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 "display/intel_frontbuffer.h"
26 #include "gt/intel_gt.h"
27 #include "i915_drv.h"
28 #include "i915_gem_clflush.h"
29 #include "i915_gem_context.h"
30 #include "i915_gem_object.h"
31 #include "i915_globals.h"
32 #include "i915_trace.h"
33
34 static struct i915_global_object {
35 struct i915_global base;
36 struct kmem_cache *slab_objects;
37 } global;
38
i915_gem_object_alloc(void)39 struct drm_i915_gem_object *i915_gem_object_alloc(void)
40 {
41 return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
42 }
43
i915_gem_object_free(struct drm_i915_gem_object * obj)44 void i915_gem_object_free(struct drm_i915_gem_object *obj)
45 {
46 return kmem_cache_free(global.slab_objects, obj);
47 }
48
i915_gem_object_init(struct drm_i915_gem_object * obj,const struct drm_i915_gem_object_ops * ops)49 void i915_gem_object_init(struct drm_i915_gem_object *obj,
50 const struct drm_i915_gem_object_ops *ops)
51 {
52 mutex_init(&obj->mm.lock);
53
54 spin_lock_init(&obj->vma.lock);
55 INIT_LIST_HEAD(&obj->vma.list);
56
57 INIT_LIST_HEAD(&obj->mm.link);
58
59 INIT_LIST_HEAD(&obj->lut_list);
60
61 init_rcu_head(&obj->rcu);
62
63 obj->ops = ops;
64
65 obj->mm.madv = I915_MADV_WILLNEED;
66 INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
67 mutex_init(&obj->mm.get_page.lock);
68 }
69
70 /**
71 * Mark up the object's coherency levels for a given cache_level
72 * @obj: #drm_i915_gem_object
73 * @cache_level: cache level
74 */
i915_gem_object_set_cache_coherency(struct drm_i915_gem_object * obj,unsigned int cache_level)75 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
76 unsigned int cache_level)
77 {
78 obj->cache_level = cache_level;
79
80 if (cache_level != I915_CACHE_NONE)
81 obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ |
82 I915_BO_CACHE_COHERENT_FOR_WRITE);
83 else if (HAS_LLC(to_i915(obj->base.dev)))
84 obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
85 else
86 obj->cache_coherent = 0;
87
88 obj->cache_dirty =
89 !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
90 }
91
i915_gem_close_object(struct drm_gem_object * gem,struct drm_file * file)92 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
93 {
94 struct drm_i915_gem_object *obj = to_intel_bo(gem);
95 struct drm_i915_file_private *fpriv = file->driver_priv;
96 struct i915_lut_handle *lut, *ln;
97 LIST_HEAD(close);
98
99 i915_gem_object_lock(obj);
100 list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
101 struct i915_gem_context *ctx = lut->ctx;
102
103 if (ctx->file_priv != fpriv)
104 continue;
105
106 i915_gem_context_get(ctx);
107 list_move(&lut->obj_link, &close);
108 }
109 i915_gem_object_unlock(obj);
110
111 list_for_each_entry_safe(lut, ln, &close, obj_link) {
112 struct i915_gem_context *ctx = lut->ctx;
113 struct i915_vma *vma;
114
115 /*
116 * We allow the process to have multiple handles to the same
117 * vma, in the same fd namespace, by virtue of flink/open.
118 */
119
120 mutex_lock(&ctx->mutex);
121 vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
122 if (vma) {
123 GEM_BUG_ON(vma->obj != obj);
124 GEM_BUG_ON(!atomic_read(&vma->open_count));
125 if (atomic_dec_and_test(&vma->open_count) &&
126 !i915_vma_is_ggtt(vma))
127 i915_vma_close(vma);
128 }
129 mutex_unlock(&ctx->mutex);
130
131 i915_gem_context_put(lut->ctx);
132 i915_lut_handle_free(lut);
133 i915_gem_object_put(obj);
134 }
135 }
136
__i915_gem_free_object_rcu(struct rcu_head * head)137 static void __i915_gem_free_object_rcu(struct rcu_head *head)
138 {
139 struct drm_i915_gem_object *obj =
140 container_of(head, typeof(*obj), rcu);
141 struct drm_i915_private *i915 = to_i915(obj->base.dev);
142
143 dma_resv_fini(&obj->base._resv);
144 i915_gem_object_free(obj);
145
146 GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
147 atomic_dec(&i915->mm.free_count);
148 }
149
__i915_gem_free_objects(struct drm_i915_private * i915,struct llist_node * freed)150 static void __i915_gem_free_objects(struct drm_i915_private *i915,
151 struct llist_node *freed)
152 {
153 struct drm_i915_gem_object *obj, *on;
154 intel_wakeref_t wakeref;
155
156 wakeref = intel_runtime_pm_get(&i915->runtime_pm);
157 llist_for_each_entry_safe(obj, on, freed, freed) {
158 struct i915_vma *vma, *vn;
159
160 trace_i915_gem_object_destroy(obj);
161
162 mutex_lock(&i915->drm.struct_mutex);
163
164 list_for_each_entry_safe(vma, vn, &obj->vma.list, obj_link) {
165 GEM_BUG_ON(i915_vma_is_active(vma));
166 vma->flags &= ~I915_VMA_PIN_MASK;
167 i915_vma_destroy(vma);
168 }
169 GEM_BUG_ON(!list_empty(&obj->vma.list));
170 GEM_BUG_ON(!RB_EMPTY_ROOT(&obj->vma.tree));
171
172 mutex_unlock(&i915->drm.struct_mutex);
173
174 GEM_BUG_ON(atomic_read(&obj->bind_count));
175 GEM_BUG_ON(obj->userfault_count);
176 GEM_BUG_ON(!list_empty(&obj->lut_list));
177
178 atomic_set(&obj->mm.pages_pin_count, 0);
179 __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
