drm/amdgpu: Cancel delayed work when GFXOFF is disabled

From Michel Daenzer
da3067eadcc156b742657c0694beae0a7c49d157 in linux 5.10.y/5.10.62
32bc8f8373d2d6a681c96e4b25dca60d4d1c6016 in mainline linux

diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_device.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_device.c
index b4c8715..0334eb2 100644 (file)
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_device.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_device.c
@@ -2667,12 +2667,11 @@ static void amdgpu_device_delay_enable_gfx_off(struct work_struct *work)
        struct amdgpu_device *adev =
                container_of(work, struct amdgpu_device, gfx.gfx_off_delay_work.work);
 
-       mutex_lock(&adev->gfx.gfx_off_mutex);
-       if (!adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) {
-               if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
-                       adev->gfx.gfx_off_state = true;
-       }
-       mutex_unlock(&adev->gfx.gfx_off_mutex);
+       WARN_ON_ONCE(adev->gfx.gfx_off_state);
+       WARN_ON_ONCE(adev->gfx.gfx_off_req_count);
+
+       if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
+               adev->gfx.gfx_off_state = true;
 }
 
 /**

diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_gfx.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_gfx.c
index 7e6e3a5..0ac531c 100644 (file)
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_gfx.c
@@ -558,24 +558,38 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
 
        mutex_lock(&adev->gfx.gfx_off_mutex);
 
-       if (!enable)
-               adev->gfx.gfx_off_req_count++;
-       else if (adev->gfx.gfx_off_req_count > 0)
+       if (enable) {
+               /* If the count is already 0, it means there's an imbalance bug somewhere.
+                * Note that the bug may be in a different caller than the one which triggers the
+                * WARN_ON_ONCE.
+                */
+               if (WARN_ON_ONCE(adev->gfx.gfx_off_req_count == 0))
+                       goto unlock;
+
                adev->gfx.gfx_off_req_count--;
 
-       if (enable && !adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) {
-               schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE);
-       } else if (!enable && adev->gfx.gfx_off_state) {
-               if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false)) {
-                       adev->gfx.gfx_off_state = false;
+               if (adev->gfx.gfx_off_req_count == 0 && !adev->gfx.gfx_off_state)
+                       schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE);
+       } else {
+               if (adev->gfx.gfx_off_req_count == 0) {
+                       cancel_delayed_work_sync(&adev->gfx.gfx_off_delay_work);
+
+                       if (adev->gfx.gfx_off_state &&
+                           !amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false)) {
+                               adev->gfx.gfx_off_state = false;
 
-                       if (adev->gfx.funcs->init_spm_golden) {
-                               dev_dbg(adev->dev, "GFXOFF is disabled, re-init SPM golden settings\n");
-                               amdgpu_gfx_init_spm_golden(adev);
+                               if (adev->gfx.funcs->init_spm_golden) {
+                                       dev_dbg(adev->dev,
+                                               "GFXOFF is disabled, re-init SPM golden settings\n");
+                                       amdgpu_gfx_init_spm_golden(adev);
+                               }
                        }
                }
+
+               adev->gfx.gfx_off_req_count++;
        }
 
+unlock:
        mutex_unlock(&adev->gfx.gfx_off_mutex);
 }