/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * University Copyright- Copyright (c) 1982, 1986, 1988 * The Regents of the University of California * All Rights Reserved * * University Acknowledgment- Portions of this document are derived from * software developed by the University of California, Berkeley, and its * contributors. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * VM - shared or copy-on-write from a vnode/anonymous memory. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Private seg op routines. */ static int segvn_dup(struct seg *seg, struct seg *newseg); static int segvn_unmap(struct seg *seg, caddr_t addr, size_t len); static void segvn_free(struct seg *seg); static faultcode_t segvn_fault(struct hat *hat, struct seg *seg, caddr_t addr, size_t len, enum fault_type type, enum seg_rw rw); static faultcode_t segvn_faulta(struct seg *seg, caddr_t addr); static int segvn_setprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot); static int segvn_checkprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot); static int segvn_kluster(struct seg *seg, caddr_t addr, ssize_t delta); static size_t segvn_swapout(struct seg *seg); static int segvn_sync(struct seg *seg, caddr_t addr, size_t len, int attr, uint_t flags); static size_t segvn_incore(struct seg *seg, caddr_t addr, size_t len, char *vec); static int segvn_lockop(struct seg *seg, caddr_t addr, size_t len, int attr, int op, ulong_t *lockmap, size_t pos); static int segvn_getprot(struct seg *seg, caddr_t addr, size_t len, uint_t *protv); static u_offset_t segvn_getoffset(struct seg *seg, caddr_t addr); static int segvn_gettype(struct seg *seg, caddr_t addr); static int segvn_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp); static int segvn_advise(struct seg *seg, caddr_t addr, size_t len, uint_t behav); static void segvn_dump(struct seg *seg); static int segvn_pagelock(struct seg *seg, caddr_t addr, size_t len, struct page ***ppp, enum lock_type type, enum seg_rw rw); static int segvn_setpagesize(struct seg *seg, caddr_t addr, size_t len, uint_t szc); static int segvn_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp); static lgrp_mem_policy_info_t *segvn_getpolicy(struct seg *, caddr_t); static int segvn_capable(struct seg *seg, segcapability_t capable); struct seg_ops segvn_ops = { segvn_dup, segvn_unmap, segvn_free, segvn_fault, segvn_faulta, segvn_setprot, segvn_checkprot, segvn_kluster, segvn_swapout, segvn_sync, segvn_incore, segvn_lockop, segvn_getprot, segvn_getoffset, segvn_gettype, segvn_getvp, segvn_advise, segvn_dump, segvn_pagelock, segvn_setpagesize, segvn_getmemid, segvn_getpolicy, segvn_capable, }; /* * Common zfod structures, provided as a shorthand for others to use. */ static segvn_crargs_t zfod_segvn_crargs = SEGVN_ZFOD_ARGS(PROT_ZFOD, PROT_ALL); static segvn_crargs_t kzfod_segvn_crargs = SEGVN_ZFOD_ARGS(PROT_ZFOD & ~PROT_USER, PROT_ALL & ~PROT_USER); static segvn_crargs_t stack_noexec_crargs = SEGVN_ZFOD_ARGS(PROT_ZFOD & ~PROT_EXEC, PROT_ALL); caddr_t zfod_argsp = (caddr_t)&zfod_segvn_crargs; /* user zfod argsp */ caddr_t kzfod_argsp = (caddr_t)&kzfod_segvn_crargs; /* kernel zfod argsp */ caddr_t stack_exec_argsp = (caddr_t)&zfod_segvn_crargs; /* executable stack */ caddr_t stack_noexec_argsp = (caddr_t)&stack_noexec_crargs; /* noexec stack */ #define vpgtob(n) ((n) * sizeof (struct vpage)) /* For brevity */ size_t segvn_comb_thrshld = UINT_MAX; /* patchable -- see 1196681 */ static int segvn_concat(struct seg *, struct seg *, int); static int segvn_extend_prev(struct seg *, struct seg *, struct segvn_crargs *, size_t); static int segvn_extend_next(struct seg *, struct seg *, struct segvn_crargs *, size_t); static void segvn_softunlock(struct seg *, caddr_t, size_t, enum seg_rw); static void segvn_pagelist_rele(page_t **); static void segvn_setvnode_mpss(vnode_t *); static void segvn_relocate_pages(page_t **, page_t *); static int segvn_full_szcpages(page_t **, uint_t, int *, uint_t *); static int segvn_fill_vp_pages(struct segvn_data *, vnode_t *, u_offset_t, uint_t, page_t **, page_t **, uint_t *, int *); static faultcode_t segvn_fault_vnodepages(struct hat *, struct seg *, caddr_t, caddr_t, enum fault_type, enum seg_rw, caddr_t, caddr_t, int); static faultcode_t segvn_fault_anonpages(struct hat *, struct seg *, caddr_t, caddr_t, enum fault_type, enum seg_rw, caddr_t, caddr_t, int); static faultcode_t segvn_faultpage(struct hat *, struct seg *, caddr_t, u_offset_t, struct vpage *, page_t **, uint_t, enum fault_type, enum seg_rw, int); static void segvn_vpage(struct seg *); static void segvn_purge(struct seg *seg); static int segvn_reclaim(struct seg *, caddr_t, size_t, struct page **, enum seg_rw); static int sameprot(struct seg *, caddr_t, size_t); static int segvn_demote_range(struct seg *, caddr_t, size_t, int); static int segvn_clrszc(struct seg *); static struct seg *segvn_split_seg(struct seg *, caddr_t); static int segvn_claim_pages(struct seg *, struct vpage *, u_offset_t, ulong_t, uint_t); static struct kmem_cache *segvn_cache; #ifdef VM_STATS static struct segvnvmstats_str { ulong_t fill_vp_pages[31]; ulong_t fltvnpages[49]; ulong_t fullszcpages[10]; ulong_t relocatepages[3]; ulong_t fltanpages[17]; ulong_t pagelock[3]; ulong_t demoterange[3]; } segvnvmstats; #endif /* VM_STATS */ #define SDR_RANGE 1 /* demote entire range */ #define SDR_END 2 /* demote non aligned ends only */ #define CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr) { \ if ((len) != 0) { \ lpgaddr = (caddr_t)P2ALIGN((uintptr_t)(addr), pgsz); \ ASSERT(lpgaddr >= (seg)->s_base); \ lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)((addr) + \ (len)), pgsz); \ ASSERT(lpgeaddr > lpgaddr); \ ASSERT(lpgeaddr <= (seg)->s_base + (seg)->s_size); \ } else { \ lpgeaddr = lpgaddr = (addr); \ } \ } /*ARGSUSED*/ static int segvn_cache_constructor(void *buf, void *cdrarg, int kmflags) { struct segvn_data *svd = buf; rw_init(&svd->lock, NULL, RW_DEFAULT, NULL); mutex_init(&svd->segp_slock, NULL, MUTEX_DEFAULT, NULL); return (0); } /*ARGSUSED1*/ static void segvn_cache_destructor(void *buf, void *cdrarg) { struct segvn_data *svd = buf; rw_destroy(&svd->lock); mutex_destroy(&svd->segp_slock); } /* * Patching this variable to non-zero allows the system to run with * stacks marked as "not executable". It's a bit of a kludge, but is * provided as a tweakable for platforms that export those ABIs * (e.g. sparc V8) that have executable stacks enabled by default. * There are also some restrictions for platforms that don't actually * implement 'noexec' protections. * * Once enabled, the system is (therefore) unable to provide a fully * ABI-compliant execution environment, though practically speaking, * most everything works. The exceptions are generally some interpreters * and debuggers that create executable code on the stack and jump * into it (without explicitly mprotecting the address range to include * PROT_EXEC). * * One important class of applications that are disabled are those * that have been transformed into malicious agents using one of the * numerous "buffer overflow" attacks. See 4007890. */ int noexec_user_stack = 0; int noexec_user_stack_log = 1; int segvn_lpg_disable = 0; uint_t segvn_maxpgszc = 0; ulong_t segvn_vmpss_clrszc_cnt; ulong_t segvn_vmpss_clrszc_err; ulong_t segvn_fltvnpages_clrszc_cnt; ulong_t segvn_fltvnpages_clrszc_err; ulong_t segvn_setpgsz_align_err; ulong_t segvn_setpgsz_getattr_err; ulong_t segvn_setpgsz_eof_err; ulong_t segvn_faultvnmpss_align_err1; ulong_t segvn_faultvnmpss_align_err2; ulong_t segvn_faultvnmpss_align_err3; ulong_t segvn_faultvnmpss_align_err4; ulong_t segvn_faultvnmpss_align_err5; ulong_t segvn_vmpss_pageio_deadlk_err; /* * Initialize segvn data structures */ void segvn_init(void) { uint_t maxszc; uint_t szc; size_t pgsz; segvn_cache = kmem_cache_create("segvn_cache", sizeof (struct segvn_data), 0, segvn_cache_constructor, segvn_cache_destructor, NULL, NULL, NULL, 0); if (segvn_lpg_disable != 0) return; szc = maxszc = page_num_pagesizes() - 1; if (szc == 0) { segvn_lpg_disable = 1; return; } if (page_get_pagesize(0) != PAGESIZE) { panic("segvn_init: bad szc 0"); /*NOTREACHED*/ } while (szc != 0) { pgsz = page_get_pagesize(szc); if (pgsz <= PAGESIZE || !IS_P2ALIGNED(pgsz, pgsz)) { panic("segvn_init: bad szc %d", szc); /*NOTREACHED*/ } szc--; } if (segvn_maxpgszc == 0 || segvn_maxpgszc > maxszc) segvn_maxpgszc = maxszc; } #define SEGVN_PAGEIO ((void *)0x1) #define SEGVN_NOPAGEIO ((void *)0x2) static void segvn_setvnode_mpss(vnode_t *vp) { int err; ASSERT(vp->v_mpssdata == NULL || vp->v_mpssdata == SEGVN_PAGEIO || vp->v_mpssdata == SEGVN_NOPAGEIO); if (vp->v_mpssdata == NULL) { if (vn_vmpss_usepageio(vp)) { err = VOP_PAGEIO(vp, (page_t *)NULL, (u_offset_t)0, 0, 0, CRED()); } else { err = ENOSYS; } /* * set v_mpssdata just once per vnode life * so that it never changes. */ mutex_enter(&vp->v_lock); if (vp->v_mpssdata == NULL) { if (err == EINVAL) { vp->v_mpssdata = SEGVN_PAGEIO; } else { vp->v_mpssdata = SEGVN_NOPAGEIO; } } mutex_exit(&vp->v_lock); } } int segvn_create(struct seg *seg, void *argsp) { struct segvn_crargs *a = (struct segvn_crargs *)argsp; struct segvn_data *svd; size_t swresv = 0; struct cred *cred; struct anon_map *amp; int error = 0; size_t pgsz; lgrp_mem_policy_t mpolicy = LGRP_MEM_POLICY_DEFAULT; ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); if (a->type != MAP_PRIVATE && a->type != MAP_SHARED) { panic("segvn_create type"); /*NOTREACHED*/ } /* * Check arguments. If a shared anon structure is given then * it is illegal to also specify a vp. */ if (a->amp != NULL && a->vp != NULL) { panic("segvn_create anon_map"); /*NOTREACHED*/ } /* MAP_NORESERVE on a MAP_SHARED segment is meaningless. */ if (a->type == MAP_SHARED) a->flags &= ~MAP_NORESERVE; if (a->szc != 0) { if (segvn_lpg_disable != 0 || a->amp != NULL || (a->type == MAP_SHARED && a->vp == NULL) || (a->flags & MAP_NORESERVE) || seg->s_as == &kas) { a->szc = 0; } else { if (a->szc > segvn_maxpgszc) a->szc = segvn_maxpgszc; pgsz = page_get_pagesize(a->szc); if (!IS_P2ALIGNED(seg->s_base, pgsz) || !IS_P2ALIGNED(seg->s_size, pgsz)) { a->szc = 0; } else if (a->vp != NULL) { extern struct vnode kvp; if (IS_SWAPFSVP(a->vp) || a->vp == &kvp) { /* * paranoid check. * hat_page_demote() is not supported * on swapfs pages. */ a->szc = 0; } else if (map_addr_vacalign_check(seg->s_base, a->offset & PAGEMASK)) { a->szc = 0; } } } } /* * If segment may need private pages, reserve them now. */ if (!(a->flags & MAP_NORESERVE) && ((a->vp == NULL && a->amp == NULL) || (a->type == MAP_PRIVATE && (a->prot & PROT_WRITE)))) { if (anon_resv(seg->s_size) == 0) return (EAGAIN); swresv = seg->s_size; TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, swresv, 1); } /* * Reserve any mapping structures that may be required. */ hat_map(seg->s_as->a_hat, seg->s_base, seg->s_size, HAT_MAP); if (a->cred) { cred = a->cred; crhold(cred); } else { crhold(cred = CRED()); } /* Inform the vnode of the new mapping */ if (a->vp) { error = VOP_ADDMAP(a->vp, a->offset & PAGEMASK, seg->s_as, seg->s_base, seg->s_size, a->prot, a->maxprot, a->type, cred); if (error) { if (swresv != 0) { anon_unresv(swresv); TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, swresv, 0); } crfree(cred); hat_unload(seg->s_as->a_hat, seg->s_base, seg->s_size, HAT_UNLOAD_UNMAP); return (error); } } /* * If more than one segment in the address space, and * they're adjacent virtually, try to concatenate them. * Don't concatenate if an explicit anon_map structure * was supplied (e.g., SystemV shared memory). */ if (a->amp == NULL) { struct seg *pseg, *nseg; struct segvn_data *psvd, *nsvd; lgrp_mem_policy_t ppolicy, npolicy; uint_t lgrp_mem_policy_flags = 0; extern lgrp_mem_policy_t lgrp_mem_default_policy; /* * Memory policy flags (lgrp_mem_policy_flags) is valid when * extending stack/heap segments. */ if ((a->vp == NULL) && (a->type == MAP_PRIVATE) && !(a->flags & MAP_NORESERVE) && (seg->s_as != &kas)) { lgrp_mem_policy_flags = a->lgrp_mem_policy_flags; } else { /* * Get policy when not extending it from another segment */ mpolicy = lgrp_mem_policy_default(seg->s_size, a->type); } /* * First, try to concatenate the previous and new segments */ pseg = AS_SEGPREV(seg->s_as, seg); if (pseg != NULL && pseg->s_base + pseg->s_size == seg->s_base && pseg->s_ops == &segvn_ops) { /* * Get memory allocation policy from previous segment. * When extension is specified (e.g. for heap) apply * this policy to the new segment regardless of the * outcome of segment concatenation. Extension occurs * for non-default policy otherwise default policy is * used and is based on extended segment size. */ psvd = (struct segvn_data *)pseg->s_data; ppolicy = psvd->policy_info.mem_policy; if (lgrp_mem_policy_flags == LGRP_MP_FLAG_EXTEND_UP) { if (ppolicy != lgrp_mem_default_policy) { mpolicy = ppolicy; } else { mpolicy = lgrp_mem_policy_default( pseg->s_size + seg->s_size, a->type); } } if (mpolicy == ppolicy && (pseg->s_size + seg->s_size <= segvn_comb_thrshld || psvd->amp == NULL) && segvn_extend_prev(pseg, seg, a, swresv) == 0) { /* * success! now try to concatenate * with following seg */ crfree(cred); nseg = AS_SEGNEXT(pseg->s_as, pseg); if (nseg != NULL && nseg != pseg && nseg->s_ops == &segvn_ops && pseg->s_base + pseg->s_size == nseg->s_base) (void) segvn_concat(pseg, nseg, 0); ASSERT(pseg->s_szc == 0 || (a->szc == pseg->s_szc && IS_P2ALIGNED(pseg->s_base, pgsz) && IS_P2ALIGNED(pseg->s_size, pgsz))); return (0); } } /* * Failed, so try to concatenate with following seg */ nseg = AS_SEGNEXT(seg->s_as, seg); if (nseg != NULL && seg->s_base + seg->s_size == nseg->s_base && nseg->s_ops == &segvn_ops) { /* * Get memory allocation policy from next segment. * When extension is specified (e.g. for stack) apply * this policy to the new segment regardless of the * outcome of segment concatenation. Extension occurs * for non-default policy otherwise default policy is * used and is based on extended segment size. */ nsvd = (struct segvn_data *)nseg->s_data; npolicy = nsvd->policy_info.mem_policy; if (lgrp_mem_policy_flags == LGRP_MP_FLAG_EXTEND_DOWN) { if (npolicy != lgrp_mem_default_policy) { mpolicy = npolicy; } else { mpolicy = lgrp_mem_policy_default( nseg->s_size + seg->s_size, a->type); } } if (mpolicy == npolicy && segvn_extend_next(seg, nseg, a, swresv) == 0) { crfree(cred); ASSERT(nseg->s_szc == 0 || (a->szc == nseg->s_szc && IS_P2ALIGNED(nseg->s_base, pgsz) && IS_P2ALIGNED(nseg->s_size, pgsz))); return (0); } } } if (a->vp != NULL) { VN_HOLD(a->vp); if (a->type == MAP_SHARED) lgrp_shm_policy_init(NULL, a->vp); } svd = kmem_cache_alloc(segvn_cache, KM_SLEEP); seg->s_ops = &segvn_ops; seg->s_data = (void *)svd; seg->s_szc = a->szc; svd->vp = a->vp; /* * Anonymous mappings have no backing file so the offset is meaningless. */ svd->offset = a->vp ? (a->offset & PAGEMASK) : 0; svd->prot = a->prot; svd->maxprot = a->maxprot; svd->pageprot = 0; svd->type = a->type; svd->vpage = NULL; svd->cred = cred; svd->advice = MADV_NORMAL; svd->pageadvice = 0; svd->flags = (ushort_t)a->flags; svd->softlockcnt = 0; if (a->szc != 0 && a->vp != NULL) { segvn_setvnode_mpss(a->vp); } amp = a->amp; if ((svd->amp = amp) == NULL) { svd->anon_index = 0; if (svd->type == MAP_SHARED) { svd->swresv = 0; /* * Shared mappings to a vp need no other setup. * If we have a shared mapping to an anon_map object * which hasn't been allocated yet, allocate the * struct now so that it will be properly shared * by remembering the swap reservation there. */ if (a->vp == NULL) { svd->amp = anonmap_alloc(seg->s_size, swresv); svd->amp->a_szc = seg->s_szc; } } else { /* * Private mapping (with or without a vp). * Allocate anon_map when needed. */ svd->swresv = swresv; } } else { pgcnt_t anon_num; /* * Mapping to an existing anon_map structure without a vp. * For now we will insure that the segment size isn't larger * than the size - offset gives us. Later on we may wish to * have the anon array dynamically allocated itself so that * we don't always have to allocate all the anon pointer slots. * This of course involves adding extra code to check that we * aren't trying to use an anon pointer slot beyond the end * of the currently allocated anon array. */ if ((amp->size - a->offset) < seg->s_size) { panic("segvn_create anon_map size"); /*NOTREACHED*/ } anon_num = btopr(a->offset); if (a->type == MAP_SHARED) { /* * SHARED mapping to a given anon_map. */ ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); amp->refcnt++; ANON_LOCK_EXIT(&->a_rwlock); svd->anon_index = anon_num; svd->swresv = 0; } else { /* * PRIVATE mapping to a given anon_map. * Make sure that all the needed anon * structures are created (so that we will * share the underlying pages if nothing * is written by this mapping) and then * duplicate the anon array as is done * when a privately mapped segment is dup'ed. */ struct anon *ap; caddr_t addr; caddr_t eaddr; ulong_t anon_idx; int hat_flag = HAT_LOAD; if (svd->flags & MAP_TEXT) { hat_flag |= HAT_LOAD_TEXT; } svd->amp = anonmap_alloc(seg->s_size, 0); svd->amp->a_szc = seg->s_szc; svd->anon_index = 0; svd->swresv = swresv; /* * Prevent 2 threads from allocating anon * slots simultaneously. */ ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); eaddr = seg->s_base + seg->s_size; for (anon_idx = anon_num, addr = seg->s_base; addr < eaddr; addr += PAGESIZE, anon_idx++) { page_t *pp; if ((ap = anon_get_ptr(amp->ahp, anon_idx)) != NULL) continue; /* * Allocate the anon struct now. * Might as well load up translation * to the page while we're at it... */ pp = anon_zero(seg, addr, &ap, cred); if (ap == NULL || pp == NULL) { panic("segvn_create anon_zero"); /*NOTREACHED*/ } /* * Re-acquire the anon_map lock and * initialize the anon array entry. */ ASSERT(anon_get_ptr(amp->ahp, anon_idx) == NULL); (void) anon_set_ptr(amp->ahp, anon_idx, ap, ANON_SLEEP); ASSERT(seg->s_szc == 0); ASSERT(!IS_VMODSORT(pp->p_vnode)); hat_memload(seg->s_as->a_hat, addr, pp, svd->prot & ~PROT_WRITE, hat_flag); page_unlock(pp); } ASSERT(seg->s_szc == 0); anon_dup(amp->ahp, anon_num, svd->amp->ahp, 0, seg->s_size); ANON_LOCK_EXIT(&->a_rwlock); } } /* * Set default memory allocation policy for segment * * Always set policy for private memory at least for initialization * even if this is a shared memory segment */ (void) lgrp_privm_policy_set(mpolicy, &svd->policy_info, seg->s_size); if (svd->type == MAP_SHARED) (void) lgrp_shm_policy_set(mpolicy, svd->amp, svd->anon_index, svd->vp, svd->offset, seg->s_size); return (0); } /* * Concatenate two existing segments, if possible. * Return 0 on success, -1 if two segments are not compatible * or -2 on memory allocation failure. * If private == 1 then try and concat segments with private pages. */ static int segvn_concat(struct seg *seg1, struct seg *seg2, int private) { struct segvn_data *svd1 = seg1->s_data; struct segvn_data *svd2 = seg2->s_data; struct anon_map *amp1 = svd1->amp; struct anon_map *amp2 = svd2->amp; struct vpage *vpage1 = svd1->vpage; struct vpage *vpage2 = svd2->vpage, *nvpage = NULL; size_t size, nvpsize; pgcnt_t npages1, npages2; ASSERT(seg1->s_as && seg2->s_as && seg1->s_as == seg2->s_as); ASSERT(AS_WRITE_HELD(seg1->s_as, &seg1->s_as->a_lock)); ASSERT(seg1->s_ops == seg2->s_ops); /* both segments exist, try to merge them */ #define incompat(x) (svd1->x != svd2->x) if (incompat(vp) || incompat(maxprot) || (!svd1->pageadvice && !svd2->pageadvice && incompat(advice)) || (!svd1->pageprot && !svd2->pageprot && incompat(prot)) || incompat(type) || incompat(cred) || incompat(flags) || seg1->s_szc != seg2->s_szc || incompat(policy_info.mem_policy) || (svd2->softlockcnt > 0)) return (-1); #undef incompat /* * vp == NULL implies zfod, offset doesn't matter */ if (svd1->vp != NULL && svd1->offset + seg1->s_size != svd2->offset) { return (-1); } /* * Fail early if we're not supposed to concatenate * private pages. */ if ((private == 0 || svd1->type != MAP_PRIVATE) && (amp1 != NULL || amp2 != NULL)) { return (-1); } /* * If either seg has vpages, create a new merged vpage array. */ if (vpage1 != NULL || vpage2 != NULL) { struct vpage *vp; npages1 = seg_pages(seg1); npages2 = seg_pages(seg2); nvpsize = vpgtob(npages1 + npages2); if ((nvpage = kmem_zalloc(nvpsize, KM_NOSLEEP)) == NULL) { return (-2); } if (vpage1 != NULL) { bcopy(vpage1, nvpage, vpgtob(npages1)); } if (vpage2 != NULL) { bcopy(vpage2, nvpage + npages1, vpgtob(npages2)); } for (vp = nvpage; vp < nvpage + npages1; vp++) { if (svd2->pageprot && !svd1->pageprot) { VPP_SETPROT(vp, svd1->prot); } if (svd2->pageadvice && !svd1->pageadvice) { VPP_SETADVICE(vp, svd1->advice); } } for (vp = nvpage + npages1; vp < nvpage + npages1 + npages2; vp++) { if (svd1->pageprot && !svd2->pageprot) { VPP_SETPROT(vp, svd2->prot); } if (svd1->pageadvice && !svd2->pageadvice) { VPP_SETADVICE(vp, svd2->advice); } } } /* * If either segment has private pages, create a new merged anon * array. */ if (amp1 != NULL || amp2 != NULL) { struct anon_hdr *nahp; struct anon_map *namp = NULL; size_t asize = seg1->s_size + seg2->s_size; if ((nahp = anon_create(btop(asize), ANON_NOSLEEP)) == NULL) { if (nvpage != NULL) { kmem_free(nvpage, nvpsize); } return (-2); } if (amp1 != NULL) { /* * XXX anon rwlock is not really needed because * this is a private segment and we are writers. */ ANON_LOCK_ENTER(&1->a_rwlock, RW_WRITER); ASSERT(amp1->refcnt == 1); if (anon_copy_ptr(amp1->ahp, svd1->anon_index, nahp, 0, btop(seg1->s_size), ANON_NOSLEEP)) { anon_release(nahp, btop(asize)); ANON_LOCK_EXIT(&1->a_rwlock); if (nvpage != NULL) { kmem_free(nvpage, nvpsize); } return (-2); } } if (amp2 != NULL) { ANON_LOCK_ENTER(&2->a_rwlock, RW_WRITER); ASSERT(amp2->refcnt == 1); if (anon_copy_ptr(amp2->ahp, svd2->anon_index, nahp, btop(seg1->s_size), btop(seg2->s_size), ANON_NOSLEEP)) { anon_release(nahp, btop(asize)); ANON_LOCK_EXIT(&2->a_rwlock); if (amp1 != NULL) { ANON_LOCK_EXIT(&1->a_rwlock); } if (nvpage != NULL) { kmem_free(nvpage, nvpsize); } return (-2); } } if (amp1 != NULL) { namp = amp1; anon_release(amp1->ahp, btop(amp1->size)); } if (amp2 != NULL) { if (namp == NULL) { ASSERT(amp1 == NULL); namp = amp2; anon_release(amp2->ahp, btop(amp2->size)); } else { amp2->refcnt--; ANON_LOCK_EXIT(&2->a_rwlock); anonmap_free(amp2); } svd2->amp = NULL; /* needed for seg_free */ } namp->ahp = nahp; namp->size = asize; svd1->amp = namp; svd1->anon_index = 0; ANON_LOCK_EXIT(&namp->a_rwlock); } /* * Now free the old vpage structures. */ if (nvpage != NULL) { if (vpage1 != NULL) { kmem_free(vpage1, vpgtob(npages1)); } if (vpage2 != NULL) { svd2->vpage = NULL; kmem_free(vpage2, vpgtob(npages2)); } if (svd2->pageprot) { svd1->pageprot = 1; } if (svd2->pageadvice) { svd1->pageadvice = 1; } svd1->vpage = nvpage; } /* all looks ok, merge segments */ svd1->swresv += svd2->swresv; svd2->swresv = 0; /* so seg_free doesn't release swap space */ size = seg2->s_size; seg_free(seg2); seg1->s_size += size; return (0); } /* * Extend the previous segment (seg1) to include the * new segment (seg2 + a), if possible. * Return 0 on success. */ static int segvn_extend_prev(seg1, seg2, a, swresv) struct seg *seg1, *seg2; struct segvn_crargs *a; size_t