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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 12:10:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 12:10:33 -0700
commit90311148415ab23f5767fbb577a012d4405f12e5 (patch)
treeb66d2fe65409b949bb559d628bcf72c443ef1264 /drivers/scsi/scsi_lib.c
parent3a564bb3a8a6950e18b1f5d209bda39fc3831074 (diff)
parentc345c6ca13825d1a15de5399226802433dd30f8c (diff)
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI updates from James Bottomley: "This is mostly updates of the usual suspects: lpfc, qla2xxx, bnx2fc, qedf, hpsa, hisi_sas, smartpqi, cxlflash, aacraid, csiostor along with a host of minor and miscellaneous changes" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (276 commits) qla2xxx: Fix NVMe entry_type for iocb packet on BE system scsi: qla2xxx: avoid unused-function warning scsi: snic: fix a couple of spelling mistakes/typos scsi: qla2xxx: fix a bunch of typos and spelling mistakes scsi: lpfc: don't double count abort errors scsi: lpfc: spin_lock_irq() is not nestable scsi: hisi_sas: optimise DMA slot memory scsi: ibmvfc: constify dev_pm_ops structures. scsi: ibmvscsi: constify dev_pm_ops structures. scsi: cxlflash: Update debug prints in reset handlers scsi: cxlflash: Update send_tmf() parameters scsi: cxlflash: Avoid double free of character device scsi: Add STARGET_CREATED_REMOVE state to scsi_target_state scsi: ses: do not add a device to an enclosure if enclosure_add_links() fails. scsi: ufs: flush eh_work when eh_work scheduled. scsi: qla2xxx: Protect access to qpair members with qpair->qp_lock scsi: sun_esp: fix device reference leaks scsi: fnic: changing queue command to return result DID_IMM_RETRY when rport is init scsi: fnic: correct speed display and add support for 25,40 and 100G scsi: fnic: added timestamp reporting in fnic debug stats ...
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c306
1 files changed, 191 insertions, 115 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 550e29f903b7..f6097b89d5d3 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -45,23 +45,23 @@ static struct kmem_cache *scsi_sense_isadma_cache;
static DEFINE_MUTEX(scsi_sense_cache_mutex);
static inline struct kmem_cache *
-scsi_select_sense_cache(struct Scsi_Host *shost)
+scsi_select_sense_cache(bool unchecked_isa_dma)
{
- return shost->unchecked_isa_dma ?
- scsi_sense_isadma_cache : scsi_sense_cache;
+ return unchecked_isa_dma ? scsi_sense_isadma_cache : scsi_sense_cache;
}
-static void scsi_free_sense_buffer(struct Scsi_Host *shost,
- unsigned char *sense_buffer)
+static void scsi_free_sense_buffer(bool unchecked_isa_dma,
+ unsigned char *sense_buffer)
{
- kmem_cache_free(scsi_select_sense_cache(shost), sense_buffer);
+ kmem_cache_free(scsi_select_sense_cache(unchecked_isa_dma),
+ sense_buffer);
}
-static unsigned char *scsi_alloc_sense_buffer(struct Scsi_Host *shost,
+static unsigned char *scsi_alloc_sense_buffer(bool unchecked_isa_dma,
gfp_t gfp_mask, int numa_node)
{
- return kmem_cache_alloc_node(scsi_select_sense_cache(shost), gfp_mask,
- numa_node);
+ return kmem_cache_alloc_node(scsi_select_sense_cache(unchecked_isa_dma),
+ gfp_mask, numa_node);
}
int scsi_init_sense_cache(struct Scsi_Host *shost)
@@ -69,7 +69,7 @@ int scsi_init_sense_cache(struct Scsi_Host *shost)
struct kmem_cache *cache;
int ret = 0;
- cache = scsi_select_sense_cache(shost);
+ cache = scsi_select_sense_cache(shost->unchecked_isa_dma);
if (cache)
return 0;
@@ -583,19 +583,9 @@ static void scsi_mq_free_sgtables(struct scsi_cmnd *cmd)
static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
{
