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_vm_phys.h
(2.27 KB)
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_vm_radix.h
(1.64 KB)
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default_pager.c
(4.83 KB)
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device_pager.c
(13.06 KB)
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memguard.c
(15.13 KB)
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memguard.h
(2.35 KB)
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phys_pager.c
(8.62 KB)
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pmap.h
(7.06 KB)
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redzone.c
(4.95 KB)
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redzone.h
(1.69 KB)
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sg_pager.c
(6.34 KB)
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swap_pager.c
(79.57 KB)
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swap_pager.h
(2.99 KB)
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uma.h
(22.13 KB)
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uma_core.c
(141.88 KB)
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uma_dbg.c
(4.94 KB)
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uma_dbg.h
(2.09 KB)
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uma_int.h
(22.27 KB)
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vm.h
(5.58 KB)
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vm_domainset.c
(9.29 KB)
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vm_domainset.h
(2.19 KB)
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vm_dumpset.h
(2.99 KB)
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vm_extern.h
(5.87 KB)
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vm_fault.c
(59.06 KB)
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vm_glue.c
(15.52 KB)
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vm_init.c
(7.67 KB)
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vm_kern.c
(24.67 KB)
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vm_kern.h
(3.47 KB)
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vm_map.c
(149.63 KB)
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vm_map.h
(18.52 KB)
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vm_meter.c
(17.87 KB)
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vm_mmap.c
(39.75 KB)
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vm_object.c
(76.42 KB)
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vm_object.h
(13.57 KB)
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vm_page.c
(143.85 KB)
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vm_page.h
(36.63 KB)
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vm_pageout.c
(68.44 KB)
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vm_pageout.h
(3.67 KB)
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vm_pagequeue.h
(17.26 KB)
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vm_pager.c
(12.76 KB)
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vm_pager.h
(8.59 KB)
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vm_param.h
(4.97 KB)
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vm_phys.c
(47.32 KB)
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vm_phys.h
(3.91 KB)
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vm_radix.c
(23.84 KB)
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vm_radix.h
(2.47 KB)
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vm_reserv.c
(42.79 KB)
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vm_reserv.h
(2.92 KB)
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vm_swapout.c
(23.8 KB)
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vm_swapout_dummy.c
(4.15 KB)
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vm_unix.c
(6.72 KB)
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vnode_pager.c
(43.39 KB)
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vnode_pager.h
(2.5 KB)