swresv; { struct segvn_data *svd1 = (struct segvn_data *)seg1->s_data; size_t size; struct anon_map *amp1; struct vpage *new_vpage; /* * We don't need any segment level locks for "segvn" data * since the address space is "write" locked. */ ASSERT(seg1->s_as && AS_WRITE_HELD(seg1->s_as, &seg1->s_as->a_lock)); /* second segment is new, try to extend first */ /* XXX - should also check cred */ if (svd1->vp != a->vp || svd1->maxprot != a->maxprot || (!svd1->pageprot && (svd1->prot != a->prot)) || svd1->type != a->type || svd1->flags != a->flags || seg1->s_szc != a->szc) return (-1); /* vp == NULL implies zfod, offset doesn't matter */ if (svd1->vp != NULL && svd1->offset + seg1->s_size != (a->offset & PAGEMASK)) return (-1); amp1 = svd1->amp; if (amp1) { pgcnt_t newpgs; /* * Segment has private pages, can data structures * be expanded? * * Acquire the anon_map lock to prevent it from changing, * if it is shared. This ensures that the anon_map * will not change while a thread which has a read/write * lock on an address space references it. * XXX - Don't need the anon_map lock at all if "refcnt" * is 1. * * Can't grow a MAP_SHARED segment with an anonmap because * there may be existing anon slots where we want to extend * the segment and we wouldn't know what to do with them * (e.g., for tmpfs right thing is to just leave them there, * for /dev/zero they should be cleared out). */ if (svd1->type == MAP_SHARED) return (-1); ANON_LOCK_ENTER(&1->a_rwlock, RW_WRITER); if (amp1->refcnt > 1) { ANON_LOCK_EXIT(&1->a_rwlock); return (-1); } newpgs = anon_grow(amp1->ahp, &svd1->anon_index, btop(seg1->s_size), btop(seg2->s_size), ANON_NOSLEEP); if (newpgs == 0) { ANON_LOCK_EXIT(&1->a_rwlock); return (-1); } amp1->size = ptob(newpgs); ANON_LOCK_EXIT(&1->a_rwlock); } if (svd1->vpage != NULL) { new_vpage = kmem_zalloc(vpgtob(seg_pages(seg1) + seg_pages(seg2)), KM_NOSLEEP); if (new_vpage == NULL) return (-1); bcopy(svd1->vpage, new_vpage, vpgtob(seg_pages(seg1))); kmem_free(svd1->vpage, vpgtob(seg_pages(seg1))); svd1->vpage = new_vpage; if (svd1->pageprot) { struct vpage *vp, *evp; vp = new_vpage + seg_pages(seg1); evp = vp + seg_pages(seg2); for (; vp < evp; vp++) VPP_SETPROT(vp, a->prot); } } size = seg2->s_size; seg_free(seg2); seg1->s_size += size; svd1->swresv += swresv; return (0); } /* * Extend the next segment (seg2) to include the * new segment (seg1 + a), if possible. * Return 0 on success. */ static int segvn_extend_next( struct seg *seg1, struct seg *seg2, struct segvn_crargs *a, size_t swresv) { struct segvn_data *svd2 = (struct segvn_data *)seg2->s_data; size_t size; struct anon_map *amp2; struct vpage *new_vpage; /* * We don't need any segment level locks for "segvn" data * since the address space is "write" locked. */ ASSERT(seg2->s_as && AS_WRITE_HELD(seg2->s_as, &seg2->s_as->a_lock)); /* first segment is new, try to extend second */ /* XXX - should also check cred */ if (svd2->vp != a->vp || svd2->maxprot != a->maxprot || (!svd2->pageprot && (svd2->prot != a->prot)) || svd2->type != a->type || svd2->flags != a->flags || seg2->s_szc != a->szc) return (-1); /* vp == NULL implies zfod, offset doesn't matter */ if (svd2->vp != NULL && (a->offset & PAGEMASK) + seg1->s_size != svd2->offset) return (-1); amp2 = svd2->amp; if (amp2) { pgcnt_t newpgs; /* * Segment has private pages, can data structures * be expanded? * * Acquire the anon_map lock to prevent it from changing, * if it is shared. This ensures that the anon_map * will not change while a thread which has a read/write * lock on an address space references it. * * XXX - Don't need the anon_map lock at all if "refcnt" * is 1. */ if (svd2->type == MAP_SHARED) return (-1); ANON_LOCK_ENTER(&2->a_rwlock, RW_WRITER); if (amp2->refcnt > 1) { ANON_LOCK_EXIT(&2->a_rwlock); return (-1); } newpgs = anon_grow(amp2->ahp, &svd2->anon_index, btop(seg2->s_size), btop(seg1->s_size), ANON_NOSLEEP | ANON_GROWDOWN); if (newpgs == 0) { ANON_LOCK_EXIT(&2->a_rwlock); return (-1); } amp2->size = ptob(newpgs); ANON_LOCK_EXIT(&2->a_rwlock); } if (svd2->vpage != NULL) { new_vpage = kmem_zalloc(vpgtob(seg_pages(seg1) + seg_pages(seg2)), KM_NOSLEEP); if (new_vpage == NULL) { /* Not merging segments so adjust anon_index back */ if (amp2) svd2->anon_index += seg_pages(seg1); return (-1); } bcopy(svd2->vpage, new_vpage + seg_pages(seg1), vpgtob(seg_pages(seg2))); kmem_free(svd2->vpage, vpgtob(seg_pages(seg2))); svd2->vpage = new_vpage; if (svd2->pageprot) { struct vpage *vp, *evp; vp = new_vpage; evp = vp + seg_pages(seg1); for (; vp < evp; vp++) VPP_SETPROT(vp, a->prot); } } size = seg1->s_size; seg_free(seg1); seg2->s_size += size; seg2->s_base -= size; svd2->offset -= size; svd2->swresv += swresv; return (0); } static int segvn_dup(struct seg *seg, struct seg *newseg) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct segvn_data *newsvd; pgcnt_t npages = seg_pages(seg); int error = 0; uint_t prot; size_t len; ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); /* * If segment has anon reserved, reserve more for the new seg. * For a MAP_NORESERVE segment swresv will be a count of all the * allocated anon slots; thus we reserve for the child as many slots * as the parent has allocated. This semantic prevents the child or * parent from dieing during a copy-on-write fault caused by trying * to write a shared pre-existing anon page. */ if ((len = svd->swresv) != 0) { if (anon_resv(svd->swresv) == 0) return (ENOMEM); TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, len, 0); } newsvd = kmem_cache_alloc(segvn_cache, KM_SLEEP); newseg->s_ops = &segvn_ops; newseg->s_data = (void *)newsvd; newseg->s_szc = seg->s_szc; if ((newsvd->vp = svd->vp) != NULL) { VN_HOLD(svd->vp); if (svd->type == MAP_SHARED) lgrp_shm_policy_init(NULL, svd->vp); } newsvd->offset = svd->offset; newsvd->prot = svd->prot; newsvd->maxprot = svd->maxprot; newsvd->pageprot = svd->pageprot; newsvd->type = svd->type; newsvd->cred = svd->cred; crhold(newsvd->cred); newsvd->advice = svd->advice; newsvd->pageadvice = svd->pageadvice; newsvd->swresv = svd->swresv; newsvd->flags = svd->flags; newsvd->softlockcnt = 0; newsvd->policy_info = svd->policy_info; if ((newsvd->amp = svd->amp) == NULL) { /* * Not attaching to a shared anon object. */ newsvd->anon_index = 0; } else { struct anon_map *amp; amp = svd->amp; if (svd->type == MAP_SHARED) { ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); amp->refcnt++; ANON_LOCK_EXIT(&->a_rwlock); newsvd->anon_index = svd->anon_index; } else { int reclaim = 1; /* * Allocate and initialize new anon_map structure. */ newsvd->amp = anonmap_alloc(newseg->s_size, 0); newsvd->amp->a_szc = newseg->s_szc; newsvd->anon_index = 0; /* * We don't have to acquire the anon_map lock * for the new segment (since it belongs to an * address space that is still not associated * with any process), or the segment in the old * address space (since all threads in it * are stopped while duplicating the address space). */ /* * The goal of the following code is to make sure that * softlocked pages do not end up as copy on write * pages. This would cause problems where one * thread writes to a page that is COW and a different * thread in the same process has softlocked it. The * softlock lock would move away from this process * because the write would cause this process to get * a copy (without the softlock). * * The strategy here is to just break the * sharing on pages that could possibly be * softlocked. */ retry: if (svd->softlockcnt) { struct anon *ap, *newap; size_t i; uint_t vpprot; page_t *anon_pl[1+1], *pp; caddr_t addr; ulong_t anon_idx = 0; /* * The softlock count might be non zero * because some pages are still stuck in the * cache for lazy reclaim. Flush the cache * now. This should drop the count to zero. * [or there is really I/O going on to these * pages]. Note, we have the writers lock so * nothing gets inserted during the flush. */ if (reclaim == 1) { segvn_purge(seg); reclaim = 0; goto retry; } i = btopr(seg->s_size); addr = seg->s_base; /* * XXX break cow sharing using PAGESIZE * pages. They will be relocated into larger * pages at fault time. */ while (i-- > 0) { if (ap = anon_get_ptr(amp->ahp, anon_idx)) { error = anon_getpage(&ap, &vpprot, anon_pl, PAGESIZE, seg, addr, S_READ, svd->cred); if (error) { newsvd->vpage = NULL; goto out; } /* * prot need not be computed * below 'cause anon_private is * going to ignore it anyway * as child doesn't inherit * pagelock from parent. */ prot = svd->pageprot ? VPP_PROT( &svd->vpage[ seg_page(seg, addr)]) : svd->prot; pp = anon_private(&newap, newseg, addr, prot, anon_pl[0], 0, newsvd->cred); if (pp == NULL) { /* no mem abort */ newsvd->vpage = NULL; error = ENOMEM; goto out; } (void) anon_set_ptr( newsvd->amp->ahp, anon_idx, newap, ANON_SLEEP); page_unlock(pp); } addr += PAGESIZE; anon_idx++; } } else { /* common case */ if (seg->s_szc != 0) { /* * If at least one of anon slots of a * large page exists then make sure * all anon slots of a large page * exist to avoid partial cow sharing * of a large page in the future. */ anon_dup_fill_holes(amp->ahp, svd->anon_index, newsvd->amp->ahp, 0, seg->s_size, seg->s_szc, svd->vp != NULL); } else { anon_dup(amp->ahp, svd->anon_index, newsvd->amp->ahp, 0, seg->s_size); } hat_clrattr(seg->s_as->a_hat, seg->s_base, seg->s_size, PROT_WRITE); } } } /* * If necessary, create a vpage structure for the new segment. * Do not copy any page lock indications. */ if (svd->vpage != NULL) { uint_t i; struct vpage *ovp = svd->vpage; struct vpage *nvp; nvp = newsvd->vpage = kmem_alloc(vpgtob(npages), KM_SLEEP); for (i = 0; i < npages; i++) { *nvp = *ovp++; VPP_CLRPPLOCK(nvp++); } } else newsvd->vpage = NULL; /* Inform the vnode of the new mapping */ if (newsvd->vp != NULL) { error = VOP_ADDMAP(newsvd->vp, (offset_t)newsvd->offset, newseg->s_as, newseg->s_base, newseg->s_size, newsvd->prot, newsvd->maxprot, newsvd->type, newsvd->cred); } out: return (error); } /* * callback function used by segvn_unmap to invoke free_vp_pages() for only * those pages actually processed by the HAT */ extern int free_pages; static void segvn_hat_unload_callback(hat_callback_t *cb) { struct seg *seg = cb->hcb_data; struct segvn_data *svd = (struct segvn_data *)seg->s_data; size_t len; u_offset_t off; ASSERT(svd->vp != NULL); ASSERT(cb->hcb_end_addr > cb->hcb_start_addr); ASSERT(cb->hcb_start_addr >= seg->s_base); len = cb->hcb_end_addr - cb->hcb_start_addr; off = cb->hcb_start_addr - seg->s_base; free_vp_pages(svd->vp, svd->offset + off, len); } static int segvn_unmap(struct seg *seg, caddr_t addr, size_t len) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct segvn_data *nsvd; struct seg *nseg; struct anon_map *amp; pgcnt_t opages; /* old segment size in pages */ pgcnt_t npages; /* new segment size in pages */ pgcnt_t dpages; /* pages being deleted (unmapped) */ hat_callback_t callback; /* used for free_vp_pages() */ hat_callback_t *cbp = NULL; caddr_t nbase; size_t nsize; size_t oswresv; int reclaim = 1; /* * We don't need any segment level locks for "segvn" data * since the address space is "write" locked. */ ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); /* * Fail the unmap if pages are SOFTLOCKed through this mapping. * softlockcnt is protected from change by the as write lock. */ retry: if (svd->softlockcnt > 0) { /* * since we do have the writers lock nobody can fill * the cache during the purge. The flush either succeeds * or we still have pending I/Os. */ if (reclaim == 1) { segvn_purge(seg); reclaim = 0; goto retry; } return (EAGAIN); } /* * Check for bad sizes */ if (addr < seg->s_base || addr + len > seg->s_base + seg->s_size || (len & PAGEOFFSET) || ((uintptr_t)addr & PAGEOFFSET)) { panic("segvn_unmap"); /*NOTREACHED*/ } if (seg->s_szc != 0) { size_t pgsz = page_get_pagesize(seg->s_szc); int err; if (!IS_P2ALIGNED(addr, pgsz) || !IS_P2ALIGNED(len, pgsz)) { ASSERT(seg->s_base != addr || seg->s_size != len); VM_STAT_ADD(segvnvmstats.demoterange[0]); err = segvn_demote_range(seg, addr, len, SDR_END); if (err == 0) { return (IE_RETRY); } return (err); } } /* Inform the vnode of the unmapping. */ if (svd->vp) { int error; error = VOP_DELMAP(svd->vp, (offset_t)svd->offset + (uintptr_t)(addr - seg->s_base), seg->s_as, addr, len, svd->prot, svd->maxprot, svd->type, svd->cred); if (error == EAGAIN) return (error); } /* * Remove any page locks set through this mapping. */ (void) segvn_lockop(seg, addr, len, 0, MC_UNLOCK, NULL, 0); /* * Unload any hardware translations in the range to be taken out. * Use a callback to invoke free_vp_pages() effectively. */ if (svd->vp != NULL && free_pages != 0) { callback.hcb_data = seg; callback.hcb_function = segvn_hat_unload_callback; cbp = &callback; } hat_unload_callback(seg->s_as->a_hat, addr, len, HAT_UNLOAD_UNMAP, cbp); /* * Check for entire segment */ if (addr == seg->s_base && len == seg->s_size) { seg_free(seg); return (0); } opages = seg_pages(seg); dpages = btop(len); npages = opages - dpages; amp = svd->amp; /* * Check for beginning of segment */ if (addr == seg->s_base) { if (svd->vpage != NULL) { size_t nbytes; struct vpage *ovpage; ovpage = svd->vpage; /* keep pointer to vpage */ nbytes = vpgtob(npages); svd->vpage = kmem_alloc(nbytes, KM_SLEEP); bcopy(&ovpage[dpages], svd->vpage, nbytes); /* free up old vpage */ kmem_free(ovpage, vpgtob(opages)); } if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); if (amp->refcnt == 1 || svd->type == MAP_PRIVATE) { /* * Free up now unused parts of anon_map array. */ if (seg->s_szc != 0) { anon_free_pages(amp->ahp, svd->anon_index, len, seg->s_szc); } else { anon_free(amp->ahp, svd->anon_index, len); } /* * Unreserve swap space for the unmapped chunk * of this segment in case it's MAP_SHARED */ if (svd->type == MAP_SHARED) { anon_unresv(len); amp->swresv -= len; } } ANON_LOCK_EXIT(&->a_rwlock); svd->anon_index += dpages; } if (svd->vp != NULL) svd->offset += len; if (svd->swresv) { if (svd->flags & MAP_NORESERVE) { ASSERT(amp); oswresv = svd->swresv; svd->swresv = ptob(anon_pages(amp->ahp, svd->anon_index, npages)); anon_unresv(oswresv - svd->swresv); } else { anon_unresv(len); svd->swresv -= len; } TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, len, 0); } seg->s_base += len; seg->s_size -= len; return (0); } /* * Check for end of segment */ if (addr + len == seg->s_base + seg->s_size) { if (svd->vpage != NULL) { size_t nbytes; struct vpage *ovpage; ovpage = svd->vpage; /* keep pointer to vpage */ nbytes = vpgtob(npages); svd->vpage = kmem_alloc(nbytes, KM_SLEEP); bcopy(ovpage, svd->vpage, nbytes); /* free up old vpage */ kmem_free(ovpage, vpgtob(opages)); } if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); if (amp->refcnt == 1 || svd->type == MAP_PRIVATE) { /* * Free up now unused parts of anon_map array */ if (seg->s_szc != 0) { ulong_t an_idx = svd->anon_index + npages; anon_free_pages(amp->ahp, an_idx, len, seg->s_szc); } else { anon_free(amp->ahp, svd->anon_index + npages, len); } /* * Unreserve swap space for the unmapped chunk * of this segment in case it's MAP_SHARED */ if (svd->type == MAP_SHARED) { anon_unresv(len); amp->swresv -= len; } } ANON_LOCK_EXIT(&->a_rwlock); } if (svd->swresv) { if (svd->flags & MAP_NORESERVE) { ASSERT(amp); oswresv = svd->swresv; svd->swresv = ptob(anon_pages(amp->ahp, svd->anon_index, npages)); anon_unresv(oswresv - svd->swresv); } else { anon_unresv(len); svd->swresv -= len; } TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, len, 0); } seg->s_size -= len; return (0); } /* * The section to go is in the middle of the segment, * have to make it into two segments. nseg is made for * the high end while seg is cut down at the low end. */ nbase = addr + len; /* new seg base */ nsize = (seg->s_base + seg->s_size) - nbase; /* new seg size */ seg->s_size = addr - seg->s_base; /* shrink old seg */ nseg = seg_alloc(seg->s_as, nbase, nsize); if (nseg == NULL) { panic("segvn_unmap seg_alloc"); /*NOTREACHED*/ } nseg->s_ops = seg->s_ops; nsvd = kmem_cache_alloc(segvn_cache, KM_SLEEP); nseg->s_data = (void *)nsvd; nseg->s_szc = seg->s_szc; *nsvd = *svd; nsvd->offset = svd->offset + (uintptr_t)(nseg->s_base - seg->s_base); nsvd->swresv = 0; nsvd->softlockcnt = 0; if (svd->vp != NULL) { VN_HOLD(nsvd->vp); if (nsvd->type == MAP_SHARED) lgrp_shm_policy_init(NULL, nsvd->vp); } crhold(svd->cred); if (svd->vpage == NULL) { nsvd->vpage = NULL; } else { /* need to split vpage into two arrays */ size_t nbytes; struct vpage *ovpage; ovpage = svd->vpage; /* keep pointer to vpage */ npages = seg_pages(seg); /* seg has shrunk */ nbytes = vpgtob(npages); svd->vpage = kmem_alloc(nbytes, KM_SLEEP); bcopy(ovpage, svd->vpage, nbytes); npages = seg_pages(nseg); nbytes = vpgtob(npages); nsvd->vpage = kmem_alloc(nbytes, KM_SLEEP); bcopy(&ovpage[opages - npages], nsvd->vpage, nbytes); /* free up old vpage */ kmem_free(ovpage, vpgtob(opages)); } if (amp == NULL) { nsvd->amp = NULL; nsvd->anon_index = 0; } else { /* * Need to create a new anon map for the new segment. * We'll also allocate a new smaller array for the old * smaller segment to save space. */ opages = btop((uintptr_t)(addr - seg->s_base)); ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); if (amp->refcnt == 1 || svd->type == MAP_PRIVATE) { /* * Free up now unused parts of anon_map array */ if (seg->s_szc != 0) { ulong_t an_idx = svd->anon_index + opages; anon_free_pages(amp->ahp, an_idx, len, seg->s_szc); } else { anon_free(amp->ahp, svd->anon_index + opages, len); } /* * Unreserve swap space for the unmapped chunk * of this segment in case it's MAP_SHARED */ if (svd->type == MAP_SHARED) { anon_unresv(len); amp->swresv -= len; } } nsvd->anon_index = svd->anon_index + btop((uintptr_t)(nseg->s_base - seg->s_base)); if (svd->type == MAP_SHARED) { ASSERT(seg->s_szc == 0); amp->refcnt++; nsvd->amp = amp; } else { struct anon_map *namp; struct anon_hdr *nahp; ASSERT(svd->type == MAP_PRIVATE); nahp = anon_create(btop(seg->s_size), ANON_SLEEP); namp = anonmap_alloc(nseg->s_size, 0); namp->a_szc = seg->s_szc; (void) anon_copy_ptr(amp->ahp, svd->anon_index, nahp, 0, btop(seg->s_size), ANON_SLEEP); (void) anon_copy_ptr(amp->ahp, nsvd->anon_index, namp->ahp, 0, btop(nseg->s_size), ANON_SLEEP); anon_release(amp->ahp, btop(amp->size)); svd->anon_index = 0; nsvd->anon_index = 0; amp->ahp = nahp; amp->size = seg->s_size; nsvd->amp = namp; } ANON_LOCK_EXIT(&->a_rwlock); } if (svd->swresv) { if (svd->flags & MAP_NORESERVE) { ASSERT(amp); oswresv = svd->swresv; svd->swresv = ptob(anon_pages(amp->ahp, svd->anon_index, btop(seg->s_size))); nsvd->swresv = ptob(anon_pages(nsvd->amp->ahp, nsvd->anon_index, btop(nseg->s_size))); ASSERT(oswresv >= (svd->swresv + nsvd->swresv)); anon_unresv(oswresv - (svd->swresv + nsvd->swresv)); } else { if (seg->s_size + nseg->s_size + len != svd->swresv) { panic("segvn_unmap: " "cannot split swap reservation"); /*NOTREACHED*/ } anon_unresv(len); svd->swresv = seg->s_size; nsvd->swresv = nseg->s_size; } TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, len, 0); } return (0); /* I'm glad that's all over with! */ } static void segvn_free(struct seg *seg) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; pgcnt_t npages = seg_pages(seg); struct anon_map *amp; size_t len; /* * We don't need any segment level locks for "segvn" data * since the address space is "write" locked. */ ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); /* * Be sure to unlock pages. XXX Why do things get free'ed instead * of unmapped? XXX */ (void) segvn_lockop(seg, seg->s_base, seg->s_size, 0, MC_UNLOCK, NULL, 0); /* * Deallocate the vpage and anon pointers if necessary and possible. */ if (svd->vpage != NULL) { kmem_free(svd->vpage, vpgtob(npages)); svd->vpage = NULL; } if ((amp = svd->amp) != NULL) { /* * If there are no more references to this anon_map * structure, then deallocate the structure after freeing * up all the anon slot pointers that we can. */ ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); if (--amp->refcnt == 0) { if (svd->type == MAP_PRIVATE) { /* * Private - we only need to anon_free * the part that this segment refers to. */ if (seg->s_szc != 0) { anon_free_pages(amp->ahp, svd->anon_index, seg->s_size, seg->s_szc); } else { anon_free(amp->ahp, svd->anon_index, seg->s_size); } } else { /* * Shared - anon_free the entire * anon_map's worth of stuff and * release any swap reservation. */ ASSERT(seg->s_szc == 0); anon_free(amp->ahp, 0, amp->size); if ((len = amp->swresv) != 0) { anon_unresv(len); TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, len, 0); } } svd->amp = NULL; ANON_LOCK_EXIT(&->a_rwlock); anonmap_free(amp); } else if (svd->type == MAP_PRIVATE) { /* * We had a private mapping which still has * a held anon_map so just free up all the * anon slot pointers that we were using. */ if (seg->s_szc != 0) { anon_free_pages(amp->ahp, svd->anon_index, seg->s_size, seg->s_szc); } else { anon_free(amp->ahp, svd->anon_index, seg->s_size); } ANON_LOCK_EXIT(&->a_rwlock); } else { ANON_LOCK_EXIT(&->a_rwlock); } } /* * Release swap reservation. */ if ((len = svd->swresv) != 0) { anon_unresv(svd->swresv); TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, len, 0); svd->swresv = 0; } /* * Release claim on vnode, credentials, and finally free the * private data. */ if (svd->vp != NULL) { if (svd->type == MAP_SHARED) lgrp_shm_policy_fini(NULL, svd->vp); VN_RELE(svd->vp); svd->vp = NULL; } crfree(svd->cred); svd->cred = NULL; seg->s_data = NULL; kmem_cache_free(segvn_cache, svd); } /* * Do a F_SOFTUNLOCK call over the range requested. The range must have * already been F_SOFTLOCK'ed. * Caller must always match addr and len of a softunlock with a previous * softlock with exactly the same addr and len. */ static void segvn_softunlock(struct seg *seg, caddr_t addr, size_t len, enum seg_rw rw) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; page_t *pp; caddr_t adr; struct vnode *vp; u_offset_t offset; ulong_t anon_index; struct anon_map *amp; struct anon *ap = NULL; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock)); if ((amp = svd->amp) != NULL) anon_index = svd->anon_index + seg_page(seg, addr); hat_unlock(seg->s_as->a_hat, addr, len); for (adr = addr; adr < addr + len; adr += PAGESIZE) { if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_READER); if ((ap = anon_get_ptr(amp->ahp, anon_index++)) != NULL) { swap_xlate(ap, &vp, &offset); } else { vp = svd->vp; offset = svd->offset + (uintptr_t)(adr - seg->s_base); } ANON_LOCK_EXIT(&->a_rwlock); } else { vp = svd->vp; offset = svd->offset + (uintptr_t)(adr - seg->s_base); } /* * Use page_find() instead of page_lookup() to * find the page since we know that it is locked. */ pp = page_find(vp, offset); if (pp == NULL) { panic( "segvn_softunlock: addr %p, ap %p, vp %p, off %llx", (void *)adr, (void *)ap, (void *)vp, offset); /*NOTREACHED*/ } if (rw == S_WRITE) { hat_setrefmod(pp); if (seg->s_as->a_vbits) hat_setstat(seg->s_as, adr, PAGESIZE, P_REF | P_MOD); } else if (rw != S_OTHER) { hat_setref(pp); if (seg->s_as->a_vbits) hat_setstat(seg->s_as, adr, PAGESIZE, P_REF); } TRACE_3(TR_FAC_VM, TR_SEGVN_FAULT, "segvn_fault:pp %p vp %p offset %llx", pp, vp, offset); page_unlock(pp); } mutex_enter(&freemem_lock); /* for