| /* |
| * Copyright (C) 2006-2007 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 sub-page read and write 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> |
| |
| #define PRINT_PREF KERN_INFO "mtd_subpagetest: " |
| |
| static int dev = -EINVAL; |
| module_param(dev, int, S_IRUGO); |
| MODULE_PARM_DESC(dev, "MTD device number to use"); |
| |
| static struct mtd_info *mtd; |
| static unsigned char *writebuf; |
| static unsigned char *readbuf; |
| static unsigned char *bbt; |
| |
| static int subpgsize; |
| static int bufsize; |
| static int ebcnt; |
| static int pgcnt; |
| static int errcnt; |
| 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 void set_random_data(unsigned char *buf, size_t len) |
| { |
| size_t i; |
| |
| for (i = 0; i < len; ++i) |
| buf[i] = simple_rand(); |
| } |
| |
| static inline void clear_data(unsigned char *buf, size_t len) |
| { |
| memset(buf, 0, 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 (err) { |
| printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum); |
| return err; |
| } |
| |
| if (ei.state == MTD_ERASE_FAILED) { |
| printk(PRINT_PREF "some erase error occurred at EB %d\n", |
| ebnum); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int erase_whole_device(void) |
| { |
| int err; |
| unsigned int i; |
| |
| printk(PRINT_PREF "erasing whole device\n"); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = erase_eraseblock(i); |
| if (err) |
| return err; |
| cond_resched(); |
| } |
| printk(PRINT_PREF "erased %u eraseblocks\n", i); |
| return 0; |
| } |
| |
| static int write_eraseblock(int ebnum) |
| { |
| size_t written = 0; |
| int err = 0; |
| loff_t addr = ebnum * mtd->erasesize; |
| |
| set_random_data(writebuf, subpgsize); |
| err = mtd->write(mtd, addr, subpgsize, &written, writebuf); |
| if (unlikely(err || written != subpgsize)) { |
| printk(PRINT_PREF "error: write failed at %#llx\n", |
| (long long)addr); |
| if (written != subpgsize) { |
| printk(PRINT_PREF " write size: %#x\n", subpgsize); |
| printk(PRINT_PREF " written: %#zx\n", written); |
| } |
| return err ? err : -1; |
| } |
| |
| addr += subpgsize; |
| |
| set_random_data(writebuf, subpgsize); |
| err = mtd->write(mtd, addr, subpgsize, &written, writebuf); |
| if (unlikely(err || written != subpgsize)) { |
| printk(PRINT_PREF "error: write failed at %#llx\n", |
| (long long)addr); |
| if (written != subpgsize) { |
| printk(PRINT_PREF " write size: %#x\n", subpgsize); |
| printk(PRINT_PREF " written: %#zx\n", written); |
| } |
| return err ? err : -1; |
| } |
| |
| return err; |
| } |
| |
| static int write_eraseblock2(int ebnum) |
| { |
| size_t written = 0; |
| int err = 0, k; |
| loff_t addr = ebnum * mtd->erasesize; |
| |
| for (k = 1; k < 33; ++k) { |
| if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize) |
| break; |
| set_random_data(writebuf, subpgsize * k); |
| err = mtd->write(mtd, addr, subpgsize * k, &written, writebuf); |
| if (unlikely(err || written != subpgsize * k)) { |
| printk(PRINT_PREF "error: write failed at %#llx\n", |
| (long long)addr); |
| if (written != subpgsize) { |
| printk(PRINT_PREF " write size: %#x\n", |
| subpgsize * k); |
| printk(PRINT_PREF " written: %#08zx\n", |
| written); |
| } |
| return err ? err : -1; |
| } |
| addr += subpgsize * k; |
| } |
| |
| return err; |
| } |
| |
| static void print_subpage(unsigned char *p) |
| { |
| int i, j; |
| |
| for (i = 0; i < subpgsize; ) { |
| for (j = 0; i < subpgsize && j < 32; ++i, ++j) |
| printk("%02x", *p++); |
| printk("\n"); |
| } |
| } |
| |
| static int verify_eraseblock(int ebnum) |
| { |
| size_t read = 0; |
| int err = 0; |
| loff_t addr = ebnum * mtd->erasesize; |
| |
| set_random_data(writebuf, subpgsize); |
| clear_data(readbuf, subpgsize); |
| read = 0; |
