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Commit b13c2b96 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915/ringbuffer: Make IRQ refcnting atomic 



In order to enforce the correct memory barriers for irq get/put, we need
to perform the actual counting using atomic operations.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent 8d5203ca

drivers/gpu/drm/i915/i915_gem.c

+20 −17
Original line number Diff line number Diff line
@@ -2000,7 +2000,8 @@ i915_do_wait_request(struct drm_device *dev, uint32_t seqno, 
		trace_i915_gem_request_wait_begin(dev, seqno);



		ring->waiting_seqno = seqno;

		ring->irq_get(ring);

		ret = -ENODEV;

		if (ring->irq_get(ring)) {

			if (interruptible)

				ret = wait_event_interruptible(ring->irq_queue,

							       i915_seqno_passed(ring->get_seqno(ring), seqno)
@@ -2011,6 +2012,7 @@ i915_do_wait_request(struct drm_device *dev, uint32_t seqno, 
					   || atomic_read(&dev_priv->mm.wedged));



			ring->irq_put(ring);

		}

		ring->waiting_seqno = 0;



		trace_i915_gem_request_wait_end(dev, seqno);
@@ -3157,7 +3159,7 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file) 
		 * generation is designed to be run atomically and so is

		 * lockless.

		 */

		ring->irq_get(ring);

		if (ring->irq_get(ring)) {

			ret = wait_event_interruptible(ring->irq_queue,

						       i915_seqno_passed(ring->get_seqno(ring), seqno)

						       || atomic_read(&dev_priv->mm.wedged));
@@ -3166,6 +3168,7 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file) 
			if (ret == 0 && atomic_read(&dev_priv->mm.wedged))

				ret = -EIO;

		}

	}



	if (ret == 0)

		queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);

drivers/gpu/drm/i915/i915_irq.c

+9 −8
Original line number Diff line number Diff line
@@ -1186,9 +1186,8 @@ void i915_trace_irq_get(struct drm_device *dev, u32 seqno) 
	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

	struct intel_ring_buffer *ring = LP_RING(dev_priv);



	if (dev_priv->trace_irq_seqno == 0)

		ring->irq_get(ring);



	if (dev_priv->trace_irq_seqno == 0 &&

	    ring->irq_get(ring))

		dev_priv->trace_irq_seqno = seqno;

}
@@ -1211,10 +1210,12 @@ static int i915_wait_irq(struct drm_device * dev, int irq_nr) 
	if (master_priv->sarea_priv)

		master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;



	ring->irq_get(ring);

	ret = -ENODEV;

	if (ring->irq_get(ring)) {

		DRM_WAIT_ON(ret, ring->irq_queue, 3 * DRM_HZ,

			    READ_BREADCRUMB(dev_priv) >= irq_nr);

		ring->irq_put(ring);

	}



	if (ret == -EBUSY) {

		DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",

drivers/gpu/drm/i915/intel_ringbuffer.c

+25 −19
Original line number Diff line number Diff line
@@ -327,25 +327,28 @@ ring_get_seqno(struct intel_ring_buffer *ring) 
	return intel_read_status_page(ring, I915_GEM_HWS_INDEX);

}



static void

static bool

render_ring_get_irq(struct intel_ring_buffer *ring)

{

	struct drm_device *dev = ring->dev;



	if (dev->irq_enabled && ++ring->irq_refcount == 1) {

	if (!dev->irq_enabled)

		return false;



	if (atomic_inc_return(&ring->irq_refcount) == 1) {

		drm_i915_private_t *dev_priv = dev->dev_private;

		unsigned long irqflags;



		spin_lock_irqsave(&dev_priv->irq_lock, irqflags);



		if (HAS_PCH_SPLIT(dev))

			ironlake_enable_graphics_irq(dev_priv,

						     GT_USER_INTERRUPT);

		else

			i915_enable_irq(dev_priv, I915_USER_INTERRUPT);



		spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);

	}



	return true;

}



static void
@@ -353,8 +356,7 @@ render_ring_put_irq(struct intel_ring_buffer *ring) 
{

	struct drm_device *dev = ring->dev;



	BUG_ON(dev->irq_enabled && ring->irq_refcount == 0);

	if (dev->irq_enabled && --ring->irq_refcount == 0) {

	if (atomic_dec_and_test(&ring->irq_refcount)) {

		drm_i915_private_t *dev_priv = dev->dev_private;

		unsigned long irqflags;
@@ -417,12 +419,15 @@ ring_add_request(struct intel_ring_buffer *ring, 
	return 0;

}



static void

static bool

ring_get_irq(struct intel_ring_buffer *ring, u32 flag)

{

	struct drm_device *dev = ring->dev;



	if (dev->irq_enabled && ++ring->irq_refcount == 1) {

	if (!dev->irq_enabled)

	       return false;



	if (atomic_inc_return(&ring->irq_refcount) == 1) {

		drm_i915_private_t *dev_priv = dev->dev_private;

		unsigned long irqflags;
@@ -430,6 +435,8 @@ ring_get_irq(struct intel_ring_buffer *ring, u32 flag) 
		ironlake_enable_graphics_irq(dev_priv, flag);

		spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);

	}



	return true;

}



static void
@@ -437,7 +444,7 @@ ring_put_irq(struct intel_ring_buffer *ring, u32 flag) 
{

	struct drm_device *dev = ring->dev;



	if (dev->irq_enabled && --ring->irq_refcount == 0) {

	if (atomic_dec_and_test(&ring->irq_refcount)) {

		drm_i915_private_t *dev_priv = dev->dev_private;

		unsigned long irqflags;
@@ -447,11 +454,10 @@ ring_put_irq(struct intel_ring_buffer *ring, u32 flag) 
	}

}





static void

static bool

bsd_ring_get_irq(struct intel_ring_buffer *ring)

{

    ring_get_irq(ring, GT_BSD_USER_INTERRUPT);

	return ring_get_irq(ring, GT_BSD_USER_INTERRUPT);

}

static void

bsd_ring_put_irq(struct intel_ring_buffer *ring)
@@ -846,10 +852,10 @@ gen6_ring_dispatch_execbuffer(struct intel_ring_buffer *ring, 
       return 0;

}



static void

static bool

gen6_bsd_ring_get_irq(struct intel_ring_buffer *ring)

{

    ring_get_irq(ring, GT_GEN6_BSD_USER_INTERRUPT);

	return ring_get_irq(ring, GT_GEN6_BSD_USER_INTERRUPT);

}



static void
@@ -876,10 +882,10 @@ static const struct intel_ring_buffer gen6_bsd_ring = { 


/* Blitter support (SandyBridge+) */



static void

static bool

blt_ring_get_irq(struct intel_ring_buffer *ring)

{

    ring_get_irq(ring, GT_BLT_USER_INTERRUPT);

	return ring_get_irq(ring, GT_BLT_USER_INTERRUPT);

}



static void

drivers/gpu/drm/i915/intel_ringbuffer.h

+2 −2
Original line number Diff line number Diff line
@@ -54,8 +54,8 @@ struct intel_ring_buffer { 
	u32		irq_seqno;		/* last seq seem at irq time */

	u32		waiting_seqno;

	u32		sync_seqno[I915_NUM_RINGS-1];

	u32		irq_refcount;

	void		(*irq_get)(struct intel_ring_buffer *ring);

	atomic_t	irq_refcount;

	bool __must_check (*irq_get)(struct intel_ring_buffer *ring);

	void		(*irq_put)(struct intel_ring_buffer *ring);



	int		(*init)(struct intel_ring_buffer *ring);