180 GEM_BUG_ON(i915_gem_object_has_pages(obj));
181 bitmap_free(obj->bit_17);
182
183 if (obj->base.import_attach)
184 drm_prime_gem_destroy(&obj->base, NULL);
185
186 drm_gem_free_mmap_offset(&obj->base);
187
188 if (obj->ops->release)
189 obj->ops->release(obj);
190
191 /* But keep the pointer alive for RCU-protected lookups */
192 call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
193 }
194 intel_runtime_pm_put(&i915->runtime_pm, wakeref);
195 }
196
i915_gem_flush_free_objects(struct drm_i915_private * i915)197 void i915_gem_flush_free_objects(struct drm_i915_private *i915)
198 {
199 struct llist_node *freed = llist_del_all(&i915->mm.free_list);
200
201 if (unlikely(freed))
202 __i915_gem_free_objects(i915, freed);
203 }
204
__i915_gem_free_work(struct work_struct * work)205 static void __i915_gem_free_work(struct work_struct *work)
206 {
207 struct drm_i915_private *i915 =
208 container_of(work, struct drm_i915_private, mm.free_work);
209
210 i915_gem_flush_free_objects(i915);
211 }
212
i915_gem_free_object(struct drm_gem_object * gem_obj)213 void i915_gem_free_object(struct drm_gem_object *gem_obj)
214 {
215 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
216 struct drm_i915_private *i915 = to_i915(obj->base.dev);
217
218 GEM_BUG_ON(i915_gem_object_is_framebuffer(obj));
219
220 /*
221 * Before we free the object, make sure any pure RCU-only
222 * read-side critical sections are complete, e.g.
223 * i915_gem_busy_ioctl(). For the corresponding synchronized
224 * lookup see i915_gem_object_lookup_rcu().
225 */
226 atomic_inc(&i915->mm.free_count);
227
228 /*
229 * This serializes freeing with the shrinker. Since the free
230 * is delayed, first by RCU then by the workqueue, we want the
231 * shrinker to be able to free pages of unreferenced objects,
232 * or else we may oom whilst there are plenty of deferred
233 * freed objects.
234 */
235 i915_gem_object_make_unshrinkable(obj);
236
237 /*
238 * Since we require blocking on struct_mutex to unbind the freed
239 * object from the GPU before releasing resources back to the
240 * system, we can not do that directly from the RCU callback (which may
241 * be a softirq context), but must instead then defer that work onto a
242 * kthread. We use the RCU callback rather than move the freed object
243 * directly onto the work queue so that we can mix between using the
244 * worker and performing frees directly from subsequent allocations for
245 * crude but effective memory throttling.
246 */
247 if (llist_add(&obj->freed, &i915->mm.free_list))
248 queue_work(i915->wq, &i915->mm.free_work);
249 }
250
gpu_write_needs_clflush(struct drm_i915_gem_object * obj)251 static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
252 {
253 return !(obj->cache_level == I915_CACHE_NONE ||
254 obj->cache_level == I915_CACHE_WT);
255 }
256
257 void
i915_gem_object_flush_write_domain(struct drm_i915_gem_object * obj,unsigned int flush_domains)258 i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
259 unsigned int flush_domains)
260 {
261 struct i915_vma *vma;
262
263 assert_object_held(obj);
264
265 if (!(obj->write_domain & flush_domains))
266 return;
267
268 switch (obj->write_domain) {
269 case I915_GEM_DOMAIN_GTT:
270 for_each_ggtt_vma(vma, obj)
271 intel_gt_flush_ggtt_writes(vma->vm->gt);
272
273 intel_frontbuffer_flush(obj->frontbuffer, ORIGIN_CPU);
274
275 for_each_ggtt_vma(vma, obj) {
276 if (vma->iomap)
277 continue;
278
279 i915_vma_unset_ggtt_write(vma);
280 }
281
282 break;
283
284 case I915_GEM_DOMAIN_WC:
285 wmb();
286 break;
287
288 case I915_GEM_DOMAIN_CPU:
289 i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
290 break;
291
292 case I915_GEM_DOMAIN_RENDER:
293 if (gpu_write_needs_clflush(obj))
294 obj->cache_dirty = true;
295 break;
296 }
297
298 obj->write_domain = 0;
299 }
300
i915_gem_init__objects(struct drm_i915_private * i915)301 void i915_gem_init__objects(struct drm_i915_private *i915)
302 {
303 INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
304 }
305
i915_global_objects_shrink(void)306 static void i915_global_objects_shrink(void)
307 {
308 kmem_cache_shrink(global.slab_objects);
309 }
310
i915_global_objects_exit(void)311 static void i915_global_objects_exit(void)
312 {
313 kmem_cache_destroy(global.slab_objects);
314 }
315
316 static struct i915_global_object global = { {
317 .shrink = i915_global_objects_shrink,
318 .exit = i915_global_objects_exit,
319 } };
320
i915_global_objects_init(void)321 int __init i915_global_objects_init(void)
322 {
323 global.slab_objects =
324 KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
325 if (!global.slab_objects)
326 return -ENOMEM;
327
328 i915_global_register(&global.base);
329 return 0;
330 }
331
332 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
333 #include "selftests/huge_gem_object.c"
334 #include "selftests/huge_pages.c"
335 #include "selftests/i915_gem_object.c"
336 #include "selftests/i915_gem_coherency.c"
337 #endif
338
