staticint eb = 8;
module_param(eb, int, S_IRUGO);
MODULE_PARM_DESC(eb, "eraseblock number within the selected MTD device");
staticint ebcnt = 32;
module_param(ebcnt, int, S_IRUGO);
MODULE_PARM_DESC(ebcnt, "number of consecutive eraseblocks to torture");
staticint pgcnt;
module_param(pgcnt, int, S_IRUGO);
MODULE_PARM_DESC(pgcnt, "number of pages per eraseblock to torture (0 => all)");
staticint dev = -EINVAL;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
staticint gran = 512;
module_param(gran, int, S_IRUGO);
MODULE_PARM_DESC(gran, "how often the status information should be printed");
staticint check = 1;
module_param(check, int, S_IRUGO);
MODULE_PARM_DESC(check, "if the written data should be checked");
staticunsignedint cycles_count;
module_param(cycles_count, uint, S_IRUGO);
MODULE_PARM_DESC(cycles_count, "how many erase cycles to do " "(infinite by default)");
staticstruct mtd_info *mtd;
/* This buffer contains 0x555555...0xAAAAAA... pattern */ staticunsignedchar *patt_5A5; /* This buffer contains 0xAAAAAA...0x555555... pattern */ staticunsignedchar *patt_A5A; /* This buffer contains all 0xFF bytes */ staticunsignedchar *patt_FF; /* This a temporary buffer is use when checking data */ staticunsignedchar *check_buf; /* How many erase cycles were done */ staticunsignedint erase_cycles;
if (pgcnt) {
addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
len = pgcnt * pgsize;
}
retry:
err = mtd_read(mtd, addr, len, &read, check_buf); if (mtd_is_bitflip(err))
pr_err("single bit flip occurred at EB %d " "MTD reported that it was fixed.\n", ebnum); elseif (err) {
pr_err("error %d while reading EB %d, " "read %zd\n", err, ebnum, read); return err;
}
if (read != len) {
pr_err("failed to read %zd bytes from EB %d, " "read only %zd, but no error reported\n",
len, ebnum, read); return -EIO;
}
if (memcmp(buf, check_buf, len)) {
pr_err("read wrong data from EB %d\n", ebnum);
report_corrupt(check_buf, buf);
if (retries++ < RETRIES) { /* Try read again */
yield();
pr_info("re-try reading data from EB %d\n",
ebnum); goto retry;
} else {
pr_info("retried %d times, still errors, " "give-up\n", RETRIES); return -EINVAL;
}
}
if (retries != 0)
pr_info("only attempt number %d was OK (!!!)\n",
retries);
return0;
}
staticinlineint write_pattern(int ebnum, void *buf)
{ int err;
size_t written;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t len = mtd->erasesize;
if (pgcnt) {
addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
len = pgcnt * pgsize;
}
err = mtd_write(mtd, addr, len, &written, buf); if (err) {
pr_err("error %d while writing EB %d, written %zd" " bytes\n", err, ebnum, written); return err;
} if (written != len) {
pr_info("written only %zd bytes of %zd, but no error" " reported\n", written, len); return -EIO;
}
return0;
}
staticint __init tort_init(void)
{ int err = 0, i, infinite = !cycles_count; unsignedchar *bad_ebs;
printk(KERN_INFO "\n");
printk(KERN_INFO "=================================================\n");
pr_info("Warning: this program is trying to wear out your " "flash, stop it if this is not wanted.\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);
pr_info("torture %d eraseblocks (%d-%d) of mtd%d\n",
ebcnt, eb, eb + ebcnt - 1, dev); if (pgcnt)
pr_info("torturing just %d pages per eraseblock\n",
pgcnt);
pr_info("write verify %s\n", check ? "enabled" : "disabled");
mtd = get_mtd_device(NULL, dev); if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
pr_err("error: cannot get MTD device\n"); return err;
}
patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL); if (!patt_A5A) goto out_patt_5A5;
patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL); if (!patt_FF) goto out_patt_A5A;
check_buf = kmalloc(mtd->erasesize, GFP_KERNEL); if (!check_buf) goto out_patt_FF;
bad_ebs = kzalloc(ebcnt, GFP_KERNEL); if (!bad_ebs) goto out_check_buf;
/* Initialize patterns */
memset(patt_FF, 0xFF, mtd->erasesize); for (i = 0; i < mtd->erasesize / pgsize; i++) { if (!(i & 1)) {
memset(patt_5A5 + i * pgsize, 0x55, pgsize);
memset(patt_A5A + i * pgsize, 0xAA, pgsize);
} else {
memset(patt_5A5 + i * pgsize, 0xAA, pgsize);
memset(patt_A5A + i * pgsize, 0x55, pgsize);
}
}
err = mtdtest_scan_for_bad_eraseblocks(mtd, bad_ebs, eb, ebcnt); if (err) goto out;
start_timing(); while (1) { int i; void *patt;
err = mtdtest_erase_good_eraseblocks(mtd, bad_ebs, eb, ebcnt); if (err) goto out;
/* Check if the eraseblocks contain only 0xFF bytes */ if (check) { for (i = eb; i < eb + ebcnt; i++) { if (bad_ebs[i - eb]) continue;
err = check_eraseblock(i, patt_FF); if (err) {
pr_info("verify failed" " for 0xFF... pattern\n"); goto out;
}
err = mtdtest_relax(); if (err) goto out;
}
}
/* Write the pattern */ for (i = eb; i < eb + ebcnt; i++) { if (bad_ebs[i - eb]) continue; if ((eb + erase_cycles) & 1)
patt = patt_5A5; else
patt = patt_A5A;
err = write_pattern(i, patt); if (err) goto out;
err = mtdtest_relax(); if (err) goto out;
}
/* Verify what we wrote */ if (check) { for (i = eb; i < eb + ebcnt; i++) { if (bad_ebs[i - eb]) continue; if ((eb + erase_cycles) & 1)
patt = patt_5A5; else
patt = patt_A5A;
err = check_eraseblock(i, patt); if (err) {
pr_info("verify failed for %s" " pattern\n",
((eb + erase_cycles) & 1) ? "0x55AA55..." : "0xAA55AA..."); goto out;
}
err = mtdtest_relax(); if (err) goto out;
}
}
erase_cycles += 1;
if (erase_cycles % gran == 0) { long ms;
stop_timing();
ms = ktime_ms_delta(finish, start);
pr_info("%08u erase cycles done, took %lu " "milliseconds (%lu seconds)\n",
erase_cycles, ms, ms / 1000);
start_timing();
}
if (!infinite && --cycles_count == 0) break;
}
out:
/* *ReportthedetailedinformationabouthowthereadEBdiffersfromwhatwas *written.
*/ staticvoid report_corrupt(unsignedchar *read, unsignedchar *written)
{ int i; int bytes, bits, pages, first; int offset, len;
size_t check_len = mtd->erasesize;
if (pgcnt)
check_len = pgcnt * pgsize;
bytes = bits = pages = 0; for (i = 0; i < check_len; i += pgsize) if (countdiffs(written, read, i, pgsize, &bytes,
&bits) >= 0)
pages++;
pr_info("verify fails on %d pages, %d bytes/%d bits\n",
pages, bytes, bits);
pr_info("The following is a list of all differences between" " what was read from flash and what was expected\n");
for (i = 0; i < check_len; i += pgsize) {
cond_resched();
bytes = bits = 0;
first = countdiffs(written, read, i, pgsize, &bytes,
&bits); if (first < 0) continue;
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