[PATCH 06/17] drm/amdgpu: add support for extended stolen vga memory

[Alex Deucher]

This will allow us to split the allocation for systems
where we have to keep the stolen memory around to avoid
S3 issues.  This way we don't waste as much memory and
still avoid any screen artifacts during the bios to
driver transition.

Reviewed-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 13 +++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index 0cf18f01e67a..8f4af955d72c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -215,6 +215,8 @@ struct amdgpu_gmc {
 	bool			prt_warning;
 	uint64_t		stolen_vga_size;
 	struct amdgpu_bo	*stolen_vga_memory;
+	uint64_t		stolen_extended_size;
+	struct amdgpu_bo	*stolen_extended_memory;
 	bool			keep_stolen_vga_memory;
 	uint32_t		sdpif_register;
 	/* apertures */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index fd61769202b3..ec975251b171 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1915,7 +1915,7 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 	uint64_t gtt_size;
 	int r;
 	u64 vis_vram_limit;
-	void *stolen_vga_buf;
+	void *stolen_vga_buf, *stolen_extended_buf;
 
 	mutex_init(&adev->mman.gtt_window_lock);
 
@@ -1985,6 +1985,13 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 				       &stolen_vga_buf);
 	if (r)
 		return r;
+	r = amdgpu_bo_create_kernel_at(adev, adev->gmc.stolen_vga_size,
+				       adev->gmc.stolen_extended_size,
+				       AMDGPU_GEM_DOMAIN_VRAM,
+				       &adev->gmc.stolen_extended_memory,
+				       &stolen_extended_buf);
+	if (r)
+		return r;
 
 	DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
 		 (unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
@@ -2041,11 +2048,13 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
  */
 void amdgpu_ttm_late_init(struct amdgpu_device *adev)
 {
-	void *stolen_vga_buf;
+	void *stolen_vga_buf, *stolen_extended_buf;
 
 	/* return the VGA stolen memory (if any) back to VRAM */
 	if (!adev->gmc.keep_stolen_vga_memory)
 		amdgpu_bo_free_kernel(&adev->gmc.stolen_vga_memory, NULL, &stolen_vga_buf);
+	amdgpu_bo_free_kernel(&adev->gmc.stolen_extended_memory, NULL,
+			      &stolen_extended_buf);
 }
 
 /**
-- 
2.25.4