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- /*
- * 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.
- *
- * Test random reads, writes and erases on MTD device.
- *
- * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/moduleparam.h>
- #include <linux/err.h>
- #include <linux/mtd/mtd.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <linux/vmalloc.h>
- #include <linux/random.h>
- #include "mtd_test.h"
- static int dev = -EINVAL;
- module_param(dev, int, S_IRUGO);
- MODULE_PARM_DESC(dev, "MTD device number to use");
- static int count = 10000;
- module_param(count, int, S_IRUGO);
- MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)");
- static struct mtd_info *mtd;
- static unsigned char *writebuf;
- static unsigned char *readbuf;
- static unsigned char *bbt;
- static int *offsets;
- static int pgsize;
- static int bufsize;
- static int ebcnt;
- static int pgcnt;
- static int rand_eb(void)
- {
- unsigned int eb;
- again:
- eb = prandom_u32();
- /* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
- eb %= (ebcnt - 1);
- if (bbt[eb])
- goto again;
- return eb;
- }
- static int rand_offs(void)
- {
- unsigned int offs;
- offs = prandom_u32();
- offs %= bufsize;
- return offs;
- }
- static int rand_len(int offs)
- {
- unsigned int len;
- len = prandom_u32();
- len %= (bufsize - offs);
- return len;
- }
- static int do_read(void)
- {
- int eb = rand_eb();
- int offs = rand_offs();
- int len = rand_len(offs);
- loff_t addr;
- if (bbt[eb + 1]) {
- if (offs >= mtd->erasesize)
- offs -= mtd->erasesize;
- if (offs + len > mtd->erasesize)
- len = mtd->erasesize - offs;
- }
- addr = (loff_t)eb * mtd->erasesize + offs;
- return mtdtest_read(mtd, addr, len, readbuf);
- }
- static int do_write(void)
- {
- int eb = rand_eb(), offs, err, len;
- loff_t addr;
- offs = offsets[eb];
- if (offs >= mtd->erasesize) {
- err = mtdtest_erase_eraseblock(mtd, eb);
- if (err)
- return err;
- offs = offsets[eb] = 0;
- }
- len = rand_len(offs);
- len = ((len + pgsize - 1) / pgsize) * pgsize;
- if (offs + len > mtd->erasesize) {
- if (bbt[eb + 1])
- len = mtd->erasesize - offs;
- else {
- err = mtdtest_erase_eraseblock(mtd, eb + 1);
- if (err)
- return err;
- offsets[eb + 1] = 0;
- }
- }
- addr = (loff_t)eb * mtd->erasesize + offs;
- err = mtdtest_write(mtd, addr, len, writebuf);
- if (unlikely(err))
- return err;
- offs += len;
- while (offs > mtd->erasesize) {
- offsets[eb++] = mtd->erasesize;
- offs -= mtd->erasesize;
- }
- offsets[eb] = offs;
- return 0;
- }
- static int do_operation(void)
- {
- if (prandom_u32() & 1)
- return do_read();
- else
- return do_write();
- }
- static int __init mtd_stresstest_init(void)
- {
- int err;
- int i, op;
- uint64_t tmp;
- printk(KERN_INFO "\n");
- printk(KERN_INFO "=================================================\n");
- if (dev < 0) {
- pr_info("Please specify a valid mtd-device via module parameter\n");
- pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
- return -EINVAL;
- }
- pr_info("MTD device: %d\n", dev);
- mtd = get_mtd_device(NULL, dev);
- if (IS_ERR(mtd)) {
- err = PTR_ERR(mtd);
- pr_err("error: cannot get MTD device\n");
- return err;
- }
- if (mtd->writesize == 1) {
- pr_info("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 / pgsize;
- pr_info("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);
- if (ebcnt < 2) {
- pr_err("error: need at least 2 eraseblocks\n");
- err = -ENOSPC;
- goto out_put_mtd;
- }
- /* Read or write up 2 eraseblocks at a time */
- bufsize = mtd->erasesize * 2;
- err = -ENOMEM;
- readbuf = vmalloc(bufsize);
- writebuf = vmalloc(bufsize);
- offsets = kmalloc(ebcnt * sizeof(int), GFP_KERNEL);
- if (!readbuf || !writebuf || !offsets)
- goto out;
- for (i = 0; i < ebcnt; i++)
- offsets[i] = mtd->erasesize;
- prandom_bytes(writebuf, bufsize);
- bbt = kzalloc(ebcnt, GFP_KERNEL);
- if (!bbt)
- goto out;
- err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
- if (err)
- goto out;
- /* Do operations */
- pr_info("doing operations\n");
- for (op = 0; op < count; op++) {
- if ((op & 1023) == 0)
- pr_info("%d operations done\n", op);
- err = do_operation();
- if (err)
- goto out;
- err = mtdtest_relax();
- if (err)
- goto out;
- }
- pr_info("finished, %d operations done\n", op);
- out:
- kfree(offsets);
- kfree(bbt);
- vfree(writebuf);
- vfree(readbuf);
- out_put_mtd:
- put_mtd_device(mtd);
- if (err)
- pr_info("error %d occurred\n", err);
- printk(KERN_INFO "=================================================\n");
- return err;
- }
- module_init(mtd_stresstest_init);
- static void __exit mtd_stresstest_exit(void)
- {
- return;
- }
- module_exit(mtd_stresstest_exit);
- MODULE_DESCRIPTION("Stress test module");
- MODULE_AUTHOR("Adrian Hunter");
- MODULE_LICENSE("GPL");
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