availrmem */ availrmem += btop(len); segvn_pages_locked -= btop(len); svd->softlockcnt -= btop(len); mutex_exit(&freemem_lock); if (svd->softlockcnt == 0) { /* * All SOFTLOCKS are gone. Wakeup any waiting * unmappers so they can try again to unmap. * Check for waiters first without the mutex * held so we don't always grab the mutex on * softunlocks. */ if (AS_ISUNMAPWAIT(seg->s_as)) { mutex_enter(&seg->s_as->a_contents); if (AS_ISUNMAPWAIT(seg->s_as)) { AS_CLRUNMAPWAIT(seg->s_as); cv_broadcast(&seg->s_as->a_cv); } mutex_exit(&seg->s_as->a_contents); } } } #define PAGE_HANDLED ((page_t *)-1) /* * Release all the pages in the NULL terminated ppp list * which haven't already been converted to PAGE_HANDLED. */ static void segvn_pagelist_rele(page_t **ppp) { for (; *ppp != NULL; ppp++) { if (*ppp != PAGE_HANDLED) page_unlock(*ppp); } } static int stealcow = 1; /* * Workaround for viking chip bug. See bug id 1220902. * To fix this down in pagefault() would require importing so * much as and segvn code as to be unmaintainable. */ int enable_mbit_wa = 0; /* * Handles all the dirty work of getting the right * anonymous pages and loading up the translations. * This routine is called only from segvn_fault() * when looping over the range of addresses requested. * * The basic algorithm here is: * If this is an anon_zero case * Call anon_zero to allocate page * Load up translation * Return * endif * If this is an anon page * Use anon_getpage to get the page * else * Find page in pl[] list passed in * endif * If not a cow * Load up the translation to the page * return * endif * Call anon_private to handle cow * Load up (writable) translation to new page */ static faultcode_t segvn_faultpage( struct hat *hat, /* the hat to use for mapping */ struct seg *seg, /* seg_vn of interest */ caddr_t addr, /* address in as */ u_offset_t off, /* offset in vp */ struct vpage *vpage, /* pointer to vpage for vp, off */ page_t *pl[], /* object source page pointer */ uint_t vpprot, /* access allowed to object pages */ enum fault_type type, /* type of fault */ enum seg_rw rw, /* type of access at fault */ int brkcow) /* we may need to break cow */ { struct segvn_data *svd = (struct segvn_data *)seg->s_data; page_t *pp, **ppp; uint_t pageflags = 0; page_t *anon_pl[1 + 1]; page_t *opp = NULL; /* original page */ uint_t prot; int err; int cow; int claim; int steal = 0; ulong_t anon_index; struct anon *ap, *oldap; struct anon_map *amp; int hat_flag = (type == F_SOFTLOCK) ? HAT_LOAD_LOCK : HAT_LOAD; int anon_lock = 0; anon_sync_obj_t cookie; if (svd->flags & MAP_TEXT) { hat_flag |= HAT_LOAD_TEXT; } ASSERT(SEGVN_READ_HELD(seg->s_as, &svd->lock)); ASSERT(seg->s_szc == 0); /* * Initialize protection value for this page. * If we have per page protection values check it now. */ if (svd->pageprot) { uint_t protchk; switch (rw) { case S_READ: protchk = PROT_READ; break; case S_WRITE: protchk = PROT_WRITE; break; case S_EXEC: protchk = PROT_EXEC; break; case S_OTHER: default: protchk = PROT_READ | PROT_WRITE | PROT_EXEC; break; } prot = VPP_PROT(vpage); if ((prot & protchk) == 0) return (FC_PROT); /* illegal access type */ } else { prot = svd->prot; } if (type == F_SOFTLOCK) { mutex_enter(&freemem_lock); if (availrmem <= tune.t_minarmem) { mutex_exit(&freemem_lock); return (FC_MAKE_ERR(ENOMEM)); /* out of real memory */ } else { svd->softlockcnt++; availrmem--; segvn_pages_locked++; } mutex_exit(&freemem_lock); } /* * Always acquire the anon array lock to prevent 2 threads from * allocating separate anon slots for the same "addr". */ if ((amp = svd->amp) != NULL) { ASSERT(RW_READ_HELD(&->a_rwlock)); anon_index = svd->anon_index + seg_page(seg, addr); anon_array_enter(amp, anon_index, &cookie); anon_lock = 1; } if (svd->vp == NULL && amp != NULL) { if ((ap = anon_get_ptr(amp->ahp, anon_index)) == NULL) { /* * Allocate a (normally) writable anonymous page of * zeroes. If no advance reservations, reserve now. */ if (svd->flags & MAP_NORESERVE) { if (anon_resv(ptob(1))) { svd->swresv += ptob(1); } else { err = ENOMEM; goto out; } } if ((pp = anon_zero(seg, addr, &ap, svd->cred)) == NULL) { err = ENOMEM; goto out; /* out of swap space */ } /* * Re-acquire the anon_map lock and * initialize the anon array entry. */ (void) anon_set_ptr(amp->ahp, anon_index, ap, ANON_SLEEP); if (enable_mbit_wa) { if (rw == S_WRITE) hat_setmod(pp); else if (!hat_ismod(pp)) prot &= ~PROT_WRITE; } /* * If AS_PAGLCK is set in a_flags (via memcntl(2) * with MC_LOCKAS, MCL_FUTURE) and this is a * MAP_NORESERVE segment, we may need to * permanently lock the page as it is being faulted * for the first time. The following text applies * only to MAP_NORESERVE segments: * * As per memcntl(2), if this segment was created * after MCL_FUTURE was applied (a "future" * segment), its pages must be locked. If this * segment existed at MCL_FUTURE application (a * "past" segment), the interface is unclear. * * We decide to lock only if vpage is present: * * - "future" segments will have a vpage array (see * as_map), and so will be locked as required * * - "past" segments may not have a vpage array, * depending on whether events (such as * mprotect) have occurred. Locking if vpage * exists will preserve legacy behavior. Not * locking if vpage is absent, will not break * the interface or legacy behavior. Note that * allocating vpage here if it's absent requires * upgrading the segvn reader lock, the cost of * which does not seem worthwhile. */ if (AS_ISPGLCK(seg->s_as) && vpage != NULL && (svd->flags & MAP_NORESERVE)) { claim = VPP_PROT(vpage) & PROT_WRITE; ASSERT(svd->type == MAP_PRIVATE); if (page_pp_lock(pp, claim, 0)) VPP_SETPPLOCK(vpage); } /* * Handle pages that have been marked for migration */ if (lgrp_optimizations()) page_migrate(seg, addr, &pp, 1); hat_memload(hat, addr, pp, prot, hat_flag); if (!(hat_flag & HAT_LOAD_LOCK)) page_unlock(pp); anon_array_exit(&cookie); return (0); } } /* * Obtain the page structure via anon_getpage() if it is * a private copy of an object (the result of a previous * copy-on-write). */ if (amp != NULL) { if ((ap = anon_get_ptr(amp->ahp, anon_index)) != NULL) { err = anon_getpage(&ap, &vpprot, anon_pl, PAGESIZE, seg, addr, rw, svd->cred); if (err) goto out; if (svd->type == MAP_SHARED) { /* * If this is a shared mapping to an * anon_map, then ignore the write * permissions returned by anon_getpage(). * They apply to the private mappings * of this anon_map. */ vpprot |= PROT_WRITE; } opp = anon_pl[0]; } } /* * Search the pl[] list passed in if it is from the * original object (i.e., not a private copy). */ if (opp == NULL) { /* * Find original page. We must be bringing it in * from the list in pl[]. */ for (ppp = pl; (opp = *ppp) != NULL; ppp++) { if (opp == PAGE_HANDLED) continue; ASSERT(opp->p_vnode == svd->vp); /* XXX */ if (opp->p_offset == off) break; } if (opp == NULL) { panic("segvn_faultpage not found"); /*NOTREACHED*/ } *ppp = PAGE_HANDLED; } ASSERT(PAGE_LOCKED(opp)); TRACE_3(TR_FAC_VM, TR_SEGVN_FAULT, "segvn_fault:pp %p vp %p offset %llx", opp, NULL, 0); /* * The fault is treated as a copy-on-write fault if a * write occurs on a private segment and the object * page (i.e., mapping) is write protected. We assume * that fatal protection checks have already been made. */ cow = brkcow && ((vpprot & PROT_WRITE) == 0); /* * If not a copy-on-write case load the translation * and return. */ if (cow == 0) { if (IS_VMODSORT(opp->p_vnode) || enable_mbit_wa) { if (rw == S_WRITE) hat_setmod(opp); else if (rw != S_OTHER && !hat_ismod(opp)) prot &= ~PROT_WRITE; } /* * Handle pages that have been marked for migration */ if (lgrp_optimizations()) page_migrate(seg, addr, &opp, 1); hat_memload(hat, addr, opp, prot & vpprot, hat_flag); if (!(hat_flag & HAT_LOAD_LOCK)) page_unlock(opp); if (anon_lock) { anon_array_exit(&cookie); } return (0); } hat_setref(opp); ASSERT(amp != NULL && anon_lock); /* * Steal the page only if it isn't a private page * since stealing a private page is not worth the effort. */ if ((ap = anon_get_ptr(amp->ahp, anon_index)) == NULL) steal = 1; /* * Steal the original page if the following conditions are true: * * We are low on memory, the page is not private, page is not large, * not shared, not modified, not `locked' or if we have it `locked' * (i.e., p_cowcnt == 1 and p_lckcnt == 0, which also implies * that the page is not shared) and if it doesn't have any * translations. page_struct_lock isn't needed to look at p_cowcnt * and p_lckcnt because we first get exclusive lock on page. */ (void) hat_pagesync(opp, HAT_SYNC_DONTZERO | HAT_SYNC_STOPON_MOD); if (stealcow && freemem < minfree && steal && opp->p_szc == 0 && page_tryupgrade(opp) && !hat_ismod(opp) && ((opp->p_lckcnt == 0 && opp->p_cowcnt == 0) || (opp->p_lckcnt == 0 && opp->p_cowcnt == 1 && vpage != NULL && VPP_ISPPLOCK(vpage)))) { /* * Check if this page has other translations * after unloading our translation. */ if (hat_page_is_mapped(opp)) { hat_unload(seg->s_as->a_hat, addr, PAGESIZE, HAT_UNLOAD); } /* * hat_unload() might sync back someone else's recent * modification, so check again. */ if (!hat_ismod(opp) && !hat_page_is_mapped(opp)) pageflags |= STEAL_PAGE; } /* * If we have a vpage pointer, see if it indicates that we have * ``locked'' the page we map -- if so, tell anon_private to * transfer the locking resource to the new page. * * See Statement at the beginning of segvn_lockop regarding * the way lockcnts/cowcnts are handled during COW. * */ if (vpage != NULL && VPP_ISPPLOCK(vpage)) pageflags |= LOCK_PAGE; /* * Allocate a private page and perform the copy. * For MAP_NORESERVE reserve swap space now, unless this * is a cow fault on an existing anon page in which case * MAP_NORESERVE will have made advance reservations. */ if ((svd->flags & MAP_NORESERVE) && (ap == NULL)) { if (anon_resv(ptob(1))) { svd->swresv += ptob(1); } else { page_unlock(opp); err = ENOMEM; goto out; } } oldap = ap; pp = anon_private(&ap, seg, addr, prot, opp, pageflags, svd->cred); if (pp == NULL) { err = ENOMEM; /* out of swap space */ goto out; } /* * If we copied away from an anonymous page, then * we are one step closer to freeing up an anon slot. * * NOTE: The original anon slot must be released while * holding the "anon_map" lock. This is necessary to prevent * other threads from obtaining a pointer to the anon slot * which may be freed if its "refcnt" is 1. */ if (oldap != NULL) anon_decref(oldap); (void) anon_set_ptr(amp->ahp, anon_index, ap, ANON_SLEEP); ASSERT(!IS_VMODSORT(pp->p_vnode)); if (enable_mbit_wa) { if (rw == S_WRITE) hat_setmod(pp); else if (!hat_ismod(pp)) prot &= ~PROT_WRITE; } /* * Handle pages that have been marked for migration */ if (lgrp_optimizations()) page_migrate(seg, addr, &pp, 1); hat_memload(hat, addr, pp, prot, hat_flag); if (!(hat_flag & HAT_LOAD_LOCK)) page_unlock(pp); ASSERT(anon_lock); anon_array_exit(&cookie); return (0); out: if (anon_lock) anon_array_exit(&cookie); if (type == F_SOFTLOCK) { mutex_enter(&freemem_lock); availrmem++; segvn_pages_locked--; svd->softlockcnt--; mutex_exit(&freemem_lock); } return (FC_MAKE_ERR(err)); } /* * relocate a bunch of smaller targ pages into one large repl page. all targ * pages must be complete pages smaller than replacement pages. * it's assumed that no page's szc can change since they are all PAGESIZE or * complete large pages locked SHARED. */ static void segvn_relocate_pages(page_t **targ, page_t *replacement) { page_t *pp; pgcnt_t repl_npgs, curnpgs; pgcnt_t i; uint_t repl_szc = replacement->p_szc; page_t *first_repl = replacement; page_t *repl; spgcnt_t npgs; VM_STAT_ADD(segvnvmstats.relocatepages[0]); ASSERT(repl_szc != 0); npgs = repl_npgs = page_get_pagecnt(repl_szc); i = 0; while (repl_npgs) { spgcnt_t nreloc; int err; ASSERT(replacement != NULL); pp = targ[i]; ASSERT(pp->p_szc < repl_szc); ASSERT(PAGE_EXCL(pp)); ASSERT(!PP_ISFREE(pp)); curnpgs = page_get_pagecnt(pp->p_szc); if (curnpgs == 1) { VM_STAT_ADD(segvnvmstats.relocatepages[1]); repl = replacement; page_sub(&replacement, repl); ASSERT(PAGE_EXCL(repl)); ASSERT(!PP_ISFREE(repl)); ASSERT(repl->p_szc == repl_szc); } else { page_t *repl_savepp; int j; VM_STAT_ADD(segvnvmstats.relocatepages[2]); repl_savepp = replacement; for (j = 0; j < curnpgs; j++) { repl = replacement; page_sub(&replacement, repl); ASSERT(PAGE_EXCL(repl)); ASSERT(!PP_ISFREE(repl)); ASSERT(repl->p_szc == repl_szc); ASSERT(page_pptonum(targ[i + j]) == page_pptonum(targ[i]) + j); } repl = repl_savepp; ASSERT(IS_P2ALIGNED(page_pptonum(repl), curnpgs)); } err = page_relocate(&pp, &repl, 0, 1, &nreloc, NULL); if (err || nreloc != curnpgs) { panic("segvn_relocate_pages: " "page_relocate failed err=%d curnpgs=%ld " "nreloc=%ld", err, curnpgs, nreloc); } ASSERT(curnpgs <= repl_npgs); repl_npgs -= curnpgs; i += curnpgs; } ASSERT(replacement == NULL); repl = first_repl; repl_npgs = npgs; for (i = 0; i < repl_npgs; i++) { ASSERT(PAGE_EXCL(repl)); ASSERT(!PP_ISFREE(repl)); targ[i] = repl; page_downgrade(targ[i]); repl++; } } /* * Check if all pages in ppa array are complete smaller than szc pages and * their roots will still be aligned relative to their current size if the * entire ppa array is relocated into one szc page. If these conditions are * not met return 0. * * If all pages are properly aligned attempt to upgrade their locks * to exclusive mode. If it fails set *upgrdfail to 1 and return 0. * upgrdfail was set to 0 by caller. * * Return 1 if all pages are aligned and locked exclusively. * * If all pages in ppa array happen to be physically contiguous to make one * szc page and all exclusive locks are successfully obtained promote the page * size to szc and set *pszc to szc. Return 1 with pages locked shared. */ static int segvn_full_szcpages(page_t **ppa, uint_t szc, int *upgrdfail, uint_t *pszc) { page_t *pp; pfn_t pfn; pgcnt_t totnpgs = page_get_pagecnt(szc); pfn_t first_pfn; int contig = 1; pgcnt_t i; pgcnt_t j; uint_t curszc; pgcnt_t curnpgs; int root = 0; ASSERT(szc > 0); VM_STAT_ADD(segvnvmstats.fullszcpages[0]); for (i = 0; i < totnpgs; i++) { pp = ppa[i]; ASSERT(PAGE_SHARED(pp)); ASSERT(!PP_ISFREE(pp)); pfn = page_pptonum(pp); if (i == 0) { if (!IS_P2ALIGNED(pfn, totnpgs)) { contig = 0; } else { first_pfn = pfn; } } else if (contig && pfn != first_pfn + i) { contig = 0; } if (pp->p_szc == 0) { if (root) { VM_STAT_ADD(segvnvmstats.fullszcpages[1]); return (0); } } else if (!root) { if ((curszc = pp->p_szc) >= szc) { VM_STAT_ADD(segvnvmstats.fullszcpages[2]); return (0); } if (curszc == 0) { /* * p_szc changed means we don't have all pages * locked. return failure. */ VM_STAT_ADD(segvnvmstats.fullszcpages[3]); return (0); } curnpgs = page_get_pagecnt(curszc); if (!IS_P2ALIGNED(pfn, curnpgs) || !IS_P2ALIGNED(i, curnpgs)) { VM_STAT_ADD(segvnvmstats.fullszcpages[4]); return (0); } root = 1; } else { ASSERT(i > 0); VM_STAT_ADD(segvnvmstats.fullszcpages[5]); if (pp->p_szc != curszc) { VM_STAT_ADD(segvnvmstats.fullszcpages[6]); return (0); } if (pfn - 1 != page_pptonum(ppa[i - 1])) { panic("segvn_full_szcpages: " "large page not physically contiguous"); } if (P2PHASE(pfn, curnpgs) == curnpgs - 1) { root = 0; } } } for (i = 0; i < totnpgs; i++) { ASSERT(ppa[i]->p_szc < szc); if (!page_tryupgrade(ppa[i])) { for (j = 0; j < i; j++) { page_downgrade(ppa[j]); } *pszc = ppa[i]->p_szc; *upgrdfail = 1; VM_STAT_ADD(segvnvmstats.fullszcpages[7]); return (0); } } /* * When a page is put a free cachelist its szc is set to 0. if file * system reclaimed pages from cachelist targ pages will be physically * contiguous with 0 p_szc. in this case just upgrade szc of targ * pages without any relocations. * To avoid any hat issues with previous small mappings * hat_pageunload() the target pages first. */ if (contig) { VM_STAT_ADD(segvnvmstats.fullszcpages[8]); for (i = 0; i < totnpgs; i++) { (void) hat_pageunload(ppa[i], HAT_FORCE_PGUNLOAD); } for (i = 0; i < totnpgs; i++) { ppa[i]->p_szc = szc; } for (i = 0; i < totnpgs; i++) { ASSERT(PAGE_EXCL(ppa[i])); page_downgrade(ppa[i]); } if (pszc != NULL) { *pszc = szc; } } VM_STAT_ADD(segvnvmstats.fullszcpages[9]); return (1); } /* * Create physically contiguous pages for [vp, off] - [vp, off + * page_size(szc)) range and for private segment return them in ppa array. * Pages are created either via IO or relocations. * * Return 1 on sucess and 0 on failure. * * If physically contiguos pages already exist for this range return 1 without * filling ppa array. Caller initializes ppa[0] as NULL to detect that ppa * array wasn't filled. In this case caller fills ppa array via VOP_GETPAGE(). */ static int segvn_fill_vp_pages(struct segvn_data *svd, vnode_t *vp, u_offset_t off, uint_t szc, page_t **ppa, page_t **ppplist, uint_t *ret_pszc, int *downsize) { page_t *pplist = *ppplist; size_t pgsz = page_get_pagesize(szc); pgcnt_t pages = btop(pgsz); ulong_t start_off = off; u_offset_t eoff = off + pgsz; spgcnt_t nreloc; u_offset_t io_off = off; size_t io_len; page_t *io_pplist = NULL; page_t *done_pplist = NULL; pgcnt_t pgidx = 0; page_t *pp; page_t *newpp; page_t *targpp; int io_err = 0; int i; pfn_t pfn; ulong_t ppages; page_t *targ_pplist = NULL; page_t *repl_pplist = NULL; page_t *tmp_pplist; int nios = 0; uint_t pszc; struct vattr va; VM_STAT_ADD(segvnvmstats.fill_vp_pages[0]); ASSERT(szc != 0); ASSERT(pplist->p_szc == szc); /* * downsize will be set to 1 only if we fail to lock pages. this will * allow subsequent faults to try to relocate the page again. If we * fail due to misalignment don't downsize and let the caller map the * whole region with small mappings to avoid more faults into the area * where we can't get large pages anyway. */ *downsize = 0; while (off < eoff) { newpp = pplist; ASSERT(newpp != NULL); ASSERT(PAGE_EXCL(newpp)); ASSERT(!PP_ISFREE(newpp)); /* * we pass NULL for nrelocp to page_lookup_create() * so that it doesn't relocate. We relocate here * later only after we make sure we can lock all * pages in the range we handle and they are all * aligned. */ pp = page_lookup_create(vp, off, SE_SHARED, newpp, NULL, 0); ASSERT(pp != NULL); ASSERT(!PP_ISFREE(pp)); ASSERT(pp->p_vnode == vp); ASSERT(pp->p_offset == off); if (pp == newpp) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[1]); page_sub(&pplist, pp); ASSERT(PAGE_EXCL(pp)); ASSERT(page_iolock_assert(pp)); page_list_concat(&io_pplist, &pp); off += PAGESIZE; continue; } VM_STAT_ADD(segvnvmstats.fill_vp_pages[2]); pfn = page_pptonum(pp); pszc = pp->p_szc; if (pszc >= szc && targ_pplist == NULL && io_pplist == NULL && IS_P2ALIGNED(pfn, pages)) { ASSERT(repl_pplist == NULL); ASSERT(done_pplist == NULL); ASSERT(pplist == *ppplist); page_unlock(pp); page_free_replacement_page(pplist); page_create_putback(pages); *ppplist = NULL; VM_STAT_ADD(segvnvmstats.fill_vp_pages[3]); return (1); } if (pszc >= szc) { page_unlock(pp); segvn_faultvnmpss_align_err1++; goto out; } ppages = page_get_pagecnt(pszc); if (!IS_P2ALIGNED(pfn, ppages)) { ASSERT(pszc > 0); /* * sizing down to pszc won't help. */ page_unlock(pp); segvn_faultvnmpss_align_err2++; goto out; } pfn = page_pptonum(newpp); if (!IS_P2ALIGNED(pfn, ppages)) { ASSERT(pszc > 0); /* * sizing down to pszc won't help. */ page_unlock(pp); segvn_faultvnmpss_align_err3++; goto out; } if (!PAGE_EXCL(pp)) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[4]); page_unlock(pp); *downsize = 1; *ret_pszc = pp->p_szc; goto out; } targpp = pp; if (io_pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[5]); io_len = off - io_off; /* * Some file systems like NFS don't check EOF * conditions in VOP_PAGEIO(). Check it here * now that pages are locked SE_EXCL. Any file * truncation will wait until the pages are * unlocked so no need to worry that file will * be truncated after we check its size here. * XXX fix NFS to remove this check. */ va.va_mask = AT_SIZE; if (VOP_GETATTR(vp, &va, ATTR_HINT, svd->cred) != 0) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[6]); page_unlock(targpp); goto out; } if (btopr(va.va_size) < btopr(io_off + io_len)) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[7]); *downsize = 1; *ret_pszc = 0; page_unlock(targpp); goto out; } io_err = VOP_PAGEIO(vp, io_pplist, io_off, io_len, B_READ, svd->cred); if (io_err) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[8]); page_unlock(targpp); if (io_err == EDEADLK) { segvn_vmpss_pageio_deadlk_err++; } goto out; } nios++; VM_STAT_ADD(segvnvmstats.fill_vp_pages[9]); while (io_pplist != NULL) { pp = io_pplist; page_sub(&io_pplist, pp); ASSERT(page_iolock_assert(pp)); page_io_unlock(pp); pgidx = (pp->p_offset - start_off) >> PAGESHIFT; ASSERT(pgidx < pages); ppa[pgidx] = pp; page_list_concat(&done_pplist, &pp); } } pp = targpp; ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_szc <= pszc); if (pszc != 0 && !group_page_trylock(pp, SE_EXCL)) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[10]); page_unlock(pp); *downsize = 1; *ret_pszc = pp->p_szc; goto out; } VM_STAT_ADD(segvnvmstats.fill_vp_pages[11]); /* * page szc chould have changed before the entire group was * locked. reread page szc. */ pszc = pp->p_szc; ppages = page_get_pagecnt(pszc); /* link just the roots */ page_list_concat(&targ_pplist, &pp); page_sub(&pplist, newpp); page_list_concat(&repl_pplist, &newpp); off += PAGESIZE; while (--ppages != 0) { newpp = pplist; page_sub(&pplist, newpp); off += PAGESIZE; } io_off = off; } if (io_pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[12]); io_len = eoff - io_off; va.va_mask = AT_SIZE; if (VOP_GETATTR(vp, &va, ATTR_HINT, svd->cred) != 0) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[13]); goto out; } if (btopr(va.va_size) < btopr(io_off + io_len)) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[14]); *downsize = 1; *ret_pszc = 0; goto out; } io_err = VOP_PAGEIO(vp, io_pplist, io_off, io_len, B_READ, svd->cred); if (io_err) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[15]); if (io_err == EDEADLK) { segvn_vmpss_pageio_deadlk_err++; } goto out; } nios++; while (io_pplist != NULL) { pp = io_pplist; page_sub(&io_pplist, pp); ASSERT(page_iolock_assert(pp)); page_io_unlock(pp); pgidx = (pp->p_offset - start_off) >> PAGESHIFT; ASSERT(pgidx < pages); ppa[pgidx] = pp; } } /* * we're now bound to succeed or panic. * remove pages from done_pplist. it's not needed anymore. */ while (done_pplist != NULL) { pp = done_pplist; page_sub(&done_pplist, pp); } VM_STAT_ADD(segvnvmstats.fill_vp_pages[16]); ASSERT(pplist == NULL); *ppplist = NULL; while (targ_pplist != NULL) { int ret; VM_STAT_ADD(segvnvmstats.fill_vp_pages[17]); ASSERT(repl_pplist); pp = targ_pplist; page_sub(&targ_pplist, pp); pgidx = (pp->p_offset - start_off) >> PAGESHIFT; newpp = repl_pplist; page_sub(&repl_pplist, newpp); #ifdef DEBUG pfn = page_pptonum(pp); pszc = pp->p_szc; ppages = page_get_pagecnt(pszc); ASSERT(IS_P2ALIGNED(pfn, ppages)); pfn = page_pptonum(newpp); ASSERT(IS_P2ALIGNED(pfn, ppages)); ASSERT(P2PHASE(pfn, pages) == pgidx); #endif nreloc = 0; ret = page_relocate(&pp, &newpp, 0, 1, &nreloc, NULL); if (ret != 0 || nreloc == 0) { panic("segvn_fill_vp_pages: " "page_relocate failed"); } pp = newpp; while (nreloc-- != 0) { ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_vnode == vp); ASSERT(pgidx == ((pp->p_offset - start_off) >> PAGESHIFT)); ppa[pgidx++] = pp; pp++; } } if (svd->type == MAP_PRIVATE) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[18]); for (i = 0; i < pages; i++) { ASSERT(ppa[i] != NULL); ASSERT(PAGE_EXCL(ppa[i])); ASSERT(ppa[i]->p_vnode == vp); ASSERT(ppa[i]->p_offset == start_off + (i << PAGESHIFT)); page_downgrade(ppa[i]); } ppa[pages] = NULL; } else { VM_STAT_ADD(segvnvmstats.fill_vp_pages[19]); /* * the caller will still call VOP_GETPAGE() for shared segments * to check FS write permissions. For private segments we map * file read only anyway. so no VOP_GETPAGE is needed. */ for (i = 0; i < pages; i++) { ASSERT(ppa[i] != NULL); ASSERT(PAGE_EXCL(ppa[i])); ASSERT(ppa[i]->p_vnode == vp); ASSERT(ppa[i]->p_offset == start_off + (i << PAGESHIFT)); page_unlock(ppa[i]); } ppa[0] = NULL; } return (1); out: /* * Do the cleanup. Unlock target pages we didn't relocate. They are * linked on targ_pplist by root pages. reassemble unused replacement * and io pages back to pplist. */ if (io_pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[20]); pp = io_pplist; do { ASSERT(pp->p_vnode == vp); ASSERT(pp->p_offset == io_off); ASSERT(page_iolock_assert(pp)); page_io_unlock(pp); page_hashout(pp, NULL); io_off += PAGESIZE; } while ((pp = pp->p_next) != io_pplist); page_list_concat(&io_pplist, &pplist); pplist = io_pplist; } tmp_pplist = NULL; while (targ_pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[21]); pp = targ_pplist; ASSERT(PAGE_EXCL(pp)); page_sub(&targ_pplist, pp); pszc = pp->p_szc; ppages = page_get_pagecnt(pszc); ASSERT(IS_P2ALIGNED(page_pptonum(pp), ppages)); if (pszc != 0) { group_page_unlock(pp); } page_unlock(pp); pp = repl_pplist; ASSERT(pp != NULL); ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_szc == szc); page_sub(&repl_pplist, pp); ASSERT(IS_P2ALIGNED(page_pptonum(pp), ppages)); /* relink replacement page */ page_list_concat(&tmp_pplist, &pp); while (--ppages != 0) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[22]); pp++; ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_szc == szc); page_list_concat(&tmp_pplist, &pp); } } if (tmp_pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[23]); page_list_concat(&tmp_pplist, &pplist); pplist = tmp_pplist; } /* * at this point all pages are either on done_pplist or * pplist. They can't be all on done_pplist otherwise * we'd've been done. */ ASSERT(pplist != NULL); if (nios != 0) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[24]); pp = pplist; do { VM_STAT_ADD(segvnvmstats.fill_vp_pages[25]); ASSERT(pp->p_szc == szc); ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_vnode != vp); pp->p_szc = 0; } while ((pp = pp->p_next) != pplist); pp = done_pplist; do { VM_STAT_ADD(segvnvmstats.fill_vp_pages[26]); ASSERT(pp->p_szc == szc); ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_vnode == vp); pp->p_szc = 0; } while ((pp = pp->p_next) != done_pplist); while (pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[27]); pp = pplist; page_sub(&pplist, pp); page_free(pp, 0); } while (done_pplist != NULL) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[28]); pp = done_pplist; page_sub(&done_pplist, pp); page_unlock(pp); } *ppplist = NULL; return (0); } ASSERT(pplist == *ppplist); if (io_err) { VM_STAT_ADD(segvnvmstats.fill_vp_pages[29]); /* * don't downsize on io error. * see if vop_getpage succeeds. * pplist may still be used in this case * for relocations. */ return (0); } VM_STAT_ADD(segvnvmstats.fill_vp_pages[30]); page_free_replacement_page(pplist); page_create_putback(pages); *ppplist = NULL; return (0); } int segvn_anypgsz = 0; #define SEGVN_RESTORE_SOFTLOCK(type, pages) \ if ((type) == F_SOFTLOCK) { \ mutex_enter(&freemem_lock); \ availrmem += (pages); \ segvn_pages_locked -= (pages); \ svd->softlockcnt -= (pages); \ mutex_exit(&freemem_lock); \ } #define SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot) \ if (IS_VMODSORT((ppa)[0]->p_vnode)) { \ if ((rw) == S_WRITE) { \ for (i = 0; i < (pages); i++) { \ ASSERT((ppa)[i]->p_vnode == \ (ppa)[0]->p_vnode); \ hat_setmod((ppa)[i]); \ } \ } else if ((rw) != S_OTHER && \ ((prot) & (vpprot) & PROT_WRITE)) { \ for (i = 0; i < (pages); i++) { \ ASSERT((ppa)[i]->p_vnode == \ (ppa)[0]->p_vnode); \ if (!hat_ismod((ppa)[i])) { \ prot &= ~PROT_WRITE; \ break; \ } \ } \ } \ } #ifdef VM_STATS #define SEGVN_VMSTAT_FLTVNPAGES(idx) \ VM_STAT_ADD(segvnvmstats.fltvnpages[(idx)]); #else /* VM_STATS */ #define SEGVN_VMSTAT_FLTVNPAGES(idx) #endif static faultcode_t segvn_fault_vnodepages(struct hat *hat, struct seg *seg, caddr_t lpgaddr, caddr_t lpgeaddr, enum fault_type type, enum seg_rw rw, caddr_t addr, caddr_t eaddr, int brkcow) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon_map *amp = svd->amp; uchar_t segtype = svd->type; uint_t szc = seg->s_szc; size_t pgsz = page_get_pagesize(szc); size_t maxpgsz = pgsz; pgcnt_t pages = btop(pgsz); pgcnt_t maxpages = pages; size_t ppasize = (pages + 1) * sizeof (page_t *); caddr_t a = lpgaddr; caddr_t maxlpgeaddr = lpgeaddr; u_offset_t off = svd->offset + (uintptr_t)(a - seg->s_base); ulong_t aindx = svd->anon_index + seg_page(seg, a); struct vpage *vpage = (svd->vpage != NULL) ? &svd->vpage[seg_page(seg, a)] : NULL; vnode_t *vp = svd->vp; page_t **ppa; uint_t pszc; size_t ppgsz; pgcnt_t ppages; faultcode_t err = 0; int ierr; int vop_size_err = 0; uint_t protchk, prot, vpprot; ulong_t i; int hat_flag = (type == F_SOFTLOCK) ? HAT_LOAD_LOCK : HAT_LOAD; anon_sync_obj_t an_cookie; enum seg_rw arw; int alloc_failed = 0; int adjszc_chk; struct vattr va; int xhat = 0; page_t *pplist; pfn_t pfn; int physcontig; int upgrdfail; int segvn_anypgsz_vnode = 0; /* for now map vnode with 2 page sizes */ ASSERT(szc != 0); ASSERT(vp != NULL); ASSERT(brkcow == 0 || amp != NULL); ASSERT(enable_mbit_wa == 0); /* no mbit simulations with large pages */ ASSERT(!(svd->flags & MAP_NORESERVE)); ASSERT(type != F_SOFTUNLOCK); ASSERT(IS_P2ALIGNED(a, maxpgsz)); ASSERT(amp == NULL || IS_P2ALIGNED(aindx, maxpages)); ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock)); ASSERT(seg->s_szc < NBBY * sizeof (int)); ASSERT(type != F_SOFTLOCK || lpgeaddr - a == maxpgsz); VM_STAT_COND_ADD(type == F_SOFTLOCK, segvnvmstats.fltvnpages[0]); VM_STAT_COND_ADD(type != F_SOFTLOCK, segvnvmstats.fltvnpages[1]); if (svd->flags & MAP_TEXT) { hat_flag |= HAT_LOAD_TEXT; } if (svd->pageprot) { switch (rw) { case S_READ: protchk = PROT_READ; break; case S_WRITE: protchk = PROT_WRITE; break; case S_EXEC: protchk = PROT_EXEC; break; case S_OTHER: default: protchk = PROT_READ | PROT_WRITE | PROT_EXEC; break; } } else { prot = svd->prot; /* caller has already done segment level protection check. */ } if (seg->s_as->a_hat != hat) { xhat = 1; } if (rw == S_WRITE && segtype == MAP_PRIVATE) { SEGVN_VMSTAT_FLTVNPAGES(2); arw = S_READ; } else { arw = rw; } ppa = kmem_alloc(ppasize, KM_SLEEP); VM_STAT_COND_ADD(amp != NULL, segvnvmstats.fltvnpages[3]); for (;;) { adjszc_chk = 0; for (; a < lpgeaddr; a += pgsz, off += pgsz, aindx += pages) { if (adjszc_chk) { while (szc < seg->s_szc) { uintptr_t e; uint_t tszc; tszc = segvn_anypgsz_vnode ? szc + 1 : seg->s_szc; ppgsz = page_get_pagesize(tszc); if (!IS_P2ALIGNED(a, ppgsz) || ((alloc_failed >> tszc) & 0x1)) { break; } SEGVN_VMSTAT_FLTVNPAGES(4); szc = tszc; pgsz = ppgsz; pages = btop(pgsz); e = P2ROUNDUP((uintptr_t)eaddr, pgsz); lpgeaddr = (caddr_t)e; } } again: if (IS_P2ALIGNED(a, maxpgsz) && amp != NULL) { ASSERT(IS_P2ALIGNED(aindx, maxpages)); ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_array_enter(amp, aindx, &an_cookie); if (anon_get_ptr(amp->ahp, aindx) != NULL) { SEGVN_VMSTAT_FLTVNPAGES(5); if (anon_pages(amp->ahp, aindx, maxpages) != maxpages) { panic("segvn_fault_vnodepages:" " empty anon slots\n"); } anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); err = segvn_fault_anonpages(hat, seg, a, a + maxpgsz, type, rw, MAX(a, addr), MIN(a + maxpgsz, eaddr), brkcow); if (err != 0) { SEGVN_VMSTAT_FLTVNPAGES(6); goto out; } if (szc < seg->s_szc) { szc = seg->s_szc; pgsz = maxpgsz; pages = maxpages; lpgeaddr = maxlpgeaddr; } goto next; } else if (anon_pages(amp->ahp, aindx, maxpages)) { panic("segvn_fault_vnodepages:" " non empty anon slots\n"); } else { SEGVN_VMSTAT_FLTVNPAGES(7); anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } } ASSERT(!brkcow || IS_P2ALIGNED(a, maxpgsz)); if (svd->pageprot != 0 && IS_P2ALIGNED(a, maxpgsz)) { ASSERT(vpage != NULL); prot = VPP_PROT(vpage); ASSERT(sameprot(seg, a, maxpgsz)); if ((prot & protchk) == 0) { SEGVN_VMSTAT_FLTVNPAGES(8); err = FC_PROT; goto out; } } if (type == F_SOFTLOCK) { mutex_enter(&freemem_lock); if (availrmem < tune.t_minarmem + pages) { mutex_exit(&freemem_lock); err = FC_MAKE_ERR(ENOMEM); goto out; } else { availrmem -= pages; segvn_pages_locked += pages; svd->softlockcnt += pages; } mutex_exit(&freemem_lock); } pplist = NULL; physcontig = 0; ppa[0] = NULL; if (!brkcow && szc && !page_exists_physcontig(vp, off, szc, segtype == MAP_PRIVATE ? ppa : NULL)) { SEGVN_VMSTAT_FLTVNPAGES(9); if (page_alloc_pages(vp, seg, a, &pplist, NULL, szc, 0) && type != F_SOFTLOCK) { SEGVN_VMSTAT_FLTVNPAGES(10); pszc = 0; ierr = -1; alloc_failed |= (1 << szc); break; } if (pplist != NULL && vp->v_mpssdata == SEGVN_PAGEIO) { int downsize; SEGVN_VMSTAT_FLTVNPAGES(11); physcontig = segvn_fill_vp_pages(svd, vp, off, szc, ppa, &pplist, &pszc, &downsize); ASSERT(!physcontig || pplist == NULL); if (!physcontig && downsize && type != F_SOFTLOCK) { ASSERT(pplist == NULL); SEGVN_VMSTAT_FLTVNPAGES(12); ierr = -1; break; } ASSERT(!physcontig || segtype == MAP_PRIVATE || ppa[0] == NULL); if (physcontig && ppa[0] == NULL) { physcontig = 0; } } } else if (!brkcow && szc && ppa[0] != NULL) { SEGVN_VMSTAT_FLTVNPAGES(13); ASSERT(segtype == MAP_PRIVATE); physcontig = 1; } if (!physcontig) { SEGVN_VMSTAT_FLTVNPAGES(14); ppa[0] = NULL; ierr = VOP_GETPAGE(vp, (offset_t)off, pgsz, &vpprot, ppa, pgsz, seg, a, arw, svd->cred); if (segtype == MAP_PRIVATE) { SEGVN_VMSTAT_FLTVNPAGES(15); vpprot &= ~PROT_WRITE; } } else { ASSERT(segtype == MAP_PRIVATE); SEGVN_VMSTAT_FLTVNPAGES(16); vpprot = PROT_ALL & ~PROT_WRITE; ierr = 0; } if (ierr != 0) { SEGVN_VMSTAT_FLTVNPAGES(17); if (pplist != NULL) { SEGVN_VMSTAT_FLTVNPAGES(18); page_free_replacement_page(pplist); page_create_putback(pages); } SEGVN_RESTORE_SOFTLOCK(type, pages); if (a + pgsz <= eaddr) { SEGVN_VMSTAT_FLTVNPAGES(19); err = FC_MAKE_ERR(ierr); goto out; } va.va_mask = AT_SIZE; if (VOP_GETATTR(vp, &va, 0, svd->cred) != 0) { SEGVN_VMSTAT_FLTVNPAGES(20); err = FC_MAKE_ERR(EIO); goto out; } if (btopr(va.va_size) >= btopr(off + pgsz)) { SEGVN_VMSTAT_FLTVNPAGES(21); err = FC_MAKE_ERR(ierr); goto out; } if (btopr(va.va_size) < btopr(off + (eaddr - a))) { SEGVN_VMSTAT_FLTVNPAGES(22); err = FC_MAKE_ERR(ierr); goto out; } if (brkcow || type == F_SOFTLOCK) { /* can't reduce map area */ SEGVN_VMSTAT_FLTVNPAGES(23); vop_size_err = 1; goto out; } SEGVN_VMSTAT_FLTVNPAGES(24); ASSERT(szc != 0); pszc = 0; ierr = -1; break; } if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_array_enter(amp, aindx, &an_cookie); } if (amp != NULL && anon_get_ptr(amp->ahp, aindx) != NULL) { ulong_t taindx = P2ALIGN(aindx, maxpages); SEGVN_VMSTAT_FLTVNPAGES(25); if (anon_pages(amp->ahp, taindx, maxpages) != maxpages) { panic("segvn_fault_vnodepages:" " empty anon slots\n"); } for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); if (pplist != NULL) { page_free_replacement_page(pplist); page_create_putback(pages); } SEGVN_RESTORE_SOFTLOCK(type, pages); if (szc < seg->s_szc) { SEGVN_VMSTAT_FLTVNPAGES(26); /* * For private segments SOFTLOCK * either always breaks cow (any rw * type except S_READ_NOCOW) or * address space is locked as writer * (S_READ_NOCOW case) and anon slots * can't show up on second check. * Therefore if we are here for * SOFTLOCK case it must be a cow * break but cow break never reduces * szc. Thus the assert below. */ ASSERT(!brkcow && type != F_SOFTLOCK); pszc = seg->s_szc; ierr = -2; break; } ASSERT(IS_P2ALIGNED(a, maxpgsz)); goto again; } #ifdef DEBUG if (amp != NULL) { ulong_t taindx = P2ALIGN(aindx, maxpages); ASSERT(!anon_pages(amp->ahp, taindx, maxpages)); } #endif /* DEBUG */ if (brkcow) { ASSERT(amp != NULL); ASSERT(pplist == NULL); ASSERT(szc == seg->s_szc); ASSERT(IS_P2ALIGNED(a, maxpgsz)); ASSERT(IS_P2ALIGNED(aindx, maxpages)); SEGVN_VMSTAT_FLTVNPAGES(27); ierr = anon_map_privatepages(amp, aindx, szc, seg, a, prot, ppa, vpage, segvn_anypgsz, svd->cred); if (ierr != 0) { SEGVN_VMSTAT_FLTVNPAGES(28); anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); SEGVN_RESTORE_SOFTLOCK(type, pages); err = FC_MAKE_ERR(ierr); goto out; } ASSERT(!IS_VMODSORT(ppa[0]->p_vnode)); /* * p_szc can't be changed for locked * swapfs pages. */ hat_memload_array(hat, a, pgsz, ppa, prot, hat_flag); if (!(hat_flag & HAT_LOAD_LOCK)) { SEGVN_VMSTAT_FLTVNPAGES(29); for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } } anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); goto next; } pfn = page_pptonum(ppa[0]); /* * hat_page_demote() needs an EXCl lock on one of * constituent page_t's and it decreases root's p_szc * last. This means if root's p_szc is equal szc and * all its constituent pages are locked * hat_page_demote() that could have changed p_szc to * szc is already done and no new have page_demote() * can start for this large page. */ /* * we need to make sure same mapping size is used for * the same address range if there's a possibility the * adddress is already mapped because hat layer panics * when translation is loaded for the range already * mapped with a different page size. We achieve it * by always using largest page size possible subject * to the constraints of page size, segment page size * and page alignment. Since mappings are invalidated * when those constraints change and make it * impossible to use previously used mapping size no * mapping size conflicts should happen. */ chkszc: if ((pszc = ppa[0]->p_szc) == szc && IS_P2ALIGNED(pfn, pages)) { SEGVN_VMSTAT_FLTVNPAGES(30); #ifdef DEBUG for (i = 0; i < pages; i++) { ASSERT(PAGE_LOCKED(ppa[i])); ASSERT(!PP_ISFREE(ppa[i])); ASSERT(page_pptonum(ppa[i]) == pfn + i); ASSERT(ppa[i]->p_szc == szc); ASSERT(ppa[i]->p_vnode == vp); ASSERT(ppa[i]->p_offset == off + (i << PAGESHIFT)); } #endif /* DEBUG */ /* * All pages are of szc we need and they are * all locked so they can't change szc. load * translations. * * if page got promoted since last check * we don't need pplist. */ if (pplist != NULL) { page_free_replacement_page(pplist); page_create_putback(pages); } if (PP_ISMIGRATE(ppa[0])) { page_migrate(seg, a, ppa, pages); } SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot); if (!xhat) { hat_memload_array(hat, a, pgsz, ppa, prot & vpprot, hat_flag); } else { /* * avoid large xhat mappings to FS * pages so that hat_page_demote() * doesn't need to check for xhat * large mappings. */ for (i = 0; i < pages; i++) { hat_memload(hat, a + (i << PAGESHIFT), ppa[i], prot & vpprot, hat_flag); } } if (!(hat_flag & HAT_LOAD_LOCK)) { for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } goto next; } /* * See if upsize is possible. */ if (pszc > szc && szc < seg->s_szc && (segvn_anypgsz_vnode || pszc >= seg->s_szc)) { pgcnt_t aphase; uint_t pszc1 = MIN(pszc, seg->s_szc); ppgsz = page_get_pagesize(pszc1); ppages = btop(ppgsz); aphase = btop(P2PHASE((uintptr_t)a, ppgsz)); ASSERT(type != F_SOFTLOCK); SEGVN_VMSTAT_FLTVNPAGES(31); if (aphase != P2PHASE(pfn, ppages)) { segvn_faultvnmpss_align_err4++; } else { SEGVN_VMSTAT_FLTVNPAGES(32); if (pplist != NULL) { page_t *pl = pplist; page_free_replacement_page(pl); page_create_putback(pages); } for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } pszc = pszc1; ierr = -2; break; } } /* * check if we should use smallest mapping size. */ upgrdfail = 0; if (szc == 0 || xhat || (pszc >= szc && !IS_P2ALIGNED(pfn, pages)) || (pszc < szc && !segvn_full_szcpages(ppa, szc, &upgrdfail, &pszc))) { if (upgrdfail && type != F_SOFTLOCK) { /* * segvn_full_szcpages failed to lock * all pages EXCL. Size down. */ ASSERT(pszc < szc); SEGVN_VMSTAT_FLTVNPAGES(33); if (pplist != NULL) { page_t *pl = pplist; page_free_replacement_page(pl); page_create_putback(pages); } for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } ierr = -1; break; } if (szc != 0 && !xhat) { segvn_faultvnmpss_align_err5++; } SEGVN_VMSTAT_FLTVNPAGES(34); if (pplist != NULL) { page_free_replacement_page(pplist); page_create_putback(pages); } SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot); for (i = 0; i < pages; i++) { hat_memload(hat, a + (i << PAGESHIFT), ppa[i], prot & vpprot, hat_flag); } if (!(hat_flag & HAT_LOAD_LOCK)) { for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } goto next; } if (pszc == szc) { /* * segvn_full_szcpages() upgraded pages szc. */ ASSERT(pszc == ppa[0]->p_szc); ASSERT(IS_P2ALIGNED(pfn, pages)); goto chkszc; } if (pszc > szc) { kmutex_t *szcmtx; SEGVN_VMSTAT_FLTVNPAGES(35); /* * p_szc of ppa[0] can change since we haven't * locked all constituent pages. Call * page_lock_szc() to prevent szc changes. * This should be a rare case that happens when * multiple segments use a different page size * to map the same file offsets. */ szcmtx = page_szc_lock(ppa[0]); pszc = ppa[0]->p_szc; ASSERT(szcmtx != NULL || pszc == 0); ASSERT(ppa[0]->p_szc <= pszc); if (pszc <= szc) { SEGVN_VMSTAT_FLTVNPAGES(36); if (szcmtx != NULL) { mutex_exit(szcmtx); } goto chkszc; } if (pplist != NULL) { /* * page got promoted since last check. * we don't need preaalocated large * page. */ SEGVN_VMSTAT_FLTVNPAGES(37); page_free_replacement_page(pplist); page_create_putback(pages); } SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot); hat_memload_array(hat, a, pgsz, ppa, prot & vpprot, hat_flag); mutex_exit(szcmtx); if (!(hat_flag & HAT_LOAD_LOCK)) { for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } goto next; } /* * if page got demoted since last check * we could have not allocated larger page. * allocate now. */ if (pplist == NULL && page_alloc_pages(vp, seg, a, &pplist, NULL, szc, 0) && type != F_SOFTLOCK) { SEGVN_VMSTAT_FLTVNPAGES(38); for (i = 0; i < pages; i++) { page_unlock(ppa[i]); } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } ierr = -1; alloc_failed |= (1 << szc); break; } SEGVN_VMSTAT_FLTVNPAGES(39); if (pplist != NULL) { segvn_relocate_pages(ppa, pplist); #ifdef DEBUG } else { ASSERT(type == F_SOFTLOCK); SEGVN_VMSTAT_FLTVNPAGES(40); #endif /* DEBUG */ } SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot); if (pplist == NULL && segvn_anypgsz_vnode == 0) { ASSERT(type == F_SOFTLOCK); for (i = 0; i < pages; i++) { ASSERT(ppa[i]->p_szc < szc); hat_memload(hat, a + (i << PAGESHIFT), ppa[i], prot & vpprot, hat_flag); } } else { ASSERT(pplist != NULL || type == F_SOFTLOCK); hat_memload_array(hat, a, pgsz, ppa, prot & vpprot, hat_flag); } if (!(hat_flag & HAT_LOAD_LOCK)) { for (i = 0; i < pages; i++) { ASSERT(PAGE_SHARED(ppa[i])); page_unlock(ppa[i]); } } if (amp != NULL) { anon_array_exit(&an_cookie); ANON_LOCK_EXIT(&->a_rwlock); } next: if (vpage != NULL) { vpage += pages; } adjszc_chk = 1; } if (a == lpgeaddr) break; ASSERT(a < lpgeaddr); ASSERT(!brkcow && type != F_SOFTLOCK); /* * ierr == -1 means we failed to map with a large page. * (either due to allocation/relocation failures or * misalignment with other mappings to this file. * * ierr == -2 means some other thread allocated a large page * after we gave up tp map with a large page. retry with * larger mapping. */ ASSERT(ierr == -1 || ierr == -2); ASSERT(ierr == -2 || szc != 0); ASSERT(ierr == -1 || szc < seg->s_szc); if (ierr == -2) { SEGVN_VMSTAT_FLTVNPAGES(41); ASSERT(pszc > szc && pszc <= seg->s_szc); szc = pszc; } else if (segvn_anypgsz_vnode) { SEGVN_VMSTAT_FLTVNPAGES(42); szc--; } else { SEGVN_VMSTAT_FLTVNPAGES(43); ASSERT(pszc < szc); /* * other process created pszc large page. * but we still have to drop to 0 szc. */ szc = 0; } pgsz = page_get_pagesize(szc); pages = btop(pgsz); if (ierr == -2) { /* * Size up case. Note lpgaddr may only be needed for * softlock case so we don't adjust it here. */ a = (caddr_t)P2ALIGN((uintptr_t)a, pgsz); ASSERT(a >= lpgaddr); lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz); off = svd->offset + (uintptr_t)(a - seg->s_base); aindx = svd->anon_index + seg_page(seg, a); vpage = (svd->vpage != NULL) ? &svd->vpage[seg_page(seg, a)] : NULL; } else { /* * Size down case. Note lpgaddr may only be needed for * softlock case so we don't adjust it here. */ ASSERT(IS_P2ALIGNED(a, pgsz)); ASSERT(IS_P2ALIGNED(lpgeaddr, pgsz)); lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz); ASSERT(a < lpgeaddr); if (a < addr) { SEGVN_VMSTAT_FLTVNPAGES(44); /* * The beginning of the large page region can * be pulled to the right to make a smaller * region. We haven't yet faulted a single * page. */ a = (caddr_t)P2ALIGN((uintptr_t)addr, pgsz); ASSERT(a >= lpgaddr); off = svd->offset + (uintptr_t)(a - seg->s_base); aindx = svd->anon_index + seg_page(seg, a); vpage = (svd->vpage != NULL) ? &svd->vpage[seg_page(seg, a)] : NULL; } } } out: kmem_free(ppa, ppasize); if (!err && !vop_size_err) { SEGVN_VMSTAT_FLTVNPAGES(45); return (0); } if (type == F_SOFTLOCK && a > lpgaddr) { SEGVN_VMSTAT_FLTVNPAGES(46); segvn_softunlock(seg, lpgaddr, a - lpgaddr, S_OTHER); } if (!vop_size_err) { SEGVN_VMSTAT_FLTVNPAGES(47); return (err); } ASSERT(brkcow || type == F_SOFTLOCK); /* * Large page end is mapped beyond the end of file and it's a cow * fault or softlock so we can't reduce the map area. For now just * demote the segment. This should really only happen if the end of * the file changed after the mapping was established since when large * page segments are created we make sure they don't extend beyond the * end of the file. */ SEGVN_VMSTAT_FLTVNPAGES(48); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER); err = 0; if (seg->s_szc != 0) { segvn_fltvnpages_clrszc_cnt++; ASSERT(svd->softlockcnt == 0); err = segvn_clrszc(seg); if (err != 0) { segvn_fltvnpages_clrszc_err++; } } ASSERT(err || seg->s_szc == 0); SEGVN_LOCK_DOWNGRADE(seg->s_as, &svd->lock); /* segvn_fault will do its job as if szc had been zero to begin with */ return (err == 0 ? IE_RETRY : FC_MAKE_ERR(err)); } /* * This routine will attempt to fault in one large page. * it will use smaller pages if that fails. * It should only be called for pure anonymous segments. */ static faultcode_t segvn_fault_anonpages(struct hat *hat, struct seg *seg, caddr_t lpgaddr, caddr_t lpgeaddr, enum fault_type type, enum seg_rw rw, caddr_t addr, caddr_t eaddr, int brkcow) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon_map *amp = svd->amp; uchar_t segtype = svd->type; uint_t szc = seg->s_szc; size_t pgsz = page_get_pagesize(szc); size_t maxpgsz = pgsz; pgcnt_t pages = btop(pgsz); size_t ppasize = pages * sizeof (page_t *); caddr_t a = lpgaddr; ulong_t aindx = svd->anon_index + seg_page(seg, a); struct vpage *vpage = (svd->vpage != NULL) ? &svd->vpage[seg_page(seg, a)] : NULL; page_t **ppa; uint_t ppa_szc; faultcode_t err; int ierr; uint_t protchk, prot, vpprot; int i; int hat_flag = (type == F_SOFTLOCK) ? HAT_LOAD_LOCK : HAT_LOAD; anon_sync_obj_t cookie; ASSERT(szc != 0); ASSERT(amp != NULL); ASSERT(enable_mbit_wa == 0); /* no mbit simulations with large pages */ ASSERT(!