1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2020 Intel Corporation 4 * 5 * Please try to maintain the following order within this file unless it makes 6 * sense to do otherwise. From top to bottom: 7 * 1. typedefs 8 * 2. #defines, and macros 9 * 3. structure definitions 10 * 4. function prototypes 11 * 12 * Within each section, please try to order by generation in ascending order, 13 * from top to bottom (ie. gen6 on the top, gen8 on the bottom). 14 */ 15 16 #ifndef __INTEL_GTT_H__ 17 #define __INTEL_GTT_H__ 18 19 #include <linux/io-mapping.h> 20 #include <linux/kref.h> 21 #include <linux/mm.h> 22 #include <linux/pagevec.h> 23 #include <linux/scatterlist.h> 24 #include <linux/workqueue.h> 25 26 #include <drm/drm_mm.h> 27 28 #include "gt/intel_reset.h" 29 #include "i915_selftest.h" 30 #include "i915_vma_types.h" 31 32 #define I915_GFP_ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN) 33 34 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GTT) 35 #define DBG(...) trace_printk(__VA_ARGS__) 36 #else 37 #define DBG(...) 38 #endif 39 40 #define NALLOC 3 /* 1 normal, 1 for concurrent threads, 1 for preallocation */ 41 42 #define I915_GTT_PAGE_SIZE_4K BIT_ULL(12) 43 #define I915_GTT_PAGE_SIZE_64K BIT_ULL(16) 44 #define I915_GTT_PAGE_SIZE_2M BIT_ULL(21) 45 46 #define I915_GTT_PAGE_SIZE I915_GTT_PAGE_SIZE_4K 47 #define I915_GTT_MAX_PAGE_SIZE I915_GTT_PAGE_SIZE_2M 48 49 #define I915_GTT_PAGE_MASK -I915_GTT_PAGE_SIZE 50 51 #define I915_GTT_MIN_ALIGNMENT I915_GTT_PAGE_SIZE 52 53 #define I915_FENCE_REG_NONE -1 54 #define I915_MAX_NUM_FENCES 32 55 /* 32 fences + sign bit for FENCE_REG_NONE */ 56 #define I915_MAX_NUM_FENCE_BITS 6 57 58 typedef u32 gen6_pte_t; 59 typedef u64 gen8_pte_t; 60 61 #define ggtt_total_entries(ggtt) ((ggtt)->vm.total >> PAGE_SHIFT) 62 63 #define I915_PTES(pte_len) ((unsigned int)(PAGE_SIZE / (pte_len))) 64 #define I915_PTE_MASK(pte_len) (I915_PTES(pte_len) - 1) 65 #define I915_PDES 512 66 #define I915_PDE_MASK (I915_PDES - 1) 67 68 /* gen6-hsw has bit 11-4 for physical addr bit 39-32 */ 69 #define GEN6_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0xff0)) 70 #define GEN6_PTE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr) 71 #define GEN6_PDE_ADDR_ENCODE(addr) GEN6_GTT_ADDR_ENCODE(addr) 72 #define GEN6_PTE_CACHE_LLC (2 << 1) 73 #define GEN6_PTE_UNCACHED (1 << 1) 74 #define GEN6_PTE_VALID REG_BIT(0) 75 76 #define GEN6_PTES I915_PTES(sizeof(gen6_pte_t)) 77 #define GEN6_PD_SIZE (I915_PDES * PAGE_SIZE) 78 #define GEN6_PD_ALIGN (PAGE_SIZE * 16) 79 #define GEN6_PDE_SHIFT 22 80 #define GEN6_PDE_VALID REG_BIT(0) 81 #define NUM_PTE(pde_shift) (1 << (pde_shift - PAGE_SHIFT)) 82 83 #define GEN7_PTE_CACHE_L3_LLC (3 << 1) 84 85 #define BYT_PTE_SNOOPED_BY_CPU_CACHES REG_BIT(2) 86 #define BYT_PTE_WRITEABLE REG_BIT(1) 87 88 #define GEN12_PPGTT_PTE_LM BIT_ULL(11) 89 90 #define GEN12_GGTT_PTE_LM BIT_ULL(1) 91 92 /* 93 * Cacheability Control is a 4-bit value. The low three bits are stored in bits 94 * 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE. 95 */ 96 #define HSW_CACHEABILITY_CONTROL(bits) ((((bits) & 0x7) << 1) | \ 97 (((bits) & 0x8) << (11 - 3))) 98 #define HSW_WB_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x2) 99 #define HSW_WB_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x3) 