1235783Skib/* 2235783Skib * Copyright �� 2008-2010 Intel Corporation 3235783Skib * 4235783Skib * Permission is hereby granted, free of charge, to any person obtaining a 5235783Skib * copy of this software and associated documentation files (the "Software"), 6235783Skib * to deal in the Software without restriction, including without limitation 7235783Skib * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8235783Skib * and/or sell copies of the Software, and to permit persons to whom the 9235783Skib * Software is furnished to do so, subject to the following conditions: 10235783Skib * 11235783Skib * The above copyright notice and this permission notice (including the next 12235783Skib * paragraph) shall be included in all copies or substantial portions of the 13235783Skib * Software. 14235783Skib * 15235783Skib * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16235783Skib * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17235783Skib * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18235783Skib * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19235783Skib * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20235783Skib * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21235783Skib * IN THE SOFTWARE. 22235783Skib * 23235783Skib * Authors: 24235783Skib * Eric Anholt <eric@anholt.net> 25235783Skib * Chris Wilson <chris@chris-wilson.co.uuk> 26235783Skib * 27235783Skib */ 28235783Skib 29235783Skib#include <sys/cdefs.h> 30235783Skib__FBSDID("$FreeBSD$"); 31235783Skib 32235783Skib#include <dev/drm2/drmP.h> 33235783Skib#include <dev/drm2/drm.h> 34235783Skib#include <dev/drm2/i915/i915_drm.h> 35235783Skib#include <dev/drm2/i915/i915_drv.h> 36235783Skib 37235783Skibstatic bool 38235783Skibmark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 39235783Skib{ 40235783Skib list_add(&obj->exec_list, unwind); 41235783Skib return drm_mm_scan_add_block(obj->gtt_space); 42235783Skib} 43235783Skib 44235783Skibint 45235783Skibi915_gem_evict_something(struct drm_device *dev, int min_size, 46235783Skib unsigned alignment, bool mappable) 47235783Skib{ 48235783Skib drm_i915_private_t *dev_priv = dev->dev_private; 49235783Skib struct list_head eviction_list, unwind_list; 50235783Skib struct drm_i915_gem_object *obj; 51235783Skib int ret = 0; 52235783Skib 53235783Skib CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size, 54235783Skib alignment, mappable); 55235783Skib 56235783Skib /* 57235783Skib * The goal is to evict objects and amalgamate space in LRU order. 58235783Skib * The oldest idle objects reside on the inactive list, which is in 59235783Skib * retirement order. The next objects to retire are those on the (per 60235783Skib * ring) active list that do not have an outstanding flush. Once the 61235783Skib * hardware reports completion (the seqno is updated after the 62235783Skib * batchbuffer has been finished) the clean buffer objects would 63235783Skib * be retired to the inactive list. Any dirty objects would be added 64235783Skib * to the tail of the flushing list. So after processing the clean 65235783Skib * active objects we need to emit a MI_FLUSH to retire the flushing 66235783Skib * list, hence the retirement order of the flushing list is in 67235783Skib * advance of the dirty objects on the active lists. 68235783Skib * 69235783Skib * The retirement sequence is thus: 70235783Skib * 1. Inactive objects (already retired) 71235783Skib * 2. Clean active objects 72235783Skib * 3. Flushing list 73235783Skib * 4. Dirty active objects. 74235783Skib * 75235783Skib * On each list, the oldest objects lie at the HEAD with the freshest 76235783Skib * object on the TAIL. 77235783Skib */ 78235783Skib 79235783Skib INIT_LIST_HEAD(&unwind_list); 80235783Skib if (mappable) 81235783Skib drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size, 82235783Skib alignment, 0, 83235783Skib dev_priv->mm.gtt_mappable_end); 84235783Skib else 85235783Skib drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment); 86235783Skib 87235783Skib /* First see if there is a large enough contiguous idle region... */ 88235783Skib list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 89235783Skib if (mark_free(obj, &unwind_list)) 90235783Skib goto found; 91235783Skib } 92235783Skib 93235783Skib /* Now merge in the soon-to-be-expired objects... */ 94235783Skib list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 95235783Skib /* Does the object require an