gpu: nvgpu: Return error code properly from nvgpu_vm_map_linux

The function nvgpu_vm_map_linux() used to return GPU VA on successful
map or 0 when things didn't go smoothly. However, this scheme does not
propagate the actual map error back to the userspace.

So, modify the function a bit: return error and return the GPU VA via
pointer on success.

Bug 1705731

Change-Id: I2174b5fbaf64dcb00f9567dab1c583d6ddfa5d78
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1590961
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/linux/vm.h b/drivers/gpu/nvgpu/include/nvgpu/linux/vm.h
index 596a3b62..d810f95f 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/linux/vm.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/linux/vm.h
@@ -38,7 +38,7 @@ struct vm_gk20a;
 struct vm_gk20a_mapping_batch;
 struct nvgpu_vm_area;
 
-u64 nvgpu_vm_map_linux(struct vm_gk20a *vm,
+int nvgpu_vm_map_linux(struct vm_gk20a *vm,
                        struct dma_buf *dmabuf,
                        u64 offset_align,
                        u32 flags,
@@ -60,7 +60,8 @@ u64 nvgpu_vm_map_linux(struct vm_gk20a *vm,
                        int rw_flag,
                        u64 buffer_offset,
                        u64 mapping_size,
-                       struct vm_gk20a_mapping_batch *mapping_batch);
+                       struct vm_gk20a_mapping_batch *mapping_batch,
+                       u64 *gpu_va);
 
 /*
  * Notes: