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path: root/drivers/mtd/ubi/debug.c
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Diffstat (limited to 'drivers/mtd/ubi/debug.c')
-rw-r--r--drivers/mtd/ubi/debug.c132
1 files changed, 112 insertions, 20 deletions
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index fcca6942dbdd..d2a53961d8e2 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -10,7 +10,37 @@
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/seq_file.h>
+#include <linux/fault-inject.h>
+
+#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
+static DECLARE_FAULT_ATTR(fault_eccerr_attr);
+static DECLARE_FAULT_ATTR(fault_bitflips_attr);
+static DECLARE_FAULT_ATTR(fault_read_failure_attr);
+static DECLARE_FAULT_ATTR(fault_write_failure_attr);
+static DECLARE_FAULT_ATTR(fault_erase_failure_attr);
+static DECLARE_FAULT_ATTR(fault_power_cut_attr);
+static DECLARE_FAULT_ATTR(fault_io_ff_attr);
+static DECLARE_FAULT_ATTR(fault_io_ff_bitflips_attr);
+static DECLARE_FAULT_ATTR(fault_bad_hdr_attr);
+static DECLARE_FAULT_ATTR(fault_bad_hdr_ebadmsg_attr);
+
+#define FAIL_ACTION(name, fault_attr) \
+bool should_fail_##name(void) \
+{ \
+ return should_fail(&fault_attr, 1); \
+}
+FAIL_ACTION(eccerr, fault_eccerr_attr)
+FAIL_ACTION(bitflips, fault_bitflips_attr)
+FAIL_ACTION(read_failure, fault_read_failure_attr)
+FAIL_ACTION(write_failure, fault_write_failure_attr)
+FAIL_ACTION(erase_failure, fault_erase_failure_attr)
+FAIL_ACTION(power_cut, fault_power_cut_attr)
+FAIL_ACTION(io_ff, fault_io_ff_attr)
+FAIL_ACTION(io_ff_bitflips, fault_io_ff_bitflips_attr)
+FAIL_ACTION(bad_hdr, fault_bad_hdr_attr)
+FAIL_ACTION(bad_hdr_ebadmsg, fault_bad_hdr_ebadmsg_attr)
+#endif
/**
* ubi_dump_flash - dump a region of flash.
@@ -212,6 +242,52 @@ void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
*/
static struct dentry *dfs_rootdir;
+#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
+static void dfs_create_fault_entry(struct dentry *parent)
+{
+ struct dentry *dir;
+
+ dir = debugfs_create_dir("fault_inject", parent);
+ if (IS_ERR_OR_NULL(dir)) {
+ int err = dir ? PTR_ERR(dir) : -ENODEV;
+
+ pr_warn("UBI error: cannot create \"fault_inject\" debugfs directory, error %d\n",
+ err);
+ return;
+ }
+
+ fault_create_debugfs_attr("emulate_eccerr", dir,
+ &fault_eccerr_attr);
+
+ fault_create_debugfs_attr("emulate_read_failure", dir,
+ &fault_read_failure_attr);
+
+ fault_create_debugfs_attr("emulate_bitflips", dir,
+ &fault_bitflips_attr);
+
+ fault_create_debugfs_attr("emulate_write_failure", dir,
+ &fault_write_failure_attr);
+
+ fault_create_debugfs_attr("emulate_erase_failure", dir,
+ &fault_erase_failure_attr);
+
+ fault_create_debugfs_attr("emulate_power_cut", dir,
+ &fault_power_cut_attr);
+
+ fault_create_debugfs_attr("emulate_io_ff", dir,
+ &fault_io_ff_attr);
+
+ fault_create_debugfs_attr("emulate_io_ff_bitflips", dir,
+ &fault_io_ff_bitflips_attr);
+
+ fault_create_debugfs_attr("emulate_bad_hdr", dir,
+ &fault_bad_hdr_attr);
+
+ fault_create_debugfs_attr("emulate_bad_hdr_ebadmsg", dir,
+ &fault_bad_hdr_ebadmsg_attr);
+}
+#endif
+
/**
* ubi_debugfs_init - create UBI debugfs directory.