- struct scsi_device *sdev = cmd->device;
- struct Scsi_Host *shost = sdev->host;
- unsigned long flags;
-
scsi_mq_free_sgtables(cmd);
scsi_uninit_cmd(cmd);
-
- if (shost->use_cmd_list) {
- BUG_ON(list_empty(&cmd->list));
- spin_lock_irqsave(&sdev->list_lock, flags);
- list_del_init(&cmd->list);
- spin_unlock_irqrestore(&sdev->list_lock, flags);
- }
+ scsi_del_cmd_from_list(cmd);
}
/*
@@ -1129,12 +1119,41 @@ void scsi_initialize_rq(struct request *rq)
}
EXPORT_SYMBOL(scsi_initialize_rq);
+/* Add a command to the list used by the aacraid and dpt_i2o drivers */
+void scsi_add_cmd_to_list(struct scsi_cmnd *cmd)
+{
+ struct scsi_device *sdev = cmd->device;
+ struct Scsi_Host *shost = sdev->host;
+ unsigned long flags;
+
+ if (shost->use_cmd_list) {
+ spin_lock_irqsave(&sdev->list_lock, flags);
+ list_add_tail(&cmd->list, &sdev->cmd_list);
+ spin_unlock_irqrestore(&sdev->list_lock, flags);
+ }
+}
+
+/* Remove a command from the list used by the aacraid and dpt_i2o drivers */
+void scsi_del_cmd_from_list(struct scsi_cmnd *cmd)
+{
+ struct scsi_device *sdev = cmd->device;
+ struct Scsi_Host *shost = sdev->host;
+ unsigned long flags;
+
+ if (shost->use_cmd_list) {
+ spin_lock_irqsave(&sdev->list_lock, flags);
+ BUG_ON(list_empty(&cmd->list));
+ list_del_init(&cmd->list);
+ spin_unlock_irqrestore(&sdev->list_lock, flags);
+ }
+}
+
/* Called after a request has been started. */
void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
{
void *buf = cmd->sense_buffer;
void *prot = cmd->prot_sdb;
- unsigned long flags;
+ unsigned int unchecked_isa_dma = cmd->flags & SCMD_UNCHECKED_ISA_DMA;
/* zero out the cmd, except for the embedded scsi_request */
memset((char *)cmd + sizeof(cmd->req), 0,
@@ -1143,12 +1162,11 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
cmd->device = dev;
cmd->sense_buffer = buf;
cmd->prot_sdb = prot;
+ cmd->flags = unchecked_isa_dma;
INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
cmd->jiffies_at_alloc = jiffies;
- spin_lock_irqsave(&dev->list_lock, flags);
- list_add_tail(&cmd->list, &dev->cmd_list);
- spin_unlock_irqrestore(&dev->list_lock, flags);
+ scsi_add_cmd_to_list(cmd);
}
static int scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req)
@@ -1837,46 +1855,33 @@ static inline blk_status_t prep_to_mq(int ret)
}
}
+/* Size in bytes of the sg-list stored in the scsi-mq command-private data. */
+static unsigned int scsi_mq_sgl_size(struct Scsi_Host *shost)
+{
+ return min_t(unsigned int, shost->sg_tablesize, SG_CHUNK_SIZE) *
+ sizeof(struct scatterlist);
+}
+
static int scsi_mq_prep_fn(struct request *req)
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
struct scsi_device *sdev = req->q->queuedata;
struct Scsi_Host *shost = sdev->host;
- unsigned char *sense_buf = cmd->sense_buffer;
struct scatterlist *sg;
- /* zero out the cmd, except for the embedded scsi_request */
- memset((char *)cmd + sizeof(cmd->req), 0,
- sizeof(*cmd) - sizeof(cmd->req) + shost->hostt->cmd_size);
+ scsi_init_command(sdev, cmd);
req->special = cmd;
cmd->request = req;
- cmd->device = sdev;
- cmd->sense_buffer = sense_buf;
cmd->tag = req->tag;
-
cmd->prot_op = SCSI_PROT_NORMAL;
- INIT_LIST_HEAD(&cmd->list);
- INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
- cmd->jiffies_at_alloc = jiffies;
-
- if (shost->use_cmd_list) {
- spin_lock_irq(&sdev->list_lock);
- list_add_tail(&cmd->list, &sdev->cmd_list);
- spin_unlock_irq(&sdev->list_lock);
- }
-
sg = (void *)cmd + sizeof(struct scsi_cmnd) + shost->hostt->cmd_size;
cmd->sdb.table.sgl = sg;
if (scsi_host_get_prot(shost)) {
- cmd->prot_sdb = (void *)sg +
- min_t(unsigned int,
