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author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-12-08 13:36:47 +0200 |
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committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-12-08 13:56:14 +0200 |
commit | 7163cea15f7b362795b858e7c130cd617aecc0aa (patch) | |
tree | 7e21e948c3ab1ef98d3c7b9c40d942321fc4a42e /drivers | |
parent | 72069be936028ff236a6f783cb9a57abc5da7f41 (diff) | |
download | kernel_samsung_smdk4412-7163cea15f7b362795b858e7c130cd617aecc0aa.zip kernel_samsung_smdk4412-7163cea15f7b362795b858e7c130cd617aecc0aa.tar.gz kernel_samsung_smdk4412-7163cea15f7b362795b858e7c130cd617aecc0aa.tar.bz2 |
MTD: tests: add mtd_stresstest
This test just performs random operations on random eraseblocks.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/mtd/tests/mtd_stresstest.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/drivers/mtd/tests/mtd_stresstest.c b/drivers/mtd/tests/mtd_stresstest.c new file mode 100644 index 0000000..6392047 --- /dev/null +++ b/drivers/mtd/tests/mtd_stresstest.c @@ -0,0 +1,330 @@ +/* + * 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/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 = 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_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 / 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); + + /* 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"); |