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drm/amdgpu: Bring bo creation in line with radeon driver (v2) 

Add the bo creation changes that have been done to the radeon driver in
recent times, e.g. disable GTT WC on 32 bit because it is broken there,
and also disable it generally (and print a warning message) when
CONFIG_X86_PAT is not set.

v2: agd: fix warning in defined(CONFIG_X86) && !defined(CONFIG_X86_PAT)
    case

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Nils Holland <nholland@tisys.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nils Holland 2017-01-22 20:15:27 +01:00 committed by Alex Deucher
parent 08f1408c47
commit a2e2f29970
1 changed files with 20 additions and 0 deletions
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20
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
View File

@ -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 */