linux-kernel - [PATCH] drm/i915: Mark GEM wedged right after marking device unplugged

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Message-Id: <20190405114032.5725-1-janusz.krzysztofik@linux.intel.com>
Date:   Fri,  5 Apr 2019 13:40:32 +0200
From:   Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
To:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        michal.wajdeczko@...el.com, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
Subject: [PATCH] drm/i915: Mark GEM wedged right after marking device unplugged

As soon as a device is considered unplugged, not only prevent pending
users from accessing the device structures but also cancel all their
pending requests so all consumed resources can be cleaned up as soon
as possible.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 66163378c481..03a563ce7e6b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1598,6 +1598,13 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv)
 	i915_teardown_sysfs(dev_priv);
 	drm_dev_unplug(&dev_priv->drm);
 
+	/*
+	 * After unregistering the device to prevent any new users, cancel
+	 * all in-flight requests so that we can quickly unbind the active
+	 * resources.
+	 */
+	i915_gem_set_wedged(dev_priv);
+
 	i915_gem_shrinker_unregister(dev_priv);
 }
 
-- 
2.20.1