gpu: nvgpu: add vidmem allocation ioctl

Add NVGPU_GPU_IOCTL_ALLOC_VIDMEM to the ctrl fd for letting userspace
allocate on-board GPU memory (aka vidmem).  The allocations are returned
as dmabuf fds.

Also, report the amount of local video memory in the gpu
characteristics.

Jira DNVGPU-19
Jira DNVGPU-38

Change-Id: I28e361d31bb630b96d06bb1c86d022d91c7592bc
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1181152
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index d7503948..5f0ce657 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -718,6 +718,8 @@ void gk20a_vm_mapping_batch_finish_locked(
         struct vm_gk20a *vm, struct vm_gk20a_mapping_batch *batch);
 
 
+int gk20a_vidmem_buf_alloc(struct gk20a *g, size_t bytes);
+
 /* Note: batch may be NULL if map op is not part of a batch */
 int gk20a_vm_map_buffer(struct vm_gk20a *vm,
                         int dmabuf_fd,