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13#define pr_fmt(fmt) "ACPI: " fmt
14
15#include <linux/acpi.h>
16#include <linux/cpumask.h>
17#include <linux/efi.h>
18#include <linux/efi-bgrt.h>
19#include <linux/init.h>
20#include <linux/irq.h>
21#include <linux/irqdomain.h>
22#include <linux/irq_work.h>
23#include <linux/memblock.h>
24#include <linux/of_fdt.h>
25#include <linux/smp.h>
26#include <linux/serial_core.h>
27#include <linux/pgtable.h>
28
29#include <acpi/ghes.h>
30#include <asm/cputype.h>
31#include <asm/cpu_ops.h>
32#include <asm/daifflags.h>
33#include <asm/smp_plat.h>
34
35int acpi_noirq = 1;
36int acpi_disabled = 1;
37EXPORT_SYMBOL(acpi_disabled);
38
39int acpi_pci_disabled = 1;
40EXPORT_SYMBOL(acpi_pci_disabled);
41
42static bool param_acpi_off __initdata;
43static bool param_acpi_on __initdata;
44static bool param_acpi_force __initdata;
45
46static int __init parse_acpi(char *arg)
47{
48 if (!arg)
49 return -EINVAL;
50
51
52 if (strcmp(arg, "off") == 0)
53 param_acpi_off = true;
54 else if (strcmp(arg, "on") == 0)
55 param_acpi_on = true;
56 else if (strcmp(arg, "force") == 0)
57 param_acpi_force = true;
58 else
59 return -EINVAL;
60
61 return 0;
62}
63early_param("acpi", parse_acpi);
64
65static int __init dt_scan_depth1_nodes(unsigned long node,
66 const char *uname, int depth,
67 void *data)
68{
69
70
71
72
73 if (depth != 1)
74 return 0;
75
76 if (strcmp(uname, "chosen") == 0)
77 return 0;
78
79 if (strcmp(uname, "hypervisor") == 0 &&
80 of_flat_dt_is_compatible(node, "xen,xen"))
81 return 0;
82
83
84
85
86
87 return 1;
88}
89
90
91
92
93
94void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
95{
96 if (!size)
97 return NULL;
98
99 return early_memremap(phys, size);
100}
101
102void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
103{
104 if (!map || !size)
105 return;
106
107 early_memunmap(map, size);
108}
109
110bool __init acpi_psci_present(void)
111{
112 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
113}
114
115
116bool acpi_psci_use_hvc(void)
117{
118 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
119}
120
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125
126
127static int __init acpi_fadt_sanity_check(void)
128{
129 struct acpi_table_header *table;
130 struct acpi_table_fadt *fadt;
131 acpi_status status;
132 int ret = 0;
133
134
135
136
137
138 status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
139 if (ACPI_FAILURE(status)) {
140 const char *msg = acpi_format_exception(status);
141
142 pr_err("Failed to get FADT table, %s\n", msg);
143 return -ENODEV;
144 }
145
146 fadt = (struct acpi_table_fadt *)table;
147
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153
154 if (table->revision < 5 ||
155 (table->revision == 5 && fadt->minor_revision < 1)) {
156 pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 5.1+\n",
157 table->revision, fadt->minor_revision);
158
159 if (!fadt->arm_boot_flags) {
160 ret = -EINVAL;
161 goto out;
162 }
163 pr_err("FADT has ARM boot flags set, assuming 5.1\n");
164 }
165
166 if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
167 pr_err("FADT not ACPI hardware reduced compliant\n");
168 ret = -EINVAL;
169 }
170
171out:
172
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175
176 acpi_put_table(table);
177 return ret;
178}
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197
198void __init acpi_boot_table_init(void)
199{
200
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205
206
207 if (param_acpi_off ||
208 (!param_acpi_on && !param_acpi_force &&
209 of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
210 goto done;
211
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214
215
216 enable_acpi();
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224
225 if (acpi_table_init() || acpi_fadt_sanity_check()) {
226 pr_err("Failed to init ACPI tables\n");
227 if (!param_acpi_force)
228 disable_acpi();
