blob: 290eaa7fc9eb9243524b4be6818242fe5a47715c [file] [log] [blame]
Joonas Lahtinenb42fe9c2016-11-11 12:43:54 +02001/*
2 * Copyright © 2016 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#ifndef __I915_GEM_OBJECT_H__
26#define __I915_GEM_OBJECT_H__
27
28#include <linux/reservation.h>
29
30#include <drm/drm_vma_manager.h>
31#include <drm/drm_gem.h>
32#include <drm/drmP.h>
33
34#include <drm/i915_drm.h>
35
36struct drm_i915_gem_object_ops {
37 unsigned int flags;
38#define I915_GEM_OBJECT_HAS_STRUCT_PAGE 0x1
39#define I915_GEM_OBJECT_IS_SHRINKABLE 0x2
40
41 /* Interface between the GEM object and its backing storage.
42 * get_pages() is called once prior to the use of the associated set
43 * of pages before to binding them into the GTT, and put_pages() is
44 * called after we no longer need them. As we expect there to be
45 * associated cost with migrating pages between the backing storage
46 * and making them available for the GPU (e.g. clflush), we may hold
47 * onto the pages after they are no longer referenced by the GPU
48 * in case they may be used again shortly (for example migrating the
49 * pages to a different memory domain within the GTT). put_pages()
50 * will therefore most likely be called when the object itself is
51 * being released or under memory pressure (where we attempt to
52 * reap pages for the shrinker).
53 */
54 struct sg_table *(*get_pages)(struct drm_i915_gem_object *);
55 void (*put_pages)(struct drm_i915_gem_object *, struct sg_table *);
56
57 int (*dmabuf_export)(struct drm_i915_gem_object *);
58 void (*release)(struct drm_i915_gem_object *);
59};
60
61struct drm_i915_gem_object {
62 struct drm_gem_object base;
63
64 const struct drm_i915_gem_object_ops *ops;
65
66 /** List of VMAs backed by this object */
67 struct list_head vma_list;
68 struct rb_root vma_tree;
69
70 /** Stolen memory for this object, instead of being backed by shmem. */
71 struct drm_mm_node *stolen;
72 struct list_head global_link;
73 union {
74 struct rcu_head rcu;
75 struct llist_node freed;
76 };
77
78 /**
79 * Whether the object is currently in the GGTT mmap.
80 */
81 struct list_head userfault_link;
82
83 /** Used in execbuf to temporarily hold a ref */
84 struct list_head obj_exec_link;
85
86 struct list_head batch_pool_link;
87
88 unsigned long flags;
89
90 /**
91 * Have we taken a reference for the object for incomplete GPU
92 * activity?
93 */
94#define I915_BO_ACTIVE_REF 0
95
96 /*
97 * Is the object to be mapped as read-only to the GPU
98 * Only honoured if hardware has relevant pte bit
99 */
100 unsigned long gt_ro:1;
101 unsigned int cache_level:3;
102 unsigned int cache_dirty:1;
103
104 atomic_t frontbuffer_bits;
105 unsigned int frontbuffer_ggtt_origin; /* write once */
Chris Wilson5b8c8ae2016-11-16 19:07:04 +0000106 struct i915_gem_active frontbuffer_write;
Joonas Lahtinenb42fe9c2016-11-11 12:43:54 +0200107
108 /** Current tiling stride for the object, if it's tiled. */
109 unsigned int tiling_and_stride;
110#define FENCE_MINIMUM_STRIDE 128 /* See i915_tiling_ok() */
111#define TILING_MASK (FENCE_MINIMUM_STRIDE-1)
112#define STRIDE_MASK (~TILING_MASK)
113
114 /** Count of VMA actually bound by this object */
115 unsigned int bind_count;
116 unsigned int active_count;
117 unsigned int pin_display;
118
119 struct {
120 struct mutex lock; /* protects the pages and their use */
121 atomic_t pages_pin_count;
122
123 struct sg_table *pages;
124 void *mapping;
125
126 struct i915_gem_object_page_iter {
127 struct scatterlist *sg_pos;
128 unsigned int sg_idx; /* in pages, but 32bit eek! */
129
130 struct radix_tree_root radix;
131 struct mutex lock; /* protects this cache */
132 } get_page;
133
134 /**
135 * Advice: are the backing pages purgeable?
136 */
137 unsigned int madv:2;
138
139 /**
140 * This is set if the object has been written to since the
141 * pages were last acquired.
142 */
143 bool dirty:1;
144
145 /**
146 * This is set if the object has been pinned due to unknown
147 * swizzling.
148 */
149 bool quirked:1;
150 } mm;
151
152 /** Breadcrumb of last rendering to the buffer.
153 * There can only be one writer, but we allow for multiple readers.
154 * If there is a writer that necessarily implies that all other
155 * read requests are complete - but we may only be lazily clearing
156 * the read requests. A read request is naturally the most recent
157 * request on a ring, so we may have two different write and read
158 * requests on one ring where the write request is older than the
159 * read request. This allows for the CPU to read from an active
160 * buffer by only waiting for the write to complete.