*
@@ -232,6 +308,10 @@ int ubi_debugfs_init(void)
return err;
}
+#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
+ dfs_create_fault_entry(dfs_rootdir);
+#endif
+
return 0;
}
@@ -252,7 +332,7 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
struct dentry *dent = file->f_path.dentry;
struct ubi_device *ubi;
struct ubi_debug_info *d;
- char buf[8];
+ char buf[16];
int val;
ubi = ubi_get_device(ubi_num);
@@ -272,7 +352,12 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
val = d->emulate_bitflips;
else if (dent == d->dfs_emulate_io_failures)
val = d->emulate_io_failures;
- else if (dent == d->dfs_emulate_power_cut) {
+ else if (dent == d->dfs_emulate_failures) {
+ snprintf(buf, sizeof(buf), "0x%04x\n", d->emulate_failures);
+ count = simple_read_from_buffer(user_buf, count, ppos,
+ buf, strlen(buf));
+ goto out;
+ } else if (dent == d->dfs_emulate_power_cut) {
snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
count = simple_read_from_buffer(user_buf, count, ppos,
buf, strlen(buf));
@@ -287,8 +372,7 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
count = simple_read_from_buffer(user_buf, count, ppos,
buf, strlen(buf));
goto out;
- }
- else {
+ } else {
count = -EINVAL;
goto out;
}
@@ -316,7 +400,7 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
struct ubi_device *ubi;
struct ubi_debug_info *d;
size_t buf_size;
- char buf[8] = {0};
+ char buf[16] = {0};
int val;
ubi = ubi_get_device(ubi_num);
@@ -330,7 +414,11 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
goto out;
}
- if (dent == d->dfs_power_cut_min) {
+ if (dent == d->dfs_emulate_failures) {
+ if (kstrtouint(buf, 0, &d->emulate_failures) != 0)
+ count = -EINVAL;
+ goto out;
+ } else if (dent == d->dfs_power_cut_min) {
if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
count = -EINVAL;
goto out;
@@ -382,7 +470,6 @@ static const struct file_operations dfs_fops = {
.read = dfs_file_read,
.write = dfs_file_write,
.open = simple_open,
- .llseek = no_llseek,
.owner = THIS_MODULE,
};
@@ -504,60 +591,67 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
{
unsigned long ubi_num = ubi->ubi_num;
struct ubi_debug_info *d = &ubi->dbg;
+ umode_t mode = S_IRUSR | S_IWUSR;
int n;
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
- n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
+ n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN, UBI_DFS_DIR_NAME,
ubi->ubi_num);
- if (n > UBI_DFS_DIR_LEN) {
+ if (n >= UBI_DFS_DIR_LEN) {
/* The array size is too small */
return -EINVAL;
}
d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir);
- d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir,
+ d->dfs_chk_gen = debugfs_create_file("chk_gen", mode, d->dfs_dir,
(void *)ubi_num, &dfs_fops);
- d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir,
+ d->dfs_chk_io = debugfs_create_file("chk_io", mode, d->dfs_dir,
(void *)ubi_num, &dfs_fops);
- d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR,
+ d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", mode,
d->dfs_dir, (void *)ubi_num,
&dfs_fops);
- d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR,
+ d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", mode,
d->dfs_dir, (void *)ubi_num,
&dfs_fops);
d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips",
- S_IWUSR, d->dfs_dir,
+ mode, d->dfs_dir,
(void *)ubi_num,
&dfs_fops);
d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures",
- S_IWUSR, d->dfs_dir,
+ mode, d->dfs_dir,
(void *)ubi_num,
&dfs_fops);
d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut",
- S_IWUSR, d->dfs_dir,
+ mode, d->dfs_dir,
(void *)ubi_num,
&dfs_fops);
d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min",
- S_IWUSR, d->dfs_dir,
+ mode, d->dfs_dir,
(void *)ubi_num, &dfs_fops);
d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max",
- S_IWUSR, d->dfs_dir,
+ mode, d->dfs_dir,
(void *)ubi_num, &dfs_fops);
debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir,
(void *)ubi_num, &eraseblk_count_fops);
+#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
+ d->dfs_emulate_failures = debugfs_create_file("emulate_failures",
+ mode, d->dfs_dir,
+ (void *)ubi_num,
+ &dfs_fops);
+#endif
return 0;
}
@@ -599,7 +693,5 @@ int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
if (ubi->dbg.power_cut_counter)
return 0;
- ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
- ubi_ro_mode(ubi);
return 1;
}
generated by cgit (git 2.34.1) at 2025-12-21 18:33:30 +0000