2 * SPDX-License-Identifier: MIT
4 * Copyright © 2016 Intel Corporation
7 #ifndef __I915_GEM_OBJECT_TYPES_H__
8 #define __I915_GEM_OBJECT_TYPES_H__
10 #include <drm/drm_gem.h>
11 #include <uapi/drm/i915_drm.h>
13 #include "i915_active.h"
14 #include "i915_selftest.h"
16 struct drm_i915_gem_object;
17 struct intel_fronbuffer;
20 * struct i915_lut_handle tracks the fast lookups from handle to vma used
21 * for execbuf. Although we use a radixtree for that mapping, in order to
22 * remove them as the object or context is closed, we need a secondary list
23 * and a translation entry (i915_lut_handle).
25 struct i915_lut_handle {
26 struct list_head obj_link;
27 struct i915_gem_context *ctx;
31 struct drm_i915_gem_object_ops {
33 #define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0)
34 #define I915_GEM_OBJECT_HAS_IOMEM BIT(1)
35 #define I915_GEM_OBJECT_IS_SHRINKABLE BIT(2)
36 #define I915_GEM_OBJECT_IS_PROXY BIT(3)
37 #define I915_GEM_OBJECT_NO_MMAP BIT(4)
38 #define I915_GEM_OBJECT_ASYNC_CANCEL BIT(5)
40 /* Interface between the GEM object and its backing storage.
41 * get_pages() is called once prior to the use of the associated set
42 * of pages before to binding them into the GTT, and put_pages() is
43 * called after we no longer need them. As we expect there to be
44 * associated cost with migrating pages between the backing storage
45 * and making them available for the GPU (e.g. clflush), we may hold
46 * onto the pages after they are no longer referenced by the GPU
47 * in case they may be used again shortly (for example migrating the
48 * pages to a different memory domain within the GTT). put_pages()
49 * will therefore most likely be called when the object itself is
50 * being released or under memory pressure (where we attempt to
51 * reap pages for the shrinker).
53 int (*get_pages)(struct drm_i915_gem_object *obj);
54 void (*put_pages)(struct drm_i915_gem_object *obj,
55 struct sg_table *pages);
56 void (*truncate)(struct drm_i915_gem_object *obj);
57 void (*writeback)(struct drm_i915_gem_object *obj);
59 int (*pread)(struct drm_i915_gem_object *obj,
60 const struct drm_i915_gem_pread *arg);
61 int (*pwrite)(struct drm_i915_gem_object *obj,
62 const struct drm_i915_gem_pwrite *arg);
64 int (*dmabuf_export)(struct drm_i915_gem_object *obj);
65 void (*release)(struct drm_i915_gem_object *obj);
67 const char *name; /* friendly name for debug, e.g. lockdep classes */
71 I915_MMAP_TYPE_GTT = 0,
77 struct i915_mmap_offset {
78 struct drm_vma_offset_node vma_node;
79 struct drm_i915_gem_object *obj;
80 enum i915_mmap_type mmap_type;
82 struct rb_node offset;
85 struct i915_gem_object_page_iter {
86 struct scatterlist *sg_pos;
87 unsigned int sg_idx; /* in pages, but 32bit eek! */
89 struct radix_tree_root radix;
90 struct mutex lock; /* protects this cache */
93 struct drm_i915_gem_object {
94 struct drm_gem_object base;
96 const struct drm_i915_gem_object_ops *ops;
100 * @vma.lock: protect the list/tree of vmas
105 * @vma.list: List of VMAs backed by this object
107 * The VMA on this list are ordered by type, all GGTT vma are
108 * placed at the head and all ppGTT vma are placed at the tail.
109 * The different types of GGTT vma are unordered between
110 * themselves, use the @vma.tree (which has a defined order
111 * between all VMA) to quickly find an exact match.
113 struct list_head list;
116 * @vma.tree: Ordered tree of VMAs backed by this object
118 * All VMA created for this object are placed in the @vma.tree
119 * for fast retrieval via a binary search in
120 * i915_vma_instance(). They are also added to @vma.list for
127 * @lut_list: List of vma lookup entries in use for this object.
129 * If this object is closed, we need to remove all of its VMA from
130 * the fast lookup index in associated contexts; @lut_list provides
131 * this translation from object to context->handles_vma.
