[SCSI] Support devices with protection information

Implement support for DMA of protection information for devices that
are data integrity capable.

 - Add support for mapping an extra scatter-gather list containing
   the protection information.

 - Allocate protection scsi_data_buffer if host is DIX (integrity DMA)
   capable.

 - Accessor function for checking whether a device has protection
   enabled.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index fe77ccacf319..a47c05d7829a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -65,7 +65,7 @@ static struct scsi_host_sg_pool scsi_sg_pools[] = {
 };
 #undef SP
 
-static struct kmem_cache *scsi_sdb_cache;
+struct kmem_cache *scsi_sdb_cache;
 
 static void scsi_run_queue(struct request_queue *q);
 
@@ -787,6 +787,9 @@ void scsi_release_buffers(struct scsi_cmnd *cmd)
                 kmem_cache_free(scsi_sdb_cache, bidi_sdb);
                 cmd->request->next_rq->special = NULL;
         }
+
+        if (scsi_prot_sg_count(cmd))
+                scsi_free_sgtable(cmd->prot_sdb);
 }
 EXPORT_SYMBOL(scsi_release_buffers);
 
@@ -1072,6 +1075,26 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
                         goto err_exit;
         }
 
+        if (blk_integrity_rq(cmd->request)) {
+                struct scsi_data_buffer *prot_sdb = cmd->prot_sdb;
+                int ivecs, count;
+
+                BUG_ON(prot_sdb == NULL);
+                ivecs = blk_rq_count_integrity_sg(cmd->request);
+
+                if (scsi_alloc_sgtable(prot_sdb, ivecs, gfp_mask)) {
+                        error = BLKPREP_DEFER;
+                        goto err_exit;
+                }
+
+                count = blk_rq_map_integrity_sg(cmd->request,
+                                                prot_sdb->table.sgl);
+                BUG_ON(unlikely(count > ivecs));
+
+                cmd->prot_sdb = prot_sdb;
+                cmd->prot_sdb->table.nents = count;
+        }
+
         return BLKPREP_OK ;
 
 err_exit: