From a2e2f29970aa1e53219e3499382c41d61c8959f8 Mon Sep 17 00:00:00 2001 From: Nils Holland Date: Sun, 22 Jan 2017 20:15:27 +0100 Subject: [PATCH] drm/amdgpu: Bring bo creation in line with radeon driver (v2) MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Christian König Signed-off-by: Nils Holland Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) 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 */ -- 2.30.2