(svd->flags & MAP_NORESERVE)); ASSERT(type != F_SOFTUNLOCK); ASSERT(segtype == MAP_PRIVATE); ASSERT(IS_P2ALIGNED(a, maxpgsz)); ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock)); VM_STAT_COND_ADD(type == F_SOFTLOCK, segvnvmstats.fltanpages[0]); VM_STAT_COND_ADD(type != F_SOFTLOCK, segvnvmstats.fltanpages[1]); if (svd->flags & MAP_TEXT) { hat_flag |= HAT_LOAD_TEXT; } if (svd->pageprot) { switch (rw) { case S_READ: protchk = PROT_READ; break; case S_WRITE: protchk = PROT_WRITE; break; case S_EXEC: protchk = PROT_EXEC; break; case S_OTHER: default: protchk = PROT_READ | PROT_WRITE | PROT_EXEC; break; } VM_STAT_ADD(segvnvmstats.fltanpages[2]); } else { prot = svd->prot; /* caller has already done segment level protection check. */ } ppa = kmem_alloc(ppasize, KM_SLEEP); ANON_LOCK_ENTER(&->a_rwlock, RW_READER); for (;;) { for (; a < lpgeaddr; a += pgsz, aindx += pages) { if (svd->pageprot != 0 && IS_P2ALIGNED(a, maxpgsz)) { VM_STAT_ADD(segvnvmstats.fltanpages[3]); ASSERT(vpage != NULL); prot = VPP_PROT(vpage); ASSERT(sameprot(seg, a, maxpgsz)); if ((prot & protchk) == 0) { err = FC_PROT; goto error; } } if (type == F_SOFTLOCK) { mutex_enter(&freemem_lock); if (availrmem < tune.t_minarmem + pages) { mutex_exit(&freemem_lock); err = FC_MAKE_ERR(ENOMEM); goto error; } else { availrmem -= pages; segvn_pages_locked += pages; svd->softlockcnt += pages; } mutex_exit(&freemem_lock); } anon_array_enter(amp, aindx, &cookie); ppa_szc = (uint_t)-1; ierr = anon_map_getpages(amp, aindx, szc, seg, a, prot, &vpprot, ppa, &ppa_szc, vpage, rw, brkcow, segvn_anypgsz, svd->cred); if (ierr != 0) { anon_array_exit(&cookie); VM_STAT_ADD(segvnvmstats.fltanpages[4]); if (type == F_SOFTLOCK) { VM_STAT_ADD(segvnvmstats.fltanpages[5]); mutex_enter(&freemem_lock); availrmem += pages; segvn_pages_locked -= pages; svd->softlockcnt -= pages; mutex_exit(&freemem_lock); } if (ierr > 0) { VM_STAT_ADD(segvnvmstats.fltanpages[6]); err = FC_MAKE_ERR(ierr); goto error; } break; } ASSERT(!IS_VMODSORT(ppa[0]->p_vnode)); /* * Handle pages that have been marked for migration */ if (lgrp_optimizations()) page_migrate(seg, a, ppa, pages); hat_memload_array(hat, a, pgsz, ppa, prot & vpprot, hat_flag); if (hat_flag & HAT_LOAD_LOCK) { VM_STAT_ADD(segvnvmstats.fltanpages[7]); } else { VM_STAT_ADD(segvnvmstats.fltanpages[8]); for (i = 0; i < pages; i++) page_unlock(ppa[i]); } if (vpage != NULL) vpage += pages; anon_array_exit(&cookie); } if (a == lpgeaddr) break; ASSERT(a < lpgeaddr); /* * ierr == -1 means we failed to allocate a large page. * so do a size down operation. * * ierr == -2 means some other process that privately shares * pages with this process has allocated a larger page and we * need to retry with larger pages. So do a size up * operation. This relies on the fact that large pages are * never partially shared i.e. if we share any constituent * page of a large page with another process we must share the * entire large page. Note this cannot happen for SOFTLOCK * case, unless current address (a) is at the beginning of the * next page size boundary because the other process couldn't * have relocated locked pages. */ ASSERT(ierr == -1 || ierr == -2); if (segvn_anypgsz) { ASSERT(ierr == -2 || szc != 0); ASSERT(ierr == -1 || szc < seg->s_szc); szc = (ierr == -1) ? szc - 1 : szc + 1; } else { /* * For non COW faults and segvn_anypgsz == 0 * we need to be careful not to loop forever * if existing page is found with szc other * than 0 or seg->s_szc. This could be due * to page relocations on behalf of DR or * more likely large page creation. For this * case simply re-size to existing page's szc * if returned by anon_map_getpages(). */ if (ppa_szc == (uint_t)-1) { szc = (ierr == -1) ? 0 : seg->s_szc; } else { ASSERT(ppa_szc <= seg->s_szc); ASSERT(ierr == -2 || ppa_szc < szc); ASSERT(ierr == -1 || ppa_szc > szc); szc = ppa_szc; } } pgsz = page_get_pagesize(szc); pages = btop(pgsz); ASSERT(type != F_SOFTLOCK || ierr == -1 || (IS_P2ALIGNED(a, pgsz) && IS_P2ALIGNED(lpgeaddr, pgsz))); if (type == F_SOFTLOCK) { /* * For softlocks we cannot reduce the fault area * (calculated based on the largest page size for this * segment) for size down and a is already next * page size aligned as assertted above for size * ups. Therefore just continue in case of softlock. */ VM_STAT_ADD(segvnvmstats.fltanpages[9]); continue; /* keep lint happy */ } else if (ierr == -2) { /* * Size up case. Note lpgaddr may only be needed for * softlock case so we don't adjust it here. */ VM_STAT_ADD(segvnvmstats.fltanpages[10]); a = (caddr_t)P2ALIGN((uintptr_t)a, pgsz); ASSERT(a >= lpgaddr); lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz); aindx = svd->anon_index + seg_page(seg, a); vpage = (svd->vpage != NULL) ? &svd->vpage[seg_page(seg, a)] : NULL; } else { /* * Size down case. Note lpgaddr may only be needed for * softlock case so we don't adjust it here. */ VM_STAT_ADD(segvnvmstats.fltanpages[11]); ASSERT(IS_P2ALIGNED(a, pgsz)); ASSERT(IS_P2ALIGNED(lpgeaddr, pgsz)); lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz); ASSERT(a < lpgeaddr); if (a < addr) { /* * The beginning of the large page region can * be pulled to the right to make a smaller * region. We haven't yet faulted a single * page. */ VM_STAT_ADD(segvnvmstats.fltanpages[12]); a = (caddr_t)P2ALIGN((uintptr_t)addr, pgsz); ASSERT(a >= lpgaddr); aindx = svd->anon_index + seg_page(seg, a); vpage = (svd->vpage != NULL) ? &svd->vpage[seg_page(seg, a)] : NULL; } } } VM_STAT_ADD(segvnvmstats.fltanpages[13]); ANON_LOCK_EXIT(&->a_rwlock); kmem_free(ppa, ppasize); return (0); error: VM_STAT_ADD(segvnvmstats.fltanpages[14]); ANON_LOCK_EXIT(&->a_rwlock); kmem_free(ppa, ppasize); if (type == F_SOFTLOCK && a > lpgaddr) { VM_STAT_ADD(segvnvmstats.fltanpages[15]); segvn_softunlock(seg, lpgaddr, a - lpgaddr, S_OTHER); } return (err); } int fltadvice = 1; /* set to free behind pages for sequential access */ /* * This routine is called via a machine specific fault handling routine. * It is also called by software routines wishing to lock or unlock * a range of addresses. * * Here is the basic algorithm: * If unlocking * Call segvn_softunlock * Return * endif * Checking and set up work * If we will need some non-anonymous pages * Call VOP_GETPAGE over the range of non-anonymous pages * endif * Loop over all addresses requested * Call segvn_faultpage passing in page list * to load up translations and handle anonymous pages * endloop * Load up translation to any additional pages in page list not * already handled that fit into this segment */ static faultcode_t segvn_fault(struct hat *hat, struct seg *seg, caddr_t addr, size_t len, enum fault_type type, enum seg_rw rw) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; page_t **plp, **ppp, *pp; u_offset_t off; caddr_t a; struct vpage *vpage; uint_t vpprot, prot; int err; page_t *pl[PVN_GETPAGE_NUM + 1]; size_t plsz, pl_alloc_sz; size_t page; ulong_t anon_index; struct anon_map *amp; int dogetpage = 0; caddr_t lpgaddr, lpgeaddr; size_t pgsz; anon_sync_obj_t cookie; int brkcow = BREAK_COW_SHARE(rw, type, svd->type); ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); /* * First handle the easy stuff */ if (type == F_SOFTUNLOCK) { if (rw == S_READ_NOCOW) { rw = S_READ; ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); } SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); pgsz = (seg->s_szc == 0) ? PAGESIZE : page_get_pagesize(seg->s_szc); VM_STAT_COND_ADD(pgsz > PAGESIZE, segvnvmstats.fltanpages[16]); CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr); segvn_softunlock(seg, lpgaddr, lpgeaddr - lpgaddr, rw); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } top: SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); /* * If we have the same protections for the entire segment, * insure that the access being attempted is legitimate. */ if (svd->pageprot == 0) { uint_t protchk; switch (rw) { case S_READ: case S_READ_NOCOW: protchk = PROT_READ; break; case S_WRITE: protchk = PROT_WRITE; break; case S_EXEC: protchk = PROT_EXEC; break; case S_OTHER: default: protchk = PROT_READ | PROT_WRITE | PROT_EXEC; break; } if ((svd->prot & protchk) == 0) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (FC_PROT); /* illegal access type */ } } /* * We can't allow the long term use of softlocks for vmpss segments, * because in some file truncation cases we should be able to demote * the segment, which requires that there are no softlocks. The * only case where it's ok to allow a SOFTLOCK fault against a vmpss * segment is S_READ_NOCOW, where the caller holds the address space * locked as writer and calls softunlock before dropping the as lock. * S_READ_NOCOW is used by /proc to read memory from another user. * * Another deadlock between SOFTLOCK and file truncation can happen * because segvn_fault_vnodepages() calls the FS one pagesize at * a time. A second VOP_GETPAGE() call by segvn_fault_vnodepages() * can cause a deadlock because the first set of page_t's remain * locked SE_SHARED. To avoid this, we demote segments on a first * SOFTLOCK if they have a length greater than the segment's * page size. * * So for now, we only avoid demoting a segment on a SOFTLOCK when * the access type is S_READ_NOCOW and the fault length is less than * or equal to the segment's page size. While this is quite restrictive, * it should be the most common case of SOFTLOCK against a vmpss * segment. * * For S_READ_NOCOW, it's safe not to do a copy on write because the * caller makes sure no COW will be caused by another thread for a * softlocked page. */ if (type == F_SOFTLOCK && svd->vp != NULL && seg->s_szc != 0) { int demote = 0; if (rw != S_READ_NOCOW) { demote = 1; } if (!demote && len > PAGESIZE) { pgsz = page_get_pagesize(seg->s_szc); CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr); if (lpgeaddr - lpgaddr > pgsz) { demote = 1; } } ASSERT(demote || AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); if (demote) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER); if (seg->s_szc != 0) { segvn_vmpss_clrszc_cnt++; ASSERT(svd->softlockcnt == 0); err = segvn_clrszc(seg); if (err) { segvn_vmpss_clrszc_err++; SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (FC_MAKE_ERR(err)); } } ASSERT(seg->s_szc == 0); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); goto top; } } /* * Check to see if we need to allocate an anon_map structure. */ if (svd->amp == NULL && (svd->vp == NULL || brkcow)) { /* * Drop the "read" lock on the segment and acquire * the "write" version since we have to allocate the * anon_map. */ SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER); if (svd->amp == NULL) { svd->amp = anonmap_alloc(seg->s_size, 0); svd->amp->a_szc = seg->s_szc; } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); /* * Start all over again since segment protections * may have changed after we dropped the "read" lock. */ goto top; } /* * S_READ_NOCOW vs S_READ distinction was * only needed for the code above. After * that we treat it as S_READ. */ if (rw == S_READ_NOCOW) { ASSERT(type == F_SOFTLOCK); ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); rw = S_READ; } amp = svd->amp; /* * MADV_SEQUENTIAL work is ignored for large page segments. */ if (seg->s_szc != 0) { pgsz = page_get_pagesize(seg->s_szc); ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock)); /* * We may need to do relocations so purge seg_pcache to allow * pages to be locked exclusively. */ if (svd->softlockcnt != 0) segvn_purge(seg); CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr); if (svd->vp == NULL) { ASSERT(svd->type == MAP_PRIVATE); err = segvn_fault_anonpages(hat, seg, lpgaddr, lpgeaddr, type, rw, addr, addr + len, brkcow); } else { err = segvn_fault_vnodepages(hat, seg, lpgaddr, lpgeaddr, type, rw, addr, addr + len, brkcow); if (err == IE_RETRY) { ASSERT(seg->s_szc == 0); ASSERT(SEGVN_READ_HELD(seg->s_as, &svd->lock)); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); goto top; } } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (err); } page = seg_page(seg, addr); if (amp != NULL) { anon_index = svd->anon_index + page; if ((type == F_PROT) && (rw == S_READ) && svd->type == MAP_PRIVATE && svd->pageprot == 0) { size_t index = anon_index; struct anon *ap; ANON_LOCK_ENTER(&->a_rwlock, RW_READER); /* * The fast path could apply to S_WRITE also, except * that the protection fault could be caused by lazy * tlb flush when ro->rw. In this case, the pte is * RW already. But RO in the other cpu's tlb causes * the fault. Since hat_chgprot won't do anything if * pte doesn't change, we may end up faulting * indefinitely until the RO tlb entry gets replaced. */ for (a = addr; a < addr + len; a += PAGESIZE, index++) { anon_array_enter(amp, index, &cookie); ap = anon_get_ptr(amp->ahp, index); anon_array_exit(&cookie); if ((ap == NULL) || (ap->an_refcnt != 1)) { ANON_LOCK_EXIT(&->a_rwlock); goto slow; } } hat_chgprot(seg->s_as->a_hat, addr, len, svd->prot); ANON_LOCK_EXIT(&->a_rwlock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } } slow: if (svd->vpage == NULL) vpage = NULL; else vpage = &svd->vpage[page]; off = svd->offset + (uintptr_t)(addr - seg->s_base); /* * If MADV_SEQUENTIAL has been set for the particular page we * are faulting on, free behind all pages in the segment and put * them on the free list. */ if ((page != 0) && fltadvice) { /* not if first page in segment */ struct vpage *vpp; ulong_t fanon_index; size_t fpage; u_offset_t pgoff, fpgoff; struct vnode *fvp; struct anon *fap = NULL; if (svd->advice == MADV_SEQUENTIAL || (svd->pageadvice && VPP_ADVICE(vpage) == MADV_SEQUENTIAL)) { pgoff = off - PAGESIZE; fpage = page - 1; if (vpage != NULL) vpp = &svd->vpage[fpage]; if (amp != NULL) fanon_index = svd->anon_index + fpage; while (pgoff > svd->offset) { if (svd->advice != MADV_SEQUENTIAL && (!svd->pageadvice || (vpage && VPP_ADVICE(vpp) != MADV_SEQUENTIAL))) break; /* * If this is an anon page, we must find the * correct for it */ fap = NULL; if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_array_enter(amp, fanon_index, &cookie); fap = anon_get_ptr(amp->ahp, fanon_index); if (fap != NULL) { swap_xlate(fap, &fvp, &fpgoff); } else { fpgoff = pgoff; fvp = svd->vp; } anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); } else { fpgoff = pgoff; fvp = svd->vp; } if (fvp == NULL) break; /* XXX */ /* * Skip pages that are free or have an * "exclusive" lock. */ pp = page_lookup_nowait(fvp, fpgoff, SE_SHARED); if (pp == NULL) break; /* * We don't need the page_struct_lock to test * as this is only advisory; even if we * acquire it someone might race in and lock * the page after we unlock and before the * PUTPAGE, then VOP_PUTPAGE will do nothing. */ if (pp->p_lckcnt == 0 && pp->p_cowcnt == 0) { /* * Hold the vnode before releasing * the page lock to prevent it from * being freed and re-used by some * other thread. */ VN_HOLD(fvp); page_unlock(pp); /* * We should build a page list * to kluster putpages XXX */ (void) VOP_PUTPAGE(fvp, (offset_t)fpgoff, PAGESIZE, (B_DONTNEED|B_FREE|B_ASYNC), svd->cred); VN_RELE(fvp); } else { /* * XXX - Should the loop terminate if * the page is `locked'? */ page_unlock(pp); } --vpp; --fanon_index; pgoff -= PAGESIZE; } } } plp = pl; *plp = NULL; pl_alloc_sz = 0; /* * See if we need to call VOP_GETPAGE for * *any* of the range being faulted on. * We can skip all of this work if there * was no original vnode. */ if (svd->vp != NULL) { u_offset_t vp_off; size_t vp_len; struct anon *ap; vnode_t *vp; vp_off = off; vp_len = len; if (amp == NULL) dogetpage = 1; else { /* * Only acquire reader lock to prevent amp->ahp * from being changed. It's ok to miss pages, * hence we don't do anon_array_enter */ ANON_LOCK_ENTER(&->a_rwlock, RW_READER); ap = anon_get_ptr(amp->ahp, anon_index); if (len <= PAGESIZE) /* inline non_anon() */ dogetpage = (ap == NULL); else dogetpage = non_anon(amp->ahp, anon_index, &vp_off, &vp_len); ANON_LOCK_EXIT(&->a_rwlock); } if (dogetpage) { enum seg_rw arw; struct as *as = seg->s_as; if (len > ptob((sizeof (pl) / sizeof (pl[0])) - 1)) { /* * Page list won't fit in local array, * allocate one of the needed size. */ pl_alloc_sz = (btop(len) + 1) * sizeof (page_t *); plp = kmem_alloc(pl_alloc_sz, KM_SLEEP); plp[0] = NULL; plsz = len; } else if (rw == S_WRITE && svd->type == MAP_PRIVATE || rw == S_OTHER || (((size_t)(addr + PAGESIZE) < (size_t)(seg->s_base + seg->s_size)) && hat_probe(as->a_hat, addr + PAGESIZE))) { /* * Ask VOP_GETPAGE to return the exact number * of pages if * (a) this is a COW fault, or * (b) this is a software fault, or * (c) next page is already mapped. */ plsz = len; } else { /* * Ask VOP_GETPAGE to return adjacent pages * within the segment. */ plsz = MIN((size_t)PVN_GETPAGE_SZ, (size_t) ((seg->s_base + seg->s_size) - addr)); ASSERT((addr + plsz) <= (seg->s_base + seg->s_size)); } /* * Need to get some non-anonymous pages. * We need to make only one call to GETPAGE to do * this to prevent certain deadlocking conditions * when we are doing locking. In this case * non_anon() should have picked up the smallest * range which includes all the non-anonymous * pages in the requested range. We have to * be careful regarding which rw flag to pass in * because on a private mapping, the underlying * object is never allowed to be written. */ if (rw == S_WRITE && svd->type == MAP_PRIVATE) { arw = S_READ; } else { arw = rw; } vp = svd->vp; TRACE_3(TR_FAC_VM, TR_SEGVN_GETPAGE, "segvn_getpage:seg %p addr %p vp %p", seg, addr, vp); err = VOP_GETPAGE(vp, (offset_t)vp_off, vp_len, &vpprot, plp, plsz, seg, addr + (vp_off - off), arw, svd->cred); if (err) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); segvn_pagelist_rele(plp); if (pl_alloc_sz) kmem_free(plp, pl_alloc_sz); return (FC_MAKE_ERR(err)); } if (svd->type == MAP_PRIVATE) vpprot &= ~PROT_WRITE; } } /* * N.B. at this time the plp array has all the needed non-anon * pages in addition to (possibly) having some adjacent pages. */ /* * Always acquire the anon_array_lock to prevent * 2 threads from allocating separate anon slots for * the same "addr". * * If this is a copy-on-write fault and we don't already * have the anon_array_lock, acquire it to prevent the * fault routine from handling multiple copy-on-write faults * on the same "addr" in the same address space. * * Only one thread should deal with the fault since after * it is handled, the other threads can acquire a translation * to the newly created private page. This prevents two or * more threads from creating different private pages for the * same fault. * * We grab "serialization" lock here if this is a MAP_PRIVATE segment * to prevent deadlock between this thread and another thread * which has soft-locked this page and wants to acquire serial_lock. * ( bug 4026339 ) * * The fix for bug 4026339 becomes unnecessary when using the * locking scheme with per amp rwlock and a global set of hash * lock, anon_array_lock. If we steal a vnode page when low * on memory and upgrad the page lock through page_rename, * then the page is PAGE_HANDLED, nothing needs to be done * for this page after returning from segvn_faultpage. * * But really, the page lock should be downgraded after * the stolen page is page_rename'd. */ if (amp != NULL) ANON_LOCK_ENTER(&->a_rwlock, RW_READER); /* * Ok, now loop over the address range and handle faults */ for (a = addr; a < addr + len; a += PAGESIZE, off += PAGESIZE) { err = segvn_faultpage(hat, seg, a, off, vpage, plp, vpprot, type, rw, brkcow); if (err) { if (amp != NULL) ANON_LOCK_EXIT(&->a_rwlock); if (type == F_SOFTLOCK && a > addr) segvn_softunlock(seg, addr, (a - addr), S_OTHER); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); segvn_pagelist_rele(plp); if (pl_alloc_sz) kmem_free(plp, pl_alloc_sz); return (err); } if (vpage) { vpage++; } else if (svd->vpage) { page = seg_page(seg, addr); vpage = &svd->vpage[++page]; } } /* Didn't get pages from the underlying fs so we're done */ if (!dogetpage) goto done; /* * Now handle any other pages in the list returned. * If the page can be used, load up the translations now. * Note that the for loop will only be entered if "plp" * is pointing to a non-NULL page pointer which means that * VOP_GETPAGE() was called and vpprot has been initialized. */ if (svd->pageprot == 0) prot = svd->prot & vpprot; /* * Large Files: diff should be unsigned value because we started * supporting > 2GB segment sizes from 2.5.1 and when a * large file of size > 2GB gets mapped to address space * the diff value can be > 2GB. */ for (ppp = plp; (pp = *ppp) != NULL; ppp++) { size_t diff; struct anon *ap; int anon_index; anon_sync_obj_t cookie; int hat_flag = HAT_LOAD_ADV; if (svd->flags & MAP_TEXT) { hat_flag |= HAT_LOAD_TEXT; } if (pp == PAGE_HANDLED) continue; if (pp->p_offset >= svd->offset && (pp->p_offset < svd->offset + seg->s_size)) { diff = pp->p_offset - svd->offset; /* * Large Files: Following is the assertion * validating the above cast. */ ASSERT(svd->vp == pp->p_vnode); page = btop(diff); if (svd->pageprot) prot = VPP_PROT(&svd->vpage[page]) & vpprot; /* * Prevent other threads in the address space from * creating private pages (i.e., allocating anon slots) * while we are in the process of loading translations * to additional pages returned by the underlying * object. */ if (amp != NULL) { anon_index = svd->anon_index + page; anon_array_enter(amp, anon_index, &cookie); ap = anon_get_ptr(amp->ahp, anon_index); } if ((amp == NULL) || (ap == NULL)) { if (IS_VMODSORT(pp->p_vnode) || enable_mbit_wa) { if (rw == S_WRITE) hat_setmod(pp); else if (rw != S_OTHER && !hat_ismod(pp)) prot &= ~PROT_WRITE; } /* * Skip mapping read ahead pages marked * for migration, so they will get migrated * properly on fault */ if ((prot & PROT_READ) && !PP_ISMIGRATE(pp)) { hat_memload(hat, seg->s_base + diff, pp, prot, hat_flag); } } if (amp != NULL) anon_array_exit(&cookie); } page_unlock(pp); } done: if (amp != NULL) ANON_LOCK_EXIT(&->a_rwlock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); if (pl_alloc_sz) kmem_free(plp, pl_alloc_sz); return (0); } /* * This routine is used to start I/O on pages asynchronously. XXX it will * only create PAGESIZE pages. At fault time they will be relocated into * larger pages. */ static faultcode_t segvn_faulta(struct seg *seg, caddr_t addr) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; int err; struct anon_map *amp; vnode_t *vp; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); if ((amp = svd->amp) != NULL) { struct anon *ap; /* * Reader lock to prevent amp->ahp from being changed. * This is advisory, it's ok to miss a page, so * we don't do anon_array_enter lock. */ ANON_LOCK_ENTER(&->a_rwlock, RW_READER); if ((ap = anon_get_ptr(amp->ahp, svd->anon_index + seg_page(seg, addr))) != NULL) { err = anon_getpage(&ap, NULL, NULL, 0, seg, addr, S_READ, svd->cred); ANON_LOCK_EXIT(&->a_rwlock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); if (err) return (FC_MAKE_ERR(err)); return (0); } ANON_LOCK_EXIT(&->a_rwlock); } if (svd->vp == NULL) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); /* zfod page - do nothing now */ } vp = svd->vp; TRACE_3(TR_FAC_VM, TR_SEGVN_GETPAGE, "segvn_getpage:seg %p addr %p vp %p", seg, addr, vp); err = VOP_GETPAGE(vp, (offset_t)(svd->offset + (uintptr_t)(addr - seg->s_base)), PAGESIZE, NULL, NULL, 0, seg, addr, S_OTHER, svd->cred); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); if (err) return (FC_MAKE_ERR(err)); return (0); } static int segvn_setprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vpage *svp, *evp; struct vnode *vp; size_t pgsz; pgcnt_t pgcnt; anon_sync_obj_t cookie; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); if ((svd->maxprot & prot) != prot) return (EACCES); /* violated maxprot */ SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER); /* return if prot is the same */ if (!svd->pageprot && svd->prot == prot) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } /* * Since we change protections we first have to flush the cache. * This makes sure all the pagelock calls have to recheck * protections. */ if (svd->softlockcnt > 0) { /* * Since we do have the segvn writers lock nobody can fill * the cache with entries belonging to this seg during * the purge. The flush either succeeds or we still have * pending I/Os. */ segvn_purge(seg); if (svd->softlockcnt > 0) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EAGAIN); } } if (seg->s_szc != 0) { int err; pgsz = page_get_pagesize(seg->s_szc); pgcnt = pgsz >> PAGESHIFT; ASSERT(IS_P2ALIGNED(pgcnt, pgcnt)); if (!IS_P2ALIGNED(addr, pgsz) || !IS_P2ALIGNED(len, pgsz)) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); ASSERT(seg->s_base != addr || seg->s_size != len); /* * If we are holding the as lock as a reader then * we need to return IE_RETRY and let the as * layer drop and re-aquire the lock as a writer. */ if (AS_READ_HELD(seg->s_as, &seg->s_as->a_lock)) return (IE_RETRY); VM_STAT_ADD(segvnvmstats.demoterange[1]); err = segvn_demote_range(seg, addr, len, SDR_END); if (err == 0) return (IE_RETRY); if (err == ENOMEM) return (IE_NOMEM); return (err); } } /* * If it's a private mapping and we're making it writable * and no swap space has been reserved, have to reserve * it all now. If it's a private mapping to a file (i.e., vp != NULL) * and we're removing write permission on the entire segment and * we haven't modified any pages, we can release the swap space. */ if (svd->type == MAP_PRIVATE) { if (prot & PROT_WRITE) { size_t sz; if (svd->swresv == 0 && !