diff options
Diffstat (limited to 'linux-2.6-intel-iommu-igfx.patch')
| -rw-r--r-- | linux-2.6-intel-iommu-igfx.patch | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/linux-2.6-intel-iommu-igfx.patch b/linux-2.6-intel-iommu-igfx.patch new file mode 100644 index 000000000..44fd14186 --- /dev/null +++ b/linux-2.6-intel-iommu-igfx.patch @@ -0,0 +1,78 @@ +Subject: [PATCH] [intel_iommu] Default to igfx_off +From: drago01 <drago01@gmail.com> +To: fedora-kernel-list <fedora-kernel-list@redhat.com> + +This option seems to causes way to many issues, it is +being investigated by Intel's chipset team for months now and +we still don't have any outcome. + +The results so far are "black screen when starting X", +"system hangs when using GL", "system does not resume". + +The patch adds an intel_iommu=igfx_on option, which makes it opt in, +rather than opt out. + +Signed-off-by: Adel Gadllah <adel.gadllah@gmail.com> +Reviewed-by: Adam Jackson <ajax@redhat.com> +--- + Documentation/kernel-parameters.txt | 11 +++++------ + drivers/pci/intel-iommu.c | 9 +++++---- + 2 files changed, 10 insertions(+), 10 deletions(-) + +diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt +index e7848a0..9914485 100644 +--- a/Documentation/kernel-parameters.txt ++++ b/Documentation/kernel-parameters.txt +@@ -992,12 +992,11 @@ and is between 256 and 4096 characters. It is defined in the file + Enable intel iommu driver. + off + Disable intel iommu driver. +- igfx_off [Default Off] +- By default, gfx is mapped as normal device. If a gfx +- device has a dedicated DMAR unit, the DMAR unit is +- bypassed by not enabling DMAR with this option. In +- this case, gfx device will use physical address for +- DMA. ++ igfx_on [Default Off] ++ By default, the gfx's DMAR unit is bypassed by not enabling ++ DMAR with this option. So the gfx device will use physical ++ address for DMA. When this option is enabled it the gfx is ++ mapped as normal device. + forcedac [x86_64] + With this option iommu will not optimize to look + for io virtual address below 32 bit forcing dual +diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c +index 4173125..8f36786 100644 +--- a/drivers/pci/intel-iommu.c ++++ b/drivers/pci/intel-iommu.c +@@ -340,7 +340,8 @@ int dmar_disabled = 0; + int dmar_disabled = 1; + #endif /*CONFIG_DMAR_DEFAULT_ON*/ + +-static int dmar_map_gfx = 1; ++/* disabled by default; causes way too many issues */ ++static int dmar_map_gfx = 0; + static int dmar_forcedac; + static int intel_iommu_strict; + +@@ -361,10 +362,10 @@ static int __init intel_iommu_setup(char *str) + } else if (!strncmp(str, "off", 3)) { + dmar_disabled = 1; + printk(KERN_INFO "Intel-IOMMU: disabled\n"); +- } else if (!strncmp(str, "igfx_off", 8)) { +- dmar_map_gfx = 0; ++ } else if (!strncmp(str, "igfx_on", 7)) { ++ dmar_map_gfx = 1; + printk(KERN_INFO +- "Intel-IOMMU: disable GFX device mapping\n"); ++ "Intel-IOMMU: enabled GFX device mapping\n"); + } else if (!strncmp(str, "forcedac", 8)) { + printk(KERN_INFO + "Intel-IOMMU: Forcing DAC for PCI devices\n"); +-- +1.6.6.1 +_______________________________________________ +kernel mailing list +kernel@lists.fedoraproject.org +https://admin.fedoraproject.org/mailman/listinfo/kernel + |