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