mem.c

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    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 __FBSDID("$FreeBSD$");
   43 
   44 /*
   45  * Memory special file
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/conf.h>
   50 #include <sys/fcntl.h>
   51 #include <sys/kernel.h>
   52 #include <sys/lock.h>
   53 #include <sys/ioccom.h>
   54 #include <sys/malloc.h>
   55 #include <sys/memrange.h>
   56 #include <sys/module.h>
   57 #include <sys/mutex.h>
   58 #include <sys/proc.h>
   59 #include <sys/msgbuf.h>
   60 #include <sys/systm.h>
   61 #include <sys/signalvar.h>
   62 #include <sys/uio.h>
   63 
   64 #include <machine/md_var.h>
   65 #include <machine/vmparam.h>
   66 
   67 #include <vm/vm.h>
   68 #include <vm/pmap.h>
   69 #include <vm/vm_extern.h>
   70 #include <vm/vm_page.h>
   71 
   72 #include <machine/memdev.h>
   73 
   74 static void ppc_mrinit(struct mem_range_softc *);
   75 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
   76 
   77 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
   78 
   79 static struct mem_range_ops ppc_mem_range_ops = {
   80         ppc_mrinit,
   81         ppc_mrset,
   82         NULL,
   83         NULL
   84 };
   85 struct mem_range_softc mem_range_softc = {
   86         &ppc_mem_range_ops,
   87         0, 0, NULL
   88 }; 
   89 
   90 /* ARGSUSED */
   91 int
   92 memrw(struct cdev *dev, struct uio *uio, int flags)
   93 {
   94         struct iovec *iov;
   95         int error = 0;
   96         vm_offset_t va, eva, off, v;
   97         vm_prot_t prot;
   98         struct vm_page m;
   99         vm_page_t marr;
  100         vm_size_t cnt;
  101         ssize_t orig_resid;
  102 
  103         cnt = 0;
  104         error = 0;
  105         orig_resid = uio->uio_resid;
  106 
  107         while (uio->uio_resid > 0 && !error) {
  108                 iov = uio->uio_iov;
  109                 if (iov->iov_len == 0) {
  110                         uio->uio_iov++;
  111                         uio->uio_iovcnt--;
  112                         if (uio->uio_iovcnt < 0)
  113                                 panic("memrw");
  114                         continue;
  115                 }
  116                 if (dev2unit(dev) == CDEV_MINOR_MEM) {
  117                         v = uio->uio_offset;
  118 
  119 kmem_direct_mapped:     off = v & PAGE_MASK;
  120                         cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
  121                             PAGE_MASK);
  122                         cnt = min(cnt, PAGE_SIZE - off);
  123                         cnt = min(cnt, iov->iov_len);
  124 
  125                         if (mem_valid(v, cnt)) {
  126                                 error = EFAULT;
  127                                 break;
  128                         }
  129 
  130                         if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) {
  131                                 error = uiomove((void *)PHYS_TO_DMAP(v), cnt,
  132                                     uio);
  133                         } else {
  134                                 m.phys_addr = trunc_page(v);
  135                                 marr = &m;
  136                                 error = uiomove_fromphys(&marr, off, cnt, uio);
  137                         }
  138                 }
  139                 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
  140                         va = uio->uio_offset;
  141 
  142                         if (hw_direct_map &&
  143                             ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))) {
  144                                 v = DMAP_TO_PHYS(va);
  145                                 goto kmem_direct_mapped;
  146                         }
  147 
  148                         va = trunc_page(uio->uio_offset);
  149                         eva = round_page(uio->uio_offset
  150                             + iov->iov_len);
  151 
  152                         /* 
  153                          * Make sure that all the pages are currently resident
  154                          * so that we don't create any zero-fill pages.
  155                          */
  156 
  157                         for (; va < eva; va += PAGE_SIZE) {
  158                                 if (pmap_extract(kernel_pmap, va) == 0) {
  159                                         error = EFAULT;
  160                                         break;
  161                                 }
  162                         }
  163                         if (error != 0)
  164                                 break;
  165 
  166                         prot = (uio->uio_rw == UIO_READ)
  167                             ? VM_PROT_READ : VM_PROT_WRITE;
  168 
  169                         va = uio->uio_offset;
  170                         if (((va >= VM_MIN_KERNEL_ADDRESS) && (va <= virtual_end)) &&
  171                             !kernacc((void *) va, iov->iov_len, prot)) {
  172                                 error = EFAULT;
  173                                 break;
  174                         }
  175 
  176                         error = uiomove((void *)va, iov->iov_len, uio);
  177                 }
  178         }
  179         /*
  180          * Don't return error if any byte was written.  Read and write
  181          * can return error only if no i/o was performed.
