gpu: nvgpu: add kernel APIs for TSG support

Add support to create/destroy TSGs using node "/dev/nvhost-tsg-gpu"

Provide below IOCTLs to bind/unbind channels to/from TSGs :

NVGPU_TSG_IOCTL_BIND_CHANNEL
NVGPU_TSG_IOCTL_UNBIND_CHANNEL

Bug 1470692

Change-Id: Iaf9f16a522379eb943906624548f8d28fc6d4486
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/416610

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 486e815c..ef7195a7 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -747,6 +747,9 @@ static struct channel_gk20a *gk20a_open_new_channel(struct gk20a *g)
         g->ops.fifo.bind_channel(ch);
         ch->pid = current->pid;
 
+        /* By default, channel is regular (non-TSG) channel */
+        ch->tsgid = NVGPU_INVALID_TSG_ID;
+
         /* reset timeout counter and update timestamp */
         ch->timeout_accumulated_ms = 0;
         ch->timeout_gpfifo_get = 0;