root/drivers/gpu/drm/i915/i915_vma.h

INCLUDED FROM

DEFINITIONS

1. i915_vma_is_active
2. i915_vma_is_ggtt
3. i915_vma_has_ggtt_write
4. i915_vma_set_ggtt_write
5. i915_vma_unset_ggtt_write
6. i915_vma_is_map_and_fenceable
7. i915_vma_set_userfault
8. i915_vma_unset_userfault
9. i915_vma_has_userfault
10. i915_vma_is_closed
11. i915_ggtt_offset
12. i915_ggtt_pin_bias
13. i915_vma_get
14. i915_vma_tryget
15. i915_vma_put
16. i915_vma_compare
17. i915_vma_lock
18. i915_vma_unlock
19. i915_vma_pin
20. i915_vma_pin_count
21. i915_vma_is_pinned
22. __i915_vma_pin
23. __i915_vma_unpin
24. i915_vma_unpin
25. i915_vma_is_bound
26. i915_vma_first_page
27. __i915_vma_unpin_fence
28. i915_vma_unpin_fence

   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_VMA_H__
  26 #define __I915_VMA_H__
  27 
  28 #include <linux/io-mapping.h>
  29 #include <linux/rbtree.h>
  30 
  31 #include <drm/drm_mm.h>
  32 
  33 #include "i915_gem_gtt.h"
  34 #include "i915_gem_fence_reg.h"
  35 #include "gem/i915_gem_object.h"
  36 
  37 #include "i915_active.h"
  38 #include "i915_request.h"
  39 
  40 enum i915_cache_level;
  41 
  42 /**
  43  * DOC: Virtual Memory Address
  44  *
  45  * A VMA represents a GEM BO that is bound into an address space. Therefore, a
  46  * VMA's presence cannot be guaranteed before binding, or after unbinding the
  47  * object into/from the address space.
  48  *
  49  * To make things as simple as possible (ie. no refcounting), a VMA's lifetime
  50  * will always be <= an objects lifetime. So object refcounting should cover us.
  51  */
  52 struct i915_vma {
  53         struct drm_mm_node node;
  54         struct drm_i915_gem_object *obj;
  55         struct i915_address_space *vm;
  56         const struct i915_vma_ops *ops;
  57         struct i915_fence_reg *fence;
  58         struct dma_resv *resv; /** Alias of obj->resv */
  59         struct sg_table *pages;
  60         void __iomem *iomap;
  61         void *private; /* owned by creator */
  62         u64 size;
  63         u64 display_alignment;
  64         struct i915_page_sizes page_sizes;
  65 
  66         u32 fence_size;
  67         u32 fence_alignment;
  68 
  69         /**
  70          * Count of the number of times this vma has been opened by different
  71          * handles (but same file) for execbuf, i.e. the number of aliases
  72          * that exist in the ctx->handle_vmas LUT for this vma.
  73          */
  74         atomic_t open_count;
  75         unsigned long flags;
  76         /**
  77          * How many users have pinned this object in GTT space.
  78          *
  79          * This is a tightly bound, fairly small number of users, so we
  80          * stuff inside the flags field so that we can both check for overflow
  81          * and detect a no-op i915_vma_pin() in a single check, while also
  82          * pinning the vma.
  83          *
  84          * The worst case display setup would have the same vma pinned for
  85          * use on each plane on each crtc, while also building the next atomic
  86          * state and holding a pin for the length of the cleanup queue. In the
  87          * future, the flip queue may be increased from 1.
  88          * Estimated worst case: 3 [qlen] * 4 [max crtcs] * 7 [max planes] = 84
  89          *
  90          * For GEM, the number of concurrent users for pwrite/pread is
  91          * unbounded. For execbuffer, it is currently one but will in future
  92          * be extended to allow multiple clients to pin vma concurrently.
  93          *
  94          * We also use suballocated pages, with each suballocation claiming
  95          * its own pin on the shared vma. At present, this is limited to
  96          * exclusive cachelines of a single page, so a maximum of 64 possible
  97          * users.
  98          */
  99 #define I915_VMA_PIN_MASK 0xff
 100 #define I915_VMA_PIN_OVERFLOW   BIT(8)
 101 
 102         /** Flags and address space this VMA is bound to */
 103 #define I915_VMA_GLOBAL_BIND    BIT(9)
 104 #define I915_VMA_LOCAL_BIND     BIT(10)
 105 #define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND | I915_VMA_PIN_OVERFLOW)
 106 
 107 #define I915_VMA_GGTT           BIT(11)
 108 #define I915_VMA_CAN_FENCE      BIT(12)
 109 #define I915_VMA_USERFAULT_BIT  13
 110 #define I915_VMA_USERFAULT      BIT(I915_VMA_USERFAULT_BIT)
 111 #define I915_VMA_GGTT_WRITE     BIT(14)
 112 
 113         struct i915_active active;
 114 
 115         /**
 116          * Support different GGTT views into the same object.