100 #define HSW_WB_ELLC_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x8) 101 #define HSW_WB_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0xb) 102 #define HSW_WT_ELLC_LLC_AGE3 HSW_CACHEABILITY_CONTROL(0x7) 103 #define HSW_WT_ELLC_LLC_AGE0 HSW_CACHEABILITY_CONTROL(0x6) 104 #define HSW_PTE_UNCACHED (0) 105 #define HSW_GTT_ADDR_ENCODE(addr) ((addr) | (((addr) >> 28) & 0x7f0)) 106 #define HSW_PTE_ADDR_ENCODE(addr) HSW_GTT_ADDR_ENCODE(addr) 107 108 /* 109 * GEN8 32b style address is defined as a 3 level page table: 110 * 31:30 | 29:21 | 20:12 | 11:0 111 * PDPE | PDE | PTE | offset 112 * The difference as compared to normal x86 3 level page table is the PDPEs are 113 * programmed via register. 114 * 115 * GEN8 48b style address is defined as a 4 level page table: 116 * 47:39 | 38:30 | 29:21 | 20:12 | 11:0 117 * PML4E | PDPE | PDE | PTE | offset 118 */ 119 #define GEN8_3LVL_PDPES 4 120 121 #define PPAT_UNCACHED (_PAGE_PWT | _PAGE_PCD) 122 #define PPAT_CACHED_PDE 0 /* WB LLC */ 123 #define PPAT_CACHED _PAGE_PAT /* WB LLCeLLC */ 124 #define PPAT_DISPLAY_ELLC _PAGE_PCD /* WT eLLC */ 125 126 #define CHV_PPAT_SNOOP REG_BIT(6) 127 #define GEN8_PPAT_AGE(x) ((x)<<4) 128 #define GEN8_PPAT_LLCeLLC (3<<2) 129 #define GEN8_PPAT_LLCELLC (2<<2) 130 #define GEN8_PPAT_LLC (1<<2) 131 #define GEN8_PPAT_WB (3<<0) 132 #define GEN8_PPAT_WT (2<<0) 133 #define GEN8_PPAT_WC (1<<0) 134 #define GEN8_PPAT_UC (0<<0) 135 #define GEN8_PPAT_ELLC_OVERRIDE (0<<2) 136 #define GEN8_PPAT(i, x) ((u64)(x) << ((i) * 8)) 137 138 #define GEN8_PDE_IPS_64K BIT(11) 139 #define GEN8_PDE_PS_2M BIT(7) 140 141 enum i915_cache_level; 142 143 struct drm_i915_file_private; 144 struct drm_i915_gem_object; 145 struct i915_fence_reg; 146 struct i915_vma; 147 struct intel_gt; 148 149 #define for_each_sgt_daddr(__dp, __iter, __sgt) \ 150 __for_each_sgt_daddr(__dp, __iter, __sgt, I915_GTT_PAGE_SIZE) 151 152 struct i915_page_table { 153 struct drm_i915_gem_object *base; 154 union { 155 atomic_t used; 156 struct i915_page_table *stash; 157 }; 158 }; 159 160 struct i915_page_directory { 161 struct i915_page_table pt; 162 spinlock_t lock; 163 void **entry; 164 }; 165 166 #define __px_choose_expr(x, type, expr, other) \ 167 __builtin_choose_expr( \ 168 __builtin_types_compatible_p(typeof(x), type) || \ 169 __builtin_types_compatible_p(typeof(x), const type), \ 170 ({ type __x = (type)(x); expr; }), \ 171 other) 172 173 #define px_base(px) \ 174 __px_choose_expr(px, struct drm_i915_gem_object *, __x, \ 175 __px_choose_expr(px, struct i915_page_table *, __x->base, \ 176 __px_choose_expr(px, struct i915_page_directory *, __x->pt.base, \ 177 (void)0))) 178 179 struct page *__px_page(struct drm_i915_gem_object *p); 180 dma_addr_t __px_dma(struct drm_i915_gem_object *p); 181 #define px_dma(px) (__px_dma(px_base(px))) 182 183 void *__px_vaddr(struct drm_i915_gem_object *p); 184 #define px_vaddr(px) (__px_vaddr(px_base(px))) 185 186 #define px_pt(px) \ 187 __px_choose_expr(px, struct i915_page_table *, __x, \ 188 __px_choose_expr(px, struct i915_page_directory *, &__x->pt, \ 189 (void)0)) 190 #define px_used(px) (&px_pt(px)->used) 191 192 struct i915_vm_pt_stash { 193 /* preallocated chains of page tables/directories */ 194 struct i915_page_table *pt[2]; 