Loading...
1/*
2 * ARM64 Specific Low-Level ACPI Boot Support
3 *
4 * Copyright (C) 2013-2014, Linaro Ltd.
5 * Author: Al Stone <al.stone@linaro.org>
6 * Author: Graeme Gregory <graeme.gregory@linaro.org>
7 * Author: Hanjun Guo <hanjun.guo@linaro.org>
8 * Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
9 * Author: Naresh Bhat <naresh.bhat@linaro.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#define pr_fmt(fmt) "ACPI: " fmt
17
18#include <linux/acpi.h>
19#include <linux/bootmem.h>
20#include <linux/cpumask.h>
21#include <linux/init.h>
22#include <linux/irq.h>
23#include <linux/irqdomain.h>
24#include <linux/memblock.h>
25#include <linux/of_fdt.h>
26#include <linux/smp.h>
27
28#include <asm/cputype.h>
29#include <asm/cpu_ops.h>
30#include <asm/smp_plat.h>
31
32#ifdef CONFIG_ACPI_APEI
33# include <linux/efi.h>
34# include <asm/pgtable.h>
35#endif
36
37int acpi_noirq = 1; /* skip ACPI IRQ initialization */
38int acpi_disabled = 1;
39EXPORT_SYMBOL(acpi_disabled);
40
41int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
42EXPORT_SYMBOL(acpi_pci_disabled);
43
44static bool param_acpi_off __initdata;
45static bool param_acpi_force __initdata;
46
47static int __init parse_acpi(char *arg)
48{
49 if (!arg)
50 return -EINVAL;
51
52 /* "acpi=off" disables both ACPI table parsing and interpreter */
53 if (strcmp(arg, "off") == 0)
54 param_acpi_off = true;
55 else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
56 param_acpi_force = true;
57 else
58 return -EINVAL; /* Core will print when we return error */
59
60 return 0;
61}
62early_param("acpi", parse_acpi);
63
64static int __init dt_scan_depth1_nodes(unsigned long node,
65 const char *uname, int depth,
66 void *data)
67{
68 /*
69 * Return 1 as soon as we encounter a node at depth 1 that is
70 * not the /chosen node.
71 */
72 if (depth == 1 && (strcmp(uname, "chosen") != 0))
73 return 1;
74 return 0;
75}
76
77/*
78 * __acpi_map_table() will be called before page_init(), so early_ioremap()
79 * or early_memremap() should be called here to for ACPI table mapping.
80 */
81char *__init __acpi_map_table(unsigned long phys, unsigned long size)
82{
83 if (!size)
84 return NULL;
85
86 return early_memremap(phys, size);
87}
88
89void __init __acpi_unmap_table(char *map, unsigned long size)
90{
91 if (!map || !size)
92 return;
93
94 early_memunmap(map, size);
95}
96
97bool __init acpi_psci_present(void)
98{
99 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
100}
101
102/* Whether HVC must be used instead of SMC as the PSCI conduit */
103bool __init acpi_psci_use_hvc(void)
104{
105 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
106}
107
108/*
109 * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
110 * checks on it
111 *
112 * Return 0 on success, <0 on failure
113 */
114static int __init acpi_fadt_sanity_check(void)
115{
116 struct acpi_table_header *table;
117 struct acpi_table_fadt *fadt;
118 acpi_status status;
119 acpi_size tbl_size;
120 int ret = 0;
121
122 /*
123 * FADT is required on arm64; retrieve it to check its presence
124 * and carry out revision and ACPI HW reduced compliancy tests
125 */
126 status = acpi_get_table_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
127 if (ACPI_FAILURE(status)) {
128 const char *msg = acpi_format_exception(status);
129
130 pr_err("Failed to get FADT table, %s\n", msg);
131 return -ENODEV;
132 }
133
134 fadt = (struct acpi_table_fadt *)table;
135
136 /*
137 * Revision in table header is the FADT Major revision, and there
138 * is a minor revision of FADT which was introduced by ACPI 5.1,
139 * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
140 * boot protocol configuration data.
