1 /* $NetBSD: i915_gem_object.c,v 1.9 2021/12/19 12:12:31 riastradh Exp $ */ 2 3 /* 4 * Copyright 2017 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 23 * IN THE SOFTWARE. 24 * 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: i915_gem_object.c,v 1.9 2021/12/19 12:12:31 riastradh Exp $"); 29 30 #include <linux/bitmap.h> 31 #include <linux/sched/mm.h> 32 33 #include "display/intel_frontbuffer.h" 34 #include "gt/intel_gt.h" 35 #include "i915_drv.h" 36 #include "i915_gem_clflush.h" 37 #include "i915_gem_context.h" 38 #include "i915_gem_mman.h" 39 #include "i915_gem_object.h" 40 #include "i915_globals.h" 41 #include "i915_trace.h" 42 43 #include <linux/nbsd-namespace.h> 44 45 static struct i915_global_object { 46 struct i915_global base; 47 struct kmem_cache *slab_objects; 48 } global; 49 50 struct drm_i915_gem_object *i915_gem_object_alloc(void) 51 { 52 return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL); 53 } 54 55 void i915_gem_object_free(struct drm_i915_gem_object *obj) 56 { 57 return kmem_cache_free(global.slab_objects, obj); 58 } 59 60 void i915_gem_object_init(struct drm_i915_gem_object *obj, 61 const struct drm_i915_gem_object_ops *ops, 62 struct lock_class_key *key) 63 { 64 __mutex_init(&obj->mm.lock, "obj->mm.lock", key); 65 66 spin_lock_init(&obj->vma.lock); 67 INIT_LIST_HEAD(&obj->vma.list); 68 i915_vma_tree_init(obj); 69 70 INIT_LIST_HEAD(&obj->mm.link); 71 72 INIT_LIST_HEAD(&obj->lut_list); 73 74 spin_lock_init(&obj->mmo.lock); 75 #ifdef __NetBSD__ 76 memset(obj->mmo.offsets, 0, sizeof(obj->mmo.offsets)); 77 #else 78 obj->mmo.offsets = RB_ROOT; 79 #endif 80 81 init_rcu_head(&obj->rcu); 82 83 obj->ops = ops; 84 85 obj->mm.madv = I915_MADV_WILLNEED; 86 #ifndef __NetBSD__ 87 INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN); 88 mutex_init(&obj->mm.get_page.lock); 89 #endif 90 } 91 92 /** 93 * Mark up the object's coherency levels for a given cache_level 94 * @obj: #drm_i915_gem_object 95 * @cache_level: cache level 96 */ 97 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj, 98 unsigned int cache_level) 99 { 100 obj->cache_level = cache_level; 101 102 if (cache_level != I915_CACHE_NONE) 103 obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ | 104 I915_BO_CACHE_COHERENT_FOR_WRITE); 105 else if (HAS_LLC(to_i915(obj->base.dev))) 106 obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ; 107 else 108 obj->cache_coherent = 0; 109 110 obj->cache_dirty = 111 !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE); 112 } 113 114 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file) 115 { 116 struct drm_i915_gem_object *obj = to_intel_bo(gem); 117 struct drm_i915_file_private *fpriv = file->driver_priv; 118 struct i915_mmap_offset *mmo, *mn; 119 struct i915_lut_handle *lut, *ln; 120 LIST_HEAD(close); 121 122 i915_gem_object_lock(obj); 123 list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) { 124 struct i915_gem_context *ctx = lut->ctx; 125 126 if (ctx->file_priv != fpriv) 127 continue; 128 129 i915_gem_context_get(ctx); 130 list_move(&lut->obj_link, &close); 131 } 132 i915_gem_object_unlock(obj); 133 134 #ifdef __NetBSD__ 135 __USE(mn); 136 for (enum i915_mmap_type t = 0; t < I915_MMAP_NTYPES; t++) { 137 if ((mmo = obj->mmo.offsets[t]) == NULL) 138 continue; 139 drm_vma_node_revoke(&mmo->vma_node, file); 140 } 141 #else 142 spin_lock(&obj->mmo.lock); 143 rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset) 144 drm_vma_node_revoke(&mmo->vma_node, file); 145 spin_unlock(&obj->mmo.lock); 146 #endif 147 148 list_for_each_entry_safe(lut, ln, &close, obj_link) { 149 struct i915_gem_context *ctx = lut->ctx; 150 struct i915_vma *vma; 151 152 /* 153 * We allow the process to have multiple handles to the same 154 * vma, in the same fd namespace, by virtue of flink/open. 155 */ 156 157 mutex_lock(&ctx->mutex); 158 vma = radix_tree_delete(&ctx->handles_vma, lut->handle); 159 if (vma) { 160 GEM_BUG_ON(vma->obj != obj); 161 GEM_BUG_ON(!atomic_read(&vma->open_count)); 162 if (atomic_dec_and_test(&vma->open_count) && 163 !i915_vma_is_ggtt(vma)) 164 i915_vma_close(vma); 165 } 166 mutex_unlock(&ctx->mutex); 167 168 i915_gem_context_put(lut->ctx); 169 i915_lut_handle_free(lut); 170 i915_gem_object_put(obj); 171 } 172 } 173 174 static void __i915_gem_free_object_rcu(struct rcu_head *head) 175 { 176 struct drm_i915_gem_object *obj = 177 container_of(head, typeof(*obj), rcu); 178 struct drm_i915_private *i915 = to_i915(obj->base.dev); 179 180 /* i915_gem_object_init */ 181 spin_lock_destroy(&obj->mmo.lock); 182 spin_lock_destroy(&obj->vma.lock); 183 mutex_destroy(&obj->mm.lock); 184 185 dma_resv_fini(&obj->base._resv); 186 drm_vma_node_destroy(&obj->base.vma_node); 187 i915_gem_object_free(obj); 188 189 GEM_BUG_ON(!atomic_read(&i915->mm.free_count)); 190 atomic_dec(&i915->mm.free_count); 191 } 192 193 static void __i915_gem_free_objects(struct drm_i915_private *i915, 194 struct llist_node *freed) 195 { 196 struct drm_i915_gem_object *obj, *on; 197 intel_wakeref_t wakeref; 198 199 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 200 llist_for_each_entry_safe(obj, on, freed, freed) { 201 struct i915_mmap_offset *mmo, *mn; 202 203 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_release_mmap(obj); 229 230 #ifdef __NetBSD__ 231 __USE(mn); 232 for (enum i915_mmap_type t = 0; t < I915_MMAP_NTYPES; t++) { 233 if ((mmo = obj->mmo.offsets[t]) == NULL) 234 continue; 235 drm_vma_offset_remove(obj->base.dev->vma_offset_manager, 236 &mmo->vma_node); 237 drm_vma_node_destroy(&mmo->vma_node); 238 kfree(mmo); 239 } 240 memset(obj->mmo.offsets, 0, sizeof(obj->mmo.offsets)); 241 #else 242 rbtree_postorder_for_each_entry_safe(mmo, mn, 243 &obj->mmo.offsets, 244 offset) { 245 drm_vma_offset_remove(obj->base.dev->vma_offset_manager, 246 &mmo->vma_node); 247 kfree(mmo); 248 } 249 obj->mmo.offsets = RB_ROOT; 250 #endif 251 252 GEM_BUG_ON(atomic_read(&obj->bind_count)); 253 GEM_BUG_ON(obj->userfault_count); 254 GEM_BUG_ON(!list_empty(&obj->lut_list)); 255 256 atomic_set(&obj->mm.pages_pin_count, 0); 257 __i915_gem_object_put_pages(obj); 258 GEM_BUG_ON(i915_gem_object_has_pages(obj)); 259 bitmap_free(obj->bit_17); 260 261 if (obj->base.import_attach) 262 drm_prime_gem_destroy(&obj->base, NULL); 263 264 drm_gem_free_mmap_offset(&obj->base); 265 266 if (obj->ops->release) 267 obj->ops->release(obj); 268 269 /* But keep the pointer alive for RCU-protected lookups */ 270 call_rcu(&obj->rcu, __i915_gem_free_object_rcu); 271 } 272 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 273 } 274 275 void i915_gem_flush_free_objects(struct drm_i915_private *i915) 276 { 277 struct llist_node *freed = llist_del_all(&i915->mm.free_list); 278 279 if (unlikely(freed)) 280 __i915_gem_free_objects(i915, freed); 281 } 282 283 static void __i915_gem_free_work(struct work_struct *work) 284 { 285 struct drm_i915_private *i915 = 286 container_of(work, struct drm_i915_private, mm.free_work); 287 288 i915_gem_flush_free_objects(i915); 289 } 290 291 void i915_gem_free_object(struct drm_gem_object *gem_obj) 292 { 293 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); 294 struct drm_i915_private *i915 = to_i915(obj->base.dev); 295 296 GEM_BUG_ON(i915_gem_object_is_framebuffer(obj)); 297 298 /* 299 * Before we free the object, make sure any pure RCU-only 300 * read-side critical sections are complete, e.g. 301 * i915_gem_busy_ioctl(). For the corresponding synchronized 302 * lookup see i915_gem_object_lookup_rcu(). 