diff options
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index a97d88314b1b..d1aa291b2638 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -363,11 +363,31 @@ int amdgpu_bo_create_restricted(struct amdgpu_device *adev, bo->flags = flags; +#ifdef CONFIG_X86_32 + /* XXX: Write-combined CPU mappings of GTT seem broken on 32-bit + * See https://bugs.freedesktop.org/show_bug.cgi?id=84627 + */ + bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC; +#elif defined(CONFIG_X86) && !defined(CONFIG_X86_PAT) + /* Don't try to enable write-combining when it can't work, or things + * may be slow + * See https://bugs.freedesktop.org/show_bug.cgi?id=88758 + */ + +#warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance \ + thanks to write-combining + + if (bo->flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC) + DRM_INFO_ONCE("Please enable CONFIG_MTRR and CONFIG_X86_PAT for " + "better performance thanks to write-combining\n"); + bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC; +#else /* For architectures that don't support WC memory, * mask out the WC flag from the BO */ if (!drm_arch_can_wc_memory()) bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC; +#endif amdgpu_fill_placement_to_bo(bo, placement); /* Kernel allocation are uninterruptible */ |