diff options
Diffstat (limited to 'debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch')
| -rw-r--r-- | debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch b/debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch new file mode 100644 index 000000000..1717d8fe2 --- /dev/null +++ b/debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch @@ -0,0 +1,91 @@ +From: Ben Hutchings <ben@decadent.org.uk> +Date: Wed, 21 Aug 2019 00:05:30 +0100 +Subject: intel-iommu: Add option to exclude integrated GPU only +Bug-Debian: https://bugs.debian.org/935270 +Bug-Kali: https://bugs.kali.org/view.php?id=5644 + +There is still laptop firmware that touches the integrated GPU behind +the operating system's back, and doesn't say so in the RMRR table. +Enabling the IOMMU for all devices causes breakage, but turning it off +for all graphics devices seems like a major weakness. + +Add an option, intel_iommu=igpu_off, to exclude only integrated GPUs +from remapping. This is a narrower exclusion than igfx_off: it only +affects Intel devices on the root bus. Devices attached through an +external port (Thunderbolt or ExpressCard) won't be on the root bus. + +Signed-off-by: Ben Hutchings <ben@decadent.org.uk> +--- + Documentation/admin-guide/kernel-parameters.txt | 2 ++ + drivers/iommu/intel/iommu.c | 14 ++++++++++++++ + 2 files changed, 16 insertions(+) + +--- a/Documentation/admin-guide/kernel-parameters.txt ++++ b/Documentation/admin-guide/kernel-parameters.txt +@@ -1837,6 +1837,8 @@ + bypassed by not enabling DMAR with this option. In + this case, gfx device will use physical address for + DMA. ++ intgpu_off [Default Off] ++ Bypass the DMAR unit for an integrated GPU only. + forcedac [X86-64] + With this option iommu will not optimize to look + for io virtual address below 32-bit forcing dual +--- a/drivers/iommu/intel/iommu.c ++++ b/drivers/iommu/intel/iommu.c +@@ -54,6 +54,9 @@ + #define CONTEXT_SIZE VTD_PAGE_SIZE + + #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) ++#define IS_INTGPU_DEVICE(pdev) (IS_GFX_DEVICE(pdev) && \ ++ (pdev)->vendor == 0x8086 && \ ++ pci_is_root_bus((pdev)->bus)) + #define IS_USB_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB) + #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) + #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e) +@@ -351,6 +354,7 @@ int intel_iommu_enabled = 0; + EXPORT_SYMBOL_GPL(intel_iommu_enabled); + + static int dmar_map_gfx = 1; ++static int dmar_map_intgpu = 1; + static int dmar_forcedac; + static int intel_iommu_strict; + static int intel_iommu_superpage = 1; +@@ -360,6 +364,7 @@ static int iommu_skip_te_disable; + + #define IDENTMAP_GFX 2 + #define IDENTMAP_AZALIA 4 ++#define IDENTMAP_INTGPU 8 + + int intel_iommu_gfx_mapped; + EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped); +@@ -445,6 +450,9 @@ static int __init intel_iommu_setup(char + } else if (!strncmp(str, "igfx_off", 8)) { + dmar_map_gfx = 0; + pr_info("Disable GFX device mapping\n"); ++ } else if (!strncmp(str, "intgpu_off", 8)) { ++ dmar_map_intgpu = 0; ++ pr_info("Disable integrated GPU device mapping\n"); + } else if (!strncmp(str, "forcedac", 8)) { + pr_info("Forcing DAC for PCI devices\n"); + dmar_forcedac = 1; +@@ -2890,6 +2898,9 @@ static int device_def_domain_type(struct + + if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev)) + return IOMMU_DOMAIN_IDENTITY; ++ ++ if ((iommu_identity_mapping & IDENTMAP_INTGPU) && IS_INTGPU_DEVICE(pdev)) ++ return IOMMU_DOMAIN_IDENTITY; + } + + return 0; +@@ -3325,6 +3336,9 @@ static int __init init_dmars(void) + if (!dmar_map_gfx) + iommu_identity_mapping |= IDENTMAP_GFX; + ++ if (!dmar_map_intgpu) ++ iommu_identity_mapping |= IDENTMAP_INTGPU; ++ + check_tylersburg_isoch(); + + ret = si_domain_init(hw_pass_through); |