| err = mtd->read(mtd, addr, subpgsize, &read, readbuf); |
| if (unlikely(err || read != subpgsize)) { |
| if (mtd_is_bitflip(err) && read == subpgsize) { |
| printk(PRINT_PREF "ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| printk(PRINT_PREF "error: read failed at %#llx\n", |
| (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { |
| printk(PRINT_PREF "error: verify failed at %#llx\n", |
| (long long)addr); |
| printk(PRINT_PREF "------------- written----------------\n"); |
| print_subpage(writebuf); |
| printk(PRINT_PREF "------------- read ------------------\n"); |
| print_subpage(readbuf); |
| printk(PRINT_PREF "-------------------------------------\n"); |
| errcnt += 1; |
| } |
| |
| addr += subpgsize; |
| |
| set_random_data(writebuf, subpgsize); |
| clear_data(readbuf, subpgsize); |
| read = 0; |
| err = mtd->read(mtd, addr, subpgsize, &read, readbuf); |
| if (unlikely(err || read != subpgsize)) { |
| if (mtd_is_bitflip(err) && read == subpgsize) { |
| printk(PRINT_PREF "ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| printk(PRINT_PREF "error: read failed at %#llx\n", |
| (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { |
| printk(PRINT_PREF "error: verify failed at %#llx\n", |
| (long long)addr); |
| printk(PRINT_PREF "------------- written----------------\n"); |
| print_subpage(writebuf); |
| printk(PRINT_PREF "------------- read ------------------\n"); |
| print_subpage(readbuf); |
| printk(PRINT_PREF "-------------------------------------\n"); |
| errcnt += 1; |
| } |
| |
| return err; |
| } |
| |
| static int verify_eraseblock2(int ebnum) |
| { |
| size_t read = 0; |
| int err = 0, k; |
| loff_t addr = ebnum * mtd->erasesize; |
| |
| for (k = 1; k < 33; ++k) { |
| if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize) |
| break; |
| set_random_data(writebuf, subpgsize * k); |
| clear_data(readbuf, subpgsize * k); |
| read = 0; |
| err = mtd->read(mtd, addr, subpgsize * k, &read, readbuf); |
| if (unlikely(err || read != subpgsize * k)) { |
| if (mtd_is_bitflip(err) && read == subpgsize * k) { |
| printk(PRINT_PREF "ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| printk(PRINT_PREF "error: read failed at " |
| "%#llx\n", (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) { |
| printk(PRINT_PREF "error: verify failed at %#llx\n", |
| (long long)addr); |
| errcnt += 1; |
| } |
| addr += subpgsize * k; |
| } |
| |
| return err; |
| } |
| |
| static int verify_eraseblock_ff(int ebnum) |
| { |
| uint32_t j; |
| size_t read = 0; |
| int err = 0; |
| loff_t addr = ebnum * mtd->erasesize; |
| |
| memset(writebuf, 0xff, subpgsize); |
| for (j = 0; j < mtd->erasesize / subpgsize; ++j) { |
| clear_data(readbuf, subpgsize); |
| read = 0; |
| err = mtd->read(mtd, addr, subpgsize, &read, readbuf); |
| if (unlikely(err || read != subpgsize)) { |
| if (mtd_is_bitflip(err) && read == subpgsize) { |
| printk(PRINT_PREF "ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| printk(PRINT_PREF "error: read failed at " |
| "%#llx\n", (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { |
| printk(PRINT_PREF "error: verify 0xff failed at " |
| "%#llx\n", (long long)addr); |
| errcnt += 1; |
| } |
| addr += subpgsize; |
| } |
| |
| return err; |
| } |
| |
| static int verify_all_eraseblocks_ff(void) |
| { |
| int err; |
| unsigned int i; |
| |
| printk(PRINT_PREF "verifying all eraseblocks for 0xff\n"); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = verify_eraseblock_ff(i); |
| if (err) |
| return err; |
| if (i % 256 == 0) |
| printk(PRINT_PREF "verified up to eraseblock %u\n", i); |
| cond_resched(); |
| } |
| printk(PRINT_PREF "verified %u eraseblocks\n", i); |
| 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 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; |
