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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_S390_MEM_DETECT_H
3#define _ASM_S390_MEM_DETECT_H
4
5#include <linux/types.h>
6#include <asm/page.h>
7
8enum physmem_info_source {
9 MEM_DETECT_NONE = 0,
10 MEM_DETECT_SCLP_STOR_INFO,
11 MEM_DETECT_DIAG260,
12 MEM_DETECT_DIAG500_STOR_LIMIT,
13 MEM_DETECT_SCLP_READ_INFO,
14 MEM_DETECT_BIN_SEARCH
15};
16
17struct physmem_range {
18 u64 start;
19 u64 end;
20};
21
22enum reserved_range_type {
23 RR_DECOMPRESSOR,
24 RR_INITRD,
25 RR_VMLINUX,
26 RR_AMODE31,
27 RR_IPLREPORT,
28 RR_CERT_COMP_LIST,
29 RR_MEM_DETECT_EXT,
30 RR_VMEM,
31 RR_MAX
32};
33
34struct reserved_range {
35 unsigned long start;
36 unsigned long end;
37 struct reserved_range *chain;
38};
39
40/*
41 * Storage element id is defined as 1 byte (up to 256 storage elements).
42 * In practise only storage element id 0 and 1 are used).
43 * According to architecture one storage element could have as much as
44 * 1020 subincrements. 255 physmem_ranges are embedded in physmem_info.
45 * If more physmem_ranges are required, a block of memory from already
46 * known physmem_range is taken (online_extended points to it).
47 */
48#define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */
49
50struct physmem_info {
51 u32 range_count;
52 u8 info_source;
53 unsigned long usable;
54 struct reserved_range reserved[RR_MAX];
55 struct physmem_range online[MEM_INLINED_ENTRIES];
56 struct physmem_range *online_extended;
57};
58
59extern struct physmem_info physmem_info;
60
61void add_physmem_online_range(u64 start, u64 end);
62
63static inline int __get_physmem_range(u32 n, unsigned long *start,
64 unsigned long *end, bool respect_usable_limit)
65{
66 if (n >= physmem_info.range_count) {
67 *start = 0;
68 *end = 0;
69 return -1;
70 }
71
72 if (n < MEM_INLINED_ENTRIES) {
73 *start = (unsigned long)physmem_info.online[n].start;
74 *end = (unsigned long)physmem_info.online[n].end;
75 } else {
76 *start = (unsigned long)physmem_info.online_extended[n - MEM_INLINED_ENTRIES].start;
77 *end = (unsigned long)physmem_info.online_extended[n - MEM_INLINED_ENTRIES].end;
78 }
79
80 if (respect_usable_limit && physmem_info.usable) {
81 if (*start >= physmem_info.usable)
82 return -1;
83 if (*end > physmem_info.usable)
84 *end = physmem_info.usable;
85 }
86 return 0;
87}
88
89/**
90 * for_each_physmem_usable_range - early online memory range iterator
91 * @i: an integer used as loop variable
92 * @p_start: ptr to unsigned long for start address of the range
93 * @p_end: ptr to unsigned long for end address of the range
94 *
95 * Walks over detected online memory ranges below usable limit.
96 */
97#define for_each_physmem_usable_range(i, p_start, p_end) \
98 for (i = 0; !__get_physmem_range(i, p_start, p_end, true); i++)
99
100/* Walks over all detected online memory ranges disregarding usable limit. */
101#define for_each_physmem_online_range(i, p_start, p_end) \
102 for (i = 0; !__get_physmem_range(i, p_start, p_end, false); i++)
103
104static inline const char *get_physmem_info_source(void)
105{
106 switch (physmem_info.info_source) {
107 case MEM_DETECT_SCLP_STOR_INFO:
108 return "sclp storage info";
109 case MEM_DETECT_DIAG260:
110 return "diag260";
111 case MEM_DETECT_DIAG500_STOR_LIMIT:
112 return "diag500 storage limit";
113 case MEM_DETECT_SCLP_READ_INFO:
114 return "sclp read info";
115 case MEM_DETECT_BIN_SEARCH:
116 return "binary search";
117 }
118 return "none";
119}
120
121#define RR_TYPE_NAME(t) case RR_ ## t: return #t
122static inline const char *get_rr_type_name(enum reserved_range_type t)
123{
124 switch (t) {
125 RR_TYPE_NAME(DECOMPRESSOR);
126 RR_TYPE_NAME(INITRD);
127 RR_TYPE_NAME(VMLINUX);
128 RR_TYPE_NAME(AMODE31);
129 RR_TYPE_NAME(IPLREPORT);
130 RR_TYPE_NAME(CERT_COMP_LIST);
131 RR_TYPE_NAME(MEM_DETECT_EXT);
132 RR_TYPE_NAME(VMEM);
133 default:
134 return "UNKNOWN";
135 }
136}
137
138#define for_each_physmem_reserved_type_range(t, range, p_start, p_end) \
139 for (range = &physmem_info.reserved[t], *p_start = range->start, *p_end = range->end; \
140 range && range->end; range = range->chain ? __va(range->chain) : NULL, \
141 *p_start = range ? range->start : 0, *p_end = range ? range->end : 0)
142
143static inline struct reserved_range *__physmem_reserved_next(enum reserved_range_type *t,
144 struct reserved_range *range)
145{
146 if (!range) {
147 range = &physmem_info.reserved[*t];
148 if (range->end)
149 return range;
150 }
151 if (range->chain)
152 return __va(range->chain);
153 while (++*t < RR_MAX) {
154 range = &physmem_info.reserved[*t];
155 if (range->end)
156 return range;
157 }
158 return NULL;
159}
160
161#define for_each_physmem_reserved_range(t, range, p_start, p_end) \
162 for (t = 0, range = __physmem_reserved_next(&t, NULL), \
163 *p_start = range ? range->start : 0, *p_end = range ? range->end : 0; \
164 range; range = __physmem_reserved_next(&t, range), \
165 *p_start = range ? range->start : 0, *p_end = range ? range->end : 0)
166
167static inline unsigned long get_physmem_reserved(enum reserved_range_type type,
168 unsigned long *addr, unsigned long *size)
169{
170 *addr = physmem_info.reserved[type].start;
171 *size = physmem_info.reserved[type].end - physmem_info.reserved[type].start;
172 return *size;
173}
174
175#define AMODE31_START (physmem_info.reserved[RR_AMODE31].start)
176#define AMODE31_END (physmem_info.reserved[RR_AMODE31].end)
177
178#endif
179

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source code of linux/arch/s390/include/asm/physmem_info.h