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 <drm/i915_drm.h> 31 32 #include "i915_drv.h" 33 #include "intel_drv.h" 34 #include "i915_trace.h" 35 36 static bool 37 mark_free(struct i915_vma *vma, struct list_head *unwind) 38 { 39 if (vma->pin_count) 40 return false; 41 42 if (WARN_ON(!list_empty(&vma->exec_list))) 43 return false; 44 45 list_add(&vma->exec_list, unwind); 46 return drm_mm_scan_add_block(&vma->node); 47 } 48 49 /** 50 * i915_gem_evict_something - Evict vmas to make room for binding a new one 51 * @dev: drm_device 52 * @vm: address space to evict from 53 * @min_size: size of the desired free space 54 * @alignment: alignment constraint of the desired free space 55 * @cache_level: cache_level for the desired space 56 * @start: start (inclusive) of the range from which to evict objects 57 * @end: end (exclusive) of the range from which to evict objects 58 * @flags: additional flags to control the eviction algorithm 59 * 60 * This function will try to evict vmas until a free space satisfying the 61 * requirements is found. Callers must check first whether any such hole exists 62 * already before calling this function. 63 * 64 * This function is used by the object/vma binding code. 65 * 66 * To clarify: This is for freeing up virtual address space, not for freeing 67 * memory in e.g. the shrinker. 68 */ 69 int 70 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, 71 int min_size, unsigned alignment, unsigned cache_level, 72 unsigned long start, unsigned long end, 73 unsigned flags) 74 { 75 struct list_head eviction_list, unwind_list; 76 struct i915_vma *vma; 77 int ret = 0; 78 int pass = 0; 79 80 trace_i915_gem_evict(dev, min_size, alignment, flags); 81 82 /* 83 * The goal is to evict objects and amalgamate space in LRU order. 84 * The oldest idle objects reside on the inactive list, which is in 85 * retirement order. The next objects to retire are those on the (per 86 * ring) active list that do not have an outstanding flush. Once the 87 * hardware reports completion (the seqno is updated after the 88 * batchbuffer has been finished) the clean buffer objects would 89 * be retired to the inactive list. Any dirty objects would be added 90 * to the tail of the flushing list. So after processing the clean 91 * active objects we need to emit a MI_FLUSH to retire the flushing 92 * list, hence the retirement order of the flushing list is in 93 * advance of the dirty objects on the active lists. 94 * 95 * The retirement sequence is thus: 96 * 1. Inactive objects (already retired) 97 * 2. Clean active objects 98 * 3. Flushing list 99 * 4. Dirty active objects. 100 * 101 * On each list, the oldest objects lie at the HEAD with the freshest 102 * object on the TAIL. 103 */ 104 105 INIT_LIST_HEAD(&unwind_list); 106 if (start != 0 || end != vm->total) { 107 drm_mm_init_scan_with_range(&vm->mm, min_size, 108 alignment, cache_level, 109 start, end); 110 } else 111 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); 112 113 search_again: 114 /* First see if there is a large enough contiguous idle region... */ 115 list_for_each_entry(vma, &vm->inactive_list, mm_list) { 116 if (mark_free(vma, &unwind_list)) 117 goto found; 118 } 119 120 if (flags & PIN_NONBLOCK) 121 goto none; 122 123 /* Now merge in the soon-to-be-expired objects... */ 124 list_for_each_entry(vma, &vm->active_list, mm_list) { 125 if (mark_free(vma, &unwind_list)) 126 goto found; 127 } 128 129 none: 130 /* Nothing found, clean up and bail out! */ 131 while (!list_empty(&unwind_list)) { 132 vma = list_first_entry(&unwind_list, 133 struct i915_vma, 134 exec_list); 135 ret = drm_mm_scan_remove_block(&vma->node); 136 BUG_ON(ret); 137 138 list_del_init(&vma->exec_list); 139 } 140 141 /* Can we unpin some objects such as idle hw contents, 142 * or pending flips? 