diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_evict.c')
-rw-r--r-- | drivers/gpu/drm/i915/i915_gem_evict.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c new file mode 100644 index 000000000000..e85246ef691c --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -0,0 +1,276 @@ +/* + * Copyright © 2008-2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Eric Anholt <eric@anholt.net> + * Chris Wilson <chris@chris-wilson.co.uuk> + * + */ + +#include "drmP.h" +#include "drm.h" +#include "i915_drv.h" +#include "i915_drm.h" + +static struct drm_i915_gem_object * +i915_gem_next_active_object(struct drm_device *dev, + struct list_head **render_iter, + struct list_head **bsd_iter) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + struct drm_i915_gem_object *render_obj = NULL, *bsd_obj = NULL; + + if (*render_iter != &dev_priv->render_ring.active_list) + render_obj = list_entry(*render_iter, + struct drm_i915_gem_object, + list); + + if (HAS_BSD(dev)) { + if (*bsd_iter != &dev_priv->bsd_ring.active_list) + bsd_obj = list_entry(*bsd_iter, + struct drm_i915_gem_object, + list); + + if (render_obj == NULL) { + *bsd_iter = (*bsd_iter)->next; + return bsd_obj; + } + + if (bsd_obj == NULL) { + *render_iter = (*render_iter)->next; + return render_obj; + } + + /* XXX can we handle seqno wrapping? */ + if (render_obj->last_rendering_seqno < bsd_obj->last_rendering_seqno) { + *render_iter = (*render_iter)->next; + return render_obj; + } else { + *bsd_iter = (*bsd_iter)->next; + return bsd_obj; + } + } else { + *render_iter = (*render_iter)->next; + return render_obj; + } +} + +static bool +mark_free(struct drm_i915_gem_object *obj_priv, + struct list_head *unwind) +{ + list_add(&obj_priv->evict_list, unwind); + drm_gem_object_reference(&obj_priv->base); + return drm_mm_scan_add_block(obj_priv->gtt_space); +} + +#define i915_for_each_active_object(OBJ, R, B) \ + *(R) = dev_priv->render_ring.active_list.next; \ + *(B) = dev_priv->bsd_ring.active_list.next; \ + while (((OBJ) = i915_gem_next_active_object(dev, (R), (B))) != NULL) + +int +i915_gem_evict_something(struct drm_device *dev, int min_size, unsigned alignment) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + struct list_head eviction_list, unwind_list; + struct drm_i915_gem_object *obj_priv, *tmp_obj_priv; + struct list_head *render_iter, *bsd_iter; + int ret = 0; + + i915_gem_retire_requests(dev); + + /* Re-check for free space after retiring requests */ + if (drm_mm_search_free(&dev_priv->mm.gtt_space, + min_size, alignment, 0)) + return 0; + + /* + * The goal is to evict objects and amalgamate space in LRU order. + * The oldest idle objects reside on the inactive list, which is in + * retirement order. The next objects to retire are those on the (per + * ring) active list that do not have an outstanding flush. Once the + * hardware reports completion (the seqno is updated after the + * batchbuffer has been finished) the clean buffer objects would + * be retired to the inactive list. Any dirty objects would be added + * to the tail of the flushing list. So after processing the clean + * active objects we need to emit a MI_FLUSH to retire the flushing + * list, hence the retirement order of the flushing list is in + * advance of the dirty objects on the active lists. + * + * The retirement sequence is thus: + * 1. Inactive objects (already retired) + * 2. Clean active objects + * 3. Flushing list + * 4. Dirty active objects. + * + * On each list, the oldest objects lie at the HEAD with the freshest + * object on the TAIL. + */ + + INIT_LIST_HEAD(&unwind_list); + drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment); + + /* First see if there is a large enough contiguous idle region... */ + list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) { + if (mark_free(obj_priv, &unwind_list)) + goto