303 */ 304 atomic_inc(&i915->mm.free_count); 305 306 /* 307 * This serializes freeing with the shrinker. Since the free 308 * is delayed, first by RCU then by the workqueue, we want the 309 * shrinker to be able to free pages of unreferenced objects, 310 * or else we may oom whilst there are plenty of deferred 311 * freed objects. 312 */ 313 i915_gem_object_make_unshrinkable(obj); 314 315 /* 316 * Since we require blocking on struct_mutex to unbind the freed 317 * object from the GPU before releasing resources back to the 318 * system, we can not do that directly from the RCU callback (which may 319 * be a softirq context), but must instead then defer that work onto a 320 * kthread. We use the RCU callback rather than move the freed object 321 * directly onto the work queue so that we can mix between using the 322 * worker and performing frees directly from subsequent allocations for 323 * crude but effective memory throttling. 324 */ 325 if (llist_add(&obj->freed, &i915->mm.free_list)) 326 queue_work(i915->wq, &i915->mm.free_work); 327 } 328 329 static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj) 330 { 331 return !(obj->cache_level == I915_CACHE_NONE || 332 obj->cache_level == I915_CACHE_WT); 333 } 334 335 void 336 i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj, 337 unsigned int flush_domains) 338 { 339 struct i915_vma *vma; 340 341 assert_object_held(obj); 342 343 if (!(obj->write_domain & flush_domains)) 344 return; 345 346 switch (obj->write_domain) { 347 case I915_GEM_DOMAIN_GTT: 348 spin_lock(&obj->vma.lock); 349 for_each_ggtt_vma(vma, obj) { 350 if (i915_vma_unset_ggtt_write(vma)) 351 intel_gt_flush_ggtt_writes(vma->vm->gt); 352 } 353 spin_unlock(&obj->vma.lock); 354 355 i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU); 356 break; 357 358 case I915_GEM_DOMAIN_WC: 359 wmb(); 360 break; 361 362 case I915_GEM_DOMAIN_CPU: 363 i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC); 364 break; 365 366 case I915_GEM_DOMAIN_RENDER: 367 if (gpu_write_needs_clflush(obj)) 368 obj->cache_dirty = true; 369 break; 370 } 371 372 obj->write_domain = 0; 373 } 374 375 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj, 376 enum fb_op_origin origin) 377 { 378 struct intel_frontbuffer *front; 379 380 front = __intel_frontbuffer_get(obj); 381 if (front) { 382 intel_frontbuffer_flush(front, origin); 383 intel_frontbuffer_put(front); 384 } 385 } 386 387 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, 388 enum fb_op_origin origin) 389 { 390 struct intel_frontbuffer *front; 391 392 front = __intel_frontbuffer_get(obj); 393 if (front) { 394 intel_frontbuffer_invalidate(front, origin); 395 intel_frontbuffer_put(front); 396 } 397 } 398 399 void i915_gem_init__objects(struct drm_i915_private *i915) 400 { 401 INIT_WORK(&i915->mm.free_work, __i915_gem_free_work); 402 } 403 404 static void i915_global_objects_shrink(void) 405 { 406 kmem_cache_shrink(global.slab_objects); 407 } 408 409 static void i915_global_objects_exit(void) 410 { 411 kmem_cache_destroy(global.slab_objects); 412 } 413 414 static struct i915_global_object global = { { 415 .shrink = i915_global_objects_shrink, 416 .exit = i915_global_objects_exit, 417 } }; 418 419 int __init i915_global_objects_init(void) 420 { 421 global.slab_objects = 422 KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN); 423 if (!global.slab_objects) 424 return -ENOMEM; 425 426 i915_global_register(&global.base); 427 return 0; 428 } 429 430 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) 431 #include "selftests/huge_gem_object.c" 432 #include "selftests/huge_pages.c" 433 #include "selftests/i915_gem_object.c" 434 #include "selftests/i915_gem_coherency.c" 435 #endif 436
Indexes created Sat Sep 20 22:09:52 GMT 2025