drivers/gpu/drm/i915/i915_gem_object.h

   1 /*
   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
  36 struct 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
  61 struct 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 */
 106         struct i915_gem_active frontbuffer_write;
 107
 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
 185 static inline struct drm_i915_gem_object *
 186 to_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  */
 205 static inline struct drm_i915_gem_object *
 206 i915_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
 214 static inline struct drm_i915_gem_object *
 215 i915_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
 229 extern struct drm_gem_object *
 230 drm_gem_object_lookup(struct drm_file *file, u32 handle);
 231
 232 __attribute__((nonnull))
 233 static inline struct drm_i915_gem_object *
 234 i915_gem_object_get(struct drm_i915_gem_object *obj)
 235 {
 236         drm_gem_object_reference(&obj->base);
 237         return obj;
 238 }
 239
 240 __deprecated
 241 extern void drm_gem_object_reference(struct drm_gem_object *);
 242
 243 __attribute__((nonnull))
 244 static inline void
 245 i915_gem_object_put(struct drm_i915_gem_object *obj)
 246 {
 247         __drm_gem_object_unreference(&obj->base);
 248 }
 249
 250 __deprecated
 251 extern void drm_gem_object_unreference(struct drm_gem_object *);
 252
 253 __deprecated
 254 extern void drm_gem_object_unreference_unlocked(struct drm_gem_object *);
 255
 256 static inline bool
 257 i915_gem_object_is_dead(const struct drm_i915_gem_object *obj)
 258 {
 259         return kref_read(&obj->base.refcount) == 0;
 260 }
 261
 262 static inline bool
 263 i915_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
 268 static inline bool
 269 i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
 270 {
 271         return obj->ops->flags & I915_GEM_OBJECT_IS_SHRINKABLE;
 272 }
 273
 274 static inline bool
 275 i915_gem_object_is_active(const struct drm_i915_gem_object *obj)
 276 {
 277         return obj->active_count;
 278 }
 279
 280 static inline bool
 281 i915_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
 286 static inline void
 287 i915_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
 293 static inline void
 294 i915_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
 300 void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj);
 301
 302 static inline unsigned int
 303 i915_gem_object_get_tiling(struct drm_i915_gem_object *obj)
 304 {
 305         return obj->tiling_and_stride & TILING_MASK;
 306 }
 307
 308 static inline bool
 309 i915_gem_object_is_tiled(struct drm_i915_gem_object *obj)
 310 {
 311         return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
 312 }
 313
 314 static inline unsigned int
 315 i915_gem_object_get_stride(struct drm_i915_gem_object *obj)
 316 {
 317         return obj->tiling_and_stride & STRIDE_MASK;
 318 }
 319
 320 static inline unsigned int
 321 i915_gem_tile_height(unsigned int tiling)
 322 {
 323         GEM_BUG_ON(!tiling);
 324         return tiling == I915_TILING_Y ? 32 : 8;
 325 }
 326
 327 static inline unsigned int
 328 i915_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
 333 static inline unsigned int
 334 i915_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
 340 int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
 341                                unsigned int tiling, unsigned int stride);
 342
 343 static inline struct intel_engine_cs *
 344 i915_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