2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io)
4 * Copyright (c) 2017 Mellanox Technologies, Ltd.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
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.
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.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
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>
38 #include <sys/mutex.h>
39 #include <sys/rwlock.h>
41 #include <sys/sched.h>
43 #include <machine/bus.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>
59 #include <vm/uma_int.h>
61 #include <linux/gfp.h>
63 #include <linux/preempt.h>
67 linux_page_address(struct page *page)
70 if (page->object != kmem_object && page->object != kernel_object) {
71 return (PMAP_HAS_DMAP ?
72 ((void *)(uintptr_t)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page))) :
75 return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS +
76 IDX_TO_OFF(page->pindex)));
80 linux_alloc_pages(gfp_t flags, unsigned int order)
85 unsigned long npages = 1UL << order;
86 int req = (flags & M_ZERO) ? (VM_ALLOC_ZERO | VM_ALLOC_NOOBJ |
87 VM_ALLOC_NORMAL) : (VM_ALLOC_NOOBJ | VM_ALLOC_NORMAL);
89 if (order == 0 && (flags & GFP_DMA32) == 0) {
90 page = vm_page_alloc(NULL, 0, req);
94 vm_paddr_t pmax = (flags & GFP_DMA32) ?
95 BUS_SPACE_MAXADDR_32BIT : BUS_SPACE_MAXADDR;
97 page = vm_page_alloc_contig(NULL, 0, req,
98 npages, 0, pmax, PAGE_SIZE, 0, VM_MEMATTR_DEFAULT);
101 if (flags & M_WAITOK) {
102 if (!vm_page_reclaim_contig(req,
103 npages, 0, pmax, PAGE_SIZE, 0)) {
112 if (flags & M_ZERO) {
115 for (x = 0; x != npages; x++) {
116 vm_page_t pgo = page + x;
118 if ((pgo->flags & PG_ZERO) == 0)
125 vaddr = linux_alloc_kmem(flags, order);
129 page = PHYS_TO_VM_PAGE(vtophys((void *)vaddr));
131 KASSERT(vaddr == (vm_offset_t)page_address(page),
132 ("Page address mismatch"));
139 linux_free_pages(vm_page_t page, unsigned int order)
142 unsigned long npages = 1UL << order;
145 for (x = 0; x != npages; x++) {
146 vm_page_t pgo = page + x;
155 vaddr = (vm_offset_t)page_address(page);
157 linux_free_kmem(vaddr, order);
162 linux_alloc_kmem(gfp_t flags, unsigned int order)
164 size_t size = ((size_t)PAGE_SIZE) << order;
167 if ((flags & GFP_DMA32) == 0) {
168 addr = kmem_malloc(size, flags & GFP_NATIVE_MASK);
170 addr = kmem_alloc_contig(size, flags & GFP_NATIVE_MASK, 0,
171 BUS_SPACE_MAXADDR_32BIT, PAGE_SIZE, 0, VM_MEMATTR_DEFAULT);
177 linux_free_kmem(vm_offset_t addr, unsigned int order)
179 size_t size = ((size_t)PAGE_SIZE) << order;
181 kmem_free(kmem_arena, addr, size);
185 linux_get_user_pages_internal(vm_map_t map, unsigned long start, int nr_pages,
186 int write, struct page **pages)
193 prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ;
194 len = ((size_t)nr_pages) << PAGE_SHIFT;
195 count = vm_fault_quick_hold_pages(map, start, len, prot, pages, nr_pages);
199 for (i = 0; i != nr_pages; i++) {
200 struct page *pg = pages[i];
211 __get_user_pages_fast(unsigned long start, int nr_pages, int write,
221 if (nr_pages == 0 || in_interrupt())
224 MPASS(pages != NULL);
226 map = &curthread->td_proc->p_vmspace->vm_map;
227 end = start + (((size_t)nr_pages) << PAGE_SHIFT);
228 if (start < vm_map_min(map) || end > vm_map_max(map))
230 prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ;
231 for (count = 0, mp = pages, va = start; va < end;
232 mp++, va += PAGE_SIZE, count++) {
233 *mp = pmap_extract_and_hold(map->pmap, va, prot);
242 if ((prot & VM_PROT_WRITE) != 0 &&
243 (*mp)->dirty != VM_PAGE_BITS_ALL) {
245 * Explicitly dirty the physical page. Otherwise, the
246 * caller's changes may go unnoticed because they are
247 * performed through an unmanaged mapping or by a DMA
250 * The object lock is not held here.
