Re: [PATCH 22/34] dma-mapping: add an arch_dma_supported hook
From: Randy Dunlap <hidden>
Date: 2018-02-02 17:48:39
Also in:
linux-arch, linux-arm-kernel, linux-iommu, linux-mips, linux-s390, linux-sh, linuxppc-dev, lkml, sparclinux
On 01/12/2018 12:42 AM, Christoph Hellwig wrote:
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> --- arch/x86/include/asm/dma-mapping.h | 3 +++ arch/x86/kernel/pci-dma.c | 19 ++++++++++++------- include/linux/dma-mapping.h | 11 +++++++++++ 3 files changed, 26 insertions(+), 7 deletions(-)
quoted hunk ↗ jump to hunk
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 88bcb1a8211d..d67742dad904 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h@@ -576,6 +576,14 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) return 0; } +/* + * This is a hack for the legacy x86 forbid_dac and iommu_sac_force. Please + * don't use this is new code.
in new code.
+ */ +#ifndef arch_dma_supported +#define arch_dma_supported(dev, mask) (1) +#endif
-- ~Randy