gpu: nvgpu: add support to set channel timeslice

As part of improving GPU scheduling, userspace can now set a
channel's timeslice, within reasonable limits imposed by the
kernel driver.

JIRA VFND-1312
Bug 1729664

Change-Id: I4c3430c43437889b8685f12988d4b967bb7877bb
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/1020917
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 68c1c4e0..0c8de87f 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -880,6 +880,12 @@ struct nvgpu_runlist_interleave_args {
 #define NVGPU_RUNLIST_INTERLEAVE_LEVEL_HIGH     2
 #define NVGPU_RUNLIST_INTERLEAVE_NUM_LEVELS     3
 
+/* controls how long a channel occupies an engine uninterrupted */
+struct nvgpu_timeslice_args {
+        __u32 timeslice_us;
+        __u32 reserved;
+};
+
 #define NVGPU_IOCTL_CHANNEL_SET_NVMAP_FD        \
         _IOW(NVGPU_IOCTL_MAGIC, 5, struct nvgpu_set_nvmap_fd_args)
 #define NVGPU_IOCTL_CHANNEL_SET_TIMEOUT \
@@ -924,9 +930,11 @@ struct nvgpu_runlist_interleave_args {
         _IOW(NVGPU_IOCTL_MAGIC, 119, struct nvgpu_channel_wdt_args)
 #define NVGPU_IOCTL_CHANNEL_SET_RUNLIST_INTERLEAVE \
         _IOW(NVGPU_IOCTL_MAGIC, 120, struct nvgpu_runlist_interleave_args)
+#define NVGPU_IOCTL_CHANNEL_SET_TIMESLICE \
+        _IOW(NVGPU_IOCTL_MAGIC, 121, struct nvgpu_timeslice_args)
 
 #define NVGPU_IOCTL_CHANNEL_LAST        \
-        _IOC_NR(NVGPU_IOCTL_CHANNEL_SET_RUNLIST_INTERLEAVE)
+        _IOC_NR(NVGPU_IOCTL_CHANNEL_SET_TIMESLICE)
 #define NVGPU_IOCTL_CHANNEL_MAX_ARG_SIZE sizeof(struct nvgpu_submit_gpfifo_args)
 
 /*