gpu: nvgpu: Add sysfs nodes for timeslice min/max

The timeslice values that can be selected for a particular channel/tsg
are bounded by a static min/max. This change introduces two sysfs
nodes that allow these bounds to be configured from userspace.

min_timeslice_us
max_timeslice_us

Bug 200251974
Bug 1854791

Change-Id: I5d5a14225eee4090e418c7e43629324114f60768
Signed-off-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-on: http://git-master/r/1280372
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 40d6d91c..6cbbdeb0 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -44,9 +44,6 @@
 
 #define NVMAP_HANDLE_PARAM_SIZE 1
 
-#define NVGPU_CHANNEL_MIN_TIMESLICE_US 1000
-#define NVGPU_CHANNEL_MAX_TIMESLICE_US 50000
-
 /*
  * Although channels do have pointers back to the gk20a struct that they were
  * created under in cases where the driver is killed that pointer can be bad.
@@ -3345,14 +3342,16 @@ int gk20a_channel_set_priority(struct channel_gk20a *ch, u32 priority)
 
 int gk20a_channel_set_timeslice(struct channel_gk20a *ch, u32 timeslice)
 {
+        struct gk20a *g = ch->g;
+
         if (gk20a_is_channel_marked_as_tsg(ch)) {
                 gk20a_err(dev_from_gk20a(ch->g),
                         "invalid operation for TSG!\n");
                 return -EINVAL;
         }
 
-        if (timeslice < NVGPU_CHANNEL_MIN_TIMESLICE_US ||
-                timeslice > NVGPU_CHANNEL_MAX_TIMESLICE_US)
+        if (timeslice < g->min_timeslice_us ||
+                timeslice > g->max_timeslice_us)
                 return -EINVAL;
 
         ch->timeslice_us = timeslice;