powerpc: implement the DMA_ATTR_NO_WARN attribute

Add support for the DMA_ATTR_NO_WARN attribute on powerpc iommu code.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mauricio Faria de Oliveira <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 37d6e741be826da51474ab50fe3027cc06400cd5..5f202a566ec5f0296a22a71ac238a63a6a90ba7f 100644 (file)
--- 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 (!(attrs & DMA_ATTR_NO_WARN) &&
+                           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 (!(attrs & DMA_ATTR_NO_WARN) &&
+                           printk_ratelimit())  {
                                dev_info(dev, "iommu_alloc failed, tbl %p "
                                         "vaddr %p npages %d\n", tbl, vaddr,
                                         npages);