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>

1 files changed, 5 insertions, 21 deletions

diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index f440e421ea0e..7628decbd535 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -257,6 +257,7 @@ struct isci_request {
         #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 @@ isci_request_change_started_to_aborted(struct isci_request *isci_request,
                                                        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