geom_flashmap.c

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