251 * See vm_page_clear_dirty_mask().
260 get_user_pages_remote(struct task_struct *task, struct mm_struct *mm,
261 unsigned long start, unsigned long nr_pages, int gup_flags,
262 struct page **pages, struct vm_area_struct **vmas)
266 map = &task->task_thread->td_proc->p_vmspace->vm_map;
267 return (linux_get_user_pages_internal(map, start, nr_pages,
268 !!(gup_flags & FOLL_WRITE), pages));
272 get_user_pages(unsigned long start, unsigned long nr_pages, int gup_flags,
273 struct page **pages, struct vm_area_struct **vmas)
277 map = &curthread->td_proc->p_vmspace->vm_map;
278 return (linux_get_user_pages_internal(map, start, nr_pages,
279 !!(gup_flags & FOLL_WRITE), pages));
283 is_vmalloc_addr(const void *addr)
285 return (vtoslab((vm_offset_t)addr & ~UMA_SLAB_MASK) != NULL);
289 linux_shmem_read_mapping_page_gfp(vm_object_t obj, int pindex, gfp_t gfp)
294 if ((gfp & GFP_NOWAIT) != 0)
295 panic("GFP_NOWAIT is unimplemented");
297 VM_OBJECT_WLOCK(obj);
298 page = vm_page_grab(obj, pindex, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY |
300 if (page->valid != VM_PAGE_BITS_ALL) {
302 if (vm_pager_has_page(obj, pindex, NULL, NULL)) {
303 rv = vm_pager_get_pages(obj, &page, 1, NULL, NULL);
304 if (rv != VM_PAGER_OK) {
306 vm_page_unwire(page, PQ_NONE);
308 vm_page_unlock(page);
309 VM_OBJECT_WUNLOCK(obj);
310 return (ERR_PTR(-EINVAL));
312 MPASS(page->valid == VM_PAGE_BITS_ALL);
314 pmap_zero_page(page);
315 page->valid = VM_PAGE_BITS_ALL;
318 vm_page_xunbusy(page);
320 VM_OBJECT_WUNLOCK(obj);
325 linux_shmem_file_setup(const char *name, loff_t size, unsigned long flags)
328 struct linux_file file __aligned(sizeof(void *));
329 struct vnode vnode __aligned(sizeof(void *));
331 struct fileobj *fileobj;
332 struct linux_file *filp;
336 fileobj = kzalloc(sizeof(*fileobj), GFP_KERNEL);
337 if (fileobj == NULL) {
341 filp = &fileobj->file;
342 vp = &fileobj->vnode;
346 filp->f_shmem = vm_pager_allocate(OBJT_DEFAULT, NULL, size,
347 VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred);
348 if (filp->f_shmem == NULL) {
356 return (ERR_PTR(error));
360 linux_invalidate_mapping_pages_sub(vm_object_t obj, vm_pindex_t start,
361 vm_pindex_t end, int flags)
363 int start_count, end_count;
365 VM_OBJECT_WLOCK(obj);
366 start_count = obj->resident_page_count;
367 vm_object_page_remove(obj, start, end, flags);
368 end_count = obj->resident_page_count;
369 VM_OBJECT_WUNLOCK(obj);
370 return (start_count - end_count);
374 linux_invalidate_mapping_pages(vm_object_t obj, pgoff_t start, pgoff_t end)
377 return (linux_invalidate_mapping_pages_sub(obj, start, end, OBJPR_CLEANONLY));
381 linux_shmem_truncate_range(vm_object_t obj, loff_t lstart, loff_t lend)
383 vm_pindex_t start = OFF_TO_IDX(lstart + PAGE_SIZE - 1);
384 vm_pindex_t end = OFF_TO_IDX(lend + 1);
386 (void) linux_invalidate_mapping_pages_sub(obj, start, end, 0);