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Commit a6910434 authored by Daniel Vetter's avatar Daniel Vetter Committed by Chris Wilson
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drm/i915: only one interrupt per batchbuffer is not enough! 



Previously I thought that one interrupt per batchbuffer should be
enough. Now tedious benchmarking showed this to be wrong.

Therefore track whether any commands have been isssued with a future
seqno (like pipelined fencing changes or flushes). If this is the case
emit a request before issueing the batchbuffer.

Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent 8bff917c

drivers/gpu/drm/i915/i915_drv.h

+0 −3
Original line number Diff line number Diff line
@@ -293,9 +293,6 @@ typedef struct drm_i915_private { 
	unsigned int sr01, adpa, ppcr, dvob, dvoc, lvds;

	int vblank_pipe;

	int num_pipe;

	u32 flush_rings;

#define FLUSH_RENDER_RING	0x1

#define FLUSH_BSD_RING		0x2



	/* For hangcheck timer */

#define DRM_I915_HANGCHECK_PERIOD 75 /* in jiffies */

drivers/gpu/drm/i915/i915_gem.c

+16 −17
Original line number Diff line number Diff line
@@ -1470,10 +1470,13 @@ i915_gem_object_put_pages(struct drm_gem_object *obj) 
}



static uint32_t

i915_gem_next_request_seqno(struct drm_device *dev)

i915_gem_next_request_seqno(struct drm_device *dev,

			    struct intel_ring_buffer *ring)

{

	drm_i915_private_t *dev_priv = dev->dev_private;



	ring->outstanding_lazy_request = true;



	return dev_priv->next_seqno;

}
@@ -1495,7 +1498,7 @@ i915_gem_object_move_to_active(struct drm_gem_object *obj, uint32_t seqno, 


	/* Take the seqno of the next request if none is given */

	if (seqno == 0)

		seqno = i915_gem_next_request_seqno(dev);

		seqno = i915_gem_next_request_seqno(dev, ring);



	/* Move from whatever list we were on to the tail of execution. */

	spin_lock(&dev_priv->mm.active_list_lock);
@@ -2979,7 +2982,6 @@ static void 
i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj)

{

	struct drm_device		*dev = obj->dev;

	drm_i915_private_t		*dev_priv = dev->dev_private;

	struct drm_i915_gem_object	*obj_priv = to_intel_bo(obj);

	uint32_t			invalidate_domains = 0;

	uint32_t			flush_domains = 0;
@@ -3042,13 +3044,6 @@ i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj) 
		obj->pending_write_domain = obj->write_domain;

	obj->read_domains = obj->pending_read_domains;



	if (flush_domains & I915_GEM_GPU_DOMAINS) {

		if (obj_priv->ring == &dev_priv->render_ring)

			dev_priv->flush_rings |= FLUSH_RENDER_RING;

		else if (obj_priv->ring == &dev_priv->bsd_ring)

			dev_priv->flush_rings |= FLUSH_BSD_RING;

	}



	dev->invalidate_domains |= invalidate_domains;

	dev->flush_domains |= flush_domains;

#if WATCH_BUF
@@ -3762,7 +3757,6 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, 
	 */

	dev->invalidate_domains = 0;

	dev->flush_domains = 0;

	dev_priv->flush_rings = 0;



	for (i = 0; i < args->buffer_count; i++) {

		struct drm_gem_object *obj = object_list[i];
@@ -3783,12 +3777,17 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, 
		i915_gem_flush(dev,

			       dev->invalidate_domains,

			       dev->flush_domains);

		if (dev_priv->flush_rings & FLUSH_RENDER_RING)

	}



	if (dev_priv->render_ring.outstanding_lazy_request) {

		(void)i915_add_request(dev, file_priv, 0,

				       &dev_priv->render_ring);

		if (dev_priv->flush_rings & FLUSH_BSD_RING)

		dev_priv->render_ring.outstanding_lazy_request = false;

	}

	if (dev_priv->bsd_ring.outstanding_lazy_request) {

		(void)i915_add_request(dev, file_priv, 0,

				       &dev_priv->bsd_ring);

		dev_priv->bsd_ring.outstanding_lazy_request = false;

	}



	for (i = 0; i < args->buffer_count; i++) {

drivers/gpu/drm/i915/intel_ringbuffer.h

+5 −0
Original line number Diff line number Diff line
@@ -83,6 +83,11 @@ struct intel_ring_buffer { 
	 */

	struct list_head request_list;



	/**

	 * Do we have some not yet emitted requests outstanding?

	 */

	bool outstanding_lazy_request;



	wait_queue_head_t irq_queue;

	drm_local_map_t map;

};