i915_gem_evict.c revision 296548
1/* 2 * Copyright �� 2008-2010 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric@anholt.net> 25 * Chris Wilson <chris@chris-wilson.co.uuk> 26 * 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/dev/drm2/i915/i915_gem_evict.c 296548 2016-03-08 20:33:02Z dumbbell $"); 31 32#include <dev/drm2/drmP.h> 33#include <dev/drm2/i915/i915_drv.h> 34#include <dev/drm2/i915/i915_drm.h> 35 36static bool 37mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 38{ 39 if (obj->pin_count) 40 return false; 41 42 list_add(&obj->exec_list, unwind); 43 return drm_mm_scan_add_block(obj->gtt_space); 44} 45 46int 47i915_gem_evict_something(struct drm_device *dev, int min_size, 48 unsigned alignment, unsigned cache_level, 49 bool mappable, bool nonblocking) 50{ 51 drm_i915_private_t *dev_priv = dev->dev_private; 52 struct list_head eviction_list, unwind_list; 53 struct drm_i915_gem_object *obj; 54 int ret = 0; 55 56 CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size, 57 alignment, mappable); 58 59 /* 60 * The goal is to evict objects and amalgamate space in LRU order. 61 * The oldest idle objects reside on the inactive list, which is in 62 * retirement order. The next objects to retire are those on the (per 63 * ring) active list that do not have an outstanding flush. Once the 64 * hardware reports completion (the seqno is updated after the 65 * batchbuffer has been finished) the clean buffer objects would 66 * be retired to the inactive list. Any dirty objects would be added 67 * to the tail of the flushing list. So after processing the clean 68 * active objects we need to emit a MI_FLUSH to retire the flushing 69 * list, hence the retirement order of the flushing list is in 70 * advance of the dirty objects on the active lists. 71 * 72 * The retirement sequence is thus: 73 * 1. Inactive objects (already retired) 74 * 2. Clean active objects 75 * 3. Flushing list 76 * 4. Dirty active objects. 77 * 78 * On each list, the oldest objects lie at the HEAD with the freshest 79 * object on the TAIL. 80 */ 81 82 INIT_LIST_HEAD(&unwind_list); 83 if (mappable) 84 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, 85 min_size, alignment, cache_level, 86 0, dev_priv->mm.gtt_mappable_end); 87 else 88 drm_mm_init_scan(&dev_priv->mm.gtt_space, 89 min_size, alignment, cache_level); 90 91 /* First see if there is a large enough contiguous idle region... */ 92 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 93 if (mark_free(obj, &unwind_list)) 94 goto found; 95 } 96 97 if (nonblocking) 98 goto none; 99 100 /* Now merge in the soon-to-be-expired objects... */ 101 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 102 if (mark_free(obj, &unwind_list)) 103 goto found; 104 } 105 106none: 107 /* Nothing found, clean up and bail out! */ 108 while (!list_empty(&unwind_list)) { 109 obj = list_first_entry(&unwind_list, 110 struct drm_i915_gem_object, 111 exec_list); 112 113 ret = drm_mm_scan_remove_block(obj->gtt_space); 114 BUG_ON(ret); 115 116 list_del_init(&obj->exec_list); 117 } 118 119 /* We expect the caller to unpin, evict all and try again, or give up. 120 * So calling i915_gem_evict_everything() is unnecessary. 121 */ 122 return -ENOSPC; 123 124found: 125 /* drm_mm doesn't allow any other other operations while 126 * scanning, therefore store to be evicted objects on a 127 * temporary list. */ 128 INIT_LIST_HEAD(&eviction_list); 129 while (!list_empty(&unwind_list)) { 130 obj = list_first_entry(&unwind_list, 131 struct drm_i915_gem_object, 132 exec_list); 133 if (drm_mm_scan_remove_block(obj->gtt_space)) { 134 list_move(&obj->exec_list, &eviction_list); 135 drm_gem_object_reference(&obj->base); 136 continue; 137 } 138 list_del_init(&obj->exec_list); 139 } 140 141 /* Unbinding will emit any required flushes */ 142 while (!list_empty(&eviction_list)) { 143 obj = list_first_entry(&eviction_list, 144 struct drm_i915_gem_object, 145 exec_list); 146 if (ret == 0) 147 ret = i915_gem_object_unbind(obj); 148 149 list_del_init(&obj->exec_list); 150 drm_gem_object_unreference(&obj->base); 151 } 152 153 return ret; 154} 155 156int 157i915_gem_evict_everything(struct drm_device *dev) 158{ 159 drm_i915_private_t *dev_priv = dev->dev_private; 160 struct drm_i915_gem_object *obj, *next; 161 bool lists_empty; 162 int ret; 163 164 lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 165 list_empty(&dev_priv->mm.active_list)); 166 if (lists_empty) 167 return -ENOSPC; 168 169 CTR1(KTR_DRM, "evict_everything %p", dev); 170 171 /* The gpu_idle will flush everything in the write domain to the 172 * active list. Then we must move everything off the active list 173 * with retire requests. 174 */ 175 ret = i915_gpu_idle(dev); 176 if (ret) 177 return ret; 178 179 i915_gem_retire_requests(dev); 180 181 /* Having flushed everything, unbind() should never raise an error */ 182 list_for_each_entry_safe(obj, next, 183 &dev_priv->mm.inactive_list, mm_list) 184 if (obj->pin_count == 0) 185 WARN_ON(i915_gem_object_unbind(obj)); 186 187 return 0; 188} 189