drm/i915: Use a global lock for modifying global irq flags
We were attempting to use a per-ring spinlock whilst modifying global
IRQ flags. A recipe for rare missed interrupts.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f797613..b7f446e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -610,17 +610,18 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
if (!dev->irq_enabled)
return false;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (ring->irq_refcount++ == 0) {
dev_priv->gt_irq_mask &= ~ring->irq_enable_mask;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
POSTING_READ(GTIMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
return true;
}
@@ -630,14 +631,15 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (--ring->irq_refcount == 0) {
dev_priv->gt_irq_mask |= ring->irq_enable_mask;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
POSTING_READ(GTIMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
}
static bool
@@ -645,17 +647,18 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
if (!dev->irq_enabled)
return false;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (ring->irq_refcount++ == 0) {
dev_priv->irq_mask &= ~ring->irq_enable_mask;
I915_WRITE(IMR, dev_priv->irq_mask);
POSTING_READ(IMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
return true;
}
@@ -665,14 +668,15 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (--ring->irq_refcount == 0) {
dev_priv->irq_mask |= ring->irq_enable_mask;
I915_WRITE(IMR, dev_priv->irq_mask);
POSTING_READ(IMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
}
static bool
@@ -680,17 +684,18 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
if (!dev->irq_enabled)
return false;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (ring->irq_refcount++ == 0) {
dev_priv->irq_mask &= ~ring->irq_enable_mask;
I915_WRITE16(IMR, dev_priv->irq_mask);
POSTING_READ16(IMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
return true;
}
@@ -700,14 +705,15 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (--ring->irq_refcount == 0) {
dev_priv->irq_mask |= ring->irq_enable_mask;
I915_WRITE16(IMR, dev_priv->irq_mask);
POSTING_READ16(IMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
}
void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
@@ -786,6 +792,7 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
if (!dev->irq_enabled)
return false;
@@ -795,14 +802,14 @@
* blt/bsd rings on ivb. */
gen6_gt_force_wake_get(dev_priv);
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (ring->irq_refcount++ == 0) {
I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
dev_priv->gt_irq_mask &= ~ring->irq_enable_mask;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
POSTING_READ(GTIMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
return true;
}
@@ -812,15 +819,16 @@
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;
- spin_lock(&ring->irq_lock);
+ spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (--ring->irq_refcount == 0) {
I915_WRITE_IMR(ring, ~0);
dev_priv->gt_irq_mask |= ring->irq_enable_mask;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
POSTING_READ(GTIMR);
}
- spin_unlock(&ring->irq_lock);
+ spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
gen6_gt_force_wake_put(dev_priv);
}
@@ -954,7 +962,6 @@
ring->size = 32 * PAGE_SIZE;
init_waitqueue_head(&ring->irq_queue);
- spin_lock_init(&ring->irq_lock);
if (I915_NEED_GFX_HWS(dev)) {
ret = init_status_page(ring);