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