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authorLu Baolu <baolu.lu@linux.intel.com>2024-02-27 05:14:34 +0300
committerJoerg Roedel <jroedel@suse.de>2024-03-01 15:51:17 +0300
commit4b8d18c0c986877fe89ade2214e1e81ad817cef1 (patch)
tree9e1c7c602b404edf96bf0c71fd7de5e24fb998be /drivers/iommu
parent54be6c6c5ae8e0d93a6c4641cb7528eb0b6ba478 (diff)
downloadlinux-4b8d18c0c986877fe89ade2214e1e81ad817cef1.tar.xz
iommu/vt-d: Remove INTEL_IOMMU_BROKEN_GFX_WA
Commit 62edf5dc4a524 ("intel-iommu: Restore DMAR_BROKEN_GFX_WA option for broken graphics drivers") was introduced 24 years ago as a temporary workaround for graphics drivers that used physical addresses for DMA and avoided DMA APIs. This workaround was disabled by default. As 24 years have passed, it is expected that graphics driver developers have migrated their drivers to use kernel DMA APIs. Therefore, this workaround is no longer required and could been removed. The Intel iommu driver also provides a "igfx_off" option to turn off the DMA translation for the graphic dedicated IOMMU. Hence, there is really no good reason to keep this config option. Suggested-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20240130060823.57990-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel/Kconfig11
-rw-r--r--drivers/iommu/intel/iommu.c4
2 files changed, 0 insertions, 15 deletions
diff --git a/drivers/iommu/intel/Kconfig b/drivers/iommu/intel/Kconfig
index 012cd2541a68..d2d34eb28d94 100644
--- a/drivers/iommu/intel/Kconfig
+++ b/drivers/iommu/intel/Kconfig
@@ -64,17 +64,6 @@ config INTEL_IOMMU_DEFAULT_ON
one is found. If this option is not selected, DMAR support can
be enabled by passing intel_iommu=on to the kernel.
-config INTEL_IOMMU_BROKEN_GFX_WA
- bool "Workaround broken graphics drivers (going away soon)"
- depends on BROKEN && X86
- 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 INTEL_IOMMU_FLOPPY_WA
def_bool y
depends on X86
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 6fb5f6fceea1..fc52fcd786aa 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2660,10 +2660,6 @@ static int __init init_dmars(void)
iommu_set_root_entry(iommu);
}
-#ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
- dmar_map_gfx = 0;
-#endif
-
if (!dmar_map_gfx)
iommu_identity_mapping |= IDENTMAP_GFX;