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, 3 insertions, 6 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c b/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
index 3b2cca0d..81a4b78e 100644
--- a/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2016, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2017, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -26,9 +26,6 @@
 
 #include <nvgpu/hw/gk20a/hw_ccsr_gk20a.h>
 
-#define NVGPU_TSG_MIN_TIMESLICE_US 1000
-#define NVGPU_TSG_MAX_TIMESLICE_US 50000
-
 struct tsg_private {
         struct gk20a *g;
         struct tsg_gk20a *tsg;
@@ -367,8 +364,8 @@ int gk20a_tsg_set_timeslice(struct tsg_gk20a *tsg, u32 timeslice)
 {
         struct gk20a *g = tsg->g;
 
-        if (timeslice < NVGPU_TSG_MIN_TIMESLICE_US ||
-                timeslice > NVGPU_TSG_MAX_TIMESLICE_US)
+        if (timeslice < g->min_timeslice_us ||
+                timeslice > g->max_timeslice_us)
                 return -EINVAL;
 
         gk20a_channel_get_timescale_from_timeslice(g, timeslice,