 117          * This means there can be multiple VMA mappings per object and per VM.
 118          * i915_ggtt_view_type is used to distinguish between those entries.
 119          * The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
 120          * assumed in GEM functions which take no ggtt view parameter.
 121          */
 122         struct i915_ggtt_view ggtt_view;
 123 
 124         /** This object's place on the active/inactive lists */
 125         struct list_head vm_link;
 126 
 127         struct list_head obj_link; /* Link in the object's VMA list */
 128         struct rb_node obj_node;
 129         struct hlist_node obj_hash;
 130 
 131         /** This vma's place in the execbuf reservation list */
 132         struct list_head exec_link;
 133         struct list_head reloc_link;
 134 
 135         /** This vma's place in the eviction list */
 136         struct list_head evict_link;
 137 
 138         struct list_head closed_link;
 139 
 140         /**
 141          * Used for performing relocations during execbuffer insertion.
 142          */
 143         unsigned int *exec_flags;
 144         struct hlist_node exec_node;
 145         u32 exec_handle;
 146 };
 147 
 148 struct i915_vma *
 149 i915_vma_instance(struct drm_i915_gem_object *obj,
 150                   struct i915_address_space *vm,
 151                   const struct i915_ggtt_view *view);
 152 
 153 void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags);
 154 #define I915_VMA_RELEASE_MAP BIT(0)
 155 
 156 static inline bool i915_vma_is_active(const struct i915_vma *vma)
 157 {
 158         return !i915_active_is_idle(&vma->active);
 159 }
 160 
 161 int __must_check i915_vma_move_to_active(struct i915_vma *vma,
 162                                          struct i915_request *rq,
 163                                          unsigned int flags);
 164 
 165 static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
 166 {
 167         return vma->flags & I915_VMA_GGTT;
 168 }
 169 
 170 static inline bool i915_vma_has_ggtt_write(const struct i915_vma *vma)
 171 {
 172         return vma->flags & I915_VMA_GGTT_WRITE;
 173 }
 174 
 175 static inline void i915_vma_set_ggtt_write(struct i915_vma *vma)
 176 {
 177         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 178         vma->flags |= I915_VMA_GGTT_WRITE;
 179 }
 180 
 181 static inline void i915_vma_unset_ggtt_write(struct i915_vma *vma)
 182 {
 183         vma->flags &= ~I915_VMA_GGTT_WRITE;
 184 }
 185 
 186 void i915_vma_flush_writes(struct i915_vma *vma);
 187 
 188 static inline bool i915_vma_is_map_and_fenceable(const struct i915_vma *vma)
 189 {
 190         return vma->flags & I915_VMA_CAN_FENCE;
 191 }
 192 
 193 static inline bool i915_vma_set_userfault(struct i915_vma *vma)
 194 {
 195         GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
 196         return __test_and_set_bit(I915_VMA_USERFAULT_BIT, &vma->flags);
 197 }
 198 
 199 static inline void i915_vma_unset_userfault(struct i915_vma *vma)
 200 {
 201         return __clear_bit(I915_VMA_USERFAULT_BIT, &vma->flags);
 202 }
 203 
 204 static inline bool i915_vma_has_userfault(const struct i915_vma *vma)
 205 {
 206         return test_bit(I915_VMA_USERFAULT_BIT, &vma->flags);
 207 }
 208 
 209 static inline bool i915_vma_is_closed(const struct i915_vma *vma)
 210 {
 211         return !list_empty(&vma->closed_link);
 212 }
 213 
 214 static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
 215 {
 216         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 217         GEM_BUG_ON(!vma->node.allocated);
 218         GEM_BUG_ON(upper_32_bits(vma->node.start));
 219         GEM_BUG_ON(upper_32_bits(vma->node.start + vma->node.size - 1));
 220         return lower_32_bits(vma->node.start);
 221 }
 222 
 223 static inline u32 i915_ggtt_pin_bias(struct i915_vma *vma)
 224 {
 225         return i915_vm_to_ggtt(vma->vm)->pin_bias;
 226 }
 227 
 228 static inline struct i915_vma *i915_vma_get(struct i915_vma *vma)
 229 {
 230         i915_gem_object_get(vma->obj);
 231         return vma;
 232 }
 233 
 234 static inline struct i915_vma *i915_vma_tryget(struct i915_vma *vma)
 235 {
 236         if (likely(kref_get_unless_zero(&vma->obj->base.refcount)))
 237                 return vma;
 238 
 239         return NULL;
 240 }
 241 
 242 static inline void i915_vma_put(struct i915_vma *vma)
 243 {
 244         i915_gem_object_put(vma->obj);
 245 }
 246 
 247 static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
 248 {
 249         return a - b;
 250 }
 251 
 252 static inline long
 253 i915_vma_compare(struct i915_vma *vma,
 254                  struct i915_address_space *vm,
 255                  const struct i915_ggtt_view *view)
 256 {
 257         ptrdiff_t cmp;
