1 /*
2  * SPDX-License-Identifier: MIT
3  *
4  * Copyright © 2016 Intel Corporation
5  */
6 
7 #ifndef __I915_GEM_OBJECT_H__
8 #define __I915_GEM_OBJECT_H__
9 
10 #include <drm/drm_gem.h>
11 #include <drm/drm_file.h>
12 #include <drm/drm_device.h>
13 
14 #include "display/intel_frontbuffer.h"
15 #include "i915_gem_object_types.h"
16 #include "i915_gem_gtt.h"
17 #include "i915_vma_types.h"
18 
19 void i915_gem_init__objects(struct drm_i915_private *i915);
20 
21 struct drm_i915_gem_object *i915_gem_object_alloc(void);
22 void i915_gem_object_free(struct drm_i915_gem_object *obj);
23 
24 void i915_gem_object_init(struct drm_i915_gem_object *obj,
25 			  const struct drm_i915_gem_object_ops *ops,
26 			  struct lock_class_key *key);
27 struct drm_i915_gem_object *
28 i915_gem_object_create_shmem(struct drm_i915_private *i915,
29 			     resource_size_t size);
30 struct drm_i915_gem_object *
31 i915_gem_object_create_shmem_from_data(struct drm_i915_private *i915,
32 				       const void *data, resource_size_t size);
33 
34 extern const struct drm_i915_gem_object_ops i915_gem_shmem_ops;
35 void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
36 				     struct sg_table *pages,
37 				     bool needs_clflush);
38 
39 int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align);
40 
41 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
42 void i915_gem_free_object(struct drm_gem_object *obj);
43 
44 void i915_gem_flush_free_objects(struct drm_i915_private *i915);
45 
46 struct sg_table *
47 __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj);
48 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
49 
50 /**
51  * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
52  * @filp: DRM file private date
53  * @handle: userspace handle
54  *
55  * Returns:
56  *
57  * A pointer to the object named by the handle if such exists on @filp, NULL
58  * otherwise. This object is only valid whilst under the RCU read lock, and
59  * note carefully the object may be in the process of being destroyed.
60  */
61 static inline struct drm_i915_gem_object *
62 i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
63 {
64 #ifdef CONFIG_LOCKDEP
65 	WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
66 #endif
67 	return idr_find(&file->object_idr, handle);
68 }
69 
70 static inline struct drm_i915_gem_object *
71 i915_gem_object_get_rcu(struct drm_i915_gem_object *obj)
72 {
73 	if (obj && !kref_get_unless_zero(&obj->base.refcount))
74 		obj = NULL;
75 
76 	return obj;
77 }
78 
79 static inline struct drm_i915_gem_object *
80 i915_gem_object_lookup(struct drm_file *file, u32 handle)
81 {
82 	struct drm_i915_gem_object *obj;
83 
84 	rcu_read_lock();
85 	obj = i915_gem_object_lookup_rcu(file, handle);
86 	obj = i915_gem_object_get_rcu(obj);
87 	rcu_read_unlock();
88 
89 	return obj;
90 }
91 
92 __deprecated
93 struct drm_gem_object *
94 drm_gem_object_lookup(struct drm_file *file, u32 handle);
95 
96 __attribute__((nonnull))
97 static inline struct drm_i915_gem_object *
98 i915_gem_object_get(struct drm_i915_gem_object *obj)
99 {
100 	drm_gem_object_get(&obj->base);
101 	return obj;
102 }
103 
104 __attribute__((nonnull))
105 static inline void
106 i915_gem_object_put(struct drm_i915_gem_object *obj)
107 {
108 	__drm_gem_object_put(&obj->base);
109 }
110 
111 #define assert_object_held(obj) dma_resv_assert_held((obj)->base.resv)
112 
113 static inline void i915_gem_object_lock(struct drm_i915_gem_object *obj)
114 {
115 	dma_resv_lock(obj->base.resv, NULL);
116 }
117 
118 static inline bool i915_gem_object_trylock(struct drm_i915_gem_object *obj)
119 {
120 	return dma_resv_trylock(obj->base.resv);
121 }
122 
123 static inline int
124 i915_gem_object_lock_interruptible(struct drm_i915_gem_object *obj)
