1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io) 4 * Copyright (c) 2017 Mellanox Technologies, Ltd. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/malloc.h> 32 #include <sys/kernel.h> 33 #include <sys/sysctl.h> 34 #include <sys/lock.h> 35 #include <sys/mutex.h> 36 #include <sys/rwlock.h> 37 #include <sys/proc.h> 38 #include <sys/sched.h> 39 #include <sys/memrange.h> 40 41 #include <machine/bus.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 #include <vm/vm_param.h> 46 #include <vm/vm_kern.h> 47 #include <vm/vm_object.h> 48 #include <vm/vm_map.h> 49 #include <vm/vm_page.h> 50 #include <vm/vm_pageout.h> 51 #include <vm/vm_pager.h> 52 #include <vm/vm_radix.h> 53 #include <vm/vm_reserv.h> 54 #include <vm/vm_extern.h> 55 56 #include <vm/uma.h> 57 #include <vm/uma_int.h> 58 59 #include <linux/gfp.h> 60 #include <linux/mm.h> 61 #include <linux/preempt.h> 62 #include <linux/fs.h> 63 #include <linux/shmem_fs.h> 64 #include <linux/kernel.h> 65 #include <linux/idr.h> 66 #include <linux/io.h> 67 #include <linux/io-mapping.h> 68 69 #ifdef __i386__ 70 DEFINE_IDR(mtrr_idr); 71 static MALLOC_DEFINE(M_LKMTRR, "idr", "Linux MTRR compat"); 72 extern int pat_works; 73 #endif 74 75 void 76 si_meminfo(struct sysinfo *si) 77 { 78 si->totalram = physmem; 79 si->freeram = vm_free_count(); 80 si->totalhigh = 0; 81 si->freehigh = 0; 82 si->mem_unit = PAGE_SIZE; 83 } 84 85 void * 86 linux_page_address(struct page *page) 87 { 88 89 if (page->object != kernel_object) { 90 return (PMAP_HAS_DMAP ? 91 ((void *)(uintptr_t)PHYS_TO_DMAP(page_to_phys(page))) : 92 NULL); 93 } 94 return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS + 95 IDX_TO_OFF(page->pindex))); 96 } 97 98 struct page * 99 linux_alloc_pages(gfp_t flags, unsigned int order) 100 { 101 struct page *page; 102 103 if (PMAP_HAS_DMAP) { 104 unsigned long npages = 1UL << order; 105 int req = VM_ALLOC_WIRED; 106 107 if ((flags & M_ZERO) != 0) 108 req |= VM_ALLOC_ZERO; 109 if (order == 0 && (flags & GFP_DMA32) == 0) { 110 page = vm_page_alloc_noobj(req); 111 if (page == NULL) 112 return (NULL); 113 } else { 114 vm_paddr_t pmax = (flags & GFP_DMA32) ? 115 BUS_SPACE_MAXADDR_32BIT : BUS_SPACE_MAXADDR; 116 retry: 117 page = vm_page_alloc_noobj_contig(req, npages, 0, pmax, 118 PAGE_SIZE, 0, VM_MEMATTR_DEFAULT); 119 if (page == NULL) { 120 if ((flags & (M_WAITOK | __GFP_NORETRY)) == 121 M_WAITOK) { 122 int err = vm_page_reclaim_contig(req, 123 npages, 0, pmax, PAGE_SIZE, 0); 124 if (err == ENOMEM) 125 vm_wait(NULL); 126 else if (err != 0) 127 return (NULL); 128 flags &= ~M_WAITOK; 129 goto retry; 130 } 131 return (NULL); 132 } 133 } 134 } else { 135 vm_offset_t vaddr; 136 137 vaddr = linux_alloc_kmem(flags, order); 138 if (vaddr == 0) 139 return (NULL); 140 141 page = virt_to_page((void *)vaddr); 142 143 KASSERT(vaddr == (vm_offset_t)page_address(page), 144 ("Page address mismatch")); 145 } 146 147 return (page); 148 } 149 150 static void 151 _linux_free_kmem(vm_offset_t addr, unsigned int order) 152 { 153 size_t size = ((size_t)PAGE_SIZE) << order; 154 155 kmem_free((void *)addr, size); 156 } 157 158 void 159 linux_free_pages(struct page *page, unsigned int order) 160 { 161 if (PMAP_HAS_DMAP) { 162 unsigned long npages = 1UL << order; 163 unsigned long x; 164 165 for (x = 0; x != npages; x++) { 166 vm_page_t pgo = page + x; 167 168 if (vm_page_unwire_noq(pgo)) 169 vm_page_free(pgo); 170 } 171 } else { 172 vm_offset_t vaddr; 173 174 vaddr = (vm_offset_t)page_address(page); 175 176 _linux_free_kmem(vaddr, order); 177 } 178 } 179 180 vm_offset_t 181 linux_alloc_kmem(gfp_t flags, unsigned int order) 182 { 183 size_t size = ((size_t)PAGE_SIZE) << order; 184 void *addr; 185 186 addr = kmem_alloc_contig(size, flags & GFP_NATIVE_MASK, 0, 187 ((flags & GFP_DMA32) == 0) ? -1UL : BUS_SPACE_MAXADDR_32BIT, 188 PAGE_SIZE, 0, VM_MEMATTR_DEFAULT); 189 190 return ((vm_offset_t)addr); 191 } 192 193 void 194 linux_free_kmem(vm_offset_t addr, unsigned int order) 195 { 196 KASSERT((addr & ~PAGE_MASK) == 0, 197 ("%s: addr %p is not page aligned", __func__, (void *)addr)); 198 199 if (addr >= VM_MIN_KERNEL_ADDRESS && addr < VM_MAX_KERNEL_ADDRESS) { 200 _linux_free_kmem(addr, order); 201 } else { 202 vm_page_t page; 203 204 page = PHYS_TO_VM_PAGE(DMAP_TO_PHYS(addr)); 205 linux_free_pages(page, order); 206 } 207 } 208 209 static int 210 linux_get_user_pages_internal(vm_map_t map, unsigned long start, int nr_pages, 211 int write, struct page **pages) 212 { 213 vm_prot_t prot; 214 size_t len; 215 int count; 216 217 prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ; 218 len = ptoa((vm_offset_t)nr_pages); 219 count = vm_fault_quick_hold_pages(map, start, len, prot, pages, nr_pages); 220 return (count == -1 ? -EFAULT : nr_pages); 221 } 222 223 int 224 __get_user_pages_fast(unsigned long start, int nr_pages, int write, 225 struct page **pages) 226 { 227 vm_map_t map; 228 vm_page_t *mp; 229 vm_offset_t va; 230 vm_offset_t end; 231 vm_prot_t prot; 232 int count; 233 234 if (nr_pages == 0 || in_interrupt()) 235 return (0); 236 237 MPASS(pages != NULL); 238 map = &curthread->td_proc->p_vmspace->vm_map; 239 end = start + ptoa((vm_offset_t)nr_pages); 240 if (!vm_map_range_valid(map, start, end)) 241 return (-EINVAL); 242 prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ; 243 for (count = 0, mp = pages, va = start; va < end; 244 mp++, va += PAGE_SIZE, count++) { 245 *mp = pmap_extract_and_hold(map->pmap, va, prot); 246 if (*mp == NULL) 247 break; 248 249 if ((prot & VM_PROT_WRITE) != 0 && 250 (*mp)->dirty != VM_PAGE_BITS_ALL) { 251 /* 252 * Explicitly dirty the physical page. Otherwise, the 253 * caller's changes may go unnoticed because they are 254 * performed through an unmanaged mapping or by a DMA 255 * operation. 256 * 257 * The object lock is not held here. 258 * See vm_page_clear_dirty_mask(). 259 */ 260 vm_page_dirty(*mp); 261 } 262 } 263 return (count); 264 } 265 266 long 267 get_user_pages_remote(struct task_struct *task, struct mm_struct *mm, 268 unsigned long start, unsigned long nr_pages, unsigned int gup_flags, 269 struct page **pages, struct vm_area_struct **vmas) 270 { 271 vm_map_t map; 272 273 map = &task->task_thread->td_proc->p_vmspace->vm_map; 274 return (linux_get_user_pages_internal(map, start, nr_pages, 275 !!(gup_flags & FOLL_WRITE), pages)); 276 } 277 278 long 279 lkpi_get_user_pages(unsigned long start, unsigned long nr_pages, 280 unsigned int gup_flags, struct page **pages) 281 { 282 vm_map_t map; 283 284 map = &curthread->td_proc->p_vmspace->vm_map; 285 return (linux_get_user_pages_internal(map, start, nr_pages, 286 !!