geom_flashmap.c

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    1 /*-
    2  * Copyright (c) 2012 Semihalf
    3  * Copyright (c) 2009 Jakub Klama <jakub.klama@uj.edu.pl>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/lock.h>
   36 #include <sys/mutex.h>
   37 #include <sys/proc.h>
   38 #include <sys/slicer.h>
   39 
   40 #include <geom/geom.h>
   41 #include <geom/geom_slice.h>
   42 #include <geom/geom_disk.h>
   43 
   44 #include <dev/nand/nand_dev.h>
   45 
   46 #define FLASHMAP_CLASS_NAME "Flashmap"
   47 
   48 struct g_flashmap_slice {
   49         off_t           sl_start;
   50         off_t           sl_end;
   51         const char      *sl_name;
   52 
   53         STAILQ_ENTRY(g_flashmap_slice) sl_link;
   54 };
   55 
   56 STAILQ_HEAD(g_flashmap_head, g_flashmap_slice);
   57 
   58 static struct {
   59         const char      *type;
   60         flash_slicer_t  slicer;
   61 } g_flashmap_slicers[] = {
   62         { "NAND::device",       NULL },
   63         { "CFI::device",        NULL },
   64         { "SPI::device",        NULL },
   65         { "MMC::device",        NULL }
   66 };
   67 
   68 static g_ioctl_t g_flashmap_ioctl;
   69 static g_taste_t g_flashmap_taste;
   70 
   71 static int g_flashmap_load(device_t dev, struct g_provider *pp,
   72     flash_slicer_t slicer, struct g_flashmap_head *head);
   73 static int g_flashmap_modify(struct g_geom *gp, const char *devname,
   74     int secsize, struct g_flashmap_head *slices);
   75 static void g_flashmap_print(struct g_flashmap_slice *slice);
   76 
   77 MALLOC_DECLARE(M_FLASHMAP);
   78 MALLOC_DEFINE(M_FLASHMAP, "geom_flashmap", "GEOM flash memory slicer class");
   79 
   80 static void
   81 g_flashmap_print(struct g_flashmap_slice *slice)
   82 {
   83 
   84         printf("%08jx-%08jx: %s (%juKB)\n", (uintmax_t)slice->sl_start,
   85             (uintmax_t)slice->sl_end, slice->sl_name,
   86             (uintmax_t)(slice->sl_end - slice->sl_start) / 1024);
   87 }
   88 
   89 static int
   90 g_flashmap_modify(struct g_geom *gp, const char *devname, int secsize,
   91     struct g_flashmap_head *slices)
   92 {
   93         struct g_flashmap_slice *slice;
   94         int i, error;
   95 
   96         g_topology_assert();
   97 
   98         i = 0;
   99         STAILQ_FOREACH(slice, slices, sl_link) {
  100                 if (bootverbose) {
  101                         printf("%s: slice ", devname);
  102                         g_flashmap_print(slice);
  103                 }
  104 
  105                 error = g_slice_config(gp, i++, G_SLICE_CONFIG_CHECK,
  106                     slice->sl_start,
  107                     slice->sl_end - slice->sl_start + 1,
  108                     secsize, FLASH_SLICES_FMT, gp->name, slice->sl_name);
  109 
  110                 if (error)
  111                         return (error);
  112         }
  113 
  114         i = 0;
  115         STAILQ_FOREACH(slice, slices, sl_link) {
  116                 error = g_slice_config(gp, i++, G_SLICE_CONFIG_SET,
  117                     slice->sl_start,
  118                     slice->sl_end - slice->sl_start + 1,
  119                     secsize, "%ss.%s", gp->name, slice->sl_name);
  120 
  121                 if (error)
  122                         return (error);
  123         }
  124 
  125         return (0);
  126 }
  127 
  128 static int
  129 g_flashmap_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag,
  130     struct thread *td)
  131 {
  132         struct g_consumer *cp;
  133         struct g_geom *gp;
  134 
  135         if (cmd != NAND_IO_GET_CHIP_PARAM)
  136                 return (ENOIOCTL);
  137 
  138         cp = LIST_FIRST(&pp->geom->consumer);
  139         if (cp == NULL)
  140                 return (ENOIOCTL);
  141         gp = cp->provider->geom;
  142         if (gp->ioctl == NULL)
  143                 return (ENOIOCTL);
  144 
  145         return (gp->ioctl(cp->provider, cmd, data, fflag, td));
  146 }
  147 
