1 // SPDX-License-Identifier: GPL-2.0-or-later
51 	.name = "ibm,rtas-log",
54 	.index = -1,
60 	.name = "lnx,oops-log",
63 	.index = -1,
69 	"ibm,rtas-log",
71 	"lnx,oops-log",
79 	.dump = oops_to_nvram
83  * For capturing and compressing an oops or panic report...
87  * oops_buf[] holds the compressed text, preceded by a oops header.
88  * oops header has u16 holding the version of oops header (to differentiate
95  * +- oops_buf
96  * |                                   +- oops_data
98  * +-----------+-----------+-----------+------------------------+
101  * +-----------+-----------+-----------+------------------------+
103  * +- oops_log_info
105  * We preallocate these buffers during init to avoid kmalloc during oops/panic.
122 	.index = -1,
129 	.name = "of-config",
130 	.index = -1,
137 	.index = -1,
144 	-1,
145 	-1,
146 	-1
155  * is no way to guarantee that the OS or the machine is in a state to
158  * IO address, there is no way of guaranteeing that the device driver
165  * +-----------+----------+--------+------------+------------------+
167  * |0          |1         |2      3|4         15|16        length-1|
168  * +-----------+----------+--------+------------+------------------+
171  * +--------------+------------+-----------------------------------+
173  * |0            3|4          7|8                  error_log_size-1|
174  * +--------------+------------+-----------------------------------+
189 	if (part->index == -1)  in nvram_write_os_partition()
190 		return -ESPIPE;  in nvram_write_os_partition()
192 	if (length > part->size)  in nvram_write_os_partition()
193 		length = part->size;  in nvram_write_os_partition()
198 	tmp_index = part->index;  in nvram_write_os_partition()
227 	if (part->index == -1)  in nvram_read_partition()
228 		return -1;  in nvram_read_partition()
230 	if (length > part->size)  in nvram_read_partition()
231 		length = part->size;  in nvram_read_partition()
233 	tmp_index = part->index;  in nvram_read_partition()
235 	if (part->os_partition) {  in nvram_read_partition()
249 	if (part->os_partition) {  in nvram_read_partition()
263  *	- If it's large enough, use it.
264  *	- Otherwise, recycle it and keep going.
272  * Returns 0 on success, else -1.
280 	p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);  in nvram_init_os_partition()
283 	if (p && size < part->min_size) {  in nvram_init_os_partition()
285 					" removing it...\n", part->name);  in nvram_init_os_partition()
286 		nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);  in nvram_init_os_partition()
292 		p = nvram_create_partition(part->name, NVRAM_SIG_OS,  in nvram_init_os_partition()
293 					part->req_size, part->min_size);  in nvram_init_os_partition()
294 		if (p == -ENOSPC) {  in nvram_init_os_partition()
295 			pr_info("nvram: No room to create %s partition, "  in nvram_init_os_partition()
297 				part->name);  in nvram_init_os_partition()
300 			p = nvram_create_partition(part->name, NVRAM_SIG_OS,  in nvram_init_os_partition()
301 					part->req_size, part->min_size);  in nvram_init_os_partition()
307 		       " partition, err %d\n", part->name, (int)p);  in nvram_init_os_partition()
308 		return -1;  in nvram_init_os_partition()
311 	part->index = p;  in nvram_init_os_partition()
312 	part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);  in nvram_init_os_partition()
323 	ret = -EIO;  in nvram_compress()
360 		pr_err("nvram: logging uncompressed oops/panic report\n");  in zip_oops()
361 		return -1;  in zip_oops()
363 	oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);  in zip_oops()
364 	oops_hdr->report_length = cpu_to_be16(zipped_len);  in zip_oops()
365 	oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());  in zip_oops()
373 	read_type = -1;  in nvram_pstore_open()
378  * nvram_pstore_write - pstore write callback for nvram
381  * Called by pstore_dump() when an oops or panic report is logged in the
392 	if (record->part > 1 || (record->type != PSTORE_TYPE_DMESG))  in nvram_pstore_write()
393 		return -1;  in nvram_pstore_write()
396 		return -1;  in nvram_pstore_write()
398 	oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);  in nvram_pstore_write()
399 	oops_hdr->report_length = cpu_to_be16(record->size);  in nvram_pstore_write()
400 	oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());  in nvram_pstore_write()
402 	if (record->compressed)  in nvram_pstore_write()
406 		(int) (sizeof(*oops_hdr) + record->size), err_type,  in nvram_pstore_write()
407 		record->count);  in nvram_pstore_write()
412 	record->id = record->part;  in nvram_pstore_write()
417  * Reads the oops/panic report, rtas, of-config and common partition.
