1// SPDX-License-Identifier: GPL-2.0
2#define boot_fmt(fmt) "physmem: " fmt
3#include <linux/processor.h>
4#include <linux/errno.h>
5#include <linux/init.h>
6#include <asm/physmem_info.h>
7#include <asm/stacktrace.h>
8#include <asm/boot_data.h>
9#include <asm/sparsemem.h>
10#include <asm/sections.h>
11#include <asm/setup.h>
12#include <asm/sclp.h>
13#include <asm/asm.h>
14#include <asm/uv.h>
15#include "decompressor.h"
16#include "boot.h"
17
18struct physmem_info __bootdata(physmem_info);
19static unsigned int physmem_alloc_ranges;
20static unsigned long physmem_alloc_pos;
21
22/* up to 256 storage elements, 1020 subincrements each */
23#define ENTRIES_EXTENDED_MAX \
24 (256 * (1020 / 2) * sizeof(struct physmem_range))
25
26static struct physmem_range *__get_physmem_range_ptr(u32 n)
27{
28 if (n < MEM_INLINED_ENTRIES)
29 return &physmem_info.online[n];
30 if (unlikely(!physmem_info.online_extended)) {
31 physmem_info.online_extended = (struct physmem_range *)physmem_alloc_range(
32 RR_MEM_DETECT_EXT, ENTRIES_EXTENDED_MAX, sizeof(long), 0,
33 physmem_alloc_pos, true);
34 }
35 return &physmem_info.online_extended[n - MEM_INLINED_ENTRIES];
36}
37
38/*
39 * sequential calls to add_physmem_online_range with adjacent memory ranges
40 * are merged together into single memory range.
41 */
42void add_physmem_online_range(u64 start, u64 end)
43{
44 struct physmem_range *range;
45
46 if (physmem_info.range_count) {
47 range = __get_physmem_range_ptr(n: physmem_info.range_count - 1);
48 if (range->end == start) {
49 range->end = end;
50 return;
51 }
52 }
53
54 range = __get_physmem_range_ptr(n: physmem_info.range_count);
55 range->start = start;
56 range->end = end;
57 physmem_info.range_count++;
58}
59
60static int __diag260(unsigned long rx1, unsigned long rx2)
61{
62 union register_pair rx;
63 int cc, exception;
64 unsigned long ry;
65
66 rx.even = rx1;
67 rx.odd = rx2;
68 ry = 0x10; /* storage configuration */
69 exception = 1;
70 asm_inline volatile(
71 " diag %[rx],%[ry],0x260\n"
72 "0: lhi %[exc],0\n"
73 "1:\n"
74 CC_IPM(cc)
75 EX_TABLE(0b, 1b)
76 : CC_OUT(cc, cc), [exc] "+d" (exception), [ry] "+d" (ry)
77 : [rx] "d" (rx.pair)
78 : CC_CLOBBER_LIST("memory"));
79 cc = exception ? -1 : CC_TRANSFORM(cc);
80 return cc == 0 ? ry : -1;
81}
82
83static int diag260(void)
84{
85 int rc, i;
86
87 struct {
88 unsigned long start;
89 unsigned long end;
90 } storage_extents[8] __aligned(16); /* VM supports up to 8 extends */
91
92 memset(storage_extents, 0, sizeof(storage_extents));
93 rc = __diag260(rx1: (unsigned long)storage_extents, rx2: sizeof(storage_extents));
94 if (rc == -1)
95 return -1;
96
97 for (i = 0; i < min_t(int, rc, ARRAY_SIZE(storage_extents)); i++)
98 add_physmem_online_range(start: storage_extents[i].start, end: storage_extents[i].end + 1);
99 return 0;
100}
101
102#define DIAG500_SC_STOR_LIMIT 4
103
104static int diag500_storage_limit(unsigned long *max_physmem_end)
105{
106 unsigned long storage_limit;
107
108 asm_inline volatile(
109 " lghi %%r1,%[subcode]\n"
110 " lghi %%r2,0\n"
111 " diag %%r2,%%r4,0x500\n"
112 "0: lgr %[slimit],%%r2\n"
113 EX_TABLE(0b, 0b)
114 : [slimit] "=d" (storage_limit)
115 : [subcode] "i" (DIAG500_SC_STOR_LIMIT)
116 : "memory", "1", "2");
117 if (!storage_limit)
118 return -EINVAL;
119 /* Convert inclusive end to exclusive end */
120 *max_physmem_end = storage_limit + 1;
121 return 0;
122}
123
124static int tprot(unsigned long addr)
125{
126 int cc, exception;
127
128 exception = 1;
129 asm_inline volatile(
130 " tprot 0(%[addr]),0\n"
131 "0: lhi %[exc],0\n"
132 "1:\n"
133 CC_IPM(cc)
134 EX_TABLE(0b, 1b)
135 : CC_OUT(cc, cc), [exc] "+d" (exception)
136 : [addr] "a" (addr)
137 : CC_CLOBBER_LIST("memory"));
138 cc = exception ? -EFAULT : CC_TRANSFORM(cc);
139 return cc;
140}
141
142static unsigned long search_mem_end(void)
143{
144 unsigned long range = 1 << (MAX_PHYSMEM_BITS - 20); /* in 1MB blocks */
145 unsigned long offset = 0;
146 unsigned long pivot;
147
148 while (range > 1) {
149 range >>= 1;
