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[SCSI] libsas: trim sas_task of slow path infrastructure

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The timer and the completion are only used for slow path tasks (smp, and
lldd tmfs), yet we incur the allocation space and cpu setup time for
every fast path task.

Cc: Xiangliang Yu <yuxiangl@marvell.com>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams 2012-06-21 23:36:30 -07:00 committed by James Bottomley
parent a494fd5bd9
commit f0bf750c2d
6 changed files with 73 additions and 46 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/scsi/libsas/sas_expander.c
View file

@ -51,14 +51,14 @@ static void smp_task_timedout(unsigned long _task)
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
complete(&task->completion);
complete(&task->slow_task->completion);
}
static void smp_task_done(struct sas_task *task)
{
if (!del_timer(&task->timer))
if (!del_timer(&task->slow_task->timer))
return;
complete(&task->completion);
complete(&task->slow_task->completion);
}
/* Give it some long enough timeout. In seconds. */
@ -79,7 +79,7 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
break;
}
task = sas_alloc_task(GFP_KERNEL);
task = sas_alloc_slow_task(GFP_KERNEL);
if (!task) {
res = -ENOMEM;
break;
@ -91,20 +91,20 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
task->task_done = smp_task_done;
task->timer.data = (unsigned long) task;
task->timer.function = smp_task_timedout;
task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
add_timer(&task->timer);
task->slow_task->timer.data = (unsigned long) task;
task->slow_task->timer.function = smp_task_timedout;
task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
add_timer(&task->slow_task->timer);
res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
if (res) {
del_timer(&task->timer);
del_timer(&task->slow_task->timer);
SAS_DPRINTK("executing SMP task failed:%d\n", res);
break;
}
wait_for_completion(&task->completion);
wait_for_completion(&task->slow_task->completion);
res = -ECOMM;
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
SAS_DPRINTK("smp task timed out or aborted\n");

23
drivers/scsi/libsas/sas_init.c
View file

@ -48,18 +48,37 @@ struct sas_task *sas_alloc_task(gfp_t flags)
INIT_LIST_HEAD(&task->list);
spin_lock_init(&task->task_state_lock);
task->task_state_flags = SAS_TASK_STATE_PENDING;
init_timer(&task->timer);
init_completion(&task->completion);
}
return task;
}
EXPORT_SYMBOL_GPL(sas_alloc_task);
struct sas_task *sas_alloc_slow_task(gfp_t flags)
{
struct sas_task *task = sas_alloc_task(flags);
struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
if (!task || !slow) {
if (task)
kmem_cache_free(sas_task_cache, task);
kfree(slow);
return NULL;
}
task->slow_task = slow;
init_timer(&slow->timer);
init_completion(&slow->completion);
return task;
}
EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
void sas_free_task(struct sas_task *task)
{
if (task) {
BUG_ON(!list_empty(&task->list));
kfree(task->slow_task);
kmem_cache_free(sas_task_cache, task);
}
}

8
drivers/scsi/libsas/sas_scsi_host.c
View file

@ -1134,9 +1134,13 @@ void sas_task_abort(struct sas_task *task)
/* Escape for libsas internal commands */
if (!sc) {
if (!del_timer(&task->timer))
struct sas_task_slow *slow = task->slow_task;
if (!slow)
return;
task->timer.function(task->timer.data);
if (!del_timer(&slow->timer))
return;
slow->timer.function(slow->timer.data);
return;
}

20
drivers/scsi/mvsas/mv_sas.c
View file

@ -1365,9 +1365,9 @@ void mvs_dev_gone(struct domain_device *dev)
static void mvs_task_done(struct sas_task *task)
{
if (!del_timer(&task->timer))
if (!del_timer(&task->slow_task->timer))
return;
complete(&task->completion);
complete(&task->slow_task->completion);
}
static void mvs_tmf_timedout(unsigned long data)
@ -1375,7 +1375,7 @@ static void mvs_tmf_timedout(unsigned long data)
struct sas_task *task = (struct sas_task *)data;
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
complete(&task->completion);
complete(&task->slow_task->completion);
}
#define MVS_TASK_TIMEOUT 20
@ -1386,7 +1386,7 @@ static int mvs_exec_internal_tmf_task(struct domain_device *dev,
struct sas_task *task = NULL;
for (retry = 0; retry < 3; retry++) {
task = sas_alloc_task(GFP_KERNEL);
task = sas_alloc_slow_task(GFP_KERNEL);
if (!task)
return -ENOMEM;
@ -1396,20 +1396,20 @@ static int mvs_exec_internal_tmf_task(struct domain_device *dev,
memcpy(&task->ssp_task, parameter, para_len);
task->task_done = mvs_task_done;
task->timer.data = (unsigned long) task;
task->timer.function = mvs_tmf_timedout;
task->timer.expires = jiffies + MVS_TASK_TIMEOUT*HZ;
add_timer(&task->timer);
task->slow_task->timer.data = (unsigned long) task;
task->slow_task->timer.function = mvs_tmf_timedout;
task->slow_task->timer.expires = jiffies + MVS_TASK_TIMEOUT*HZ;
add_timer(&task->slow_task->timer);
res = mvs_task_exec(task, 1, GFP_KERNEL, NULL, 1, tmf);
if (res) {
del_timer(&task->timer);
del_timer(&task->slow_task->timer);
mv_printk("executing internel task failed:%d\n", res);
goto ex_err;
}
wait_for_completion(&task->completion);
wait_for_completion(&task->slow_task->completion);
res = TMF_RESP_FUNC_FAILED;
/* Even TMF timed out, return direct. */
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {

