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);
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