drivers/gpu/drm/i915/i915_vma.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_VMA_H__
  26 #define __I915_VMA_H__
  27
  28 #include <linux/io-mapping.h>
  29
  30 #include <drm/drm_mm.h>
  31
  32 #include "i915_gem_gtt.h"
  33 #include "i915_gem_fence_reg.h"
  34 #include "i915_gem_object.h"
  35 #include "i915_gem_request.h"
  36
  37
  38 enum i915_cache_level;
  39
  40 /**
  41  * A VMA represents a GEM BO that is bound into an address space. Therefore, a
  42  * VMA's presence cannot be guaranteed before binding, or after unbinding the
  43  * object into/from the address space.
  44  *
  45  * To make things as simple as possible (ie. no refcounting), a VMA's lifetime
  46  * will always be <= an objects lifetime. So object refcounting should cover us.
  47  */
  48 struct i915_vma {
  49         struct drm_mm_node node;
  50         struct drm_i915_gem_object *obj;
  51         struct i915_address_space *vm;
  52         struct drm_i915_fence_reg *fence;
  53         struct reservation_object *resv; /** Alias of obj->resv */
  54         struct sg_table *pages;
  55         void __iomem *iomap;
  56         u64 size;
  57         u64 display_alignment;
  58
  59         u32 fence_size;
  60         u32 fence_alignment;
  61
  62         /**
  63          * Count of the number of times this vma has been opened by different
  64          * handles (but same file) for execbuf, i.e. the number of aliases
  65          * that exist in the ctx->handle_vmas LUT for this vma.
  66          */
  67         unsigned int open_count;
  68         unsigned int flags;
  69         /**
  70          * How many users have pinned this object in GTT space. The following
  71          * users can each hold at most one reference: pwrite/pread, execbuffer
  72          * (objects are not allowed multiple times for the same batchbuffer),
  73          * and the framebuffer code. When switching/pageflipping, the
  74          * framebuffer code has at most two buffers pinned per crtc.
  75          *
  76          * In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3
  77          * bits with absolutely no headroom. So use 4 bits.
  78          */
  79 #define I915_VMA_PIN_MASK 0xf
  80 #define I915_VMA_PIN_OVERFLOW   BIT(5)
  81
  82         /** Flags and address space this VMA is bound to */
  83 #define I915_VMA_GLOBAL_BIND    BIT(6)
  84 #define I915_VMA_LOCAL_BIND     BIT(7)
  85 #define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND | I915_VMA_PIN_OVERFLOW)
  86
  87 #define I915_VMA_GGTT           BIT(8)
  88 #define I915_VMA_CAN_FENCE      BIT(9)
  89 #define I915_VMA_CLOSED         BIT(10)
  90
  91         unsigned int active;
  92         struct i915_gem_active last_read[I915_NUM_ENGINES];
  93         struct i915_gem_active last_fence;
  94
  95         /**
  96          * Support different GGTT views into the same object.
  97          * This means there can be multiple VMA mappings per object and per VM.
  98          * i915_ggtt_view_type is used to distinguish between those entries.
  99          * The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
 100          * assumed in GEM functions which take no ggtt view parameter.
 101          */
 102         struct i915_ggtt_view ggtt_view;
 103
 104         /** This object's place on the active/inactive lists */
 105         struct list_head vm_link;
 106
 107         struct list_head obj_link; /* Link in the object's VMA list */
 108         struct rb_node obj_node;
 109         struct hlist_node obj_hash;
 110
 111         /** This vma's place in the execbuf reservation list */
 112         struct list_head exec_link;
 113         struct list_head reloc_link;
 114
 115         /** This vma's place in the eviction list */
 116         struct list_head evict_link;
 117
 118         /**
 119          * Used for performing relocations during execbuffer insertion.