125 {
126 	return dma_resv_lock_interruptible(obj->base.resv, NULL);
127 }
128 
129 static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
130 {
131 	dma_resv_unlock(obj->base.resv);
132 }
133 
134 struct dma_fence *
135 i915_gem_object_lock_fence(struct drm_i915_gem_object *obj);
136 void i915_gem_object_unlock_fence(struct drm_i915_gem_object *obj,
137 				  struct dma_fence *fence);
138 
139 static inline void
140 i915_gem_object_set_readonly(struct drm_i915_gem_object *obj)
141 {
142 	obj->flags |= I915_BO_READONLY;
143 }
144 
145 static inline bool
146 i915_gem_object_is_readonly(const struct drm_i915_gem_object *obj)
147 {
148 	return obj->flags & I915_BO_READONLY;
149 }
150 
151 static inline bool
152 i915_gem_object_is_contiguous(const struct drm_i915_gem_object *obj)
153 {
154 	return obj->flags & I915_BO_ALLOC_CONTIGUOUS;
155 }
156 
157 static inline bool
158 i915_gem_object_is_volatile(const struct drm_i915_gem_object *obj)
159 {
160 	return obj->flags & I915_BO_ALLOC_VOLATILE;
161 }
162 
163 static inline void
164 i915_gem_object_set_volatile(struct drm_i915_gem_object *obj)
165 {
166 	obj->flags |= I915_BO_ALLOC_VOLATILE;
167 }
168 
169 static inline bool
170 i915_gem_object_type_has(const struct drm_i915_gem_object *obj,
171 			 unsigned long flags)
172 {
173 	return obj->ops->flags & flags;
174 }
175 
176 static inline bool
177 i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
178 {
179 	return i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_STRUCT_PAGE);
180 }
181 
182 static inline bool
183 i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
184 {
185 	return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE);
186 }
187 
188 static inline bool
189 i915_gem_object_is_proxy(const struct drm_i915_gem_object *obj)
190 {
191 	return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_PROXY);
192 }
193 
194 static inline bool
195 i915_gem_object_never_mmap(const struct drm_i915_gem_object *obj)
196 {
197 	return i915_gem_object_type_has(obj, I915_GEM_OBJECT_NO_MMAP);
198 }
199 
200 static inline bool
201 i915_gem_object_needs_async_cancel(const struct drm_i915_gem_object *obj)
202 {
203 	return i915_gem_object_type_has(obj, I915_GEM_OBJECT_ASYNC_CANCEL);
204 }
205 
206 static inline bool
207 i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
208 {
209 	return READ_ONCE(obj->frontbuffer);
210 }
211 
212 static inline unsigned int
213 i915_gem_object_get_tiling(const struct drm_i915_gem_object *obj)
214 {
215 	return obj->tiling_and_stride & TILING_MASK;
216 }
217 
218 static inline bool
219 i915_gem_object_is_tiled(const struct drm_i915_gem_object *obj)
220 {
221 	return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
222 }
223 
224 static inline unsigned int
225 i915_gem_object_get_stride(const struct drm_i915_gem_object *obj)
226 {
227 	return obj->tiling_and_stride & STRIDE_MASK;
228 }
229 
230 static inline unsigned int
231 i915_gem_tile_height(unsigned int tiling)
232 {
233 	GEM_BUG_ON(!tiling);
234 	return tiling == I915_TILING_Y ? 32 : 8;
235 }
236 
237 static inline unsigned int
238 i915_gem_object_get_tile_height(const struct drm_i915_gem_object *obj)
239 {
240 	return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
241 }
242 
243 static inline unsigned int
244 i915_gem_object_get_tile_row_size(const struct drm_i915_gem_object *obj)
245 {
246 	return (i915_gem_object_get_stride(obj) *
247 		i915_gem_object_get_tile_height(obj));
248 }
249 
250 int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
251 			       unsigned int tiling, unsigned int stride);
252 
253 struct scatterlist *
254 i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
255 		       unsigned int n, unsigned int *offset);
256 
