[PATCH 1/5] drm/i915: Use a global lock for modifying global irq flags

Ben Widawsky
2012-04-28T00:41:54Z

From: Chris Wilson <chris@chris-wilson.co.uk>

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>

Conflicts:

drivers/gpu/drm/i915/intel_ringbuffer.c
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 31 ++++++++++++++++++-------------
drivers/gpu/drm/i915/intel_ringbuffer.h | 3 +--
2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 12d9bc7..3b38157 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -613,17 +613,18 @@ gen5_ring_get_irq(struct intel_ring_buffer *ring)
{
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;
}
@@ -633,14 +634,15 @@ gen5_ring_put_irq(struct intel_ring_buffer *ring)
{
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
@@ -648,17 +650,18 @@ i9xx_ring_get_irq(struct intel_ring_buffer *ring)
{
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;
}
@@ -668,14 +671,15 @@ i9xx_ring_put_irq(struct intel_ring_buffer *ring)
{
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);
}

void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
@@ -754,6 +758,7 @@ gen6_ring_get_irq(struct intel_ring_buffer *ring)
{
struct drm_device *dev = ring->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
+ unsigned long flags;

if (!dev->irq_enabled)
return false;
@@ -763,14 +768,14 @@ gen6_ring_get_irq(struct intel_ring_buffer *ring)
* 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;
}
@@ -780,15 +785,16 @@ gen6_ring_put_irq(struct intel_ring_buffer *ring)
{
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);
}
@@ -922,7 +928,6 @@ static int intel_init_ring_buffer(struct drm_device *dev,
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);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 06a66ad..e0b25bb 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -56,8 +56,7 @@ struct intel_ring_buffer {
*/
u32 last_retired_head;

- spinlock_t irq_lock;
- u32 irq_refcount;
+ u32 irq_refcount; /* protected by dev_priv->irq_lock */
u32 irq_enable_mask; /* bitmask to enable ring interrupt */
u32 irq_seqno; /* last seq seem at irq time */
u32 trace_irq_seqno;
--
1.7.10