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_gmc.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
(limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c')
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 7061c4a0e421..86d28dca4f1d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -785,3 +785,19 @@ uint64_t amdgpu_gmc_vram_cpu_pa(struct amdgpu_device *adev, struct amdgpu_bo *bo
{
return amdgpu_bo_gpu_offset(bo) - adev->gmc.vram_start + adev->gmc.aper_base;
}
+
+void amdgpu_gmc_get_reserved_allocation(struct amdgpu_device *adev)
+{
+ /* Some ASICs need to reserve a region of video memory to avoid access
+ * from driver */
+ switch (adev->asic_type) {
+ case CHIP_YELLOW_CARP:
+ adev->mman.stolen_reserved_offset = 0x1ffb0000;
+ adev->mman.stolen_reserved_size = 64 * PAGE_SIZE;
+ break;
+ default:
+ adev->mman.stolen_reserved_offset = 0;
+ adev->mman.stolen_reserved_size = 0;
+ break;
+ }
+}
--
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