 0xFF) == 0x02) {
/* CHECK_CONDITION */
- if (vstor_packet->vm_srb.srb_status & 0x80) {
+ if (vstor_packet->vm_srb.srb_status &
+ SRB_STATUS_AUTOSENSE_VALID) {
/* autosense data available */
dev_warn(&device->device,
"stor pkt %p autosense data valid - len %d\n",
@@ -586,7 +898,7 @@ static void storvsc_on_io_completion(struct hv_device *device,
stor_pkt->vm_srb.data_transfer_length =
vstor_packet->vm_srb.data_transfer_length;
- request->on_io_completion(request);
+ storvsc_command_completion(request);
if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
stor_device->drain_notify)
@@ -597,7 +909,7 @@ static void storvsc_on_io_completion(struct hv_device *device,
static void storvsc_on_receive(struct hv_device *device,
struct vstor_packet *vstor_packet,
- struct hv_storvsc_request *request)
+ struct storvsc_cmd_request *request)
{
struct storvsc_scan_work *work;
struct storvsc_device *stor_device;
@@ -631,7 +943,7 @@ static void storvsc_on_channel_callback(void *context)
u32 bytes_recvd;
u64 request_id;
unsigned char packet[ALIGN(sizeof(struct vstor_packet), 8)];
- struct hv_storvsc_request *request;
+ struct storvsc_cmd_request *request;
int ret;
@@ -645,7 +957,7 @@ static void storvsc_on_channel_callback(void *context)
&bytes_recvd, &request_id);
if (ret == 0 && bytes_recvd > 0) {
- request = (struct hv_storvsc_request *)
+ request = (struct storvsc_cmd_request *)
(unsigned long)request_id;
if ((request == &stor_device->init_request) ||
@@ -674,7 +986,6 @@ static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size)
memset(&props, 0, sizeof(struct vmstorage_channel_properties));
- /* Open the channel */
ret = vmbus_open(device->channel,
ring_size,
ring_size,
@@ -728,7 +1039,7 @@ static int storvsc_dev_remove(struct hv_device *device)
}
static int storvsc_do_io(struct hv_device *device,
- struct hv_storvsc_request *request)
+ struct storvsc_cmd_request *request)
{
struct storvsc_device *stor_device;
struct vstor_packet *vstor_packet;
@@ -749,342 +1060,94 @@ static int storvsc_do_io(struct hv_device *device,
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)
-{
- struct stor_mem_pools *memp;
- int number = STORVSC_MIN_BUF_NR;
-
- memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
- if (!memp)
- return -ENOMEM;
-
- memp->request_pool =
- kmem_cache_create(dev_name(&sdevice->sdev_dev),
- sizeof(struct storvsc_cmd_request), 0,
- SLAB_HWCACHE_ALIGN, NULL);
-
- if (!memp->request_pool)
- goto err0;
-
- memp->request_mempool = mempool_create(number, mempool_alloc_slab,
- mempool_free_slab,
- memp->request_pool);
-
- if (!memp->request_mempool)
- goto err1;
-
- sdevice->hostdata = memp;
-
- return 0;
-
-err1:
- kmem_cache_destroy(memp->request_pool);
-
-err0:
- kfree(memp);
- return -ENOMEM;
-}
-
-static void storvsc_device_destroy(struct scsi_device *sdevice)
-{
- struct stor_mem_pools *memp = sdevice->hostdata;
-
- mempool_destroy(memp->request_mempool);
- kmem_cache_destroy(memp->request_pool);
- kfree(memp);
- sdevice->hostdata = NULL;
-}
-
-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_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 write)
-{
- int i;
- int num_pages;
- struct scatterlist *bounce_sgl;
- struct page *page_buf;
- unsigned int buf_len = ((write == WRITE_TYPE) ? 0 : PAGE_SIZE);
-
- 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, buf_len, 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,
- unsigned int bounce_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])))
- + 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])));
-
- 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);
- j++;
-
- /*
- * It is possible that the number of elements
- * in the bounce buffer may not be equal to
- * the number of elements in the original
- * scatter list. Handle this correctly.
- */
+ vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;
- if (j == bounce_sgl_count) {
- /*
- * We are done; cleanup and return.
