Dear Dan,
You seems forget change sas_alloc_task to sas_alloc_slow_task in pm8001.
I'll post a patch to fix this later.
Thanks for your work.
Jack
[PATCH v8 13/13] 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@xxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
> drivers/scsi/libsas/sas_expander.c | 20 ++++++++++----------
> drivers/scsi/libsas/sas_init.c | 23 +++++++++++++++++++++--
> drivers/scsi/libsas/sas_scsi_host.c | 8 ++++++--
> drivers/scsi/mvsas/mv_sas.c | 20 ++++++++++----------
> drivers/scsi/pm8001/pm8001_sas.c | 30 +++++++++++++++---------------
> include/scsi/libsas.h | 14 +++++++++-----
> 6 files changed, 71 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/scsi/libsas/sas_expander.c
> b/drivers/scsi/libsas/sas_expander.c
> index 05acd9e..0ab3796 100644
> --- 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 2fc23d3..57e7ac9 100644
> --- 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 86ffd8f..9716f2e 100644
> --- a/drivers/scsi/libsas/sas_scsi_host.c
> +++ b/drivers/scsi/libsas/sas_scsi_host.c
> @@ -1013,9 +1013,13 @@ 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 b68a653..d0462b8 100644
> --- 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 b111018..ad36f1a 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.c
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -627,9 +627,9 @@ 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)
> @@ -637,7 +637,7 @@ 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
> @@ -668,21 +668,21 @@ 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)) {
> @@ -749,10 +749,10 @@ pm8001_exec_internal_task_abort(struct
pm8001_hba_info
> *pm8001_ha,
> 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)
> @@ -766,13 +766,13 @@ 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 484bc52..4e84ef3 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -568,10 +568,6 @@ 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;
> @@ -588,8 +584,15 @@ 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
> @@ -599,6 +602,7 @@ 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 {
>
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