xref: /openbmc/linux/drivers/mtd/tests/readtest.c (revision 745df179)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2006-2008 Nokia Corporation
4  *
5  * Check MTD device read.
6  *
7  * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
8  */
9 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
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>
17 #include <linux/slab.h>
18 #include <linux/sched.h>
19 
20 #include "mtd_test.h"
21 
22 static int dev = -EINVAL;
23 module_param(dev, int, S_IRUGO);
24 MODULE_PARM_DESC(dev, "MTD device number to use");
25 
26 static struct mtd_info *mtd;
27 static unsigned char *iobuf;
28 static unsigned char *iobuf1;
29 static unsigned char *bbt;
30 
31 static int pgsize;
32 static int ebcnt;
33 static int pgcnt;
34 
read_eraseblock_by_page(int ebnum)35 static int read_eraseblock_by_page(int ebnum)
36 {
37 	int i, ret, err = 0;
38 	loff_t addr = (loff_t)ebnum * mtd->erasesize;
39 	void *buf = iobuf;
40 	void *oobbuf = iobuf1;
41 
42 	for (i = 0; i < pgcnt; i++) {
43 		memset(buf, 0 , pgsize);
44 		ret = mtdtest_read(mtd, addr, pgsize, buf);
45 		if (ret) {
46 			if (!err)
47 				err = ret;
48 		}
49 		if (mtd->oobsize) {
50 			struct mtd_oob_ops ops = { };
51 
52 			ops.mode      = MTD_OPS_PLACE_OOB;
53 			ops.len       = 0;
54 			ops.retlen    = 0;
55 			ops.ooblen    = mtd->oobsize;
56 			ops.oobretlen = 0;
57 			ops.ooboffs   = 0;
58 			ops.datbuf    = NULL;
59 			ops.oobbuf    = oobbuf;
60 			ret = mtd_read_oob(mtd, addr, &ops);
61 			if ((ret && !mtd_is_bitflip(ret)) ||
62 					ops.oobretlen != mtd->oobsize) {
63 				pr_err("error: read oob failed at "
64 						  "%#llx\n", (long long)addr);
65 				if (!err)
66 					err = ret;
67 				if (!err)
68 					err = -EINVAL;
69 			}
70 			oobbuf += mtd->oobsize;
71 		}
72 		addr += pgsize;
73 		buf += pgsize;
74 	}
75 
76 	return err;
77 }
78 
dump_eraseblock(int ebnum)79 static void dump_eraseblock(int ebnum)
80 {
81 	int i, j, n;
82 	char line[128];
83 	int pg, oob;
84 
85 	pr_info("dumping eraseblock %d\n", ebnum);
86 	n = mtd->erasesize;
87 	for (i = 0; i < n;) {
88 		char *p = line;
89 
90 		p += sprintf(p, "%05x: ", i);
91 		for (j = 0; j < 32 && i < n; j++, i++)
92 			p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
93 		printk(KERN_CRIT "%s\n", line);
94 		cond_resched();
95 	}
96 	if (!mtd->oobsize)
97 		return;
98 	pr_info("dumping oob from eraseblock %d\n", ebnum);
99 	n = mtd->oobsize;
100 	for (pg = 0, i = 0; pg < pgcnt; pg++)
101 		for (oob = 0; oob < n;) {
102 			char *p = line;
103 
104 			p += sprintf(p, "%05x: ", i);
105 			for (j = 0; j < 32 && oob < n; j++, oob++, i++)
106 				p += sprintf(p, "%02x",
107 					     (unsigned int)iobuf1[i]);
108 			printk(KERN_CRIT "%s\n", line);
109 			cond_resched();
110 		}
111 }
112 
mtd_readtest_init(void)113 static int __init mtd_readtest_init(void)
114 {
115 	uint64_t tmp;
116 	int err, i;
117 
118 	printk(KERN_INFO "\n");
119 	printk(KERN_INFO "=================================================\n");
120 
121 	if (dev < 0) {
122 		pr_info("Please specify a valid mtd-device via module parameter\n");
123 		return -EINVAL;
124 	}
125 
126 	pr_info("MTD device: %d\n", dev);
127 
128 	mtd = get_mtd_device(NULL, dev);
129 	if (IS_ERR(mtd)) {
130 		err = PTR_ERR(mtd);
131 		pr_err("error: Cannot get MTD device\n");
132 		return err;
133 	}
134 
135 	if (mtd->writesize == 1) {
136 		pr_info("not NAND flash, assume page size is 512 "
137 		       "bytes.\n");
138 		pgsize = 512;
139 	} else
140 		pgsize = mtd->writesize;
141 
142 	tmp = mtd->size;
143 	do_div(tmp, mtd->erasesize);
144 	ebcnt = tmp;
145 	pgcnt = mtd->erasesize / pgsize;
146 
147 	pr_info("MTD device size %llu, eraseblock size %u, "
148 	       "page size %u, count of eraseblocks %u, pages per "
149 	       "eraseblock %u, OOB size %u\n",
150 	       (unsigned long long)mtd->size, mtd->erasesize,
151 	       pgsize, ebcnt, pgcnt, mtd->oobsize);
152 
153 	err = -ENOMEM;
154 	iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
155 	if (!iobuf)
156 		goto out;
157 	iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
158 	if (!iobuf1)
159 		goto out;
160 
161 	bbt = kzalloc(ebcnt, GFP_KERNEL);
162 	if (!bbt)
163 		goto out;
164 	err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
165 	if (err)
166 		goto out;
167 
168 	/* Read all eraseblocks 1 page at a time */
169 	pr_info("testing page read\n");
170 	for (i = 0; i < ebcnt; ++i) {
171 		int ret;
172 
173 		if (bbt[i])
174 			continue;
175 		ret = read_eraseblock_by_page(i);
176 		if (ret) {
177 			dump_eraseblock(i);
178 			if (!err)
179 				err = ret;
180 		}
181 
182 		ret = mtdtest_relax();
183 		if (ret) {
184 			err = ret;
185 			goto out;
186 		}
187 	}
188 
189 	if (err)
190 		pr_info("finished with errors\n");
191 	else
192 		pr_info("finished\n");
193 
194 out:
195 
196 	kfree(iobuf);
197 	kfree(iobuf1);
198 	kfree(bbt);
199 	put_mtd_device(mtd);
200 	if (err)
201 		pr_info("error %d occurred\n", err);
202 	printk(KERN_INFO "=================================================\n");
203 	return err;
204 }
205 module_init(mtd_readtest_init);
206 
mtd_readtest_exit(void)207 static void __exit mtd_readtest_exit(void)
208 {
209 	return;
210 }
211 module_exit(mtd_readtest_exit);
212 
213 MODULE_DESCRIPTION("Read test module");
214 MODULE_AUTHOR("Adrian Hunter");
215 MODULE_LICENSE("GPL");
216