435 		record->type = PSTORE_TYPE_DMESG;  in nvram_pstore_read()
440 		record->type = PSTORE_TYPE_PPC_COMMON;  in nvram_pstore_read()
441 		record->id = PSTORE_TYPE_PPC_COMMON;  in nvram_pstore_read()
442 		record->time.tv_sec = 0;  in nvram_pstore_read()
443 		record->time.tv_nsec = 0;  in nvram_pstore_read()
448 		record->type = PSTORE_TYPE_PPC_RTAS;  in nvram_pstore_read()
449 		record->time.tv_sec = last_rtas_event;  in nvram_pstore_read()
450 		record->time.tv_nsec = 0;  in nvram_pstore_read()
455 		record->type = PSTORE_TYPE_PPC_OF;  in nvram_pstore_read()
456 		record->id = PSTORE_TYPE_PPC_OF;  in nvram_pstore_read()
457 		record->time.tv_sec = 0;  in nvram_pstore_read()
458 		record->time.tv_nsec = 0;  in nvram_pstore_read()
465 		record->type = PSTORE_TYPE_PPC_OPAL;  in nvram_pstore_read()
466 		record->id = PSTORE_TYPE_PPC_OPAL;  in nvram_pstore_read()
467 		record->time.tv_sec = 0;  in nvram_pstore_read()
468 		record->time.tv_nsec = 0;  in nvram_pstore_read()
475 	if (!part->os_partition) {  in nvram_pstore_read()
476 		p = nvram_find_partition(part->name, sig, &size);  in nvram_pstore_read()
479 				"err %d\n", part->name, (int)p);  in nvram_pstore_read()
482 		part->index = p;  in nvram_pstore_read()
483 		part->size = size;  in nvram_pstore_read()
486 	buff = kmalloc(part->size, GFP_KERNEL);  in nvram_pstore_read()
489 		return -ENOMEM;  in nvram_pstore_read()
491 	if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {  in nvram_pstore_read()
496 	record->count = 0;  in nvram_pstore_read()
498 	if (part->os_partition)  in nvram_pstore_read()
499 		record->id = id_no;  in nvram_pstore_read()
505 		if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {  in nvram_pstore_read()
506 			/* Old format oops header had 2-byte record size */  in nvram_pstore_read()
508 			length = be16_to_cpu(oops_hdr->version);  in nvram_pstore_read()
509 			record->time.tv_sec = 0;  in nvram_pstore_read()
510 			record->time.tv_nsec = 0;  in nvram_pstore_read()
513 			length = be16_to_cpu(oops_hdr->report_length);  in nvram_pstore_read()
514 			record->time.tv_sec = be64_to_cpu(oops_hdr->timestamp);  in nvram_pstore_read()
515 			record->time.tv_nsec = 0;  in nvram_pstore_read()
517 		record->buf = kmemdup(buff + hdr_size, length, GFP_KERNEL);  in nvram_pstore_read()
519 		if (record->buf == NULL)  in nvram_pstore_read()
520 			return -ENOMEM;  in nvram_pstore_read()
522 		record->ecc_notice_size = 0;  in nvram_pstore_read()
524 			record->compressed = true;  in nvram_pstore_read()
526 			record->compressed = false;  in nvram_pstore_read()
530 	record->buf = buff;  in nvram_pstore_read()
531 	return part->size;  in nvram_pstore_read()
557 	if (rc && (rc != -EPERM))  in nvram_pstore_init()
567 	return -1;  in nvram_pstore_init()
579 			pr_err("nvram: Failed to initialize oops partition!");  in nvram_init_oops_partition()
583 			" RTAS errors and oops/panic reports\n",  in nvram_init_oops_partition()
588 		pr_err("nvram: Failed to initialize oops partition!");  in nvram_init_oops_partition()
594 		pr_err("nvram: No memory for %s partition\n",  in nvram_init_oops_partition()
599 	oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);  in nvram_init_oops_partition()
608 	 * severity prefix) will reduce the oops/panic report to at most  in nvram_init_oops_partition()
617 			pr_err("nvram: No memory for compression workspace; "  in nvram_init_oops_partition()
624 		pr_err("No memory for uncompressed %s data; "  in nvram_init_oops_partition()
639  * This is our kmsg_dump callback, called after an oops or panic report
642  * that we think will compress sufficiently to fit in the lnx,oops-log
656 	int rc = -1;  in oops_to_nvram()
695 		oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);  in oops_to_nvram()
696 		oops_hdr->report_length = cpu_to_be16(text_len);  in oops_to_nvram()
697 		oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());  in oops_to_nvram()
712 	printk(KERN_WARNING "--------%s---------\n", label);  in nvram_print_partitions()
716 		       tmp_part->index, tmp_part->header.signature,  in nvram_print_partitions()
717 		       tmp_part->header.checksum, tmp_part->header.length,  in nvram_print_partitions()
718 		       tmp_part->header.name);  in nvram_print_partitions()