| } |
| |
| 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_subpagetest_init(void) |
| { |
| int err = 0; |
| uint32_t i; |
| uint64_t tmp; |
| |
| printk(KERN_INFO "\n"); |
| printk(KERN_INFO "=================================================\n"); |
| |
| if (dev < 0) { |
| printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n"); |
| printk(KERN_CRIT "CAREFUL: This test wipes all data on the specified MTD device!\n"); |
| return -EINVAL; |
| } |
| |
| 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->type != MTD_NANDFLASH) { |
| printk(PRINT_PREF "this test requires NAND flash\n"); |
| goto out; |
| } |
| |
| subpgsize = mtd->writesize >> mtd->subpage_sft; |
| 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, subpage size %u, count of eraseblocks %u, " |
| "pages per eraseblock %u, OOB size %u\n", |
| (unsigned long long)mtd->size, mtd->erasesize, |
| mtd->writesize, subpgsize, ebcnt, pgcnt, mtd->oobsize); |
| |
| err = -ENOMEM; |
| bufsize = subpgsize * 32; |
| writebuf = kmalloc(bufsize, GFP_KERNEL); |
| if (!writebuf) { |
| printk(PRINT_PREF "error: cannot allocate memory\n"); |
| goto out; |
| } |
| readbuf = kmalloc(bufsize, GFP_KERNEL); |
| if (!readbuf) { |
| printk(PRINT_PREF "error: cannot allocate memory\n"); |
| goto out; |
| } |
| |
| err = scan_for_bad_eraseblocks(); |
| if (err) |
| goto out; |
| |
| err = erase_whole_device(); |
| if (err) |
| goto out; |
| |
| printk(PRINT_PREF "writing whole device\n"); |
| simple_srand(1); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = write_eraseblock(i); |
| if (unlikely(err)) |
| goto out; |
| if (i % 256 == 0) |
| printk(PRINT_PREF "written up to eraseblock %u\n", i); |
| cond_resched(); |
| } |
| printk(PRINT_PREF "written %u eraseblocks\n", i); |
| |
| simple_srand(1); |
| printk(PRINT_PREF "verifying all eraseblocks\n"); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = verify_eraseblock(i); |
| if (unlikely(err)) |
| goto out; |
| if (i % 256 == 0) |
| printk(PRINT_PREF "verified up to eraseblock %u\n", i); |
| cond_resched(); |
| } |
| printk(PRINT_PREF "verified %u eraseblocks\n", i); |
| |
| err = erase_whole_device(); |
| if (err) |
| goto out; |
| |
| err = verify_all_eraseblocks_ff(); |
| if (err) |
| goto out; |
| |
| /* Write all eraseblocks */ |
| simple_srand(3); |
| printk(PRINT_PREF "writing whole device\n"); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = write_eraseblock2(i); |
| if (unlikely(err)) |
| goto out; |
| if (i % 256 == 0) |
| printk(PRINT_PREF "written up to eraseblock %u\n", i); |
| cond_resched(); |
| } |
| printk(PRINT_PREF "written %u eraseblocks\n", i); |
| |
| /* Check all eraseblocks */ |
| simple_srand(3); |
| printk(PRINT_PREF "verifying all eraseblocks\n"); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = verify_eraseblock2(i); |
| if (unlikely(err)) |
| goto out; |
| if (i % 256 == 0) |
| printk(PRINT_PREF "verified up to eraseblock %u\n", i); |
| cond_resched(); |
| } |
| printk(PRINT_PREF "verified %u eraseblocks\n", i); |
| |
| err = erase_whole_device(); |
| if (err) |
| goto out; |
| |
| err = verify_all_eraseblocks_ff(); |
| if (err) |
| goto out; |
| |
| printk(PRINT_PREF "finished with %d errors\n", errcnt); |
| |
| out: |
| kfree(bbt); |
| kfree(readbuf); |
| kfree(writebuf); |
| put_mtd_device(mtd); |
| if (err) |
| printk(PRINT_PREF "error %d occurred\n", err); |
| printk(KERN_INFO "=================================================\n"); |
| return err; |
| } |
| module_init(mtd_subpagetest_init); |
| |
| static void __exit mtd_subpagetest_exit(void) |
| { |
| return; |
| } |
| module_exit(mtd_subpagetest_exit); |
| |
| MODULE_DESCRIPTION("Subpage test module"); |
| MODULE_AUTHOR("Adrian Hunter"); |
| MODULE_LICENSE("GPL"); |