From 6c8d74caa2fa33908ecd07fb1cf1b7bc629b367a Mon Sep 17 00:00:00 2001 From: Samuel Li Date: Wed, 18 Apr 2018 16:15:52 -0400 Subject: [PATCH] drm/amdgpu: Enable scatter gather display support Enables sg display if vram size <= THRESHOLD(256M); otherwise still use vram as display buffer. This patch fixed some potention issues introduced by change "allow framebuffer in GART memory as well" due to CZ/ST hardware limitation. v2: Change default setting to auto. v3: Move some logic from amdgpu_display_framebuffer_domains() to pin function, suggested by Christian. v4: Split into several patches. v5: Drop module parameter for now. Signed-off-by: Samuel Li Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 75700552c71d..03a2c0be0bf2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -138,6 +138,7 @@ extern int amdgpu_si_support; extern int amdgpu_cik_support; #endif +#define AMDGPU_SG_THRESHOLD (256*1024*1024) #define AMDGPU_DEFAULT_GTT_SIZE_MB 3072ULL /* 3GB by default */ #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS 3000 #define AMDGPU_MAX_USEC_TIMEOUT 100000 /* 100 ms */ diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index 1985c08413c6..e62153a86001 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -701,6 +701,15 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain, return -EINVAL; } + /* This assumes only APU display buffers are pinned with (VRAM|GTT). + * See function amdgpu_display_supported_domains() + */ + if (domain == (AMDGPU_GEM_DOMAIN_VRAM | AMDGPU_GEM_DOMAIN_GTT)) { + domain = AMDGPU_GEM_DOMAIN_VRAM; + if (adev->gmc.real_vram_size <= AMDGPU_SG_THRESHOLD) + domain = AMDGPU_GEM_DOMAIN_GTT; + } + if (bo->pin_count) { uint32_t mem_type = bo->tbo.mem.mem_type;