found; + } + + /* Now merge in the soon-to-be-expired objects... */ + i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) { + /* Does the object require an outstanding flush? */ + if (obj_priv->base.write_domain || obj_priv->pin_count) + continue; + + if (mark_free(obj_priv, &unwind_list)) + goto found; + } + + /* Finally add anything with a pending flush (in order of retirement) */ + list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list, list) { + if (obj_priv->pin_count) + continue; + + if (mark_free(obj_priv, &unwind_list)) + goto found; + } + i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) { + if (! obj_priv->base.write_domain || obj_priv->pin_count) + continue; + + if (mark_free(obj_priv, &unwind_list)) + goto found; + } + + /* Nothing found, clean up and bail out! */ + list_for_each_entry(obj_priv, &unwind_list, evict_list) { + ret = drm_mm_scan_remove_block(obj_priv->gtt_space); + BUG_ON(ret); + drm_gem_object_unreference(&obj_priv->base); + } + + /* We expect the caller to unpin, evict all and try again, or give up. + * So calling i915_gem_evict_everything() is unnecessary. + */ + return -ENOSPC; + +found: + INIT_LIST_HEAD(&eviction_list); + list_for_each_entry_safe(obj_priv, tmp_obj_priv, + &unwind_list, evict_list) { + if (drm_mm_scan_remove_block(obj_priv->gtt_space)) { + /* drm_mm doesn't allow any other other operations while + * scanning, therefore store to be evicted objects on a + * temporary list. */ + list_move(&obj_priv->evict_list, &eviction_list); + } else + drm_gem_object_unreference(&obj_priv->base); + } + + /* Unbinding will emit any required flushes */ + list_for_each_entry_safe(obj_priv, tmp_obj_priv, + &eviction_list, evict_list) { +#if WATCH_LRU + DRM_INFO("%s: evicting %p\n", __func__, &obj_priv->base); +#endif + ret = i915_gem_object_unbind(&obj_priv->base); + if (ret) + return ret; + + drm_gem_object_unreference(&obj_priv->base); + } + + /* The just created free hole should be on the top of the free stack + * maintained by drm_mm, so this BUG_ON actually executes in O(1). + * Furthermore all accessed data has just recently been used, so it + * should be really fast, too. */ + BUG_ON(!drm_mm_search_free(&dev_priv->mm.gtt_space, min_size, + alignment, 0)); + + return 0; +} + +int +i915_gem_evict_everything(struct drm_device *dev) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + int ret; + bool lists_empty; + + spin_lock(&dev_priv->mm.active_list_lock); + lists_empty = (list_empty(&dev_priv->mm.inactive_list) && + list_empty(&dev_priv->mm.flushing_list) && + list_empty(&dev_priv->render_ring.active_list) && + (!HAS_BSD(dev) + || list_empty(&dev_priv->bsd_ring.active_list))); + spin_unlock(&dev_priv->mm.active_list_lock); + + if (lists_empty) + return -ENOSPC; + + /* Flush everything (on to the inactive lists) and evict */ + ret = i915_gpu_idle(dev); + if (ret) + return ret; + + BUG_ON(!list_empty(&dev_priv->mm.flushing_list)); + + ret = i915_gem_evict_inactive(dev); + if (ret) + return ret; + + spin_lock(&dev_priv->mm.active_list_lock); + lists_empty = (list_empty(&dev_priv->mm.inactive_list) && + list_empty(&dev_priv->mm.flushing_list) && + list_empty(&dev_priv->render_ring.active_list) && + (!HAS_BSD(dev) + || list_empty(&dev_priv->bsd_ring.active_list))); + spin_unlock(&dev_priv->mm.active_list_lock); + BUG_ON(!lists_empty); + + return 0; +} + +/** Unbinds all inactive objects. */ +int +i915_gem_evict_inactive(struct drm_device *dev) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + + while (!list_empty(&dev_priv->mm.inactive_list)) { + struct drm_gem_object *obj; + int ret; + + obj = &list_first_entry(&dev_priv->mm.inactive_list, + struct drm_i915_gem_object, + list)->base; + + ret = i915_gem_object_unbind(obj); + if (ret != 0) { + DRM_ERROR("Error unbinding object: %d\n", ret); + return ret; + } + } + + return 0; +} |