 120          */
 121         unsigned int *exec_flags;
 122         struct hlist_node exec_node;
 123         u32 exec_handle;
 124 };
 125
 126 struct i915_vma *
 127 i915_vma_instance(struct drm_i915_gem_object *obj,
 128                   struct i915_address_space *vm,
 129                   const struct i915_ggtt_view *view);
 130
 131 void i915_vma_unpin_and_release(struct i915_vma **p_vma);
 132
 133 static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
 134 {
 135         return vma->flags & I915_VMA_GGTT;
 136 }
 137
 138 static inline bool i915_vma_is_map_and_fenceable(const struct i915_vma *vma)
 139 {
 140         return vma->flags & I915_VMA_CAN_FENCE;
 141 }
 142
 143 static inline bool i915_vma_is_closed(const struct i915_vma *vma)
 144 {
 145         return vma->flags & I915_VMA_CLOSED;
 146 }
 147
 148 static inline unsigned int i915_vma_get_active(const struct i915_vma *vma)
 149 {
 150         return vma->active;
 151 }
 152
 153 static inline bool i915_vma_is_active(const struct i915_vma *vma)
 154 {
 155         return i915_vma_get_active(vma);
 156 }
 157
 158 static inline void i915_vma_set_active(struct i915_vma *vma,
 159                                        unsigned int engine)
 160 {
 161         vma->active |= BIT(engine);
 162 }
 163
 164 static inline void i915_vma_clear_active(struct i915_vma *vma,
 165                                          unsigned int engine)
 166 {
 167         vma->active &= ~BIT(engine);
 168 }
 169
 170 static inline bool i915_vma_has_active_engine(const struct i915_vma *vma,
 171                                               unsigned int engine)
 172 {
 173         return vma->active & BIT(engine);
 174 }
 175
 176 static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
 177 {
 178         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 179         GEM_BUG_ON(!vma->node.allocated);
 180         GEM_BUG_ON(upper_32_bits(vma->node.start));
 181         GEM_BUG_ON(upper_32_bits(vma->node.start + vma->node.size - 1));
 182         return lower_32_bits(vma->node.start);
 183 }
 184
 185 static inline struct i915_vma *i915_vma_get(struct i915_vma *vma)
 186 {
 187         i915_gem_object_get(vma->obj);
 188         return vma;
 189 }
 190
 191 static inline void i915_vma_put(struct i915_vma *vma)
 192 {
 193         i915_gem_object_put(vma->obj);
 194 }
 195
 196 static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
 197 {
 198         return a - b;
 199 }
 200
 201 static inline long
 202 i915_vma_compare(struct i915_vma *vma,
 203                  struct i915_address_space *vm,
 204                  const struct i915_ggtt_view *view)
 205 {
 206         ptrdiff_t cmp;
 207
 208         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 209
 210         cmp = ptrdiff(vma->vm, vm);
 211         if (cmp)
 212                 return cmp;
 213
 214         BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL != 0);
 215         cmp = vma->ggtt_view.type;
 216         if (!view)
 217                 return cmp;
 218
 219         cmp -= view->type;
 220         if (cmp)
 221                 return cmp;
 222
 223         /* ggtt_view.type also encodes its size so that we both distinguish
 224          * different views using it as a "type" and also use a compact (no
 225          * accessing of uninitialised padding bytes) memcmp without storing
 226          * an extra parameter or adding more code.
 227          *
 228          * To ensure that the memcmp is valid for all branches of the union,
 229          * even though the code looks like it is just comparing one branch,
 230          * we assert above that all branches have the same address, and that
 231          * each branch has a unique type/size.
 232          */
 233         BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
 234         BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
 235         BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
 236                      offsetof(typeof(*view), partial));
 237         return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
 238 }
 239
 240 int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
 241                   u32 flags);
 242 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level);
 243 bool i915_vma_misplaced(const struct i915_vma *vma,
 244                         u64 size, u64 alignment, u64 flags);
 245 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
 246 int __must_check i915_vma_unbind(struct i915_vma *vma);
 247 void i915_vma_unlink_ctx(struct i915_vma *vma);
 248 void i915_vma_close(struct i915_vma *vma);
 249
 250 int __i915_vma_do_pin(struct i915_vma *vma,
 251                       u64 size, u64 alignment, u64 flags);
 252 static inline int __must_check
 253 i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 254 {
 255         BUILD_BUG_ON(PIN_MBZ != I915_VMA_PIN_OVERFLOW);
 256         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 257         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 258
 259         /* Pin early to prevent the shrinker/eviction logic from destroying
 260          * our vma as we insert and bind.
