In order for the missed-irq update to take effect, the device must be
idle. So when the user updates the fault injection via debugfs, idle the
device.
Testcase: igt/drv_missed_irq
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 29 ++++++++++++++++++++++++-----
1 file changed, 24 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 4a3e5b9552f8..9b769ee231e9 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4151,16 +4151,35 @@ i915_ring_missed_irq_set(void *data, u64 val)
{
struct drm_i915_private *dev_priv = data;
struct drm_device *dev = &dev_priv->drm;
- int ret;
+ int err;
+
+ err = mutex_lock_interruptible(&dev->struct_mutex);
+ if (err)
+ return err;
+
+ err = i915_gem_wait_for_idle(dev_priv,
+ I915_WAIT_LOCKED |
+ I915_WAIT_INTERRUPTIBLE);
+ if (err)
+ goto err_unlock;
+
+ /* Retire to kick idle work */
+ i915_gem_retire_requests(dev_priv);
+ GEM_BUG_ON(dev_priv->gt.active_requests);
- /* Lock against concurrent debugfs callers */
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret)
- return ret;
dev_priv->gpu_error.missed_irq_rings = val;
mutex_unlock(&dev->struct_mutex);
+ /* Flush idle worker to disarm irq */
+ while (flush_delayed_work(&dev_priv->gt.idle_work))
+ ;
+
+
return 0;
+
+err_unlock:
+ mutex_unlock(&dev->struct_mutex);
+ return err;
}
DEFINE_SIMPLE_ATTRIBUTE(i915_ring_missed_irq_fops,
--
2.11.0
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