gpu: nvgpu: vgpu: Unified CSS VGPU HAL

- defined platform agnostic wrapper for mempool
  mapping and unmapping.
- used platform agnositc wrapper for device
  tree parsing.
- modified css_gr_gk20a to include special
  handling incase of rm-server

JIRA: VQRM:3699

Change-Id: I08fd26052edfa1edf45a67be57f7d27c38ad106a
Signed-off-by: Antony Clince Alex <aalex@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1733576
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c
index 764ffe1a..6fd0d330 100644
--- a/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c
@@ -453,15 +453,24 @@ static int css_gr_create_client_data(struct gk20a *g,
                         u32 perfmon_count,
                         struct gk20a_cs_snapshot_client *cur)
 {
-        memset(cur->snapshot, 0, sizeof(*cur->snapshot));
-        cur->snapshot->start = sizeof(*cur->snapshot);
-        /* we should be ensure that can fit all fifo entries here */
-        cur->snapshot->end =
-                CSS_FIFO_ENTRY_CAPACITY(cur->snapshot_size)
-                        * sizeof(struct gk20a_cs_snapshot_fifo_entry)
-                        + sizeof(struct gk20a_cs_snapshot_fifo);
-        cur->snapshot->get = cur->snapshot->start;
-        cur->snapshot->put = cur->snapshot->start;
+        /*
+         * Special handling in-case of rm-server
+         *
+         * client snapshot buffer will not be mapped
+         * in-case of rm-server its only mapped in
+         * guest side
+         */
+        if (cur->snapshot) {
+                memset(cur->snapshot, 0, sizeof(*cur->snapshot));
+                cur->snapshot->start = sizeof(*cur->snapshot);
+                /* we should be ensure that can fit all fifo entries here */
+                cur->snapshot->end =
+                        CSS_FIFO_ENTRY_CAPACITY(cur->snapshot_size)
+                                * sizeof(struct gk20a_cs_snapshot_fifo_entry)
+                                + sizeof(struct gk20a_cs_snapshot_fifo);
+                cur->snapshot->get = cur->snapshot->start;
+                cur->snapshot->put = cur->snapshot->start;
+        }
 
         cur->perfmon_count = perfmon_count;