257 struct page *
258 i915_gem_object_get_page(struct drm_i915_gem_object *obj,
259 			 unsigned int n);
260 
261 struct page *
262 i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
263 			       unsigned int n);
264 
265 dma_addr_t
266 i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
267 				    unsigned long n,
268 				    unsigned int *len);
269 
270 dma_addr_t
271 i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
272 				unsigned long n);
273 
274 void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
275 				 struct sg_table *pages,
276 				 unsigned int sg_page_sizes);
277 
278 int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
279 int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
280 
281 enum i915_mm_subclass { /* lockdep subclass for obj->mm.lock/struct_mutex */
282 	I915_MM_NORMAL = 0,
283 	/*
284 	 * Only used by struct_mutex, when called "recursively" from
285 	 * direct-reclaim-esque. Safe because there is only every one
286 	 * struct_mutex in the entire system.
287 	 */
288 	I915_MM_SHRINKER = 1,
289 	/*
290 	 * Used for obj->mm.lock when allocating pages. Safe because the object
291 	 * isn't yet on any LRU, and therefore the shrinker can't deadlock on
292 	 * it. As soon as the object has pages, obj->mm.lock nests within
293 	 * fs_reclaim.
294 	 */
295 	I915_MM_GET_PAGES = 1,
296 };
297 
298 static inline int __must_check
299 i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
300 {
301 	might_lock_nested(&obj->mm.lock, I915_MM_GET_PAGES);
302 
303 	if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
304 		return 0;
305 
306 	return __i915_gem_object_get_pages(obj);
307 }
308 
309 static inline bool
310 i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
311 {
312 	return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));
313 }
314 
315 static inline void
316 __i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
317 {
318 	GEM_BUG_ON(!i915_gem_object_has_pages(obj));
319 
320 	atomic_inc(&obj->mm.pages_pin_count);
321 }
322 
323 static inline bool
324 i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj)
325 {
326 	return atomic_read(&obj->mm.pages_pin_count);
327 }
328 
329 static inline void
330 __i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
331 {
332 	GEM_BUG_ON(!i915_gem_object_has_pages(obj));
333 	GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
334 
335 	atomic_dec(&obj->mm.pages_pin_count);
336 }
337 
338 static inline void
339 i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
340 {
341 	__i915_gem_object_unpin_pages(obj);
342 }
343 
344 int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
345 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
346 void i915_gem_object_writeback(struct drm_i915_gem_object *obj);
347 
348 enum i915_map_type {
349 	I915_MAP_WB = 0,
350 	I915_MAP_WC,
351 #define I915_MAP_OVERRIDE BIT(31)
352 	I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
353 	I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
354 };
355 
356 /**
357  * i915_gem_object_pin_map - return a contiguous mapping of the entire object
358  * @obj: the object to map into kernel address space
359  * @type: the type of mapping, used to select pgprot_t
360  *
361  * Calls i915_gem_object_pin_pages() to prevent reaping of the object's
362  * pages and then returns a contiguous mapping of the backing storage into
363  * the kernel address space. Based on the @type of mapping, the PTE will be
364  * set to either WriteBack or WriteCombine (via pgprot_t).
365  *
366  * The caller is responsible for calling i915_gem_object_unpin_map() when the
367  * mapping is no longer required.
368  *
369  * Returns the pointer through which to access the mapped object, or an
370  * ERR_PTR() on error.
