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CONFIG_DMAR_BROKEN_GFX_WA: Workaround broken graphics drivers (going away soon)

General informations

The Linux kernel configuration item CONFIG_DMAR_BROKEN_GFX_WA has multiple definitions:

Workaround broken graphics drivers (going away soon) found in arch/x86/Kconfig

The configuration item CONFIG_DMAR_BROKEN_GFX_WA:

• prompt: Workaround broken graphics drivers (going away soon)
• type: bool
• depends on: CONFIG_DMAR && CONFIG_BROKEN
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.31–2.6.39, 3.0

Help text

Current Graphics drivers tend to use physical address for DMA and avoid using DMA APIs. Setting this config option permits the IOMMU driver to set a unity map for all the OS-visible memory. Hence the driver can continue to use physical addresses for DMA, at least until this option is removed in the 2.6.32 kernel.

Workaround broken graphics drivers (going away soon) found in drivers/iommu/Kconfig

The configuration item CONFIG_DMAR_BROKEN_GFX_WA:

• prompt: Workaround broken graphics drivers (going away soon)
• type: bool
• depends on: CONFIG_DMAR && CONFIG_BROKEN && CONFIG_X86
• defined in drivers/iommu/Kconfig
• found in Linux kernels: 3.1

Help text

Current Graphics drivers tend to use physical address for DMA and avoid using DMA APIs. Setting this config option permits the IOMMU driver to set a unity map for all the OS-visible memory. Hence the driver can continue to use physical addresses for DMA, at least until this option is removed in the 2.6.32 kernel.

Hardware

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