drivers/mtd/tests/mtd_readtest.c

   1 /*
   2  * Copyright (C) 2006-2008 Nokia Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; see the file COPYING. If not, write to the Free Software
  15  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16  *
  17  * Check MTD device read.
  18  *
  19  * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
  20  */
  21
  22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/err.h>
  28 #include <linux/mtd/mtd.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31
  32 static int dev = -EINVAL;
  33 module_param(dev, int, S_IRUGO);
  34 MODULE_PARM_DESC(dev, "MTD device number to use");
  35
  36 static struct mtd_info *mtd;
  37 static unsigned char *iobuf;
  38 static unsigned char *iobuf1;
  39 static unsigned char *bbt;
  40
  41 static int pgsize;
  42 static int ebcnt;
  43 static int pgcnt;
  44
  45 static int read_eraseblock_by_page(int ebnum)
  46 {
  47         size_t read;
  48         int i, ret, err = 0;
  49         loff_t addr = ebnum * mtd->erasesize;
  50         void *buf = iobuf;
  51         void *oobbuf = iobuf1;
  52
  53         for (i = 0; i < pgcnt; i++) {
  54                 memset(buf, 0 , pgsize);
  55                 ret = mtd_read(mtd, addr, pgsize, &read, buf);
  56                 if (ret == -EUCLEAN)
  57                         ret = 0;
  58                 if (ret || read != pgsize) {
  59                         pr_err("error: read failed at %#llx\n",
  60                                (long long)addr);
  61                         if (!err)
  62                                 err = ret;
  63                         if (!err)
  64                                 err = -EINVAL;
  65                 }
  66                 if (mtd->oobsize) {
  67                         struct mtd_oob_ops ops;
  68
  69                         ops.mode      = MTD_OPS_PLACE_OOB;
  70                         ops.len       = 0;
  71                         ops.retlen    = 0;
  72                         ops.ooblen    = mtd->oobsize;
  73                         ops.oobretlen = 0;
  74                         ops.ooboffs   = 0;
  75                         ops.datbuf    = NULL;
  76                         ops.oobbuf    = oobbuf;
  77                         ret = mtd_read_oob(mtd, addr, &ops);
  78                         if ((ret && !mtd_is_bitflip(ret)) ||
  79                                         ops.oobretlen != mtd->oobsize) {
  80                                 pr_err("error: read oob failed at "
  81                                                   "%#llx\n", (long long)addr);
  82                                 if (!err)
  83                                         err = ret;
  84                                 if (!err)
  85                                         err = -EINVAL;
  86                         }
  87                         oobbuf += mtd->oobsize;
  88                 }
  89                 addr += pgsize;
  90                 buf += pgsize;
  91         }
  92
  93         return err;
  94 }
  95
  96 static void dump_eraseblock(int ebnum)
  97 {
  98         int i, j, n;
  99         char line[128];
 100         int pg, oob;
 101
 102         pr_info("dumping eraseblock %d\n", ebnum);
 103         n = mtd->erasesize;
 104         for (i = 0; i < n;) {
 105                 char *p = line;
 106
 107                 p += sprintf(p, "%05x: ", i);
 108                 for (j = 0; j < 32 && i < n; j++, i++)
 109                         p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
 110                 printk(KERN_CRIT "%s\n", line);
 111                 cond_resched();
 112         }
 113         if (!mtd->oobsize)
 114                 return;
 115         pr_info("dumping oob from eraseblock %d\n", ebnum);
 116         n = mtd->oobsize;
 117         for (pg = 0, i = 0; pg < pgcnt; pg++)
 118                 for (oob = 0; oob < n;) {
 119                         char *p = line;
 120
 121                         p += sprintf(p, "%05x: ", i);
 122                         for (j = 0; j < 32 && oob < n; j++, oob++, i++)
 123                                 p += sprintf(p, "%02x",
 124                                              (unsigned int)iobuf1[i]);
 125                         printk(KERN_CRIT "%s\n", line);
 126                         cond_resched();
