scsi: mpt3sas: Pre-allocate RDPQ Array at driver boot time.

Instead of allocating RDPQ array (This stores the address's of each RDPQ
pools) at run time, now it will be allocated once during driver load
time and same will be reused during host reset operation also (instead
of allocating & freeing this buffer on the fly during every host reset
operation) and then freed during driver unload.
Signed-off-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mpt3sas/mpt3sas_base.c

@@ -4162,7 +4162,14 @@ _base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
 			}
 		} while (ioc->rdpq_array_enable &&
 			   (++i < ioc->reply_queue_count));
-
+		if (ioc->reply_post_free_array &&
+			ioc->rdpq_array_enable) {
+			dma_pool_free(ioc->reply_post_free_array_dma_pool,
+				ioc->reply_post_free_array,
+				ioc->reply_post_free_array_dma);
+			ioc->reply_post_free_array = NULL;
+		}
+		dma_pool_destroy(ioc->reply_post_free_array_dma_pool);
 		dma_pool_destroy(ioc->reply_post_free_dma_pool);
 		kfree(ioc->reply_post);
 	}
@@ -4212,7 +4219,7 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
 	struct mpt3sas_facts *facts;
 	u16 max_sge_elements;
 	u16 chains_needed_per_io;
-	u32 sz, total_sz, reply_post_free_sz;
+	u32 sz, total_sz, reply_post_free_sz, reply_post_free_array_sz;
 	u32 retry_sz;
 	u16 max_request_credit, nvme_blocks_needed;
 	unsigned short sg_tablesize;
@@ -4684,6 +4691,28 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
 		ioc->name, (unsigned long long)ioc->reply_free_dma));
 	total_sz += sz;
 
+	if (ioc->rdpq_array_enable) {
+		reply_post_free_array_sz = ioc->reply_queue_count *
+		    sizeof(Mpi2IOCInitRDPQArrayEntry);
+		ioc->reply_post_free_array_dma_pool =
+		    dma_pool_create("reply_post_free_array pool",
+		    &ioc->pdev->dev, reply_post_free_array_sz, 16, 0);
+		if (!ioc->reply_post_free_array_dma_pool) {
+			dinitprintk(ioc,
+			    pr_info(MPT3SAS_FMT "reply_post_free_array pool: "
+			    "dma_pool_create failed\n", ioc->name));
+			goto out;
+		}
+		ioc->reply_post_free_array =
+		    dma_pool_alloc(ioc->reply_post_free_array_dma_pool,
+		    GFP_KERNEL, &ioc->reply_post_free_array_dma);
+		if (!ioc->reply_post_free_array) {
+			dinitprintk(ioc,
+			    pr_info(MPT3SAS_FMT "reply_post_free_array pool: "
+			    "dma_pool_alloc failed\n", ioc->name));
+			goto out;
+		}
+	}
 	ioc->config_page_sz = 512;
 	ioc->config_page = pci_alloc_consistent(ioc->pdev,
 	    ioc->config_page_sz, &ioc->config_page_dma);
@@ -5490,8 +5519,6 @@ _base_send_ioc_init(struct MPT3SAS_ADAPTER *ioc)
 	ktime_t current_time;
 	u16 ioc_status;
 	u32 reply_post_free_array_sz = 0;
-	Mpi2IOCInitRDPQArrayEntry *reply_post_free_array = NULL;
-	dma_addr_t reply_post_free_array_dma;
 
 	dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
 	    __func__));
@@ -5525,23 +5552,14 @@ _base_send_ioc_init(struct MPT3SAS_ADAPTER *ioc)
 	if (ioc->rdpq_array_enable) {
 		reply_post_free_array_sz = ioc->reply_queue_count *
 		    sizeof(Mpi2IOCInitRDPQArrayEntry);
-		reply_post_free_array = pci_alloc_consistent(ioc->pdev,
-			reply_post_free_array_sz, &reply_post_free_array_dma);
-		if (!reply_post_free_array) {
-			pr_err(MPT3SAS_FMT
-			"reply_post_free_array: pci_alloc_consistent failed\n",
-			ioc->name);
-			r = -ENOMEM;
-			goto out;
-		}
-		memset(reply_post_free_array, 0, reply_post_free_array_sz);
+		memset(ioc->reply_post_free_array, 0, reply_post_free_array_sz);
 		for (i = 0; i < ioc->reply_queue_count; i++)
-			reply_post_free_array[i].RDPQBaseAddress =
+			ioc->reply_post_free_array[i].RDPQBaseAddress =
 			    cpu_to_le64(
 				(u64)ioc->reply_post[i].reply_post_free_dma);
 		mpi_request.MsgFlags = MPI2_IOCINIT_MSGFLAG_RDPQ_ARRAY_MODE;
 		mpi_request.ReplyDescriptorPostQueueAddress =
-		    cpu_to_le64((u64)reply_post_free_array_dma);
+		    cpu_to_le64((u64)ioc->reply_post_free_array_dma);
 	} else {
 		mpi_request.ReplyDescriptorPostQueueAddress =
 		    cpu_to_le64((u64)ioc->reply_post[0].reply_post_free_dma);
@@ -5571,7 +5589,7 @@ _base_send_ioc_init(struct MPT3SAS_ADAPTER *ioc)
 	if (r != 0) {
 		pr_err(MPT3SAS_FMT "%s: handshake failed (r=%d)\n",
 		    ioc->name, __func__, r);
-		goto out;
+		return r;
 	}
 
 	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
@@ -5581,11 +5599,6 @@ _base_send_ioc_init(struct MPT3SAS_ADAPTER *ioc)
 		r = -EIO;
 	}
 
-out:
-	if (reply_post_free_array)
-		pci_free_consistent(ioc->pdev, reply_post_free_array_sz,
-				    reply_post_free_array,
-				    reply_post_free_array_dma);
 	return r;
 }
 

drivers/scsi/mpt3sas/mpt3sas_base.h

@@ -1315,6 +1315,9 @@ struct MPT3SAS_ADAPTER {
 	u8		rdpq_array_enable;
 	u8		rdpq_array_enable_assigned;
 	struct dma_pool *reply_post_free_dma_pool;
+	struct dma_pool *reply_post_free_array_dma_pool;
+	Mpi2IOCInitRDPQArrayEntry *reply_post_free_array;
+	dma_addr_t reply_post_free_array_dma;
 	u8		reply_queue_count;
 	struct list_head reply_queue_list;