gpu: nvgpu: use own usermode gpfifo object

Add usermode_gpfifo member to channel to store the usermode-owned buffer
data. This makes it more explicit about which (user or kernel) memory is
accessed.

Jira NVGPU-967

Change-Id: I98e4f4568f04aa31e00e497794fadd4997ba8aab
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1807503
Reviewed-by: svc-misra-checker <svc-misra-checker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/common/fifo/submit.c b/drivers/gpu/nvgpu/common/fifo/submit.c
index e0f31233..56512894 100644
--- a/drivers/gpu/nvgpu/common/fifo/submit.c
+++ b/drivers/gpu/nvgpu/common/fifo/submit.c
@@ -341,14 +341,14 @@ static int nvgpu_submit_channel_gpfifo(struct channel_gk20a *c,
                 return -ETIMEDOUT;
         }
 
-        if (!nvgpu_mem_is_valid(&c->gpfifo.mem)) {
-                return -ENOMEM;
-        }
-
         if (c->usermode_submit_enabled) {
                 return -EINVAL;
         }
 
+        if (!nvgpu_mem_is_valid(&c->gpfifo.mem)) {
+                return -ENOMEM;
+        }
+
         /* 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