Thomas Gleixner | 4cd1035 | 2019-05-29 16:57:41 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2006-2008 Nokia Corporation |
| 4 | * |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 5 | * Test random reads, writes and erases on MTD device. |
| 6 | * |
| 7 | * Author: Adrian Hunter <ext-adrian.hunter@nokia.com> |
| 8 | */ |
| 9 | |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 11 | |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/mtd/mtd.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 18 | #include <linux/sched.h> |
| 19 | #include <linux/vmalloc.h> |
Artem Bityutskiy | bfea1d4 | 2012-05-18 18:44:53 +0300 | [diff] [blame] | 20 | #include <linux/random.h> |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 21 | |
Akinobu Mita | 5a78df6 | 2013-08-03 18:52:13 +0900 | [diff] [blame] | 22 | #include "mtd_test.h" |
| 23 | |
Wolfram Sang | 7406060 | 2011-10-30 00:11:53 +0200 | [diff] [blame] | 24 | static int dev = -EINVAL; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 25 | module_param(dev, int, S_IRUGO); |
| 26 | MODULE_PARM_DESC(dev, "MTD device number to use"); |
| 27 | |
| 28 | static int count = 10000; |
| 29 | module_param(count, int, S_IRUGO); |
| 30 | MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)"); |
| 31 | |
| 32 | static struct mtd_info *mtd; |
| 33 | static unsigned char *writebuf; |
| 34 | static unsigned char *readbuf; |
| 35 | static unsigned char *bbt; |
| 36 | static int *offsets; |
| 37 | |
| 38 | static int pgsize; |
| 39 | static int bufsize; |
| 40 | static int ebcnt; |
| 41 | static int pgcnt; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 42 | |
| 43 | static int rand_eb(void) |
| 44 | { |
Artem Bityutskiy | bfea1d4 | 2012-05-18 18:44:53 +0300 | [diff] [blame] | 45 | unsigned int eb; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 46 | |
| 47 | again: |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 48 | /* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */ |
Jason A. Donenfeld | 8032bf1 | 2022-10-09 20:44:02 -0600 | [diff] [blame] | 49 | eb = get_random_u32_below(ebcnt - 1); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 50 | if (bbt[eb]) |
| 51 | goto again; |
| 52 | return eb; |
| 53 | } |
| 54 | |
| 55 | static int rand_offs(void) |
| 56 | { |
Jason A. Donenfeld | 8032bf1 | 2022-10-09 20:44:02 -0600 | [diff] [blame] | 57 | return get_random_u32_below(bufsize); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | static int rand_len(int offs) |
| 61 | { |
Jason A. Donenfeld | 8032bf1 | 2022-10-09 20:44:02 -0600 | [diff] [blame] | 62 | return get_random_u32_below(bufsize - offs); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 63 | } |
| 64 | |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 65 | static int do_read(void) |
| 66 | { |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 67 | int eb = rand_eb(); |
| 68 | int offs = rand_offs(); |
Akinobu Mita | abc173a | 2013-08-15 22:55:08 +0900 | [diff] [blame] | 69 | int len = rand_len(offs); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 70 | loff_t addr; |
| 71 | |
| 72 | if (bbt[eb + 1]) { |
| 73 | if (offs >= mtd->erasesize) |
| 74 | offs -= mtd->erasesize; |
| 75 | if (offs + len > mtd->erasesize) |
| 76 | len = mtd->erasesize - offs; |
| 77 | } |
Brian Norris | b9da8ba | 2015-02-28 02:02:26 -0800 | [diff] [blame] | 78 | addr = (loff_t)eb * mtd->erasesize + offs; |
Akinobu Mita | abc173a | 2013-08-15 22:55:08 +0900 | [diff] [blame] | 79 | return mtdtest_read(mtd, addr, len, readbuf); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static int do_write(void) |
| 83 | { |
| 84 | int eb = rand_eb(), offs, err, len; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 85 | loff_t addr; |
| 86 | |
| 87 | offs = offsets[eb]; |
| 88 | if (offs >= mtd->erasesize) { |
Akinobu Mita | 5a78df6 | 2013-08-03 18:52:13 +0900 | [diff] [blame] | 89 | err = mtdtest_erase_eraseblock(mtd, eb); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 90 | if (err) |
| 91 | return err; |
| 92 | offs = offsets[eb] = 0; |
| 93 | } |
| 94 | len = rand_len(offs); |
| 95 | len = ((len + pgsize - 1) / pgsize) * pgsize; |
| 96 | if (offs + len > mtd->erasesize) { |
| 97 | if (bbt[eb + 1]) |
| 98 | len = mtd->erasesize - offs; |
| 99 | else { |
Akinobu Mita | 5a78df6 | 2013-08-03 18:52:13 +0900 | [diff] [blame] | 100 | err = mtdtest_erase_eraseblock(mtd, eb + 1); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 101 | if (err) |
| 102 | return err; |
| 103 | offsets[eb + 1] = 0; |
| 104 | } |
| 105 | } |
Brian Norris | b9da8ba | 2015-02-28 02:02:26 -0800 | [diff] [blame] | 106 | addr = (loff_t)eb * mtd->erasesize + offs; |
Akinobu Mita | 5a78df6 | 2013-08-03 18:52:13 +0900 | [diff] [blame] | 107 | err = mtdtest_write(mtd, addr, len, writebuf); |
Akinobu Mita | 8a9f4aa | 2013-08-15 22:55:09 +0900 | [diff] [blame] | 108 | if (unlikely(err)) |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 109 | return err; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 110 | offs += len; |
| 111 | while (offs > mtd->erasesize) { |
| 112 | offsets[eb++] = mtd->erasesize; |
| 113 | offs -= mtd->erasesize; |
| 114 | } |
| 115 | offsets[eb] = offs; |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | static int do_operation(void) |
| 120 | { |
Jason A. Donenfeld | 8032bf1 | 2022-10-09 20:44:02 -0600 | [diff] [blame] | 121 | if (get_random_u32_below(2)) |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 122 | return do_read(); |
| 123 | else |
| 124 | return do_write(); |
| 125 | } |
| 126 | |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 127 | static int __init mtd_stresstest_init(void) |
| 128 | { |
| 129 | int err; |
| 130 | int i, op; |
| 131 | uint64_t tmp; |
| 132 | |
| 133 | printk(KERN_INFO "\n"); |
| 134 | printk(KERN_INFO "=================================================\n"); |
Wolfram Sang | 7406060 | 2011-10-30 00:11:53 +0200 | [diff] [blame] | 135 | |
| 136 | if (dev < 0) { |
Masanari Iida | 064a7694 | 2012-11-09 23:20:58 +0900 | [diff] [blame] | 137 | pr_info("Please specify a valid mtd-device via module parameter\n"); |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 138 | pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n"); |
Wolfram Sang | 7406060 | 2011-10-30 00:11:53 +0200 | [diff] [blame] | 139 | return -EINVAL; |
| 140 | } |
| 141 | |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 142 | pr_info("MTD device: %d\n", dev); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 143 | |
| 144 | mtd = get_mtd_device(NULL, dev); |
| 145 | if (IS_ERR(mtd)) { |
| 146 | err = PTR_ERR(mtd); |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 147 | pr_err("error: cannot get MTD device\n"); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 148 | return err; |
| 149 | } |
| 150 | |
| 151 | if (mtd->writesize == 1) { |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 152 | pr_info("not NAND flash, assume page size is 512 " |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 153 | "bytes.\n"); |
| 154 | pgsize = 512; |
| 155 | } else |
| 156 | pgsize = mtd->writesize; |
| 157 | |
| 158 | tmp = mtd->size; |
| 159 | do_div(tmp, mtd->erasesize); |
| 160 | ebcnt = tmp; |