  182          */
  183         if (uio->uio_resid != orig_resid)
  184                 error = 0;
  185         return (error);
  186 }
  187 
  188 /*
  189  * allow user processes to MMAP some memory sections
  190  * instead of going through read/write
  191  */
  192 int
  193 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
  194     int prot, vm_memattr_t *memattr)
  195 {
  196         int i;
  197 
  198         if (dev2unit(dev) == CDEV_MINOR_MEM)
  199                 *paddr = offset;
  200         else
  201                 return (EFAULT);
  202 
  203         for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
  204                 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
  205                         continue;
  206 
  207                 if (offset >= mem_range_softc.mr_desc[i].mr_base &&
  208                     offset < mem_range_softc.mr_desc[i].mr_base +
  209                     mem_range_softc.mr_desc[i].mr_len) {
  210                         switch (mem_range_softc.mr_desc[i].mr_flags &
  211                             MDF_ATTRMASK) {
  212                         case MDF_WRITEBACK:
  213                                 *memattr = VM_MEMATTR_WRITE_BACK;
  214                                 break;
  215                         case MDF_WRITECOMBINE:
  216                                 *memattr = VM_MEMATTR_WRITE_COMBINING;
  217                                 break;
  218                         case MDF_UNCACHEABLE:
  219                                 *memattr = VM_MEMATTR_UNCACHEABLE;
  220                                 break;
  221                         case MDF_WRITETHROUGH:
  222                                 *memattr = VM_MEMATTR_WRITE_THROUGH;
  223                                 break;
  224                         }
  225 
  226                         break;
  227                 }
  228         }
  229 
  230         return (0);
  231 }
  232 
  233 static void
  234 ppc_mrinit(struct mem_range_softc *sc)
  235 {
  236         sc->mr_cap = 0;
  237         sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
  238         sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
  239             M_MEMDESC, M_WAITOK | M_ZERO);
  240 }
  241 
  242 static int
  243 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
  244 {
  245         int i;
  246 
  247         switch(*arg) {
  248         case MEMRANGE_SET_UPDATE:
  249                 for (i = 0; i < sc->mr_ndesc; i++) {
  250                         if (!sc->mr_desc[i].mr_len) {
  251                                 sc->mr_desc[i] = *desc;
  252                                 sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
  253                                 return (0);
  254                         }
  255                         if (sc->mr_desc[i].mr_base == desc->mr_base &&
  256                             sc->mr_desc[i].mr_len == desc->mr_len)
  257                                 return (EEXIST);
  258                 }
  259                 return (ENOSPC);
  260         case MEMRANGE_SET_REMOVE:
  261                 for (i = 0; i < sc->mr_ndesc; i++)
  262                         if (sc->mr_desc[i].mr_base == desc->mr_base &&
  263                             sc->mr_desc[i].mr_len == desc->mr_len) {
  264                                 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
  265                                 return (0);
  266                         }
  267                 return (ENOENT);
  268         default:
  269                 return (EOPNOTSUPP);
  270         }
  271 
  272         return (0);
  273 }
  274 
  275 /*
  276  * Operations for changing memory attributes.
  277  *
  278  * This is basically just an ioctl shim for mem_range_attr_get
  279  * and mem_range_attr_set.
  280  */
  281 int 
  282 memioctl_md(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
  283     struct thread *td)
  284 {
  285         int nd, error = 0;
  286         struct mem_range_op *mo = (struct mem_range_op *)data;
  287         struct mem_range_desc *md;
  288 
  289         /* is this for us? */
  290         if ((cmd != MEMRANGE_GET) &&
  291             (cmd != MEMRANGE_SET))
  292                 return (ENOTTY);
  293 
  294         /* any chance we can handle this? */
  295         if (mem_range_softc.mr_op == NULL)
  296                 return (EOPNOTSUPP);
  297 
  298         /* do we have any descriptors? */
  299         if (mem_range_softc.mr_ndesc == 0)
  300                 return (ENXIO);
  301 
  302         switch (cmd) {
  303         case MEMRANGE_GET:
  304                 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
  305                 if (nd > 0) {
  306                         md = (struct mem_range_desc *)
  307                                 malloc(nd * sizeof(struct mem_range_desc),
  308                                        M_MEMDESC, M_WAITOK);
  309                         error = mem_range_attr_get(md, &nd);
  310                         if (!error)
  311                                 error = copyout(md, mo->mo_desc, 
  312                                         nd * sizeof(struct mem_range_desc));
  313                         free(md, M_MEMDESC);
  314                 }
  315                 else
  316                         nd = mem_range_softc.mr_ndesc;
  317                 mo->mo_arg[0] = nd;
  318                 break;
  319                 
  320         case MEMRANGE_SET:
  321                 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
  322                                                     M_MEMDESC, M_WAITOK);
  323                 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
  324                 /* clamp description string */
  325                 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
  326                 if (error == 0)
  327                         error = mem_range_attr_set(md, &mo->mo_arg[0]);
  328                 free(md, M_MEMDESC);
  329                 break;
  330         }
  331         return (error);
  332 }
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