 261          */
 262         if (likely(((++vma->flags ^ flags) & I915_VMA_BIND_MASK) == 0)) {
 263                 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 264                 GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 265                 return 0;
 266         }
 267
 268         return __i915_vma_do_pin(vma, size, alignment, flags);
 269 }
 270
 271 static inline int i915_vma_pin_count(const struct i915_vma *vma)
 272 {
 273         return vma->flags & I915_VMA_PIN_MASK;
 274 }
 275
 276 static inline bool i915_vma_is_pinned(const struct i915_vma *vma)
 277 {
 278         return i915_vma_pin_count(vma);
 279 }
 280
 281 static inline void __i915_vma_pin(struct i915_vma *vma)
 282 {
 283         vma->flags++;
 284         GEM_BUG_ON(vma->flags & I915_VMA_PIN_OVERFLOW);
 285 }
 286
 287 static inline void __i915_vma_unpin(struct i915_vma *vma)
 288 {
 289         vma->flags--;
 290 }
 291
 292 static inline void i915_vma_unpin(struct i915_vma *vma)
 293 {
 294         GEM_BUG_ON(!i915_vma_is_pinned(vma));
 295         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 296         __i915_vma_unpin(vma);
 297 }
 298
 299 /**
 300  * i915_vma_pin_iomap - calls ioremap_wc to map the GGTT VMA via the aperture
 301  * @vma: VMA to iomap
 302  *
 303  * The passed in VMA has to be pinned in the global GTT mappable region.
 304  * An extra pinning of the VMA is acquired for the return iomapping,
 305  * the caller must call i915_vma_unpin_iomap to relinquish the pinning
 306  * after the iomapping is no longer required.
 307  *
 308  * Callers must hold the struct_mutex.
 309  *
 310  * Returns a valid iomapped pointer or ERR_PTR.
 311  */
 312 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma);
 313 #define IO_ERR_PTR(x) ((void __iomem *)ERR_PTR(x))
 314
 315 /**
 316  * i915_vma_unpin_iomap - unpins the mapping returned from i915_vma_iomap
 317  * @vma: VMA to unpin
 318  *
 319  * Unpins the previously iomapped VMA from i915_vma_pin_iomap().
 320  *
 321  * Callers must hold the struct_mutex. This function is only valid to be
 322  * called on a VMA previously iomapped by the caller with i915_vma_pin_iomap().
 323  */
 324 static inline void i915_vma_unpin_iomap(struct i915_vma *vma)
 325 {
 326         lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
 327         GEM_BUG_ON(vma->iomap == NULL);
 328         i915_vma_unpin(vma);
 329 }
 330
 331 static inline struct page *i915_vma_first_page(struct i915_vma *vma)
 332 {
 333         GEM_BUG_ON(!vma->pages);
 334         return sg_page(vma->pages->sgl);
 335 }
 336
 337 /**
 338  * i915_vma_pin_fence - pin fencing state
 339  * @vma: vma to pin fencing for
 340  *
 341  * This pins the fencing state (whether tiled or untiled) to make sure the
 342  * vma (and its object) is ready to be used as a scanout target. Fencing
 343  * status must be synchronize first by calling i915_vma_get_fence():
 344  *
 345  * The resulting fence pin reference must be released again with
 346  * i915_vma_unpin_fence().
 347  *
 348  * Returns:
 349  *
 350  * True if the vma has a fence, false otherwise.
 351  */
 352 static inline bool
 353 i915_vma_pin_fence(struct i915_vma *vma)
 354 {
 355         lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
 356         if (vma->fence) {
 357                 vma->fence->pin_count++;
 358                 return true;
 359         } else
 360                 return false;
 361 }
 362
 363 /**
 364  * i915_vma_unpin_fence - unpin fencing state
 365  * @vma: vma to unpin fencing for
 366  *
 367  * This releases the fence pin reference acquired through
 368  * i915_vma_pin_fence. It will handle both objects with and without an
 369  * attached fence correctly, callers do not need to distinguish this.
 370  */
 371 static inline void
 372 i915_vma_unpin_fence(struct i915_vma *vma)
 373 {
 374         lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
 375         if (vma->fence) {
 376                 GEM_BUG_ON(vma->fence->pin_count <= 0);
 377                 vma->fence->pin_count--;
 378         }
 379 }
 380
 381 #endif
 382