MTD: tests: add mtd_readtest

A simple tests which reads whole MTD device one page at a time.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 253 insertions, 0 deletions

diff --git a/drivers/mtd/tests/mtd_readtest.c b/drivers/mtd/tests/mtd_readtest.c
new file mode 100644
index 000000000000..645e77fdc63d
--- /dev/null
+++ b/drivers/mtd/tests/mtd_readtest.c
@@ -0,0 +1,253 @@
+/*
+ * Copyright (C) 2006-2008 Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; see the file COPYING. If not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Check MTD device read.
+ *
+ * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/err.h>
+#include <linux/mtd/mtd.h>
+#include <linux/sched.h>
+
+#define PRINT_PREF KERN_INFO "mtd_readtest: "
+
+static int dev;
+module_param(dev, int, S_IRUGO);
+MODULE_PARM_DESC(dev, "MTD device number to use");
+
+static struct mtd_info *mtd;
+static unsigned char *iobuf;
+static unsigned char *iobuf1;
+static unsigned char *bbt;
+
+static int pgsize;
+static int ebcnt;
+static int pgcnt;
+
+static int read_eraseblock_by_page(int ebnum)
+{
+        size_t read = 0;
+        int i, ret, err = 0;
+        loff_t addr = ebnum * mtd->erasesize;
+        void *buf = iobuf;
+        void *oobbuf = iobuf1;
+
+        for (i = 0; i < pgcnt; i++) {
+                memset(buf, 0 , pgcnt);
+                ret = mtd->read(mtd, addr, pgsize, &read, buf);
+                if (ret == -EUCLEAN)
+                        ret = 0;
+                if (ret || read != pgsize) {
+                        printk(PRINT_PREF "error: read failed at %#llx\n",
+                               (long long)addr);
+                        if (!err)
+                                err = ret;
+                        if (!err)
+                                err = -EINVAL;
+                }
+                if (mtd->oobsize) {
+                        struct mtd_oob_ops ops;
+
+                        ops.mode      = MTD_OOB_PLACE;
+                        ops.len       = 0;
+                        ops.retlen    = 0;
+                        ops.ooblen    = mtd->oobsize;
+                        ops.oobretlen = 0;
+                        ops.ooboffs   = 0;
+                        ops.datbuf    = 0;
+                        ops.oobbuf    = oobbuf;
+                        ret = mtd->read_oob(mtd, addr, &ops);
+                        if (ret || ops.oobretlen != mtd->oobsize) {
+                                printk(PRINT_PREF "error: read oob failed at "
+                                                  "%#llx\n", (long long)addr);
+                                if (!err)
+                                        err = ret;
+                                if (!err)
+                                        err = -EINVAL;
+                        }
+                        oobbuf += mtd->oobsize;
+                }
+                addr += pgsize;
+                buf += pgsize;
+        }
+
+        return err;
+}
+
+static void dump_eraseblock(int ebnum)
+{
+        int i, j, n;
+        char line[128];
+        int pg, oob;
+
+        printk(PRINT_PREF "dumping eraseblock %d\n", ebnum);
+        n = mtd->erasesize;
+        for (i = 0; i < n;) {
+                char *p = line;
+
+                p += sprintf(p, "%05x: ", i);
+                for (j = 0; j < 32 && i < n; j++, i++)
+                        p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
+                printk(KERN_CRIT "%s\n", line);
+                cond_resched();
+        }
+        if (!mtd->oobsize)
+                return;
+        printk(PRINT_PREF "dumping oob from eraseblock %d\n", ebnum);
+        n = mtd->oobsize;
+        for (pg = 0, i = 0; pg < pgcnt; pg++)
+                for (oob = 0; oob < n;) {
+                        char *p = line;
+
+                        p += sprintf(p, "%05x: ", i);
+                        for (j = 0; j < 32 && oob < n; j++, oob++, i++)
+                                p += sprintf(p, "%02x",