- */
- kunmap_atomic((void *)(dest_addr -
- orig_sgl[i].offset),
- KM_IRQ0);
- local_irq_restore(flags);
- return total_copied;
- }
- /* 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])));
- } else if (destlen == 0 && i == orig_sgl_count - 1) {
- /* unmap the last bounce that is < PAGE_SIZE */
- kunmap_atomic((void *)bounce_addr);
- }
- }
+ vstor_packet->vm_srb.data_transfer_length =
+ request->data_buffer.len;
- kunmap_atomic((void *)(dest_addr - orig_sgl[i].offset));
+ 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);
}
- local_irq_restore(flags);
+ if (ret != 0)
+ return ret;
- return total_copied;
-}
+ atomic_inc(&stor_device->num_outstanding_req);
+ return ret;
+}
-/* 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)
+static int storvsc_device_alloc(struct scsi_device *sdevice)
{
- 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);
+ struct stor_mem_pools *memp;
+ int number = STORVSC_MIN_BUF_NR;
- for (i = 0; i < orig_sgl_count; i++) {
- src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])))
- + orig_sgl[i].offset;
- src = src_addr;
- srclen = orig_sgl[i].length;
+ memp = kzalloc(sizeof(struct stor_mem_pools), GFP_KERNEL);
+ if (!memp)
+ return -ENOMEM;
- if (bounce_addr == 0)
- bounce_addr =
- (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])));
+ memp->request_pool =
+ kmem_cache_create(dev_name(&sdevice->sdev_dev),
+ sizeof(struct storvsc_cmd_request), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
- while (srclen) {
- /* assume bounce offset always == 0 */
- dest = bounce_addr + bounce_sgl[j].length;
- destlen = PAGE_SIZE - bounce_sgl[j].length;
+ if (!memp->request_pool)
+ goto err0;
- copylen = min(srclen, destlen);
- memcpy((void *)dest, (void *)src, copylen);
+ memp->request_mempool = mempool_create(number, mempool_alloc_slab,
+ mempool_free_slab,
+ memp->request_pool);
- total_copied += copylen;
- bounce_sgl[j].length += copylen;
- srclen -= copylen;
- src += copylen;
+ if (!memp->request_mempool)
+ goto err1;
- if (bounce_sgl[j].length == PAGE_SIZE) {
- /* full..move to next entry */
- kunmap_atomic((void *)bounce_addr);
- j++;
+ sdevice->hostdata = memp;
- /* 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])));
+ return 0;
- } else if (srclen == 0 && i == orig_sgl_count - 1) {
- /* unmap the last bounce that is < PAGE_SIZE */
- kunmap_atomic((void *)bounce_addr);
- }
- }
+err1:
+ kmem_cache_destroy(memp->request_pool);
- kunmap_atomic((void *)(src_addr - orig_sgl[i].offset));
- }
+err0:
+ kfree(memp);
+ return -ENOMEM;
+}
- local_irq_restore(flags);
+static void storvsc_device_destroy(struct scsi_device *sdevice)
+{
+ struct stor_mem_pools *memp = sdevice->hostdata;
- return total_copied;
+ mempool_destroy(memp->request_mempool);
+ kmem_cache_destroy(memp->request_pool);
+ kfree(memp);
+ sdevice->hostdata = NULL;
}
-
-static int storvsc_remove(struct hv_device *dev)
+static int storvsc_device_configure(struct scsi_device *sdevice)
{
- struct storvsc_device *stor_device = hv_get_drvdata(dev);
- struct Scsi_Host *host = stor_device->host;
-
- scsi_remove_host(host);
+ scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
+ STORVSC_MAX_IO_REQUESTS);
- scsi_host_put(host);
+ blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
- storvsc_dev_remove(dev);
+ blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
return 0;
}
-
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
sector_t capacity, int *info)
{
@@ -1108,10 +1171,13 @@ static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
return 0;
}
-static int storvsc_host_reset(struct hv_device *device)
+static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
{
+ struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
+ struct hv_device *device = host_dev->dev;
+
struct storvsc_device *stor_device;
- struct hv_storvsc_request *request;
+ struct storvsc_cmd_request *request;
struct vstor_packet *vstor_packet;
int ret, t;
@@ -1150,105 +1216,16 @@ static int storvsc_host_reset(struct hv_device *device)
return SUCCESS;
}
-
-/*
- * storvsc_host_reset_handler - Reset the scsi HBA
- */
-static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
-{
- struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
- struct hv_device *dev = host_dev->dev;
-
- return storvsc_host_reset(dev);
-}
-
-
-/*
- * 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 = shost_priv(scmnd->device->host);
- void (*scsi_done_fn)(struct scsi_cmnd *);
- struct scsi_sense_hdr sense_hdr;
- struct vmscsi_request *vm_srb;
- struct storvsc_scan_work *wrk;
- struct stor_mem_pools *memp = scmnd->device->hostdata;
-
- 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),
- cmd_request->bounce_sgl_count);
- 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 the LUN is invalid; remove the device.
- */
- if (vm_srb->srb_status == 0x20) {
- struct storvsc_device *stor_dev;
- struct hv_device *dev = host_dev->dev;
- struct Scsi_Host *host;
-
- stor_dev = get_in_stor_device(dev);
- host = stor_dev->host;
-
- wrk = kmalloc(sizeof(struct storvsc_scan_work),
- GFP_ATOMIC);
- if (!wrk) {
- scmnd->result = DID_TARGET_FAILURE << 16;
- } else {
- wrk->host = host;
- wrk->lun = vm_srb->lun;
- INIT_WORK(&wrk->work, storvsc_remove_lun);
- schedule_work(&wrk->work);
- }
- }
-
- 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);
-
- mempool_free(cmd_request, memp->request_mempool);
-}
-
-static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
+static bool storvsc_scsi_cmd_ok(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 */
+ /*
+ * smartd sends this command and the host does not handle
+ * this. So, don't send it.