150 pivot = offset + range;
151 if (!tprot(addr: pivot << 20))
152 offset = pivot;
153 }
154 return (offset + 1) << 20;
155}
156
157unsigned long detect_max_physmem_end(void)
158{
159 unsigned long max_physmem_end = 0;
160
161 if (!diag500_storage_limit(max_physmem_end: &max_physmem_end)) {
162 physmem_info.info_source = MEM_DETECT_DIAG500_STOR_LIMIT;
163 } else if (!sclp_early_get_memsize(&max_physmem_end)) {
164 physmem_info.info_source = MEM_DETECT_SCLP_READ_INFO;
165 } else {
166 max_physmem_end = search_mem_end();
167 physmem_info.info_source = MEM_DETECT_BIN_SEARCH;
168 }
169 boot_debug("Max physical memory: 0x%016lx (info source: %s)\n", max_physmem_end,
170 get_physmem_info_source());
171 return max_physmem_end;
172}
173
174void detect_physmem_online_ranges(unsigned long max_physmem_end)
175{
176 unsigned long start, end;
177 int i;
178
179 if (!sclp_early_read_storage_info()) {
180 physmem_info.info_source = MEM_DETECT_SCLP_STOR_INFO;
181 } else if (physmem_info.info_source == MEM_DETECT_DIAG500_STOR_LIMIT) {
182 unsigned long online_end;
183
184 if (!sclp_early_get_memsize(&online_end)) {
185 physmem_info.info_source = MEM_DETECT_SCLP_READ_INFO;
186 add_physmem_online_range(start: 0, end: online_end);
187 }
188 } else if (!diag260()) {
189 physmem_info.info_source = MEM_DETECT_DIAG260;
190 } else if (max_physmem_end) {
191 add_physmem_online_range(start: 0, end: max_physmem_end);
192 }
193 boot_debug("Online memory ranges (info source: %s):\n", get_physmem_info_source());
194 for_each_physmem_online_range(i, &start, &end)
195 boot_debug(" online [%d]: 0x%016lx-0x%016lx\n", i, start, end);
196}
197
198void physmem_set_usable_limit(unsigned long limit)
199{
200 physmem_info.usable = limit;
201 physmem_alloc_pos = limit;
202 boot_debug("Usable memory limit: 0x%016lx\n", limit);
203}
204
205static void die_oom(unsigned long size, unsigned long align, unsigned long min, unsigned long max)
206{
207 unsigned long start, end, total_mem = 0, total_reserved_mem = 0;
208 struct reserved_range *range;
209 enum reserved_range_type t;
210 int i;
211
212 boot_emerg("Linux version %s\n", kernel_version);
213 if (!is_prot_virt_guest() && early_command_line[0])
214 boot_emerg("Kernel command line: %s\n", early_command_line);
215 boot_emerg("Out of memory allocating %lu bytes 0x%lx aligned in range %lx:%lx\n",
216 size, align, min, max);
217 boot_emerg("Reserved memory ranges:\n");
218 for_each_physmem_reserved_range(t, range, &start, &end) {
219 boot_emerg("%016lx %016lx %s\n", start, end, get_rr_type_name(t));
220 total_reserved_mem += end - start;
221 }
222 boot_emerg("Usable online memory ranges (info source: %s [%d]):\n",
223 get_physmem_info_source(), physmem_info.info_source);
224 for_each_physmem_usable_range(i, &start, &end) {
225 boot_emerg("%016lx %016lx\n", start, end);
226 total_mem += end - start;
227 }
228 boot_emerg("Usable online memory total: %lu Reserved: %lu Free: %lu\n",
229 total_mem, total_reserved_mem,
230 total_mem > total_reserved_mem ? total_mem - total_reserved_mem : 0);
231 boot_panic("Oom\n");
232}
233
234static void _physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size)
235{
236 physmem_info.reserved[type].start = addr;
237 physmem_info.reserved[type].end = addr + size;
238}
239
240void physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size)
241{
242 _physmem_reserve(type: type, addr, size);
243 boot_debug("%-14s 0x%016lx-0x%016lx %s\n", "Reserve:", addr, addr + size,
244 get_rr_type_name(type));
245}
246
247void physmem_free(enum reserved_range_type type)
248{
249 boot_debug("%-14s 0x%016lx-0x%016lx %s\n", "Free:", physmem_info.reserved[type].start,
250 physmem_info.reserved[type].end, get_rr_type_name(type));
251 physmem_info.reserved[type].start = 0;
252 physmem_info.reserved[type].end = 0;
253}
254
255static bool __physmem_alloc_intersects(unsigned long addr, unsigned long size,
256 unsigned long *intersection_start)
257{
258 unsigned long res_addr, res_size;
259 int t;
260
261 for (t = 0; t < RR_MAX; t++) {