195 }; 196 197 struct i915_vma_ops { 198 /* Map an object into an address space with the given cache flags. */ 199 void (*bind_vma)(struct i915_address_space *vm, 200 struct i915_vm_pt_stash *stash, 201 struct i915_vma *vma, 202 enum i915_cache_level cache_level, 203 u32 flags); 204 /* 205 * Unmap an object from an address space. This usually consists of 206 * setting the valid PTE entries to a reserved scratch page. 207 */ 208 void (*unbind_vma)(struct i915_address_space *vm, 209 struct i915_vma *vma); 210 211 int (*set_pages)(struct i915_vma *vma); 212 void (*clear_pages)(struct i915_vma *vma); 213 }; 214 215 struct i915_address_space { 216 struct kref ref; 217 struct rcu_work rcu; 218 219 struct drm_mm mm; 220 struct intel_gt *gt; 221 struct drm_i915_private *i915; 222 struct device *dma; 223 /* 224 * Every address space belongs to a struct file - except for the global 225 * GTT that is owned by the driver (and so @file is set to NULL). In 226 * principle, no information should leak from one context to another 227 * (or between files/processes etc) unless explicitly shared by the 228 * owner. Tracking the owner is important in order to free up per-file 229 * objects along with the file, to aide resource tracking, and to 230 * assign blame. 231 */ 232 struct drm_i915_file_private *file; 233 u64 total; /* size addr space maps (ex. 2GB for ggtt) */ 234 u64 reserved; /* size addr space reserved */ 235 236 unsigned int bind_async_flags; 237 238 /* 239 * Each active user context has its own address space (in full-ppgtt). 240 * Since the vm may be shared between multiple contexts, we count how 241 * many contexts keep us "open". Once open hits zero, we are closed 242 * and do not allow any new attachments, and proceed to shutdown our 243 * vma and page directories. 244 */ 245 atomic_t open; 246 247 struct mutex mutex; /* protects vma and our lists */ 248 struct dma_resv resv; /* reservation lock for all pd objects, and buffer pool */ 249 #define VM_CLASS_GGTT 0 250 #define VM_CLASS_PPGTT 1 251 #define VM_CLASS_DPT 2 252 253 struct drm_i915_gem_object *scratch[4]; 254 /** 255 * List of vma currently bound. 256 */ 257 struct list_head bound_list; 258 259 /* Global GTT */ 260 bool is_ggtt:1; 261 262 /* Display page table */ 263 bool is_dpt:1; 264 265 /* Some systems support read-only mappings for GGTT and/or PPGTT */ 266 bool has_read_only:1; 267 268 u8 top; 269 u8 pd_shift; 270 u8 scratch_order; 271 272 struct drm_i915_gem_object * 273 (*alloc_pt_dma)(struct i915_address_space *vm, int sz); 274 275 u64 (*pte_encode)(dma_addr_t addr, 276 enum i915_cache_level level, 277 u32 flags); /* Create a valid PTE */ 278 #define PTE_READ_ONLY BIT(0) 279 #define PTE_LM BIT(1) 280 281 void (*allocate_va_range)(struct i915_address_space *vm, 282 struct i915_vm_pt_stash *stash, 283 u64 start, u64 length); 284 void (*clear_range)(struct i915_address_space *vm, 285 u64 start, u64 length); 286 void (*insert_page)(struct i915_address_space *vm, 287 dma_addr_t addr, 288 u64 offset, 289 enum i915_cache_level cache_level, 290 u32 flags); 291 void (*insert_entries)(struct i915_address_space *vm, 292 struct i915_vma *vma, 293 enum i915_cache_level cache_level, 294 u32 flags); 295 void (*cleanup)(struct i915_address_space *vm); 296 297 struct