1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * acpi.c - Architecture-Specific Low-Level ACPI Boot Support
4 *
5 * Author: Jianmin Lv <lvjianmin@loongson.cn>
6 * Huacai Chen <chenhuacai@loongson.cn>
7 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
8 */
9
10 #include <linux/init.h>
11 #include <linux/acpi.h>
12 #include <linux/efi-bgrt.h>
13 #include <linux/irq.h>
14 #include <linux/irqdomain.h>
15 #include <linux/memblock.h>
16 #include <linux/of_fdt.h>
17 #include <linux/serial_core.h>
18 #include <asm/io.h>
19 #include <asm/numa.h>
20 #include <asm/loongson.h>
21
22 int acpi_disabled;
23 EXPORT_SYMBOL(acpi_disabled);
24 int acpi_noirq;
25 int acpi_pci_disabled;
26 EXPORT_SYMBOL(acpi_pci_disabled);
27 int acpi_strict = 1; /* We have no workarounds on LoongArch */
28 int num_processors;
29 int disabled_cpus;
30
31 u64 acpi_saved_sp;
32
33 #define PREFIX "ACPI: "
34
35 struct acpi_madt_core_pic acpi_core_pic[MAX_CORE_PIC];
36
__acpi_map_table(unsigned long phys,unsigned long size)37 void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size)
38 {
39
40 if (!phys || !size)
41 return NULL;
42
43 return early_memremap(phys, size);
44 }
__acpi_unmap_table(void __iomem * map,unsigned long size)45 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
46 {
47 if (!map || !size)
48 return;
49
50 early_memunmap(map, size);
51 }
52
acpi_os_ioremap(acpi_physical_address phys,acpi_size size)53 void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
54 {
55 if (!memblock_is_memory(phys))
56 return ioremap(phys, size);
57 else
58 return ioremap_cache(phys, size);
59 }
60
61 #ifdef CONFIG_SMP
set_processor_mask(u32 id,u32 pass)62 static int set_processor_mask(u32 id, u32 pass)
63 {
64 int cpu = -1, cpuid = id;
65
66 if (num_processors >= NR_CPUS) {
67 pr_warn(PREFIX "nr_cpus limit of %i reached."
68 " processor 0x%x ignored.\n", NR_CPUS, cpuid);
69
70 return -ENODEV;
71
72 }
73
74 if (cpuid == loongson_sysconf.boot_cpu_id)
75 cpu = 0;
76
77 switch (pass) {
78 case 1: /* Pass 1 handle enabled processors */
79 if (cpu < 0)
80 cpu = find_first_zero_bit(cpumask_bits(cpu_present_mask), NR_CPUS);
81 num_processors++;
82 set_cpu_present(cpu, true);
83 break;
84 case 2: /* Pass 2 handle disabled processors */
85 if (cpu < 0)
86 cpu = find_first_zero_bit(cpumask_bits(cpu_possible_mask), NR_CPUS);
87 disabled_cpus++;
88 break;
89 default:
90 return cpu;
91 }
92
93 set_cpu_possible(cpu, true);
94 __cpu_number_map[cpuid] = cpu;
95 __cpu_logical_map[cpu] = cpuid;
96
97 return cpu;
98 }
99 #endif
100
101 static int __init
acpi_parse_p1_processor(union acpi_subtable_headers * header,const unsigned long end)102 acpi_parse_p1_processor(union acpi_subtable_headers *header, const unsigned long end)
103 {
104 struct acpi_madt_core_pic *processor = NULL;
105
106 processor = (struct acpi_madt_core_pic *)header;
107 if (BAD_MADT_ENTRY(processor, end))
108 return -EINVAL;
109
110 acpi_table_print_madt_entry(&header->common);
111 #ifdef CONFIG_SMP
112 acpi_core_pic[processor->core_id] = *processor;
113 if (processor->flags & ACPI_MADT_ENABLED)
114 set_processor_mask(processor->core_id, 1);
115 #endif
116
117 return 0;
118 }
119
120 static int __init
acpi_parse_p2_processor(union acpi_subtable_headers * header,const unsigned long end)121 acpi_parse_p2_processor(union acpi_subtable_headers *header, const unsigned long end)
