gpu: nvgpu: in-kernel kickoff profiling

Add a debugfs interface to profile the kickoff ioctl
it provides the probability distribution and separates the information
between time spent in: the full ioctl, the kickoff function, the amount
of time spent in job tracking and the amount of time doing pushbuffer
copies

JIRA: EVLR-1003

Change-Id: I9888b114c3fbced61b1cf134c79f7a8afce15f56
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: http://git-master/r/1308997
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 27 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 68e43259..f58b208c 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -2987,7 +2987,8 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
                                 u32 flags,
                                 struct nvgpu_fence *fence,
                                 struct gk20a_fence **fence_out,
-                                bool force_need_sync_fence)
+                                bool force_need_sync_fence,
+                                struct fifo_profile_gk20a *profile)
 {
         struct gk20a *g = c->g;
         struct device *d = dev_from_gk20a(g);
@@ -3036,6 +3037,9 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
                 return -EINVAL;
         }
 
+        if (profile)
+                profile->timestamp[PROFILE_ENTRY] = sched_clock();
+
 #ifdef CONFIG_DEBUG_FS
         /* update debug settings */
         if (g->ops.ltc.sync_debugfs)
@@ -3162,6 +3166,9 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
                         goto clean_up_job;
         }
 
+        if (profile)
+                profile->timestamp[PROFILE_JOB_TRACKING] = sched_clock();
+
         if (wait_cmd)
                 gk20a_submit_append_priv_cmdbuf(c, wait_cmd);
 
@@ -3184,6 +3191,8 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
         if (need_job_tracking)
                 /* TODO! Check for errors... */
                 gk20a_channel_add_job(c, job, skip_buffer_refcounting);
+        if (profile)
+                profile->timestamp[PROFILE_APPEND] = sched_clock();
 
         g->ops.fifo.userd_gp_put(g, c);
 
@@ -3197,6 +3206,8 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
         gk20a_dbg_info("post-submit put %d, get %d, size %d",
                 c->gpfifo.put, c->gpfifo.get, c->gpfifo.entry_num);
 
+        if (profile)
+                profile->timestamp[PROFILE_END] = sched_clock();
         gk20a_dbg_fn("done");
         return err;
 
@@ -3789,15 +3800,22 @@ static int gk20a_ioctl_channel_submit_gpfifo(
         struct nvgpu_submit_gpfifo_args *args)
 {
         struct gk20a_fence *fence_out;
+        struct fifo_profile_gk20a *profile = NULL;
+
         int ret = 0;
         gk20a_dbg_fn("");
 
+#ifdef CONFIG_DEBUG_FS
+        profile = gk20a_fifo_profile_acquire(ch->g);
+
+        if (profile)
+                profile->timestamp[PROFILE_IOCTL_ENTRY] = sched_clock();
+#endif
         if (ch->has_timedout)
                 return -ETIMEDOUT;
-
         ret = gk20a_submit_channel_gpfifo(ch, NULL, args, args->num_entries,
                                           args->flags, &args->fence,
-                                          &fence_out, false);
+                                          &fence_out, false, profile);
 
         if (ret)
                 goto clean_up;
@@ -3816,7 +3834,12 @@ static int gk20a_ioctl_channel_submit_gpfifo(
                 }
         }
         gk20a_fence_put(fence_out);
-
+#ifdef CONFIG_DEBUG_FS
+        if (profile) {
+                profile->timestamp[PROFILE_IOCTL_EXIT] = sched_clock();
+                gk20a_fifo_profile_release(ch->g, profile);
+        }
+#endif
 clean_up:
         return ret;
 }