Subject: + arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled.patch added to -mm tree
To: akinobu.mita@xxxxxxxxx,andi@xxxxxxxxxxxxxx,ddutile@xxxxxxxxxx,dwmw2@xxxxxxxxxxxxx,hpa@xxxxxxxxx,konrad.wilk@xxxxxxxxxx,m.szyprowski@xxxxxxxxxxx,mingo@xxxxxxxxxx,tglx@xxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 21 Apr 2014 14:11:08 -0700
The patch titled
Subject: arch/x86/kernel/pci-dma.c: fix dma_generic_alloc_coherent() when CONFIG_DMA_CMA is enabled
has been added to the -mm tree. Its filename is
arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled.patch
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From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Subject: arch/x86/kernel/pci-dma.c: fix dma_generic_alloc_coherent() when CONFIG_DMA_CMA is enabled
dma_generic_alloc_coherent() firstly attempts to allocate by
dma_alloc_from_contiguous() if CONFIG_DMA_CMA is enabled. But the memory
region allocated by it may not fit within the device's DMA mask. This
change makes it fall back to usual alloc_pages_node() allocation for such
cases.
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Don Dutile <ddutile@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/pci-dma.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN arch/x86/kernel/pci-dma.c~arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled arch/x86/kernel/pci-dma.c
--- a/arch/x86/kernel/pci-dma.c~arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled
+++ a/arch/x86/kernel/pci-dma.c
@@ -101,8 +101,13 @@ void *dma_generic_alloc_coherent(struct
again:
page = NULL;
/* CMA can be used only in the context which permits sleeping */
- if (flag & __GFP_WAIT)
+ if (flag & __GFP_WAIT) {
page = dma_alloc_from_contiguous(dev, count, get_order(size));
+ if (page && page_to_phys(page) + size > dma_mask) {
+ dma_release_from_contiguous(dev, page, count);
+ page = NULL;
+ }
+ }
/* fallback */
if (!page)
page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
_
Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are
x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled.patch
x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix.patch
x86-enable-dma-cma-with-swiotlb.patch
intel-iommu-integrate-dma-cma.patch
memblock-introduce-memblock_alloc_range.patch
cma-add-placement-specifier-for-cma=-kernel-parameter.patch
arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled.patch
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