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UBI: power cut emulation for testing
Emulate random power cuts by switching device to ro after a number of writes to allow simple power cut testing with nand-sim. Maximum and minimum number of successful writes before power cut and what kind of writes (EC header, VID header or none) to interrupt configurable via debugfs. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
parent
1a7e985dd1
commit
5026906742
@ -263,7 +263,7 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
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struct dentry *dent = file->f_path.dentry;
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struct ubi_device *ubi;
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struct ubi_debug_info *d;
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char buf[3];
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char buf[8];
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int val;
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ubi = ubi_get_device(ubi_num);
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@ -283,6 +283,22 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
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val = d->emulate_bitflips;
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else if (dent == d->dfs_emulate_io_failures)
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val = d->emulate_io_failures;
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else if (dent == d->dfs_emulate_power_cut) {
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snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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} else if (dent == d->dfs_power_cut_min) {
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snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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} else if (dent == d->dfs_power_cut_max) {
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snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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}
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else {
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count = -EINVAL;
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goto out;
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@ -311,7 +327,7 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
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struct ubi_device *ubi;
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struct ubi_debug_info *d;
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size_t buf_size;
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char buf[8];
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char buf[8] = {0};
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int val;
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ubi = ubi_get_device(ubi_num);
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@ -325,6 +341,21 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
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goto out;
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}
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if (dent == d->dfs_power_cut_min) {
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if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
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count = -EINVAL;
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goto out;
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} else if (dent == d->dfs_power_cut_max) {
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if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
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count = -EINVAL;
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goto out;
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} else if (dent == d->dfs_emulate_power_cut) {
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if (kstrtoint(buf, 0, &val) != 0)
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count = -EINVAL;
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d->emulate_power_cut = val;
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goto out;
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}
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if (buf[0] == '1')
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val = 1;
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else if (buf[0] == '0')
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@ -438,6 +469,27 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
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goto out_remove;
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d->dfs_emulate_io_failures = dent;
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fname = "tst_emulate_power_cut";
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dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
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&dfs_fops);
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if (IS_ERR_OR_NULL(dent))
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goto out_remove;
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d->dfs_emulate_power_cut = dent;
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fname = "tst_emulate_power_cut_min";
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dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
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&dfs_fops);
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if (IS_ERR_OR_NULL(dent))
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goto out_remove;
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d->dfs_power_cut_min = dent;
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fname = "tst_emulate_power_cut_max";
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dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
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&dfs_fops);
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if (IS_ERR_OR_NULL(dent))
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goto out_remove;
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d->dfs_power_cut_max = dent;
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return 0;
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out_remove:
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@ -458,3 +510,36 @@ void ubi_debugfs_exit_dev(struct ubi_device *ubi)
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if (IS_ENABLED(CONFIG_DEBUG_FS))
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debugfs_remove_recursive(ubi->dbg.dfs_dir);
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}
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/**
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* ubi_dbg_power_cut - emulate a power cut if it is time to do so
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* @ubi: UBI device description object
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* @caller: Flags set to indicate from where the function is being called
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*
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* Returns non-zero if a power cut was emulated, zero if not.
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*/
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int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
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{
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unsigned int range;
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if ((ubi->dbg.emulate_power_cut & caller) == 0)
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return 0;
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if (ubi->dbg.power_cut_counter == 0) {
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ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
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if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
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range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
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ubi->dbg.power_cut_counter += prandom_u32() % range;
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}
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return 0;
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}
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ubi->dbg.power_cut_counter--;
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if (ubi->dbg.power_cut_counter)
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return 0;
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ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
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ubi_ro_mode(ubi);
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return 1;
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}
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@ -137,4 +137,6 @@ static inline void ubi_enable_dbg_chk_fastmap(struct ubi_device *ubi)
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{
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ubi->dbg.chk_fastmap = 1;
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}
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int ubi_dbg_power_cut(struct ubi_device *ubi, int caller);
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#endif /* !__UBI_DEBUG_H__ */
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@ -859,6 +859,9 @@ int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
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if (err)
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return err;
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if (ubi_dbg_power_cut(ubi, POWER_CUT_EC_WRITE))
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return -EROFS;
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err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize);
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return err;
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}
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@ -1106,6 +1109,9 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
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if (err)
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return err;
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if (ubi_dbg_power_cut(ubi, POWER_CUT_VID_WRITE))
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return -EROFS;
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p = (char *)vid_hdr - ubi->vid_hdr_shift;
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err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
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ubi->vid_hdr_alsize);
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@ -151,6 +151,17 @@ enum {
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UBI_BAD_FASTMAP,
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};
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/*
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* Flags for emulate_power_cut in ubi_debug_info
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*
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* POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header
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* POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header
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*/
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enum {
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POWER_CUT_EC_WRITE = 0x01,
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POWER_CUT_VID_WRITE = 0x02,
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};
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/**
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* struct ubi_wl_entry - wear-leveling entry.
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* @u.rb: link in the corresponding (free/used) RB-tree
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@ -360,6 +371,10 @@ struct ubi_wl_entry;
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* @disable_bgt: disable the background task for testing purposes
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* @emulate_bitflips: emulate bit-flips for testing purposes
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* @emulate_io_failures: emulate write/erase failures for testing purposes
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* @emulate_power_cut: emulate power cut for testing purposes
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* @power_cut_counter: count down for writes left until emulated power cut
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* @power_cut_min: minimum number of writes before emulating a power cut
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* @power_cut_max: maximum number of writes until emulating a power cut
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* @dfs_dir_name: name of debugfs directory containing files of this UBI device
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* @dfs_dir: direntry object of the UBI device debugfs directory
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* @dfs_chk_gen: debugfs knob to enable UBI general extra checks
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@ -368,6 +383,9 @@ struct ubi_wl_entry;
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* @dfs_disable_bgt: debugfs knob to disable the background task
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* @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
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* @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
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* @dfs_emulate_power_cut: debugfs knob to emulate power cuts
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* @dfs_power_cut_min: debugfs knob for minimum writes before power cut
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* @dfs_power_cut_max: debugfs knob for maximum writes until power cut
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*/
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struct ubi_debug_info {
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unsigned int chk_gen:1;
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@ -376,6 +394,10 @@ struct ubi_debug_info {
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unsigned int disable_bgt:1;
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unsigned int emulate_bitflips:1;
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unsigned int emulate_io_failures:1;
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unsigned int emulate_power_cut:2;
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unsigned int power_cut_counter;
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unsigned int power_cut_min;
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unsigned int power_cut_max;
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char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
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struct dentry *dfs_dir;
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struct dentry *dfs_chk_gen;
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@ -384,6 +406,9 @@ struct ubi_debug_info {
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struct dentry *dfs_disable_bgt;
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struct dentry *dfs_emulate_bitflips;
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struct dentry *dfs_emulate_io_failures;
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struct dentry *dfs_emulate_power_cut;
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struct dentry *dfs_power_cut_min;
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struct dentry *dfs_power_cut_max;
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};
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/**
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