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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/kernel.h> 36 #include <sys/sysctl.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 #include <sys/rwlock.h> 40 #include <sys/proc.h> 41 #include <sys/sched.h> 42 43 #include <machine/bus.h> 44 45 #include <vm/vm.h> 46 #include <vm/pmap.h> 47 #include <vm/vm_param.h> 48 #include <vm/vm_kern.h> 49 #include <vm/vm_object.h> 50 #include <vm/vm_map.h> 51 #include <vm/vm_page.h> 52 #include <vm/vm_pageout.h> 53 #include <vm/vm_pager.h> 54 #include <vm/vm_radix.h> 55 #include <vm/vm_reserv.h> 56 #include <vm/vm_extern.h> 57 58 #include <vm/uma.h> 59 #include <vm/uma_int.h> 60 61 #include <linux/gfp.h> 62 #include <linux/mm.h> 63 #include <linux/preempt.h> 64 #include <linux/fs.h> 65 66 void 67 si_meminfo(struct sysinfo *si) 68 { 69 si->totalram = physmem; 70 si->totalhigh = 0; 71 si->mem_unit = PAGE_SIZE; 72 } 73 74 void * 75 linux_page_address(struct page *page) 76 { 77 78 if (page->object != kmem_object && page->object != kernel_object) { 79 return (PMAP_HAS_DMAP ? 80 ((void *)(uintptr_t)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page))) : 81 NULL); 82 } 83 return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS + 84 IDX_TO_OFF(page->pindex))); 85 } 86 87 vm_page_t 88 linux_alloc_pages(gfp_t flags, unsigned int order) 89 { 90 vm_page_t page; 91 92 if (PMAP_HAS_DMAP) { 93 unsigned long npages = 1UL << order; 94 int req = VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | VM_ALLOC_NORMAL; 95 96 if ((flags & M_ZERO) != 0) 97 req |= VM_ALLOC_ZERO; 98 if (order == 0 && (flags & GFP_DMA32) == 0) { 99 page = vm_page_alloc(NULL, 0, req); 100 if (page == NULL) 101 return (NULL); 102 } else { 103 vm_paddr_t pmax = (flags & GFP_DMA32) ? 104 BUS_SPACE_MAXADDR_32BIT : BUS_SPACE_MAXADDR; 105 retry: 106 page = vm_page_alloc_contig(NULL, 0, req, 107 npages, 0, pmax, PAGE_SIZE, 0, VM_MEMATTR_DEFAULT); 108 109 if (page == NULL) { 110 if (flags & M_WAITOK) { 111 if (!vm_page_reclaim_contig(req, 112 npages, 0, pmax, PAGE_SIZE, 0)) { 113 vm_wait(NULL); 114 } 115 flags &= ~M_WAITOK; 116 goto retry; 117 } 118 return (NULL); 119 } 120 } 121 if (flags & M_ZERO) { 122 unsigned long x; 123 124 for (x = 0; x != npages; x++) { 125 vm_page_t pgo = page + x; 126 127 if ((pgo->flags & PG_ZERO) == 0) 128 pmap_zero_page(pgo); 129 } 130 } 131 } else { 132 vm_offset_t vaddr; 133 134 vaddr = linux_alloc_kmem(flags, order); 135 if (vaddr == 0) 136 return (NULL); 137 138 page = PHYS_TO_VM_PAGE(vtophys((void *)vaddr)); 139 140 KASSERT(vaddr == (vm_offset_t)page_address(page), 141 ("Page address mismatch")); 142 } 143 144 return (page); 145 } 146 147 void 148 linux_free_pages(vm_page_t page, unsigned int order) 149 { 150 if (PMAP_HAS_DMAP) { 151 unsigned long npages = 1UL << order; 152 unsigned long x; 153 154 for (x = 0; x != npages; x++) { 155 vm_page_t pgo = page + x; 156 157 vm_page_lock(pgo); 158 if (vm_page_unwire_noq(pgo)) 159 vm_page_free(pgo); 160 vm_page_unlock(pgo); 161 } 162 } else { 163 vm_offset_t vaddr; 164 165 vaddr = (vm_offset_t)page_address(page); 166 167 linux_free_kmem(vaddr, order); 168 } 169 } 170 171 vm_offset_t 172 linux_alloc_kmem(gfp_t flags, unsigned int order) 173 { 174 size_t size = ((size_t)PAGE_SIZE) << order; 175 vm_offset_t addr; 176 177 if ((flags & GFP_DMA32) == 0) { 178 addr = kmem_malloc(size, flags & GFP_NATIVE_MASK); 179 } else { 180 addr = kmem_alloc_contig(size, flags & GFP_NATIVE_MASK, 0, 181 BUS_SPACE_MAXADDR_32BIT, PAGE_SIZE, 0, VM_MEMATTR_DEFAULT); 182 } 183 return (addr); 184 } 185 186 void 187 linux_free_kmem(vm_offset_t addr, unsigned int order) 188 { 189 size_t size = ((size_t)PAGE_SIZE) << order; 190 191 kmem_free(addr, size); 192 } 193 194 static int 195 linux_get_user_pages_internal(vm_map_t map, unsigned long start, int nr_pages, 196 int write, struct page **pages) 197 { 198 vm_prot_t prot; 199 size_t len; 200 int count; 201 int i; 202 203 prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ; 204 len = ((size_t)nr_pages) << PAGE_SHIFT; 205 count = vm_fault_quick_hold_pages(map, start, len, prot, pages, nr_pages); 206 if (count == -1) 207 return (-EFAULT); 208 209 for (i = 0; i != nr_pages; i++) { 210 struct page *pg = pages[i]; 211 212 vm_page_lock(pg); 213 vm_page_wire(pg); 214 vm_page_unhold(pg); 215 vm_page_unlock(pg); 216 } 217 return (nr_pages); 218 } 219 220 int 221 __get_user_pages_fast(unsigned long start, int nr_pages, int write, 222 struct page **pages) 223 { 224 vm_map_t map; 225 vm_page_t *mp; 226 vm_offset_t va; 227 vm_offset_t end; 228 vm_prot_t prot; 229 int count; 230 231 if (nr_pages == 0 || in_interrupt()) 232 return (0); 233 234 MPASS(pages != NULL); 235 va = start; 236 map = &curthread->td_proc->p_vmspace->vm_map; 237 end = start + (((size_t)nr_pages) << PAGE_SHIFT); 238 if (start < vm_map_min(map) || end > vm_map_max(map)) 239 return (-EINVAL); 240 prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ; 241 for (count = 0, mp = pages, va = start; va < end; 242 mp++, va += PAGE_SIZE, count++) { 243 *mp = pmap_extract_and_hold(map->pmap, va, prot); 244 if (*mp == NULL) 245 break; 246 247 vm_page_lock(*mp); 248 vm_page_wire(*mp); 249 vm_page_unhold(*mp); 250 vm_page_unlock(*mp); 251 252 if ((prot & VM_PROT_WRITE) != 0 && 253 (*mp)->dirty != VM_PAGE_BITS_ALL) { 254 /* 255 * Explicitly dirty the physical page. Otherwise, the 256 * caller's changes may go unnoticed because they are 257 * performed through an unmanaged mapping or by a DMA 258 * operation. 259 * 260 * The object lock is not held here. 261 * See vm_page_clear_dirty_mask(). 262 */ 263 vm_page_dirty(*mp); 264 } 265 } 266 return (count); 267 } 268 269 long 270 get_user_pages_remote(struct task_struct *task, struct mm_struct *mm, 271 unsigned long start, unsigned long nr_pages, int gup_flags, 272 struct page **pages, struct vm_area_struct **vmas) 273 { 274 vm_map_t map; 275 276 map = &task->task_thread->td_proc->p_vmspace->vm_map; 277 return (linux_get_user_pages_internal(map, start, nr_pages, 278 !!