1 /* 2 * Copyright © 2017 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 */ 24 25 #include <linux/sched/mm.h> 26 27 #include "display/intel_frontbuffer.h" 28 #include "gt/intel_gt.h" 29 #include "i915_drv.h" 30 #include "i915_gem_clflush.h" 31 #include "i915_gem_context.h" 32 #include "i915_gem_mman.h" 33 #include "i915_gem_object.h" 34 #include "i915_globals.h" 35 #include "i915_trace.h" 36 37 static struct i915_global_object { 38 struct i915_global base; 39 struct kmem_cache *slab_objects; 40 } global; 41 42 struct drm_i915_gem_object *i915_gem_object_alloc(void) 43 { 44 return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL); 45 } 46 47 void i915_gem_object_free(struct drm_i915_gem_object *obj) 48 { 49 return kmem_cache_free(global.slab_objects, obj); 50 } 51 52 void i915_gem_object_init(struct drm_i915_gem_object *obj, 53 const struct drm_i915_gem_object_ops *ops, 54 struct lock_class_key *key) 55 { 56 __mutex_init(&obj->mm.lock, ops->name ?: "obj->mm.lock", key); 57 58 spin_lock_init(&obj->vma.lock); 59 INIT_LIST_HEAD(&obj->vma.list); 60 61 INIT_LIST_HEAD(&obj->mm.link); 62 63 INIT_LIST_HEAD(&obj->lut_list); 64 spin_lock_init(&obj->lut_lock); 65 66 spin_lock_init(&obj->mmo.lock); 67 obj->mmo.offsets = RB_ROOT; 68 69 init_rcu_head(&obj->rcu); 70 71 obj->ops = ops; 72 73 obj->mm.madv = I915_MADV_WILLNEED; 74 INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN); 75 mutex_init(&obj->mm.get_page.lock); 76 77 if (IS_ENABLED(CONFIG_LOCKDEP) && i915_gem_object_is_shrinkable(obj)) 78 i915_gem_shrinker_taints_mutex(to_i915(obj->base.dev), 79 &obj->mm.lock); 80 } 81 82 /** 83 * Mark up the object's coherency levels for a given cache_level 84 * @obj: #drm_i915_gem_object 85 * @cache_level: cache level 86 */ 87 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj, 88 unsigned int cache_level) 89 { 90 obj->cache_level = cache_level; 91 92 if (cache_level != I915_CACHE_NONE) 93 obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ | 94 I915_BO_CACHE_COHERENT_FOR_WRITE); 95 else if (HAS_LLC(to_i915(obj->base.dev))) 96 obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ; 97 else 98 obj->cache_coherent = 0; 99 100 obj->cache_dirty = 101 !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE); 102 } 103 104 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file) 105 { 106 struct drm_i915_gem_object *obj = to_intel_bo(gem); 107 struct drm_i915_file_private *fpriv = file->driver_priv; 108 struct i915_lut_handle bookmark = {}; 109 struct i915_mmap_offset *mmo, *mn; 110 struct i915_lut_handle *lut, *ln; 111 LIST_HEAD(close); 112 113 spin_lock(&obj->lut_lock); 114 list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) { 115 struct i915_gem_context *ctx = lut->ctx; 116 117 if (ctx && ctx->file_priv == fpriv) { 118 i915_gem_context_get(ctx); 119 list_move(&lut->obj_link, &close); 120 } 121 122 /* Break long locks, and carefully continue on from this spot */ 123 if (&ln->obj_link != &obj->lut_list) { 124 list_add_tail(&bookmark.obj_link, &ln->obj_link); 125 if (cond_resched_lock(&obj->lut_lock)) 126 list_safe_reset_next(&bookmark, ln, obj_link); 127 __list_del_entry(&bookmark.obj_link); 128 } 129 } 130 spin_unlock(&obj->lut_lock); 131 132 spin_lock(&obj->mmo.lock); 133 rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset) 134 drm_vma_node_revoke(&mmo->vma_node, file); 135 spin_unlock(&obj->mmo.lock); 136 137 list_for_each_entry_safe(lut, ln, &close, obj_link) { 138 struct i915_gem_context *ctx = lut->ctx; 139 struct i915_vma *vma; 140 141 /* 142 * We allow the process to have multiple handles to the same 143 * vma, in the same fd namespace, by virtue of flink/open. 144 */ 145 146 mutex_lock(&ctx->lut_mutex); 147 vma = radix_tree_delete(&ctx->handles_vma, lut->handle); 148 if (vma) { 149 GEM_BUG_ON(vma->obj != obj); 150 GEM_BUG_ON(!atomic_read(&vma->open_count)); 151 i915_vma_close(vma); 152 } 153 mutex_unlock(&ctx->lut_mutex); 154 155 i915_gem_context_put(lut->ctx); 156 i915_lut_handle_free(lut); 157 i915_gem_object_put(obj); 158 } 159 } 160 161 static void __i915_gem_free_object_rcu(struct rcu_head *head) 162 { 163 struct drm_i915_gem_object *obj = 164 container_of(head, typeof(*obj), rcu); 165 struct drm_i915_private *i915 = to_i915(obj->base.dev); 166 167 dma_resv_fini(&obj->base._resv); 168 i915_gem_object_free(obj); 169 170 GEM_BUG_ON(!atomic_read(&i915->mm.free_count)); 171 atomic_dec(&i915->mm.free_count); 172 } 173 174 static void __i915_gem_object_free_mmaps(struct drm_i915_gem_object *obj) 175 { 176 /* Skip serialisation and waking the device if known to be not used. */ 177 178 if (obj->userfault_count) 179 i915_gem_object_release_mmap_gtt(obj); 180 181 if (!RB_EMPTY_ROOT(&obj->mmo.offsets)) { 182 struct i915_mmap_offset *mmo, *mn; 183 184 i915_gem_object_release_mmap_offset(obj); 185 186 rbtree_postorder_for_each_entry_safe(mmo, mn, 187 &obj->mmo.offsets, 188 offset) { 189 drm_vma_offset_remove(obj->base.dev->vma_offset_manager, 190 &mmo->vma_node); 191 kfree(mmo); 192 } 193 obj->mmo.offsets = RB_ROOT; 194 } 195 } 196 197 static void __i915_gem_free_objects(struct drm_i915_private *i915, 198 struct llist_node *freed) 199 { 200 struct drm_i915_gem_object *obj, *on; 201 202 llist_for_each_entry_safe(obj, on, freed, freed) { 203 trace_i915_gem_object_destroy(obj); 204 205 if (!list_empty(&obj->vma.list)) { 206 struct i915_vma *vma; 207 208 /* 209 * Note that the vma keeps an object reference while 210 * it is active, so it *should* not sleep while we 211 * destroy it. Our debug code errs insits it *might*. 212 * For the moment, play along. 213 */ 214 spin_lock(&obj->vma.lock); 215 while ((vma = list_first_entry_or_null(&obj->vma.list, 216 struct i915_vma, 217 obj_link))) { 218 GEM_BUG_ON(vma->obj != obj); 219 spin_unlock(&obj->vma.lock); 220 221 __i915_vma_put(vma); 222 223 spin_lock(&obj->vma.lock); 224 } 225 spin_unlock(&obj->vma.lock); 226 } 227 228 __i915_gem_object_free_mmaps(obj); 229 230 GEM_BUG_ON(!list_empty(&obj->lut_list)); 231 232 atomic_set(&obj->mm.pages_pin_count, 0); 233 __i915_gem_object_put_pages(obj); 234 GEM_BUG_ON(i915_gem_object_has_pages(obj)); 235 bitmap_free(obj->bit_17); 236 237 if (obj->base.import_attach) 238 drm_prime_gem_destroy(&obj->base, NULL); 239 240 drm_gem_free_mmap_offset(&obj->base); 241 242 if (obj->ops->release) 243 obj->ops->release(obj); 244 245 /* But keep the pointer alive for RCU-protected lookups */ 246 call_rcu(&obj->rcu, __i915_gem_free_object_rcu); 247 cond_resched(); 248 } 249 } 250 251 void i915_gem_flush_free_objects(struct drm_i915_private *i915) 252 { 253 struct llist_node *freed = llist_del_all(&i915->mm.free_list); 254 255 if (unlikely(freed)) 256 __i915_gem_free_objects(i915, freed); 257 } 258 259 static void __i915_gem_free_work(struct work_struct *work) 260 { 261 struct drm_i915_private *i915 = 262 container_of(work, struct drm_i915_private, mm.free_work); 263 264 i915_gem_flush_free_objects(i915); 265 } 266 267 void i915_gem_free_object(struct drm_gem_object *gem_obj) 268 { 269 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); 270 struct drm_i915_private *i915 = to_i915(obj->base.dev); 271 272 GEM_BUG_ON(i915_gem_object_is_framebuffer(obj)); 273 274 /* 275 * Before we free the object, make sure any pure RCU-only 276 * read-side critical sections are complete, e.g. 277 * i915_gem_busy_ioctl(). For the corresponding synchronized 278 * lookup see i915_gem_object_lookup_rcu(). 