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25 #ifndef __I915_GEM_OBJECT_H__
26 #define __I915_GEM_OBJECT_H__
28 #include <linux/reservation.h>
30 #include <drm/drm_vma_manager.h>
31 #include <drm/drm_gem.h>
34 #include <drm/i915_drm.h>
36 #include "i915_selftest.h"
38 struct drm_i915_gem_object_ops {
40 #define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0)
41 #define I915_GEM_OBJECT_IS_SHRINKABLE BIT(1)
43 /* Interface between the GEM object and its backing storage.
44 * get_pages() is called once prior to the use of the associated set
45 * of pages before to binding them into the GTT, and put_pages() is
46 * called after we no longer need them. As we expect there to be
47 * associated cost with migrating pages between the backing storage
48 * and making them available for the GPU (e.g. clflush), we may hold
49 * onto the pages after they are no longer referenced by the GPU
50 * in case they may be used again shortly (for example migrating the
51 * pages to a different memory domain within the GTT). put_pages()
52 * will therefore most likely be called when the object itself is
53 * being released or under memory pressure (where we attempt to
54 * reap pages for the shrinker).
56 struct sg_table *(*get_pages)(struct drm_i915_gem_object *);
57 void (*put_pages)(struct drm_i915_gem_object *, struct sg_table *);
59 int (*pwrite)(struct drm_i915_gem_object *,
60 const struct drm_i915_gem_pwrite *);
62 int (*dmabuf_export)(struct drm_i915_gem_object *);
63 void (*release)(struct drm_i915_gem_object *);
66 struct drm_i915_gem_object {
67 struct drm_gem_object base;
69 const struct drm_i915_gem_object_ops *ops;
72 * @vma_list: List of VMAs backed by this object
74 * The VMA on this list are ordered by type, all GGTT vma are placed
75 * at the head and all ppGTT vma are placed at the tail. The different
76 * types of GGTT vma are unordered between themselves, use the
77 * @vma_tree (which has a defined order between all VMA) to find an
80 struct list_head vma_list;
82 * @vma_tree: Ordered tree of VMAs backed by this object
84 * All VMA created for this object are placed in the @vma_tree for
85 * fast retrieval via a binary search in i915_vma_instance().
86 * They are also added to @vma_list for easy iteration.
88 struct rb_root vma_tree;
90 /** Stolen memory for this object, instead of being backed by shmem. */
91 struct drm_mm_node *stolen;
92 struct list_head global_link;
95 struct llist_node freed;
99 * Whether the object is currently in the GGTT mmap.
101 struct list_head userfault_link;
103 /** Used in execbuf to temporarily hold a ref */
104 struct list_head obj_exec_link;
106 struct list_head batch_pool_link;
107 I915_SELFTEST_DECLARE(struct list_head st_link);
112 * Have we taken a reference for the object for incomplete GPU
115 #define I915_BO_ACTIVE_REF 0
118 * Is the object to be mapped as read-only to the GPU
119 * Only honoured if hardware has relevant pte bit
121 unsigned long gt_ro:1;
122 unsigned int cache_level:3;
123 unsigned int cache_dirty:1;
125 atomic_t frontbuffer_bits;
126 unsigned int frontbuffer_ggtt_origin; /* write once */
127 struct i915_gem_active frontbuffer_write;
129 /** Current tiling stride for the object, if it's tiled. */
130 unsigned int tiling_and_stride;
131 #define FENCE_MINIMUM_STRIDE 128 /* See i915_tiling_ok() */
132 #define TILING_MASK (FENCE_MINIMUM_STRIDE-1)
133 #define STRIDE_MASK (~TILING_MASK)
135 /** Count of VMA actually bound by this object */
136 unsigned int bind_count;
137 unsigned int active_count;
138 unsigned int pin_display;
141 struct mutex lock; /* protects the pages and their use */
142 atomic_t pages_pin_count;
144 struct sg_table *pages;
147 struct i915_gem_object_page_iter {
148 struct scatterlist *sg_pos;
149 unsigned int sg_idx; /* in pages, but 32bit eek! */
151 struct radix_tree_root radix;
152 struct mutex lock; /* protects this cache */
156 * Advice: are the backing pages purgeable?
161 * This is set if the object has been written to since the
162 * pages were last acquired.
167 * This is set if the object has been pinned due to unknown
173 /** Breadcrumb of last rendering to the buffer.
174 * There can only be one writer, but we allow for multiple readers.
175 * If there is a writer that necessarily implies that all other
176 * read requests are complete - but we may only be lazily clearing
177 * the read requests. A read request is naturally the most recent
178 * request on a ring, so we may have two different write and read
179 * requests on one ring where the write request is older than the
180 * read request. This allows for the CPU to read from an active
181 * buffer by only waiting for the write to complete.