i915_vma_ops vma_ops; 298 299 I915_SELFTEST_DECLARE(struct fault_attr fault_attr); 300 I915_SELFTEST_DECLARE(bool scrub_64K); 301 }; 302 303 /* 304 * The Graphics Translation Table is the way in which GEN hardware translates a 305 * Graphics Virtual Address into a Physical Address. In addition to the normal 306 * collateral associated with any va->pa translations GEN hardware also has a 307 * portion of the GTT which can be mapped by the CPU and remain both coherent 308 * and correct (in cases like swizzling). That region is referred to as GMADR in 309 * the spec. 310 */ 311 struct i915_ggtt { 312 struct i915_address_space vm; 313 314 struct io_mapping iomap; /* Mapping to our CPU mappable region */ 315 struct resource gmadr; /* GMADR resource */ 316 resource_size_t mappable_end; /* End offset that we can CPU map */ 317 318 /** "Graphics Stolen Memory" holds the global PTEs */ 319 void __iomem *gsm; 320 void (*invalidate)(struct i915_ggtt *ggtt); 321 322 /** PPGTT used for aliasing the PPGTT with the GTT */ 323 struct i915_ppgtt *alias; 324 325 bool do_idle_maps; 326 327 int mtrr; 328 329 /** Bit 6 swizzling required for X tiling */ 330 u32 bit_6_swizzle_x; 331 /** Bit 6 swizzling required for Y tiling */ 332 u32 bit_6_swizzle_y; 333 334 u32 pin_bias; 335 336 unsigned int num_fences; 337 struct i915_fence_reg *fence_regs; 338 struct list_head fence_list; 339 340 /** 341 * List of all objects in gtt_space, currently mmaped by userspace. 342 * All objects within this list must also be on bound_list. 343 */ 344 struct list_head userfault_list; 345 346 /* Manual runtime pm autosuspend delay for user GGTT mmaps */ 347 struct intel_wakeref_auto userfault_wakeref; 348 349 struct mutex error_mutex; 350 struct drm_mm_node error_capture; 351 struct drm_mm_node uc_fw; 352 }; 353 354 struct i915_ppgtt { 355 struct i915_address_space vm; 356 357 struct i915_page_directory *pd; 358 }; 359 360 #define i915_is_ggtt(vm) ((vm)->is_ggtt) 361 #define i915_is_dpt(vm) ((vm)->is_dpt) 362 363 int __must_check 364 i915_vm_lock_objects(struct i915_address_space *vm, struct i915_gem_ww_ctx *ww); 365 366 static inline bool 367 i915_vm_is_4lvl(const struct i915_address_space *vm) 368 { 369 return (vm->total - 1) >> 32; 370 } 371 372 static inline bool 373 i915_vm_has_scratch_64K(struct i915_address_space *vm) 374 { 375 return vm->scratch_order == get_order(I915_GTT_PAGE_SIZE_64K); 376 } 377 378 static inline bool 379 i915_vm_has_cache_coloring(struct i915_address_space *vm) 380 { 381 return i915_is_ggtt(vm) && vm->mm.color_adjust; 382 } 383 384 static inline struct i915_ggtt * 385 i915_vm_to_ggtt(struct i915_address_space *vm) 386 { 387 BUILD_BUG_ON(offsetof(struct i915_ggtt, vm)); 388 GEM_BUG_ON(!i915_is_ggtt(vm)); 389 return container_of(vm, struct i915_ggtt, vm); 390 } 391 392 static inline struct i915_ppgtt * 393 i915_vm_to_ppgtt(struct i915_address_space *vm) 394 { 395 BUILD_BUG_ON(offsetof(struct i915_ppgtt, vm)); 396 GEM_BUG_ON(i915_is_ggtt(vm)); 397 return container_of(vm, struct i915_ppgtt, vm); 398 } 399 400 static inline struct i915_address_space * 401 i915_vm_get(struct i915_address_space *vm) 402 { 403 kref_get(&vm->ref); 404 return vm; 405 } 406 407 void i915_vm_release(struct kref *kref); 408 409 static inline void