279 */ 280 atomic_inc(&i915->mm.free_count); 281 282 /* 283 * This serializes freeing with the shrinker. Since the free 284 * is delayed, first by RCU then by the workqueue, we want the 285 * shrinker to be able to free pages of unreferenced objects, 286 * or else we may oom whilst there are plenty of deferred 287 * freed objects. 288 */ 289 i915_gem_object_make_unshrinkable(obj); 290 291 /* 292 * Since we require blocking on struct_mutex to unbind the freed 293 * object from the GPU before releasing resources back to the 294 * system, we can not do that directly from the RCU callback (which may 295 * be a softirq context), but must instead then defer that work onto a 296 * kthread. We use the RCU callback rather than move the freed object 297 * directly onto the work queue so that we can mix between using the 298 * worker and performing frees directly from subsequent allocations for 299 * crude but effective memory throttling. 300 */ 301 if (llist_add(&obj->freed, &i915->mm.free_list)) 302 queue_work(i915->wq, &i915->mm.free_work); 303 } 304 305 static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj) 306 { 307 return !(obj->cache_level == I915_CACHE_NONE || 308 obj->cache_level == I915_CACHE_WT); 309 } 310 311 void 312 i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj, 313 unsigned int flush_domains) 314 { 315 struct i915_vma *vma; 316 317 assert_object_held(obj); 318 319 if (!(obj->write_domain & flush_domains)) 320 return; 321 322 switch (obj->write_domain) { 323 case I915_GEM_DOMAIN_GTT: 324 spin_lock(&obj->vma.lock); 325 for_each_ggtt_vma(vma, obj) { 326 if (i915_vma_unset_ggtt_write(vma)) 327 intel_gt_flush_ggtt_writes(vma->vm->gt); 328 } 329 spin_unlock(&obj->vma.lock); 330 331 i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU); 332 break; 333 334 case I915_GEM_DOMAIN_WC: 335 wmb(); 336 break; 337 338 case I915_GEM_DOMAIN_CPU: 339 i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC); 340 break; 341 342 case I915_GEM_DOMAIN_RENDER: 343 if (gpu_write_needs_clflush(obj)) 344 obj->cache_dirty = true; 345 break; 346 } 347 348 obj->write_domain = 0; 349 } 350 351 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj, 352 enum fb_op_origin origin) 353 { 354 struct intel_frontbuffer *front; 355 356 front = __intel_frontbuffer_get(obj); 357 if (front) { 358 intel_frontbuffer_flush(front, origin); 359 intel_frontbuffer_put(front); 360 } 361 } 362 363 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, 364 enum fb_op_origin origin) 365 { 366 struct intel_frontbuffer *front; 367 368 front = __intel_frontbuffer_get(obj); 369 if (front) { 370 intel_frontbuffer_invalidate(front, origin); 371 intel_frontbuffer_put(front); 372 } 373 } 374 375 void i915_gem_init__objects(struct drm_i915_private *i915) 376 { 377 INIT_WORK(&i915->mm.free_work, __i915_gem_free_work); 378 } 379 380 static void i915_global_objects_shrink(void) 381 { 382 kmem_cache_shrink(global.slab_objects); 383 } 384 385 static void i915_global_objects_exit(void) 386 { 387 kmem_cache_destroy(global.slab_objects); 388 } 389 390 static struct i915_global_object global = { { 391 .shrink = i915_global_objects_shrink, 392 .exit = i915_global_objects_exit, 393 } }; 394 395 int __init i915_global_objects_init(void) 396 { 397 global.slab_objects = 398 KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN); 399 if (!global.slab_objects) 400 return -ENOMEM; 401 402 i915_global_register(&global.base); 403 return 0; 404 } 405 406 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) 407 #include "selftests/huge_gem_object.c" 408 #include "selftests/huge_pages.c" 409 #include "selftests/i915_gem_object.c" 410 #include "selftests/i915_gem_coherency.c" 411 #endif 412