svn commit: r263278 - head/sys/dev/nvme

[Jim Harris]

Author: jimharris
Date: Mon Mar 17 22:37:17 2014
New Revision: 263278
URL: http://svnweb.freebsd.org/changeset/base/263278

Log:
  nvme:  NVMe specification dictates 4-byte alignment for PRPs (not 8).
  
  Sponsored by:	Intel
  MFC after:	3 days

Modified:
  head/sys/dev/nvme/nvme_qpair.c

Modified: head/sys/dev/nvme/nvme_qpair.c
==============================================================================
--- head/sys/dev/nvme/nvme_qpair.c	Mon Mar 17 22:36:04 2014	(r263277)
+++ head/sys/dev/nvme/nvme_qpair.c	Mon Mar 17 22:37:17 2014	(r263278)
@@ -498,8 +498,9 @@ nvme_qpair_construct(struct nvme_qpair *
 
 	mtx_init(&qpair->lock, "nvme qpair lock", NULL, MTX_DEF);
 
+	/* Note: NVMe PRP format is restricted to 4-byte alignment. */
 	bus_dma_tag_create(bus_get_dma_tag(ctrlr->dev),
-	    sizeof(uint64_t), PAGE_SIZE, BUS_SPACE_MAXADDR,
+	    4, PAGE_SIZE, BUS_SPACE_MAXADDR,
 	    BUS_SPACE_MAXADDR, NULL, NULL, NVME_MAX_XFER_SIZE,
 	    (NVME_MAX_XFER_SIZE/PAGE_SIZE)+1, PAGE_SIZE, 0,
 	    NULL, NULL, &qpair->dma_tag);