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-rw-r--r--drivers/mtd/tests/stresstest.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/mtd/tests/stresstest.c b/drivers/mtd/tests/stresstest.c
new file mode 100644
index 000000000..75b6ddc5d
--- /dev/null
+++ b/drivers/mtd/tests/stresstest.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2006-2008 Nokia Corporation
+ *
+ * Test random reads, writes and erases 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/vmalloc.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 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 int rand_eb(void)
+{
+ unsigned int eb;
+
+again:
+ /* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
+ eb = prandom_u32_max(ebcnt - 1);
+ if (bbt[eb])
+ goto again;
+ return eb;
+}
+
+static int rand_offs(void)
+{
+ return prandom_u32_max(bufsize);
+}
+
+static int rand_len(int offs)
+{
+ return prandom_u32_max(bufsize - offs);
+}
+
+static int do_read(void)
+{
+ int eb = rand_eb();
+ int offs = rand_offs();
+ int len = rand_len(offs);
+ loff_t addr;
+
+ if (bbt[eb + 1]) {
+ if (offs >= mtd->erasesize)
+ offs -= mtd->erasesize;
+ if (offs + len > mtd->erasesize)
+ len = mtd->erasesize - offs;
+ }
+ addr = (loff_t)eb * mtd->erasesize + offs;
+ return mtdtest_read(mtd, addr, len, readbuf);
+}
+
+static int do_write(void)
+{
+ int eb = rand_eb(), offs, err, len;
+ loff_t addr;
+
+ offs = offsets[eb];
+ if (offs >= mtd->erasesize) {
+ err = mtdtest_erase_eraseblock(mtd, 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 = mtdtest_erase_eraseblock(mtd, eb + 1);
+ if (err)
+ return err;
+ offsets[eb + 1] = 0;
+ }
+ }
+ addr = (loff_t)eb * mtd->erasesize + offs;
+ err = mtdtest_write(mtd, addr, len, writebuf);
+ if (unlikely(err))
+ 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 (prandom_u32_max(2))
+ return do_read();
+ else
+ return do_write();
+}
+
+static int __init mtd_stresstest_init(void)
+{
+ int err;
+ int i, op;
+ 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->writesize == 1) {
+ pr_info("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;
+
+ 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;
+
+ err = -ENOMEM;
+ readbuf = vmalloc(bufsize);
+ writebuf = vmalloc(bufsize);
+ offsets = kmalloc_array(ebcnt, sizeof(int), GFP_KERNEL);
+ if (!readbuf || !writebuf || !offsets)
+ goto out;
+ for (i = 0; i < ebcnt; i++)
+ offsets[i] = mtd->erasesize;
+ get_random_bytes(writebuf, bufsize);
+
+ bbt = kzalloc(ebcnt, GFP_KERNEL);
+ if (!bbt)
+ goto out;
+ err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
+ if (err)
+ goto out;
+
+ /* Do operations */
+ pr_info("doing operations\n");
+ for (op = 0; op < count; op++) {
+ if ((op & 1023) == 0)
+ pr_info("%d operations done\n", op);
+ err = do_operation();
+ if (err)
+ goto out;
+
+ err = mtdtest_relax();
+ if (err)
+ goto out;
+ }
+ 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)
+ pr_info("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");