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drm/i915: Pull sync_scru for device reset outside of wedge_mutex

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We need to flush our srcu protecting resources about to be clobbered
by the reset, inside of our timer failsafe but outside of the
error->wedge_mutex, so that the failsafe can run in case the
synchronize_srcu() takes too long (hits a shrinker deadlock?).

Fixes: 72eb16df010a ("drm/i915: Serialise resets with wedging")
References: https://bugs.freedesktop.org/show_bug.cgi?id=109605
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190211135040.1234-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2019-02-11 13:50:39 +00:00
parent a0f52c3d35
commit 785fbda5ba
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/i915_reset.c
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@ -941,9 +941,6 @@ static int do_reset(struct drm_i915_private *i915, unsigned int stalled_mask)
{
int err, i;
/* Flush everyone currently using a resource about to be clobbered */
synchronize_srcu(&i915->gpu_error.reset_backoff_srcu);
err = intel_gpu_reset(i915, ALL_ENGINES);
for (i = 0; err && i < RESET_MAX_RETRIES; i++) {
msleep(10 * (i + 1));
@ -1140,6 +1137,9 @@ static void i915_reset_device(struct drm_i915_private *i915,
i915_wedge_on_timeout(&w, i915, 5 * HZ) {
intel_prepare_reset(i915);
/* Flush everyone using a resource about to be clobbered */
synchronize_srcu(&error->reset_backoff_srcu);
mutex_lock(&error->wedge_mutex);
i915_reset(i915, engine_mask, reason);
mutex_unlock(&error->wedge_mutex);