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, 13 insertions, 7 deletions

diff --git a/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c b/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
index 97ab7aab..feed2002 100644
--- a/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
+++ b/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
@@ -1049,19 +1049,25 @@ void gv11b_fifo_teardown_ch_tsg(struct gk20a *g, u32 act_eng_bitmask,
 #endif
 
         if (tsg) {
-                if (!g->fifo.deferred_reset_pending &&
-                    rc_type == RC_TYPE_MMU_FAULT)
-                        gk20a_fifo_set_ctx_mmu_error_tsg(g, tsg);
+                if (g->fifo.deferred_reset_pending) {
+                        gk20a_disable_tsg(tsg);
+                } else {
+                        if (rc_type == RC_TYPE_MMU_FAULT)
+                                gk20a_fifo_set_ctx_mmu_error_tsg(g, tsg);
 
-                gk20a_fifo_abort_tsg(g, tsg->tsgid, false);
+                        gk20a_fifo_abort_tsg(g, tsg->tsgid, false);
+                }
                 if (refch)
                         gk20a_channel_put(refch);
         } else if (refch) {
-                if (!g->fifo.deferred_reset_pending &&
-                    rc_type == RC_TYPE_MMU_FAULT)
+                if (g->fifo.deferred_reset_pending) {
+                        g->ops.fifo.disable_channel(refch);
+                } else {
+                        if (rc_type == RC_TYPE_MMU_FAULT)
                                 gk20a_fifo_set_ctx_mmu_error_ch(g, refch);
 
-                gk20a_channel_abort(refch, false);
+                        gk20a_channel_abort(refch, false);
+                }
                 gk20a_channel_put(refch);
         } else {
                 nvgpu_err(g, "id unknown, abort runlist");