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: Christoph Hellwig <hch@lst.de>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index caa0525d2523037f7bace6a27cfdb007176b0448..f1e8e0a27ecda13bb57fee2e819cfcd7b04182c6 100644 (file)
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -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");

diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 1bbab3d94a2027144901689731017b13c1b9708a..014297c05880d8e2fdd3e889550f3536b3cab30e 100644 (file)
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -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);
        }
 }

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 676414859872acbbc0e1ae301c4726d52ba50c7d..6e795a174a1241f489e5ae34468589cff5ac6a1d 100644 (file)
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -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;
+               if (!del_timer(&slow->timer))
                        return;
-               task->timer.function(task->timer.data);
+               slow->timer.function(slow->timer.data);
                return;
        }
 

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index b68a65390f0dc7a85603b2ad42ce462f25a276c2..d0462b86c96e8f73bf1600bb8985bc83266533bf 100644 (file)
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -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)) {

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index fdbba57a74aec61a031dcd0d218ba45e10f48505..b961112395d5e053145ba6f83ed4bf7e5058c5c5 100644 (file)
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -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)) {

diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 7c4bd082549164c68e05c0809ec2c73576d57e3d..996ee7c1fb1bdd914923d7429763c958fb7794fe 100644 (file)
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -612,10 +612,6 @@ 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;
@@ -632,8 +628,15 @@ 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
@@ -643,6 +646,7 @@ 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 {