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authorDavid Woodhouse <David.Woodhouse@intel.com>2009-07-04 13:59:46 +0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-07-04 13:59:46 +0400
commit62edf5dc4a524e4cb525e6020b955a1ad593d9ba (patch)
treee811a942b7661fc9e97f1611ee75e7f125d51365 /arch
parent40e4aa34324bff3938a900014254f88943d05e15 (diff)
downloadlinux-62edf5dc4a524e4cb525e6020b955a1ad593d9ba.tar.xz
intel-iommu: Restore DMAR_BROKEN_GFX_WA option for broken graphics drivers
We need to give people a little more time to fix the broken drivers. Re-introduce this, but tied in properly with the 'iommu=pt' support this time. Change the config option name and make it default to 'no' too. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/Kconfig12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c07f72205909..738bdc6b0f8b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1913,6 +1913,18 @@ config DMAR_DEFAULT_ON
recommended you say N here while the DMAR code remains
experimental.
+config DMAR_BROKEN_GFX_WA
+ def_bool n
+ prompt "Workaround broken graphics drivers (going away soon)"
+ depends on DMAR
+ ---help---
+ 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.
+
config DMAR_FLOPPY_WA
def_bool y
depends on DMAR