diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 77e729d4e4f0..fa5702c5da42 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -635,6 +635,19 @@ render_ring_add_request(struct intel_ring_buffer *ring, return 0; } +static u32 +gen6_ring_get_seqno(struct intel_ring_buffer *ring) +{ + struct drm_device *dev = ring->dev; + + /* Workaround to force correct ordering between irq and seqno writes on + * ivb (and maybe also on snb) by reading from a CS register (like + * ACTHD) before reading the status page. */ + if (IS_GEN7(dev)) + intel_ring_get_active_head(ring); + return intel_read_status_page(ring, I915_GEM_HWS_INDEX); +} + static u32 ring_get_seqno(struct intel_ring_buffer *ring) { @@ -811,6 +824,12 @@ gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag) if (!dev->irq_enabled) return false; + /* It looks like we need to prevent the gt from suspending while waiting + * for an notifiy irq, otherwise irqs seem to get lost on at least the + * blt/bsd rings on ivb. */ + if (IS_GEN7(dev)) + gen6_gt_force_wake_get(dev_priv); + spin_lock(&ring->irq_lock); if (ring->irq_refcount++ == 0) { ring->irq_mask &= ~rflag; @@ -835,6 +854,9 @@ gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag) ironlake_disable_irq(dev_priv, gflag); } spin_unlock(&ring->irq_lock); + + if (IS_GEN7(dev)) + gen6_gt_force_wake_put(dev_priv); } static bool @@ -1341,7 +1363,7 @@ static const struct intel_ring_buffer gen6_bsd_ring = { .write_tail = gen6_bsd_ring_write_tail, .flush = gen6_ring_flush, .add_request = gen6_add_request, - .get_seqno = ring_get_seqno, + .get_seqno = gen6_ring_get_seqno, .irq_get = gen6_bsd_ring_get_irq, .irq_put = gen6_bsd_ring_put_irq, .dispatch_execbuffer = gen6_ring_dispatch_execbuffer, @@ -1476,7 +1498,7 @@ static const struct intel_ring_buffer gen6_blt_ring = { .write_tail = ring_write_tail, .flush = blt_ring_flush, .add_request = gen6_add_request, - .get_seqno = ring_get_seqno, + .get_seqno = gen6_ring_get_seqno, .irq_get = blt_ring_get_irq, .irq_put = blt_ring_put_irq, .dispatch_execbuffer = gen6_ring_dispatch_execbuffer, @@ -1499,6 +1521,7 @@ int intel_init_render_ring_buffer(struct drm_device *dev) ring->flush = gen6_render_ring_flush; ring->irq_get = gen6_render_ring_get_irq; ring->irq_put = gen6_render_ring_put_irq; + ring->get_seqno = gen6_ring_get_seqno; } else if (IS_GEN5(dev)) { ring->add_request = pc_render_add_request; ring->get_seqno = pc_render_get_seqno;