1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department, and code derived from software contributed to 11 * Berkeley by William Jolitz. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 38 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 39 */ 40 41 #include <sys/cdefs.h> 42 /* 43 * Memory special file 44 */ 45 46 #include <sys/param.h> 47 #include <sys/conf.h> 48 #include <sys/fcntl.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/ioccom.h> 52 #include <sys/malloc.h> 53 #include <sys/memrange.h> 54 #include <sys/module.h> 55 #include <sys/mutex.h> 56 #include <sys/proc.h> 57 #include <sys/msgbuf.h> 58 #include <sys/systm.h> 59 #include <sys/signalvar.h> 60 #include <sys/uio.h> 61 62 #include <machine/md_var.h> 63 #include <machine/vmparam.h> 64 65 #include <vm/vm.h> 66 #include <vm/pmap.h> 67 #include <vm/vm_extern.h> 68 #include <vm/vm_page.h> 69 70 #include <machine/memdev.h> 71 72 static void ppc_mrinit(struct mem_range_softc *); 73 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *); 74 75 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 76 77 static struct mem_range_ops ppc_mem_range_ops = { 78 ppc_mrinit, 79 ppc_mrset, 80 NULL, 81 NULL 82 }; 83 struct mem_range_softc mem_range_softc = { 84 &ppc_mem_range_ops, 85 0, 0, NULL 86 }; 87 88 /* ARGSUSED */ 89 int 90 memrw(struct cdev *dev, struct uio *uio, int flags) 91 { 92 struct iovec *iov; 93 int error = 0; 94 vm_offset_t va, eva, off, v; 95 vm_prot_t prot; 96 struct vm_page m; 97 vm_page_t marr; 98 vm_size_t cnt; 99 ssize_t orig_resid; 100 101 cnt = 0; 102 error = 0; 103 orig_resid = uio->uio_resid; 104 105 while (uio->uio_resid > 0 && !error) { 106 iov = uio->uio_iov; 107 if (iov->iov_len == 0) { 108 uio->uio_iov++; 109 uio->uio_iovcnt--; 110 if (uio->uio_iovcnt < 0) 111 panic("memrw"); 112 continue; 113 } 114 if (dev2unit(dev) == CDEV_MINOR_MEM) { 115 v = uio->uio_offset; 116 117 kmem_direct_mapped: off = v & PAGE_MASK; 118 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base & 119 PAGE_MASK); 120 cnt = min(cnt, PAGE_SIZE - off); 121 cnt = min(cnt, iov->iov_len); 122 123 if (mem_valid(v, cnt)) { 124 error = EFAULT; 125 break; 126 } 127 128 if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) { 129 error = uiomove((void *)PHYS_TO_DMAP(v), cnt, 130 uio); 131 } else { 132 m.phys_addr = trunc_page(v); 133 marr = &m; 134 error = uiomove_fromphys(&marr, off, cnt, uio); 135 } 136 } 137 else if (dev2unit(dev) == CDEV_MINOR_KMEM) { 138 va = uio->uio_offset; 139 140 if (hw_direct_map && 141 ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))) { 142 v = DMAP_TO_PHYS(va); 143 goto kmem_direct_mapped; 144 } 145 146 va = trunc_page(uio->uio_offset); 147 eva = round_page(uio->uio_offset 148 + iov->iov_len); 149 150 /* 151 * Make sure that all the pages are currently resident 152 * so that we don't create any zero-fill pages. 153 */ 154 155 for (; va < eva; va += PAGE_SIZE) { 156 if (pmap_extract(kernel_pmap, va) == 0) { 157 error = EFAULT; 158 break; 159 } 160 } 161 if (error != 0) 162 break; 163 164 prot = (uio->uio_rw == UIO_READ) 165 ? VM_PROT_READ : VM_PROT_WRITE; 166 167 va = uio->uio_offset; 168 if (((va >= VM_MIN_KERNEL_ADDRESS) && (va <= virtual_end)) && 169 !kernacc((void *) va, iov->iov_len, prot)) { 170 error = EFAULT; 171 break; 172 } 173 174 error = uiomove((void *)va, iov->iov_len, uio); 175 } 176 } 177 /* 178 * Don't return error if any byte was written. Read and write 179 * can return error only if no i/o was performed. 