* 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/vmalloc.h>
+#include <linux/random.h>
-#define PRINT_PREF KERN_INFO "mtd_stresstest: "
-
-static int dev;
+static int dev = -EINVAL;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
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;
+ unsigned int eb;
again:
- if (ebcnt < 32768)
- eb = simple_rand();
- else
- eb = (simple_rand() << 15) | simple_rand();
+ eb = prandom_u32();
/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
eb %= (ebcnt - 1);
if (bbt[eb])
static int rand_offs(void)
{
- int offs;
+ unsigned int offs;
- if (bufsize < 32768)
- offs = simple_rand();
- else
- offs = (simple_rand() << 15) | simple_rand();
+ offs = prandom_u32();
offs %= bufsize;
return offs;
}
static int rand_len(int offs)
{
- int len;
+ unsigned int len;
- if (bufsize < 32768)
- len = simple_rand();
- else
- len = (simple_rand() << 15) | simple_rand();
+ len = prandom_u32();
len %= (bufsize - offs);
return len;
}
ei.addr = addr;
ei.len = mtd->erasesize;
- err = mtd->erase(mtd, &ei);
+ err = mtd_erase(mtd, &ei);
if (unlikely(err)) {
- printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
+ pr_err("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",
+ pr_err("some erase error occurred at EB %d\n",
ebnum);
return -EIO;
}
loff_t addr = ebnum * mtd->erasesize;
int ret;
- ret = mtd->block_isbad(mtd, addr);
+ ret = mtd_block_isbad(mtd, addr);
if (ret)
- printk(PRINT_PREF "block %d is bad\n", ebnum);
+ pr_info("block %d is bad\n", ebnum);
return ret;
}
static int do_read(void)
{
- size_t read = 0;
+ size_t read;
int eb = rand_eb();
int offs = rand_offs();
int len = rand_len(offs), err;
len = mtd->erasesize - offs;
}
addr = eb * mtd->erasesize + offs;
- err = mtd->read(mtd, addr, len, &read, readbuf);
- if (err == -EUCLEAN)
+ 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",
+ pr_err("error: read failed at 0x%llx\n",
(long long)addr);
if (!err)
err = -EINVAL;
static int do_write(void)
{
int eb = rand_eb(), offs, err, len;
- size_t written = 0;
+ size_t written;
loff_t addr;
offs = offsets[eb];
}
}
addr = eb * mtd->erasesize + offs;
- err = mtd->write(mtd, addr, len, &written, writebuf);
+ err = mtd_write(mtd, addr, len, &written, writebuf);
if (unlikely(err || written != len)) {
- printk(PRINT_PREF "error: write failed at 0x%llx\n",
+ pr_err("error: write failed at 0x%llx\n",
(long long)addr);
if (!err)
err = -EINVAL;
static int do_operation(void)
{
- if (simple_rand() & 1)
+ if (prandom_u32() & 1)
return do_read();
else
return do_write();
{
int i, bad = 0;
- bbt = kmalloc(ebcnt, GFP_KERNEL);
+ bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt) {
- printk(PRINT_PREF "error: cannot allocate memory\n");
+ pr_err("error: cannot allocate memory\n");
return -ENOMEM;
}
- memset(bbt, 0 , ebcnt);
- /* NOR flash does not implement block_isbad */
- if (mtd->block_isbad == NULL)
+ if (!mtd_can_have_bb(mtd))
return 0;
- printk(PRINT_PREF "scanning for bad eraseblocks\n");
+ pr_info("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);
+ pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
return 0;
}
printk(KERN_INFO "\n");
printk(KERN_INFO "=================================================\n");
- printk(PRINT_PREF "MTD device: %d\n", dev);
+
+ 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);
- printk(PRINT_PREF "error: cannot get MTD device\n");
+ pr_err("error: cannot get MTD device\n");
return err;
}
if (mtd->writesize == 1) {
- printk(PRINT_PREF "not NAND flash, assume page size is 512 "
+ pr_info("not NAND flash, assume page size is 512 "
"bytes.\n");
pgsize = 512;
} else
ebcnt = tmp;
pgcnt = mtd->erasesize / pgsize;
- printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
+ pr_info("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);
+ if (ebcnt < 2) {
+ pr_err("error: need at least 2 eraseblocks\n");
+ err = -ENOSPC;
+ goto out_put_mtd;
+ }
+
/* Read or write up 2 eraseblocks at a time */
bufsize = mtd->erasesize * 2;
writebuf = vmalloc(bufsize);
offsets = kmalloc(ebcnt * sizeof(int), GFP_KERNEL);
if (!readbuf || !writebuf || !offsets) {
- printk(PRINT_PREF "error: cannot allocate memory\n");
+ pr_err("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();
+ prandom_bytes(writebuf, bufsize);
err = scan_for_bad_eraseblocks();
if (err)
goto out;
/* Do operations */
- printk(PRINT_PREF "doing operations\n");
+ pr_info("doing operations\n");
for (op = 0; op < count; op++) {
if ((op & 1023) == 0)
- printk(PRINT_PREF "%d operations done\n", op);
+ pr_info("%d operations done\n", op);
err = do_operation();
if (err)
goto out;
cond_resched();
}
- printk(PRINT_PREF "finished, %d operations done\n", op);
+ pr_info("finished, %d operations done\n", op);
out:
kfree(offsets);
kfree(bbt);
vfree(writebuf);
vfree(readbuf);
+out_put_mtd:
put_mtd_device(mtd);
if (err)
- printk(PRINT_PREF "error %d occurred\n", err);
+ pr_info("error %d occurred\n", err);
printk(KERN_INFO "=================================================\n");
return err;
}