34
drivers/scsi/pm8001/pm8001_sas.c
View file

@ -650,9 +650,9 @@ int pm8001_dev_found(struct domain_device *dev)
static void pm8001_task_done(struct sas_task *task)
{
if (!del_timer(&task->timer))
if (!del_timer(&task->slow_task->timer))
return;
complete(&task->completion);
complete(&task->slow_task->completion);
}
static void pm8001_tmf_timedout(unsigned long data)
@ -660,7 +660,7 @@ static void pm8001_tmf_timedout(unsigned long data)
struct sas_task *task = (struct sas_task *)data;
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
complete(&task->completion);
complete(&task->slow_task->completion);
}
#define PM8001_TASK_TIMEOUT 20
@ -683,7 +683,7 @@ static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
struct pm8001_hba_info *pm8001_ha = pm8001_find_ha_by_dev(dev);
for (retry = 0; retry < 3; retry++) {
task = sas_alloc_task(GFP_KERNEL);
task = sas_alloc_slow_task(GFP_KERNEL);
if (!task)
return -ENOMEM;
@ -691,21 +691,21 @@ static int pm8001_exec_internal_tmf_task(struct domain_device *dev,
task->task_proto = dev->tproto;
memcpy(&task->ssp_task, parameter, para_len);
task->task_done = pm8001_task_done;
task->timer.data = (unsigned long)task;
task->timer.function = pm8001_tmf_timedout;
task->timer.expires = jiffies + PM8001_TASK_TIMEOUT*HZ;
add_timer(&task->timer);
task->slow_task->timer.data = (unsigned long)task;
task->slow_task->timer.function = pm8001_tmf_timedout;
task->slow_task->timer.expires = jiffies + PM8001_TASK_TIMEOUT*HZ;
add_timer(&task->slow_task->timer);
res = pm8001_task_exec(task, 1, GFP_KERNEL, 1, tmf);
if (res) {
del_timer(&task->timer);
del_timer(&task->slow_task->timer);
PM8001_FAIL_DBG(pm8001_ha,
pm8001_printk("Executing internal task "
"failed\n"));
goto ex_err;
}
wait_for_completion(&task->completion);
wait_for_completion(&task->slow_task->completion);
res = -TMF_RESP_FUNC_FAILED;
/* Even TMF timed out, return direct. */
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
@ -765,17 +765,17 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
struct sas_task *task = NULL;
for (retry = 0; retry < 3; retry++) {
task = sas_alloc_task(GFP_KERNEL);
task = sas_alloc_slow_task(GFP_KERNEL);
if (!task)
return -ENOMEM;
task->dev = dev;
task->task_proto = dev->tproto;
task->task_done = pm8001_task_done;
task->timer.data = (unsigned long)task;
task->timer.function = pm8001_tmf_timedout;
task->timer.expires = jiffies + PM8001_TASK_TIMEOUT * HZ;
add_timer(&task->timer);
task->slow_task->timer.data = (unsigned long)task;
task->slow_task->timer.function = pm8001_tmf_timedout;
task->slow_task->timer.expires = jiffies + PM8001_TASK_TIMEOUT * HZ;
add_timer(&task->slow_task->timer);
res = pm8001_tag_alloc(pm8001_ha, &ccb_tag);
if (res)
@ -789,13 +789,13 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
pm8001_dev, flag, task_tag, ccb_tag);
if (res) {
del_timer(&task->timer);
del_timer(&task->slow_task->timer);
PM8001_FAIL_DBG(pm8001_ha,
pm8001_printk("Executing internal task "
"failed\n"));
goto ex_err;
}
wait_for_completion(&task->completion);
wait_for_completion(&task->slow_task->completion);
res = TMF_RESP_FUNC_FAILED;
/* Even TMF timed out, return direct. */
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {

14
include/scsi/libsas.h
View file

@ -613,10 +613,6 @@ struct sas_task {
enum sas_protocol task_proto;
/* Used by the discovery code. */
struct timer_list timer;
struct completion completion;
union {
struct sas_ata_task ata_task;
struct sas_smp_task smp_task;
@ -633,8 +629,15 @@ struct sas_task {
void *lldd_task; /* for use by LLDDs */
void *uldd_task;
struct sas_task_slow *slow_task;
};
struct work_struct abort_work;
struct sas_task_slow {
/* standard/extra infrastructure for slow path commands (SMP and
* internal lldd commands
*/
struct timer_list timer;
struct completion completion;
};
#define SAS_TASK_STATE_PENDING 1
@ -644,6 +647,7 @@ struct sas_task {
#define SAS_TASK_AT_INITIATOR 16
extern struct sas_task *sas_alloc_task(gfp_t flags);
extern struct sas_task *sas_alloc_slow_task(gfp_t flags);
extern void sas_free_task(struct sas_task *task);
struct sas_domain_function_template {