122 {
123 struct acpi_madt_core_pic *processor = NULL;
124
125 processor = (struct acpi_madt_core_pic *)header;
126 if (BAD_MADT_ENTRY(processor, end))
127 return -EINVAL;
128
129 #ifdef CONFIG_SMP
130 if (!(processor->flags & ACPI_MADT_ENABLED))
131 set_processor_mask(processor->core_id, 2);
132 #endif
133
134 return 0;
135 }
136 static int __init
acpi_parse_eio_master(union acpi_subtable_headers * header,const unsigned long end)137 acpi_parse_eio_master(union acpi_subtable_headers *header, const unsigned long end)
138 {
139 static int core = 0;
140 struct acpi_madt_eio_pic *eiointc = NULL;
141
142 eiointc = (struct acpi_madt_eio_pic *)header;
143 if (BAD_MADT_ENTRY(eiointc, end))
144 return -EINVAL;
145
146 core = eiointc->node * CORES_PER_EIO_NODE;
147 set_bit(core, loongson_sysconf.cores_io_master);
148
149 return 0;
150 }
151
acpi_process_madt(void)152 static void __init acpi_process_madt(void)
153 {
154 #ifdef CONFIG_SMP
155 int i;
156
157 for (i = 0; i < NR_CPUS; i++) {
158 __cpu_number_map[i] = -1;
159 __cpu_logical_map[i] = -1;
160 }
161 #endif
162 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC,
163 acpi_parse_p1_processor, MAX_CORE_PIC);
164
165 acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC,
166 acpi_parse_p2_processor, MAX_CORE_PIC);
167
168 acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC,
169 acpi_parse_eio_master, MAX_IO_PICS);
170
171 loongson_sysconf.nr_cpus = num_processors;
172 }
173
174 int pptt_enabled;
175
parse_acpi_topology(void)176 int __init parse_acpi_topology(void)
177 {
178 int cpu, topology_id;
179
180 for_each_possible_cpu(cpu) {
181 topology_id = find_acpi_cpu_topology(cpu, 0);
182 if (topology_id < 0) {
183 pr_warn("Invalid BIOS PPTT\n");
184 return -ENOENT;
185 }
186
187 if (acpi_pptt_cpu_is_thread(cpu) <= 0)
188 cpu_data[cpu].core = topology_id;
189 else {
190 topology_id = find_acpi_cpu_topology(cpu, 1);
191 if (topology_id < 0)
192 return -ENOENT;
193
194 cpu_data[cpu].core = topology_id;
195 }
196 }
197
198 pptt_enabled = 1;
199
200 return 0;
201 }
202
203 #ifndef CONFIG_SUSPEND
204 int (*acpi_suspend_lowlevel)(void);
205 #else
206 int (*acpi_suspend_lowlevel)(void) = loongarch_acpi_suspend;
207 #endif
208
acpi_boot_table_init(void)209 void __init acpi_boot_table_init(void)
210 {
211 /*
212 * If acpi_disabled, bail out
213 */
214 if (acpi_disabled)
215 goto fdt_earlycon;
216
217 /*
218 * Initialize the ACPI boot-time table parser.
219 */
220 if (acpi_table_init()) {
221 disable_acpi();
222 goto fdt_earlycon;
223 }
224
225 loongson_sysconf.boot_cpu_id = read_csr_cpuid();
226
227 /*
228 * Process the Multiple APIC Description Table (MADT), if present
229 */
230 acpi_process_madt();
231
232 /* Do not enable ACPI SPCR console by default */
233 acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
234
235 if (IS_ENABLED(CONFIG_ACPI_BGRT))
236 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
237
238 return;
239
240 fdt_earlycon:
241 if (earlycon_acpi_spcr_enable)
242 early_init_dt_scan_chosen_stdout();
243 }
244
245 #ifdef CONFIG_ACPI_NUMA
246
setup_node(int pxm)247 static __init int setup_node(int pxm)
248 {
249 return acpi_map_pxm_to_node(pxm);
250 }
251
252 /*
253 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
254 * I/O localities since SRAT does not list them. I/O localities are
255 * not supported at this point.
