From 608c1a526c99d1858b02d035657e28c9837667a5 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 3 Sep 2015 13:01:40 +0100 Subject: [PATCH] drm/i915: Recover all available ringbuffer space following reset Having flushed all requests from all queues, we know that all ringbuffers must now be empty. However, since we do not reclaim all space when retiring the request (to prevent HEADs colliding with rapid ringbuffer wraparound) the amount of available space on each ringbuffer upon reset is less than when we start. Do one more pass over all the ringbuffers to reset the available space Signed-off-by: Chris Wilson Reviewed-by: Mika Kuoppala Cc: Arun Siluvery Cc: Mika Kuoppala Cc: Dave Gordon --- drivers/gpu/drm/i915/i915_gem.c | 14 ++++++++++++++ drivers/gpu/drm/i915/intel_lrc.c | 1 + drivers/gpu/drm/i915/intel_ringbuffer.c | 13 ++++++++++--- drivers/gpu/drm/i915/intel_ringbuffer.h | 2 ++ 4 files changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 9b2048c..4b03dce 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2738,6 +2738,8 @@ static void i915_gem_reset_ring_status(struct drm_i915_private *dev_priv, static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv, struct intel_engine_cs *ring) { + struct intel_ringbuffer *buffer; + while (!list_empty(&ring->active_list)) { struct drm_i915_gem_object *obj; @@ -2788,6 +2790,18 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv, i915_gem_request_retire(request); } + + /* Having flushed all requests from all queues, we know that all + * ringbuffers must now be empty. However, since we do not reclaim + * all space when retiring the request (to prevent HEADs colliding + * with rapid ringbuffer wraparound) the amount of available space + * upon reset is less than when we start. Do one more pass over + * all the ringbuffers to reset last_retired_head. + */ + list_for_each_entry(buffer, &ring->buffers, link) { + buffer->last_retired_head = buffer->tail; + intel_ring_update_space(buffer); + } } void i915_gem_reset(struct drm_device *dev) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 14bdb36..fd7b8c9 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1897,6 +1897,7 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin i915_gem_batch_pool_init(dev, &ring->batch_pool); init_waitqueue_head(&ring->irq_queue); + INIT_LIST_HEAD(&ring->buffers); INIT_LIST_HEAD(&ring->execlist_queue); INIT_LIST_HEAD(&ring->execlist_retired_req_list); spin_lock_init(&ring->execlist_lock); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 69286c9..8d6d2de 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2102,10 +2102,14 @@ intel_engine_create_ringbuffer(struct intel_engine_cs *engine, int size) int ret; ring = kzalloc(sizeof(*ring), GFP_KERNEL); - if (ring == NULL) + if (ring == NULL) { + DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n", + engine->name); return ERR_PTR(-ENOMEM); + } ring->ring = engine; + list_add(&ring->link, &engine->buffers); ring->size = size; /* Workaround an erratum on the i830 which causes a hang if @@ -2121,8 +2125,9 @@ intel_engine_create_ringbuffer(struct intel_engine_cs *engine, int size) ret = intel_alloc_ringbuffer_obj(engine->dev, ring); if (ret) { - DRM_ERROR("Failed to allocate ringbuffer %s: %d\n", - engine->name, ret); + DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s: %d\n", + engine->name, ret); + list_del(&ring->link); kfree(ring); return ERR_PTR(ret); } @@ -2134,6 +2139,7 @@ void intel_ringbuffer_free(struct intel_ringbuffer *ring) { intel_destroy_ringbuffer_obj(ring); + list_del(&ring->link); kfree(ring); } @@ -2149,6 +2155,7 @@ static int intel_init_ring_buffer(struct drm_device *dev, INIT_LIST_HEAD(&ring->active_list); INIT_LIST_HEAD(&ring->request_list); INIT_LIST_HEAD(&ring->execlist_queue); + INIT_LIST_HEAD(&ring->buffers); i915_gem_batch_pool_init(dev, &ring->batch_pool); memset(ring->semaphore.sync_seqno, 0, sizeof(ring->semaphore.sync_seqno)); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 49fa41d..58b1976 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -100,6 +100,7 @@ struct intel_ringbuffer { void __iomem *virtual_start; struct intel_engine_cs *ring; + struct list_head link; u32 head; u32 tail; @@ -157,6 +158,7 @@ struct intel_engine_cs { u32 mmio_base; struct drm_device *dev; struct intel_ringbuffer *buffer; + struct list_head buffers; /* * A pool of objects to use as shadow copies of client batch buffers -- 2.7.4