1139724Simp/*- 2127282Salc * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 3127282Salc * Copyright (c) 1982, 1986, 1991, 1993 4127282Salc * The Regents of the University of California. All rights reserved. 5127282Salc * (c) UNIX System Laboratories, Inc. 6127282Salc * All or some portions of this file are derived from material licensed 7127282Salc * to the University of California by American Telephone and Telegraph 8127282Salc * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9127282Salc * the permission of UNIX System Laboratories, Inc. 10127282Salc * 11127282Salc * Redistribution and use in source and binary forms, with or without 12127282Salc * modification, are permitted provided that the following conditions 13127282Salc * are met: 14127282Salc * 1. Redistributions of source code must retain the above copyright 15127282Salc * notice, this list of conditions and the following disclaimer. 16127282Salc * 2. Redistributions in binary form must reproduce the above copyright 17127282Salc * notice, this list of conditions and the following disclaimer in the 18127282Salc * documentation and/or other materials provided with the distribution. 19266312Sian * 3. Neither the name of the University nor the names of its contributors 20127282Salc * may be used to endorse or promote products derived from this software 21127282Salc * without specific prior written permission. 22127282Salc * 23127282Salc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24127282Salc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25127282Salc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26127282Salc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27127282Salc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28127282Salc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29127282Salc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30127282Salc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31127282Salc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32127282Salc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33127282Salc * SUCH DAMAGE. 34127282Salc * 35127282Salc * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 36127282Salc */ 37127282Salc 38127282Salc#include <sys/cdefs.h> 39127282Salc__FBSDID("$FreeBSD$"); 40127282Salc 41127282Salc#include <sys/param.h> 42253367Sae#include <sys/systm.h> 43127282Salc#include <sys/kernel.h> 44127282Salc#include <sys/lock.h> 45127282Salc#include <sys/mutex.h> 46127282Salc#include <sys/proc.h> 47141848Salc#include <sys/sched.h> 48127282Salc#include <sys/sf_buf.h> 49127282Salc#include <sys/uio.h> 50127282Salc 51127282Salc#include <vm/vm.h> 52127282Salc#include <vm/vm_page.h> 53127282Salc 54127282Salc/* 55127282Salc * Implement uiomove(9) from physical memory using sf_bufs to reduce 56127282Salc * the creation and destruction of ephemeral mappings. 57127282Salc */ 58127282Salcint 59127282Salcuiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 60127282Salc{ 61127282Salc struct sf_buf *sf; 62127282Salc struct thread *td = curthread; 63127282Salc struct iovec *iov; 64127282Salc void *cp; 65127282Salc vm_offset_t page_offset; 66127282Salc size_t cnt; 67127282Salc int error = 0; 68127282Salc int save = 0; 69127282Salc 70127282Salc KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 71127282Salc ("uiomove_fromphys: mode")); 72127282Salc KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 73127282Salc ("uiomove_fromphys proc")); 74130028Stjr save = td->td_pflags & TDP_DEADLKTREAT; 75130028Stjr td->td_pflags |= TDP_DEADLKTREAT; 76127282Salc while (n > 0 && uio->uio_resid) { 77127282Salc iov = uio->uio_iov; 78127282Salc cnt = iov->iov_len; 79127282Salc if (cnt == 0) { 80127282Salc uio->uio_iov++; 81127282Salc uio->uio_iovcnt--; 82127282Salc continue; 83127282Salc } 84127282Salc if (cnt > n) 85127282Salc cnt = n; 86127282Salc page_offset = offset & PAGE_MASK; 87127282Salc cnt = min(cnt, PAGE_SIZE - page_offset); 88141848Salc sched_pin(); 89141848Salc sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], SFB_CPUPRIVATE); 90127282Salc cp = (char *)sf_buf_kva(sf) + page_offset; 91127282Salc switch (uio->uio_segflg) { 92127282Salc case UIO_USERSPACE: 93218195Smdf maybe_yield(); 94127282Salc if (uio->uio_rw == UIO_READ) 95127282Salc error = copyout(cp, iov->iov_base, cnt); 96127282Salc else 97127282Salc error = copyin(iov->iov_base, cp, cnt); 98134127Salc if (error) { 99134127Salc sf_buf_free(sf); 100141848Salc sched_unpin(); 101127282Salc goto out; 102134127Salc } 103127282Salc break; 104127282Salc case UIO_SYSSPACE: 105127282Salc if (uio->uio_rw == UIO_READ) 106127282Salc bcopy(cp, iov->iov_base, cnt); 107127282Salc else 108127282Salc bcopy(iov->iov_base, cp, cnt); 109127282Salc break; 110127282Salc case UIO_NOCOPY: 111127282Salc break; 112127282Salc } 113127282Salc sf_buf_free(sf); 114141848Salc sched_unpin(); 115127282Salc iov->iov_base = (char *)iov->iov_base + cnt; 116127282Salc iov->iov_len -= cnt; 117127282Salc uio->uio_resid -= cnt; 118127282Salc uio->uio_offset += cnt; 119127282Salc offset += cnt; 120127282Salc n -= cnt; 121127282Salc } 122127282Salcout: 123130028Stjr if (save == 0) 124130023Stjr td->td_pflags &= ~TDP_DEADLKTREAT; 125127282Salc return (error); 126127282Salc} 127