119 lines · c
1// SPDX-License-Identifier: GPL-2.02#define pr_fmt(fmt) "mtd_test: " fmt3 4#include <linux/module.h>5#include <linux/sched.h>6#include <linux/printk.h>7 8#include "mtd_test.h"9 10int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum)11{12 int err;13 struct erase_info ei;14 loff_t addr = (loff_t)ebnum * mtd->erasesize;15 16 memset(&ei, 0, sizeof(struct erase_info));17 ei.addr = addr;18 ei.len = mtd->erasesize;19 20 err = mtd_erase(mtd, &ei);21 if (err) {22 pr_info("error %d while erasing EB %d\n", err, ebnum);23 return err;24 }25 26 return 0;27}28EXPORT_SYMBOL_GPL(mtdtest_erase_eraseblock);29 30static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)31{32 int ret;33 loff_t addr = (loff_t)ebnum * mtd->erasesize;34 35 ret = mtd_block_isbad(mtd, addr);36 if (ret)37 pr_info("block %d is bad\n", ebnum);38 39 return ret;40}41 42int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,43 unsigned int eb, int ebcnt)44{45 int i, bad = 0;46 47 if (!mtd_can_have_bb(mtd))48 return 0;49 50 pr_info("scanning for bad eraseblocks\n");51 for (i = 0; i < ebcnt; ++i) {52 bbt[i] = is_block_bad(mtd, eb + i) ? 1 : 0;53 if (bbt[i])54 bad += 1;55 cond_resched();56 }57 pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);58 59 return 0;60}61EXPORT_SYMBOL_GPL(mtdtest_scan_for_bad_eraseblocks);62 63int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,64 unsigned int eb, int ebcnt)65{66 int err;67 unsigned int i;68 69 for (i = 0; i < ebcnt; ++i) {70 if (bbt[i])71 continue;72 err = mtdtest_erase_eraseblock(mtd, eb + i);73 if (err)74 return err;75 cond_resched();76 }77 78 return 0;79}80EXPORT_SYMBOL_GPL(mtdtest_erase_good_eraseblocks);81 82int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf)83{84 size_t read;85 int err;86 87 err = mtd_read(mtd, addr, size, &read, buf);88 /* Ignore corrected ECC errors */89 if (mtd_is_bitflip(err))90 err = 0;91 if (!err && read != size)92 err = -EIO;93 if (err)94 pr_err("error: read failed at %#llx\n", addr);95 96 return err;97}98EXPORT_SYMBOL_GPL(mtdtest_read);99 100int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,101 const void *buf)102{103 size_t written;104 int err;105 106 err = mtd_write(mtd, addr, size, &written, buf);107 if (!err && written != size)108 err = -EIO;109 if (err)110 pr_err("error: write failed at %#llx\n", addr);111 112 return err;113}114EXPORT_SYMBOL_GPL(mtdtest_write);115 116MODULE_LICENSE("GPL");117MODULE_DESCRIPTION("MTD function test helpers");118MODULE_AUTHOR("Akinobu Mita");119