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 <drm/drmP.h> 30 #include "i915_drv.h" 31 #include <drm/i915_drm.h> 32 #include "i915_trace.h" 33 34 static bool 35 mark_free(struct i915_vma *vma, struct list_head *unwind) 36 { 37 if (vma->obj->pin_count) 38 return false; 39 40 if (WARN_ON(!list_empty(&vma->exec_list))) 41 return false; 42 43 list_add(&vma->exec_list, unwind); 44 return drm_mm_scan_add_block(&vma->node); 45 } 46 47 int 48 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, 49 int min_size, unsigned alignment, unsigned cache_level, 50 bool mappable, bool nonblocking) 51 { 52 drm_i915_private_t *dev_priv = dev->dev_private; 53 struct list_head eviction_list, unwind_list; 54 struct i915_vma *vma; 55 int ret = 0; 56 57 trace_i915_gem_evict(dev, min_size, 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 BUG_ON(!i915_is_ggtt(vm)); 85 drm_mm_init_scan_with_range(&vm->mm, min_size, 86 alignment, cache_level, 0, 87 dev_priv->gtt.mappable_end); 88 } else 89 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); 90 91 /* First see if there is a large enough contiguous idle region... */ 92 list_for_each_entry(vma, &vm->inactive_list, mm_list) { 93 if (mark_free(vma, &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(vma, &vm->active_list, mm_list) { 102 if (mark_free(vma, &unwind_list)) 103 goto found; 104 } 105 106 none: 107 /* Nothing found, clean up and bail out! */ 108 while (!list_empty(&unwind_list)) { 109 vma = list_first_entry(&unwind_list, 110 struct i915_vma, 111 exec_list); 112 ret = drm_mm_scan_remove_block(&vma->node); 113 BUG_ON(ret); 114 115 list_del_init(&vma->exec_list); 116 } 117 118 /* We expect the caller to unpin, evict all and try again, or give up. 119 * So calling i915_gem_evict_vm() is unnecessary. 120 */ 121 return -ENOSPC; 122 123 found: 124 /* drm_mm doesn't allow any other other operations while 125 * scanning, therefore store to be evicted objects on a 126 * temporary list. */ 127 INIT_LIST_HEAD(&eviction_list); 128 while (!list_empty(&unwind_list)) { 129 vma = list_first_entry(&unwind_list, 130 struct i915_vma, 131 exec_list); 132 if (drm_mm_scan_remove_block(&vma->node)) { 133 list_move(&vma->exec_list, &eviction_list); 134 drm_gem_object_reference(&vma->obj->base); 135 continue; 136 } 137 list_del_init(&vma->exec_list); 138 } 139 140 /* Unbinding will emit any required flushes */ 141 while (!list_empty(&eviction_list)) { 142 struct drm_gem_object *obj; 143 vma = list_first_entry(&eviction_list, 144 struct i915_vma, 145 exec_list); 146 147 obj = &vma->obj->base; 148 list_del_init(&vma->exec_list); 149 if (ret == 0) 150 ret = i915_vma_unbind(vma); 151 152 drm_gem_object_unreference(obj); 153 } 154 155 return ret; 156 } 157 158 /** 159 * i915_gem_evict_vm - Try to free up VM space 160 * 161 * @vm: Address space to evict from 162 * @do_idle: Boolean directing whether to idle first. 163 * 164 * VM eviction is about freeing up virtual address space. If one wants fine 165 * grained eviction, they should see evict something for more details. In terms 166 * of freeing up actual system memory, this function may not accomplish the 167 * desired result. An object may be shared in multiple address space, and this 168 * function will not assert those objects be freed. 169 * 170 * Using do_idle will result in a more complete eviction because it retires, and 171 * inactivates current BOs. 172 */ 173 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) 174 { 175 struct i915_vma *vma, *next; 176 int ret; 177 178 trace_i915_gem_evict_vm(vm); 179 180 if (do_idle) { 181 ret = i915_gpu_idle(vm->dev); 182 if (ret) 183 return ret; 184 185 i915_gem_retire_requests(vm->dev); 186 } 187 188 list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) 189 if (vma->obj->pin_count == 0) 190 WARN_ON(i915_vma_unbind(vma)); 191 192 return 0; 193 } 194 195 int 196 i915_gem_evict_everything(struct drm_device *dev) 197 { 198 drm_i915_private_t *dev_priv = dev->dev_private; 199 struct i915_address_space *vm; 200 bool lists_empty = true; 201 int ret; 202 203 list_for_each_entry(vm, &dev_priv->vm_list, global_link) { 204 lists_empty = (list_empty(&vm->inactive_list) && 205 list_empty(&vm->active_list)); 206 if (!lists_empty) 207 lists_empty = false; 208 } 209 210 if (lists_empty) 211 return -ENOSPC; 212 213 trace_i915_gem_evict_everything(dev); 214 215 /* The gpu_idle will flush everything in the write domain to the 216 * active list. Then we must move everything off the active list 217 * with retire requests. 218 */ 219 ret = i915_gpu_idle(dev); 220 if (ret) 221 return ret; 222 223 i915_gem_retire_requests(dev); 224 225 /* Having flushed everything, unbind() should never raise an error */ 226 list_for_each_entry(vm, &dev_priv->vm_list, global_link) 227 WARN_ON(i915_gem_evict_vm(vm, false)); 228 229 return 0; 230 } 231