diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 17 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 83 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.h | 15 |
4 files changed, 119 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 8e3eb5e282a..0e4c073fae4 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -944,6 +944,9 @@ struct drm_i915_gem_request { /** GEM sequence number associated with this request. */ uint32_t seqno; + /** Postion in the ringbuffer of the end of the request */ + u32 tail; + /** Time at which this request was emitted, in jiffies. */ unsigned long emitted_jiffies; @@ -1213,6 +1216,8 @@ i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj) } void i915_gem_retire_requests(struct drm_device *dev); +void i915_gem_retire_requests_ring(struct intel_ring_buffer *ring); + void i915_gem_reset(struct drm_device *dev); void i915_gem_clflush_object(struct drm_i915_gem_object *obj); int __must_check i915_gem_object_set_domain(struct drm_i915_gem_object *obj, diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 2031cc7eaa3..19a06c280b1 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1605,12 +1605,20 @@ i915_add_request(struct intel_ring_buffer *ring, { drm_i915_private_t *dev_priv = ring->dev->dev_private; uint32_t seqno; + u32 request_ring_position; int was_empty; int ret; BUG_ON(request == NULL); seqno = i915_gem_next_request_seqno(ring); + /* Record the position of the start of the request so that + * should we detect the updated seqno part-way through the + * GPU processing the request, we never over-estimate the + * position of the head. + */ + request_ring_position = intel_ring_get_tail(ring); + ret = ring->add_request(ring, &seqno); if (ret) return ret; @@ -1619,6 +1627,7 @@ i915_add_request(struct intel_ring_buffer *ring, request->seqno = seqno; request->ring = ring; + request->tail = request_ring_position; request->emitted_jiffies = jiffies; was_empty = list_empty(&ring->request_list); list_add_tail(&request->list, &ring->request_list); @@ -1755,7 +1764,7 @@ void i915_gem_reset(struct drm_device *dev) /** * This function clears the request list as sequence numbers are passed. */ -static void +void i915_gem_retire_requests_ring(struct intel_ring_buffer *ring) { uint32_t seqno; @@ -1783,6 +1792,12 @@ i915_gem_retire_requests_ring(struct intel_ring_buffer *ring) break; trace_i915_gem_request_retire(ring, request->seqno); + /* We know the GPU must have read the request to have + * sent us the seqno + interrupt, so use the position + * of tail of the request to update the last known position + * of the GPU head. + */ + ring->last_retired_head = request->tail; list_del(&request->list); i915_gem_request_remove_from_client(request); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index e784ebb8cc2..ca3972f2c6f 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -583,6 +583,7 @@ pc_render_add_request(struct intel_ring_buffer *ring, PIPE_CONTROL_FLUSH(ring, scratch_addr); scratch_addr += 128; PIPE_CONTROL_FLUSH(ring, scratch_addr); + intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_WRITE_FLUSH | PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE | @@ -1107,11 +1108,89 @@ static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring) return 0; } +static int intel_ring_wait_seqno(struct intel_ring_buffer *ring, u32 seqno) +{ + struct drm_i915_private *dev_priv = ring->dev->dev_private; + bool was_interruptible; + int ret; + + /* XXX As we have not yet audited all the paths to check that + * they are ready for ERESTARTSYS from intel_ring_begin, do not + * allow us to be interruptible by a signal. + */ + was_interruptible = dev_priv->mm.interruptible; + dev_priv->mm.interruptible = false; + + ret = i915_wait_request(ring, seqno, true); + + dev_priv->mm.interruptible = was_interruptible; + + return ret; +} + +static int intel_ring_wait_request(struct intel_ring_buffer *ring, int n) +{ + struct drm_i915_gem_request *request; + u32 seqno = 0; + int ret; + + i915_gem_retire_requests_ring(ring); + + if (ring->last_retired_head != -1) { + ring->head = ring->last_retired_head; + ring->last_retired_head = -1; + ring->space = ring_space(ring); + if (ring->space >= n) + return 0; + } + + list_for_each_entry(request, &ring->request_list, list) { + int space; + + if (request->tail == -1) + continue; + + space = request->tail - (ring->tail + 8); + if (space < 0) + space += ring->size; + if (space >= n) { + seqno = request->seqno; + break; + } + + /* Consume this request in case we need more space than + * is available and so need to prevent a race between + * updating last_retired_head and direct reads of + * I915_RING_HEAD. It also provides a nice sanity check. + */ + request->tail = -1; + } + + if (seqno == 0) + return -ENOSPC; + + ret = intel_ring_wait_seqno(ring, seqno); + if (ret) + return ret; + + if (WARN_ON(ring->last_retired_head == -1)) + return -ENOSPC; + + ring->head = ring->last_retired_head; + ring->last_retired_head = -1; + ring->space = ring_space(ring); + if (WARN_ON(ring->space < n)) + return -ENOSPC; + + return 0; +} + int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; unsigned long end; + int ret; u32 head; /* If the reported head position has wrapped or hasn't advanced, @@ -1125,6 +1204,10 @@ int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n) return 0; } + ret = intel_ring_wait_request(ring, n); + if (ret != -ENOSPC) + return ret; + trace_i915_ring_wait_begin(ring); if (drm_core_check_feature(dev, DRIVER_GEM)) /* With GEM the hangcheck timer should kick us out of the loop, diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index c8b9cc0cd0d..bc0365b8fa4 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -46,6 +46,16 @@ struct intel_ring_buffer { int effective_size; struct intel_hw_status_page status_page; + /** We track the position of the requests in the ring buffer, and + * when each is retired we increment last_retired_head as the GPU + * must have finished processing the request and so we know we + * can advance the ringbuffer up to that position. + * + * last_retired_head is set to -1 after the value is consumed so + * we can detect new retirements. + */ + u32 last_retired_head; + spinlock_t irq_lock; u32 irq_refcount; u32 irq_mask; @@ -193,6 +203,11 @@ int intel_init_blt_ring_buffer(struct drm_device *dev); u32 intel_ring_get_active_head(struct intel_ring_buffer *ring); void intel_ring_setup_status_page(struct intel_ring_buffer *ring); +static inline u32 intel_ring_get_tail(struct intel_ring_buffer *ring) +{ + return ring->tail; +} + static inline void i915_trace_irq_get(struct intel_ring_buffer *ring, u32 seqno) { if (ring->trace_irq_seqno == 0 && ring->irq_get(ring)) |