(gup_flags & FOLL_WRITE), pages)); 279 } 280 281 long 282 get_user_pages(unsigned long start, unsigned long nr_pages, int gup_flags, 283 struct page **pages, struct vm_area_struct **vmas) 284 { 285 vm_map_t map; 286 287 map = &curthread->td_proc->p_vmspace->vm_map; 288 return (linux_get_user_pages_internal(map, start, nr_pages, 289 !!(gup_flags & FOLL_WRITE), pages)); 290 } 291 292 int 293 is_vmalloc_addr(const void *addr) 294 { 295 return (vtoslab((vm_offset_t)addr & ~UMA_SLAB_MASK) != NULL); 296 } 297 298 struct page * 299 linux_shmem_read_mapping_page_gfp(vm_object_t obj, int pindex, gfp_t gfp) 300 { 301 vm_page_t page; 302 int rv; 303 304 if ((gfp & GFP_NOWAIT) != 0) 305 panic("GFP_NOWAIT is unimplemented"); 306 307 VM_OBJECT_WLOCK(obj); 308 page = vm_page_grab(obj, pindex, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY | 309 VM_ALLOC_WIRED); 310 if (page->valid != VM_PAGE_BITS_ALL) { 311 vm_page_xbusy(page); 312 if (vm_pager_has_page(obj, pindex, NULL, NULL)) { 313 rv = vm_pager_get_pages(obj, &page, 1, NULL, NULL); 314 if (rv != VM_PAGER_OK) { 315 vm_page_lock(page); 316 vm_page_unwire_noq(page); 317 vm_page_free(page); 318 vm_page_unlock(page); 319 VM_OBJECT_WUNLOCK(obj); 320 return (ERR_PTR(-EINVAL)); 321 } 322 MPASS(page->valid == VM_PAGE_BITS_ALL); 323 } else { 324 pmap_zero_page(page); 325 page->valid = VM_PAGE_BITS_ALL; 326 page->dirty = 0; 327 } 328 vm_page_xunbusy(page); 329 } 330 VM_OBJECT_WUNLOCK(obj); 331 return (page); 332 } 333 334 struct linux_file * 335 linux_shmem_file_setup(const char *name, loff_t size, unsigned long flags) 336 { 337 struct fileobj { 338 struct linux_file file __aligned(sizeof(void *)); 339 struct vnode vnode __aligned(sizeof(void *)); 340 }; 341 struct fileobj *fileobj; 342 struct linux_file *filp; 343 struct vnode *vp; 344 int error; 345 346 fileobj = kzalloc(sizeof(*fileobj), GFP_KERNEL); 347 if (fileobj == NULL) { 348 error = -ENOMEM; 349 goto err_0; 350 } 351 filp = &fileobj->file; 352 vp = &fileobj->vnode; 353 354 filp->f_count = 1; 355 filp->f_vnode = vp; 356 filp->f_shmem = vm_pager_allocate(OBJT_DEFAULT, NULL, size, 357 VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred); 358 if (filp->f_shmem == NULL) { 359 error = -ENOMEM; 360 goto err_1; 361 } 362 return (filp); 363 err_1: 364 kfree(filp); 365 err_0: 366 return (ERR_PTR(error)); 367 } 368 369 static vm_ooffset_t 370 linux_invalidate_mapping_pages_sub(vm_object_t obj, vm_pindex_t start, 371 vm_pindex_t end, int flags) 372 { 373 int start_count, end_count; 374 375 VM_OBJECT_WLOCK(obj); 376 start_count = obj->resident_page_count; 377 vm_object_page_remove(obj, start, end, flags); 378 end_count = obj->resident_page_count; 379 VM_OBJECT_WUNLOCK(obj); 380 return (start_count - end_count); 381 } 382 383 unsigned long 384 linux_invalidate_mapping_pages(vm_object_t obj, pgoff_t start, pgoff_t end) 385 { 386 387 return (linux_invalidate_mapping_pages_sub(obj, start, end, OBJPR_CLEANONLY)); 388 } 389 390 void 391 linux_shmem_truncate_range(vm_object_t obj, loff_t lstart, loff_t lend) 392 { 393 vm_pindex_t start = OFF_TO_IDX(lstart + PAGE_SIZE - 1); 394 vm_pindex_t end = OFF_TO_IDX(lend + 1); 395 396 (void) linux_invalidate_mapping_pages_sub(obj, start, end, 0); 397 } 398