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| author | Alessandro Rubini <rubini@gnudd.com> | 2012-04-04 19:39:58 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-04-12 20:09:56 +0200 |
| commit | 4692d77fc3c8978a36406a3cf9e8b899f86f68f1 (patch) | |
| tree | 44466891638efecf6e0253f9a87a48739924f397 /arch/x86 | |
| parent | Linux 3.4-rc2 (diff) | |
| download | linux-4692d77fc3c8978a36406a3cf9e8b899f86f68f1.tar.xz linux-4692d77fc3c8978a36406a3cf9e8b899f86f68f1.zip | |
x86-32: Introduce CONFIG_X86_DEV_DMA_OPS
32-bit x86 systems may need their own DMA operations, so add
a new config option, which is turned on for 64-bit systems. This
patch has no functional effect but it paves the way for supporting
the STA2x11 I/O Hub and possibly other chips.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Link: http://lkml.kernel.org/r/f79fcc1a2e17ef942e1b798b92aac43a80202532.1333560789.git.rubini@gnudd.com
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig | 5 | ||||
| -rw-r--r-- | arch/x86/include/asm/device.h | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/dma-mapping.h | 2 |
3 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1d14cc6b79ad..07b412aed38b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -12,6 +12,7 @@ config X86_32 config X86_64 def_bool 64BIT + select X86_DEV_DMA_OPS ### Arch settings config X86 @@ -2215,6 +2216,10 @@ config HAVE_TEXT_POKE_SMP bool select STOP_MACHINE if SMP +config X86_DEV_DMA_OPS + bool + depends on X86_64 + source "net/Kconfig" source "drivers/Kconfig" diff --git a/arch/x86/include/asm/device.h b/arch/x86/include/asm/device.h index 63a2a03d7d51..93e1c55f14ab 100644 --- a/arch/x86/include/asm/device.h +++ b/arch/x86/include/asm/device.h @@ -5,8 +5,8 @@ struct dev_archdata { #ifdef CONFIG_ACPI void *acpi_handle; #endif -#ifdef CONFIG_X86_64 -struct dma_map_ops *dma_ops; +#ifdef CONFIG_X86_DEV_DMA_OPS + struct dma_map_ops *dma_ops; #endif #if defined(CONFIG_INTEL_IOMMU) || defined(CONFIG_AMD_IOMMU) void *iommu; /* hook for IOMMU specific extension */ diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index 4b4331d71935..09aa473e2917 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -30,7 +30,7 @@ extern struct dma_map_ops *dma_ops; static inline struct dma_map_ops *get_dma_ops(struct device *dev) { -#ifdef CONFIG_X86_32 +#ifndef CONFIG_X86_DEV_DMA_OPS return dma_ops; #else if (unlikely(!dev) || !dev->archdata.dma_ops) |