1 // SPDX-License-Identifier: GPL-2.0-only
3  * crash.c - kernel crash support code.
4  * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
32 	.end   = 0,
39 	.end   = 0,
54  *   crashkernel=ramsize-range:size[,...][@offset]
56  * The function returns 0 on success and -EINVAL on failure.
74 	/* for each entry of the comma-separated list */  in parse_crashkernel_mem()
76 		unsigned long long start, end = ULLONG_MAX, size;  in parse_crashkernel_mem()  local
82 			return -EINVAL;  in parse_crashkernel_mem()
85 		if (*cur != '-') {  in parse_crashkernel_mem()
86 			pr_warn("crashkernel: '-' expected\n");  in parse_crashkernel_mem()
87 			return -EINVAL;  in parse_crashkernel_mem()
91 		/* if no ':' is here, than we read the end */  in parse_crashkernel_mem()
93 			end = memparse(cur, &tmp);  in parse_crashkernel_mem()
96 				return -EINVAL;  in parse_crashkernel_mem()
99 			if (end <= start) {  in parse_crashkernel_mem()
100 				pr_warn("crashkernel: end <= start\n");  in parse_crashkernel_mem()
101 				return -EINVAL;  in parse_crashkernel_mem()
107 			return -EINVAL;  in parse_crashkernel_mem()
114 			return -EINVAL;  in parse_crashkernel_mem()
119 			return -EINVAL;  in parse_crashkernel_mem()
123 		if (total_mem >= start && total_mem < end) {  in parse_crashkernel_mem()
137 				return -EINVAL;  in parse_crashkernel_mem()
151  * It returns 0 on success and -EINVAL on failure.
162 		return -EINVAL;  in parse_crashkernel_simple()
169 		return -EINVAL;  in parse_crashkernel_simple()
180 	[SUFFIX_HIGH] = ",high",
189  *	crashkernel=size,[high|low|cma]
191  * It returns 0 on success and -EINVAL on failure.
202 		return -EINVAL;  in parse_crashkernel_suffix()
208 		return -EINVAL;  in parse_crashkernel_suffix()
213 		return -EINVAL;  in parse_crashkernel_suffix()
239 				q = end_p - strlen(suffix_tbl[i]);  in get_last_crashkernel()
246 			q = end_p - strlen(suffix);  in get_last_crashkernel()
273 		return -ENOENT;  in __parse_crashkernel()
282 	 * syntax -- if not, it must be the classic syntax  in __parse_crashkernel()
295  * called from the arch-specific code.
297  * If crashkernel=,high|low is supported on architecture, non-NULL values
298  * should be passed to parameters 'low_size' and 'high'.
306 			     bool *high)  in parse_crashkernel()  argument
316 	 * If non-NULL 'high' passed in and no normal crashkernel  in parse_crashkernel()
317 	 * setting detected, try parsing crashkernel=,high|low.  in parse_crashkernel()
319 	if (high && ret == -ENOENT) {  in parse_crashkernel()
323 			return -EINVAL;  in parse_crashkernel()
331 		if (ret == -ENOENT) {  in parse_crashkernel()
338 		*high = true;  in parse_crashkernel()
350 		ret = -EINVAL;  in parse_crashkernel()
353 		ret = -EINVAL;  in parse_crashkernel()
377 		return -ENOMEM;  in reserve_crashkernel_low()
380 	pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",  in reserve_crashkernel_low()
384 	crashk_low_res.end   = low_base + low_size - 1;  in reserve_crashkernel_low()
395 					bool high)  in reserve_crashkernel_generic()  argument
405 	} else if (high) {  in reserve_crashkernel_generic()
419 			pr_warn("crashkernel reservation failed - memory is in use.\n");  in reserve_crashkernel_generic()
425 		 * low memory, fall back to high memory, the minimum required  in reserve_crashkernel_generic()
428 		if (!high && search_end == CRASH_ADDR_LOW_MAX) {  in reserve_crashkernel_generic()
436 		 * For crashkernel=size[KMG],high, if the first attempt was  in reserve_crashkernel_generic()
437 		 * for high memory, fall back to low memory.  in reserve_crashkernel_generic()
439 		if (high && search_end == CRASH_ADDR_HIGH_MAX) {  in reserve_crashkernel_generic()
456 	pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",  in reserve_crashkernel_generic()
464 	if (crashk_low_res.end)  in reserve_crashkernel_generic()
468 	crashk_res.end = crash_base + crash_size - 1;  in reserve_crashkernel_generic()
492 			/* reservation failed, try half-sized blocks */  in reserve_crashkernel_cma()
501 		crashk_cma_ranges[crashk_cma_cnt].end =  in reserve_crashkernel_cma()
503 			cma_get_size(res) - 1;  in reserve_crashkernel_cma()
527 	if (crashk_res.start < crashk_res.end)  in insert_crashkernel_resources()
530 	if (crashk_low_res.start < crashk_low_res.end)  in insert_crashkernel_resources()