141 */
142 if (table->revision < 5 ||
143 (table->revision == 5 && fadt->minor_revision < 1)) {
144 pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n",
145 table->revision, fadt->minor_revision);
146 ret = -EINVAL;
147 goto out;
148 }
149
150 if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
151 pr_err("FADT not ACPI hardware reduced compliant\n");
152 ret = -EINVAL;
153 }
154
155out:
156 /*
157 * acpi_get_table_with_size() creates FADT table mapping that
158 * should be released after parsing and before resuming boot
159 */
160 early_acpi_os_unmap_memory(table, tbl_size);
161 return ret;
162}
163
164/*
165 * acpi_boot_table_init() called from setup_arch(), always.
166 * 1. find RSDP and get its address, and then find XSDT
167 * 2. extract all tables and checksums them all
168 * 3. check ACPI FADT revision
169 * 4. check ACPI FADT HW reduced flag
170 *
171 * We can parse ACPI boot-time tables such as MADT after
172 * this function is called.
173 *
174 * On return ACPI is enabled if either:
175 *
176 * - ACPI tables are initialized and sanity checks passed
177 * - acpi=force was passed in the command line and ACPI was not disabled
178 * explicitly through acpi=off command line parameter
179 *
180 * ACPI is disabled on function return otherwise
181 */
182void __init acpi_boot_table_init(void)
183{
184 /*
185 * Enable ACPI instead of device tree unless
186 * - ACPI has been disabled explicitly (acpi=off), or
187 * - the device tree is not empty (it has more than just a /chosen node)
188 * and ACPI has not been force enabled (acpi=force)
189 */
190 if (param_acpi_off ||
191 (!param_acpi_force && of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
192 return;
193
194 /*
195 * ACPI is disabled at this point. Enable it in order to parse
196 * the ACPI tables and carry out sanity checks
197 */
198 enable_acpi();
199
200 /*
201 * If ACPI tables are initialized and FADT sanity checks passed,
202 * leave ACPI enabled and carry on booting; otherwise disable ACPI
203 * on initialization error.
204 * If acpi=force was passed on the command line it forces ACPI
205 * to be enabled even if its initialization failed.
206 */
207 if (acpi_table_init() || acpi_fadt_sanity_check()) {
208 pr_err("Failed to init ACPI tables\n");
209 if (!param_acpi_force)
210 disable_acpi();
211 }
212}
213
214#ifdef CONFIG_ACPI_APEI
215pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
216{
217 /*
218 * According to "Table 8 Map: EFI memory types to AArch64 memory
219 * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
220 * mapped to a corresponding MAIR attribute encoding.
221 * The EFI memory attribute advises all possible capabilities
222 * of a memory region. We use the most efficient capability.
223 */
224
225 u64 attr;
226
227 attr = efi_mem_attributes(addr);
228 if (attr & EFI_MEMORY_WB)
229 return PAGE_KERNEL;
230 if (attr & EFI_MEMORY_WT)
231 return __pgprot(PROT_NORMAL_WT);
232 if (attr & EFI_MEMORY_WC)
233 return __pgprot(PROT_NORMAL_NC);
234 return __pgprot(PROT_DEVICE_nGnRnE);
235}
236#endif
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ARM64 Specific Low-Level ACPI Boot Support
4 *
5 * Copyright (C) 2013-2014, Linaro Ltd.
