[PATCH v6 4/4] drm/i915: Use device wedged event

[Raag Jadav]

Now that we have device wedged event supported by DRM core, make use
of it. With this in place, userspace will be notified of wedged device
on gt reset failure.

Signed-off-by: Raag Jadav <raag.jadav at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_reset.c |  2 ++
 drivers/gpu/drm/i915/i915_driver.c    | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 8f1ea95471ef..02f357d4e4fb 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -1418,6 +1418,8 @@ static void intel_gt_reset_global(struct intel_gt *gt,
 
 	if (!test_bit(I915_WEDGED, &gt->reset.flags))
 		kobject_uevent_env(kobj, KOBJ_CHANGE, reset_done_event);
+	else
+		drm_dev_wedged_event(&gt->i915->drm, DRM_WEDGE_RECOVERY_BUS_RESET);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index fe905d65ddf7..0185fb41eb95 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -711,6 +711,15 @@ static void i915_welcome_messages(struct drm_i915_private *dev_priv)
 			 "DRM_I915_DEBUG_RUNTIME_PM enabled\n");
 }
 
+static void i915_setup_wedge_recovery(struct drm_i915_private *i915)
+{
+	struct drm_device *dev = &i915->drm;
+
+	/* Support both driver rebind and bus reset based recovery. */
+	set_bit(DRM_WEDGE_RECOVERY_REBIND, &dev->wedge_recovery);
+	set_bit(DRM_WEDGE_RECOVERY_BUS_RESET, &dev->wedge_recovery);
+}
+
 static struct drm_i915_private *
 i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
@@ -812,6 +821,7 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	enable_rpm_wakeref_asserts(&i915->runtime_pm);
 
+	i915_setup_wedge_recovery(i915);
 	i915_welcome_messages(i915);
 
 	i915->do_release = true;
-- 
2.34.1