gpu: nvgpu: vgpu: debugger interface fixes

To run CUDA apps, the following minimal changes have been
made:
- power-gating is disabled for vgpu
- regop rd/wr returns -ENOSYS

Tools (debugger/profiler) support is known to not work and
not needed at this time.

Bug 200043227

Change-Id: I923caad78450e72d310fb9290cf2849ed5460ad5
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/592878
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
index bd24e269..72998280 100644
--- a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
@@ -90,6 +90,11 @@ static int gk20a_dbg_gpu_do_dev_open(struct inode *inode,
         dbg_session->g     = g;
         dbg_session->is_profiler = is_profiler;
         dbg_session->is_pg_disabled = false;
+        /* For vgpu, all power-gating features are currently disabled
+         * in the server. Set is_pg_disable to true to reflect this
+         * on the client side. */
+        if (gk20a_gpu_is_virtual(pdev))
+                dbg_session->is_pg_disabled = true;
 
         INIT_LIST_HEAD(&dbg_session->dbg_s_list_node);
         init_waitqueue_head(&dbg_session->dbg_events.wait_queue);
@@ -492,7 +497,8 @@ static int nvgpu_ioctl_channel_reg_ops(struct dbg_session_gk20a *dbg_s,
         }
 
         /* be sure that ctx info is in place */
-        if (!gr_context_info_available(dbg_s, &g->gr)) {
+        if (!gk20a_gpu_is_virtual(dbg_s->pdev) &&
+                !gr_context_info_available(dbg_s, &g->gr)) {
                 gk20a_err(dev, "gr context data not available\n");
                 return -ENODEV;
         }