gpu: nvgpu: add TSG timeslice support

Add support for changing a TSG's timeslice, within reasonable
limits imposed by the kernel driver.

JIRA VFND-1494
Bug 1749744

Change-Id: Ifca1b63a00da7a5872483bb56692da70a5f18bdf
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/1129837
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c b/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
index 0eaa23ab..40c871ce 100644
--- a/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
@@ -25,6 +25,9 @@
 #include "gk20a.h"
 #include "hw_ccsr_gk20a.h"
 
+#define NVGPU_TSG_MIN_TIMESLICE_US 1000
+#define NVGPU_TSG_MAX_TIMESLICE_US 50000
+
 static void gk20a_tsg_release(struct kref *ref);
 
 bool gk20a_is_channel_marked_as_tsg(struct channel_gk20a *ch)
@@ -345,6 +348,20 @@ static int gk20a_tsg_set_runlist_interleave(struct tsg_gk20a *tsg, u32 level)
         return ret ? ret : g->ops.fifo.update_runlist(g, 0, ~0, true, true);
 }
 
+static 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)
+                return -EINVAL;
+
+        gk20a_channel_get_timescale_from_timeslice(g, timeslice,
+                        &tsg->timeslice_timeout, &tsg->timeslice_scale);
+
+        return g->ops.fifo.update_runlist(g, 0, ~0, true, true);
+}
+
 static void release_used_tsg(struct fifo_gk20a *f, struct tsg_gk20a *tsg)
 {
         mutex_lock(&f->tsg_inuse_mutex);
@@ -554,6 +571,20 @@ long gk20a_tsg_dev_ioctl(struct file *filp, unsigned int cmd,
                 break;
                 }
 
+        case NVGPU_IOCTL_TSG_SET_TIMESLICE:
+                {
+                err = gk20a_busy(g->dev);
+                if (err) {
+                        gk20a_err(dev_from_gk20a(g),
+                           "failed to host gk20a for ioctl cmd: 0x%x", cmd);
+                        return err;
+                }
+                err = gk20a_tsg_set_timeslice(tsg,
+                        ((struct nvgpu_timeslice_args *)buf)->timeslice_us);
+                gk20a_idle(g->dev);
+                break;
+                }
+
         default:
                 gk20a_err(dev_from_gk20a(g),
                            "unrecognized tsg gpu ioctl cmd: 0x%x",