133 struct list_head lut_list;
134 spinlock_t lut_lock; /* guards lut_list */
137 * @obj_link: Link into @i915_gem_ww_ctx.obj_list
139 * When we lock this object through i915_gem_object_lock() with a
140 * context, we add it to the list to ensure we can unlock everything
141 * when i915_gem_ww_ctx_backoff() or i915_gem_ww_ctx_fini() are called.
143 struct list_head obj_link;
145 /** Stolen memory for this object, instead of being backed by shmem. */
146 struct drm_mm_node *stolen;
149 struct llist_node freed;
153 * Whether the object is currently in the GGTT mmap.
155 unsigned int userfault_count;
156 struct list_head userfault_link;
159 spinlock_t lock; /* Protects access to mmo offsets */
160 struct rb_root offsets;
163 I915_SELFTEST_DECLARE(struct list_head st_link);
166 #define I915_BO_ALLOC_CONTIGUOUS BIT(0)
167 #define I915_BO_ALLOC_VOLATILE BIT(1)
168 #define I915_BO_ALLOC_FLAGS (I915_BO_ALLOC_CONTIGUOUS | I915_BO_ALLOC_VOLATILE)
169 #define I915_BO_READONLY BIT(2)
172 * Is the object to be mapped as read-only to the GPU
173 * Only honoured if hardware has relevant pte bit
175 unsigned int cache_level:3;
176 unsigned int cache_coherent:2;
177 #define I915_BO_CACHE_COHERENT_FOR_READ BIT(0)
178 #define I915_BO_CACHE_COHERENT_FOR_WRITE BIT(1)
179 unsigned int cache_dirty:1;
182 * @read_domains: Read memory domains.
184 * These monitor which caches contain read/write data related to the
185 * object. When transitioning from one set of domains to another,
186 * the driver is called to ensure that caches are suitably flushed and
192 * @write_domain: Corresponding unique write memory domain.
196 struct intel_frontbuffer __rcu *frontbuffer;
198 /** Current tiling stride for the object, if it's tiled. */
199 unsigned int tiling_and_stride;
200 #define FENCE_MINIMUM_STRIDE 128 /* See i915_tiling_ok() */
201 #define TILING_MASK (FENCE_MINIMUM_STRIDE - 1)
202 #define STRIDE_MASK (~TILING_MASK)
206 * Protects the pages and their use. Do not use directly, but
207 * instead go through the pin/unpin interfaces.
210 atomic_t pages_pin_count;
214 * Memory region for this object.
216 struct intel_memory_region *region;
218 * List of memory region blocks allocated for this object.
220 struct list_head blocks;
222 * Element within memory_region->objects or region->purgeable
223 * if the object is marked as DONTNEED. Access is protected by
226 struct list_head region_link;
228 struct sg_table *pages;
231 struct i915_page_sizes {
233 * The sg mask of the pages sg_table. i.e the mask of
234 * of the lengths for each sg entry.
239 * The gtt page sizes we are allowed to use given the
240 * sg mask and the supported page sizes. This will
241 * express the smallest unit we can use for the whole
242 * object, as well as the larger sizes we may be able
243 * to use opportunistically.
248 * The actual gtt page size usage. Since we can have
249 * multiple vma associated with this object we need to
250 * prevent any trampling of state, hence a copy of this
251 * struct also lives in each vma, therefore the gtt
252 * value here should only be read/write through the vma.
257 I915_SELFTEST_DECLARE(unsigned int page_mask);
259 struct i915_gem_object_page_iter get_page;
260 struct i915_gem_object_page_iter get_dma_page;
263 * Element within i915->mm.unbound_list or i915->mm.bound_list,
264 * locked by i915->mm.obj_lock.
266 struct list_head link;
269 * Advice: are the backing pages purgeable?
274 * This is set if the object has been written to since the
275 * pages were last acquired.
280 * This is set if the object has been pinned due to unknown
286 /** Record of address bit 17 of each page at last unbind. */
287 unsigned long *bit_17;
290 struct i915_gem_userptr {
293 struct i915_mm_struct *mm;
294 struct i915_mmu_object *mmu_object;
295 struct work_struct *work;
298 unsigned long scratch;
305 static inline struct drm_i915_gem_object *
306 to_intel_bo(struct drm_gem_object *gem)
308 /* Assert that to_intel_bo(NULL) == NULL */
309 BUILD_BUG_ON(offsetof(struct drm_i915_gem_object, base));
311 return container_of(gem, struct drm_i915_gem_object, base);