  148 static struct g_geom *
  149 g_flashmap_taste(struct g_class *mp, struct g_provider *pp, int flags)
  150 {
  151         struct g_geom *gp;
  152         struct g_consumer *cp;
  153         struct g_flashmap_head head;
  154         struct g_flashmap_slice *slice, *slice_temp;
  155         flash_slicer_t slicer;
  156         device_t dev;
  157         int i, size;
  158 
  159         g_trace(G_T_TOPOLOGY, "flashmap_taste(%s,%s)", mp->name, pp->name);
  160         g_topology_assert();
  161 
  162         if (flags == G_TF_NORMAL &&
  163             strcmp(pp->geom->class->name, G_DISK_CLASS_NAME) != 0)
  164                 return (NULL);
  165 
  166         gp = g_slice_new(mp, FLASH_SLICES_MAX_NUM, pp, &cp, NULL, 0, NULL);
  167         if (gp == NULL)
  168                 return (NULL);
  169 
  170         STAILQ_INIT(&head);
  171 
  172         do {
  173                 slicer = NULL;
  174                 for (i = 0; i < nitems(g_flashmap_slicers); i++) {
  175                         size = sizeof(device_t);
  176                         if (g_io_getattr(g_flashmap_slicers[i].type, cp,
  177                             &size, &dev) == 0) {
  178                                 slicer = g_flashmap_slicers[i].slicer;
  179                                 break;
  180                         }
  181                 }
  182                 if (slicer == NULL)
  183                         break;
  184 
  185                 if (g_flashmap_load(dev, pp, slicer, &head) == 0)
  186                         break;
  187 
  188                 g_flashmap_modify(gp, cp->provider->name,
  189                     cp->provider->sectorsize, &head);
  190         } while (0);
  191 
  192         g_access(cp, -1, 0, 0);
  193 
  194         STAILQ_FOREACH_SAFE(slice, &head, sl_link, slice_temp)
  195                 free(slice, M_FLASHMAP);
  196 
  197         if (LIST_EMPTY(&gp->provider)) {
  198                 g_slice_spoiled(cp);
  199                 return (NULL);
  200         }
  201         return (gp);
  202 }
  203 
  204 static int
  205 g_flashmap_load(device_t dev, struct g_provider *pp, flash_slicer_t slicer,
  206     struct g_flashmap_head *head)
  207 {
  208         struct flash_slice *slices;
  209         struct g_flashmap_slice *slice;
  210         int i, nslices = 0;
  211 
  212         slices = malloc(sizeof(struct flash_slice) * FLASH_SLICES_MAX_NUM,
  213             M_FLASHMAP, M_WAITOK | M_ZERO);
  214         if (slicer(dev, pp->name, slices, &nslices) == 0) {
  215                 for (i = 0; i < nslices; i++) {
  216                         slice = malloc(sizeof(struct g_flashmap_slice),
  217                             M_FLASHMAP, M_WAITOK);
  218 
  219                         slice->sl_name = slices[i].label;
  220                         slice->sl_start = slices[i].base;
  221                         slice->sl_end = slices[i].base + slices[i].size - 1;
  222 
  223                         STAILQ_INSERT_TAIL(head, slice, sl_link);
  224                 }
  225         }
  226 
  227         free(slices, M_FLASHMAP);
  228         return (nslices);
  229 }
  230 
  231 void flash_register_slicer(flash_slicer_t slicer, u_int type, bool force)
  232 {
  233 
  234         DROP_GIANT();
  235         g_topology_lock();
  236         if (g_flashmap_slicers[type].slicer == NULL || force == TRUE)
  237                 g_flashmap_slicers[type].slicer = slicer;
  238         g_topology_unlock();
  239         PICKUP_GIANT();
  240 }
  241 
  242 static struct g_class g_flashmap_class = {
  243         .name = FLASHMAP_CLASS_NAME,
  244         .version = G_VERSION,
  245         .taste = g_flashmap_taste,
  246         .ioctl = g_flashmap_ioctl,
  247 };
  248 
  249 DECLARE_GEOM_CLASS(g_flashmap_class, g_flashmap);
  250 MODULE_VERSION(g_flashmap, 0);

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FreeBSD/Linux Kernel Cross Reference sys/geom/geom_flashmap.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_flashmap.c