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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.c115
1 files changed, 108 insertions, 7 deletions
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 6dcc4e4844..c35c85b18c 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -33,12 +33,12 @@ void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
return;
err = mtd_read(ubi->mtd, addr, len, &read, buf);
if (err && err != -EUCLEAN) {
- ubi_err("error %d while reading %d bytes from PEB %d:%d, read %zd bytes",
+ ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes",
err, len, pnum, offset, read);
goto out;
}
- ubi_msg("dumping %d bytes of data from PEB %d, offset %d",
+ ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d",
len, pnum, offset);
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
out:
@@ -229,8 +229,8 @@ int ubi_debugfs_init(void)
if (IS_ERR_OR_NULL(dfs_rootdir)) {
int err = dfs_rootdir ? -ENODEV : PTR_ERR(dfs_rootdir);
- ubi_err("cannot create \"ubi\" debugfs directory, error %d\n",
- err);
+ pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",
+ err);
return err;
}
@@ -254,7 +254,7 @@ 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[3];
+ char buf[8];
int val;
ubi = ubi_get_device(ubi_num);
@@ -266,12 +266,30 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
val = d->chk_gen;
else if (dent == d->dfs_chk_io)
val = d->chk_io;
+ else if (dent == d->dfs_chk_fastmap)
+ val = d->chk_fastmap;
else if (dent == d->dfs_disable_bgt)
val = d->disable_bgt;
else if (dent == d->dfs_emulate_bitflips)
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) {
+ snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
+ count = simple_read_from_buffer(user_buf, count, ppos,
+ buf, strlen(buf));
+ goto out;
+ } else if (dent == d->dfs_power_cut_min) {
+ snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
+ count = simple_read_from_buffer(user_buf, count, ppos,
+ buf, strlen(buf));
+ goto out;
+ } else if (dent == d->dfs_power_cut_max) {
+ snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
+ count = simple_read_from_buffer(user_buf, count, ppos,
+ buf, strlen(buf));
+ goto out;
+ }
else {
count = -EINVAL;
goto out;
@@ -300,7 +318,7 @@ 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];
+ char buf[8] = {0};
int val;
ubi = ubi_get_device(ubi_num);
@@ -314,6 +332,21 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
goto out;
}
+ if (dent == d->dfs_power_cut_min) {
+ if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
+ count = -EINVAL;
+ goto out;
+ } else if (dent == d->dfs_power_cut_max) {
+ if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
+ count = -EINVAL;
+ goto out;
+ } else if (dent == d->dfs_emulate_power_cut) {
+ if (kstrtoint(buf, 0, &val) != 0)
+ count = -EINVAL;
+ d->emulate_power_cut = val;
+ goto out;
+ }
+
if (buf[0] == '1')
val = 1;
else if (buf[0] == '0')
@@ -327,6 +360,8 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
d->chk_gen = val;
else if (dent == d->dfs_chk_io)
d->chk_io = val;
+ else if (dent == d->dfs_chk_fastmap)
+ d->chk_fastmap = val;
else if (dent == d->dfs_disable_bgt)
d->disable_bgt = val;
else if (dent == d->dfs_emulate_bitflips)
@@ -397,6 +432,13 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
goto out_remove;
d->dfs_chk_io = dent;
+ fname = "chk_fastmap";
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
+ &dfs_fops);
+ if (IS_ERR_OR_NULL(dent))
+ goto out_remove;
+ d->dfs_chk_fastmap = dent;
+
fname = "tst_disable_bgt";
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
&dfs_fops);
@@ -418,13 +460,34 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
goto out_remove;
d->dfs_emulate_io_failures = dent;
+ fname = "tst_emulate_power_cut";
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
+ &dfs_fops);
+ if (IS_ERR_OR_NULL(dent))
+ goto out_remove;
+ d->dfs_emulate_power_cut = dent;
+
+ fname = "tst_emulate_power_cut_min";
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
+ &dfs_fops);
+ if (IS_ERR_OR_NULL(dent))
+ goto out_remove;
+ d->dfs_power_cut_min = dent;
+
+ fname = "tst_emulate_power_cut_max";
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
+ &dfs_fops);
+ if (IS_ERR_OR_NULL(dent))
+ goto out_remove;
+ d->dfs_power_cut_max = dent;
+
return 0;
out_remove:
debugfs_remove_recursive(d->dfs_dir);
out:
err = dent ? PTR_ERR(dent) : -ENODEV;
- ubi_err("cannot create \"%s\" debugfs file or directory, error %d\n",
+ ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n",
fname, err);
return err;
}
@@ -438,6 +501,39 @@ void ubi_debugfs_exit_dev(struct ubi_device *ubi)
if (IS_ENABLED(CONFIG_DEBUG_FS))
debugfs_remove_recursive(ubi->dbg.dfs_dir);
}
+
+/**
+ * ubi_dbg_power_cut - emulate a power cut if it is time to do so
+ * @ubi: UBI device description object
+ * @caller: Flags set to indicate from where the function is being called
+ *
+ * Returns non-zero if a power cut was emulated, zero if not.
+ */
+int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
+{
+ unsigned int range;
+
+ if ((ubi->dbg.emulate_power_cut & caller) == 0)
+ return 0;
+
+ if (ubi->dbg.power_cut_counter == 0) {
+ ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
+
+ if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
+ range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
+ ubi->dbg.power_cut_counter += prandom_u32() % range;
+ }
+ return 0;
+ }
+
+ ubi->dbg.power_cut_counter--;
+ if (ubi->dbg.power_cut_counter)
+ return 0;
+
+ ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
+ ubi_ro_mode(ubi);
+ return 1;
+}
#else
int ubi_debugfs_init(void)
{
@@ -456,4 +552,9 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
void ubi_debugfs_exit_dev(struct ubi_device *ubi)
{
}
+
+int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
+{
+ return 0;
+}
#endif
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