(gup_flags & FOLL_WRITE), pages)); 287 } 288 289 int 290 is_vmalloc_addr(const void *addr) 291 { 292 return (vtoslab((vm_offset_t)addr & ~UMA_SLAB_MASK) != NULL); 293 } 294 295 vm_fault_t 296 lkpi_vmf_insert_pfn_prot_locked(struct vm_area_struct *vma, unsigned long addr, 297 unsigned long pfn, pgprot_t prot) 298 { 299 vm_object_t vm_obj = vma->vm_obj; 300 vm_object_t tmp_obj; 301 vm_page_t page; 302 vm_pindex_t pindex; 303 304 VM_OBJECT_ASSERT_WLOCKED(vm_obj); 305 pindex = OFF_TO_IDX(addr - vma->vm_start); 306 if (vma->vm_pfn_count == 0) 307 vma->vm_pfn_first = pindex; 308 MPASS(pindex <= OFF_TO_IDX(vma->vm_end)); 309 310 retry: 311 page = vm_page_grab(vm_obj, pindex, VM_ALLOC_NOCREAT); 312 if (page == NULL) { 313 page = PHYS_TO_VM_PAGE(IDX_TO_OFF(pfn)); 314 if (!vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL)) 315 goto retry; 316 if (page->object != NULL) { 317 tmp_obj = page->object; 318 vm_page_xunbusy(page); 319 VM_OBJECT_WUNLOCK(vm_obj); 320 VM_OBJECT_WLOCK(tmp_obj); 321 if (page->object == tmp_obj && 322 vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL)) { 323 KASSERT(page->object == tmp_obj, 324 ("page has changed identity")); 325 KASSERT((page->oflags & VPO_UNMANAGED) == 0, 326 ("page does not belong to shmem")); 327 vm_pager_page_unswapped(page); 328 if (pmap_page_is_mapped(page)) { 329 vm_page_xunbusy(page); 330 VM_OBJECT_WUNLOCK(tmp_obj); 331 printf("%s: page rename failed: page " 332 "is mapped\n", __func__); 333 VM_OBJECT_WLOCK(vm_obj); 334 return (VM_FAULT_NOPAGE); 335 } 336 vm_page_remove(page); 337 } 338 VM_OBJECT_WUNLOCK(tmp_obj); 339 VM_OBJECT_WLOCK(vm_obj); 340 goto retry; 341 } 342 if (vm_page_insert(page, vm_obj, pindex)) { 343 vm_page_xunbusy(page); 344 return (VM_FAULT_OOM); 345 } 346 vm_page_valid(page); 347 } 348 pmap_page_set_memattr(page, pgprot2cachemode(prot)); 349 vma->vm_pfn_count++; 350 351 return (VM_FAULT_NOPAGE); 352 } 353 354 int 355 lkpi_remap_pfn_range(struct vm_area_struct *vma, unsigned long start_addr, 356 unsigned long start_pfn, unsigned long size, pgprot_t prot) 357 { 358 vm_object_t vm_obj; 359 unsigned long addr, pfn; 360 int err = 0; 361 362 vm_obj = vma->vm_obj; 363 364 VM_OBJECT_WLOCK(vm_obj); 365 for (addr = start_addr, pfn = start_pfn; 366 addr < start_addr + size; 367 addr += PAGE_SIZE) { 368 vm_fault_t ret; 369 retry: 370 ret = lkpi_vmf_insert_pfn_prot_locked(vma, addr, pfn, prot); 371 372 if ((ret & VM_FAULT_OOM) != 0) { 373 VM_OBJECT_WUNLOCK(vm_obj); 374 vm_wait(NULL); 375 VM_OBJECT_WLOCK(vm_obj); 376 goto retry; 377 } 378 379 if ((ret & VM_FAULT_ERROR) != 0) { 380 err = -EFAULT; 381 break; 382 } 383 384 pfn++; 385 } 386 VM_OBJECT_WUNLOCK(vm_obj); 387 388 if (unlikely(err)) { 389 zap_vma_ptes(vma, start_addr, 390 (pfn - start_pfn) << PAGE_SHIFT); 391 return (err); 392 } 393 394 return (0); 395 } 396 397 int 398 lkpi_io_mapping_map_user(struct io_mapping *iomap, 399 struct vm_area_struct *vma, unsigned long addr, 400 unsigned long pfn, unsigned long size) 401 { 402 pgprot_t prot; 403 int ret; 404 405 prot = cachemode2protval(iomap->attr); 406 ret = lkpi_remap_pfn_range(vma, addr, pfn, size, prot); 407 408 return (ret); 409 } 410 411 /* 412 * Although FreeBSD version of unmap_mapping_range has semantics and types of 413 * parameters compatible with Linux version, the values passed in are different 414 * @obj should match to vm_private_data field of vm_area_struct returned by 415 * mmap file operation handler, see linux_file_mmap_single() sources 416 * @holelen should match to size of area to be munmapped. 