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->obj->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 int 50 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, 51 int min_size, unsigned alignment, unsigned cache_level, 52 bool mappable, bool nonblocking) 53 { 54 drm_i915_private_t *dev_priv = dev->dev_private; 55 struct list_head eviction_list, unwind_list; 56 struct i915_vma *vma; 57 int ret = 0; 58 int pass = 0; 59 60 trace_i915_gem_evict(dev, min_size, alignment, mappable); 61 62 /* 63 * The goal is to evict objects and amalgamate space in LRU order. 64 * The oldest idle objects reside on the inactive list, which is in 65 * retirement order. The next objects to retire are those on the (per 66 * ring) active list that do not have an outstanding flush. Once the 67 * hardware reports completion (the seqno is updated after the 68 * batchbuffer has been finished) the clean buffer objects would 69 * be retired to the inactive list. Any dirty objects would be added 70 * to the tail of the flushing list. So after processing the clean 71 * active objects we need to emit a MI_FLUSH to retire the flushing 72 * list, hence the retirement order of the flushing list is in 73 * advance of the dirty objects on the active lists. 74 * 75 * The retirement sequence is thus: 76 * 1. Inactive objects (already retired) 77 * 2. Clean active objects 78 * 3. Flushing list 79 * 4. Dirty active objects. 80 * 81 * On each list, the oldest objects lie at the HEAD with the freshest 82 * object on the TAIL. 83 */ 84 85 INIT_LIST_HEAD(&unwind_list); 86 if (mappable) { 87 BUG_ON(!i915_is_ggtt(vm)); 88 drm_mm_init_scan_with_range(&vm->mm, min_size, 89 alignment, cache_level, 0, 90 dev_priv->gtt.mappable_end); 91 } else 92 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); 93 94 search_again: 95 /* First see if there is a large enough contiguous idle region... */ 96 list_for_each_entry(vma, &vm->inactive_list, mm_list) { 97 if (mark_free(vma, &unwind_list)) 98 goto found; 99 } 100 101 if (nonblocking) 102 goto none; 103 104 /* Now merge in the soon-to-be-expired objects... */ 105 list_for_each_entry(vma, &vm->active_list, mm_list) { 106 if (mark_free(vma, &unwind_list)) 107 goto found; 108 } 109 110 none: 111 /* Nothing found, clean up and bail out! */ 112 while (!list_empty(&unwind_list)) { 113 vma = list_first_entry(&unwind_list, 114 struct i915_vma, 115 exec_list); 116 ret = drm_mm_scan_remove_block(&vma->node); 117 BUG_ON(ret); 118 119 list_del_init(&vma->exec_list); 120 } 121 122 /* Can we unpin some objects such as idle hw contents, 123 * or pending flips? 124 */ 125 if (nonblocking) 126 return -ENOSPC; 127 128 /* Only idle the GPU and repeat the search once */ 129 if (pass++ == 0) { 130 ret = i915_gpu_idle(dev); 131 if (ret) 132 return ret; 133 134 i915_gem_retire_requests(dev); 135 goto search_again; 136 } 137 138 /* If we still have pending pageflip completions, drop 139 * back to userspace to give our workqueues time to 140 * acquire our locks and unpin the old scanouts. 141 */ 142 return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; 143 144 found: 145 /* drm_mm doesn't allow any other other operations while 146 * scanning, therefore store to be evicted objects on a 147 * temporary list. */ 148 INIT_LIST_HEAD(&eviction_list); 149 while (!list_empty(&unwind_list)) { 150 vma = list_first_entry(&unwind_list, 151 struct i915_vma, 152 exec_list); 153 if (drm_mm_scan_remove_block(&vma->node)) { 154 list_move(&vma->exec_list, &eviction_list); 155 drm_gem_object_reference(&vma->obj->base); 156 continue; 157 } 158 list_del_init(&vma->exec_list); 159 } 160 161 /* Unbinding will emit any required flushes */ 162 while (!list_empty(&eviction_list)) { 163 struct drm_gem_object *obj; 164 vma = list_first_entry(&eviction_list, 165 struct i915_vma, 166 exec_list); 167 168 obj = &vma->obj->base; 169 list_del_init(&vma->exec_list); 170 if (ret == 0) 171 ret = i915_vma_unbind(vma); 172 173 drm_gem_object_unreference(obj); 174 } 175 176 return ret; 177 } 178 179 /** 180 * i915_gem_evict_vm - Try to free up VM space 181 * 182 * @vm: Address space to evict from 183 * @do_idle: Boolean directing whether to idle first. 184 * 185 * VM eviction is about freeing up virtual address space. If one wants fine 186 * grained eviction, they should see evict something for more details. In terms 187 * of freeing up actual system memory, this function may not accomplish the 188 * desired result. An object may be shared in multiple address space, and this 189 * function will not assert those objects be freed. 190 * 191 * Using do_idle will result in a more complete eviction because it retires, and 192 * inactivates current BOs. 193 */ 194 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) 195 { 196 struct i915_vma *vma, *next; 197 int ret; 198 199 trace_i915_gem_evict_vm(vm); 200 201 if (do_idle) { 202 ret = i915_gpu_idle(vm->dev); 203 if (ret) 204 return ret; 205 206 i915_gem_retire_requests(vm->dev); 207 } 208 209 list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) 210 if (vma->obj->pin_count == 0) 211 WARN_ON(i915_vma_unbind(vma)); 212 213 return 0; 214 } 215 216 int 217 i915_gem_evict_everything(struct drm_device *dev) 218 { 219 drm_i915_private_t *dev_priv = dev->dev_private; 220 struct i915_address_space *vm; 221 bool lists_empty = true; 222 int ret; 223 224 list_for_each_entry(vm, &dev_priv->vm_list, global_link) { 225 lists_empty = (list_empty(&vm->inactive_list) && 226 list_empty(&vm->active_list)); 227 if (!lists_empty) 228 lists_empty = false; 229 } 230 231 if (lists_empty) 232 return -ENOSPC; 233 234 trace_i915_gem_evict_everything(dev); 235 236 /* The gpu_idle will flush everything in the write domain to the 237 * active list. Then we must move everything off the active list 238 * with retire requests. 239 */ 240 ret = i915_gpu_idle(dev); 241 if (ret) 242 return ret; 243 244 i915_gem_retire_requests(dev); 245 246 /* Having flushed everything, unbind() should never raise an error */ 247 list_for_each_entry(vm, &dev_priv->vm_list, global_link) 248 WARN_ON(i915_gem_evict_vm(vm, false)); 249 250 return 0; 251 } 252