gpu: nvgpu: add refcounting for MMU debug mode

GPC MMU debug mode should be set if at least one channel
in the TSG has requested it. Add refcounting for MMU debug
mode, to make sure debug mode is disabled only when no
channel in the TSG is using it.

Bug 2515097
Bug 2713590

Change-Id: Ic5530f93523a9ec2cd3bfebc97adf7b7000531e0
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2123017
(cherry picked from commit a1248d87fe6e20aab3e5f2e0764f9fe8d80d0552)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2208769
Reviewed-by: Kajetan Dutka <kdutka@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Winnie Hsu <whsu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: Kajetan Dutka <kdutka@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c b/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c
index f7a65f2b..408bbc64 100644
--- a/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c
+++ b/drivers/gpu/nvgpu/os/linux/ioctl_dbg.c
@@ -1107,10 +1107,11 @@ static int nvgpu_dbg_gpu_ioctl_set_mmu_debug_mode(
         ch = nvgpu_dbg_gpu_get_session_channel(dbg_s);
         if (!ch) {
                 nvgpu_err(g, "no bound channel for mmu debug mode");
+                err = -EINVAL;
                 goto clean_up;
         }
 
-        err = g->ops.gr.set_mmu_debug_mode(g, ch, enable);
+        err = nvgpu_tsg_set_mmu_debug_mode(tsg_gk20a_from_ch(ch), ch, enable);
         if (err) {
                 nvgpu_err(g, "set mmu debug mode failed, err=%d", err);
         }