 258 
 259         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 260 
 261         cmp = ptrdiff(vma->vm, vm);
 262         if (cmp)
 263                 return cmp;
 264 
 265         BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL != 0);
 266         cmp = vma->ggtt_view.type;
 267         if (!view)
 268                 return cmp;
 269 
 270         cmp -= view->type;
 271         if (cmp)
 272                 return cmp;
 273 
 274         assert_i915_gem_gtt_types();
 275 
 276         /* ggtt_view.type also encodes its size so that we both distinguish
 277          * different views using it as a "type" and also use a compact (no
 278          * accessing of uninitialised padding bytes) memcmp without storing
 279          * an extra parameter or adding more code.
 280          *
 281          * To ensure that the memcmp is valid for all branches of the union,
 282          * even though the code looks like it is just comparing one branch,
 283          * we assert above that all branches have the same address, and that
 284          * each branch has a unique type/size.
 285          */
 286         BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
 287         BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
 288         BUILD_BUG_ON(I915_GGTT_VIEW_ROTATED >= I915_GGTT_VIEW_REMAPPED);
 289         BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
 290                      offsetof(typeof(*view), partial));
 291         BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
 292                      offsetof(typeof(*view), remapped));
 293         return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
 294 }
 295 
 296 int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
 297                   u32 flags);
 298 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level);
 299 bool i915_vma_misplaced(const struct i915_vma *vma,
 300                         u64 size, u64 alignment, u64 flags);
 301 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
 302 void i915_vma_revoke_mmap(struct i915_vma *vma);
 303 int __must_check i915_vma_unbind(struct i915_vma *vma);
 304 void i915_vma_unlink_ctx(struct i915_vma *vma);
 305 void i915_vma_close(struct i915_vma *vma);
 306 void i915_vma_reopen(struct i915_vma *vma);
 307 void i915_vma_destroy(struct i915_vma *vma);
 308 
 309 #define assert_vma_held(vma) dma_resv_assert_held((vma)->resv)
 310 
 311 static inline void i915_vma_lock(struct i915_vma *vma)
 312 {
 313         dma_resv_lock(vma->resv, NULL);
 314 }
 315 
 316 static inline void i915_vma_unlock(struct i915_vma *vma)
 317 {
 318         dma_resv_unlock(vma->resv);
 319 }
 320 
 321 int __i915_vma_do_pin(struct i915_vma *vma,
 322                       u64 size, u64 alignment, u64 flags);
 323 static inline int __must_check
 324 i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 325 {
 326         BUILD_BUG_ON(PIN_MBZ != I915_VMA_PIN_OVERFLOW);
 327         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 328         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 329 
 330         /* Pin early to prevent the shrinker/eviction logic from destroying
 331          * our vma as we insert and bind.
 332          */
 333         if (likely(((++vma->flags ^ flags) & I915_VMA_BIND_MASK) == 0)) {
 334                 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 335                 GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 336                 return 0;
 337         }
 338 
 339         return __i915_vma_do_pin(vma, size, alignment, flags);
 340 }
 341 
 342 static inline int i915_vma_pin_count(const struct i915_vma *vma)
 343 {
 344         return vma->flags & I915_VMA_PIN_MASK;
 345 }
 346 
 347 static inline bool i915_vma_is_pinned(const struct i915_vma *vma)
 348 {
 349         return i915_vma_pin_count(vma);
 350 }
 351 
 352 static inline void __i915_vma_pin(struct i915_vma *vma)
 353 {
 354         vma->flags++;
 355         GEM_BUG_ON(vma->flags & I915_VMA_PIN_OVERFLOW);
 356 }
 357 
 358 static inline void __i915_vma_unpin(struct i915_vma *vma)
 359 {
 360         vma->flags--;
 361 }
 362 
 363 static inline void i915_vma_unpin(struct i915_vma *vma)
 364 {
 365         GEM_BUG_ON(!i915_vma_is_pinned(vma));
 366         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 367         __i915_vma_unpin(vma);
 368 }
 369 
 370 static inline bool i915_vma_is_bound(const struct i915_vma *vma,
 371                                      unsigned int where)
 372 {
 373         return vma->flags & where;
 374 }
 375 
 376 /**
 377  * i915_vma_pin_iomap - calls ioremap_wc to map the GGTT VMA via the aperture
 378  * @vma: VMA to iomap
 379  *
 380  * The passed in VMA has to be pinned in the global GTT mappable region.