Editing: sg_pager.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2009 Hudson River Trading LLC * Written by: John H. Baldwin <jhb@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); /* * This pager manages OBJT_SG objects. These objects are backed by * a scatter/gather list of physical address ranges. */ #include <sys/param.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/rwlock.h> #include <sys/sglist.h> #include <sys/vmmeter.h> #include <vm/vm.h> #include <vm/vm_param.h> #include <vm/vm_object.h> #include <vm/vm_page.h> #include <vm/vm_pager.h> #include <vm/vm_phys.h> #include <vm/uma.h> static vm_object_t sg_pager_alloc(void *, vm_ooffset_t, vm_prot_t, vm_ooffset_t, struct ucred *); static void sg_pager_dealloc(vm_object_t); static int sg_pager_getpages(vm_object_t, vm_page_t *, int, int *, int *); static void sg_pager_putpages(vm_object_t, vm_page_t *, int, boolean_t, int *); static boolean_t sg_pager_haspage(vm_object_t, vm_pindex_t, int *, int *); struct pagerops sgpagerops = { .pgo_alloc = sg_pager_alloc, .pgo_dealloc = sg_pager_dealloc, .pgo_getpages = sg_pager_getpages, .pgo_putpages = sg_pager_putpages, .pgo_haspage = sg_pager_haspage, }; static vm_object_t sg_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t foff, struct ucred *cred) { struct sglist *sg; vm_object_t object; vm_pindex_t npages, pindex; int i; /* * Offset should be page aligned. */ if (foff & PAGE_MASK) return (NULL); /* * The scatter/gather list must only include page-aligned * ranges. */ npages = 0; sg = handle; for (i = 0; i < sg->sg_nseg; i++) { if ((sg->sg_segs[i].ss_paddr % PAGE_SIZE) != 0 || (sg->sg_segs[i].ss_len % PAGE_SIZE) != 0) return (NULL); npages += sg->sg_segs[i].ss_len / PAGE_SIZE; } /* * The scatter/gather list has a fixed size. Refuse requests * to map beyond that. */ size = round_page(size); pindex = OFF_TO_IDX(foff) + OFF_TO_IDX(size); if (pindex > npages || pindex < OFF_TO_IDX(foff) || pindex < OFF_TO_IDX(size)) return (NULL); /* * Allocate a new object and associate it with the * scatter/gather list. It is ok for our purposes to have * multiple VM objects associated with the same scatter/gather * list because scatter/gather lists are static. This is also * simpler than ensuring a unique object per scatter/gather * list. */ object = vm_object_allocate(OBJT_SG, npages); object->handle = sglist_hold(sg); TAILQ_INIT(&object->un_pager.sgp.sgp_pglist); return (object); } static void sg_pager_dealloc(vm_object_t object) { struct sglist *sg; vm_page_t m; /* * Free up our fake pages. */ while ((m = TAILQ_FIRST(&object->un_pager.sgp.sgp_pglist)) != 0) { if (vm_page_busy_acquire(m, VM_ALLOC_WAITFAIL) == 0) continue; TAILQ_REMOVE(&object->un_pager.sgp.sgp_pglist, m, plinks.q); vm_page_putfake(m); } sg = object->handle; sglist_free(sg); object->handle = NULL; object->type = OBJT_DEAD; } static int sg_pager_getpages(vm_object_t object, vm_page_t *m, int count, int *rbehind, int *rahead) { struct sglist *sg; vm_page_t m_paddr, page; vm_pindex_t offset; vm_paddr_t paddr; vm_memattr_t memattr; size_t space; int i; /* Since our haspage reports zero after/before, the count is 1. */ KASSERT(count == 1, ("%s: count %d", __func__, count)); /* Handle is stable while paging is in progress. */ sg = object->handle; memattr = object->memattr; offset = m[0]->pindex; /* * Lookup the physical address of the requested page. An initial * value of '1' instead of '0' is used so we can assert that the * page is found since '0' can be a valid page-aligned physical * address. */ space = 0; paddr = 1; for (i = 0; i < sg->sg_nseg; i++) { if (space + sg->sg_segs[i].ss_len <= (offset * PAGE_SIZE)) { space += sg->sg_segs[i].ss_len; continue; } paddr = sg->sg_segs[i].ss_paddr + offset * PAGE_SIZE - space; break; } KASSERT(paddr != 1, ("invalid SG page index")); /* If "paddr" is a real page, perform a sanity check on "memattr". */ if ((m_paddr = vm_phys_paddr_to_vm_page(paddr)) != NULL && pmap_page_get_memattr(m_paddr) != memattr) { memattr = pmap_page_get_memattr(m_paddr); printf( "WARNING: A device driver has set \"memattr\" inconsistently.\n"); } /* Return a fake page for the requested page. */ KASSERT(!(m[0]->flags & PG_FICTITIOUS), ("backing page for SG is fake")); /* Construct a new fake page. */ page = vm_page_getfake(paddr, memattr); VM_OBJECT_WLOCK(object); TAILQ_INSERT_TAIL(&object->un_pager.sgp.sgp_pglist, page, plinks.q); vm_page_replace(page, object, offset, m[0]); VM_OBJECT_WUNLOCK(object); m[0] = page; vm_page_valid(page); if (rbehind) *rbehind = 0; if (rahead) *rahead = 0; return (VM_PAGER_OK); } static void sg_pager_putpages(vm_object_t object, vm_page_t *m, int count, boolean_t sync, int *rtvals) { panic("sg_pager_putpage called"); } static boolean_t sg_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before, int *after) { if (before != NULL) *before = 0; if (after != NULL) *after = 0; return (TRUE); }
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