[PATCH 2/2] drm/amdgpu: add vram check function for GMC

[Xiaojian Du]

This will add vram check function for GMC, it will cover gmc v8/9/10

Signed-off-by: Xiaojian Du <Xiaojian.Du at amd.com>
Reviewed-by: Huang Rui <ray.huang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 42 +++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h |  1 +
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c  |  4 +++
 drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c   |  6 +++-
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c   |  8 ++++-
 5 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 83f26bca7dac..dbc0de89d7e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -833,3 +833,45 @@ void amdgpu_gmc_get_reserved_allocation(struct amdgpu_device *adev)
 		break;
 	}
 }
+
+int amdgpu_gmc_vram_checking(struct amdgpu_device *adev)
+{
+	int ret, size = 0x100000;
+	uint8_t cptr[10];
+
+	ret = amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
+				AMDGPU_GEM_DOMAIN_VRAM,
+				&adev->vram_bo,
+				&adev->vram_gpu,
+				&adev->vram_ptr);
+	if (ret)
+		return ret;
+
+	memset(adev->vram_ptr, 0x86, size);
+	memset(cptr, 0x86, 10);
+
+	/**
+	* Check the start, the mid, and the end of the memory if the content of
+	* each byte is the pattern "0x86". If yes, we suppose the vram bo is
+	* workable.
+	*
+	* Note: If check the each byte of whole 1M bo, it will cost too many
+	* seconds, so here, we just pick up three parts for emulation.
+	*/
+	ret = memcmp(adev->vram_ptr, cptr, 10);
+	if (ret)
+		return ret;
+
+	ret = memcmp(adev->vram_ptr + (size / 2), cptr, 10);
+	if (ret)
+		return ret;
+
+	ret = memcmp(adev->vram_ptr + size - 10, cptr, 10);
+	if (ret)
+		return ret;
+
+	amdgpu_bo_free_kernel(&adev->vram_bo, &adev->vram_gpu,
+			&adev->vram_ptr);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index 82ec665b366c..f06af61378ef 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -343,4 +343,5 @@ void amdgpu_gmc_init_pdb0(struct amdgpu_device *adev);
 uint64_t amdgpu_gmc_vram_mc2pa(struct amdgpu_device *adev, uint64_t mc_addr);
 uint64_t amdgpu_gmc_vram_pa(struct amdgpu_device *adev, struct amdgpu_bo *bo);
 uint64_t amdgpu_gmc_vram_cpu_pa(struct amdgpu_device *adev, struct amdgpu_bo *bo);
+int amdgpu_gmc_vram_checking(struct amdgpu_device *adev);
 #endif
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 3915ba837596..5e407c88c8d0 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -1048,6 +1048,10 @@ static int gmc_v10_0_hw_init(void *handle)
 	if (r)
 		return r;
 
+	r = amdgpu_gmc_vram_checking(adev);
+	if (r)
+		return r;
+
 	if (adev->umc.funcs && adev->umc.funcs->init_registers)
 		adev->umc.funcs->init_registers(adev);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index 9a3fc0926903..6c94a9712a3a 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -1241,7 +1241,11 @@ static int gmc_v8_0_hw_init(void *handle)
 	if (r)
 		return r;
 
-	return r;
+	r = amdgpu_gmc_vram_checking(adev);
+	if (r)
+		return r;
+
+	return 0;
 }
 
 static int gmc_v8_0_hw_fini(void *handle)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index ce7d438eeabe..1ea18b4ff63f 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1771,8 +1771,14 @@ static int gmc_v9_0_hw_init(void *handle)
 		adev->umc.funcs->init_registers(adev);
 
 	r = gmc_v9_0_gart_enable(adev);
+	if (r)
+		return r;
 
-	return r;
+	r = amdgpu_gmc_vram_checking(adev);
+	if (r)
+		return r;
+
+	return 0;
 }
 
 /**
-- 
2.25.1