gpu: nvgpu: use mem_desc in priv_cmd_entry

Replace the plain cpu pointer accesses with gk20a_mem_wr32(), and use a
reference to the underlying mem_desc (within priv_cmd_queue) paired with
an offset, for buffer aperture flexibility.

JIRA DNVGPU-21
JIRA DNVGPU-23

Change-Id: I317672c94bb682bb895f9ed3e8116729c8bb7f4b
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1145922
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index e9ac8f18..d943b231 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -164,7 +164,8 @@ struct priv_cmd_queue {
 };
 
 struct priv_cmd_entry {
-        u32 *ptr;
+        struct mem_desc *mem;
+        u32 off;        /* offset in mem, in u32 entries */
         u64 gva;
         u32 get;        /* start of entry in queue */
         u32 size;       /* in words */