gpu: nvgpu: reject submits when usermode is on

Kernel mode submits conflict with user submits, so don't allow them if a
channel user has asked for usermode submit support.

Bug 200145225

Change-Id: I3a99222b09260a1b3e116c6aa86d8da5d380d903
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1767907
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/fifo/submit.c b/drivers/gpu/nvgpu/common/fifo/submit.c
index daeee608..f6a79f80 100644
--- a/drivers/gpu/nvgpu/common/fifo/submit.c
+++ b/drivers/gpu/nvgpu/common/fifo/submit.c
@@ -322,6 +322,9 @@ static int nvgpu_submit_channel_gpfifo(struct channel_gk20a *c,
         if (!nvgpu_mem_is_valid(&c->gpfifo.mem))
                 return -ENOMEM;
 
+        if (c->usermode_submit_enabled)
+                return -EINVAL;
+
         /* fifo not large enough for request. Return error immediately.
          * Kernel can insert gpfifo entries before and after user gpfifos.
          * So, add extra_entries in user request. Also, HW with fifo size N