[SCSI] libsas: trim sas_task of slow path infrastructure
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>
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 879dbbe..efc6e72 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -51,14 +51,14 @@
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 @@
break;
}
- task = sas_alloc_task(GFP_KERNEL);
+ task = sas_alloc_slow_task(GFP_KERNEL);
if (!task) {
res = -ENOMEM;
break;
@@ -91,20 +91,20 @@
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");
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 1bbab3d..014297c 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -48,18 +48,37 @@
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);
}
}
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 6764148..6e795a1 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -1134,9 +1134,13 @@
/* 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;
}
diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index fd3b283..7d46c1a 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -1365,9 +1365,9 @@
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 @@
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 @@
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 @@
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)) {
diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index fdbba57..b961112 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -650,9 +650,9 @@
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 @@
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 @@
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 @@
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 @@
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_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)) {
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 29a8cc7..ae33706 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -613,10 +613,6 @@
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 @@
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 @@
#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 {