[PATCH v2 3/3] nvme: use the DMA_ATTR_NO_WARN attribute

Mauricio Faria de Oliveira mauricfo at linux.vnet.ibm.com
Wed Nov 30 11:14:45 UTC 2016

From: Mauricio Faria de Oliveira <mauricfo at linux.vnet.ibm.com>

BugLink: http://bugs.launchpad.net/bugs/1633128

Use the DMA_ATTR_NO_WARN attribute for the dma_map_sg() call of the nvme
driver that returns BLK_MQ_RQ_QUEUE_BUSY (not for

Signed-off-by: Mauricio Faria de Oliveira <mauricfo at
Reviewed-by: Gabriel Krisman Bertazi <krisman at linux.vnet.ibm.com>
Cc: Keith Busch <keith.busch at intel.com>
Cc: Jens Axboe <axboe at fb.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Krzysztof Kozlowski <k.kozlowski at samsung.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
(back ported from commit 2b6b535d9158b822a45080b3d6d5b2993fd49e5a)
 drivers/nvme/host/pci.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6ea7430b8e25..5aa25a3f1be3 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -18,6 +18,7 @@
 #include <linux/blk-mq.h>
 #include <linux/cpu.h>
 #include <linux/delay.h>
+#include <linux/dma-attrs.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/genhd.h>
@@ -81,6 +82,8 @@ MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes");
 static struct workqueue_struct *nvme_workq;
+static DEFINE_DMA_ATTRS(nvme_dma_attrs);
 struct nvme_dev;
 struct nvme_queue;
@@ -630,7 +633,8 @@ static int nvme_map_data(struct nvme_dev *dev, struct request *req,
 		goto out;
-	if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir))
+	if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir,
+				&nvme_dma_attrs))
 		goto out;
 	if (!nvme_setup_prps(dev, req, blk_rq_bytes(req)))
@@ -2395,6 +2399,9 @@ static int __init nvme_init(void)
 	result = pci_register_driver(&nvme_driver);
 	if (result)
 		goto core_exit;
+	dma_set_attr(DMA_ATTR_NO_WARN, &nvme_dma_attrs);
 	return 0;

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