+                                             (unsigned int)iobuf1[i]);
+                        printk(KERN_CRIT "%s\n", line);
+                        cond_resched();
+                }
+}
+
+static int is_block_bad(int ebnum)
+{
+        loff_t addr = ebnum * mtd->erasesize;
+        int ret;
+
+        ret = mtd->block_isbad(mtd, addr);
+        if (ret)
+                printk(PRINT_PREF "block %d is bad\n", ebnum);
+        return ret;
+}
+
+static int scan_for_bad_eraseblocks(void)
+{
+        int i, bad = 0;
+
+        bbt = kmalloc(ebcnt, GFP_KERNEL);
+        if (!bbt) {
+                printk(PRINT_PREF "error: cannot allocate memory\n");
+                return -ENOMEM;
+        }
+        memset(bbt, 0 , ebcnt);
+
+        printk(PRINT_PREF "scanning for bad eraseblocks\n");
+        for (i = 0; i < ebcnt; ++i) {
+                bbt[i] = is_block_bad(i) ? 1 : 0;
+                if (bbt[i])
+                        bad += 1;
+                cond_resched();
+        }
+        printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
+        return 0;
+}
+
+static int __init mtd_readtest_init(void)
+{
+        uint64_t tmp;
+        int err, i;
+
+        printk(KERN_INFO "\n");
+        printk(KERN_INFO "=================================================\n");
+        printk(PRINT_PREF "MTD device: %d\n", dev);
+
+        mtd = get_mtd_device(NULL, dev);
+        if (IS_ERR(mtd)) {
+                err = PTR_ERR(mtd);
+                printk(PRINT_PREF "error: Cannot get MTD device\n");
+                return err;
+        }
+
+        if (mtd->writesize == 1) {
+                printk(PRINT_PREF "not NAND flash, assume page size is 512 "
+                       "bytes.\n");
+                pgsize = 512;
+        } else
+                pgsize = mtd->writesize;
+
+        tmp = mtd->size;
+        do_div(tmp, mtd->erasesize);
+        ebcnt = tmp;
+        pgcnt = mtd->erasesize / mtd->writesize;
+
+        printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
+               "page size %u, count of eraseblocks %u, pages per "
+               "eraseblock %u, OOB size %u\n",
+               (unsigned long long)mtd->size, mtd->erasesize,
+               pgsize, ebcnt, pgcnt, mtd->oobsize);
+
+        err = -ENOMEM;
+        iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
+        if (!iobuf) {
+                printk(PRINT_PREF "error: cannot allocate memory\n");
+                goto out;
+        }
+        iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
+        if (!iobuf1) {
+                printk(PRINT_PREF "error: cannot allocate memory\n");
+                goto out;
+        }
+
+        err = scan_for_bad_eraseblocks();
+        if (err)
+                goto out;
+
+        /* Read all eraseblocks 1 page at a time */
+        printk(PRINT_PREF "testing page read\n");
+        for (i = 0; i < ebcnt; ++i) {
+                int ret;
+
+                if (bbt[i])
+                        continue;
+                ret = read_eraseblock_by_page(i);
+                if (ret) {
+                        dump_eraseblock(i);
+                        if (!err)
+                                err = ret;
+                }
+                cond_resched();
+        }
+
+        if (err)
+                printk(PRINT_PREF "finished with errors\n");
+        else
+                printk(PRINT_PREF "finished\n");
+
+out:
+
+        kfree(iobuf);
+        kfree(iobuf1);
+        kfree(bbt);
+        put_mtd_device(mtd);
+        if (err)
+                printk(PRINT_PREF "error %d occurred\n", err);
+        printk(KERN_INFO "=================================================\n");
+        return err;
+}
+module_init(mtd_readtest_init);
+
+static void __exit mtd_readtest_exit(void)
+{
+        return;
+}
+module_exit(mtd_readtest_exit);
+
+MODULE_DESCRIPTION("Read test module");
+MODULE_AUTHOR("Adrian Hunter");
+MODULE_LICENSE("GPL");