IP Discovery data is TMR fenced by the latest PSP BL,
so we need to reserve this region.
Signed-off-by: Xiaojie Yuan <xiaojie.yuan@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index be0b2c69c223..6775647f0ba5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -812,6 +812,7 @@ struct amdgpu_device {
uint8_t *bios;
uint32_t bios_size;
struct amdgpu_bo *stolen_vga_memory;
+ struct amdgpu_bo *discovery_memory;
uint32_t bios_scratch_reg_offset;
uint32_t bios_scratch[AMDGPU_BIOS_NUM_SCRATCH];
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index edffc883549a..c3d7eb685a23 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1955,6 +1955,18 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
NULL, &stolen_vga_buf);
if (r)
return r;
+
+ /*
+ * reserve one TMR (64K) memory at the top of VRAM which holds
+ * IP Discovery data and is protected by PSP.
+ */
+ r = amdgpu_bo_create_kernel(adev, 64 << 10, PAGE_SIZE,
+ AMDGPU_GEM_DOMAIN_VRAM,
+ &adev->discovery_memory,
+ NULL, NULL);
+ if (r)
+ return r;
+
DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
(unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
@@ -2024,6 +2036,9 @@ void amdgpu_ttm_late_init(struct amdgpu_device *adev)
void *stolen_vga_buf;
/* return the VGA stolen memory (if any) back to VRAM */
amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, &stolen_vga_buf);
+
+ /* return the IP Discovery TMR memory back to VRAM */
+ amdgpu_bo_free_kernel(&adev->discovery_memory, NULL, NULL);
}
/**
--
2.20.1
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