6 * Author: Al Stone <al.stone@linaro.org>
7 * Author: Graeme Gregory <graeme.gregory@linaro.org>
8 * Author: Hanjun Guo <hanjun.guo@linaro.org>
9 * Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
10 * Author: Naresh Bhat <naresh.bhat@linaro.org>
11 */
12
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/memblock.h>
23#include <linux/of_fdt.h>
24#include <linux/smp.h>
25#include <linux/serial_core.h>
26
27#include <acpi/ghes.h>
28#include <asm/cputype.h>
29#include <asm/cpu_ops.h>
30#include <asm/daifflags.h>
31#include <asm/pgtable.h>
32#include <asm/smp_plat.h>
33
34int acpi_noirq = 1; /* skip ACPI IRQ initialization */
35int acpi_disabled = 1;
36EXPORT_SYMBOL(acpi_disabled);
37
38int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
39EXPORT_SYMBOL(acpi_pci_disabled);
40
41static bool param_acpi_off __initdata;
42static bool param_acpi_on __initdata;
43static bool param_acpi_force __initdata;
44
45static int __init parse_acpi(char *arg)
46{
47 if (!arg)
48 return -EINVAL;
49
50 /* "acpi=off" disables both ACPI table parsing and interpreter */
51 if (strcmp(arg, "off") == 0)
52 param_acpi_off = true;
53 else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
54 param_acpi_on = true;
55 else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
56 param_acpi_force = true;
57 else
58 return -EINVAL; /* Core will print when we return error */
59
60 return 0;
61}
62early_param("acpi", parse_acpi);
63
64static int __init dt_scan_depth1_nodes(unsigned long node,
65 const char *uname, int depth,
66 void *data)
67{
68 /*
69 * Ignore anything not directly under the root node; we'll
70 * catch its parent instead.
71 */
72 if (depth != 1)
73 return 0;
74
75 if (strcmp(uname, "chosen") == 0)
76 return 0;
77
78 if (strcmp(uname, "hypervisor") == 0 &&
79 of_flat_dt_is_compatible(node, "xen,xen"))
80 return 0;
81
82 /*
83 * This node at depth 1 is neither a chosen node nor a xen node,
84 * which we do not expect.
85 */
86 return 1;
87}
88
89/*
90 * __acpi_map_table() will be called before page_init(), so early_ioremap()
91 * or early_memremap() should be called here to for ACPI table mapping.
92 */
93void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
94{
95 if (!size)
96 return NULL;
97
98 return early_memremap(phys, size);
99}
100
101void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
102{
103 if (!map || !size)
104 return;
105
106 early_memunmap(map, size);
107}
108
109bool __init acpi_psci_present(void)
110{
111 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
112}
113
114/* Whether HVC must be used instead of SMC as the PSCI conduit */
115bool acpi_psci_use_hvc(void)
116{
117 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
118}
119
120/*
121 * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
122 * checks on it
123 *
124 * Return 0 on success, <0 on failure
125 */
126static int __init acpi_fadt_sanity_check(void)
127{
128 struct acpi_table_header *table;
129 struct acpi_table_fadt *fadt;
130 acpi_status status;
131 int ret = 0;
132
133 /*
134 * FADT is required on arm64; retrieve it to check its presence
135 * and carry out revision and ACPI HW reduced compliancy tests
136 */
137 status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
138 if (ACPI_FAILURE(status)) {
139 const char *msg = acpi_format_exception(status);
140
141 pr_err("Failed to get FADT table, %s\n", msg);
142 return -ENODEV;
143 }
144
145 fadt = (struct acpi_table_fadt *)table;
146
147 /*
148 * Revision in table header is the FADT Major revision, and there
149 * is a minor revision of FADT which was introduced by ACPI 5.1,
150 * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
151 * boot protocol configuration data.
152 */
153 if (table->revision < 5 ||
154 (table->revision == 5 && fadt->minor_revision < 1)) {
155 pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 5.1+\n",
156 table->revision, fadt->minor_revision);
157
158 if (!fadt->arm_boot_flags) {
159 ret = -EINVAL;
160 goto out;
161 }
162 pr_err("FADT has ARM boot flags set, assuming 5.1\n");
163 }
164
165 if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
166 pr_err("FADT not ACPI hardware reduced compliant\n");
167 ret = -EINVAL;
168 }
169
170out:
171 /*
172 * acpi_get_table() creates FADT table mapping that
173 * should be released after parsing and before resuming boot
174 */
175 acpi_put_table(table);
176 return ret;
177}
178
179/*
180 * acpi_boot_table_init() called from setup_arch(), always.
