diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-09-04 14:12:07 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-09-04 16:01:14 +0100 |
| commit | a167b1e1319cac8894a88e9ea05a13be05b46d87 (patch) | |
| tree | e86a367f0af8fafe401c754c994d170285157ff6 /drivers/gpu/drm/i915 | |
| parent | b212f0a470eeb62a8eaa95f51b3cdbc457f687a8 (diff) | |
drm/i915: Pull intel_uncore_arm_unclaimed_mmio_detection() under the spinlock
Elsewhere we manipulate uncore.unclaimed_mmio_check and
i915_param.mmio_debug under the irq lock (e.g. preserving the current
value across a user forcewake grab), but do not protect the manipulation
inside intel_uncore_arm_unclaimed_mmio_detection() from concurrent
access, even from itself. This is an issue as we do call
arm_unclaimed_mmio_detection from multiple threads without coordination.
Suggested-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intelcom>
Link: https://patchwork.freedesktop.org/patch/msgid/20180904131207.17563-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_uncore.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 05f0cda18501..3ad302c66254 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -2283,8 +2283,12 @@ bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv) bool intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv) { + bool ret = false; + + spin_lock_irq(&dev_priv->uncore.lock); + if (unlikely(dev_priv->uncore.unclaimed_mmio_check <= 0)) - return false; + goto out; if (unlikely(intel_uncore_unclaimed_mmio(dev_priv))) { if (!i915_modparams.mmio_debug) { @@ -2294,10 +2298,13 @@ intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv) i915_modparams.mmio_debug++; } dev_priv->uncore.unclaimed_mmio_check--; - return true; + ret = true; } - return false; +out: + spin_unlock_irq(&dev_priv->uncore.lock); + + return ret; } static enum forcewake_domains |