// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (c) International Business Machines Corp., 2006 * * Author: Artem Bityutskiy (Битюцкий Артём) */ #include "ubi.h"#include <linux/debugfs.h>#include <linux/uaccess.h>#include <linux/module.h>#include <linux/seq_file.h>#include <linux/fault-inject.h> #ifdef CONFIG_MTD_UBI_FAULT_INJECTIONstatic 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. * @ubi: UBI device description object * @pnum: the physical eraseblock number to dump * @offset: the starting offset within the physical eraseblock to dump * @len: the length of the region to dump */void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len){	int err;	size_t read;	void *buf;	loff_t addr = (loff_t)pnum * ubi->peb_size + offset; 	buf = vmalloc(len);	if (!buf)		return;	err = mtd_read(ubi->mtd, addr, len, &read, buf);	if (err && err != -EUCLEAN) {		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(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:	vfree(buf);	return;} /** * ubi_dump_ec_hdr - dump an erase counter header. * @ec_hdr: the erase counter header to dump */void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr){	pr_err("Erase counter header dump:\n");	pr_err("\tmagic          %#08x\n", be32_to_cpu(ec_hdr->magic));	pr_err("\tversion        %d\n", (int)ec_hdr->version);	pr_err("\tec             %llu\n", (long long)be64_to_cpu(ec_hdr->ec));	pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset));	pr_err("\tdata_offset    %d\n", be32_to_cpu(ec_hdr->data_offset));	pr_err("\timage_seq      %d\n", be32_to_cpu(ec_hdr->image_seq));	pr_err("\thdr_crc        %#08x\n", be32_to_cpu(ec_hdr->hdr_crc));	pr_err("erase counter header hexdump:\n");	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,		       ec_hdr, UBI_EC_HDR_SIZE, 1);} /** * ubi_dump_vid_hdr - dump a volume identifier header. * @vid_hdr: the volume identifier header to dump */void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr){	pr_err("Volume identifier header dump:\n");	pr_err("\tmagic     %08x\n", be32_to_cpu(vid_hdr->magic));	pr_err("\tversion   %d\n",  (int)vid_hdr->version);	pr_err("\tvol_type  %d\n",  (int)vid_hdr->vol_type);	pr_err("\tcopy_flag %d\n",  (int)vid_hdr->copy_flag);	pr_err("\tcompat    %d\n",  (int)vid_hdr->compat);	pr_err("\tvol_id    %d\n",  be32_to_cpu(vid_hdr->vol_id));	pr_err("\tlnum      %d\n",  be32_to_cpu(vid_hdr->lnum));	pr_err("\tdata_size %d\n",  be32_to_cpu(vid_hdr->data_size));	pr_err("\tused_ebs  %d\n",  be32_to_cpu(vid_hdr->used_ebs));	pr_err("\tdata_pad  %d\n",  be32_to_cpu(vid_hdr->data_pad));	pr_err("\tsqnum     %llu\n",		(unsigned long long)be64_to_cpu(vid_hdr->sqnum));	pr_err("\thdr_crc   %08x\n", be32_to_cpu(vid_hdr->hdr_crc));	pr_err("Volume identifier header hexdump:\n");	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,		       vid_hdr, UBI_VID_HDR_SIZE, 1);} /** * ubi_dump_vol_info - dump volume information. * @vol: UBI volume description object */void ubi_dump_vol_info(const struct ubi_volume *vol){	pr_err("Volume information dump:\n");	pr_err("\tvol_id          %d\n", vol->vol_id);	pr_err("\treserved_pebs   %d\n", vol->reserved_pebs);	pr_err("\talignment       %d\n", vol->alignment);	pr_err("\tdata_pad        %d\n", vol->data_pad);	pr_err("\tvol_type        %d\n", vol->vol_type);	pr_err("\tname_len        %d\n", vol->name_len);	pr_err("\tusable_leb_size %d\n", vol->usable_leb_size);	pr_err("\tused_ebs        %d\n", vol->used_ebs);	pr_err("\tused_bytes      %lld\n", vol->used_bytes);	pr_err("\tlast_eb_bytes   %d\n", vol->last_eb_bytes);	pr_err("\tcorrupted       %d\n", vol->corrupted);	pr_err("\tupd_marker      %d\n", vol->upd_marker);	pr_err("\tskip_check      %d\n", vol->skip_check); 	if (vol->name_len <= UBI_VOL_NAME_MAX &&	    strnlen(vol->name, vol->name_len + 1) == vol->name_len) {		pr_err("\tname            %s\n", vol->name);	} else {		pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",		       vol->name[0], vol->name[1], vol->name[2],		       vol->name[3], vol->name[4]);	}} /** * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object. * @r: the object to dump * @idx: volume table index */void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx){	int name_len = be16_to_cpu(r->name_len); 	pr_err("Volume table record %d dump:\n", idx);	pr_err("\treserved_pebs   %d\n", be32_to_cpu(r->reserved_pebs));	pr_err("\talignment       %d\n", be32_to_cpu(r->alignment));	pr_err("\tdata_pad        %d\n", be32_to_cpu(r->data_pad));	pr_err("\tvol_type        %d\n", (int)r->vol_type);	pr_err("\tupd_marker      %d\n", (int)r->upd_marker);	pr_err("\tname_len        %d\n", name_len); 	if (r->name[0] == '\0') {		pr_err("\tname            NULL\n");		return;	} 	if (name_len <= UBI_VOL_NAME_MAX &&	    strnlen(&r->name[0], name_len + 1) == name_len) {		pr_err("\tname            %s\n", &r->name[0]);	} else {		pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",			r->name[0], r->name[1], r->name[2], r->name[3],			r->name[4]);	}	pr_err("\tcrc             %#08x\n", be32_to_cpu(r->crc));} /** * ubi_dump_av - dump a &struct ubi_ainf_volume object. * @av: the object to dump */void ubi_dump_av(const struct ubi_ainf_volume *av){	pr_err("Volume attaching information dump:\n");	pr_err("\tvol_id         %d\n", av->vol_id);	pr_err("\thighest_lnum   %d\n", av->highest_lnum);	pr_err("\tleb_count      %d\n", av->leb_count);	pr_err("\tcompat         %d\n", av->compat);	pr_err("\tvol_type       %d\n", av->vol_type);	pr_err("\tused_ebs       %d\n", av->used_ebs);	pr_err("\tlast_data_size %d\n", av->last_data_size);	pr_err("\tdata_pad       %d\n", av->data_pad);} /** * ubi_dump_aeb - dump a &struct ubi_ainf_peb object. * @aeb: the object to dump * @type: object type: 0 - not corrupted, 1 - corrupted */void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type){	pr_err("eraseblock attaching information dump:\n");	pr_err("\tec       %d\n", aeb->ec);	pr_err("\tpnum     %d\n", aeb->pnum);	if (type == 0) {		pr_err("\tlnum     %d\n", aeb->lnum);		pr_err("\tscrub    %d\n", aeb->scrub);		pr_err("\tsqnum    %llu\n", aeb->sqnum);	}} /** * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object. * @req: the object to dump */void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req){	char nm[17]; 	pr_err("Volume creation request dump:\n");	pr_err("\tvol_id    %d\n",   req->vol_id);	pr_err("\talignment %d\n",   req->alignment);	pr_err("\tbytes     %lld\n", (long long)req->bytes);	pr_err("\tvol_type  %d\n",   req->vol_type);	pr_err("\tname_len  %d\n",   req->name_len); 	memcpy(nm, req->name, 16);	nm[16] = 0;	pr_err("\t1st 16 characters of name: %s\n", nm);} /* * Root directory for UBI stuff in debugfs. Contains sub-directories which * contain the stuff specific to particular UBI devices. */static struct dentry *dfs_rootdir; #ifdef CONFIG_MTD_UBI_FAULT_INJECTIONstatic 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. * * Create UBI debugfs directory. Returns zero in case of success and a negative * error code in case of failure. */int ubi_debugfs_init(void){	if (!IS_ENABLED(CONFIG_DEBUG_FS))		return 0; 	dfs_rootdir = debugfs_create_dir("ubi", NULL);	if (IS_ERR_OR_NULL(dfs_rootdir)) {		int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV; 		pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",		       err);		return err;	} #ifdef CONFIG_MTD_UBI_FAULT_INJECTION	dfs_create_fault_entry(dfs_rootdir);#endif 	return 0;} /** * ubi_debugfs_exit - remove UBI debugfs directory. */void ubi_debugfs_exit(void){	if (IS_ENABLED(CONFIG_DEBUG_FS))		debugfs_remove(dfs_rootdir);} /* Read an UBI debugfs file */static ssize_t dfs_file_read(struct file *file, char __user *user_buf,			     size_t count, loff_t *ppos){	unsigned long ubi_num = (unsigned long)file->private_data;	struct dentry *dent = file->f_path.dentry;	struct ubi_device *ubi;	struct ubi_debug_info *d;	char buf[16];	int val; 	ubi = ubi_get_device(ubi_num);	if (!ubi)		return -ENODEV;	d = &ubi->dbg; 	if (dent == d->dfs_chk_gen)		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_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));		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;	} 	if (val)		buf[0] = '1';	else		buf[0] = '0';	buf[1] = '\n';	buf[2] = 0x00; 	count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); out:	ubi_put_device(ubi);	return count;} /* Write an UBI debugfs file */static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,			      size_t count, loff_t *ppos){	unsigned long ubi_num = (unsigned long)file->private_data;	struct dentry *dent = file->f_path.dentry;	struct ubi_device *ubi;	struct ubi_debug_info *d;	size_t buf_size;	char buf[16] = {0};	int val; 	ubi = ubi_get_device(ubi_num);	if (!ubi)		return -ENODEV;	d = &ubi->dbg; 	buf_size = min_t(size_t, count, (sizeof(buf) - 1));	if (copy_from_user(buf, user_buf, buf_size)) {		count = -EFAULT;		goto out;	} 	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;	} 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;		else			d->emulate_power_cut = val;		goto out;	} 	if (buf[0] == '1')		val = 1;	else if (buf[0] == '0')		val = 0;	else {		count = -EINVAL;		goto out;	} 	if (dent == d->dfs_chk_gen)		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)		d->emulate_bitflips = val;	else if (dent == d->dfs_emulate_io_failures)		d->emulate_io_failures = val;	else		count = -EINVAL; out:	ubi_put_device(ubi);	return count;} /* File operations for all UBI debugfs files except * detailed_erase_block_info */static const struct file_operations dfs_fops = {	.read   = dfs_file_read,	.write  = dfs_file_write,	.open	= simple_open,	.owner  = THIS_MODULE,}; /* As long as the position is less then that total number of erase blocks, * we still have more to print. */static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos){	struct ubi_device *ubi = s->private; 	if (*pos < ubi->peb_count)		return pos; 	return NULL;} /* Since we are using the position as the iterator, we just need to check if we * are done and increment the position. */static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos){	struct ubi_device *ubi = s->private; 	(*pos)++; 	if (*pos < ubi->peb_count)		return pos; 

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