Re: [PATCH 2/4] drm/sched: Add callback and enable signaling on debug

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On 9/5/2022 7:16 PM, Yadav, Arvind wrote:

On 9/5/2022 4:55 PM, Christian König wrote:


Am 05.09.22 um 12:56 schrieb Arvind Yadav:
Here's on debug adding an enable_signaling callback for finished
fences and enabling software signaling for finished fence.

Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
---
  drivers/gpu/drm/scheduler/sched_fence.c | 12 ++++++++++++
  drivers/gpu/drm/scheduler/sched_main.c  |  4 +++-
  2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/scheduler/sched_fence.c b/drivers/gpu/drm/scheduler/sched_fence.c
index 7fd869520ef2..ebd26cdb79a0 100644
--- a/drivers/gpu/drm/scheduler/sched_fence.c
+++ b/drivers/gpu/drm/scheduler/sched_fence.c
@@ -122,16 +122,28 @@ static void drm_sched_fence_release_finished(struct dma_fence *f)
        dma_fence_put(&fence->scheduled);
  }
+#ifdef CONFIG_DEBUG_FS
+static bool drm_sched_enable_signaling(struct dma_fence *f)
+{
+    return true;
+}
+#endif
    static const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
      .get_driver_name = drm_sched_fence_get_driver_name,
      .get_timeline_name = drm_sched_fence_get_timeline_name,
+#ifdef CONFIG_DEBUG_FS
+    .enable_signaling = drm_sched_enable_signaling,
+#endif
      .release = drm_sched_fence_release_scheduled,
  };
    static const struct dma_fence_ops drm_sched_fence_ops_finished = {
      .get_driver_name = drm_sched_fence_get_driver_name,
      .get_timeline_name = drm_sched_fence_get_timeline_name,
+#ifdef CONFIG_DEBUG_FS
+    .enable_signaling = drm_sched_enable_signaling,
+#endif

Adding the callback should not be necessary.
sure, I will remove this change.

      .release = drm_sched_fence_release_finished,
  };
  diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index e0ab14e0fb6b..140e3d8646e2 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -961,7 +961,9 @@ static int drm_sched_main(void *param)
              s_fence->parent = dma_fence_get(fence);
              /* Drop for original kref_init of the fence */
              dma_fence_put(fence);

Uff, not related to your patch but that looks wrong to me. The reference can only be dropped after the call to dma_fence_add_callback().

Shall I take care with this patch or I will submit separate one ?

This changes was recently added by  Andrey Grodzovsky (commit : 45ecaea73) to fix the negative refcount.

-
+#ifdef CONFIG_DEBUG_FS
+ dma_fence_enable_sw_signaling(&s_fence->finished);
+#endif

This should always be called, independent of the config options set.

Christian.

sure, I will remove the Config check.

~arvind


              r = dma_fence_add_callback(fence, &sched_job->cb,
                             drm_sched_job_done_cb);
              if (r == -ENOENT)




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