256 */
257 unsigned int numa_distance_cnt;
258
get_numa_distances_cnt(struct acpi_table_slit * slit)259 static inline unsigned int get_numa_distances_cnt(struct acpi_table_slit *slit)
260 {
261 return slit->locality_count;
262 }
263
numa_set_distance(int from,int to,int distance)264 void __init numa_set_distance(int from, int to, int distance)
265 {
266 if ((u8)distance != distance || (from == to && distance != LOCAL_DISTANCE)) {
267 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
268 from, to, distance);
269 return;
270 }
271
272 node_distances[from][to] = distance;
273 }
274
275 /* Callback for Proximity Domain -> CPUID mapping */
276 void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity * pa)277 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
278 {
279 int pxm, node;
280
281 if (srat_disabled())
282 return;
283 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
284 bad_srat();
285 return;
286 }
287 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
288 return;
289 pxm = pa->proximity_domain_lo;
290 if (acpi_srat_revision >= 2) {
291 pxm |= (pa->proximity_domain_hi[0] << 8);
292 pxm |= (pa->proximity_domain_hi[1] << 16);
293 pxm |= (pa->proximity_domain_hi[2] << 24);
294 }
295 node = setup_node(pxm);
296 if (node < 0) {
297 pr_err("SRAT: Too many proximity domains %x\n", pxm);
298 bad_srat();
299 return;
300 }
301
302 if (pa->apic_id >= CONFIG_NR_CPUS) {
303 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u skipped apicid that is too big\n",
304 pxm, pa->apic_id, node);
305 return;
306 }
307
308 early_numa_add_cpu(pa->apic_id, node);
309
310 set_cpuid_to_node(pa->apic_id, node);
311 node_set(node, numa_nodes_parsed);
312 pr_info("SRAT: PXM %u -> CPU 0x%02x -> Node %u\n", pxm, pa->apic_id, node);
313 }
314
315 #endif
316
arch_reserve_mem_area(acpi_physical_address addr,size_t size)317 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
318 {
319 memblock_reserve(addr, size);
320 }
321
322 #ifdef CONFIG_ACPI_HOTPLUG_CPU
323
324 #include <acpi/processor.h>
325
acpi_map_cpu2node(acpi_handle handle,int cpu,int physid)326 static int __ref acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
327 {
328 #ifdef CONFIG_ACPI_NUMA
329 int nid;
330
331 nid = acpi_get_node(handle);
332
333 if (nid != NUMA_NO_NODE)
334 nid = early_cpu_to_node(cpu);
335
336 if (nid != NUMA_NO_NODE) {
337 set_cpuid_to_node(physid, nid);
338 node_set(nid, numa_nodes_parsed);
339 set_cpu_numa_node(cpu, nid);
340 cpumask_set_cpu(cpu, cpumask_of_node(nid));
341 }
342 #endif
343 return 0;
344 }
345
acpi_map_cpu(acpi_handle handle,phys_cpuid_t physid,u32 acpi_id,int * pcpu)346 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu)
347 {
348 int cpu;
349
350 cpu = cpu_number_map(physid);
351 if (cpu < 0 || cpu >= nr_cpu_ids) {
352 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
353 return -ERANGE;
354 }
355
356 num_processors++;
357 set_cpu_present(cpu, true);
358 acpi_map_cpu2node(handle, cpu, physid);
359
360 *pcpu = cpu;
361
362 return 0;
363 }
364 EXPORT_SYMBOL(acpi_map_cpu);
365
acpi_unmap_cpu(int cpu)366 int acpi_unmap_cpu(int cpu)
367 {
368 #ifdef CONFIG_ACPI_NUMA
369 set_cpuid_to_node(cpu_logical_map(cpu), NUMA_NO_NODE);
370 #endif
371 set_cpu_present(cpu, false);
372 num_processors--;
373
374 pr_info("cpu%d hot remove!\n", cpu);
375
376 return 0;
377 }
378 EXPORT_SYMBOL(acpi_unmap_cpu);
379
380 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
381