gpu: nvgpu: gv11b: add max_subctx_count to g->fifo.t19x

- For better performance. It used to read register every time referencing
  max_subctx_count.
- Avoid reading registers for vgpu.

Jira VFND-3797

Change-Id: Id6e6b15a0d9a035795e8a9a2c6bb63524c5eb544
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1537009
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/ioctl_tsg_t19x.c b/drivers/gpu/nvgpu/common/linux/ioctl_tsg_t19x.c
index bf6088ab..b0b1f9c4 100644
--- a/drivers/gpu/nvgpu/common/linux/ioctl_tsg_t19x.c
+++ b/drivers/gpu/nvgpu/common/linux/ioctl_tsg_t19x.c
@@ -44,7 +44,7 @@ static int gv11b_tsg_ioctl_bind_channel_ex(struct gk20a *g,
         ch = gk20a_get_channel_from_file(arg->channel_fd);
         if (!ch)
                 return -EINVAL;
-        if (arg->subcontext_id < gv11b_get_max_subctx_count(g))
+        if (arg->subcontext_id < g->fifo.t19x.max_subctx_count)
                 ch->t19x.subctx_id = arg->subcontext_id;
         else
                 return -EINVAL;