417 */ 418 void 419 lkpi_unmap_mapping_range(void *obj, loff_t const holebegin __unused, 420 loff_t const holelen __unused, int even_cows __unused) 421 { 422 vm_object_t devobj; 423 424 devobj = cdev_pager_lookup(obj); 425 if (devobj != NULL) { 426 cdev_mgtdev_pager_free_pages(devobj); 427 vm_object_deallocate(devobj); 428 } 429 } 430 431 int 432 lkpi_arch_phys_wc_add(unsigned long base, unsigned long size) 433 { 434 #ifdef __i386__ 435 struct mem_range_desc *mrdesc; 436 int error, id, act; 437 438 /* If PAT is available, do nothing */ 439 if (pat_works) 440 return (0); 441 442 mrdesc = malloc(sizeof(*mrdesc), M_LKMTRR, M_WAITOK); 443 mrdesc->mr_base = base; 444 mrdesc->mr_len = size; 445 mrdesc->mr_flags = MDF_WRITECOMBINE; 446 strlcpy(mrdesc->mr_owner, "drm", sizeof(mrdesc->mr_owner)); 447 act = MEMRANGE_SET_UPDATE; 448 error = mem_range_attr_set(mrdesc, &act); 449 if (error == 0) { 450 error = idr_get_new(&mtrr_idr, mrdesc, &id); 451 MPASS(idr_find(&mtrr_idr, id) == mrdesc); 452 if (error != 0) { 453 act = MEMRANGE_SET_REMOVE; 454 mem_range_attr_set(mrdesc, &act); 455 } 456 } 457 if (error != 0) { 458 free(mrdesc, M_LKMTRR); 459 pr_warn( 460 "Failed to add WC MTRR for [%p-%p]: %d; " 461 "performance may suffer\n", 462 (void *)base, (void *)(base + size - 1), error); 463 } else 464 pr_warn("Successfully added WC MTRR for [%p-%p]\n", 465 (void *)base, (void *)(base + size - 1)); 466 467 return (error != 0 ? -error : id + __MTRR_ID_BASE); 468 #else 469 return (0); 470 #endif 471 } 472 473 void 474 lkpi_arch_phys_wc_del(int reg) 475 { 476 #ifdef __i386__ 477 struct mem_range_desc *mrdesc; 478 int act; 479 480 /* Check if arch_phys_wc_add() failed. */ 481 if (reg < __MTRR_ID_BASE) 482 return; 483 484 mrdesc = idr_find(&mtrr_idr, reg - __MTRR_ID_BASE); 485 MPASS(mrdesc != NULL); 486 idr_remove(&mtrr_idr, reg - __MTRR_ID_BASE); 487 act = MEMRANGE_SET_REMOVE; 488 mem_range_attr_set(mrdesc, &act); 489 free(mrdesc, M_LKMTRR); 490 #endif 491 } 492 493 /* 494 * This is a highly simplified version of the Linux page_frag_cache. 495 * We only support up-to 1 single page as fragment size and we will 496 * always return a full page. This may be wasteful on small objects 497 * but the only known consumer (mt76) is either asking for a half-page 498 * or a full page. If this was to become a problem we can implement 499 * a more elaborate version. 500 */ 501 void * 502 linuxkpi_page_frag_alloc(struct page_frag_cache *pfc, 503 size_t fragsz, gfp_t gfp) 504 { 505 vm_page_t pages; 506 507 if (fragsz == 0) 508 return (NULL); 509 510 KASSERT(fragsz <= PAGE_SIZE, ("%s: fragsz %zu > PAGE_SIZE not yet " 511 "supported", __func__, fragsz)); 512 513 pages = alloc_pages(gfp, flsl(howmany(fragsz, PAGE_SIZE) - 1)); 514 if (pages == NULL) 515 return (NULL); 516 pfc->va = linux_page_address(pages); 517 518 /* Passed in as "count" to __page_frag_cache_drain(). Unused by us. */ 519 pfc->pagecnt_bias = 0; 520 521 return (pfc->va); 522 } 523 524 void 525 linuxkpi_page_frag_free(void *addr) 526 { 527 vm_page_t page; 528 529 page = virt_to_page(addr); 530 linux_free_pages(page, 0); 531 } 532 533 void 534 linuxkpi__page_frag_cache_drain(struct page *page, size_t count __unused) 535 { 536 537 linux_free_pages(page, 0); 538 } 539