- shost->sg_tablesize, SG_CHUNK_SIZE) *
- sizeof(struct scatterlist);
memset(cmd->prot_sdb, 0, sizeof(struct scsi_data_buffer));
cmd->prot_sdb->table.sgl =
@@ -2000,23 +2005,34 @@ static int scsi_init_request(struct blk_mq_tag_set *set, struct request *rq,
unsigned int hctx_idx, unsigned int numa_node)
{
struct Scsi_Host *shost = set->driver_data;
+ const bool unchecked_isa_dma = shost->unchecked_isa_dma;
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
+ struct scatterlist *sg;
- cmd->sense_buffer =
- scsi_alloc_sense_buffer(shost, GFP_KERNEL, numa_node);
+ if (unchecked_isa_dma)
+ cmd->flags |= SCMD_UNCHECKED_ISA_DMA;
+ cmd->sense_buffer = scsi_alloc_sense_buffer(unchecked_isa_dma,
+ GFP_KERNEL, numa_node);
if (!cmd->sense_buffer)
return -ENOMEM;
cmd->req.sense = cmd->sense_buffer;
+
+ if (scsi_host_get_prot(shost)) {
+ sg = (void *)cmd + sizeof(struct scsi_cmnd) +
+ shost->hostt->cmd_size;
+ cmd->prot_sdb = (void *)sg + scsi_mq_sgl_size(shost);
+ }
+
return 0;
}
static void scsi_exit_request(struct blk_mq_tag_set *set, struct request *rq,
unsigned int hctx_idx)
{
- struct Scsi_Host *shost = set->driver_data;
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
- scsi_free_sense_buffer(shost, cmd->sense_buffer);
+ scsi_free_sense_buffer(cmd->flags & SCMD_UNCHECKED_ISA_DMA,
+ cmd->sense_buffer);
}
static int scsi_map_queues(struct blk_mq_tag_set *set)
@@ -2091,11 +2107,15 @@ EXPORT_SYMBOL_GPL(__scsi_init_queue);
static int scsi_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp)
{
struct Scsi_Host *shost = q->rq_alloc_data;
+ const bool unchecked_isa_dma = shost->unchecked_isa_dma;
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
memset(cmd, 0, sizeof(*cmd));
- cmd->sense_buffer = scsi_alloc_sense_buffer(shost, gfp, NUMA_NO_NODE);
+ if (unchecked_isa_dma)
+ cmd->flags |= SCMD_UNCHECKED_ISA_DMA;
+ cmd->sense_buffer = scsi_alloc_sense_buffer(unchecked_isa_dma, gfp,
+ NUMA_NO_NODE);
if (!cmd->sense_buffer)
goto fail;
cmd->req.sense = cmd->sense_buffer;
@@ -2109,19 +2129,19 @@ static int scsi_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp)
return 0;
fail_free_sense:
- scsi_free_sense_buffer(shost, cmd->sense_buffer);
+ scsi_free_sense_buffer(unchecked_isa_dma, cmd->sense_buffer);
fail:
return -ENOMEM;
}
static void scsi_exit_rq(struct request_queue *q, struct request *rq)
{
- struct Scsi_Host *shost = q->rq_alloc_data;
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
if (cmd->prot_sdb)
kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb);
- scsi_free_sense_buffer(shost, cmd->sense_buffer);
+ scsi_free_sense_buffer(cmd->flags & SCMD_UNCHECKED_ISA_DMA,
+ cmd->sense_buffer);
}
struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
@@ -2179,12 +2199,9 @@ struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev)
int scsi_mq_setup_tags(struct Scsi_Host *shost)
{
- unsigned int cmd_size, sgl_size, tbl_size;
+ unsigned int cmd_size, sgl_size;
- tbl_size = shost->sg_tablesize;
- if (tbl_size > SG_CHUNK_SIZE)
- tbl_size = SG_CHUNK_SIZE;
- sgl_size = tbl_size * sizeof(struct scatterlist);
+ sgl_size = scsi_mq_sgl_size(shost);
cmd_size = sizeof(struct scsi_cmnd) + shost->hostt->cmd_size + sgl_size;
if (scsi_host_get_prot(shost))
cmd_size += sizeof(struct scsi_data_buffer) + sgl_size;
@@ -2614,7 +2631,6 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
case SDEV_QUIESCE:
case SDEV_OFFLINE:
case SDEV_TRANSPORT_OFFLINE:
- case SDEV_BLOCK:
break;
default:
goto illegal;
@@ -2628,6 +2644,7 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
case SDEV_OFFLINE:
case SDEV_TRANSPORT_OFFLINE:
case SDEV_CANCEL:
+ case SDEV_BLOCK:
case SDEV_CREATED_BLOCK:
break;
default:
@@ -2871,7 +2888,12 @@ static void scsi_wait_for_queuecommand(struct scsi_device *sdev)
int
scsi_device_quiesce(struct scsi_device *sdev)
{
- int err = scsi_device_set_state(sdev, SDEV_QUIESCE);
+ int err;
+
+ mutex_lock(&sdev->state_mutex);
+ err = scsi_device_set_state(sdev, SDEV_QUIESCE);
+ mutex_unlock(&sdev->state_mutex);
+
if (err)
return err;
@@ -2899,10 +2921,11 @@ void scsi_device_resume(struct scsi_device *sdev)
* so assume the state is being managed elsewhere (for example
* device deleted during suspend)
*/
- if (sdev->sdev_state != SDEV_QUIESCE ||
- scsi_device_set_state(sdev, SDEV_RUNNING))
- return;
- scsi_run_queue(sdev->request_queue);
+ mutex_lock(&sdev->state_mutex);
+ if (sdev->sdev_state == SDEV_QUIESCE &&
+ scsi_device_set_state(sdev, SDEV_RUNNING) == 0)
+ scsi_run_queue(sdev->request_queue);
+ mutex_unlock(&sdev->state_mutex);
}
EXPORT_SYMBOL(scsi_device_resume);
@@ -2933,28 +2956,20 @@ scsi_target_resume(struct scsi_target *starget)
EXPORT_SYMBOL(scsi_target_resume);
/**
- * scsi_internal_device_block - internal function to put a device temporarily into the SDEV_BLOCK state
- * @sdev: device to block
- * @wait: Whether or not to wait until ongoing .queuecommand() /
- * .queue_rq() calls have finished.
- *
- * Block request made by scsi lld's to temporarily stop all
- * scsi commands on the specified device. May sleep.
+ * scsi_internal_device_block_nowait - try to transition to the SDEV_BLOCK state
+ * @sdev: device to block
*
- * Returns zero if successful or error if not
+ * Pause SCSI command processing on the specified device. Does not sleep.
*
- * Notes:
- * This routine transitions the device to the SDEV_BLOCK state
- * (which must be a legal transition). When the device is in this
- * state, all commands are deferred until the scsi lld reenables
- * the device with scsi_device_unblock or device_block_tmo fires.
+ * Returns zero if successful or a negative error code upon failure.
*
- * To do: avoid that scsi_send_eh_cmnd() calls queuecommand() after
- * scsi_internal_device_block() has blocked a SCSI device and also
- * remove the rport mutex lock and unlock calls from srp_queuecommand().
+ * Notes:
+ * This routine transitions the device to the SDEV_BLOCK state (which must be
+ * a legal transition). When the device is in this state, command processing
+ * is paused until the device leaves the SDEV_BLOCK state. See also
+ * scsi_internal_device_unblock_nowait().
*/
-int
-scsi_internal_device_block(struct scsi_device *sdev, bool wait)
+int scsi_internal_device_block_nowait(struct scsi_device *sdev)
{
struct request_queue *q = sdev->request_queue;
unsigned long flags;
@@ -2974,45 +2989,86 @@ scsi_internal_device_block(struct scsi_device *sdev, bool wait)
* request queue.
*/
if (q->mq_ops) {
- if (wait)
- blk_mq_quiesce_queue(q);
- else
- blk_mq_quiesce_queue_nowait(q);
+ blk_mq_quiesce_queue_nowait(q);
} else {
spin_lock_irqsave(q->queue_lock, flags);
blk_stop_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
- if (wait)
- scsi_wait_for_queuecommand(sdev);
}
return 0;
}
-EXPORT_SYMBOL_GPL(scsi_internal_device_block);
-
+EXPORT_SYMBOL_GPL(scsi_internal_device_block_nowait);
+
/**
- * scsi_internal_device_unblock - resume a device after a block request
- * @sdev: device to resume
- * @new_state: state to set devices to after unblocking
+ * scsi_internal_device_block - try to transition to the SDEV_BLOCK state
+ * @sdev: device to block
+ *
+ * Pause SCSI command processing on the specified device and wait until all
+ * ongoing scsi_request_fn() / scsi_queue_rq() calls have finished. May sleep.