161 */
162 struct reservation_object *resv;
163
164 /** References from framebuffers, locks out tiling changes. */
165 unsigned long framebuffer_references;
166
167 /** Record of address bit 17 of each page at last unbind. */
168 unsigned long *bit_17;
169
170 struct i915_gem_userptr {
171 uintptr_t ptr;
172 unsigned read_only :1;
173
174 struct i915_mm_struct *mm;
175 struct i915_mmu_object *mmu_object;
176 struct work_struct *work;
177 } userptr;
178
179 /** for phys allocated objects */
180 struct drm_dma_handle *phys_handle;
181
182 struct reservation_object __builtin_resv;
183};
184
185static inline struct drm_i915_gem_object *
186to_intel_bo(struct drm_gem_object *gem)
187{
188 /* Assert that to_intel_bo(NULL) == NULL */
189 BUILD_BUG_ON(offsetof(struct drm_i915_gem_object, base));
190
191 return container_of(gem, struct drm_i915_gem_object, base);
192}
193
194/**
195 * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
196 * @filp: DRM file private date
197 * @handle: userspace handle
198 *
199 * Returns:
200 *
201 * A pointer to the object named by the handle if such exists on @filp, NULL
202 * otherwise. This object is only valid whilst under the RCU read lock, and
203 * note carefully the object may be in the process of being destroyed.
204 */
205static inline struct drm_i915_gem_object *
206i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
207{
208#ifdef CONFIG_LOCKDEP
209 WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
210#endif
211 return idr_find(&file->object_idr, handle);
212}
213
214static inline struct drm_i915_gem_object *
215i915_gem_object_lookup(struct drm_file *file, u32 handle)
216{
217 struct drm_i915_gem_object *obj;
218
219 rcu_read_lock();
220 obj = i915_gem_object_lookup_rcu(file, handle);
221 if (obj && !kref_get_unless_zero(&obj->base.refcount))
222 obj = NULL;
223 rcu_read_unlock();
224
225 return obj;
226}
227
228__deprecated
229extern struct drm_gem_object *
230drm_gem_object_lookup(struct drm_file *file, u32 handle);
231
232__attribute__((nonnull))
233static inline struct drm_i915_gem_object *
234i915_gem_object_get(struct drm_i915_gem_object *obj)
235{
236 drm_gem_object_reference(&obj->base);
237 return obj;
238}
239
240__deprecated
241extern void drm_gem_object_reference(struct drm_gem_object *);
242
243__attribute__((nonnull))
244static inline void
245i915_gem_object_put(struct drm_i915_gem_object *obj)
246{
247 __drm_gem_object_unreference(&obj->base);
248}
249
250__deprecated
251extern void drm_gem_object_unreference(struct drm_gem_object *);
252
253__deprecated
254extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);
255
256static inline bool
257i915_gem_object_is_dead(const struct drm_i915_gem_object *obj)
258{
259 return atomic_read(&obj->base.refcount.refcount) == 0;
260}
261
262static inline bool
263i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
264{
265 return obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE;
266}
267
268static inline bool
269i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
270{
271 return obj->ops->flags & I915_GEM_OBJECT_IS_SHRINKABLE;
272}
273
274static inline bool
275i915_gem_object_is_active(const struct drm_i915_gem_object *obj)
276{
277 return obj->active_count;
278}
279
280static inline bool
281i915_gem_object_has_active_reference(const struct drm_i915_gem_object *obj)
282{
283 return test_bit(I915_BO_ACTIVE_REF, &obj->flags);
284}
285
286static inline void
287i915_gem_object_set_active_reference(struct drm_i915_gem_object *obj)
288{
289 lockdep_assert_held(&obj->base.dev->struct_mutex);
290 __set_bit(I915_BO_ACTIVE_REF, &obj->flags);
291}
292
293static inline void
294i915_gem_object_clear_active_reference(struct drm_i915_gem_object *obj)
295{
296 lockdep_assert_held(&obj->base.dev->struct_mutex);
297 __clear_bit(I915_BO_ACTIVE_REF, &obj->flags);
298}
299
300void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj);
301
302static inline unsigned int
303i915_gem_object_get_tiling(struct drm_i915_gem_object *obj)
304{
305 return obj->tiling_and_stride & TILING_MASK;
306}
307
308static inline bool
309i915_gem_object_is_tiled(struct drm_i915_gem_object *obj)
310{
311 return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
312}
313
314static inline unsigned int
315i915_gem_object_get_stride(struct drm_i915_gem_object *obj)
316{
317 return obj->tiling_and_stride & STRIDE_MASK;
318}
319
Chris Wilson6649a0b2017-01-09 16:16:08 +0000320static inline unsigned int
321i915_gem_tile_height(unsigned int tiling)
322{
323 GEM_BUG_ON(!tiling);
324 return tiling == I915_TILING_Y ? 32 : 8;
325}
326
327static inline unsigned int
328i915_gem_object_get_tile_height(struct drm_i915_gem_object *obj)
329{
330 return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
331}
332
333static inline unsigned int
334i915_gem_object_get_tile_row_size(struct drm_i915_gem_object *obj)
335{
336 return (i915_gem_object_get_stride(obj) *
337 i915_gem_object_get_tile_height(obj));
338}
339
Chris Wilson957870f2017-01-10 12:10:45 +0000340int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
341 unsigned int tiling, unsigned int stride);
342
Joonas Lahtinenb42fe9c2016-11-11 12:43:54 +0200343static inline struct intel_engine_cs *
344i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
345{
346 struct intel_engine_cs *engine = NULL;
347 struct dma_fence *fence;
348
349 rcu_read_lock();
350 fence = reservation_object_get_excl_rcu(obj->resv);
351 rcu_read_unlock();
352
353 if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
354 engine = to_request(fence)->engine;
355 dma_fence_put(fence);
356
357 return engine;
358}
359
360#endif
361