outstanding flush? */ 96235783Skib if (obj->base.write_domain || obj->pin_count) 97235783Skib continue; 98235783Skib 99235783Skib if (mark_free(obj, &unwind_list)) 100235783Skib goto found; 101235783Skib } 102235783Skib 103235783Skib /* Finally add anything with a pending flush (in order of retirement) */ 104235783Skib list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) { 105235783Skib if (obj->pin_count) 106235783Skib continue; 107235783Skib 108235783Skib if (mark_free(obj, &unwind_list)) 109235783Skib goto found; 110235783Skib } 111235783Skib list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 112235783Skib if (!obj->base.write_domain || obj->pin_count) 113235783Skib continue; 114235783Skib 115235783Skib if (mark_free(obj, &unwind_list)) 116235783Skib goto found; 117235783Skib } 118235783Skib 119235783Skib /* Nothing found, clean up and bail out! */ 120235783Skib while (!list_empty(&unwind_list)) { 121235783Skib obj = list_first_entry(&unwind_list, 122235783Skib struct drm_i915_gem_object, 123235783Skib exec_list); 124235783Skib 125235783Skib ret = drm_mm_scan_remove_block(obj->gtt_space); 126235783Skib KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret)); 127235783Skib 128235783Skib list_del_init(&obj->exec_list); 129235783Skib } 130235783Skib 131235783Skib /* We expect the caller to unpin, evict all and try again, or give up. 132235783Skib * So calling i915_gem_evict_everything() is unnecessary. 133235783Skib */ 134235783Skib return -ENOSPC; 135235783Skib 136235783Skibfound: 137235783Skib /* drm_mm doesn't allow any other other operations while 138235783Skib * scanning, therefore store to be evicted objects on a 139235783Skib * temporary list. */ 140235783Skib INIT_LIST_HEAD(&eviction_list); 141235783Skib while (!list_empty(&unwind_list)) { 142235783Skib obj = list_first_entry(&unwind_list, 143235783Skib struct drm_i915_gem_object, 144235783Skib exec_list); 145235783Skib if (drm_mm_scan_remove_block(obj->gtt_space)) { 146235783Skib list_move(&obj->exec_list, &eviction_list); 147235783Skib drm_gem_object_reference(&obj->base); 148235783Skib continue; 149235783Skib } 150235783Skib list_del_init(&obj->exec_list); 151235783Skib } 152235783Skib 153235783Skib /* Unbinding will emit any required flushes */ 154235783Skib while (!list_empty(&eviction_list)) { 155235783Skib obj = list_first_entry(&eviction_list, 156235783Skib struct drm_i915_gem_object, 157235783Skib exec_list); 158235783Skib if (ret == 0) 159235783Skib ret = i915_gem_object_unbind(obj); 160235783Skib 161235783Skib list_del_init(&obj->exec_list); 162235783Skib drm_gem_object_unreference(&obj->base); 163235783Skib } 164235783Skib 165235783Skib return ret; 166235783Skib} 167235783Skib 168235783Skibint 169235783Skibi915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) 170235783Skib{ 171235783Skib drm_i915_private_t *dev_priv = dev->dev_private; 172235783Skib int ret; 173235783Skib bool lists_empty; 174235783Skib 175235783Skib lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 176235783Skib list_empty(&dev_priv->mm.flushing_list) && 177235783Skib list_empty(&dev_priv->mm.active_list)); 178235783Skib if (lists_empty) 179235783Skib return -ENOSPC; 180235783Skib 181235783Skib CTR2(KTR_DRM, "evict_everything %p %d", dev, purgeable_only); 182235783Skib 183235783Skib /* Flush everything (on to the inactive lists) and evict */ 184235783Skib ret = i915_gpu_idle(dev, true); 185235783Skib if (ret) 186235783Skib return ret; 187235783Skib 188235783Skib KASSERT(list_empty(&dev_priv->mm.flushing_list), 189235783Skib ("flush list not empty")); 190235783Skib 191235783Skib return i915_gem_evict_inactive(dev, purgeable_only); 192235783Skib} 193235783Skib 194235783Skib/** Unbinds all inactive objects. */ 195235783Skibint 196235783Skibi915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only) 197235783Skib{ 198235783Skib drm_i915_private_t *dev_priv = dev->dev_private; 199235783Skib struct drm_i915_gem_object *obj, *next; 200235783Skib 201235783Skib CTR2(KTR_DRM, "evict_inactive %p %d", dev, purgeable_only); 202235783Skib 203235783Skib list_for_each_entry_safe(obj, next, 204235783Skib &dev_priv->mm.inactive_list, mm_list) { 205235783Skib if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) { 206235783Skib int ret = i915_gem_object_unbind(obj); 207235783Skib if (ret) 208235783Skib return ret; 209235783Skib } 210235783Skib } 211235783Skib 212235783Skib return 0; 213235783Skib} 214