1 // SPDX-License-Identifier: GPL-2.0
3  * Implements pstore backend driver that write to block (or non-block) storage
24 MODULE_PARM_DESC(kmsg_size, "kmsg dump record size in kbytes");
29 		 "maximum reason for kmsg dump (default 2: Oops and Panic)");
34 static long pmsg_size = -1;
42 static long console_size = -1;
50 static long ftrace_size = -1;
60  * blkdev - the block device to use for pstore storage
61  * See Documentation/admin-guide/pstore-blk.rst for details.
78 	if (_##name_ & ((alignsize) - 1)) {			\
94 	dev->zone.name = _##name_;				\
105 		return -EINVAL;  in __register_pstore_device()
107 	if (!dev->zone.total_size) {  in __register_pstore_device()
109 		return -EINVAL;  in __register_pstore_device()
111 	if (!dev->zone.read) {  in __register_pstore_device()
112 		pr_err("no read handler for device\n");  in __register_pstore_device()
113 		return -EINVAL;  in __register_pstore_device()
115 	if (!dev->zone.write) {  in __register_pstore_device()
116 		pr_err("no write handler for device\n");  in __register_pstore_device()
117 		return -EINVAL;  in __register_pstore_device()
122 		return -EBUSY;  in __register_pstore_device()
125 	if (!dev->flags)  in __register_pstore_device()
126 		dev->flags = UINT_MAX;  in __register_pstore_device()
129 	verify_size(kmsg_size, 4096, dev->flags & PSTORE_FLAGS_DMESG);  in __register_pstore_device()
130 	verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG);  in __register_pstore_device()
131 	verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE);  in __register_pstore_device()
132 	verify_size(ftrace_size, 4096, dev->flags & PSTORE_FLAGS_FTRACE);  in __register_pstore_device()
133 	dev->zone.max_reason = max_reason;  in __register_pstore_device()
136 	dev->zone.name = KBUILD_MODNAME;  in __register_pstore_device()
137 	dev->zone.owner = THIS_MODULE;  in __register_pstore_device()
139 	ret = register_pstore_zone(&dev->zone);  in __register_pstore_device()
146  * register_pstore_device() - register non-block device to pstore/blk
148  * @dev: non-block device information
151  * * 0		- OK
152  * * Others	- something error.
170 		unregister_pstore_zone(&dev->zone);  in __unregister_pstore_device()
176  * unregister_pstore_device() - unregister non-block device from pstore/blk
178  * @dev: non-block device information
198 		return -EBUSY;  in psblk_generic_blk_write()
208 	int ret = -ENODEV;  in __register_pstore_blk()
219 	if (!S_ISBLK(file_inode(psblk_file)->i_mode)) {  in __register_pstore_blk()
224 	dev->zone.total_size =  in __register_pstore_blk()
225 		bdev_nr_bytes(I_BDEV(psblk_file->f_mapping->host));  in __register_pstore_blk()
244 	strscpy(info->device, blkdev);  in pstore_blk_get_config()
245 	info->max_reason = max_reason;  in pstore_blk_get_config()
246 	info->kmsg_size = check_size(kmsg_size, 4096);  in pstore_blk_get_config()
247 	info->pmsg_size = check_size(pmsg_size, 4096);  in pstore_blk_get_config()
248 	info->ftrace_size = check_size(ftrace_size, 4096);  in pstore_blk_get_config()
249 	info->console_size = check_size(console_size, 4096);  in pstore_blk_get_config()
257 static const char devname[] = "/dev/pstore-blk";
262 	 * mounted yet, and no device nodes are present yet. Use the  in early_boot_devpath()
290 	/* No best-effort mode requested. */  in __best_effort_init()
297 		return -EINVAL;  in __best_effort_init()
302 		return -ENOMEM;  in __best_effort_init()
304 	best_effort_dev->zone.read = psblk_generic_blk_read;  in __best_effort_init()
305 	best_effort_dev->zone.write = psblk_generic_blk_write;  in __best_effort_init()
312 		pr_info("attached %s (%lu) (no dedicated panic_write!)\n",  in __best_effort_init()
313 			blkdev, best_effort_dev->zone.total_size);  in __best_effort_init()