 127                 }
 128 }
 129
 130 static int is_block_bad(int ebnum)
 131 {
 132         loff_t addr = ebnum * mtd->erasesize;
 133         int ret;
 134
 135         ret = mtd_block_isbad(mtd, addr);
 136         if (ret)
 137                 pr_info("block %d is bad\n", ebnum);
 138         return ret;
 139 }
 140
 141 static int scan_for_bad_eraseblocks(void)
 142 {
 143         int i, bad = 0;
 144
 145         bbt = kzalloc(ebcnt, GFP_KERNEL);
 146         if (!bbt) {
 147                 pr_err("error: cannot allocate memory\n");
 148                 return -ENOMEM;
 149         }
 150
 151         if (!mtd_can_have_bb(mtd))
 152                 return 0;
 153
 154         pr_info("scanning for bad eraseblocks\n");
 155         for (i = 0; i < ebcnt; ++i) {
 156                 bbt[i] = is_block_bad(i) ? 1 : 0;
 157                 if (bbt[i])
 158                         bad += 1;
 159                 cond_resched();
 160         }
 161         pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
 162         return 0;
 163 }
 164
 165 static int __init mtd_readtest_init(void)
 166 {
 167         uint64_t tmp;
 168         int err, i;
 169
 170         printk(KERN_INFO "\n");
 171         printk(KERN_INFO "=================================================\n");
 172
 173         if (dev < 0) {
 174                 pr_info("Please specify a valid mtd-device via module parameter\n");
 175                 return -EINVAL;
 176         }
 177
 178         pr_info("MTD device: %d\n", dev);
 179
 180         mtd = get_mtd_device(NULL, dev);
 181         if (IS_ERR(mtd)) {
 182                 err = PTR_ERR(mtd);
 183                 pr_err("error: Cannot get MTD device\n");
 184                 return err;
 185         }
 186
 187         if (mtd->writesize == 1) {
 188                 pr_info("not NAND flash, assume page size is 512 "
 189                        "bytes.\n");
 190                 pgsize = 512;
 191         } else
 192                 pgsize = mtd->writesize;
 193
 194         tmp = mtd->size;
 195         do_div(tmp, mtd->erasesize);
 196         ebcnt = tmp;
 197         pgcnt = mtd->erasesize / pgsize;
 198
 199         pr_info("MTD device size %llu, eraseblock size %u, "
 200                "page size %u, count of eraseblocks %u, pages per "
 201                "eraseblock %u, OOB size %u\n",
 202                (unsigned long long)mtd->size, mtd->erasesize,
 203                pgsize, ebcnt, pgcnt, mtd->oobsize);
 204
 205         err = -ENOMEM;
 206         iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 207         if (!iobuf) {
 208                 pr_err("error: cannot allocate memory\n");
 209                 goto out;
 210         }
 211         iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
 212         if (!iobuf1) {
 213                 pr_err("error: cannot allocate memory\n");
 214                 goto out;
 215         }
 216
 217         err = scan_for_bad_eraseblocks();
 218         if (err)
 219                 goto out;
 220
 221         /* Read all eraseblocks 1 page at a time */
 222         pr_info("testing page read\n");
 223         for (i = 0; i < ebcnt; ++i) {
 224                 int ret;
 225
 226                 if (bbt[i])
 227                         continue;
 228                 ret = read_eraseblock_by_page(i);
 229                 if (ret) {
 230                         dump_eraseblock(i);
 231                         if (!err)
 232                                 err = ret;
 233                 }
 234                 cond_resched();
 235         }
 236
 237         if (err)
 238                 pr_info("finished with errors\n");
 239         else
 240                 pr_info("finished\n");
 241
 242 out:
 243
 244         kfree(iobuf);
 245         kfree(iobuf1);
 246         kfree(bbt);
 247         put_mtd_device(mtd);
 248         if (err)
 249                 pr_info("error %d occurred\n", err);
 250         printk(KERN_INFO "=================================================\n");
 251         return err;
 252 }
 253 module_init(mtd_readtest_init);
 254
 255 static void __exit mtd_readtest_exit(void)
 256 {
 257         return;
 258 }
 259 module_exit(mtd_readtest_exit);
 260
 261 MODULE_DESCRIPTION("Read test module");
 262 MODULE_AUTHOR("Adrian Hunter");
 263 MODULE_LICENSE("GPL");