openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

drm/i915: close tiny race in the ilk pcu even interrupt setup 

By the time we write DEIER in the postinstall hook the interrupt
handler could run any time. And it does modify DEIER to handle
interrupts.

Hence the DEIER read-modify-write cycle for enabling the PCU event
source is racy. Close this races the same way we handle vblank
interrupts: Unconditionally enable the interrupt in the IER register,
but conditionally mask it in IMR. The later poses no such race since
the interrupt handler does not touch DEIMR.

Also update the comment, the clearing has already happened
unconditionally above.

v2: Actually shove the updated comment into the right train^W commit,
as spotted by Paulo.

Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2013-06-27 13:44:59 +02:00
parent 4bc9d43015
commit 6005ce4243
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/i915/i915_irq.c
View File

@ -2725,7 +2725,8 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
/* should always can generate irq */
I915_WRITE(DEIIR, I915_READ(DEIIR));
I915_WRITE(DEIMR, dev_priv->irq_mask);
I915_WRITE(DEIER, display_mask | DE_PIPEA_VBLANK | DE_PIPEB_VBLANK);
I915_WRITE(DEIER, display_mask |
DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT);
POSTING_READ(DEIER);
dev_priv->gt_irq_mask = ~0;
@ -2747,11 +2748,9 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
ibx_irq_postinstall(dev);
if (IS_IRONLAKE_M(dev)) {
/* Clear & enable PCU event interrupts */
I915_WRITE(DEIIR, DE_PCU_EVENT);
I915_WRITE(DEIER, I915_READ(DEIER) | DE_PCU_EVENT);
/* spinlocking not required here for correctness since interrupt
/* Enable PCU event interrupts
*
* spinlocking not required here for correctness since interrupt
* setup is guaranteed to run in single-threaded context. But we
* need it to make the assert_spin_locked happy. */
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);