Morten Thunberg Svendsen | f5e2bae | 2010-01-06 10:48:18 +0100 | [diff] [blame] | 161 | pgcnt = mtd->erasesize / pgsize; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 162 | |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 163 | pr_info("MTD device size %llu, eraseblock size %u, " |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 164 | "page size %u, count of eraseblocks %u, pages per " |
| 165 | "eraseblock %u, OOB size %u\n", |
| 166 | (unsigned long long)mtd->size, mtd->erasesize, |
| 167 | pgsize, ebcnt, pgcnt, mtd->oobsize); |
| 168 | |
Wolfram Sang | 2f4478c | 2011-11-29 15:34:08 +0100 | [diff] [blame] | 169 | if (ebcnt < 2) { |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 170 | pr_err("error: need at least 2 eraseblocks\n"); |
Wolfram Sang | 2f4478c | 2011-11-29 15:34:08 +0100 | [diff] [blame] | 171 | err = -ENOSPC; |
| 172 | goto out_put_mtd; |
| 173 | } |
| 174 | |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 175 | /* Read or write up 2 eraseblocks at a time */ |
| 176 | bufsize = mtd->erasesize * 2; |
| 177 | |
| 178 | err = -ENOMEM; |
| 179 | readbuf = vmalloc(bufsize); |
| 180 | writebuf = vmalloc(bufsize); |
Kees Cook | 6da2ec5 | 2018-06-12 13:55:00 -0700 | [diff] [blame] | 181 | offsets = kmalloc_array(ebcnt, sizeof(int), GFP_KERNEL); |
Brian Norris | 33777e6 | 2013-05-02 14:18:51 -0700 | [diff] [blame] | 182 | if (!readbuf || !writebuf || !offsets) |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 183 | goto out; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 184 | for (i = 0; i < ebcnt; i++) |
| 185 | offsets[i] = mtd->erasesize; |
Jason A. Donenfeld | 197173d | 2022-10-05 17:49:46 +0200 | [diff] [blame] | 186 | get_random_bytes(writebuf, bufsize); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 187 | |
Akinobu Mita | 5a78df6 | 2013-08-03 18:52:13 +0900 | [diff] [blame] | 188 | bbt = kzalloc(ebcnt, GFP_KERNEL); |
| 189 | if (!bbt) |
| 190 | goto out; |
| 191 | err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 192 | if (err) |
| 193 | goto out; |
| 194 | |
| 195 | /* Do operations */ |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 196 | pr_info("doing operations\n"); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 197 | for (op = 0; op < count; op++) { |
| 198 | if ((op & 1023) == 0) |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 199 | pr_info("%d operations done\n", op); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 200 | err = do_operation(); |
| 201 | if (err) |
| 202 | goto out; |
Richard Weinberger | 2a6a28e7 | 2015-03-29 21:52:06 +0200 | [diff] [blame] | 203 | |
| 204 | err = mtdtest_relax(); |
| 205 | if (err) |
| 206 | goto out; |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 207 | } |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 208 | pr_info("finished, %d operations done\n", op); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 209 | |
| 210 | out: |
| 211 | kfree(offsets); |
| 212 | kfree(bbt); |
| 213 | vfree(writebuf); |
| 214 | vfree(readbuf); |
Wolfram Sang | 2f4478c | 2011-11-29 15:34:08 +0100 | [diff] [blame] | 215 | out_put_mtd: |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 216 | put_mtd_device(mtd); |
| 217 | if (err) |
Vikram Narayanan | ae0086c | 2012-10-10 23:10:22 +0530 | [diff] [blame] | 218 | pr_info("error %d occurred\n", err); |
Artem Bityutskiy | 7163cea | 2008-12-08 13:36:47 +0200 | [diff] [blame] | 219 | printk(KERN_INFO "=================================================\n"); |
| 220 | return err; |
| 221 | } |
| 222 | module_init(mtd_stresstest_init); |
| 223 | |
| 224 | static void __exit mtd_stresstest_exit(void) |
| 225 | { |
| 226 | return; |
| 227 | } |
| 228 | module_exit(mtd_stresstest_exit); |
| 229 | |
| 230 | MODULE_DESCRIPTION("Stress test module"); |
| 231 | MODULE_AUTHOR("Adrian Hunter"); |
| 232 | MODULE_LICENSE("GPL"); |