| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2006-2007 Nokia Corporation |
| * |
| * Test sub-page read and write 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/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 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 struct rnd_state rnd_state; |
| |
| static inline void clear_data(unsigned char *buf, size_t len) |
| { |
| memset(buf, 0, len); |
| } |
| |
| static int write_eraseblock(int ebnum) |
| { |
| size_t written; |
| int err = 0; |
| loff_t addr = (loff_t)ebnum * mtd->erasesize; |
| |
| prandom_bytes_state(&rnd_state, writebuf, subpgsize); |
| err = mtd_write(mtd, addr, subpgsize, &written, writebuf); |
| if (unlikely(err || written != subpgsize)) { |
| pr_err("error: write failed at %#llx\n", |
| (long long)addr); |
| if (written != subpgsize) { |
| pr_err(" write size: %#x\n", subpgsize); |
| pr_err(" written: %#zx\n", written); |
| } |
| return err ? err : -1; |
| } |
| |
| addr += subpgsize; |
| |
| prandom_bytes_state(&rnd_state, writebuf, subpgsize); |
| err = mtd_write(mtd, addr, subpgsize, &written, writebuf); |
| if (unlikely(err || written != subpgsize)) { |
| pr_err("error: write failed at %#llx\n", |
| (long long)addr); |
| if (written != subpgsize) { |
| pr_err(" write size: %#x\n", subpgsize); |
| pr_err(" written: %#zx\n", written); |
| } |
| return err ? err : -1; |
| } |
| |
| return err; |
| } |
| |
| static int write_eraseblock2(int ebnum) |
| { |
| size_t written; |
| int err = 0, k; |
| loff_t addr = (loff_t)ebnum * mtd->erasesize; |
| |
| for (k = 1; k < 33; ++k) { |
| if (addr + (subpgsize * k) > (loff_t)(ebnum + 1) * mtd->erasesize) |
| break; |
| prandom_bytes_state(&rnd_state, writebuf, subpgsize * k); |
| err = mtd_write(mtd, addr, subpgsize * k, &written, writebuf); |
| if (unlikely(err || written != subpgsize * k)) { |
| pr_err("error: write failed at %#llx\n", |
| (long long)addr); |
| if (written != subpgsize * k) { |
| pr_err(" write size: %#x\n", |
| subpgsize * k); |
| pr_err(" 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; |
| int err = 0; |
| loff_t addr = (loff_t)ebnum * mtd->erasesize; |
| |
| prandom_bytes_state(&rnd_state, writebuf, subpgsize); |
| clear_data(readbuf, subpgsize); |
| err = mtd_read(mtd, addr, subpgsize, &read, readbuf); |
| if (unlikely(err || read != subpgsize)) { |
| if (mtd_is_bitflip(err) && read == subpgsize) { |
| pr_info("ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| pr_err("error: read failed at %#llx\n", |
| (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { |
| pr_err("error: verify failed at %#llx\n", |
| (long long)addr); |
| pr_info("------------- written----------------\n"); |
| print_subpage(writebuf); |
| pr_info("------------- read ------------------\n"); |
| print_subpage(readbuf); |
| pr_info("-------------------------------------\n"); |
| errcnt += 1; |
| } |
| |
| addr += subpgsize; |
| |
| prandom_bytes_state(&rnd_state, writebuf, subpgsize); |
| clear_data(readbuf, subpgsize); |
| err = mtd_read(mtd, addr, subpgsize, &read, readbuf); |
| if (unlikely(err || read != subpgsize)) { |
| if (mtd_is_bitflip(err) && read == subpgsize) { |
| pr_info("ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| pr_err("error: read failed at %#llx\n", |
| (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { |
| pr_info("error: verify failed at %#llx\n", |
| (long long)addr); |
| pr_info("------------- written----------------\n"); |
| print_subpage(writebuf); |
| pr_info("------------- read ------------------\n"); |
| print_subpage(readbuf); |
| pr_info("-------------------------------------\n"); |
| errcnt += 1; |
| } |
| |
| return err; |
| } |
| |
| static int verify_eraseblock2(int ebnum) |
| { |
| size_t read; |
| int err = 0, k; |
| loff_t addr = (loff_t)ebnum * mtd->erasesize; |
| |
| for (k = 1; k < 33; ++k) { |
