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>
diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index c99fab5..0884ae3 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -255,14 +255,14 @@
static void scic_sds_controller_task_completion(struct scic_sds_controller *scic,
u32 completion_entry)
{
- u32 index;
- struct scic_sds_request *sci_req;
-
- index = SCU_GET_COMPLETION_INDEX(completion_entry);
- sci_req = scic->io_request_table[index];
+ u32 index = SCU_GET_COMPLETION_INDEX(completion_entry);
+ struct isci_host *ihost = scic_to_ihost(scic);
+ struct isci_request *ireq = ihost->reqs[index];
+ struct scic_sds_request *sci_req = &ireq->sci;
/* Make sure that we really want to process this IO request */
- if (sci_req && sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG &&
+ if (test_bit(IREQ_ACTIVE, &ireq->flags) &&
+ sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG &&
ISCI_TAG_SEQ(sci_req->io_tag) == scic->io_request_sequence[index])
/* Yep this is a valid io request pass it along to the io request handler */
scic_sds_io_request_tc_completion(sci_req, completion_entry);
@@ -280,7 +280,7 @@
switch (scu_get_command_request_type(completion_entry)) {
case SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC:
case SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_TC:
- io_request = scic->io_request_table[index];
+ io_request = &scic_to_ihost(scic)->reqs[index]->sci;
dev_warn(scic_to_dev(scic),
"%s: SCIC SDS Completion type SDMA %x for io request "
"%p\n",
@@ -418,7 +418,7 @@
break;
case SCU_EVENT_TYPE_TRANSPORT_ERROR:
- io_request = scic->io_request_table[index];
+ io_request = &ihost->reqs[index]->sci;
scic_sds_io_request_event_handler(io_request, completion_entry);
break;
@@ -426,7 +426,7 @@
switch (scu_get_event_specifier(completion_entry)) {
case SCU_EVENT_SPECIFIC_SMP_RESPONSE_NO_PE:
case SCU_EVENT_SPECIFIC_TASK_TIMEOUT:
- io_request = scic->io_request_table[index];
+ io_request = &ihost->reqs[index]->sci;
if (io_request != NULL)
scic_sds_io_request_event_handler(io_request, completion_entry);
else
@@ -1187,9 +1187,6 @@
spin_lock_irq(&isci_host->scic_lock);
isci_free_tag(isci_host, request->sci.io_tag);
spin_unlock_irq(&isci_host->scic_lock);
-
- /* Free the request object. */
- isci_request_free(isci_host, request);
}
list_for_each_entry_safe(request, next_request, &errored_request_list,
completed_node) {
@@ -1227,9 +1224,6 @@
list_del_init(&request->dev_node);
isci_free_tag(isci_host, request->sci.io_tag);
spin_unlock_irq(&isci_host->scic_lock);
-
- /* Free the request object. */
- isci_request_free(isci_host, request);
}
}
@@ -2469,13 +2463,6 @@
if (err)
return err;
- isci_host->dma_pool = dmam_pool_create(DRV_NAME, &isci_host->pdev->dev,
- sizeof(struct isci_request),
- SLAB_HWCACHE_ALIGN, 0);
-
- if (!isci_host->dma_pool)
- return -ENOMEM;
-
for (i = 0; i < SCI_MAX_PORTS; i++)
isci_port_init(&isci_host->ports[i], isci_host, i);
@@ -2489,6 +2476,25 @@
INIT_LIST_HEAD(&idev->node);
}
+ for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) {
