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gpu: nvgpu: specify DMA_TO_DEVICE direction to map_attachment for RO maps

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nvgpu does map attachment with DMA_BIDIRECTIONAL direction for buffers
irrespective of the GPU mapping type. nvmap will allow map attachment
with only DMA_TO_DEVICE direction for RO buffers for secure buffer
access.

nvgpu does RO GPU mapping if the buffer is RO for CPU or user requests
to map as RO. In both cases the dma_buf map attachment should be done
with DMA_TO_DEVICE direction as the intent for accessing the SGT is
reading from GPU.

Also, map the gpfifo buffer as read_only as it is intended to be read
only. The userd buffer is accessed by the GPU through iova and is not
GMMU mapped.

Bug 200731819

Change-Id: Ifc60973f298f7cacab16c5dedecbb40c5f33ed1d
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2539312
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Sagar Kamble
2021-06-03 18:17:27 +05:30
committed by mobile promotions
parent 7e1f9b8b19
commit e099f8b1fd
5 changed files with 17 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/nvgpu/os/linux/vm.c
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@@ -15,6 +15,7 @@
*/
#include <linux/dma-buf.h>
#include <linux/dma-direction.h>
#include <linux/scatterlist.h>
#include <uapi/linux/nvgpu.h>
@@ -265,7 +266,10 @@ int nvgpu_vm_map_linux(struct vm_gk20a *vm,
return err;
}
sgt = nvgpu_mm_pin(dev, dmabuf, &attachment);
sgt = nvgpu_mm_pin(dev, dmabuf, &attachment,
(buffer_rw_mode == gk20a_mem_flag_read_only) ||
(map_access_requested == NVGPU_VM_MAP_ACCESS_READ_ONLY) ?
DMA_TO_DEVICE : DMA_BIDIRECTIONAL);
if (IS_ERR(sgt)) {
nvgpu_warn(g, "Failed to pin dma_buf!");
return PTR_ERR(sgt);