From e15a5fb9b6ac2556a4fe59dba5faa34c695e8b73 Mon Sep 17 00:00:00 2001
From: Huang Rui <ray.huang@amd.com>
Date: Wed, 16 Dec 2020 17:21:27 +0800
Subject: drm/amdgpu: introduce a stolen reserved buffer to protect specific
buffer region (v2)
Some ASICs such as Yellow Carp needs to reserve a region of video memory
to avoid access from driver. So this patch is to introduce a stolen
reserved buffer to protect specific buffer region.
v2: free this buffer in amdgpu_ttm_fini.
Signed-off-by: Huang Rui <ray.huang@amd.com>
Acked-and-Tested-by: Aaron Liu <aaron.liu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 10 ++++++++++
1 file changed, 10 insertions(+)
(limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c')
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 832970cff64c..118911059dc1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1718,6 +1718,13 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
NULL);
if (r)
return r;
+ r = amdgpu_bo_create_kernel_at(adev, adev->mman.stolen_reserved_offset,
+ adev->mman.stolen_reserved_size,
+ AMDGPU_GEM_DOMAIN_VRAM,
+ &adev->mman.stolen_reserved_memory,
+ NULL);
+ if (r)
+ return r;
DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
(unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
@@ -1787,6 +1794,9 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
amdgpu_bo_free_kernel(&adev->mman.stolen_extended_memory, NULL, NULL);
/* return the IP Discovery TMR memory back to VRAM */
amdgpu_bo_free_kernel(&adev->mman.discovery_memory, NULL, NULL);
+ if (adev->mman.stolen_reserved_size)
+ amdgpu_bo_free_kernel(&adev->mman.stolen_reserved_memory,
+ NULL, NULL);
amdgpu_ttm_fw_reserve_vram_fini(adev);
amdgpu_vram_mgr_fini(adev);
--
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