gpu: nvgpu: add ioctls to get current timeslice

Add the following ioctls
- NVGPU_CHANNEL_IOCTL_GET_TIMESLICE for channel timeslice in us
- NVGPU_TSG_IOCTL_GET_TIMESLICE for TSG timeslice in us

If timeslice has not been set explicitly, ioctl returns the
default timeslice that will be used when programming the runlist
entry.

Bug 1883271

Change-Id: Ib18fdd836323b1a2d4efceb1e27d07713bd6fca5
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1469040
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/ioctl_channel.c b/drivers/gpu/nvgpu/common/linux/ioctl_channel.c
index 8a87e4cb..4d4d1690 100644
--- a/drivers/gpu/nvgpu/common/linux/ioctl_channel.c
+++ b/drivers/gpu/nvgpu/common/linux/ioctl_channel.c
@@ -1125,6 +1125,10 @@ long gk20a_channel_ioctl(struct file *filp,
                 gk20a_channel_trace_sched_param(
                         trace_gk20a_channel_set_timeslice, ch);
                 break;
+        case NVGPU_IOCTL_CHANNEL_GET_TIMESLICE:
+                ((struct nvgpu_timeslice_args *)buf)->timeslice_us =
+                        gk20a_channel_get_timeslice(ch);
+                break;
         case NVGPU_IOCTL_CHANNEL_SET_PREEMPTION_MODE:
                 if (ch->g->ops.gr.set_preemption_mode) {
                         err = gk20a_busy(ch->g);