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22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/err.h>
28#include <linux/mtd/mtd.h>
29#include <linux/slab.h>
30#include <linux/sched.h>
31
32#include "mtd_test.h"
33
34static int dev = -EINVAL;
35module_param(dev, int, S_IRUGO);
36MODULE_PARM_DESC(dev, "MTD device number to use");
37
38static struct mtd_info *mtd;
39static unsigned char *iobuf;
40static unsigned char *iobuf1;
41static unsigned char *bbt;
42
43static int pgsize;
44static int ebcnt;
45static int pgcnt;
46
47static int read_eraseblock_by_page(int ebnum)
48{
49 int i, ret, err = 0;
50 loff_t addr = (loff_t)ebnum * mtd->erasesize;
51 void *buf = iobuf;
52 void *oobbuf = iobuf1;
53
54 for (i = 0; i < pgcnt; i++) {
55 memset(buf, 0 , pgsize);
56 ret = mtdtest_read(mtd, addr, pgsize, buf);
57 if (ret) {
58 if (!err)
59 err = ret;
60 }
61 if (mtd->oobsize) {
62 struct mtd_oob_ops ops;
63
64 ops.mode = MTD_OPS_PLACE_OOB;
65 ops.len = 0;
66 ops.retlen = 0;
67 ops.ooblen = mtd->oobsize;
68 ops.oobretlen = 0;
69 ops.ooboffs = 0;
70 ops.datbuf = NULL;
71 ops.oobbuf = oobbuf;
72 ret = mtd_read_oob(mtd, addr, &ops);
73 if ((ret && !mtd_is_bitflip(ret)) ||
74 ops.oobretlen != mtd->oobsize) {
75 pr_err("error: read oob failed at "
76 "%#llx\n", (long long)addr);
77 if (!err)
78 err = ret;
79 if (!err)
80 err = -EINVAL;
81 }
82 oobbuf += mtd->oobsize;
83 }
84 addr += pgsize;
85 buf += pgsize;
86 }
87
88 return err;
89}
90
91static void dump_eraseblock(int ebnum)
92{
93 int i, j, n;
94 char line[128];
95 int pg, oob;
96
97 pr_info("dumping eraseblock %d\n", ebnum);
98 n = mtd->erasesize;
99 for (i = 0; i < n;) {
100 char *p = line;
101
102 p += sprintf(p, "%05x: ", i);
103 for (j = 0; j < 32 && i < n; j++, i++)
104 p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
105 printk(KERN_CRIT "%s\n", line);
106 cond_resched();
107 }
108 if (!mtd->oobsize)
109 return;
110 pr_info("dumping oob from eraseblock %d\n", ebnum);
111 n = mtd->oobsize;
112 for (pg = 0, i = 0; pg < pgcnt; pg++)
113 for (oob = 0; oob < n;) {
114 char *p = line;
115
116 p += sprintf(p, "%05x: ", i);
117 for (j = 0; j < 32 && oob < n; j++, oob++, i++)
118 p += sprintf(p, "%02x",
119 (unsigned int)iobuf1[i]);
120 printk(KERN_CRIT "%s\n", line);
121 cond_resched();
122 }
123}
124
125static int __init mtd_readtest_init(void)
126{
127 uint64_t tmp;
128 int err, i;
129
130 printk(KERN_INFO "\n");
131 printk(KERN_INFO "=================================================\n");
132
133 if (dev < 0) {
134 pr_info("Please specify a valid mtd-device via module parameter\n");
135 return -EINVAL;
136 }
137
138 pr_info("MTD device: %d\n", dev);
139
140 mtd = get_mtd_device(NULL, dev);
141 if (IS_ERR(mtd)) {
142 err = PTR_ERR(mtd);
143 pr_err("error: Cannot get MTD device\n");
144 return err;
145 }
146
147 if (mtd->writesize == 1) {
148 pr_info("not NAND flash, assume page size is 512 "
149 "bytes.\n");
150 pgsize = 512;
151 } else
152 pgsize = mtd->writesize;
153
154 tmp = mtd->size;
155 do_div(tmp, mtd->erasesize);
156 ebcnt = tmp;
157 pgcnt = mtd->erasesize / pgsize;
158
159 pr_info("MTD device size %llu, eraseblock size %u, "
160 "page size %u, count of eraseblocks %u, pages per "
161 "eraseblock %u, OOB size %u\n",
162 (unsigned long long)mtd->size, mtd->erasesize,
163 pgsize, ebcnt, pgcnt, mtd->oobsize);
164
165 err = -ENOMEM;
166 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
167 if (!iobuf)
168 goto out;
169 iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
170 if (!iobuf1)
171 goto out;
172
173 bbt = kzalloc(ebcnt, GFP_KERNEL);
174 if (!bbt)
175 goto out;
176 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
177 if (err)
178 goto out;
179
180
181 pr_info("testing page read\n");
182 for (i = 0; i < ebcnt; ++i) {
183 int ret;
184
185 if (bbt[i])
186 continue;
187 ret = read_eraseblock_by_page(i);
188 if (ret) {
189 dump_eraseblock(i);
190 if (!err)
191 err = ret;
192 }
193
194 ret = mtdtest_relax();
195 if (ret) {
196 err = ret;
197 goto out;
198 }
199 }
200
201 if (err)
202 pr_info("finished with errors\n");
203 else
204 pr_info("finished\n");
205
206out:
207
208 kfree(iobuf);
209 kfree(iobuf1);
210 kfree(bbt);
211 put_mtd_device(mtd);
212 if (err)
213 pr_info("error %d occurred\n", err);
214 printk(KERN_INFO "=================================================\n");
215 return err;
216}
217module_init(mtd_readtest_init);
218
219static void __exit mtd_readtest_exit(void)
220{
221 return;
222}
223module_exit(mtd_readtest_exit);
224
225MODULE_DESCRIPTION("Read test module");
226MODULE_AUTHOR("Adrian Hunter");
227MODULE_LICENSE("GPL");
228