229 }
230
231done:
232 if (acpi_disabled) {
233 if (earlycon_acpi_spcr_enable)
234 early_init_dt_scan_chosen_stdout();
235 } else {
236 acpi_parse_spcr(earlycon_acpi_spcr_enable, true);
237 if (IS_ENABLED(CONFIG_ACPI_BGRT))
238 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
239 }
240}
241
242static pgprot_t __acpi_get_writethrough_mem_attribute(void)
243{
244
245
246
247
248
249
250 pr_warn_once("No MAIR allocation for EFI_MEMORY_WT; treating as Normal Non-cacheable\n");
251 return __pgprot(PROT_NORMAL_NC);
252}
253
254pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
255{
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264 u64 attr;
265
266 attr = efi_mem_attributes(addr);
267 if (attr & EFI_MEMORY_WB)
268 return PAGE_KERNEL;
269 if (attr & EFI_MEMORY_WC)
270 return __pgprot(PROT_NORMAL_NC);
271 if (attr & EFI_MEMORY_WT)
272 return __acpi_get_writethrough_mem_attribute();
273 return __pgprot(PROT_DEVICE_nGnRnE);
274}
275
276void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
277{
278 efi_memory_desc_t *md, *region = NULL;
279 pgprot_t prot;
280
281 if (WARN_ON_ONCE(!efi_enabled(EFI_MEMMAP)))
282 return NULL;
283
284 for_each_efi_memory_desc(md) {
285 u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
286
287 if (phys < md->phys_addr || phys >= end)
288 continue;
289
290 if (phys + size > end) {
291 pr_warn(FW_BUG "requested region covers multiple EFI memory regions\n");
292 return NULL;
293 }
294 region = md;
295 break;
296 }
297
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304 prot = __pgprot(PROT_DEVICE_nGnRnE);
305 if (region) {
306 switch (region->type) {
307 case EFI_LOADER_CODE:
308 case EFI_LOADER_DATA:
309 case EFI_BOOT_SERVICES_CODE:
310 case EFI_BOOT_SERVICES_DATA:
311 case EFI_CONVENTIONAL_MEMORY:
312 case EFI_PERSISTENT_MEMORY:
313 if (memblock_is_map_memory(phys) ||
314 !memblock_is_region_memory(phys, size)) {
315 pr_warn(FW_BUG "requested region covers kernel memory @ %pa\n", &phys);
316 return NULL;
317 }
318
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326
327 fallthrough;
328
329 case EFI_RUNTIME_SERVICES_CODE:
330
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335 prot = PAGE_KERNEL_RO;
336 break;
337
338 case EFI_ACPI_RECLAIM_MEMORY:
339
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348 if (memblock_is_map_memory(phys))
349 return (void __iomem *)__phys_to_virt(phys);
350 fallthrough;
351
352 default:
353 if (region->attribute & EFI_MEMORY_WB)
354 prot = PAGE_KERNEL;
355 else if (region->attribute & EFI_MEMORY_WC)
356 prot = __pgprot(PROT_NORMAL_NC);
357 else if (region->attribute & EFI_MEMORY_WT)
358 prot = __acpi_get_writethrough_mem_attribute();
359 }
360 }
361 return __ioremap(phys, size, prot);
362}
363
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369
370int apei_claim_sea(struct pt_regs *regs)
371{
372 int err = -ENOENT;
373 bool return_to_irqs_enabled;
374 unsigned long current_flags;
375
376 if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
377 return err;
378
379 current_flags = local_daif_save_flags();
380
381
382 return_to_irqs_enabled = !irqs_disabled_flags(arch_local_save_flags());
383
384 if (regs)
385 return_to_irqs_enabled = interrupts_enabled(regs);
386
387
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389
390
391 local_daif_restore(DAIF_ERRCTX);
392 nmi_enter();
393 err = ghes_notify_sea();
394 nmi_exit();
395
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397
398
399
400 if (!err) {
401 if (return_to_irqs_enabled) {
402 local_daif_restore(DAIF_PROCCTX_NOIRQ);
403 __irq_enter();
404 irq_work_run();
405 __irq_exit();
406 } else {
407 pr_warn_ratelimited("APEI work queued but not completed");
408 err = -EINPROGRESS;
409 }
410 }
411
412 local_daif_restore(current_flags);
413
414 return err;
415}
416
417void arch_reserve_mem_area(acpi_physical_address addr, size_t size)
418{
419 memblock_mark_nomap(addr, size);
420}
421