stand/libofw/ofw_disk.c

   1 /*-
   2  * Copyright (C) 2000 Benno Rice.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 /*
  27  * Disk I/O routines using Open Firmware
  28  */
  29
  30 #include <sys/param.h>
  31
  32 #include <netinet/in.h>
  33
  34 #include <machine/stdarg.h>
  35
  36 #include <stand.h>
  37 #include <sys/disk.h>
  38
  39 #include "disk.h"
  40 #include "libofw.h"
  41
  42 static int      ofwd_init(void);
  43 static int      ofwd_strategy(void *devdata, int flag, daddr_t dblk,
  44                     size_t size, char *buf, size_t *rsize);
  45 static int      ofwd_open(struct open_file *f, ...);
  46 static int      ofwd_close(struct open_file *f);
  47 static int      ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
  48 static int      ofwd_print(int verbose);
  49 static char *   ofwd_fmtdev(struct devdesc *);
  50 static int      ofwd_parsedev(struct devdesc **, const char *, const char **);
  51 static bool     ofwd_match(struct devsw *, const char *);
  52
  53 struct devsw ofwdisk = {
  54         .dv_name = "block",
  55         .dv_type = DEVT_OFDISK,
  56         .dv_init = ofwd_init,
  57         .dv_strategy = ofwd_strategy,
  58         .dv_open = ofwd_open,
  59         .dv_close = ofwd_close,
  60         .dv_ioctl = ofwd_ioctl,
  61         .dv_print = ofwd_print,
  62         .dv_cleanup = nullsys,
  63         .dv_match = ofwd_match,
  64         .dv_fmtdev = ofwd_fmtdev,
  65         .dv_parsedev = ofwd_parsedev,
  66 };
  67
  68 /*
  69  * We're not guaranteed to be able to open a device more than once and there
  70  * is no OFW standard method to determine whether a device is already opened.
  71  * Opening a device multiple times simultaneously happens to work with most
  72  * OFW block device drivers but triggers a trap with at least the driver for
  73  * the on-board controllers of Sun Fire V100 and Ultra 1.  Upper layers and MI
  74  * code expect to be able to open a device more than once however.  Given that
  75  * different partitions of the same device might be opened at the same time as
  76  * done by ZFS, we can't generally just keep track of the opened devices and
  77  * reuse the instance handle when asked to open an already opened device.  So
  78  * the best we can do is to cache the lastly used device path and close and
  79  * open devices in ofwd_strategy() as needed.
  80  */
  81 static struct ofw_devdesc *kdp;
  82
  83 static int
  84 ofwd_init(void)
  85 {
  86
  87         return (0);
  88 }
  89
  90 static int
  91 ofwd_strategy(void *devdata, int flag __unused, daddr_t dblk, size_t size,
  92     char *buf, size_t *rsize)
  93 {
  94         struct ofw_devdesc *dp = (struct ofw_devdesc *)devdata;
  95         daddr_t pos;
  96         int n;
  97
  98         if (dp != kdp) {
  99                 if (kdp != NULL) {
 100 #if !defined(__powerpc__)
 101                         OF_close(kdp->d_handle);
 102 #endif
 103                         kdp = NULL;
 104                 }
 105                 if ((dp->d_handle = OF_open(dp->d_path)) == -1)
 106                         return (ENOENT);
 107                 kdp = dp;
 108         }
 109
 110         pos = dblk * 512;
 111         do {
 112                 if (OF_seek(dp->d_handle, pos) < 0)
 113                         return (EIO);
 114                 n = OF_read(dp->d_handle, buf, size);
 115                 if (n < 0 && n != -2)
 116                         return (EIO);
 117         } while (n == -2);
 118         *rsize = size;
 119         return (0);
 120 }
 121
 122 static int
 123 ofwd_open(struct open_file *f, ...)
 124 {
 125         struct ofw_devdesc *dp;
 126         va_list vl;
 127
 128         va_start(vl, f);
 129         dp = va_arg(vl, struct ofw_devdesc *);
 130         va_end(vl);
 131
 132         if (dp != kdp) {
 133                 if (kdp != NULL) {
 134                         OF_close(kdp->d_handle);
 135                         kdp = NULL;
 136                 }
 137                 if ((dp->d_handle = OF_open(dp->d_path)) == -1) {
 138                         printf("%s: Could not open %s\n", __func__,
 139                             dp->d_path);
 140                         return (ENOENT);
 141                 }
 142                 kdp = dp;
 143         }
 144         return (0);
 145 }
 146
 147 static int
 148 ofwd_close(struct open_file *f)
 149 {
 150         struct ofw_devdesc *dev = f->f_devdata;
 151
 152         if (dev == kdp) {
 153 #if !defined(__powerpc__)
 154                 OF_close(dev->d_handle);
 155 #endif
 156                 kdp = NULL;
 157         }
 158         return (0);
 159 }
 160
 161 static int
 162 ofwd_ioctl(struct open_file *f, u_long cmd, void *data)
 163 {
 164         struct ofw_devdesc *dev = f->f_devdata;
 165         int block_size;
 166         unsigned int n;
 167
 168         switch (cmd) {
 169         case DIOCGSECTORSIZE:
 170                 block_size = OF_block_size(dev->d_handle);
 171                 *(u_int *)data = block_size;
 172                 break;
 173         case DIOCGMEDIASIZE:
 174                 block_size = OF_block_size(dev->d_handle);
 175                 n = OF_blocks(dev->d_handle);
 176                 *(uint64_t *)data = ((uint64_t)n * block_size);
 177                 break;
 178         default:
 179                 return (ENOTTY);
 180         }
 181         return (0);
 182 }
 183
 184 static int
 185 ofwd_print(int verbose __unused)
 186 {
 187         uintmax_t block_size, n;
 188         int ret;
 189         char line[80];
 190
 191         /*
 192          * We don't have a list of devices since we don't parse the whole OFW
 193          * tree to find them. Instead, if we have an open device print info
 194          * about it. Otherwise say we can't. Makes lsdev nicer.
 195          */
 196         if ((ret = pager_output("block devices:\n")) != 0)
 197                 return (ret);
 198         if (kdp != NULL) {
 199                 block_size = OF_block_size(kdp->d_handle);
 200                 n = OF_blocks(kdp->d_handle);
 201                 snprintf(line, sizeof(line),
 202                     "    %s:   OFW block device (%ju X %ju): %ju bytes\n",
 203                     kdp->d_path, n, block_size, n * block_size);
 204                 if ((ret = pager_output(line)) != 0)
 205                         return (ret);
 206         } else {
 207                 if ((ret = pager_output("  none are open, so no info\n")) != 0)
 208                         return (ret);
 209         }
 210
 211         return (0);
 212 }
 213
 214
 215 static bool
 216 ofwd_match(struct devsw *devsw, const char *devspec)
 217 {
 218         const char *path;
 219
 220         return (ofw_path_to_handle(devspec, devsw->dv_name, &path) != -1);
 221 }
 222
 223 static char *
 224 ofwd_fmtdev(struct devdesc *idev)
 225 {
 226         struct ofw_devdesc *dev = (struct ofw_devdesc *)idev;
 227
 228         return (dev->d_path);
 229 }
 230
 231 static int
 232 ofwd_parsedev(struct devdesc **dev, const char *devspec, const char **path)
 233 {
 234         return (ofw_common_parsedev(dev, devspec, path, ofwdisk.dv_name));
 235 }