(svd->flags & MAP_NORESERVE)) { if (anon_resv(seg->s_size) == 0) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (IE_NOMEM); } sz = svd->swresv = seg->s_size; TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, sz, 1); } } else { /* * Swap space is released only if this segment * does not map anonymous memory, since read faults * on such segments still need an anon slot to read * in the data. */ if (svd->swresv != 0 && svd->vp != NULL && svd->amp == NULL && addr == seg->s_base && len == seg->s_size && svd->pageprot == 0) { anon_unresv(svd->swresv); svd->swresv = 0; TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u", seg, 0, 0); } } } if (addr == seg->s_base && len == seg->s_size && svd->pageprot == 0) { if (svd->prot == prot) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); /* all done */ } svd->prot = (uchar_t)prot; } else { struct anon *ap = NULL; page_t *pp; u_offset_t offset, off; struct anon_map *amp; ulong_t anon_idx = 0; /* * A vpage structure exists or else the change does not * involve the entire segment. Establish a vpage structure * if none is there. Then, for each page in the range, * adjust its individual permissions. Note that write- * enabling a MAP_PRIVATE page can affect the claims for * locked down memory. Overcommitting memory terminates * the operation. */ segvn_vpage(seg); if ((amp = svd->amp) != NULL) { anon_idx = svd->anon_index + seg_page(seg, addr); ASSERT(seg->s_szc == 0 || IS_P2ALIGNED(anon_idx, pgcnt)); ANON_LOCK_ENTER(&->a_rwlock, RW_READER); } offset = svd->offset + (uintptr_t)(addr - seg->s_base); evp = &svd->vpage[seg_page(seg, addr + len)]; /* * See Statement at the beginning of segvn_lockop regarding * the way cowcnts and lckcnts are handled. */ for (svp = &svd->vpage[seg_page(seg, addr)]; svp < evp; svp++) { ASSERT(seg->s_szc == 0 || (svd->vp != NULL || svd->type == MAP_PRIVATE)); if (seg->s_szc != 0 && svd->type == MAP_PRIVATE) { if (amp != NULL) { anon_array_enter(amp, anon_idx, &cookie); } if (IS_P2ALIGNED(anon_idx, pgcnt) && !segvn_claim_pages(seg, svp, offset, anon_idx, prot)) { if (amp != NULL) { anon_array_exit(&cookie); } break; } if (amp != NULL) { anon_array_exit(&cookie); } anon_idx++; } else { if (amp != NULL) { anon_array_enter(amp, anon_idx, &cookie); ap = anon_get_ptr(amp->ahp, anon_idx++); } if (VPP_ISPPLOCK(svp) && (VPP_PROT(svp) != prot) && (svd->type == MAP_PRIVATE)) { if (amp == NULL || ap == NULL) { vp = svd->vp; off = offset; } else swap_xlate(ap, &vp, &off); if (amp != NULL) anon_array_exit(&cookie); if ((pp = page_lookup(vp, off, SE_SHARED)) == NULL) { panic("segvn_setprot: no page"); /*NOTREACHED*/ } ASSERT(seg->s_szc == 0); if ((VPP_PROT(svp) ^ prot) & PROT_WRITE) { if (prot & PROT_WRITE) { if (!page_addclaim(pp)) { page_unlock(pp); break; } } else { if (!page_subclaim(pp)) { page_unlock(pp); break; } } } page_unlock(pp); } else if (amp != NULL) anon_array_exit(&cookie); } VPP_SETPROT(svp, prot); offset += PAGESIZE; } if (amp != NULL) ANON_LOCK_EXIT(&->a_rwlock); /* * Did we terminate prematurely? If so, simply unload * the translations to the things we've updated so far. */ if (svp != evp) { len = (svp - &svd->vpage[seg_page(seg, addr)]) * PAGESIZE; ASSERT(seg->s_szc == 0 || IS_P2ALIGNED(len, pgsz)); if (len != 0) hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (IE_NOMEM); } } if ((prot & PROT_WRITE) != 0 || (prot & ~PROT_USER) == PROT_NONE) { /* * Either private or shared data with write access (in * which case we need to throw out all former translations * so that we get the right translations set up on fault * and we don't allow write access to any copy-on-write pages * that might be around or to prevent write access to pages * representing holes in a file), or we don't have permission * to access the memory at all (in which case we have to * unload any current translations that might exist). */ hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD); } else { /* * A shared mapping or a private mapping in which write * protection is going to be denied - just change all the * protections over the range of addresses in question. * segvn does not support any other attributes other * than prot so we can use hat_chgattr. */ hat_chgattr(seg->s_as->a_hat, addr, len, prot); } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } /* * segvn_setpagesize is called via SEGOP_SETPAGESIZE from as_setpagesize, * to determine if the seg is capable of mapping the requested szc. */ static int segvn_setpagesize(struct seg *seg, caddr_t addr, size_t len, uint_t szc) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct segvn_data *nsvd; struct anon_map *amp = svd->amp; struct seg *nseg; caddr_t eaddr = addr + len, a; size_t pgsz = page_get_pagesize(szc); int err; u_offset_t off = svd->offset + (uintptr_t)(addr - seg->s_base); extern struct vnode kvp; ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); ASSERT(addr >= seg->s_base && eaddr <= seg->s_base + seg->s_size); if (seg->s_szc == szc || segvn_lpg_disable != 0) { return (0); } /* * addr should always be pgsz aligned but eaddr may be misaligned if * it's at the end of the segment. * * XXX we should assert this condition since as_setpagesize() logic * guarantees it. */ if (!IS_P2ALIGNED(addr, pgsz) || (!IS_P2ALIGNED(eaddr, pgsz) && eaddr != seg->s_base + seg->s_size)) { segvn_setpgsz_align_err++; return (EINVAL); } if ((svd->vp == NULL && svd->type == MAP_SHARED) || (svd->flags & MAP_NORESERVE) || seg->s_as == &kas || szc > segvn_maxpgszc) { return (EINVAL); } /* paranoid check */ if (svd->vp != NULL && (IS_SWAPFSVP(svd->vp) || svd->vp == &kvp)) { return (EINVAL); } if (seg->s_szc == 0 && svd->vp != NULL && map_addr_vacalign_check(addr, off)) { return (EINVAL); } /* * Check that protections are the same within new page * size boundaries. */ if (svd->pageprot) { for (a = addr; a < eaddr; a += pgsz) { if ((a + pgsz) > eaddr) { if (!sameprot(seg, a, eaddr - a)) { return (EINVAL); } } else { if (!sameprot(seg, a, pgsz)) { return (EINVAL); } } } } /* * Since we are changing page size we first have to flush * the cache. This makes sure all the pagelock calls have * to recheck protections. */ if (svd->softlockcnt > 0) { /* * Since we do have the segvn writers lock nobody can fill * the cache with entries belonging to this seg during * the purge. The flush either succeeds or we still have * pending I/Os. */ segvn_purge(seg); if (svd->softlockcnt > 0) { return (EAGAIN); } } /* * Operation for sub range of existing segment. */ if (addr != seg->s_base || eaddr != (seg->s_base + seg->s_size)) { if (szc < seg->s_szc) { VM_STAT_ADD(segvnvmstats.demoterange[2]); err = segvn_demote_range(seg, addr, len, SDR_RANGE); if (err == 0) { return (IE_RETRY); } if (err == ENOMEM) { return (IE_NOMEM); } return (err); } if (addr != seg->s_base) { nseg = segvn_split_seg(seg, addr); if (eaddr != (nseg->s_base + nseg->s_size)) { /* eaddr is szc aligned */ (void) segvn_split_seg(nseg, eaddr); } return (IE_RETRY); } if (eaddr != (seg->s_base + seg->s_size)) { /* eaddr is szc aligned */ (void) segvn_split_seg(seg, eaddr); } return (IE_RETRY); } /* * Break any low level sharing and reset seg->s_szc to 0. */ if ((err = segvn_clrszc(seg)) != 0) { if (err == ENOMEM) { err = IE_NOMEM; } return (err); } ASSERT(seg->s_szc == 0); /* * If the end of the current segment is not pgsz aligned * then attempt to concatenate with the next segment. */ if (!IS_P2ALIGNED(eaddr, pgsz)) { nseg = AS_SEGNEXT(seg->s_as, seg); if (nseg == NULL || nseg == seg || eaddr != nseg->s_base) { return (ENOMEM); } if (nseg->s_ops != &segvn_ops) { return (EINVAL); } nsvd = (struct segvn_data *)nseg->s_data; if (nsvd->softlockcnt > 0) { segvn_purge(nseg); if (nsvd->softlockcnt > 0) { return (EAGAIN); } } err = segvn_clrszc(nseg); if (err == ENOMEM) { err = IE_NOMEM; } if (err != 0) { return (err); } err = segvn_concat(seg, nseg, 1); if (err == -1) { return (EINVAL); } if (err == -2) { return (IE_NOMEM); } return (IE_RETRY); } /* * May need to re-align anon array to * new szc. */ if (amp != NULL) { pgcnt_t pgcnt = pgsz >> PAGESHIFT; if (!IS_P2ALIGNED(svd->anon_index, pgcnt)) { struct anon_hdr *nahp; ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); ASSERT(amp->refcnt == 1); nahp = anon_create(btop(amp->size), ANON_NOSLEEP); if (nahp == NULL) { ANON_LOCK_EXIT(&->a_rwlock); return (IE_NOMEM); } if (anon_copy_ptr(amp->ahp, svd->anon_index, nahp, 0, btop(seg->s_size), ANON_NOSLEEP)) { anon_release(nahp, btop(amp->size)); ANON_LOCK_EXIT(&->a_rwlock); return (IE_NOMEM); } anon_release(amp->ahp, btop(amp->size)); amp->ahp = nahp; svd->anon_index = 0; ANON_LOCK_EXIT(&->a_rwlock); } } if (svd->vp != NULL && szc != 0) { struct vattr va; u_offset_t eoffpage = svd->offset; va.va_mask = AT_SIZE; eoffpage += seg->s_size; eoffpage = btopr(eoffpage); if (VOP_GETATTR(svd->vp, &va, 0, svd->cred) != 0) { segvn_setpgsz_getattr_err++; return (EINVAL); } if (btopr(va.va_size) < eoffpage) { segvn_setpgsz_eof_err++; return (EINVAL); } if (amp != NULL) { /* * anon_fill_cow_holes() may call VOP_GETPAGE(). * don't take anon map lock here to avoid holding it * across VOP_GETPAGE() calls that may call back into * segvn for klsutering checks. We don't really need * anon map lock here since it's a private segment and * we hold as level lock as writers. */ if ((err = anon_fill_cow_holes(seg, seg->s_base, amp->ahp, svd->anon_index, svd->vp, svd->offset, seg->s_size, szc, svd->prot, svd->vpage, svd->cred)) != 0) { return (EINVAL); } } segvn_setvnode_mpss(svd->vp); } if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); amp->a_szc = szc; ANON_LOCK_EXIT(&->a_rwlock); } seg->s_szc = szc; return (0); } static int segvn_clrszc(struct seg *seg) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon_map *amp = svd->amp; size_t pgsz; pgcnt_t pages; int err = 0; caddr_t a = seg->s_base; caddr_t ea = a + seg->s_size; ulong_t an_idx = svd->anon_index; vnode_t *vp = svd->vp; struct vpage *vpage = svd->vpage; page_t *anon_pl[1 + 1], *pp; struct anon *ap, *oldap; uint_t prot = svd->prot, vpprot; ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock) || SEGVN_WRITE_HELD(seg->s_as, &svd->lock)); ASSERT(svd->type == MAP_PRIVATE || (vp != NULL && svd->amp == NULL)); if (vp == NULL && amp == NULL) { seg->s_szc = 0; return (0); } /* * do HAT_UNLOAD_UNMAP since we are changing the pagesize. * unload argument is 0 when we are freeing the segment * and unload was already done. */ hat_unload(seg->s_as->a_hat, seg->s_base, seg->s_size, HAT_UNLOAD_UNMAP); if (amp == NULL) { seg->s_szc = 0; return (0); } pgsz = page_get_pagesize(seg->s_szc); pages = btop(pgsz); /* * XXX anon rwlock is not really needed because this is a * private segment and we are writers. */ ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER); for (; a < ea; a += pgsz, an_idx += pages) { if ((oldap = anon_get_ptr(amp->ahp, an_idx)) != NULL) { if (svd->pageprot != 0) { ASSERT(vpage != NULL); prot = VPP_PROT(vpage); ASSERT(sameprot(seg, a, pgsz)); } if (seg->s_szc != 0) { ASSERT(vp == NULL || anon_pages(amp->ahp, an_idx, pages) == pages); if ((err = anon_map_demotepages(amp, an_idx, seg, a, prot, vpage, svd->cred)) != 0) { goto out; } } else { if (oldap->an_refcnt == 1) { continue; } if ((err = anon_getpage(&oldap, &vpprot, anon_pl, PAGESIZE, seg, a, S_READ, svd->cred))) { goto out; } if ((pp = anon_private(&ap, seg, a, prot, anon_pl[0], 0, svd->cred)) == NULL) { err = ENOMEM; goto out; } anon_decref(oldap); (void) anon_set_ptr(amp->ahp, an_idx, ap, ANON_SLEEP); page_unlock(pp); } } vpage = (vpage == NULL) ? NULL : vpage + pages; } amp->a_szc = 0; seg->s_szc = 0; out: ANON_LOCK_EXIT(&->a_rwlock); return (err); } static int segvn_claim_pages( struct seg *seg, struct vpage *svp, u_offset_t off, ulong_t anon_idx, uint_t prot) { pgcnt_t pgcnt = page_get_pagecnt(seg->s_szc); size_t ppasize = (pgcnt + 1) * sizeof (page_t *); page_t **ppa; struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon_map *amp = svd->amp; struct vpage *evp = svp + pgcnt; caddr_t addr = ((uintptr_t)(svp - svd->vpage) << PAGESHIFT) + seg->s_base; struct anon *ap; struct vnode *vp = svd->vp; page_t *pp; pgcnt_t pg_idx, i; int err = 0; anoff_t aoff; int anon = (amp != NULL) ? 1 : 0; ASSERT(svd->type == MAP_PRIVATE); ASSERT(svd->vpage != NULL); ASSERT(seg->s_szc != 0); ASSERT(IS_P2ALIGNED(pgcnt, pgcnt)); ASSERT(amp == NULL || IS_P2ALIGNED(anon_idx, pgcnt)); ASSERT(sameprot(seg, addr, pgcnt << PAGESHIFT)); if (VPP_PROT(svp) == prot) return (1); if (!((VPP_PROT(svp) ^ prot) & PROT_WRITE)) return (1); ppa = kmem_alloc(ppasize, KM_SLEEP); if (anon && vp != NULL) { if (anon_get_ptr(amp->ahp, anon_idx) == NULL) { anon = 0; ASSERT(!anon_pages(amp->ahp, anon_idx, pgcnt)); } ASSERT(!anon || anon_pages(amp->ahp, anon_idx, pgcnt) == pgcnt); } for (*ppa = NULL, pg_idx = 0; svp < evp; svp++, anon_idx++) { if (!VPP_ISPPLOCK(svp)) continue; if (anon) { ap = anon_get_ptr(amp->ahp, anon_idx); if (ap == NULL) { panic("segvn_claim_pages: no anon slot"); } swap_xlate(ap, &vp, &aoff); off = (u_offset_t)aoff; } ASSERT(vp != NULL); if ((pp = page_lookup(vp, (u_offset_t)off, SE_SHARED)) == NULL) { panic("segvn_claim_pages: no page"); } ppa[pg_idx++] = pp; off += PAGESIZE; } if (ppa[0] == NULL) { kmem_free(ppa, ppasize); return (1); } ASSERT(pg_idx <= pgcnt); ppa[pg_idx] = NULL; if (prot & PROT_WRITE) err = page_addclaim_pages(ppa); else err = page_subclaim_pages(ppa); for (i = 0; i < pg_idx; i++) { ASSERT(ppa[i] != NULL); page_unlock(ppa[i]); } kmem_free(ppa, ppasize); return (err); } /* * Returns right (upper address) segment if split occured. * If the address is equal to the beginning or end of its segment it returns * the current segment. */ static struct seg * segvn_split_seg(struct seg *seg, caddr_t addr) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct seg *nseg; size_t nsize; struct segvn_data *nsvd; ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); ASSERT(svd->type == MAP_PRIVATE || svd->amp == NULL); ASSERT(addr >= seg->s_base); ASSERT(addr <= seg->s_base + seg->s_size); if (addr == seg->s_base || addr == seg->s_base + seg->s_size) return (seg); nsize = seg->s_base + seg->s_size - addr; seg->s_size = addr - seg->s_base; nseg = seg_alloc(seg->s_as, addr, nsize); ASSERT(nseg != NULL); nseg->s_ops = seg->s_ops; nsvd = kmem_cache_alloc(segvn_cache, KM_SLEEP); nseg->s_data = (void *)nsvd; nseg->s_szc = seg->s_szc; *nsvd = *svd; rw_init(&nsvd->lock, NULL, RW_DEFAULT, NULL); if (nsvd->vp != NULL) { VN_HOLD(nsvd->vp); nsvd->offset = svd->offset + (uintptr_t)(nseg->s_base - seg->s_base); if (nsvd->type == MAP_SHARED) lgrp_shm_policy_init(NULL, nsvd->vp); } else { /* * The offset for an anonymous segment has no signifigance in * terms of an offset into a file. If we were to use the above * calculation instead, the structures read out of * /proc//xmap would be more difficult to decipher since * it would be unclear whether two seemingly contiguous * prxmap_t structures represented different segments or a * single segment that had been split up into multiple prxmap_t * structures (e.g. if some part of the segment had not yet * been faulted in). */ nsvd->offset = 0; } ASSERT(svd->softlockcnt == 0); crhold(svd->cred); if (svd->vpage != NULL) { size_t bytes = vpgtob(seg_pages(seg)); size_t nbytes = vpgtob(seg_pages(nseg)); struct vpage *ovpage = svd->vpage; svd->vpage = kmem_alloc(bytes, KM_SLEEP); bcopy(ovpage, svd->vpage, bytes); nsvd->vpage = kmem_alloc(nbytes, KM_SLEEP); bcopy(ovpage + seg_pages(seg), nsvd->vpage, nbytes); kmem_free(ovpage, bytes + nbytes); } if (svd->amp != NULL) { struct anon_map *oamp = svd->amp, *namp; struct anon_hdr *nahp; ANON_LOCK_ENTER(&oamp->a_rwlock, RW_WRITER); ASSERT(oamp->refcnt == 1); nahp = anon_create(btop(seg->s_size), ANON_SLEEP); (void) anon_copy_ptr(oamp->ahp, svd->anon_index, nahp, 0, btop(seg->s_size), ANON_SLEEP); namp = anonmap_alloc(nseg->s_size, 0); namp->a_szc = nseg->s_szc; (void) anon_copy_ptr(oamp->ahp, svd->anon_index + btop(seg->s_size), namp->ahp, 0, btop(nseg->s_size), ANON_SLEEP); anon_release(oamp->ahp, btop(oamp->size)); oamp->ahp = nahp; oamp->size = seg->s_size; svd->anon_index = 0; nsvd->amp = namp; nsvd->anon_index = 0; ANON_LOCK_EXIT(&oamp->a_rwlock); } /* * Split amount of swap reserve */ if (svd->swresv) { /* * For MAP_NORESERVE, only allocate swap reserve for pages * being used. Other segments get enough to cover whole * segment. */ if (svd->flags & MAP_NORESERVE) { size_t oswresv; ASSERT(svd->amp); oswresv = svd->swresv; svd->swresv = ptob(anon_pages(svd->amp->ahp, svd->anon_index, btop(seg->s_size))); nsvd->swresv = ptob(anon_pages(nsvd->amp->ahp, nsvd->anon_index, btop(nseg->s_size))); ASSERT(oswresv >= (svd->swresv + nsvd->swresv)); } else { ASSERT(svd->swresv == seg->s_size + nseg->s_size); svd->swresv = seg->s_size; nsvd->swresv = nseg->s_size; } } return (nseg); } /* * called on memory operations (unmap, setprot, setpagesize) for a subset * of a large page segment to either demote the memory range (SDR_RANGE) * or the ends (SDR_END) by addr/len. * * returns 0 on success. returns errno, including ENOMEM, on failure. */ static int segvn_demote_range(struct seg *seg, caddr_t addr, size_t len, int flag) { caddr_t eaddr = addr + len; caddr_t lpgaddr, lpgeaddr; struct seg *nseg; struct seg *badseg1 = NULL; struct seg *badseg2 = NULL; size_t pgsz; struct segvn_data *svd = (struct segvn_data *)seg->s_data; int err; ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock)); ASSERT(seg->s_szc != 0); pgsz = page_get_pagesize(seg->s_szc); ASSERT(seg->s_base != addr || seg->s_size != len); ASSERT(addr >= seg->s_base && eaddr <= seg->s_base + seg->s_size); ASSERT(svd->softlockcnt == 0); ASSERT(svd->type == MAP_PRIVATE || (svd->vp != NULL && svd->amp == NULL)); CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr); ASSERT(flag == SDR_RANGE || eaddr < lpgeaddr || addr > lpgaddr); if (flag == SDR_RANGE) { /* demote entire range */ badseg1 = nseg = segvn_split_seg(seg, lpgaddr); (void) segvn_split_seg(nseg, lpgeaddr); ASSERT(badseg1->s_base == lpgaddr); ASSERT(badseg1->s_size == lpgeaddr - lpgaddr); } else if (addr != lpgaddr) { ASSERT(flag == SDR_END); badseg1 = nseg = segvn_split_seg(seg, lpgaddr); if (eaddr != lpgeaddr && eaddr > lpgaddr + pgsz && eaddr < lpgaddr + 2 * pgsz) { (void) segvn_split_seg(nseg, lpgeaddr); ASSERT(badseg1->s_base == lpgaddr); ASSERT(badseg1->s_size == 2 * pgsz); } else { nseg = segvn_split_seg(nseg, lpgaddr + pgsz); ASSERT(badseg1->s_base == lpgaddr); ASSERT(badseg1->s_size == pgsz); if (eaddr != lpgeaddr && eaddr > lpgaddr + pgsz) { ASSERT(lpgeaddr - lpgaddr > 2 * pgsz); nseg = segvn_split_seg(nseg, lpgeaddr - pgsz); badseg2 = nseg; (void) segvn_split_seg(nseg, lpgeaddr); ASSERT(badseg2->s_base == lpgeaddr - pgsz); ASSERT(badseg2->s_size == pgsz); } } } else { ASSERT(flag == SDR_END); ASSERT(eaddr < lpgeaddr); badseg1 = nseg = segvn_split_seg(seg, lpgeaddr - pgsz); (void) segvn_split_seg(nseg, lpgeaddr); ASSERT(badseg1->s_base == lpgeaddr - pgsz); ASSERT(badseg1->s_size == pgsz); } ASSERT(badseg1 != NULL); ASSERT(badseg1->s_szc != 0); ASSERT(page_get_pagesize(badseg1->s_szc) == pgsz); ASSERT(flag == SDR_RANGE || badseg1->s_size == pgsz || badseg1->s_size == 2 * pgsz); if (err = segvn_clrszc(badseg1)) { return (err); } ASSERT(badseg1->s_szc == 0); if (badseg2 == NULL) return (0); ASSERT(badseg2->s_szc != 0); ASSERT(page_get_pagesize(badseg2->s_szc) == pgsz); ASSERT(badseg2->s_size == pgsz); ASSERT(sameprot(badseg2, badseg2->s_base, badseg2->s_size)); if (err = segvn_clrszc(badseg2)) { return (err); } ASSERT(badseg2->s_szc == 0); return (0); } static int segvn_checkprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vpage *vp, *evp; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); /* * If segment protection can be used, simply check against them. */ if (svd->pageprot == 0) { int err; err = ((svd->prot & prot) != prot) ? EACCES : 0; SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (err); } /* * Have to check down to the vpage level. */ evp = &svd->vpage[seg_page(seg, addr + len)]; for (vp = &svd->vpage[seg_page(seg, addr)]; vp < evp; vp++) { if ((VPP_PROT(vp) & prot) != prot) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EACCES); } } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } static int segvn_getprot(struct seg *seg, caddr_t addr, size_t len, uint_t *protv) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; size_t pgno = seg_page(seg, addr + len) - seg_page(seg, addr) + 1; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); if (pgno != 0) { SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); if (svd->pageprot == 0) { do protv[--pgno] = svd->prot; while (pgno != 0); } else { size_t pgoff = seg_page(seg, addr); do { pgno--; protv[pgno] = VPP_PROT(&svd->vpage[pgno+pgoff]); } while (pgno != 0); } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); } return (0); } static u_offset_t segvn_getoffset(struct seg *seg, caddr_t addr) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); return (svd->offset + (uintptr_t)(addr - seg->s_base)); } /*ARGSUSED*/ static int segvn_gettype(struct seg *seg, caddr_t addr) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); return (svd->type | (svd->flags & MAP_NORESERVE)); } /*ARGSUSED*/ static int segvn_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); *vpp = svd->vp; return (0); } /* * Check to see if it makes sense to do kluster/read ahead to * addr + delta relative to the mapping at addr. We assume here * that delta is a signed PAGESIZE'd multiple (which can be negative). * * For segvn, we currently "approve" of the action if we are * still in the segment and it maps from the same vp/off, * or if the advice stored in segvn_data or vpages allows it. * Currently, klustering is not allowed only if MADV_RANDOM is set. */ static int segvn_kluster(struct seg *seg, caddr_t addr, ssize_t delta) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon *oap, *ap; ssize_t pd; size_t page; struct vnode *vp1, *vp2; u_offset_t off1, off2; struct anon_map *amp; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock) || SEGVN_LOCK_HELD(seg->s_as, &svd->lock)); if (addr + delta < seg->s_base || addr + delta >= (seg->s_base + seg->s_size)) return (-1); /* exceeded segment bounds */ pd = delta / (ssize_t)PAGESIZE; /* divide to preserve sign bit */ page = seg_page(seg, addr); /* * Check to see if either of the pages addr or addr + delta * have advice set that prevents klustering (if MADV_RANDOM advice * is set for entire segment, or MADV_SEQUENTIAL is set and delta * is negative). */ if (svd->advice == MADV_RANDOM || svd->advice == MADV_SEQUENTIAL && delta < 0) return (-1); else if (svd->pageadvice && svd->vpage) { struct vpage *bvpp, *evpp; bvpp = &svd->vpage[page]; evpp = &svd->vpage[page + pd]; if (VPP_ADVICE(bvpp) == MADV_RANDOM || VPP_ADVICE(evpp) == MADV_SEQUENTIAL && delta < 0) return (-1); if (VPP_ADVICE(bvpp) != VPP_ADVICE(evpp) && VPP_ADVICE(evpp) == MADV_RANDOM) return (-1); } if (svd->type == MAP_SHARED) return (0); /* shared mapping - all ok */ if ((amp = svd->amp) == NULL) return (0); /* off original vnode */ page += svd->anon_index; ANON_LOCK_ENTER(&->a_rwlock, RW_READER); oap = anon_get_ptr(amp->ahp, page); ap = anon_get_ptr(amp->ahp, page + pd); ANON_LOCK_EXIT(&->a_rwlock); if ((oap == NULL && ap != NULL) || (oap != NULL && ap == NULL)) { return (-1); /* one with and one without an anon */ } if (oap == NULL) { /* implies that ap == NULL */ return (0); /* off original vnode */ } /* * Now we know we have two anon pointers - check to * see if they happen to be properly allocated. */ /* * XXX We cheat here and don't lock the anon slots. We can't because * we may have been called from the anon layer which might already * have locked them. We are holding a refcnt on the slots so they * can't disappear. The worst that will happen is we'll get the wrong * names (vp, off) for the slots and make a poor klustering decision. */ swap_xlate(ap, &vp1, &off1); swap_xlate(oap, &vp2, &off2); if (!VOP_CMP(vp1, vp2) || off1 - off2 != delta) return (-1); return (0); } /* * Swap the pages of seg out to secondary storage, returning the * number of bytes of storage freed. * * The basic idea is first to unload all translations and then to call * VOP_PUTPAGE() for all newly-unmapped pages, to push them out to the * swap device. Pages to which other segments have mappings will remain * mapped and won't be swapped. Our caller (as_swapout) has already * performed the unloading step. * * The value returned is intended to correlate well with the process's * memory requirements. However, there are some caveats: * 1) When given a shared segment as argument, this routine will * only succeed in swapping out pages for the last sharer of the * segment. (Previous callers will only have decremented mapping * reference counts.) * 2) We assume that the hat layer maintains a large enough translation * cache to capture process reference patterns. */ static size_t segvn_swapout(struct seg *seg) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon_map *amp; pgcnt_t pgcnt = 0; pgcnt_t npages; pgcnt_t page; ulong_t anon_index; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); /* * Find pages unmapped by our caller and force them * out to the virtual swap device. */ if ((amp = svd->amp) != NULL) anon_index = svd->anon_index; npages = seg->s_size >> PAGESHIFT; for (page = 0; page < npages; page++) { page_t *pp; struct anon *ap; struct vnode *vp; u_offset_t off; anon_sync_obj_t cookie; /* * Obtain pair for the page, then look it up. * * Note that this code is willing to consider regular * pages as well as anon pages. Is this appropriate here? */ ap = NULL; if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_READER); if (anon_array_try_enter(amp, anon_index + page, &cookie)) { ANON_LOCK_EXIT(&->a_rwlock); continue; } ap = anon_get_ptr(amp->ahp, anon_index + page); if (ap != NULL) { swap_xlate(ap, &vp, &off); } else { vp = svd->vp; off = svd->offset + ptob(page); } anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); } else { vp = svd->vp; off = svd->offset + ptob(page); } if (vp == NULL) { /* untouched zfod page */ ASSERT(ap == NULL); continue; } pp = page_lookup_nowait(vp, off, SE_SHARED); if (pp == NULL) continue; /* * Examine the page to see whether it can be tossed out, * keeping track of how many we've found. */ if (!page_tryupgrade(pp)) { /* * If the page has an i/o lock and no mappings, * it's very likely that the page is being * written out as a result of klustering. * Assume this is so and take credit for it here. */ if (!page_io_trylock(pp)) { if (!hat_page_is_mapped(pp)) pgcnt++; } else { page_io_unlock(pp); } page_unlock(pp); continue; } ASSERT(!page_iolock_assert(pp)); /* * Skip if page is locked or has mappings. * We don't need the page_struct_lock to look at lckcnt * and cowcnt because the page is exclusive locked. */ if (pp->p_lckcnt != 0 || pp->p_cowcnt != 0 || hat_page_is_mapped(pp)) { page_unlock(pp); continue; } /* * dispose skips large pages so try to demote first. */ if (pp->p_szc != 0 && !page_try_demote_pages(pp)) { page_unlock(pp); /* * XXX should skip the remaining page_t's of this * large page. */ continue; } ASSERT(pp->p_szc == 0); /* * No longer mapped -- we can toss it out. How * we do so depends on whether or not it's dirty. */ if (hat_ismod(pp) && pp->p_vnode) { /* * We must clean the page before it can be * freed. Setting B_FREE will cause pvn_done * to free the page when the i/o completes. * XXX: This also causes it to be accounted * as a pageout instead of a swap: need * B_SWAPOUT bit to use instead of B_FREE. * * Hold the vnode before releasing the page lock * to prevent it from being freed and re-used by * some other thread. */ VN_HOLD(vp); page_unlock(pp); /* * Queue all i/o requests for the pageout thread * to avoid saturating the pageout devices. */ if (!queue_io_request(vp, off)) VN_RELE(vp); } else { /* * The page was clean, free it. * * XXX: Can we ever encounter modified pages * with no associated vnode here? */ ASSERT(pp->p_vnode != NULL); /*LINTED: constant in conditional context*/ VN_DISPOSE(pp, B_FREE, 0, kcred); } /* * Credit now even if i/o is in progress. */ pgcnt++; } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); /* * Wakeup pageout to initiate i/o on all queued requests. */ cv_signal_pageout(); return (ptob(pgcnt)); } /* * Synchronize primary storage cache with real object in virtual memory. * * XXX - Anonymous pages should not be sync'ed out at all. */ static int segvn_sync(struct seg *seg, caddr_t addr, size_t len, int attr, uint_t flags) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vpage *vpp; page_t *pp; u_offset_t offset; struct vnode *vp; u_offset_t off; caddr_t eaddr; int bflags; int err = 0; int segtype; int pageprot; int prot; ulong_t anon_index; struct anon_map *amp; struct anon *ap; anon_sync_obj_t cookie; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); if (svd->softlockcnt > 0) { /* * flush all pages from seg cache * otherwise we may deadlock in swap_putpage * for B_INVAL page (4175402). * * Even if we grab segvn WRITER's lock or segp_slock * here, there might be another thread which could've * successfully performed lookup/insert just before * we acquired the lock here. So, grabbing either * lock here is of not much use. Until we devise * a strategy at upper layers to solve the * synchronization issues completely, we expect * applications to handle this appropriately. */ segvn_purge(seg); if (svd->softlockcnt > 0) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EAGAIN); } } vpp = svd->vpage; offset = svd->offset + (uintptr_t)(addr - seg->s_base); bflags = ((flags & MS_ASYNC) ? B_ASYNC : 0) | ((flags & MS_INVALIDATE) ? B_INVAL : 0); if (attr) { pageprot = attr & ~(SHARED|PRIVATE); segtype = (attr & SHARED) ? MAP_SHARED : MAP_PRIVATE; /* * We are done if the segment types don't match * or if we have segment level protections and * they don't match. */ if (svd->type != segtype) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } if (vpp == NULL) { if (svd->prot != pageprot) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } prot = svd->prot; } else vpp = &svd->vpage[seg_page(seg, addr)]; } else if (svd->vp && svd->amp == NULL && (flags & MS_INVALIDATE) == 0) { /* * No attributes, no anonymous pages and MS_INVALIDATE flag * is not on, just use one big request. */ err = VOP_PUTPAGE(svd->vp, (offset_t)offset, len, bflags, svd->cred); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (err); } if ((amp = svd->amp) != NULL) anon_index = svd->anon_index + seg_page(seg, addr); for (eaddr = addr + len; addr < eaddr; addr += PAGESIZE) { ap = NULL; if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_array_enter(amp, anon_index, &cookie); ap = anon_get_ptr(amp->ahp, anon_index++); if (ap != NULL) { swap_xlate(ap, &vp, &off); } else { vp = svd->vp; off = offset; } anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); } else { vp = svd->vp; off = offset; } offset += PAGESIZE; if (vp == NULL) /* untouched zfod page */ continue; if (attr) { if (vpp) { prot = VPP_PROT(vpp); vpp++; } if (prot != pageprot) { continue; } } /* * See if any of these pages are locked -- if so, then we * will have to truncate an invalidate request at the first * locked one. We don't need the page_struct_lock to test * as this is only advisory; even if we acquire it someone * might race in and lock the page after we unlock and before * we do the PUTPAGE, then PUTPAGE simply does nothing. */ if (flags & MS_INVALIDATE) { if ((pp = page_lookup(vp, off, SE_SHARED)) != NULL) { if (pp->p_lckcnt != 0 || pp->p_cowcnt != 0) { page_unlock(pp); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EBUSY); } if (ap != NULL && pp->p_szc != 0 && page_tryupgrade(pp)) { if (pp->p_lckcnt == 0 && pp->p_cowcnt == 0) { /* * swapfs VN_DISPOSE() won't * invalidate large pages. * Attempt to demote. * XXX can't help it if it * fails. But for swapfs * pages it is no big deal. */ (void) page_try_demote_pages( pp); } } page_unlock(pp); } } else if (svd->type == MAP_SHARED && amp != NULL) { /* * Avoid writting out to disk ISM's large pages * because segspt_free_pages() relies on NULL an_pvp * of anon slots of such pages. */ ASSERT(svd->vp == NULL); /* * swapfs uses page_lookup_nowait if not freeing or * invalidating and skips a page if * page_lookup_nowait returns NULL. */ pp = page_lookup_nowait(vp, off, SE_SHARED); if (pp == NULL) { continue; } if (pp->p_szc != 0) { page_unlock(pp); continue; } /* * Note ISM pages are created large so (vp, off)'s * page cannot suddenly become large after we unlock * pp. */ page_unlock(pp); } /* * XXX - Should ultimately try to kluster * calls to VOP_PUTPAGE() for performance. */ VN_HOLD(vp); err = VOP_PUTPAGE(vp, (offset_t)off, PAGESIZE, bflags, svd->cred); VN_RELE(vp); if (err) break; } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (err); } /* * Determine if we have data corresponding to pages in the * primary storage virtual memory cache (i.e., "in core"). */ static size_t segvn_incore(struct seg *seg, caddr_t addr, size_t len, char *vec) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vnode *vp, *avp; u_offset_t offset, aoffset; size_t p, ep; int ret; struct vpage *vpp; page_t *pp; uint_t start; struct anon_map *amp; /* XXX - for locknest */ struct anon *ap; uint_t attr; anon_sync_obj_t cookie; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); if (svd->amp == NULL && svd->vp == NULL) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); bzero(vec, btopr(len)); return (len); /* no anonymous pages created yet */ } p = seg_page(seg, addr); ep = seg_page(seg, addr + len); start = svd->vp ? SEG_PAGE_VNODEBACKED : 0; amp = svd->amp; for (; p < ep; p++, addr += PAGESIZE) { vpp = (svd->vpage) ? &svd->vpage[p]: NULL; ret = start; ap = NULL; avp = NULL; /* Grab the vnode/offset for the anon slot */ if (amp != NULL) { ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_array_enter(amp, svd->anon_index + p, &cookie); ap = anon_get_ptr(amp->ahp, svd->anon_index + p); if (ap != NULL) { swap_xlate(ap, &avp, &aoffset); } anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); } if ((avp != NULL) && page_exists(avp, aoffset)) { /* A page exists for the anon slot */ ret |= SEG_PAGE_INCORE; /* * If page is mapped and writable */ attr = (uint_t)0; if ((hat_getattr(seg->s_as->a_hat, addr, &attr) != -1) && (attr & PROT_WRITE)) { ret |= SEG_PAGE_ANON; } /* * Don't get page_struct lock for lckcnt and cowcnt, * since this is purely advisory. */ if ((pp = page_lookup_nowait(avp, aoffset, SE_SHARED)) != NULL) { if (pp->p_lckcnt) ret |= SEG_PAGE_SOFTLOCK; if (pp->p_cowcnt) ret |= SEG_PAGE_HASCOW; page_unlock(pp); } } /* Gather vnode statistics */ vp = svd->vp; offset = svd->offset + (uintptr_t)(addr - seg->s_base); if (vp != NULL) { /* * Try to obtain a "shared" lock on the page * without blocking. If this fails, determine * if the page is in memory. */ pp = page_lookup_nowait(vp, offset, SE_SHARED); if ((pp == NULL) && (page_exists(vp, offset))) { /* Page is incore, and is named */ ret |= (SEG_PAGE_INCORE | SEG_PAGE_VNODE); } /* * Don't get page_struct lock for lckcnt and cowcnt, * since this is purely advisory. */ if (pp != NULL) { ret |= (SEG_PAGE_INCORE | SEG_PAGE_VNODE); if (pp->p_lckcnt) ret |= SEG_PAGE_SOFTLOCK; if (pp->p_cowcnt) ret |= SEG_PAGE_HASCOW; page_unlock(pp); } } /* Gather virtual page information */ if (vpp) { if (VPP_ISPPLOCK(vpp)) ret |= SEG_PAGE_LOCKED; vpp++; } *vec++ = (char)ret; } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (len); } /* * Statement for p_cowcnts/p_lckcnts. * * p_cowcnt is updated while mlock/munlocking MAP_PRIVATE and PROT_WRITE region * irrespective of the following factors or anything else: * * (1) anon slots are populated or not * (2) cow is broken or not * (3) refcnt on ap is 1 or greater than 1 * * If it's not MAP_PRIVATE and PROT_WRITE, p_lckcnt is updated during mlock * and munlock. * * * Handling p_cowcnts/p_lckcnts during copy-on-write fault: * * if vpage has PROT_WRITE * transfer cowcnt on the oldpage -> cowcnt on the newpage * else * transfer lckcnt on the oldpage -> lckcnt on the newpage * * During copy-on-write, decrement p_cowcnt on the oldpage and increment * p_cowcnt on the newpage *if* the corresponding vpage has PROT_WRITE. * * We may also break COW if softlocking on read access in the physio case. * In this case, vpage may not have PROT_WRITE. So, we need to decrement * p_lckcnt on the oldpage and increment p_lckcnt on the newpage *if* the * vpage doesn't have PROT_WRITE. * * * Handling p_cowcnts/p_lckcnts during mprotect on mlocked region: * * If a MAP_PRIVATE region loses PROT_WRITE, we decrement p_cowcnt and * increment p_lckcnt by calling page_subclaim() which takes care of * availrmem accounting and p_lckcnt overflow. * * If a MAP_PRIVATE region gains PROT_WRITE, we decrement p_lckcnt and * increment p_cowcnt by calling page_addclaim() which takes care of * availrmem availability and p_cowcnt overflow. */ /* * Lock down (or unlock) pages mapped by this segment. * * XXX only creates PAGESIZE pages if anon slots are not initialized. * At fault time they will be relocated into larger pages. */ static int segvn_lockop(struct seg *seg, caddr_t addr, size_t len, int attr, int op, ulong_t *lockmap, size_t pos) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vpage *vpp; struct vpage *evp; page_t *pp; u_offset_t offset; u_offset_t off; int segtype; int pageprot; int claim; struct vnode *vp; ulong_t anon_index; struct anon_map *amp; struct anon *ap; struct vattr va; anon_sync_obj_t cookie; /* * Hold write lock on address space because may split or concatenate * segments */ ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER); if (attr) { pageprot = attr & ~(SHARED|PRIVATE); segtype = attr & SHARED ? MAP_SHARED : MAP_PRIVATE; /* * We are done if the segment types don't match * or if we have segment level protections and * they don't match. */ if (svd->type != segtype) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } if (svd->pageprot == 0 && svd->prot != pageprot) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } } /* * If we're locking, then we must create a vpage structure if * none exists. If we're unlocking, then check to see if there * is a vpage -- if not, then we could not have locked anything. */ if ((vpp = svd->vpage) == NULL) { if (op == MC_LOCK) segvn_vpage(seg); else { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } } /* * The anonymous data vector (i.e., previously * unreferenced mapping to swap space) can be allocated * by lazily testing for its existence. */ if (op == MC_LOCK && svd->amp == NULL && svd->vp == NULL) { svd->amp = anonmap_alloc(seg->s_size, 0); svd->amp->a_szc = seg->s_szc; } if ((amp = svd->amp) != NULL) { anon_index = svd->anon_index + seg_page(seg, addr); } offset = svd->offset + (uintptr_t)(addr - seg->s_base); evp = &svd->vpage[seg_page(seg, addr + len)]; /* * Loop over all pages in the range. Process if we're locking and * page has not already been locked in this mapping; or if we're * unlocking and the page has been locked. */ for (vpp = &svd->vpage[seg_page(seg, addr)]; vpp < evp; vpp++, pos++, addr += PAGESIZE, offset += PAGESIZE, anon_index++) { if ((attr == 0 || VPP_PROT(vpp) == pageprot) && ((op == MC_LOCK && !VPP_ISPPLOCK(vpp)) || (op == MC_UNLOCK && VPP_ISPPLOCK(vpp)))) { if (amp != NULL) ANON_LOCK_ENTER(&->a_rwlock, RW_READER); /* * If this isn't a MAP_NORESERVE segment and * we're locking, allocate anon slots if they * don't exist. The page is brought in later on. */ if (op == MC_LOCK && svd->vp == NULL && ((svd->flags & MAP_NORESERVE) == 0) && amp != NULL && ((ap = anon_get_ptr(amp->ahp, anon_index)) == NULL)) { anon_array_enter(amp, anon_index, &cookie); if ((ap = anon_get_ptr(amp->ahp, anon_index)) == NULL) { pp = anon_zero(seg, addr, &ap, svd->cred); if (pp == NULL) { anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (ENOMEM); } ASSERT(anon_get_ptr(amp->ahp, anon_index) == NULL); (void) anon_set_ptr(amp->ahp, anon_index, ap, ANON_SLEEP); page_unlock(pp); } anon_array_exit(&cookie); } /* * Get name for page, accounting for * existence of private copy. */ ap = NULL; if (amp != NULL) { anon_array_enter(amp, anon_index, &cookie); ap = anon_get_ptr(amp->ahp, anon_index); if (ap != NULL) { swap_xlate(ap, &vp, &off); } else { if (svd->vp == NULL && (svd->flags & MAP_NORESERVE)) { anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); continue; } vp = svd->vp; off = offset; } anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); } else { vp = svd->vp; off = offset; } /* * Get page frame. It's ok if the page is * not available when we're unlocking, as this * may simply mean that a page we locked got * truncated out of existence after we locked it. * * Invoke VOP_GETPAGE() to obtain the page struct * since we may need to read it from disk if its * been paged out. */ if (op != MC_LOCK) pp = page_lookup(vp, off, SE_SHARED); else { page_t *pl[1 + 1]; int error; ASSERT(vp != NULL); error = VOP_GETPAGE(vp, (offset_t)off, PAGESIZE, (uint_t *)NULL, pl, PAGESIZE, seg, addr, S_OTHER, svd->cred); /* * If the error is EDEADLK then we must bounce * up and drop all vm subsystem locks and then * retry the operation later * This behavior is a temporary measure because * ufs/sds logging is badly designed and will * deadlock if we don't allow this bounce to * happen. The real solution is to re-design * the logging code to work properly. See bug * 4125102 for details of the problem. */ if (error == EDEADLK) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (error); } /* * Quit if we fail to fault in the page. Treat * the failure as an error, unless the addr * is mapped beyond the end of a file. */ if (error && svd->vp) { va.va_mask = AT_SIZE; if (VOP_GETATTR(svd->vp, &va, 0, svd->cred) != 0) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EIO); } if (btopr(va.va_size) >= btopr(off + 1)) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EIO); } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } else if (error) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EIO); } pp = pl[0]; ASSERT(pp != NULL); } /* * See Statement at the beginning of this routine. * * claim is always set if MAP_PRIVATE and PROT_WRITE * irrespective of following factors: * * (1) anon slots are populated or not * (2) cow is broken or not * (3) refcnt on ap is 1 or greater than 1 * * See 4140683 for details */ claim = ((VPP_PROT(vpp) & PROT_WRITE) && (svd->type == MAP_PRIVATE)); /* * Perform page-level operation appropriate to * operation. If locking, undo the SOFTLOCK * performed to bring the page into memory * after setting the lock. If unlocking, * and no page was found, account for the claim * separately. */ if (op == MC_LOCK) { int ret = 1; /* Assume success */ /* * Make sure another thread didn't lock * the page after we released the segment * lock. */ if ((attr == 0 || VPP_PROT(vpp) == pageprot) && !VPP_ISPPLOCK(vpp)) { ret = page_pp_lock(pp, claim, 0); if (ret != 0) { VPP_SETPPLOCK(vpp); if (lockmap != (ulong_t *)NULL) BT_SET(lockmap, pos); } } page_unlock(pp); if (ret == 0) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EAGAIN); } } else { if (pp != NULL) { if ((attr == 0 || VPP_PROT(vpp) == pageprot) && VPP_ISPPLOCK(vpp)) page_pp_unlock(pp, claim, 0); page_unlock(pp); } VPP_CLRPPLOCK(vpp); } } } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } /* * Set advice from user for specified pages * There are 5 types of advice: * MADV_NORMAL - Normal (default) behavior (whatever that is) * MADV_RANDOM - Random page references * do not allow readahead or 'klustering' * MADV_SEQUENTIAL - Sequential page references * Pages previous to the one currently being * accessed (determined by fault) are 'not needed' * and are freed immediately * MADV_WILLNEED - Pages are likely to be used (fault ahead in mctl) * MADV_DONTNEED - Pages are not needed (synced out in mctl) * MADV_FREE - Contents can be discarded * MADV_ACCESS_DEFAULT- Default access * MADV_ACCESS_LWP - Next LWP will access heavily * MADV_ACCESS_MANY- Many LWPs or processes will access heavily */ static int segvn_advise(struct