143 */ 144 if (flags & PIN_NONBLOCK) 145 return -ENOSPC; 146 147 /* Only idle the GPU and repeat the search once */ 148 if (pass++ == 0) { 149 ret = i915_gpu_idle(dev); 150 if (ret) 151 return ret; 152 153 i915_gem_retire_requests(dev); 154 goto search_again; 155 } 156 157 /* If we still have pending pageflip completions, drop 158 * back to userspace to give our workqueues time to 159 * acquire our locks and unpin the old scanouts. 160 */ 161 return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; 162 163 found: 164 /* drm_mm doesn't allow any other other operations while 165 * scanning, therefore store to be evicted objects on a 166 * temporary list. */ 167 INIT_LIST_HEAD(&eviction_list); 168 while (!list_empty(&unwind_list)) { 169 vma = list_first_entry(&unwind_list, 170 struct i915_vma, 171 exec_list); 172 if (drm_mm_scan_remove_block(&vma->node)) { 173 list_move(&vma->exec_list, &eviction_list); 174 drm_gem_object_reference(&vma->obj->base); 175 continue; 176 } 177 list_del_init(&vma->exec_list); 178 } 179 180 /* Unbinding will emit any required flushes */ 181 while (!list_empty(&eviction_list)) { 182 struct drm_gem_object *obj; 183 vma = list_first_entry(&eviction_list, 184 struct i915_vma, 185 exec_list); 186 187 obj = &vma->obj->base; 188 list_del_init(&vma->exec_list); 189 if (ret == 0) 190 ret = i915_vma_unbind(vma); 191 192 drm_gem_object_unreference(obj); 193 } 194 195 return ret; 196 } 197 198 /** 199 * i915_gem_evict_vm - Evict all idle vmas from a vm 200 * @vm: Address space to cleanse 201 * @do_idle: Boolean directing whether to idle first. 202 * 203 * This function evicts all idles vmas from a vm. If all unpinned vmas should be 204 * evicted the @do_idle needs to be set to true. 205 * 206 * This is used by the execbuf code as a last-ditch effort to defragment the 207 * address space. 208 * 209 * To clarify: This is for freeing up virtual address space, not for freeing 210 * memory in e.g. the shrinker. 211 */ 212 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) 213 { 214 struct i915_vma *vma, *next; 215 int ret; 216 217 WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex)); 218 trace_i915_gem_evict_vm(vm); 219 220 if (do_idle) { 221 ret = i915_gpu_idle(vm->dev); 222 if (ret) 223 return ret; 224 225 i915_gem_retire_requests(vm->dev); 226 227 WARN_ON(!list_empty(&vm->active_list)); 228 } 229 230 list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) 231 if (vma->pin_count == 0) 232 WARN_ON(i915_vma_unbind(vma)); 233 234 return 0; 235 } 236 237 /** 238 * i915_gem_evict_everything - Try to evict all objects 239 * @dev: Device to evict objects for 240 * 241 * This functions tries to evict all gem objects from all address spaces. Used 242 * by the shrinker as a last-ditch effort and for suspend, before releasing the 243 * backing storage of all unbound objects. 244 */ 245 int 246 i915_gem_evict_everything(struct drm_device *dev) 247 { 248 struct drm_i915_private *dev_priv = dev->dev_private; 249 struct i915_address_space *vm, *v; 250 bool lists_empty = true; 251 int ret; 252 253 list_for_each_entry(vm, &dev_priv->vm_list, global_link) { 254 lists_empty = (list_empty(&vm->inactive_list) && 255 list_empty(&vm->active_list)); 256 if (!lists_empty) 257 lists_empty = false; 258 } 259 260 if (lists_empty) 261 return -ENOSPC; 262 263 trace_i915_gem_evict_everything(dev); 264 265 /* The gpu_idle will flush everything in the write domain to the 266 * active list. Then we must move everything off the active list 267 * with retire requests. 268 */ 269 ret = i915_gpu_idle(dev); 270 if (ret) 271 return ret; 272 273 i915_gem_retire_requests(dev); 274 275 /* Having flushed everything, unbind() should never raise an error */ 276 list_for_each_entry_safe(vm, v, &dev_priv->vm_list, global_link) 277 WARN_ON(i915_gem_evict_vm(vm, false)); 278 279 return 0; 280 } 281