371  */
372 void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
373 					   enum i915_map_type type);
374 
375 void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
376 				 unsigned long offset,
377 				 unsigned long size);
378 static inline void i915_gem_object_flush_map(struct drm_i915_gem_object *obj)
379 {
380 	__i915_gem_object_flush_map(obj, 0, obj->base.size);
381 }
382 
383 /**
384  * i915_gem_object_unpin_map - releases an earlier mapping
385  * @obj: the object to unmap
386  *
387  * After pinning the object and mapping its pages, once you are finished
388  * with your access, call i915_gem_object_unpin_map() to release the pin
389  * upon the mapping. Once the pin count reaches zero, that mapping may be
390  * removed.
391  */
392 static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
393 {
394 	i915_gem_object_unpin_pages(obj);
395 }
396 
397 void
398 i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
399 				   unsigned int flush_domains);
400 
401 int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
402 				 unsigned int *needs_clflush);
403 int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
404 				  unsigned int *needs_clflush);
405 #define CLFLUSH_BEFORE	BIT(0)
406 #define CLFLUSH_AFTER	BIT(1)
407 #define CLFLUSH_FLAGS	(CLFLUSH_BEFORE | CLFLUSH_AFTER)
408 
409 static inline void
410 i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
411 {
412 	i915_gem_object_unpin_pages(obj);
413 	i915_gem_object_unlock(obj);
414 }
415 
416 static inline struct intel_engine_cs *
417 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
418 {
419 	struct intel_engine_cs *engine = NULL;
420 	struct dma_fence *fence;
421 
422 	rcu_read_lock();
423 	fence = dma_resv_get_excl_rcu(obj->base.resv);
424 	rcu_read_unlock();
425 
426 	if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
427 		engine = to_request(fence)->engine;
428 	dma_fence_put(fence);
429 
430 	return engine;
431 }
432 
433 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
434 					 unsigned int cache_level);
435 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
436 
437 int __must_check
438 i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
439 int __must_check
440 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write);
441 int __must_check
442 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
443 struct i915_vma * __must_check
444 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
445 				     u32 alignment,
446 				     const struct i915_ggtt_view *view,
447 				     unsigned int flags);
448 void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);
449 
450 void i915_gem_object_make_unshrinkable(struct drm_i915_gem_object *obj);
451 void i915_gem_object_make_shrinkable(struct drm_i915_gem_object *obj);
452 void i915_gem_object_make_purgeable(struct drm_i915_gem_object *obj);
453 
454 static inline bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
455 {
456 	if (obj->cache_dirty)
457 		return false;
458 
459 	if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
460 		return true;
461 
462 	/* Currently in use by HW (display engine)? Keep flushed. */
463 	return i915_gem_object_is_framebuffer(obj);
464 }
465 
466 static inline void __start_cpu_write(struct drm_i915_gem_object *obj)
467 {
468 	obj->read_domains = I915_GEM_DOMAIN_CPU;
469 	obj->write_domain = I915_GEM_DOMAIN_CPU;
470 	if (cpu_write_needs_clflush(obj))
471 		obj->cache_dirty = true;
472 }
473 
474 int i915_gem_object_wait(struct drm_i915_gem_object *obj,
475 			 unsigned int flags,
476 			 long timeout);
477 int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
478 				  unsigned int flags,
479 				  const struct i915_sched_attr *attr);
480 
481 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
482 					 enum fb_op_origin origin);
483 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
484 					      enum fb_op_origin origin);
485 
486 static inline void
487 i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
488 				  enum fb_op_origin origin)
489 {
490 	if (unlikely(rcu_access_pointer(obj->frontbuffer)))
491 		__i915_gem_object_flush_frontbuffer(obj, origin);
492 }
493 
494 static inline void
495 i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
496 				       enum fb_op_origin origin)
497 {
498 	if (unlikely(rcu_access_pointer(obj->frontbuffer)))
499 		__i915_gem_object_invalidate_frontbuffer(obj, origin);
500 }
501 
502 #endif
503