/* * Copyright (c) International Business Machines Corp., 2006 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Author: Artem Bityutskiy (Битюцкий Артём) */ #include "ubi.h"#include <linux/debugfs.h>#include <linux/uaccess.h>#include <linux/module.h>  /** * 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("error %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",		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); 	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; /** * 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 ? -ENODEV : PTR_ERR(dfs_rootdir); 		ubi_err("cannot create \"ubi\" debugfs directory, error %d\n",			err);		return err;	} 	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[3];	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_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 {		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[8];	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 (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_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 */static const struct file_operations dfs_fops = {	.read   = dfs_file_read,	.write  = dfs_file_write,	.open	= simple_open,	.llseek = no_llseek,	.owner  = THIS_MODULE,}; /** * ubi_debugfs_init_dev - initialize debugfs for an UBI device. * @ubi: UBI device description object * * This function creates all debugfs files for UBI device @ubi. Returns zero in * case of success and a negative error code in case of failure. */int ubi_debugfs_init_dev(struct ubi_device *ubi){	int err, n;	unsigned long ubi_num = ubi->ubi_num;	const char *fname;	struct dentry *dent;	struct ubi_debug_info *d = &ubi->dbg; 	if (!IS_ENABLED(CONFIG_DEBUG_FS))		return 0; 	n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,		     ubi->ubi_num);	if (n == UBI_DFS_DIR_LEN) {		/* The array size is too small */		fname = UBI_DFS_DIR_NAME;		dent = ERR_PTR(-EINVAL);		goto out;	} 	fname = d->dfs_dir_name;	dent = debugfs_create_dir(fname, dfs_rootdir);	if (IS_ERR_OR_NULL(dent))		goto out;	d->dfs_dir = dent; 	fname = "chk_gen";	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_gen = dent; 	fname = "chk_io";	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_io = dent; 	fname = "tst_disable_bgt";	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_disable_bgt = dent; 	fname = "tst_emulate_bitflips";	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_bitflips = dent; 	fname = "tst_emulate_io_failures";	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_io_failures = 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",		fname, err);	return err;} /** * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi * @ubi: UBI device description object */void ubi_debugfs_exit_dev(struct ubi_device *ubi){	if (IS_ENABLED(CONFIG_DEBUG_FS))		debugfs_remove_recursive(ubi->dbg.dfs_dir);}