+ struct isci_request *ireq;
+ dma_addr_t dma;
+
+ ireq = dmam_alloc_coherent(&isci_host->pdev->dev,
+ sizeof(struct isci_request), &dma,
+ GFP_KERNEL);
+ if (!ireq)
+ return -ENOMEM;
+
+ ireq->sci.tc = &isci_host->sci.task_context_table[i];
+ ireq->sci.owning_controller = &isci_host->sci;
+ spin_lock_init(&ireq->state_lock);
+ ireq->request_daddr = dma;
+ ireq->isci_host = isci_host;
+
+ isci_host->reqs[i] = ireq;
+ }
+
return 0;
}
@@ -2602,12 +2608,13 @@
task_index = ISCI_TAG_TCI(io_tag);
if (task_index < scic->task_context_entries) {
- if (scic->io_request_table[task_index] != NULL) {
+ struct isci_request *ireq = scic_to_ihost(scic)->reqs[task_index];
+
+ if (test_bit(IREQ_ACTIVE, &ireq->flags)) {
task_sequence = ISCI_TAG_SEQ(io_tag);
- if (task_sequence == scic->io_request_sequence[task_index]) {
- return scic->io_request_table[task_index];
- }
+ if (task_sequence == scic->io_request_sequence[task_index])
+ return &ireq->sci;
}
}
@@ -2820,7 +2827,7 @@
if (status != SCI_SUCCESS)
return status;
- scic->io_request_table[ISCI_TAG_TCI(req->io_tag)] = req;
+ set_bit(IREQ_ACTIVE, &sci_req_to_ireq(req)->flags);
scic_sds_controller_post_request(scic, scic_sds_request_get_post_context(req));
return SCI_SUCCESS;
}
@@ -2897,7 +2904,7 @@
return status;
index = ISCI_TAG_TCI(request->io_tag);
- scic->io_request_table[index] = NULL;
+ clear_bit(IREQ_ACTIVE, &sci_req_to_ireq(request)->flags);
return SCI_SUCCESS;
default:
dev_warn(scic_to_dev(scic), "invalid state to complete I/O");
@@ -2915,7 +2922,7 @@
return SCI_FAILURE_INVALID_STATE;
}
- scic->io_request_table[ISCI_TAG_TCI(sci_req->io_tag)] = sci_req;
+ set_bit(IREQ_ACTIVE, &sci_req_to_ireq(sci_req)->flags);
scic_sds_controller_post_request(scic, scic_sds_request_get_post_context(sci_req));
return SCI_SUCCESS;
}
@@ -2934,6 +2941,7 @@
struct scic_sds_remote_device *rdev,
struct scic_sds_request *req)
{
+ struct isci_request *ireq = sci_req_to_ireq(req);
enum sci_status status;
if (scic->sm.current_state_id != SCIC_READY) {
@@ -2947,7 +2955,7 @@
status = scic_sds_remote_device_start_task(scic, rdev, req);
switch (status) {
case SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS:
- scic->io_request_table[ISCI_TAG_TCI(req->io_tag)] = req;
+ set_bit(IREQ_ACTIVE, &ireq->flags);
/*
* We will let framework know this task request started successfully,
@@ -2956,7 +2964,7 @@
*/
return SCI_SUCCESS;
case SCI_SUCCESS:
- scic->io_request_table[ISCI_TAG_TCI(req->io_tag)] = req;
+ set_bit(IREQ_ACTIVE, &ireq->flags);
scic_sds_controller_post_request(scic,
scic_sds_request_get_post_context(req));
diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index d8164f5..446fade 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -166,14 +166,6 @@
struct scic_sds_remote_device *device_table[SCI_MAX_REMOTE_DEVICES];
/**
- * This field is the array of IO request objects that are currently active for
- * this controller object. This table is used as a fast lookup of the io
- * request object that need to handle completion queue notifications. The
- * table is TCi based.