| if (addr + (subpgsize * k) > (loff_t)(ebnum + 1) * mtd->erasesize) |
| break; |
| prandom_bytes_state(&rnd_state, writebuf, subpgsize * k); |
| clear_data(readbuf, subpgsize * k); |
| err = mtd_read(mtd, addr, subpgsize * k, &read, readbuf); |
| if (unlikely(err || read != subpgsize * k)) { |
| if (mtd_is_bitflip(err) && read == subpgsize * k) { |
| pr_info("ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| pr_err("error: read failed at " |
| "%#llx\n", (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) { |
| pr_err("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; |
| int err = 0; |
| loff_t addr = (loff_t)ebnum * mtd->erasesize; |
| |
| memset(writebuf, 0xff, subpgsize); |
| for (j = 0; j < mtd->erasesize / subpgsize; ++j) { |
| clear_data(readbuf, subpgsize); |
| err = mtd_read(mtd, addr, subpgsize, &read, readbuf); |
| if (unlikely(err || read != subpgsize)) { |
| if (mtd_is_bitflip(err) && read == subpgsize) { |
| pr_info("ECC correction at %#llx\n", |
| (long long)addr); |
| err = 0; |
| } else { |
| pr_err("error: read failed at " |
| "%#llx\n", (long long)addr); |
| return err ? err : -1; |
| } |
| } |
| if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { |
| pr_err("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; |
| |
| pr_info("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) |
| pr_info("verified up to eraseblock %u\n", i); |
| |
| err = mtdtest_relax(); |
| if (err) |
| return err; |
| } |
| pr_info("verified %u eraseblocks\n", i); |
| 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) { |
| 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_type_is_nand(mtd)) { |
| pr_info("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; |
| |
| pr_info("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) |
| goto out; |
| readbuf = kmalloc(bufsize, GFP_KERNEL); |
| if (!readbuf) |
| goto out; |
| bbt = kzalloc(ebcnt, GFP_KERNEL); |
| if (!bbt) |
| goto out; |
| |
| err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); |
| if (err) |
| goto out; |
| |
| err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); |
| if (err) |
| goto out; |
| |
| pr_info("writing whole device\n"); |
| prandom_seed_state(&rnd_state, 1); |
| for (i = 0; i < ebcnt; ++i) { |
| if (bbt[i]) |
| continue; |
| err = write_eraseblock(i); |
| if (unlikely(err)) |
| goto out; |
| if (i % 256 == 0) |
| pr_info("written up to eraseblock %u\n", i); |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| pr_info("written %u eraseblocks\n", i); |
| |
| prandom_seed_state(&rnd_state, 1); |
| pr_info("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) |
| pr_info("verified up to eraseblock %u\n", i); |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| pr_info("verified %u eraseblocks\n", i); |
| |
| err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); |
| if (err) |
| goto out; |
| |
| err = verify_all_eraseblocks_ff(); |
| if (err) |
| goto out; |
| |
| /* Write all eraseblocks */ |
| prandom_seed_state(&rnd_state, 3); |
| pr_info("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) |
| pr_info("written up to eraseblock %u\n", i); |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| pr_info("written %u eraseblocks\n", i); |
| |
| /* Check all eraseblocks */ |
| prandom_seed_state(&rnd_state, 3); |
| pr_info("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) |
| pr_info("verified up to eraseblock %u\n", i); |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| pr_info("verified %u eraseblocks\n", i); |
| |
| err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); |
| if (err) |
| goto out; |
| |
| err = verify_all_eraseblocks_ff(); |
| if (err) |
| goto out; |
| |
| pr_info("finished with %d errors\n", errcnt); |
| |
| out: |
| kfree(bbt); |
| kfree(readbuf); |
| kfree(writebuf); |
| put_mtd_device(mtd); |
| if (err) |
| pr_info("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"); |