180 */ 181 if (uio->uio_resid != orig_resid) 182 error = 0; 183 return (error); 184 } 185 186 /* 187 * allow user processes to MMAP some memory sections 188 * instead of going through read/write 189 */ 190 int 191 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 192 int prot, vm_memattr_t *memattr) 193 { 194 int i; 195 196 if (dev2unit(dev) == CDEV_MINOR_MEM) 197 *paddr = offset; 198 else 199 return (EFAULT); 200 201 for (i = 0; i < mem_range_softc.mr_ndesc; i++) { 202 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE)) 203 continue; 204 205 if (offset >= mem_range_softc.mr_desc[i].mr_base && 206 offset < mem_range_softc.mr_desc[i].mr_base + 207 mem_range_softc.mr_desc[i].mr_len) { 208 switch (mem_range_softc.mr_desc[i].mr_flags & 209 MDF_ATTRMASK) { 210 case MDF_WRITEBACK: 211 *memattr = VM_MEMATTR_WRITE_BACK; 212 break; 213 case MDF_WRITECOMBINE: 214 *memattr = VM_MEMATTR_WRITE_COMBINING; 215 break; 216 case MDF_UNCACHEABLE: 217 *memattr = VM_MEMATTR_UNCACHEABLE; 218 break; 219 case MDF_WRITETHROUGH: 220 *memattr = VM_MEMATTR_WRITE_THROUGH; 221 break; 222 } 223 224 break; 225 } 226 } 227 228 return (0); 229 } 230 231 static void 232 ppc_mrinit(struct mem_range_softc *sc) 233 { 234 sc->mr_cap = 0; 235 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */ 236 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc), 237 M_MEMDESC, M_WAITOK | M_ZERO); 238 } 239 240 static int 241 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg) 242 { 243 int i; 244 245 switch(*arg) { 246 case MEMRANGE_SET_UPDATE: 247 for (i = 0; i < sc->mr_ndesc; i++) { 248 if (!sc->mr_desc[i].mr_len) { 249 sc->mr_desc[i] = *desc; 250 sc->mr_desc[i].mr_flags |= MDF_ACTIVE; 251 return (0); 252 } 253 if (sc->mr_desc[i].mr_base == desc->mr_base && 254 sc->mr_desc[i].mr_len == desc->mr_len) 255 return (EEXIST); 256 } 257 return (ENOSPC); 258 case MEMRANGE_SET_REMOVE: 259 for (i = 0; i < sc->mr_ndesc; i++) 260 if (sc->mr_desc[i].mr_base == desc->mr_base && 261 sc->mr_desc[i].mr_len == desc->mr_len) { 262 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i])); 263 return (0); 264 } 265 return (ENOENT); 266 default: 267 return (EOPNOTSUPP); 268 } 269 270 return (0); 271 } 272 273 /* 274 * Operations for changing memory attributes. 275 * 276 * This is basically just an ioctl shim for mem_range_attr_get 277 * and mem_range_attr_set. 278 */ 279 int 280 memioctl_md(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags, 281 struct thread *td) 282 { 283 int nd, error = 0; 284 struct mem_range_op *mo = (struct mem_range_op *)data; 285 struct mem_range_desc *md; 286 287 /* is this for us? */ 288 if ((cmd != MEMRANGE_GET) && 289 (cmd != MEMRANGE_SET)) 290 return (ENOTTY); 291 292 /* any chance we can handle this? */ 293 if (mem_range_softc.mr_op == NULL) 294 return (EOPNOTSUPP); 295 296 /* do we have any descriptors? */ 297 if (mem_range_softc.mr_ndesc == 0) 298 return (ENXIO); 299 300 switch (cmd) { 301 case MEMRANGE_GET: 302 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 303 if (nd > 0) { 304 md = (struct mem_range_desc *) 305 malloc(nd * sizeof(struct mem_range_desc), 306 M_MEMDESC, M_WAITOK); 307 error = mem_range_attr_get(md, &nd); 308 if (!error) 309 error = copyout(md, mo->mo_desc, 310 nd * sizeof(struct mem_range_desc)); 311 free(md, M_MEMDESC); 312 } 313 else 314 nd = mem_range_softc.mr_ndesc; 315 mo->mo_arg[0] = nd; 316 break; 317 318 case MEMRANGE_SET: 319 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc), 320 M_MEMDESC, M_WAITOK); 321 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 322 /* clamp description string */ 323 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 324 if (error == 0) 325 error = mem_range_attr_set(md, &mo->mo_arg[0]); 326 free(md, M_MEMDESC); 327 break; 328 } 329 return (error); 330 } 331