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authorDan Williams <dan.j.williams@intel.com>2011-06-17 14:18:39 -0700
committerDan Williams <dan.j.williams@intel.com>2011-07-03 04:04:51 -0700
commitdb0562509800a2d4cb5cb14a66413c30484f165c (patch)
treed05cc34b78a8f2a6b9024b8d45e5e8e50786ee64 /drivers/scsi/isci/request.c
parent38d8879baeb61b6946052739e7c03fa79b3a57f0 (diff)
isci: preallocate requests
the dma_pool interface is optimized for object_size << page_size which is not the case with isci_request objects and the dma_pool routines show up in the top of the profile. The old io_request_table which tracked whether tci slots were in-flight or not is replaced with an IREQ_ACTIVE flag per request. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/scsi/isci/request.c')
-rw-r--r--drivers/scsi/isci/request.c89
1 files changed, 28 insertions, 61 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 27376ba22483..3c7ed4e61b4a 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -3017,13 +3017,10 @@ static const struct sci_base_state scic_sds_request_state_table[] = {
static void
scic_sds_general_request_construct(struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev,
- u16 io_tag,
struct scic_sds_request *sci_req)
{
sci_init_sm(&sci_req->sm, scic_sds_request_state_table, SCI_REQ_INIT);
- sci_req->io_tag = io_tag;
- sci_req->owning_controller = scic;
sci_req->target_device = sci_dev;
sci_req->protocol = SCIC_NO_PROTOCOL;
sci_req->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
@@ -3031,20 +3028,18 @@ scic_sds_general_request_construct(struct scic_sds_controller *scic,
sci_req->sci_status = SCI_SUCCESS;
sci_req->scu_status = 0;
sci_req->post_context = 0xFFFFFFFF;
- sci_req->tc = &scic->task_context_table[ISCI_TAG_TCI(io_tag)];
- WARN_ONCE(io_tag == SCI_CONTROLLER_INVALID_IO_TAG, "straggling invalid tag usage\n");
}
static enum sci_status
scic_io_request_construct(struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev,
- u16 io_tag, struct scic_sds_request *sci_req)
+ struct scic_sds_request *sci_req)
{
struct domain_device *dev = sci_dev_to_domain(sci_dev);
enum sci_status status = SCI_SUCCESS;
/* Build the common part of the request */
- scic_sds_general_request_construct(scic, sci_dev, io_tag, sci_req);
+ scic_sds_general_request_construct(scic, sci_dev, sci_req);
if (sci_dev->rnc.remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
return SCI_FAILURE_INVALID_REMOTE_DEVICE;
@@ -3071,7 +3066,7 @@ enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
enum sci_status status = SCI_SUCCESS;
/* Build the common part of the request */
- scic_sds_general_request_construct(scic, sci_dev, io_tag, sci_req);
+ scic_sds_general_request_construct(scic, sci_dev, sci_req);
if (dev->dev_type == SAS_END_DEV ||
dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
@@ -3291,8 +3286,7 @@ static enum sci_status isci_smp_request_build(struct isci_request *ireq)
*/
static enum sci_status isci_io_request_build(struct isci_host *isci_host,
struct isci_request *request,
- struct isci_remote_device *isci_device,
- u16 tag)
+ struct isci_remote_device *isci_device)
{
enum sci_status status = SCI_SUCCESS;
struct sas_task *task = isci_request_access_task(request);
@@ -3325,11 +3319,8 @@ static enum sci_status isci_io_request_build(struct isci_host *isci_host,
return SCI_FAILURE_INSUFFICIENT_RESOURCES;
}
- /* build the common request object. For now,
- * we will let the core allocate the IO tag.
- */
status = scic_io_request_construct(&isci_host->sci, sci_device,
- tag, &request->sci);
+ &request->sci);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
@@ -3359,65 +3350,51 @@ static enum sci_status isci_io_request_build(struct isci_host *isci_host,
return SCI_SUCCESS;
}
-static struct isci_request *isci_request_alloc_core(struct isci_host *ihost,
- gfp_t gfp_flags)
+static struct isci_request *isci_request_from_tag(struct isci_host *ihost, u16 tag)
{
- dma_addr_t handle;
struct isci_request *ireq;
- ireq = dma_pool_alloc(ihost->dma_pool, gfp_flags, &handle);
- if (!ireq) {
- dev_warn(&ihost->pdev->dev,
- "%s: dma_pool_alloc returned NULL\n", __func__);
- return NULL;
- }
-
- /* initialize the request object. */
- spin_lock_init(&ireq->state_lock);
- ireq->request_daddr = handle;
- ireq->isci_host = ihost;
+ ireq = ihost->reqs[ISCI_TAG_TCI(tag)];
+ ireq->sci.io_tag = tag;
ireq->io_request_completion = NULL;
ireq->flags = 0;
ireq->num_sg_entries = 0;
INIT_LIST_HEAD(&ireq->completed_node);
INIT_LIST_HEAD(&ireq->dev_node);
-
isci_request_change_state(ireq, allocated);
return ireq;
}
-static struct isci_request *isci_request_alloc_io(struct isci_host *ihost,
- struct sas_task *task,
- gfp_t gfp_flags)
+static struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
+ struct sas_task *task,
+ u16 tag)
{
struct isci_request *ireq;
- ireq = isci_request_alloc_core(ihost, gfp_flags);
- if (ireq) {
- ireq->ttype_ptr.io_task_ptr = task;
- ireq->ttype = io_task;
- task->lldd_task = ireq;
- }
+ ireq = isci_request_from_tag(ihost, tag);
+ ireq->ttype_ptr.io_task_ptr = task;
+ ireq->ttype = io_task;
+ task->lldd_task = ireq;
+
return ireq;
}
-struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
- struct isci_tmf *isci_tmf,
- gfp_t gfp_flags)
+struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
+ struct isci_tmf *isci_tmf,
+ u16 tag)
{
struct isci_request *ireq;
- ireq = isci_request_alloc_core(ihost, gfp_flags);
- if (ireq) {
- ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
- ireq->ttype = tmf_task;
- }
+ ireq = isci_request_from_tag(ihost, tag);
+ ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
+ ireq->ttype = tmf_task;
+
return ireq;
}
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
- struct sas_task *task, u16 tag, gfp_t gfp_flags)
+ struct sas_task *task, u16 tag)
{
enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
struct isci_request *ireq;
@@ -3425,17 +3402,15 @@ int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *ide
int ret = 0;
/* do common allocation and init of request object. */
- ireq = isci_request_alloc_io(ihost, task, gfp_flags);
- if (!ireq)
- goto out;
+ ireq = isci_io_request_from_tag(ihost, task, tag);
- status = isci_io_request_build(ihost, ireq, idev, tag);
+ status = isci_io_request_build(ihost, ireq, idev);
if (status != SCI_SUCCESS) {
dev_warn(&ihost->pdev->dev,
"%s: request_construct failed - status = 0x%x\n",
__func__,
status);
- goto out;
+ return status;
}
spin_lock_irqsave(&ihost->scic_lock, flags);
@@ -3468,7 +3443,7 @@ int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *ide
"%s: failed request start (0x%x)\n",
__func__, status);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
- goto out;
+ return status;
}
/* Either I/O started OK, or the core has signaled that
@@ -3518,13 +3493,5 @@ int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *ide
status = SCI_SUCCESS;
}
- out:
- if (status != SCI_SUCCESS) {
- /* release dma memory on failure. */
- isci_request_free(ihost, ireq);
- ireq = NULL;
- ret = SCI_FAILURE;
- }
-
return ret;
}

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