seg *seg, caddr_t addr, size_t len, uint_t behav) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; size_t page; int err = 0; int already_set; struct anon_map *amp; ulong_t anon_index; struct seg *next; lgrp_mem_policy_t policy; struct seg *prev; struct vnode *vp; ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); /* * In case of MADV_FREE, we won't be modifying any segment private * data structures; so, we only need to grab READER's lock */ if (behav != MADV_FREE) SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER); else SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); /* * Large pages are assumed to be only turned on when accesses to the * segment's address range have spatial and temporal locality. That * justifies ignoring MADV_SEQUENTIAL for large page segments. * Also, ignore advice affecting lgroup memory allocation * if don't need to do lgroup optimizations on this system */ if ((behav == MADV_SEQUENTIAL && seg->s_szc != 0) || (!lgrp_optimizations() && (behav == MADV_ACCESS_DEFAULT || behav == MADV_ACCESS_LWP || behav == MADV_ACCESS_MANY))) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } if (behav == MADV_SEQUENTIAL || behav == MADV_ACCESS_DEFAULT || behav == MADV_ACCESS_LWP || behav == MADV_ACCESS_MANY) { /* * Since we are going to unload hat mappings * we first have to flush the cache. Otherwise * this might lead to system panic if another * thread is doing physio on the range whose * mappings are unloaded by madvise(3C). */ if (svd->softlockcnt > 0) { /* * Since we do have the segvn writers lock * nobody can fill the cache with entries * belonging to this seg during the purge. * The flush either succeeds or we still * have pending I/Os. In the later case, * madvise(3C) fails. */ segvn_purge(seg); if (svd->softlockcnt > 0) { /* * Since madvise(3C) is advisory and * it's not part of UNIX98, madvise(3C) * failure here doesn't cause any hardship. * Note that we don't block in "as" layer. */ SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (EAGAIN); } } } amp = svd->amp; vp = svd->vp; if (behav == MADV_FREE) { /* * MADV_FREE is not supported for segments with * underlying object; if anonmap is NULL, anon slots * are not yet populated and there is nothing for * us to do. As MADV_FREE is advisory, we don't * return error in either case. */ if (vp || amp == NULL) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } page = seg_page(seg, addr); ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_disclaim(amp, svd->anon_index + page, len, 0); ANON_LOCK_EXIT(&->a_rwlock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (0); } /* * If advice is to be applied to entire segment, * use advice field in seg_data structure * otherwise use appropriate vpage entry. */ if ((addr == seg->s_base) && (len == seg->s_size)) { switch (behav) { case MADV_ACCESS_LWP: case MADV_ACCESS_MANY: case MADV_ACCESS_DEFAULT: /* * Set memory allocation policy for this segment */ policy = lgrp_madv_to_policy(behav, len, svd->type); if (svd->type == MAP_SHARED) already_set = lgrp_shm_policy_set(policy, amp, svd->anon_index, vp, svd->offset, len); else { /* * For private memory, need writers lock on * address space because the segment may be * split or concatenated when changing policy */ if (AS_READ_HELD(seg->s_as, &seg->s_as->a_lock)) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (IE_RETRY); } already_set = lgrp_privm_policy_set(policy, &svd->policy_info, len); } /* * If policy set already and it shouldn't be reapplied, * don't do anything. */ if (already_set && !LGRP_MEM_POLICY_REAPPLICABLE(policy)) break; /* * Mark any existing pages in given range for * migration */ page_mark_migrate(seg, addr, len, amp, svd->anon_index, vp, svd->offset, 1); /* * If same policy set already or this is a shared * memory segment, don't need to try to concatenate * segment with adjacent ones. */ if (already_set || svd->type == MAP_SHARED) break; /* * Try to concatenate this segment with previous * one and next one, since we changed policy for * this one and it may be compatible with adjacent * ones now. */ prev = AS_SEGPREV(seg->s_as, seg); next = AS_SEGNEXT(seg->s_as, seg); if (next && next->s_ops == &segvn_ops && addr + len == next->s_base) (void) segvn_concat(seg, next, 1); if (prev && prev->s_ops == &segvn_ops && addr == prev->s_base + prev->s_size) { /* * Drop lock for private data of current * segment before concatenating (deleting) it * and return IE_REATTACH to tell as_ctl() that * current segment has changed */ SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); if (!segvn_concat(prev, seg, 1)) err = IE_REATTACH; return (err); } break; case MADV_SEQUENTIAL: /* * unloading mapping guarantees * detection in segvn_fault */ ASSERT(seg->s_szc == 0); hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD); /* FALLTHROUGH */ case MADV_NORMAL: case MADV_RANDOM: svd->advice = (uchar_t)behav; svd->pageadvice = 0; break; case MADV_WILLNEED: /* handled in memcntl */ case MADV_DONTNEED: /* handled in memcntl */ case MADV_FREE: /* handled above */ break; default: err = EINVAL; } } else { caddr_t eaddr; struct seg *new_seg; struct segvn_data *new_svd; u_offset_t off; caddr_t oldeaddr; page = seg_page(seg, addr); segvn_vpage(seg); switch (behav) { struct vpage *bvpp, *evpp; case MADV_ACCESS_LWP: case MADV_ACCESS_MANY: case MADV_ACCESS_DEFAULT: /* * Set memory allocation policy for portion of this * segment */ /* * Align address and length of advice to page * boundaries for large pages */ if (seg->s_szc != 0) { size_t pgsz; pgsz = page_get_pagesize(seg->s_szc); addr = (caddr_t)P2ALIGN((uintptr_t)addr, pgsz); len = P2ROUNDUP(len, pgsz); } /* * Check to see whether policy is set already */ policy = lgrp_madv_to_policy(behav, len, svd->type); anon_index = svd->anon_index + page; off = svd->offset + (uintptr_t)(addr - seg->s_base); if (svd->type == MAP_SHARED) already_set = lgrp_shm_policy_set(policy, amp, anon_index, vp, off, len); else already_set = (policy == svd->policy_info.mem_policy); /* * If policy set already and it shouldn't be reapplied, * don't do anything. */ if (already_set && !LGRP_MEM_POLICY_REAPPLICABLE(policy)) break; /* * For private memory, need writers lock on * address space because the segment may be * split or concatenated when changing policy */ if (svd->type == MAP_PRIVATE && AS_READ_HELD(seg->s_as, &seg->s_as->a_lock)) { SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (IE_RETRY); } /* * Mark any existing pages in given range for * migration */ page_mark_migrate(seg, addr, len, amp, svd->anon_index, vp, svd->offset, 1); /* * Don't need to try to split or concatenate * segments, since policy is same or this is a shared * memory segment */ if (already_set || svd->type == MAP_SHARED) break; /* * Split off new segment if advice only applies to a * portion of existing segment starting in middle */ new_seg = NULL; eaddr = addr + len; oldeaddr = seg->s_base + seg->s_size; if (addr > seg->s_base) { /* * Must flush I/O page cache * before splitting segment */ if (svd->softlockcnt > 0) segvn_purge(seg); /* * Split segment and return IE_REATTACH to tell * as_ctl() that current segment changed */ new_seg = segvn_split_seg(seg, addr); new_svd = (struct segvn_data *)new_seg->s_data; err = IE_REATTACH; /* * If new segment ends where old one * did, try to concatenate the new * segment with next one. */ if (eaddr == oldeaddr) { /* * Set policy for new segment */ (void) lgrp_privm_policy_set(policy, &new_svd->policy_info, new_seg->s_size); next = AS_SEGNEXT(new_seg->s_as, new_seg); if (next && next->s_ops == &segvn_ops && eaddr == next->s_base) (void) segvn_concat(new_seg, next, 1); } } /* * Split off end of existing segment if advice only * applies to a portion of segment ending before * end of the existing segment */ if (eaddr < oldeaddr) { /* * Must flush I/O page cache * before splitting segment */ if (svd->softlockcnt > 0) segvn_purge(seg); /* * If beginning of old segment was already * split off, use new segment to split end off * from. */ if (new_seg != NULL && new_seg != seg) { /* * Split segment */ (void) segvn_split_seg(new_seg, eaddr); /* * Set policy for new segment */ (void) lgrp_privm_policy_set(policy, &new_svd->policy_info, new_seg->s_size); } else { /* * Split segment and return IE_REATTACH * to tell as_ctl() that current * segment changed */ (void) segvn_split_seg(seg, eaddr); err = IE_REATTACH; (void) lgrp_privm_policy_set(policy, &svd->policy_info, seg->s_size); /* * If new segment starts where old one * did, try to concatenate it with * previous segment. */ if (addr == seg->s_base) { prev = AS_SEGPREV(seg->s_as, seg); /* * Drop lock for private data * of current segment before * concatenating (deleting) it */ if (prev && prev->s_ops == &segvn_ops && addr == prev->s_base + prev->s_size) { SEGVN_LOCK_EXIT( seg->s_as, &svd->lock); (void) segvn_concat( prev, seg, 1); return (err); } } } } break; case MADV_SEQUENTIAL: ASSERT(seg->s_szc == 0); hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD); /* FALLTHROUGH */ case MADV_NORMAL: case MADV_RANDOM: bvpp = &svd->vpage[page]; evpp = &svd->vpage[page + (len >> PAGESHIFT)]; for (; bvpp < evpp; bvpp++) VPP_SETADVICE(bvpp, behav); svd->advice = MADV_NORMAL; break; case MADV_WILLNEED: /* handled in memcntl */ case MADV_DONTNEED: /* handled in memcntl */ case MADV_FREE: /* handled above */ break; default: err = EINVAL; } } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); return (err); } /* * Create a vpage structure for this seg. */ static void segvn_vpage(struct seg *seg) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vpage *vp, *evp; ASSERT(SEGVN_WRITE_HELD(seg->s_as, &svd->lock)); /* * If no vpage structure exists, allocate one. Copy the protections * and the advice from the segment itself to the individual pages. */ if (svd->vpage == NULL) { svd->pageprot = 1; svd->pageadvice = 1; svd->vpage = kmem_zalloc(seg_pages(seg) * sizeof (struct vpage), KM_SLEEP); evp = &svd->vpage[seg_page(seg, seg->s_base + seg->s_size)]; for (vp = svd->vpage; vp < evp; vp++) { VPP_SETPROT(vp, svd->prot); VPP_SETADVICE(vp, svd->advice); } } } /* * Dump the pages belonging to this segvn segment. */ static void segvn_dump(struct seg *seg) { struct segvn_data *svd; page_t *pp; struct anon_map *amp; ulong_t anon_index; struct vnode *vp; u_offset_t off, offset; pfn_t pfn; pgcnt_t page, npages; caddr_t addr; npages = seg_pages(seg); svd = (struct segvn_data *)seg->s_data; vp = svd->vp; off = offset = svd->offset; addr = seg->s_base; if ((amp = svd->amp) != NULL) { anon_index = svd->anon_index; ANON_LOCK_ENTER(&->a_rwlock, RW_READER); } for (page = 0; page < npages; page++, offset += PAGESIZE) { struct anon *ap; int we_own_it = 0; if (amp && (ap = anon_get_ptr(svd->amp->ahp, anon_index++))) { swap_xlate_nopanic(ap, &vp, &off); } else { vp = svd->vp; off = offset; } /* * If pp == NULL, the page either does not exist * or is exclusively locked. So determine if it * exists before searching for it. */ if ((pp = page_lookup_nowait(vp, off, SE_SHARED))) we_own_it = 1; else pp = page_exists(vp, off); if (pp) { pfn = page_pptonum(pp); dump_addpage(seg->s_as, addr, pfn); if (we_own_it) page_unlock(pp); } addr += PAGESIZE; dump_timeleft = dump_timeout; } if (amp != NULL) ANON_LOCK_EXIT(&->a_rwlock); } /* * lock/unlock anon pages over a given range. Return shadow list */ static int segvn_pagelock(struct seg *seg, caddr_t addr, size_t len, struct page ***ppp, enum lock_type type, enum seg_rw rw) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; size_t np, adjustpages = 0, npages = (len >> PAGESHIFT); ulong_t anon_index; uint_t protchk; uint_t error; struct anon_map *amp; struct page **pplist, **pl, *pp; caddr_t a; size_t page; caddr_t lpgaddr, lpgeaddr; TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_START, "segvn_pagelock: start seg %p addr %p", seg, addr); ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); if (seg->s_szc != 0 && (type == L_PAGELOCK || type == L_PAGEUNLOCK)) { /* * We are adjusting the pagelock region to the large page size * boundary because the unlocked part of a large page cannot * be freed anyway unless all constituent pages of a large * page are locked. Therefore this adjustment allows us to * decrement availrmem by the right value (note we don't want * to just decrement availrem by the large page size without * adjusting addr and len because then we may end up * decrementing availrmem by large page size for every * constituent page locked by a new as_pagelock call). * as_pageunlock caller must always match as_pagelock call's * addr and len. * * Note segment's page size cannot change while we are holding * as lock. And then it cannot change while softlockcnt is * not 0. This will allow us to correctly recalculate large * page size region for the matching pageunlock/reclaim call. * * for pageunlock *ppp points to the pointer of page_t that * corresponds to the real unadjusted start address. Similar * for pagelock *ppp must point to the pointer of page_t that * corresponds to the real unadjusted start address. */ size_t pgsz = page_get_pagesize(seg->s_szc); CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr); adjustpages = ((uintptr_t)(addr - lpgaddr)) >> PAGESHIFT; } if (type == L_PAGEUNLOCK) { /* * update hat ref bits for /proc. We need to make sure * that threads tracing the ref and mod bits of the * address space get the right data. * Note: page ref and mod bits are updated at reclaim time */ if (seg->s_as->a_vbits) { for (a = addr; a < addr + len; a += PAGESIZE) { if (rw == S_WRITE) { hat_setstat(seg->s_as, a, PAGESIZE, P_REF | P_MOD); } else { hat_setstat(seg->s_as, a, PAGESIZE, P_REF); } } } SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); if (seg->s_szc != 0) { VM_STAT_ADD(segvnvmstats.pagelock[0]); seg_pinactive(seg, lpgaddr, lpgeaddr - lpgaddr, *ppp - adjustpages, rw, segvn_reclaim); } else { seg_pinactive(seg, addr, len, *ppp, rw, segvn_reclaim); } /* * If someone is blocked while unmapping, we purge * segment page cache and thus reclaim pplist synchronously * without waiting for seg_pasync_thread. This speeds up * unmapping in cases where munmap(2) is called, while * raw async i/o is still in progress or where a thread * exits on data fault in a multithreaded application. */ if (AS_ISUNMAPWAIT(seg->s_as) && (svd->softlockcnt > 0)) { /* * Even if we grab segvn WRITER's lock or segp_slock * here, there might be another thread which could've * successfully performed lookup/insert just before * we acquired the lock here. So, grabbing either * lock here is of not much use. Until we devise * a strategy at upper layers to solve the * synchronization issues completely, we expect * applications to handle this appropriately. */ segvn_purge(seg); } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_UNLOCK_END, "segvn_pagelock: unlock seg %p addr %p", seg, addr); return (0); } else if (type == L_PAGERECLAIM) { VM_STAT_COND_ADD(seg->s_szc != 0, segvnvmstats.pagelock[1]); SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); (void) segvn_reclaim(seg, addr, len, *ppp, rw); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_UNLOCK_END, "segvn_pagelock: reclaim seg %p addr %p", seg, addr); return (0); } if (seg->s_szc != 0) { VM_STAT_ADD(segvnvmstats.pagelock[2]); addr = lpgaddr; len = lpgeaddr - lpgaddr; npages = (len >> PAGESHIFT); } /* * for now we only support pagelock to anon memory. We've to check * protections for vnode objects and call into the vnode driver. * That's too much for a fast path. Let the fault entry point handle it. */ if (svd->vp != NULL) { TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_MISS_END, "segvn_pagelock: mapped vnode seg %p addr %p", seg, addr); *ppp = NULL; return (ENOTSUP); } /* * if anonmap is not yet created, let the fault entry point populate it * with anon ptrs. */ if ((amp = svd->amp) == NULL) { TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_MISS_END, "segvn_pagelock: anonmap null seg %p addr %p", seg, addr); *ppp = NULL; return (EFAULT); } SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); /* * we acquire segp_slock to prevent duplicate entries * in seg_pcache */ mutex_enter(&svd->segp_slock); /* * try to find pages in segment page cache */ pplist = seg_plookup(seg, addr, len, rw); if (pplist != NULL) { mutex_exit(&svd->segp_slock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); *ppp = pplist + adjustpages; TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_HIT_END, "segvn_pagelock: cache hit seg %p addr %p", seg, addr); return (0); } if (rw == S_READ) { protchk = PROT_READ; } else { protchk = PROT_WRITE; } if (svd->pageprot == 0) { if ((svd->prot & protchk) == 0) { mutex_exit(&svd->segp_slock); error = EFAULT; goto out; } } else { /* * check page protections */ for (a = addr; a < addr + len; a += PAGESIZE) { struct vpage *vp; vp = &svd->vpage[seg_page(seg, a)]; if ((VPP_PROT(vp) & protchk) == 0) { mutex_exit(&svd->segp_slock); error = EFAULT; goto out; } } } mutex_enter(&freemem_lock); if (availrmem < tune.t_minarmem + npages) { mutex_exit(&freemem_lock); mutex_exit(&svd->segp_slock); error = ENOMEM; goto out; } else { svd->softlockcnt += npages; availrmem -= npages; segvn_pages_locked += npages; } mutex_exit(&freemem_lock); pplist = kmem_alloc(sizeof (page_t *) * npages, KM_SLEEP); pl = pplist; *ppp = pplist + adjustpages; page = seg_page(seg, addr); anon_index = svd->anon_index + page; ANON_LOCK_ENTER(&->a_rwlock, RW_READER); for (a = addr; a < addr + len; a += PAGESIZE, anon_index++) { struct anon *ap; struct vnode *vp; u_offset_t off; anon_sync_obj_t cookie; anon_array_enter(amp, anon_index, &cookie); ap = anon_get_ptr(amp->ahp, anon_index); if (ap == NULL) { anon_array_exit(&cookie); break; } else { /* * We must never use seg_pcache for COW pages * because we might end up with original page still * lying in seg_pcache even after private page is * created. This leads to data corruption as * aio_write refers to the page still in cache * while all other accesses refer to the private * page. */ if (ap->an_refcnt != 1) { anon_array_exit(&cookie); break; } } swap_xlate(ap, &vp, &off); anon_array_exit(&cookie); pp = page_lookup_nowait(vp, off, SE_SHARED); if (pp == NULL) { break; } *pplist++ = pp; } ANON_LOCK_EXIT(&->a_rwlock); if (a >= addr + len) { (void) seg_pinsert(seg, addr, len, pl, rw, SEGP_ASYNC_FLUSH, segvn_reclaim); mutex_exit(&svd->segp_slock); SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_FILL_END, "segvn_pagelock: cache fill seg %p addr %p", seg, addr); return (0); } mutex_exit(&svd->segp_slock); error = EFAULT; pplist = pl; np = ((uintptr_t)(a - addr)) >> PAGESHIFT; while (np > (uint_t)0) { page_unlock(*pplist); np--; pplist++; } kmem_free(pl, sizeof (page_t *) * npages); mutex_enter(&freemem_lock); svd->softlockcnt -= npages; availrmem += npages; segvn_pages_locked -= npages; mutex_exit(&freemem_lock); if (svd->softlockcnt <= 0) { if (AS_ISUNMAPWAIT(seg->s_as)) { mutex_enter(&seg->s_as->a_contents); if (AS_ISUNMAPWAIT(seg->s_as)) { AS_CLRUNMAPWAIT(seg->s_as); cv_broadcast(&seg->s_as->a_cv); } mutex_exit(&seg->s_as->a_contents); } } out: SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); *ppp = NULL; TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_MISS_END, "segvn_pagelock: cache miss seg %p addr %p", seg, addr); return (error); } /* * purge any cached pages in the I/O page cache */ static void segvn_purge(struct seg *seg) { seg_ppurge(seg); } static int segvn_reclaim(struct seg *seg, caddr_t addr, size_t len, struct page **pplist, enum seg_rw rw) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; pgcnt_t np, npages; struct page **pl; #ifdef lint addr = addr; #endif npages = np = (len >> PAGESHIFT); ASSERT(npages); pl = pplist; if (seg->s_szc != 0) { size_t pgsz = page_get_pagesize(seg->s_szc); if (!IS_P2ALIGNED(addr, pgsz) || !IS_P2ALIGNED(len, pgsz)) { panic("segvn_reclaim: unaligned addr or len"); /*NOTREACHED*/ } } while (np > (uint_t)0) { if (rw == S_WRITE) { hat_setrefmod(*pplist); } else { hat_setref(*pplist); } page_unlock(*pplist); np--; pplist++; } kmem_free(pl, sizeof (page_t *) * npages); mutex_enter(&freemem_lock); availrmem += npages; segvn_pages_locked -= npages; svd->softlockcnt -= npages; mutex_exit(&freemem_lock); if (svd->softlockcnt <= 0) { if (AS_ISUNMAPWAIT(seg->s_as)) { mutex_enter(&seg->s_as->a_contents); if (AS_ISUNMAPWAIT(seg->s_as)) { AS_CLRUNMAPWAIT(seg->s_as); cv_broadcast(&seg->s_as->a_cv); } mutex_exit(&seg->s_as->a_contents); } } return (0); } /* * get a memory ID for an addr in a given segment * * XXX only creates PAGESIZE pages if anon slots are not initialized. * At fault time they will be relocated into larger pages. */ static int segvn_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct anon *ap = NULL; ulong_t anon_index; struct anon_map *amp; anon_sync_obj_t cookie; if (svd->type == MAP_PRIVATE) { memidp->val[0] = (uintptr_t)seg->s_as; memidp->val[1] = (uintptr_t)addr; return (0); } if (svd->type == MAP_SHARED) { if (svd->vp) { memidp->val[0] = (uintptr_t)svd->vp; memidp->val[1] = (u_longlong_t)svd->offset + (uintptr_t)(addr - seg->s_base); return (0); } else { SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER); if ((amp = svd->amp) != NULL) { anon_index = svd->anon_index + seg_page(seg, addr); } SEGVN_LOCK_EXIT(seg->s_as, &svd->lock); ASSERT(amp != NULL); ANON_LOCK_ENTER(&->a_rwlock, RW_READER); anon_array_enter(amp, anon_index, &cookie); ap = anon_get_ptr(amp->ahp, anon_index); if (ap == NULL) { page_t *pp; pp = anon_zero(seg, addr, &ap, svd->cred); if (pp == NULL) { anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); return (ENOMEM); } ASSERT(anon_get_ptr(amp->ahp, anon_index) == NULL); (void) anon_set_ptr(amp->ahp, anon_index, ap, ANON_SLEEP); page_unlock(pp); } anon_array_exit(&cookie); ANON_LOCK_EXIT(&->a_rwlock); memidp->val[0] = (uintptr_t)ap; memidp->val[1] = (uintptr_t)addr & PAGEOFFSET; return (0); } } return (EINVAL); } static int sameprot(struct seg *seg, caddr_t a, size_t len) { struct segvn_data *svd = (struct segvn_data *)seg->s_data; struct vpage *vpage; spgcnt_t pages = btop(len); uint_t prot; if (svd->pageprot == 0) return (1); ASSERT(svd->vpage != NULL); vpage = &svd->vpage[seg_page(seg, a)]; prot = VPP_PROT(vpage); vpage++; pages--; while (pages-- > 0) { if (prot != VPP_PROT(vpage)) return (0); vpage++; } return (1); } /* * Get memory allocation policy info for specified address in given segment */ static lgrp_mem_policy_info_t * segvn_getpolicy(struct seg *seg, caddr_t addr) { struct anon_map *amp; ulong_t anon_index; lgrp_mem_policy_info_t *policy_info; struct segvn_data *svn_data; u_offset_t vn_off; vnode_t *vp; ASSERT(seg != NULL); svn_data = (struct segvn_data *)seg->s_data; if (svn_data == NULL) return (NULL); /* * Get policy info for private or shared memory */ if (svn_data->type != MAP_SHARED) policy_info = &svn_data->policy_info; else { amp = svn_data->amp; anon_index = svn_data->anon_index + seg_page(seg, addr); vp = svn_data->vp; vn_off = svn_data->offset + (uintptr_t)(addr - seg->s_base); policy_info = lgrp_shm_policy_get(amp, anon_index, vp, vn_off); } return (policy_info); } /*ARGSUSED*/ static int segvn_capable(struct seg *seg, segcapability_t capability) { return (0); }