181 * 1. find RSDP and get its address, and then find XSDT
182 * 2. extract all tables and checksums them all
183 * 3. check ACPI FADT revision
184 * 4. check ACPI FADT HW reduced flag
185 *
186 * We can parse ACPI boot-time tables such as MADT after
187 * this function is called.
188 *
189 * On return ACPI is enabled if either:
190 *
191 * - ACPI tables are initialized and sanity checks passed
192 * - acpi=force was passed in the command line and ACPI was not disabled
193 * explicitly through acpi=off command line parameter
194 *
195 * ACPI is disabled on function return otherwise
196 */
197void __init acpi_boot_table_init(void)
198{
199 /*
200 * Enable ACPI instead of device tree unless
201 * - ACPI has been disabled explicitly (acpi=off), or
202 * - the device tree is not empty (it has more than just a /chosen node,
203 * and a /hypervisor node when running on Xen)
204 * and ACPI has not been [force] enabled (acpi=on|force)
205 */
206 if (param_acpi_off ||
207 (!param_acpi_on && !param_acpi_force &&
208 of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
209 goto done;
210
211 /*
212 * ACPI is disabled at this point. Enable it in order to parse
213 * the ACPI tables and carry out sanity checks
214 */
215 enable_acpi();
216
217 /*
218 * If ACPI tables are initialized and FADT sanity checks passed,
219 * leave ACPI enabled and carry on booting; otherwise disable ACPI
220 * on initialization error.
221 * If acpi=force was passed on the command line it forces ACPI
222 * to be enabled even if its initialization failed.
223 */
224 if (acpi_table_init() || acpi_fadt_sanity_check()) {
225 pr_err("Failed to init ACPI tables\n");
226 if (!param_acpi_force)
227 disable_acpi();
228 }
229
230done:
231 if (acpi_disabled) {
232 if (earlycon_acpi_spcr_enable)
233 early_init_dt_scan_chosen_stdout();
234 } else {
235 acpi_parse_spcr(earlycon_acpi_spcr_enable, true);
236 if (IS_ENABLED(CONFIG_ACPI_BGRT))
237 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
238 }
239}
240
241pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
242{
243 /*
244 * According to "Table 8 Map: EFI memory types to AArch64 memory
245 * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
246 * mapped to a corresponding MAIR attribute encoding.
247 * The EFI memory attribute advises all possible capabilities
248 * of a memory region. We use the most efficient capability.
249 */
250
251 u64 attr;
252
253 attr = efi_mem_attributes(addr);
254 if (attr & EFI_MEMORY_WB)
255 return PAGE_KERNEL;
256 if (attr & EFI_MEMORY_WT)
257 return __pgprot(PROT_NORMAL_WT);
258 if (attr & EFI_MEMORY_WC)
259 return __pgprot(PROT_NORMAL_NC);
260 return __pgprot(PROT_DEVICE_nGnRnE);
261}
262
263/*
264 * Claim Synchronous External Aborts as a firmware first notification.
265 *
266 * Used by KVM and the arch do_sea handler.
267 * @regs may be NULL when called from process context.
268 */
269int apei_claim_sea(struct pt_regs *regs)
270{
271 int err = -ENOENT;
272 unsigned long current_flags;
273
274 if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
275 return err;
276
277 current_flags = arch_local_save_flags();
278
279 /*
280 * SEA can interrupt SError, mask it and describe this as an NMI so
281 * that APEI defers the handling.
282 */
283 local_daif_restore(DAIF_ERRCTX);
284 nmi_enter();
285 err = ghes_notify_sea();
286 nmi_exit();
287 local_daif_restore(current_flags);
288
289 return err;
290}