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| author | Christoph Hellwig <hch@lst.de> | 2017-12-23 11:01:41 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-01-15 09:34:59 +0100 |
| commit | cea9d03c822cf1b8e90cc4fc51be6d248fb5d776 (patch) | |
| tree | bb10e17d163c6acca0b72d24abb7e79686a58f64 /arch/x86/kernel/pci-dma.c | |
| parent | 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7 (diff) | |
| download | linux-cea9d03c822cf1b8e90cc4fc51be6d248fb5d776.tar.bz2 | |
dma-mapping: add an arch_dma_supported hook
To implement the x86 forbid_dac and iommu_sac_force we want an arch hook
so that it can apply the global options across all dma_map_ops
implementations.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 61a8f1cb3829..df7ab02f959f 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -215,7 +215,7 @@ static __init int iommu_setup(char *p) } early_param("iommu", iommu_setup); -int x86_dma_supported(struct device *dev, u64 mask) +int arch_dma_supported(struct device *dev, u64 mask) { #ifdef CONFIG_PCI if (mask > 0xffffffff && forbid_dac > 0) { @@ -224,12 +224,6 @@ int x86_dma_supported(struct device *dev, u64 mask) } #endif - /* Copied from i386. Doesn't make much sense, because it will - only work for pci_alloc_coherent. - The caller just has to use GFP_DMA in this case. */ - if (mask < DMA_BIT_MASK(24)) - return 0; - /* Tell the device to use SAC when IOMMU force is on. This allows the driver to use cheaper accesses in some cases. @@ -249,6 +243,17 @@ int x86_dma_supported(struct device *dev, u64 mask) return 1; } +EXPORT_SYMBOL(arch_dma_supported); + +int x86_dma_supported(struct device *dev, u64 mask) +{ + /* Copied from i386. Doesn't make much sense, because it will + only work for pci_alloc_coherent. + The caller just has to use GFP_DMA in this case. */ + if (mask < DMA_BIT_MASK(24)) + return 0; + return 1; +} static int __init pci_iommu_init(void) { |