linux-kernel - [PATCH v2 3/3] powerpc: implement DMA_ATTR_NO

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Date:	Thu,  7 Jul 2016 09:45:09 -0300
From:	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>
To:	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nvme@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Cc:	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH v2 3/3] powerpc: implement DMA_ATTR_NO_WARN

Add support for the DMA_ATTR_NO_WARN attribute on powerpc iommu code.

Signed-off-by: Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>
---
Changelog:
 v2:
  - address warnings from checkpatch.pl (line wrapping and typos)

 arch/powerpc/kernel/iommu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index a8e3490..f1e20ea 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -479,7 +479,8 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 
 		/* Handle failure */
 		if (unlikely(entry == DMA_ERROR_CODE)) {
-			if (printk_ratelimit())
+			if (unlikely(!dma_get_attr(DMA_ATTR_NO_WARN, attrs)) &&
+			    printk_ratelimit())
 				dev_info(dev, "iommu_alloc failed, tbl %p "
 					 "vaddr %lx npages %lu\n", tbl, vaddr,
 					 npages);
@@ -776,7 +777,8 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
 					 mask >> tbl->it_page_shift, align,
 					 attrs);
 		if (dma_handle == DMA_ERROR_CODE) {
-			if (printk_ratelimit())  {
+			if (unlikely(!dma_get_attr(DMA_ATTR_NO_WARN, attrs)) &&
+			    printk_ratelimit())  {
 				dev_info(dev, "iommu_alloc failed, tbl %p "
 					 "vaddr %p npages %d\n", tbl, vaddr,
 					 npages);
-- 
1.8.3.1