diff options
Diffstat (limited to 'drivers/mtd/tests/mtd_stresstest.c')
| -rw-r--r-- | drivers/mtd/tests/mtd_stresstest.c | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/drivers/mtd/tests/mtd_stresstest.c b/drivers/mtd/tests/mtd_stresstest.c deleted file mode 100644 index 531625fc925..00000000000 --- a/drivers/mtd/tests/mtd_stresstest.c +++ /dev/null @@ -1,334 +0,0 @@ -/* - * 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> - */ - -#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> - -#define PRINT_PREF KERN_INFO "mtd_stresstest: " - -static int dev; -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 unsigned long next = 1; - -static inline unsigned int simple_rand(void) -{ - next = next * 1103515245 + 12345; - return (unsigned int)((next / 65536) % 32768); -} - -static inline void simple_srand(unsigned long seed) -{ - next = seed; -} - -static int rand_eb(void) -{ - int eb; - -again: - if (ebcnt < 32768) - eb = simple_rand(); - else - eb = (simple_rand() << 15) | simple_rand(); - /* 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) -{ - int offs; - - if (bufsize < 32768) - offs = simple_rand(); - else - offs = (simple_rand() << 15) | simple_rand(); - offs %= bufsize; - return offs; -} - -static int rand_len(int offs) -{ - int len; - - if (bufsize < 32768) - len = simple_rand(); - else - len = (simple_rand() << 15) | simple_rand(); - len %= (bufsize - offs); - return len; -} - -static int erase_eraseblock(int ebnum) -{ - int err; - struct erase_info ei; - loff_t addr = ebnum * mtd->erasesize; - - memset(&ei, 0, sizeof(struct erase_info)); - ei.mtd = mtd; - ei.addr = addr; - ei.len = mtd->erasesize; - - err = mtd->erase(mtd, &ei); - if (unlikely(err)) { - printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum); - return err; - } - - if (unlikely(ei.state == MTD_ERASE_FAILED)) { - printk(PRINT_PREF "some erase error occurred at EB %d\n", - ebnum); - return -EIO; - } - - return 0; -} - -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 do_read(void) -{ - size_t read = 0; - int eb = rand_eb(); - int offs = rand_offs(); - int len = rand_len(offs), err; - loff_t addr; - - if (bbt[eb + 1]) { - if (offs >= mtd->erasesize) - offs -= mtd->erasesize; - if (offs + len > mtd->erasesize) - len = mtd->erasesize - offs; - } - addr = eb * mtd->erasesize + offs; - err = mtd->read(mtd, addr, len, &read, readbuf); - if (err == -EUCLEAN) - err = 0; - if (unlikely(err || read != len)) { - printk(PRINT_PREF "error: read failed at 0x%llx\n", - (long long)addr); - if (!err) - err = -EINVAL; - return err; - } - return 0; -} - -static int do_write(void) -{ - int eb = rand_eb(), offs, err, len; - size_t written = 0; - loff_t addr; - - offs = offsets[eb]; - if (offs >= mtd->erasesize) { - err = erase_eraseblock(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 = erase_eraseblock(eb + 1); - if (err) - return err; - offsets[eb + 1] = 0; - } - } - addr = eb * mtd->erasesize + offs; - err = mtd->write(mtd, addr, len, &written, writebuf); - if (unlikely(err || written != len)) { - printk(PRINT_PREF "error: write failed at 0x%llx\n", - (long long)addr); - if (!err) - err = -EINVAL; - 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 (simple_rand() & 1) - return do_read(); - else - return do_write(); -} - -static int scan_for_bad_eraseblocks(void) -{ - int i, bad = 0; - - bbt = kzalloc(ebcnt, GFP_KERNEL); - if (!bbt) { - printk(PRINT_PREF "error: cannot allocate memory\n"); - return -ENOMEM; - } - - /* NOR flash does not implement block_isbad */ - if (mtd->block_isbad == NULL) - return 0; - - 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_stresstest_init(void) -{ - int err; - int i, op; - uint64_t tmp; - - 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 / pgsize; - - 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); - - /* 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) { - printk(PRINT_PREF "error: cannot allocate memory\n"); - goto out; - } - for (i = 0; i < ebcnt; i++) - offsets[i] = mtd->erasesize; - simple_srand(current->pid); - for (i = 0; i < bufsize; i++) - writebuf[i] = simple_rand(); - - err = scan_for_bad_eraseblocks(); - if (err) - goto out; - - /* Do operations */ - printk(PRINT_PREF "doing operations\n"); - for (op = 0; op < count; op++) { - if ((op & 1023) == 0) - printk(PRINT_PREF "%d operations done\n", op); - err = do_operation(); - if (err) - goto out; - cond_resched(); - } - printk(PRINT_PREF "finished, %d operations done\n", op); - -out: - kfree(offsets); - kfree(bbt); - vfree(writebuf); - vfree(readbuf); - put_mtd_device(mtd); - if (err) - printk(PRINT_PREF "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"); |