i915_vm_put(struct i915_address_space *vm) 410 { 411 kref_put(&vm->ref, i915_vm_release); 412 } 413 414 static inline struct i915_address_space * 415 i915_vm_open(struct i915_address_space *vm) 416 { 417 GEM_BUG_ON(!atomic_read(&vm->open)); 418 atomic_inc(&vm->open); 419 return i915_vm_get(vm); 420 } 421 422 static inline bool 423 i915_vm_tryopen(struct i915_address_space *vm) 424 { 425 if (atomic_add_unless(&vm->open, 1, 0)) 426 return i915_vm_get(vm); 427 428 return false; 429 } 430 431 void __i915_vm_close(struct i915_address_space *vm); 432 433 static inline void 434 i915_vm_close(struct i915_address_space *vm) 435 { 436 GEM_BUG_ON(!atomic_read(&vm->open)); 437 __i915_vm_close(vm); 438 439 i915_vm_put(vm); 440 } 441 442 void i915_address_space_init(struct i915_address_space *vm, int subclass); 443 void i915_address_space_fini(struct i915_address_space *vm); 444 445 static inline u32 i915_pte_index(u64 address, unsigned int pde_shift) 446 { 447 const u32 mask = NUM_PTE(pde_shift) - 1; 448 449 return (address >> PAGE_SHIFT) & mask; 450 } 451 452 /* 453 * Helper to counts the number of PTEs within the given length. This count 454 * does not cross a page table boundary, so the max value would be 455 * GEN6_PTES for GEN6, and GEN8_PTES for GEN8. 456 */ 457 static inline u32 i915_pte_count(u64 addr, u64 length, unsigned int pde_shift) 458 { 459 const u64 mask = ~((1ULL << pde_shift) - 1); 460 u64 end; 461 462 GEM_BUG_ON(length == 0); 463 GEM_BUG_ON(offset_in_page(addr | length)); 464 465 end = addr + length; 466 467 if ((addr & mask) != (end & mask)) 468 return NUM_PTE(pde_shift) - i915_pte_index(addr, pde_shift); 469 470 return i915_pte_index(end, pde_shift) - i915_pte_index(addr, pde_shift); 471 } 472 473 static inline u32 i915_pde_index(u64 addr, u32 shift) 474 { 475 return (addr >> shift) & I915_PDE_MASK; 476 } 477 478 static inline struct i915_page_table * 479 i915_pt_entry(const struct i915_page_directory * const pd, 480 const unsigned short n) 481 { 482 return pd->entry[n]; 483 } 484 485 static inline struct i915_page_directory * 486 i915_pd_entry(const struct i915_page_directory * const pdp, 487 const unsigned short n) 488 { 489 return pdp->entry[n]; 490 } 491 492 static inline dma_addr_t 493 i915_page_dir_dma_addr(const struct i915_ppgtt *ppgtt, const unsigned int n) 494 { 495 struct i915_page_table *pt = ppgtt->pd->entry[n]; 496 497 return __px_dma(pt ? px_base(pt) : ppgtt->vm.scratch[ppgtt->vm.top]); 498 } 499 500 void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt); 501 502 int i915_ggtt_probe_hw(struct drm_i915_private *i915); 503 int i915_ggtt_init_hw(struct drm_i915_private *i915); 504 int i915_ggtt_enable_hw(struct drm_i915_private *i915); 505 void i915_ggtt_enable_guc(struct i915_ggtt *ggtt); 506 void i915_ggtt_disable_guc(struct i915_ggtt *ggtt); 507 int i915_init_ggtt(struct drm_i915_private *i915); 508 void i915_ggtt_driver_release(struct drm_i915_private *i915); 509 510 static inline bool i915_ggtt_has_aperture(const struct i915_ggtt *ggtt) 511 { 512 return ggtt->mappable_end > 0; 513 } 514 515 int i915_ppgtt_init_hw(struct intel_gt *gt); 516 517 struct i915_ppgtt *i915_ppgtt_create(struct intel_gt *gt); 518 519 void i915_ggtt_suspend(struct i915_ggtt *gtt); 520 void i915_ggtt_resume(struct