730 	memcpy(&phead, &part->header, NVRAM_HEADER_LEN);  in nvram_write_header()
733 	tmp_index = part->index;  in nvram_write_header()
743 	unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */  in nvram_checksum()
744 	c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];  in nvram_checksum()
761 	if (part->header.signature != sig)  in nvram_can_remove_partition()
764 		if (strncmp(name, part->header.name, 12))  in nvram_can_remove_partition()
769 			if (!strncmp(*except, part->header.name, 12))  in nvram_can_remove_partition()
777  * nvram_remove_partition - Remove one or more partitions in nvram
796 		part->header.signature = NVRAM_SIG_FREE;  in nvram_remove_partition()
797 		memset(part->header.name, 'w', 12);  in nvram_remove_partition()
798 		part->header.checksum = nvram_checksum(&part->header);  in nvram_remove_partition()
809 		if (part->header.signature != NVRAM_SIG_FREE) {  in nvram_remove_partition()
814 			prev->header.length += part->header.length;  in nvram_remove_partition()
815 			prev->header.checksum = nvram_checksum(&prev->header);  in nvram_remove_partition()
821 			list_del(&part->partition);  in nvram_remove_partition()
831  * nvram_create_partition - Create a partition in nvram
860 	/* If no minimum size specified, make it the same as the  in nvram_create_partition()
866 		return -EINVAL;  in nvram_create_partition()
875 		if (part->header.signature != NVRAM_SIG_FREE)  in nvram_create_partition()
878 		if (part->header.length >= req_size) {  in nvram_create_partition()
883 		if (part->header.length > size &&  in nvram_create_partition()
884 		    part->header.length >= min_size) {  in nvram_create_partition()
885 			size = part->header.length;  in nvram_create_partition()
890 		return -ENOSPC;  in nvram_create_partition()
896 		return -ENOMEM;  in nvram_create_partition()
899 	new_part->index = free_part->index;  in nvram_create_partition()
900 	new_part->header.signature = sig;  in nvram_create_partition()
901 	new_part->header.length = size;  in nvram_create_partition()
902 	memcpy(new_part->header.name, name, strnlen(name, sizeof(new_part->header.name)));  in nvram_create_partition()
903 	new_part->header.checksum = nvram_checksum(&new_part->header);  in nvram_create_partition()
911 	list_add_tail(&new_part->partition, &free_part->partition);  in nvram_create_partition()
914 	if (free_part->header.length > size) {  in nvram_create_partition()
915 		free_part->index += size * NVRAM_BLOCK_LEN;  in nvram_create_partition()
916 		free_part->header.length -= size;  in nvram_create_partition()
917 		free_part->header.checksum = nvram_checksum(&free_part->header);  in nvram_create_partition()
925 		list_del(&free_part->partition);  in nvram_create_partition()
930 	for (tmp_index = new_part->index + NVRAM_HEADER_LEN;  in nvram_create_partition()
931 	     tmp_index <  ((size - 1) * NVRAM_BLOCK_LEN);  in nvram_create_partition()
941 	return new_part->index + NVRAM_HEADER_LEN;  in nvram_create_partition()
945  * nvram_get_partition_size - Get the data size of an nvram partition
955 		if (part->index + NVRAM_HEADER_LEN == data_index)  in nvram_get_partition_size()
956 			return (part->header.length - 1) * NVRAM_BLOCK_LEN;  in nvram_get_partition_size()
958 	return -1;  in nvram_get_partition_size()
963  * nvram_find_partition - Find an nvram partition by signature and name
966  * @out_size: if non-NULL, returns the size of the data part of the partition
973 		if (p->header.signature == sig &&  in nvram_find_partition()
974 		    (!name || !strncmp(p->header.name, name, 12))) {  in nvram_find_partition()
976 				*out_size = (p->header.length - 1) *  in nvram_find_partition()
978 			return p->index + NVRAM_HEADER_LEN;  in nvram_find_partition()
995 		return -ENODEV;  in nvram_scan_partitions()
1001 		return -ENOMEM;  in nvram_scan_partitions()
1013 		cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */  in nvram_scan_partitions()
1030 			       "detected: 0-length partition\n");  in nvram_scan_partitions()
1034 		err = -ENOMEM;  in nvram_scan_partitions()
1040 		memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);  in nvram_scan_partitions()
1041 		tmp_part->index = cur_index;  in nvram_scan_partitions()
1042 		list_add_tail(&tmp_part->partition, &nvram_partitions);  in nvram_scan_partitions()