From: Chris Wilson Date: Wed, 15 Feb 2012 11:25:36 +0000 (+0000) Subject: drm/i915: Record the tail at each request and use it to estimate the head X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a71d8d94525e8fd855c0466fb586ae1cb008f3a2;p=linux-beck.git drm/i915: Record the tail at each request and use it to estimate the head By recording the location of every request in the ringbuffer, we know that in order to retire the request the GPU must have finished reading it and so the GPU head is now beyond the tail of the request. We can therefore provide a conservative estimate of where the GPU is reading from in order to avoid having to read back the ring buffer registers when polling for space upon starting a new write into the ringbuffer. A secondary effect is that this allows us to convert intel_ring_buffer_wait() to use i915_wait_request() and so consolidate upon the single function to handle the complicated task of waiting upon the GPU. A necessary precaution is that we need to make that wait uninterruptible to match the existing conditions as all the callers of intel_ring_begin() have not been audited to handle ERESTARTSYS correctly. By using a conservative estimate for the head, and always processing all outstanding requests first, we prevent a race condition between using the estimate and direct reads of I915_RING_HEAD which could result in the value of the head going backwards, and the tail overflowing once again. We are also careful to mark any request that we skip over in order to free space in ring as consumed which provides a self-consistency check. Given sufficient abuse, such as a set of unthrottled GPU bound cairo-traces, avoiding the use of I915_RING_HEAD gives a 10-20% boost on Sandy Bridge (i5-2520m): firefox-paintball 18927ms -> 15646ms: 1.21x speedup firefox-fishtank 12563ms -> 11278ms: 1.11x speedup which is a mild consolation for the performance those traces achieved from exploiting the buggy autoreported head. v2: Add a few more comments and make request->tail a conservative estimate as suggested by Daniel Vetter. Signed-off-by: Chris Wilson [danvet: resolve conflicts with retirement defering and the lack of the autoreport head removal (that will go in through -fixes).] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 8e3eb5e282a1..0e4c073fae49 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 2031cc7eaa3a..19a06c280b12 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 e784ebb8cc27..ca3972f2c6f5 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 c8b9cc0cd0dc..bc0365b8fa4d 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))