*
- * Called by scsi lld's or the midlayer to restart the device queue
- * for the previously suspended scsi device. Called from interrupt or
- * normal process context.
+ * Returns zero if successful or a negative error code upon failure.
*
- * Returns zero if successful or error if not.
+ * Note:
+ * This routine transitions the device to the SDEV_BLOCK state (which must be
+ * a legal transition). When the device is in this state, command processing
+ * is paused until the device leaves the SDEV_BLOCK state. See also
+ * scsi_internal_device_unblock().
*
- * Notes:
- * This routine transitions the device to the SDEV_RUNNING state
- * or to one of the offline states (which must be a legal transition)
- * allowing the midlayer to goose the queue for this device.
+ * To do: avoid that scsi_send_eh_cmnd() calls queuecommand() after
+ * scsi_internal_device_block() has blocked a SCSI device and also
+ * remove the rport mutex lock and unlock calls from srp_queuecommand().
*/
-int
-scsi_internal_device_unblock(struct scsi_device *sdev,
- enum scsi_device_state new_state)
+static int scsi_internal_device_block(struct scsi_device *sdev)
{
- struct request_queue *q = sdev->request_queue;
+ struct request_queue *q = sdev->request_queue;
+ int err;
+
+ mutex_lock(&sdev->state_mutex);
+ err = scsi_internal_device_block_nowait(sdev);
+ if (err == 0) {
+ if (q->mq_ops)
+ blk_mq_quiesce_queue(q);
+ else
+ scsi_wait_for_queuecommand(sdev);
+ }
+ mutex_unlock(&sdev->state_mutex);
+
+ return err;
+}
+
+void scsi_start_queue(struct scsi_device *sdev)
+{
+ struct request_queue *q = sdev->request_queue;
unsigned long flags;
+ if (q->mq_ops) {
+ blk_mq_unquiesce_queue(q);
+ } else {
+ spin_lock_irqsave(q->queue_lock, flags);
+ blk_start_queue(q);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+ }
+}
+
+/**
+ * scsi_internal_device_unblock_nowait - resume a device after a block request
+ * @sdev: device to resume
+ * @new_state: state to set the device to after unblocking
+ *
+ * Restart the device queue for a previously suspended SCSI device. Does not
+ * sleep.
+ *
+ * Returns zero if successful or a negative error code upon failure.
+ *
+ * Notes:
+ * This routine transitions the device to the SDEV_RUNNING state or to one of
+ * the offline states (which must be a legal transition) allowing the midlayer
+ * to goose the queue for this device.
+ */
+int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
+ enum scsi_device_state new_state)
+{
/*
* Try to transition the scsi device to SDEV_RUNNING or one of the
* offlined states and goose the device queue if successful.
@@ -3030,22 +3086,42 @@ scsi_internal_device_unblock(struct scsi_device *sdev,
sdev->sdev_state != SDEV_OFFLINE)
return -EINVAL;
- if (q->mq_ops) {
- blk_mq_unquiesce_queue(q);
- } else {
- spin_lock_irqsave(q->queue_lock, flags);
- blk_start_queue(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
- }
+ scsi_start_queue(sdev);
return 0;
}
-EXPORT_SYMBOL_GPL(scsi_internal_device_unblock);
+EXPORT_SYMBOL_GPL(scsi_internal_device_unblock_nowait);
+
+/**
+ * scsi_internal_device_unblock - resume a device after a block request
+ * @sdev: device to resume
+ * @new_state: state to set the device to after unblocking
+ *
+ * Restart the device queue for a previously suspended SCSI device. May sleep.
+ *
+ * Returns zero if successful or a negative error code upon failure.
+ *
+ * Notes:
+ * This routine transitions the device to the SDEV_RUNNING state or to one of
+ * the offline states (which must be a legal transition) allowing the midlayer
+ * to goose the queue for this device.
+ */
+static int scsi_internal_device_unblock(struct scsi_device *sdev,
+ enum scsi_device_state new_state)
+{
+ int ret;
+
+ mutex_lock(&sdev->state_mutex);
+ ret = scsi_internal_device_unblock_nowait(sdev, new_state);
+ mutex_unlock(&sdev->state_mutex);
+
+ return ret;
+}
static void
device_block(struct scsi_device *sdev, void *data)
{
- scsi_internal_device_block(sdev, true);
+ scsi_internal_device_block(sdev);
}
static int

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