- */
- struct scic_sds_request *io_request_table[SCI_MAX_IO_REQUESTS];
-
- /**
* This field is the free RNi data structure
*/
struct scic_remote_node_table available_remote_nodes;
@@ -298,7 +290,6 @@
union scic_oem_parameters oem_parameters;
int id; /* unique within a given pci device */
- struct dma_pool *dma_pool;
struct isci_phy phys[SCI_MAX_PHYS];
struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
struct sas_ha_struct sas_ha;
@@ -315,7 +306,7 @@
struct list_head requests_to_complete;
struct list_head requests_to_errorback;
spinlock_t scic_lock;
-
+ struct isci_request *reqs[SCI_MAX_IO_REQUESTS];
struct isci_remote_device devices[SCI_MAX_REMOTE_DEVICES];
};
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index c5ce0f0..5a86bb1 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -136,16 +136,19 @@
static enum sci_status scic_sds_remote_device_terminate_requests(struct scic_sds_remote_device *sci_dev)
{
struct scic_sds_controller *scic = sci_dev->owning_port->owning_controller;
+ struct isci_host *ihost = scic_to_ihost(scic);
u32 i, request_count = sci_dev->started_request_count;
enum sci_status status = SCI_SUCCESS;
for (i = 0; i < SCI_MAX_IO_REQUESTS && i < request_count; i++) {
- struct scic_sds_request *sci_req;
+ struct isci_request *ireq = ihost->reqs[i];
+ struct scic_sds_request *sci_req = &ireq->sci;
enum sci_status s;
- sci_req = scic->io_request_table[i];
- if (!sci_req || sci_req->target_device != sci_dev)
+ if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
+ sci_req->target_device != sci_dev)
continue;
+
s = scic_controller_terminate_request(scic, sci_dev, sci_req);
if (s != SCI_SUCCESS)
status = s;
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 27376ba..3c7ed4e 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -3017,13 +3017,10 @@
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 @@
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 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_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 @@
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 @@
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 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 @@
"%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 @@
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;
}
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index f440e42..7628dec 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -257,6 +257,7 @@
#define IREQ_COMPLETE_IN_TARGET 0
#define IREQ_TERMINATED 1
#define IREQ_TMF 2
+ #define IREQ_ACTIVE 3
unsigned long flags;
union ttype_ptr_union {
@@ -590,33 +591,16 @@
completion_ptr,
aborted);
}
-/**
- * isci_request_free() - This function frees the request object.
- * @isci_host: This parameter specifies the ISCI host object
- * @isci_request: This parameter points to the isci_request object
- *
- */
-static inline void isci_request_free(struct isci_host *isci_host,
- struct isci_request *isci_request)
-{
- if (!isci_request)
- return;
-
- /* release the dma memory if we fail. */
- dma_pool_free(isci_host->dma_pool,
- isci_request,
- isci_request->request_daddr);
-}
#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
-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);
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);
void isci_terminate_pending_requests(struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
index d1a4671..d2dba83 100644
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -203,7 +203,7 @@
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* build and send the request. */
- status = isci_request_execute(ihost, idev, task, tag, gfp_flags);
+ status = isci_request_execute(ihost, idev, task, tag);
if (status != SCI_SUCCESS) {
@@ -252,7 +252,7 @@
dev = idev->domain_dev;
/* do common allocation and init of request object. */
- ireq = isci_request_alloc_tmf(ihost, isci_tmf, GFP_ATOMIC);
+ ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
if (!ireq)
return NULL;
@@ -266,7 +266,7 @@
"status = 0x%x\n",
__func__,
status);
- goto errout;
+ return NULL;
}
/* XXX convert to get this from task->tproto like other drivers */
@@ -274,7 +274,7 @@
isci_tmf->proto = SAS_PROTOCOL_SSP;
status = scic_task_request_construct_ssp(&ireq->sci);
if (status != SCI_SUCCESS)
- goto errout;
+ return NULL;
}
if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
@@ -282,12 +282,9 @@
status = isci_sata_management_task_request_build(ireq);
if (status != SCI_SUCCESS)
- goto errout;
+ return NULL;
}
return ireq;
- errout:
- isci_request_free(ihost, ireq);
- return NULL;
}
int isci_task_execute_tmf(struct isci_host *ihost,
@@ -349,7 +346,7 @@
status,
ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
- goto err_ireq;
+ goto err_tci;
}
if (tmf->cb_state_func != NULL)
@@ -401,8 +398,6 @@
return ret;
- err_ireq:
- isci_request_free(ihost, ireq);
err_tci:
spin_lock_irqsave(&ihost->scic_lock, flags);
isci_tci_free(ihost, ISCI_TAG_TCI(tag));
@@ -516,8 +511,6 @@
spin_lock_irqsave(&isci_host->scic_lock, flags);
list_del_init(&isci_request->dev_node);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
-
- isci_request_free(isci_host, isci_request);
}
}