Re: [PATCH v4 2/2] radeon: use memcpy_to/fromio for UVD fw upload

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Am 04.06.21 um 10:43 schrieb Chen Li:
I met a gpu addr bug recently and the kernel log
tells me the pc is memcpy/memset and link register is
radeon_uvd_resume.

As we know, in some architectures, optimized memcpy/memset
may not work well on device memory. Trival memcpy_toio/memset_io
can fix this problem.

BTW, amdgpu has already done it in:
commit ba0b2275a678 ("drm/amdgpu: use memcpy_to/fromio for UVD fw upload"),
that's why it has no this issue on the same gpu and platform.

Signed-off-by: Chen Li <chenli@xxxxxxxxxxxxx>
Reviewed-by: Christian König

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

Alex will probably now pick them up for upstreaming.

Christian.

---
  drivers/gpu/drm/radeon/radeon_uvd.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 85a1f2c31749..753da95e6abb 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -288,7 +288,7 @@ int radeon_uvd_resume(struct radeon_device *rdev)
  	if (rdev->uvd.vcpu_bo == NULL)
  		return -EINVAL;
- memcpy(rdev->uvd.cpu_addr, rdev->uvd_fw->data, rdev->uvd_fw->size);
+	memcpy_toio((void __iomem *)rdev->uvd.cpu_addr, rdev->uvd_fw->data, rdev->uvd_fw->size);
size = radeon_bo_size(rdev->uvd.vcpu_bo);
  	size -= rdev->uvd_fw->size;
@@ -296,7 +296,7 @@ int radeon_uvd_resume(struct radeon_device *rdev)
  	ptr = rdev->uvd.cpu_addr;
  	ptr += rdev->uvd_fw->size;
- memset(ptr, 0, size);
+	memset_io((void __iomem *)ptr, 0, size);
return 0;
  }

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