Commit 0c02a20f authored by David Woodhouse's avatar David Woodhouse
Browse files

intel-iommu: Kill DMAR_BROKEN_GFX_WA option. 



Just make it depend on BROKEN for now, in case people scream really loud
about it (and because we might want to keep some of this logic for an
upcoming BIOS workaround, so I don't just want to rip it out entirely
just yet). But for graphics devices, it really ought to be unnecessary.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 64de5af0

Documentation/Intel-IOMMU.txt

+1 −5
Original line number Diff line number Diff line
@@ -56,11 +56,7 @@ Graphics Problems? 
------------------

If you encounter issues with graphics devices, you can try adding

option intel_iommu=igfx_off to turn off the integrated graphics engine.



If it happens to be a PCI device included in the INCLUDE_ALL Engine,

then try enabling CONFIG_DMAR_GFX_WA to setup a 1-1 map. We hear

graphics drivers may be in process of using DMA api's in the near

future and at that time this option can be yanked out.

If this fixes anything, please ensure you file a bug reporting the problem.



Some exceptions to IOVA

-----------------------

arch/x86/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -1916,7 +1916,7 @@ config DMAR_DEFAULT_ON 
config DMAR_BROKEN_GFX_WA

	def_bool n

	prompt "Workaround broken graphics drivers (going away soon)"

	depends on DMAR

	depends on DMAR && BROKEN

	---help---

	  Current Graphics drivers tend to use physical address

	  for DMA and avoid using DMA APIs. Setting this config

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