The if (pm_iir & ~GEN6_PM_RPS_EVENTS) check was redunandant. Otoh
adding a check for rps events allows us to avoid the spinlock grabbing
for VECS interrupts.
v2: Drop misplaced hunk which now moved to the right patch.
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/i915_irq.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0e2663c..b1185e2 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -961,25 +961,23 @@ static void dp_aux_irq_handler(struct drm_device *dev)
static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
u32 pm_iir)
{
- spin_lock(&dev_priv->rps.lock);
- dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
- if (dev_priv->rps.pm_iir) {
+ if (pm_iir & GEN6_PM_RPS_EVENTS) {
+ spin_lock(&dev_priv->rps.lock);
+ dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
/* never want to mask useful interrupts. (also posting read) */
WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS);
/* TODO: if queue_work is slow, move it out of the spinlock */
queue_work(dev_priv->wq, &dev_priv->rps.work);
+ spin_unlock(&dev_priv->rps.lock);
}
- spin_unlock(&dev_priv->rps.lock);
- if (pm_iir & ~GEN6_PM_RPS_EVENTS) {
- if (pm_iir & PM_VEBOX_USER_INTERRUPT)
- notify_ring(dev_priv->dev, &dev_priv->ring[VECS]);
+ if (pm_iir & PM_VEBOX_USER_INTERRUPT)
+ notify_ring(dev_priv->dev, &dev_priv->ring[VECS]);
- if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) {
- DRM_ERROR("VEBOX CS error interrupt 0x%08x\n", pm_iir);
- i915_handle_error(dev_priv->dev, false);
- }
+ if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) {
+ DRM_ERROR("VEBOX CS error interrupt 0x%08x\n", pm_iir);
+ i915_handle_error(dev_priv->dev, false);
}
}
--
1.8.1.4
