diff options
| author | Oak Zeng <Oak.Zeng@amd.com> | 2021-01-22 13:00:06 -0600 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-03-23 22:58:24 -0400 |
| commit | 35d5f224a5593028ecbc784d7c6cb0c77fb3aac3 (patch) | |
| tree | 782529c8e243e7b2874256576784cee2706b47cb /drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | |
| parent | debd629a633670527c78f33ab4774899795fc01e (diff) | |
| download | linux-35d5f224a5593028ecbc784d7c6cb0c77fb3aac3.tar.bz2 | |
drm/amdgpu: Don't reserve vram as WC for A+A
On A+A platform, vram can be mapped as WB. Not necessarily
to always map vram as WC on such platform.
Calling function arch_io_reserve_memtype_wc will mark the
whole vram region as WC. So don't call it for A+A platform.
Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian Konig <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_object.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index 4b29b8205442..de52a99916f8 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -1065,13 +1065,17 @@ static const char *amdgpu_vram_names[] = { */ int amdgpu_bo_init(struct amdgpu_device *adev) { - /* reserve PAT memory space to WC for VRAM */ - arch_io_reserve_memtype_wc(adev->gmc.aper_base, - adev->gmc.aper_size); + /* On A+A platform, VRAM can be mapped as WB */ + if (!adev->gmc.xgmi.connected_to_cpu) { + /* reserve PAT memory space to WC for VRAM */ + arch_io_reserve_memtype_wc(adev->gmc.aper_base, + adev->gmc.aper_size); + + /* Add an MTRR for the VRAM */ + adev->gmc.vram_mtrr = arch_phys_wc_add(adev->gmc.aper_base, + adev->gmc.aper_size); + } - /* Add an MTRR for the VRAM */ - adev->gmc.vram_mtrr = arch_phys_wc_add(adev->gmc.aper_base, - adev->gmc.aper_size); DRM_INFO("Detected VRAM RAM=%lluM, BAR=%lluM\n", adev->gmc.mc_vram_size >> 20, (unsigned long long)adev->gmc.aper_size >> 20); @@ -1089,8 +1093,10 @@ int amdgpu_bo_init(struct amdgpu_device *adev) void amdgpu_bo_fini(struct amdgpu_device *adev) { amdgpu_ttm_fini(adev); - arch_phys_wc_del(adev->gmc.vram_mtrr); - arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size); + if (!adev->gmc.xgmi.connected_to_cpu) { + arch_phys_wc_del(adev->gmc.vram_mtrr); + arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size); + } } /** |