| /* |
| * 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 (mtd_is_bitflip(err)) |
| 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"); |