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path: root/drivers/scsi/storvsc_drv.c
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Diffstat (limited to 'drivers/scsi/storvsc_drv.c')
-rw-r--r--drivers/scsi/storvsc_drv.c113
1 files changed, 79 insertions, 34 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 9969fa1ef7c4..ed0f899e8aa5 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -33,6 +33,7 @@
#include <linux/device.h>
#include <linux/hyperv.h>
#include <linux/mempool.h>
+#include <linux/blkdev.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
@@ -330,17 +331,17 @@ static int storvsc_timeout = 180;
static void storvsc_on_channel_callback(void *context);
-/*
- * 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_LUNS_PER_TARGET 255
+#define STORVSC_MAX_TARGETS 2
+#define STORVSC_MAX_CHANNELS 8
+#define STORVSC_FC_MAX_LUNS_PER_TARGET 255
+#define STORVSC_FC_MAX_TARGETS 128
+#define STORVSC_FC_MAX_CHANNELS 8
+#define STORVSC_IDE_MAX_LUNS_PER_TARGET 64
+#define STORVSC_IDE_MAX_TARGETS 1
+#define STORVSC_IDE_MAX_CHANNELS 1
struct storvsc_cmd_request {
struct list_head entry;
@@ -1017,6 +1018,13 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
case ATA_12:
set_host_byte(scmnd, DID_PASSTHROUGH);
break;
+ /*
+ * On Some Windows hosts TEST_UNIT_READY command can return
+ * SRB_STATUS_ERROR, let the upper level code deal with it
+ * based on the sense information.
+ */
+ case TEST_UNIT_READY:
+ break;
default:
set_host_byte(scmnd, DID_TARGET_FAILURE);
}
@@ -1518,6 +1526,16 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
return SUCCESS;
}
+/*
+ * The host guarantees to respond to each command, although I/O latencies might
+ * be unbounded on Azure. Reset the timer unconditionally to give the host a
+ * chance to perform EH.
+ */
+static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
+{
+ return BLK_EH_RESET_TIMER;
+}
+
static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
{
bool allowed = true;
@@ -1553,9 +1571,19 @@ 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_scsi_cmd_ok(scmnd)) {
- scmnd->scsi_done(scmnd);
- return 0;
+ if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
+ /*
+ * On legacy hosts filter unimplemented commands.
+ * Future hosts are expected to correctly handle
+ * unsupported commands. Furthermore, it is
+ * possible that some of the currently
+ * unsupported commands maybe supported in
+ * future versions of the host.
+ */
+ if (!storvsc_scsi_cmd_ok(scmnd)) {
+ scmnd->scsi_done(scmnd);
+ return 0;
+ }
}
request_size = sizeof(struct storvsc_cmd_request);
@@ -1580,26 +1608,24 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
vm_srb = &cmd_request->vstor_packet.vm_srb;
vm_srb->win8_extension.time_out_value = 60;
+ vm_srb->win8_extension.srb_flags |=
+ (SRB_FLAGS_QUEUE_ACTION_ENABLE |
+ SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
/* Build the SRB */
switch (scmnd->sc_data_direction) {
case DMA_TO_DEVICE:
vm_srb->data_in = WRITE_TYPE;
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
- vm_srb->win8_extension.srb_flags |=
- (SRB_FLAGS_QUEUE_ACTION_ENABLE |
- SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
break;
case DMA_FROM_DEVICE:
vm_srb->data_in = READ_TYPE;
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
- vm_srb->win8_extension.srb_flags |=
- (SRB_FLAGS_QUEUE_ACTION_ENABLE |
- SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
break;
default:
vm_srb->data_in = UNKNOWN_TYPE;
- vm_srb->win8_extension.srb_flags = 0;
+ vm_srb->win8_extension.srb_flags |= (SRB_FLAGS_DATA_IN |
+ SRB_FLAGS_DATA_OUT);
break;
}
@@ -1687,11 +1713,11 @@ static struct scsi_host_template scsi_driver = {
.bios_param = storvsc_get_chs,
.queuecommand = storvsc_queuecommand,
.eh_host_reset_handler = storvsc_host_reset_handler,
+ .eh_timed_out = storvsc_eh_timed_out,
.slave_alloc = storvsc_device_alloc,
.slave_destroy = storvsc_device_destroy,
.slave_configure = storvsc_device_configure,
- .cmd_per_lun = 1,
- /* 64 max_queue * 1 target */
+ .cmd_per_lun = 255,
.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 */
@@ -1743,19 +1769,25 @@ static int storvsc_probe(struct hv_device *device,
* set state to properly communicate with the host.
*/
- if (vmbus_proto_version == VERSION_WIN8) {
- sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
- vmscsi_size_delta = 0;
- vmstor_current_major = VMSTOR_WIN8_MAJOR;
- vmstor_current_minor = VMSTOR_WIN8_MINOR;
- } else {
+ switch (vmbus_proto_version) {
+ case VERSION_WS2008:
+ case VERSION_WIN7:
sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
vmstor_current_major = VMSTOR_WIN7_MAJOR;
vmstor_current_minor = VMSTOR_WIN7_MINOR;
+ break;
+ default:
+ sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
+ vmscsi_size_delta = 0;
+ vmstor_current_major = VMSTOR_WIN8_MAJOR;
+ vmstor_current_minor = VMSTOR_WIN8_MINOR;
+ break;
}
-
+ if (dev_id->driver_data == SFC_GUID)
+ scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
+ STORVSC_FC_MAX_TARGETS);
host = scsi_host_alloc(&scsi_driver,
sizeof(struct hv_host_device));
if (!host)
@@ -1789,12 +1821,25 @@ static int storvsc_probe(struct hv_device *device,
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;
+ switch (dev_id->driver_data) {
+ case SFC_GUID:
+ host->max_lun = STORVSC_FC_MAX_LUNS_PER_TARGET;
+ host->max_id = STORVSC_FC_MAX_TARGETS;
+ host->max_channel = STORVSC_FC_MAX_CHANNELS - 1;
+ break;
+
+ case SCSI_GUID:
+ host->max_lun = STORVSC_MAX_LUNS_PER_TARGET;
+ host->max_id = STORVSC_MAX_TARGETS;
+ host->max_channel = STORVSC_MAX_CHANNELS - 1;
+ break;
+
+ default:
+ host->max_lun = STORVSC_IDE_MAX_LUNS_PER_TARGET;
+ host->max_id = STORVSC_IDE_MAX_TARGETS;
+ host->max_channel = STORVSC_IDE_MAX_CHANNELS - 1;
+ break;
+ }
/* max cmd length */
host->max_cmd_len = STORVSC_MAX_CMD_LEN;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 23:43:11 +0000