[SCSI] mpt2sas: Use of get_free_pages for huge memorary allocation.

use the get_free_pages API for larger contigious physical memory chunk.
Also, the ioc->chain_depth need to be changed from
a 16bit to 32bit variable because the number of chains will exceed 64k
when the queue depth is large.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 10 insertions, 7 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 2e6e45a2803f..9ad4b48a9b62 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1901,7 +1901,7 @@ _base_release_memory_pools(struct MPT2SAS_ADAPTER *ioc)
                     ioc->config_page, ioc->config_page_dma);
         }
 
-        kfree(ioc->scsi_lookup);
+        free_pages((ulong)ioc->scsi_lookup, ioc->scsi_lookup_pages);
         kfree(ioc->hpr_lookup);
         kfree(ioc->internal_lookup);
 }
@@ -2113,11 +2113,13 @@ _base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc,  int sleep_flag)
             ioc->name, (unsigned long long) ioc->request_dma));
         total_sz += sz;
 
-        ioc->scsi_lookup = kcalloc(ioc->scsiio_depth,
-            sizeof(struct request_tracker), GFP_KERNEL);
+        sz = ioc->scsiio_depth * sizeof(struct request_tracker);
+        ioc->scsi_lookup_pages = get_order(sz);
+        ioc->scsi_lookup = (struct request_tracker *)__get_free_pages(
+            GFP_KERNEL, ioc->scsi_lookup_pages);
         if (!ioc->scsi_lookup) {
-                printk(MPT2SAS_ERR_FMT "scsi_lookup: kcalloc failed\n",
-                    ioc->name);
+                printk(MPT2SAS_ERR_FMT "scsi_lookup: get_free_pages failed, "
+                    "sz(%d)\n", ioc->name, (int)sz);
                 goto out;
         }
 
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 142b694c9de5..cdedfcbb8ca7 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -676,7 +676,8 @@ struct MPT2SAS_ADAPTER {
         dma_addr_t      request_dma;
         u32             request_dma_sz;
         struct request_tracker *scsi_lookup;
-        spinlock_t scsi_lookup_lock;
+        ulong           scsi_lookup_pages;
+        spinlock_t      scsi_lookup_lock;
         struct list_head free_list;
         int             pending_io_count;
         wait_queue_head_t reset_wq;
@@ -688,7 +689,7 @@ struct MPT2SAS_ADAPTER {
         u16             max_sges_in_chain_message;
         u16             chains_needed_per_io;
         u16             chain_offset_value_for_main_message;
-        u16             chain_depth;
+        u32             chain_depth;
 
         /* hi-priority queue */
         u16             hi_priority_smid;