kernel/drivers/mtd/tests/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 #include "mtd_test.h"
  33
  34 static int dev = -EINVAL;
  35 module_param(dev, int, S_IRUGO);
  36 MODULE_PARM_DESC(dev, "MTD device number to use");
  37
  38 static struct mtd_info *mtd;
  39 static unsigned char *iobuf;
  40 static unsigned char *iobuf1;
  41 static unsigned char *bbt;
  42
  43 static int pgsize;
  44 static int ebcnt;
  45 static int pgcnt;
  46
  47 static int read_eraseblock_by_page(int ebnum)
  48 {
  49         int i, ret, err = 0;
  50         loff_t addr = (loff_t)ebnum * mtd->erasesize;
  51         void *buf = iobuf;
  52         void *oobbuf = iobuf1;
  53
  54         for (i = 0; i < pgcnt; i++) {
  55                 memset(buf, 0 , pgsize);
  56                 ret = mtdtest_read(mtd, addr, pgsize, buf);
  57                 if (ret) {
  58                         if (!err)
  59                                 err = ret;
  60                 }
  61                 if (mtd->oobsize) {
  62                         struct mtd_oob_ops ops;
  63
  64                         ops.mode      = MTD_OPS_PLACE_OOB;
  65                         ops.len       = 0;
  66                         ops.retlen    = 0;
  67                         ops.ooblen    = mtd->oobsize;
  68                         ops.oobretlen = 0;
  69                         ops.ooboffs   = 0;
  70                         ops.datbuf    = NULL;
  71                         ops.oobbuf    = oobbuf;
  72                         ret = mtd_read_oob(mtd, addr, &ops);
  73                         if ((ret && !mtd_is_bitflip(ret)) ||
  74                                         ops.oobretlen != mtd->oobsize) {
  75                                 pr_err("error: read oob failed at "
  76                                                   "%#llx\n", (long long)addr);
  77                                 if (!err)
  78                                         err = ret;
  79                                 if (!err)
  80                                         err = -EINVAL;
  81                         }
  82                         oobbuf += mtd->oobsize;
  83                 }
  84                 addr += pgsize;
  85                 buf += pgsize;
  86         }
  87
  88         return err;
  89 }
  90
  91 static void dump_eraseblock(int ebnum)
  92 {
  93         int i, j, n;
  94         char line[128];
  95         int pg, oob;
  96
  97         pr_info("dumping eraseblock %d\n", ebnum);
  98         n = mtd->erasesize;
  99         for (i = 0; i < n;) {
 100                 char *p = line;
 101
 102                 p += sprintf(p, "%05x: ", i);
 103                 for (j = 0; j < 32 && i < n; j++, i++)
 104                         p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
 105                 printk(KERN_CRIT "%s\n", line);
 106                 cond_resched();
 107         }
 108         if (!mtd->oobsize)
 109                 return;
 110         pr_info("dumping oob from eraseblock %d\n", ebnum);
 111         n = mtd->oobsize;
 112         for (pg = 0, i = 0; pg < pgcnt; pg++)
 113                 for (oob = 0; oob < n;) {
 114                         char *p = line;
 115
 116                         p += sprintf(p, "%05x: ", i);
 117                         for (j = 0; j < 32 && oob < n; j++, oob++, i++)
 118                                 p += sprintf(p, "%02x",
 119                                              (unsigned int)iobuf1[i]);
 120                         printk(KERN_CRIT "%s\n", line);
 121                         cond_resched();
 122                 }
 123 }
 124
 125 static int __init mtd_readtest_init(void)
 126 {
 127         uint64_t tmp;
 128         int err, i;
 129
 130         printk(KERN_INFO "\n");
 131         printk(KERN_INFO "=================================================\n");
 132
 133         if (dev < 0) {
 134                 pr_info("Please specify a valid mtd-device via module parameter\n");
 135                 return -EINVAL;
 136         }
 137
 138         pr_info("MTD device: %d\n", dev);
 139
 140         mtd = get_mtd_device(NULL, dev);
 141         if (IS_ERR(mtd)) {
 142                 err = PTR_ERR(mtd);
 143                 pr_err("error: Cannot get MTD device\n");
 144                 return err;
 145         }
 146
 147         if (mtd->writesize == 1) {
 148                 pr_info("not NAND flash, assume page size is 512 "
 149                        "bytes.\n");
 150                 pgsize = 512;
 151         } else
 152                 pgsize = mtd->writesize;
 153
 154         tmp = mtd->size;
 155         do_div(tmp, mtd->erasesize);
 156         ebcnt = tmp;
 157         pgcnt = mtd->erasesize / pgsize;
 158
 159         pr_info("MTD device size %llu, eraseblock size %u, "
 160                "page size %u, count of eraseblocks %u, pages per "
 161                "eraseblock %u, OOB size %u\n",
 162                (unsigned long long)mtd->size, mtd->erasesize,
 163                pgsize, ebcnt, pgcnt, mtd->oobsize);
 164
 165         err = -ENOMEM;
 166         iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 167         if (!iobuf)
 168                 goto out;
 169         iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
 170         if (!iobuf1)
 171                 goto out;
 172
 173         bbt = kzalloc(ebcnt, GFP_KERNEL);
 174         if (!bbt)
 175                 goto out;
 176         err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
 177         if (err)
 178                 goto out;
 179
 180         /* Read all eraseblocks 1 page at a time */
 181         pr_info("testing page read\n");
 182         for (i = 0; i < ebcnt; ++i) {
 183                 int ret;
 184
 185                 if (bbt[i])
 186                         continue;
 187                 ret = read_eraseblock_by_page(i);
 188                 if (ret) {
 189                         dump_eraseblock(i);
 190                         if (!err)
 191                                 err = ret;
 192                 }
 193
 194                 ret = mtdtest_relax();
 195                 if (ret) {
 196                         err = ret;
 197                         goto out;
 198                 }
 199         }
 200
 201         if (err)
 202                 pr_info("finished with errors\n");
 203         else
 204                 pr_info("finished\n");
 205
 206 out:
 207
 208         kfree(iobuf);
 209         kfree(iobuf1);
 210         kfree(bbt);
 211         put_mtd_device(mtd);
 212         if (err)
 213                 pr_info("error %d occurred\n", err);
 214         printk(KERN_INFO "=================================================\n");
 215         return err;
 216 }
 217 module_init(mtd_readtest_init);
 218
 219 static void __exit mtd_readtest_exit(void)
 220 {
 221         return;
 222 }
 223 module_exit(mtd_readtest_exit);
 224
 225 MODULE_DESCRIPTION("Read test module");
 226 MODULE_AUTHOR("Adrian Hunter");
 227 MODULE_LICENSE("GPL");