1 /*- 2 * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 3 * Copyright (c) 1982, 1986, 1991, 1993 4 * The Regents of the University of California. All rights reserved. 5 * (c) UNIX System Laboratories, Inc. 6 * All or some portions of this file are derived from material licensed 7 * to the University of California by American Telephone and Telegraph 8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9 * the permission of UNIX System Laboratories, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/systm.h> 42 #include <sys/uio.h> 43 44 #include <vm/vm.h> 45 #include <vm/vm_page.h> 46 47 #include <machine/vmparam.h> 48 49 /* 50 * Implement uiomove(9) from physical memory using the direct map to 51 * avoid the creation and destruction of ephemeral mappings. 52 */ 53 int 54 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 55 { 56 struct thread *td = curthread; 57 struct iovec *iov; 58 void *cp; 59 vm_offset_t page_offset, vaddr; 60 size_t cnt; 61 int error = 0; 62 int save = 0; 63 bool mapped; 64 65 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 66 ("uiomove_fromphys: mode")); 67 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 68 ("uiomove_fromphys proc")); 69 KASSERT(uio->uio_resid >= 0, 70 ("%s: uio %p resid underflow", __func__, uio)); 71 72 save = td->td_pflags & TDP_DEADLKTREAT; 73 td->td_pflags |= TDP_DEADLKTREAT; 74 mapped = false; 75 while (n > 0 && uio->uio_resid) { 76 KASSERT(uio->uio_iovcnt > 0, 77 ("%s: uio %p iovcnt underflow", __func__, uio)); 78 79 iov = uio->uio_iov; 80 cnt = iov->iov_len; 81 if (cnt == 0) { 82 uio->uio_iov++; 83 uio->uio_iovcnt--; 84 continue; 85 } 86 if (cnt > n) 87 cnt = n; 88 page_offset = offset & PAGE_MASK; 89 cnt = min(cnt, PAGE_SIZE - page_offset); 90 if (uio->uio_segflg != UIO_NOCOPY) { 91 mapped = pmap_map_io_transient( 92 &ma[offset >> PAGE_SHIFT], &vaddr, 1, true); 93 cp = (char *)vaddr + page_offset; 94 } 95 switch (uio->uio_segflg) { 96 case UIO_USERSPACE: 97 maybe_yield(); 98 if (uio->uio_rw == UIO_READ) 99 error = copyout(cp, iov->iov_base, cnt); 100 else 101 error = copyin(iov->iov_base, cp, cnt); 102 if (error) 103 goto out; 104 break; 105 case UIO_SYSSPACE: 106 if (uio->uio_rw == UIO_READ) 107 bcopy(cp, iov->iov_base, cnt); 108 else 109 bcopy(iov->iov_base, cp, cnt); 110 break; 111 case UIO_NOCOPY: 112 break; 113 } 114 if (__predict_false(mapped)) { 115 pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], 116 &vaddr, 1, true); 117 mapped = false; 118 } 119 iov->iov_base = (char *)iov->iov_base + cnt; 120 iov->iov_len -= cnt; 121 uio->uio_resid -= cnt; 122 uio->uio_offset += cnt; 123 offset += cnt; 124 n -= cnt; 125 } 126 out: 127 if (__predict_false(mapped)) { 128 panic("ARM64TODO: uiomove_fromphys"); 129 pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], &vaddr, 1, 130 true); 131 } 132 if (save == 0) 133 td->td_pflags &= ~TDP_DEADLKTREAT; 134 return (error); 135 } 136