 381  * An extra pinning of the VMA is acquired for the return iomapping,
 382  * the caller must call i915_vma_unpin_iomap to relinquish the pinning
 383  * after the iomapping is no longer required.
 384  *
 385  * Callers must hold the struct_mutex.
 386  *
 387  * Returns a valid iomapped pointer or ERR_PTR.
 388  */
 389 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma);
 390 #define IO_ERR_PTR(x) ((void __iomem *)ERR_PTR(x))
 391 
 392 /**
 393  * i915_vma_unpin_iomap - unpins the mapping returned from i915_vma_iomap
 394  * @vma: VMA to unpin
 395  *
 396  * Unpins the previously iomapped VMA from i915_vma_pin_iomap().
 397  *
 398  * Callers must hold the struct_mutex. This function is only valid to be
 399  * called on a VMA previously iomapped by the caller with i915_vma_pin_iomap().
 400  */
 401 void i915_vma_unpin_iomap(struct i915_vma *vma);
 402 
 403 static inline struct page *i915_vma_first_page(struct i915_vma *vma)
 404 {
 405         GEM_BUG_ON(!vma->pages);
 406         return sg_page(vma->pages->sgl);
 407 }
 408 
 409 /**
 410  * i915_vma_pin_fence - pin fencing state
 411  * @vma: vma to pin fencing for
 412  *
 413  * This pins the fencing state (whether tiled or untiled) to make sure the
 414  * vma (and its object) is ready to be used as a scanout target. Fencing
 415  * status must be synchronize first by calling i915_vma_get_fence():
 416  *
 417  * The resulting fence pin reference must be released again with
 418  * i915_vma_unpin_fence().
 419  *
 420  * Returns:
 421  *
 422  * True if the vma has a fence, false otherwise.
 423  */
 424 int __must_check i915_vma_pin_fence(struct i915_vma *vma);
 425 int __must_check i915_vma_revoke_fence(struct i915_vma *vma);
 426 
 427 static inline void __i915_vma_unpin_fence(struct i915_vma *vma)
 428 {
 429         GEM_BUG_ON(atomic_read(&vma->fence->pin_count) <= 0);
 430         atomic_dec(&vma->fence->pin_count);
 431 }
 432 
 433 /**
 434  * i915_vma_unpin_fence - unpin fencing state
 435  * @vma: vma to unpin fencing for
 436  *
 437  * This releases the fence pin reference acquired through
 438  * i915_vma_pin_fence. It will handle both objects with and without an
 439  * attached fence correctly, callers do not need to distinguish this.
 440  */
 441 static inline void
 442 i915_vma_unpin_fence(struct i915_vma *vma)
 443 {
 444         /* lockdep_assert_held(&vma->vm->i915->drm.struct_mutex); */
 445         if (vma->fence)
 446                 __i915_vma_unpin_fence(vma);
 447 }
 448 
 449 void i915_vma_parked(struct drm_i915_private *i915);
 450 
 451 #define for_each_until(cond) if (cond) break; else
 452 
 453 /**
 454  * for_each_ggtt_vma - Iterate over the GGTT VMA belonging to an object.
 455  * @V: the #i915_vma iterator
 456  * @OBJ: the #drm_i915_gem_object
 457  *
 458  * GGTT VMA are placed at the being of the object's vma_list, see
 459  * vma_create(), so we can stop our walk as soon as we see a ppgtt VMA,
 460  * or the list is empty ofc.
 461  */
 462 #define for_each_ggtt_vma(V, OBJ) \
 463         list_for_each_entry(V, &(OBJ)->vma.list, obj_link)              \
 464                 for_each_until(!i915_vma_is_ggtt(V))
 465 
 466 struct i915_vma *i915_vma_alloc(void);
 467 void i915_vma_free(struct i915_vma *vma);
 468 
 469 struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma);
 470 void i915_vma_make_shrinkable(struct i915_vma *vma);
 471 void i915_vma_make_purgeable(struct i915_vma *vma);
 472 
 473 #endif