i915_ggtt *ggtt); 521 522 void 523 fill_page_dma(struct drm_i915_gem_object *p, const u64 val, unsigned int count); 524 525 #define fill_px(px, v) fill_page_dma(px_base(px), (v), PAGE_SIZE / sizeof(u64)) 526 #define fill32_px(px, v) do { \ 527 u64 v__ = lower_32_bits(v); \ 528 fill_px((px), v__ << 32 | v__); \ 529 } while (0) 530 531 int setup_scratch_page(struct i915_address_space *vm); 532 void free_scratch(struct i915_address_space *vm); 533 534 struct drm_i915_gem_object *alloc_pt_dma(struct i915_address_space *vm, int sz); 535 struct drm_i915_gem_object *alloc_pt_lmem(struct i915_address_space *vm, int sz); 536 struct i915_page_table *alloc_pt(struct i915_address_space *vm); 537 struct i915_page_directory *alloc_pd(struct i915_address_space *vm); 538 struct i915_page_directory *__alloc_pd(int npde); 539 540 int map_pt_dma(struct i915_address_space *vm, struct drm_i915_gem_object *obj); 541 int map_pt_dma_locked(struct i915_address_space *vm, struct drm_i915_gem_object *obj); 542 543 void free_px(struct i915_address_space *vm, 544 struct i915_page_table *pt, int lvl); 545 #define free_pt(vm, px) free_px(vm, px, 0) 546 #define free_pd(vm, px) free_px(vm, px_pt(px), 1) 547 548 void 549 __set_pd_entry(struct i915_page_directory * const pd, 550 const unsigned short idx, 551 struct i915_page_table *pt, 552 u64 (*encode)(const dma_addr_t, const enum i915_cache_level)); 553 554 #define set_pd_entry(pd, idx, to) \ 555 __set_pd_entry((pd), (idx), px_pt(to), gen8_pde_encode) 556 557 void 558 clear_pd_entry(struct i915_page_directory * const pd, 559 const unsigned short idx, 560 const struct drm_i915_gem_object * const scratch); 561 562 bool 563 release_pd_entry(struct i915_page_directory * const pd, 564 const unsigned short idx, 565 struct i915_page_table * const pt, 566 const struct drm_i915_gem_object * const scratch); 567 void gen6_ggtt_invalidate(struct i915_ggtt *ggtt); 568 569 int ggtt_set_pages(struct i915_vma *vma); 570 int ppgtt_set_pages(struct i915_vma *vma); 571 void clear_pages(struct i915_vma *vma); 572 573 void ppgtt_bind_vma(struct i915_address_space *vm, 574 struct i915_vm_pt_stash *stash, 575 struct i915_vma *vma, 576 enum i915_cache_level cache_level, 577 u32 flags); 578 void ppgtt_unbind_vma(struct i915_address_space *vm, 579 struct i915_vma *vma); 580 581 void gtt_write_workarounds(struct intel_gt *gt); 582 583 void setup_private_pat(struct intel_uncore *uncore); 584 585 int i915_vm_alloc_pt_stash(struct i915_address_space *vm, 586 struct i915_vm_pt_stash *stash, 587 u64 size); 588 int i915_vm_map_pt_stash(struct i915_address_space *vm, 589 struct i915_vm_pt_stash *stash); 590 void i915_vm_free_pt_stash(struct i915_address_space *vm, 591 struct i915_vm_pt_stash *stash); 592 593 struct i915_vma * 594 __vm_create_scratch_for_read(struct i915_address_space *vm, unsigned long size); 595 596 struct i915_vma * 597 __vm_create_scratch_for_read_pinned(struct i915_address_space *vm, unsigned long size); 598 599 static inline struct sgt_dma { 600 struct scatterlist *sg; 601 dma_addr_t dma, max; 602 } sgt_dma(struct i915_vma *vma) { 603 struct scatterlist *sg = vma->pages->sgl; 604 dma_addr_t addr = sg_dma_address(sg); 605 606 return (struct sgt_dma){ sg, addr, addr + sg_dma_len(sg) }; 607 } 608 609 #endif 610