183 struct reservation_object *resv;
185 /** References from framebuffers, locks out tiling changes. */
186 unsigned int framebuffer_references;
188 /** Record of address bit 17 of each page at last unbind. */
189 unsigned long *bit_17;
192 struct i915_gem_userptr {
194 unsigned read_only :1;
196 struct i915_mm_struct *mm;
197 struct i915_mmu_object *mmu_object;
198 struct work_struct *work;
201 unsigned long scratch;
204 /** for phys allocated objects */
205 struct drm_dma_handle *phys_handle;
207 struct reservation_object __builtin_resv;
210 static inline struct drm_i915_gem_object *
211 to_intel_bo(struct drm_gem_object *gem)
213 /* Assert that to_intel_bo(NULL) == NULL */
214 BUILD_BUG_ON(offsetof(struct drm_i915_gem_object, base));
216 return container_of(gem, struct drm_i915_gem_object, base);
220 * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
221 * @filp: DRM file private date
222 * @handle: userspace handle
226 * A pointer to the object named by the handle if such exists on @filp, NULL
227 * otherwise. This object is only valid whilst under the RCU read lock, and
228 * note carefully the object may be in the process of being destroyed.
230 static inline struct drm_i915_gem_object *
231 i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
233 #ifdef CONFIG_LOCKDEP
234 WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
236 return idr_find(&file->object_idr, handle);
239 static inline struct drm_i915_gem_object *
240 i915_gem_object_lookup(struct drm_file *file, u32 handle)
242 struct drm_i915_gem_object *obj;
245 obj = i915_gem_object_lookup_rcu(file, handle);
246 if (obj && !kref_get_unless_zero(&obj->base.refcount))
254 extern struct drm_gem_object *
255 drm_gem_object_lookup(struct drm_file *file, u32 handle);
257 __attribute__((nonnull))
258 static inline struct drm_i915_gem_object *
259 i915_gem_object_get(struct drm_i915_gem_object *obj)
261 drm_gem_object_reference(&obj->base);
266 extern void drm_gem_object_reference(struct drm_gem_object *);
268 __attribute__((nonnull))
270 i915_gem_object_put(struct drm_i915_gem_object *obj)
272 __drm_gem_object_unreference(&obj->base);
276 extern void drm_gem_object_unreference(struct drm_gem_object *);
279 extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);
281 static inline void i915_gem_object_lock(struct drm_i915_gem_object *obj)
283 reservation_object_lock(obj->resv, NULL);
286 static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
288 reservation_object_unlock(obj->resv);
292 i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
294 return obj->ops->flags & I915_GEM_OBJECT_HAS_STRUCT_PAGE;
298 i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
300 return obj->ops->flags & I915_GEM_OBJECT_IS_SHRINKABLE;
304 i915_gem_object_is_active(const struct drm_i915_gem_object *obj)
306 return obj->active_count;
310 i915_gem_object_has_active_reference(const struct drm_i915_gem_object *obj)
312 return test_bit(I915_BO_ACTIVE_REF, &obj->flags);
316 i915_gem_object_set_active_reference(struct drm_i915_gem_object *obj)
318 lockdep_assert_held(&obj->base.dev->struct_mutex);
319 __set_bit(I915_BO_ACTIVE_REF, &obj->flags);
323 i915_gem_object_clear_active_reference(struct drm_i915_gem_object *obj)
325 lockdep_assert_held(&obj->base.dev->struct_mutex);
326 __clear_bit(I915_BO_ACTIVE_REF, &obj->flags);
329 void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj);
332 i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
334 return READ_ONCE(obj->framebuffer_references);
337 static inline unsigned int
338 i915_gem_object_get_tiling(struct drm_i915_gem_object *obj)
340 return obj->tiling_and_stride & TILING_MASK;
344 i915_gem_object_is_tiled(struct drm_i915_gem_object *obj)
346 return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
349 static inline unsigned int
350 i915_gem_object_get_stride(struct drm_i915_gem_object *obj)
352 return obj->tiling_and_stride & STRIDE_MASK;
355 static inline unsigned int
356 i915_gem_tile_height(unsigned int tiling)
359 return tiling == I915_TILING_Y ? 32 : 8;
362 static inline unsigned int
363 i915_gem_object_get_tile_height(struct drm_i915_gem_object *obj)
365 return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
368 static inline unsigned int
369 i915_gem_object_get_tile_row_size(struct drm_i915_gem_object *obj)
371 return (i915_gem_object_get_stride(obj) *
372 i915_gem_object_get_tile_height(obj));
375 int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
376 unsigned int tiling, unsigned int stride);
378 static inline struct intel_engine_cs *
379 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
381 struct intel_engine_cs *engine = NULL;
382 struct dma_fence *fence;
385 fence = reservation_object_get_excl_rcu(obj->resv);
388 if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
389 engine = to_request(fence)->engine;
390 dma_fence_put(fence);
395 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);