+ */
case SET_WINDOW:
scmnd->result = ILLEGAL_REQUEST << 16;
allowed = false;
@@ -1259,15 +1236,11 @@ static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
return allowed;
}
-/*
- * storvsc_queuecommand - Initiate command processing
- */
static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
{
int ret;
struct hv_host_device *host_dev = shost_priv(host);
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;
@@ -1276,38 +1249,31 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
struct vmscsi_request *vm_srb;
struct stor_mem_pools *memp = scmnd->device->hostdata;
- if (storvsc_check_scsi_cmd(scmnd) == false) {
+ if (!storvsc_scsi_cmd_ok(scmnd)) {
scmnd->scsi_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;
- }
-
request_size = sizeof(struct storvsc_cmd_request);
cmd_request = mempool_alloc(memp->request_mempool,
GFP_ATOMIC);
+
+ /*
+ * We might be invoked in an interrupt context; hence
+ * mempool_alloc() can fail.
+ */
if (!cmd_request)
return SCSI_MLQUEUE_DEVICE_BUSY;
memset(cmd_request, 0, sizeof(struct storvsc_cmd_request));
/* 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;
+ vm_srb = &cmd_request->vstor_packet.vm_srb;
/* Build the SRB */
@@ -1323,8 +1289,6 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
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;
@@ -1335,10 +1299,10 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
- request->sense_buffer = scmnd->sense_buffer;
+ cmd_request->sense_buffer = scmnd->sense_buffer;
- request->data_buffer.len = scsi_bufflen(scmnd);
+ cmd_request->data_buffer.len = scsi_bufflen(scmnd);
if (scsi_sg_count(scmnd)) {
sgl = (struct scatterlist *)scsi_sglist(scmnd);
sg_count = scsi_sg_count(scmnd);
@@ -1350,11 +1314,8 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
scsi_bufflen(scmnd),
vm_srb->data_in);
if (!cmd_request->bounce_sgl) {
- scmnd->host_scribble = NULL;
- mempool_free(cmd_request,
- memp->request_mempool);
-
- return SCSI_MLQUEUE_HOST_BUSY;
+ ret = SCSI_MLQUEUE_HOST_BUSY;
+ goto queue_error;
}
cmd_request->bounce_sgl_count =
@@ -1370,41 +1331,42 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
sg_count = cmd_request->bounce_sgl_count;
}
- request->data_buffer.offset = sgl[0].offset;
+ cmd_request->data_buffer.offset = sgl[0].offset;
for (i = 0; i < sg_count; i++)
- request->data_buffer.pfn_array[i] =
+ cmd_request->data_buffer.pfn_array[i] =
page_to_pfn(sg_page((&sgl[i])));
} else if (scsi_sglist(scmnd)) {
- request->data_buffer.offset =
+ cmd_request->data_buffer.offset =
virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
- request->data_buffer.pfn_array[0] =
+ cmd_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);
+ ret = storvsc_do_io(dev, cmd_request);
if (ret == -EAGAIN) {
/* no more space */
- if (cmd_request->bounce_sgl_count)
+ if (cmd_request->bounce_sgl_count) {
destroy_bounce_buffer(cmd_request->bounce_sgl,
cmd_request->bounce_sgl_count);
- mempool_free(cmd_request, memp->request_mempool);
-
- scmnd->host_scribble = NULL;
-
- ret = SCSI_MLQUEUE_DEVICE_BUSY;
+ ret = SCSI_MLQUEUE_DEVICE_BUSY;
+ goto queue_error;
+ }
}
+ return 0;
+
+queue_error:
+ mempool_free(cmd_request, memp->request_mempool);
+ scmnd->host_scribble = NULL;
return ret;
}
-/* Scsi driver */
static struct scsi_host_template scsi_driver = {
.module = THIS_MODULE,
.name = "storvsc_host_t",
@@ -1445,11 +1407,6 @@ static const struct hv_vmbus_device_id id_table[] = {
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)
{
@@ -1457,7 +1414,6 @@ static int storvsc_probe(struct hv_device *device,
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;
@@ -1490,9 +1446,6 @@ static int storvsc_probe(struct hv_device *device,
if (ret)
goto err_out1;
- 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;
@@ -1512,12 +1465,14 @@ static int storvsc_probe(struct hv_device *device,
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_out2;
+ } else {
+ target = (device->dev_instance.b[5] << 8 |
+ device->dev_instance.b[4]);
+ ret = scsi_add_device(host, 0, target, 0);
+ if (ret) {
+ scsi_remove_host(host);
+ goto err_out2;
+ }
}
return 0;
@@ -1539,7 +1494,17 @@ err_out0:
return ret;
}
-/* The one and only one */
+static int storvsc_remove(struct hv_device *dev)
+{
+ struct storvsc_device *stor_device = hv_get_drvdata(dev);
+ struct Scsi_Host *host = stor_device->host;
+
+ scsi_remove_host(host);
+ storvsc_dev_remove(dev);
+ scsi_host_put(host);
+
+ return 0;
+}
static struct hv_driver storvsc_drv = {
.name = KBUILD_MODNAME,
--
1.7.4.1
--
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