262 if (!get_physmem_reserved(t, &res_addr, &res_size))
263 continue;
264 if (intersects(addr0: addr, size0: size, addr1: res_addr, size1: res_size)) {
265 *intersection_start = res_addr;
266 return true;
267 }
268 }
269 return ipl_report_certs_intersects(addr, size, intersection_start);
270}
271
272static unsigned long __physmem_alloc_range(unsigned long size, unsigned long align,
273 unsigned long min, unsigned long max,
274 unsigned int from_ranges, unsigned int *ranges_left,
275 bool die_on_oom)
276{
277 unsigned int nranges = from_ranges ?: physmem_info.range_count;
278 unsigned long range_start, range_end;
279 unsigned long intersection_start;
280 unsigned long addr, pos = max;
281
282 align = max(align, 8UL);
283 while (nranges) {
284 __get_physmem_range(nranges - 1, &range_start, &range_end, false);
285 pos = min(range_end, pos);
286
287 if (round_up(min, align) + size > pos)
288 break;
289 addr = round_down(pos - size, align);
290 if (range_start > addr) {
291 nranges--;
292 continue;
293 }
294 if (__physmem_alloc_intersects(addr, size, intersection_start: &intersection_start)) {
295 pos = intersection_start;
296 continue;
297 }
298
299 if (ranges_left)
300 *ranges_left = nranges;
301 return addr;
302 }
303 if (die_on_oom)
304 die_oom(size, align, min, max);
305 return 0;
306}
307
308unsigned long physmem_alloc_range(enum reserved_range_type type, unsigned long size,
309 unsigned long align, unsigned long min, unsigned long max,
310 bool die_on_oom)
311{
312 unsigned long addr;
313
314 max = min(max, physmem_alloc_pos);
315 addr = __physmem_alloc_range(size, align, min, max, from_ranges: 0, NULL, die_on_oom);
316 if (addr)
317 _physmem_reserve(type: type, addr, size);
318 boot_debug("%-14s 0x%016lx-0x%016lx %s\n", "Alloc range:", addr, addr + size,
319 get_rr_type_name(type));
320 return addr;
321}
322
323unsigned long physmem_alloc(enum reserved_range_type type, unsigned long size,
324 unsigned long align, bool die_on_oom)
325{
326 struct reserved_range *range = &physmem_info.reserved[type];
327 struct reserved_range *new_range = NULL;
328 unsigned int ranges_left;
329 unsigned long addr;
330
331 addr = __physmem_alloc_range(size, align, min: 0, max: physmem_alloc_pos, from_ranges: physmem_alloc_ranges,
332 ranges_left: &ranges_left, die_on_oom);
333 if (!addr)
334 return 0;
335 /* if not a consecutive allocation of the same type or first allocation */
336 if (range->start != addr + size) {
337 if (range->end) {
338 addr = __physmem_alloc_range(sizeof(struct reserved_range), 0, 0,
339 physmem_alloc_pos, physmem_alloc_ranges,
340 &ranges_left, true);
341 new_range = (struct reserved_range *)addr;
342 addr = __physmem_alloc_range(size, align, min: 0, max: addr, from_ranges: ranges_left,
343 ranges_left: &ranges_left, die_on_oom);
344 if (!addr)
345 return 0;
346 *new_range = *range;
347 range->chain = new_range;
348 }
349 range->end = addr + size;
350 }
351 if (type != RR_VMEM) {
352 boot_debug("%-14s 0x%016lx-0x%016lx %-20s align 0x%lx split %d\n", "Alloc topdown:",
353 addr, addr + size, get_rr_type_name(type), align, !!new_range);
354 }
355 range->start = addr;
356 physmem_alloc_pos = addr;
357 physmem_alloc_ranges = ranges_left;
358 return addr;
359}
360
361unsigned long physmem_alloc_or_die(enum reserved_range_type type, unsigned long size,
362 unsigned long align)
363{
364 return physmem_alloc(type: type, size, align, die_on_oom: true);
365}
366
367unsigned long get_physmem_alloc_pos(void)
368{
369 return physmem_alloc_pos;
370}
371
372void dump_physmem_reserved(void)
373{
374 struct reserved_range *range;
375 enum reserved_range_type t;
376 unsigned long start, end;
377
378 boot_debug("Reserved memory ranges:\n");
379 for_each_physmem_reserved_range(t, range, &start, &end) {
380 if (end) {
381 boot_debug("%-14s 0x%016lx-0x%016lx @%012lx chain %012lx\n",
382 get_rr_type_name(t), start, end, (unsigned long)range,
383 (unsigned long)range->chain);
384 }
385 }
386}
387

source code of linux/arch/s390/boot/physmem_info.c