linux-kernel - [PATCH AUTOSEL 5.3 19/87] drm/amdgpu: Fix hard hang for S/G display BOs.

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Date:   Tue, 24 Sep 2019 12:40:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Shirish S <shirish.s@....com>, Sasha Levin <sashal@...nel.org>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.3 19/87] drm/amdgpu: Fix hard hang for S/G display BOs.

From: Andrey Grodzovsky <andrey.grodzovsky@....com>

[ Upstream commit e4c4073b0139d055d43a9568690fc560aab4fa5c ]

HW requires for caching to be unset for scanout BO
mappings when the BO placement is in GTT memory.
Usually the flag to unset is passed from user mode
but for FB mode this was missing.

v2:
Keep all BO placement logic in amdgpu_display_supported_domains

Suggested-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Tested-by: Shirish S <shirish.s@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c  | 7 +++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 3 ++-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index eb3569b46c1e1..430c56f9544a1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -139,14 +139,14 @@ static int amdgpufb_create_pinned_object(struct amdgpu_fbdev *rfbdev,
 	mode_cmd->pitches[0] = amdgpu_align_pitch(adev, mode_cmd->width, cpp,
 						  fb_tiled);
 	domain = amdgpu_display_supported_domains(adev);
-
 	height = ALIGN(mode_cmd->height, 8);
 	size = mode_cmd->pitches[0] * height;
 	aligned_size = ALIGN(size, PAGE_SIZE);
 	ret = amdgpu_gem_object_create(adev, aligned_size, 0, domain,
 				       AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
-				       AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS |
-				       AMDGPU_GEM_CREATE_VRAM_CLEARED,
+				       AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS     |
+				       AMDGPU_GEM_CREATE_VRAM_CLEARED 	     |
+				       AMDGPU_GEM_CREATE_CPU_GTT_USWC,
 				       ttm_bo_type_kernel, NULL, &gobj);
 	if (ret) {
 		pr_err("failed to allocate framebuffer (%d)\n", aligned_size);
@@ -168,7 +168,6 @@ static int amdgpufb_create_pinned_object(struct amdgpu_fbdev *rfbdev,
 			dev_err(adev->dev, "FB failed to set tiling flags\n");
 	}
 
-
 	ret = amdgpu_bo_pin(abo, domain);
 	if (ret) {
 		amdgpu_bo_unreserve(abo);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 939f8305511b8..fb291366d5ade 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -747,7 +747,8 @@ int amdgpu_mode_dumb_create(struct drm_file *file_priv,
 	struct amdgpu_device *adev = dev->dev_private;
 	struct drm_gem_object *gobj;
 	uint32_t handle;
-	u64 flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
+	u64 flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
+		    AMDGPU_GEM_CREATE_CPU_GTT_USWC;
 	u32 domain;
 	int r;
 
-- 
2.20.1