gpu: nvgpu: skip channel abort for deferred reset

In case deferred_reset_pending is set in gk20a_fifo_handle_mmu_fault() and in
gv11b_fifo_teardown_ch_tsg(), we skip resetting the engines and skip setting
the error notifier
Then we call gk20a_channel_abort()/gk20a_fifo_abort_tsg() which aborts the
channels, and resets the syncpoint values to release all the waiters

But since we don't set error notifier this could lead User to assume a
successful submission without any error

To fix this disable channel/TSG in case deferred_reset_pending is set and skip
calls to gk20a_channel_abort()/gk20a_fifo_abort_tsg()

Note that we finally abort the channel when channel is being closed

Bug 200363077

Change-Id: Ia48ca369701c14d1913d8f7b66ed466b7b840224
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1664319
(cherry picked from commit ac40d082e85397f100c3d8377b1f28811485def4)
Reviewed-on: https://git-master.nvidia.com/r/1666445
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
index fea46a0e..e12576d2 100644
--- a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
@@ -1,7 +1,7 @@
 /*
  * GK20A Graphics FIFO (gr host)
  *
- * Copyright (c) 2011-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -1647,28 +1647,32 @@ static bool gk20a_fifo_handle_mmu_fault(
                  * Disable the channel/TSG from hw and increment syncpoints.
                  */
                 if (tsg) {
-                        if (!g->fifo.deferred_reset_pending) {
+                        if (g->fifo.deferred_reset_pending) {
+                                gk20a_disable_tsg(tsg);
+                        } else {
                                 if (!fake_fault)
                                         gk20a_fifo_set_ctx_mmu_error_tsg(g,
                                                                          tsg);
                                 verbose = gk20a_fifo_error_tsg(g, tsg);
+                                gk20a_fifo_abort_tsg(g, tsg->tsgid, false);
                         }
-                        gk20a_fifo_abort_tsg(g, tsg->tsgid, false);
 
                         /* put back the ref taken early above */
                         if (refch)
                                 gk20a_channel_put(ch);
                 } else if (ch) {
                         if (refch) {
-                                if (!g->fifo.deferred_reset_pending) {
+                                if (g->fifo.deferred_reset_pending) {
+                                        g->ops.fifo.disable_channel(ch);
+                                } else {
                                         if (!fake_fault)
                                                 gk20a_fifo_set_ctx_mmu_error_ch(
                                                         g, refch);
 
                                         verbose = gk20a_fifo_error_ch(g,
                                                          refch);
+                                        gk20a_channel_abort(ch, false);
                                 }
-                                gk20a_channel_abort(ch, false);
                                 gk20a_channel_put(ch);
                         } else {
                                 nvgpu_err(g,