2 * ARM64 Specific Low-Level ACPI Boot Support
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>
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.
16 #define pr_fmt(fmt) "ACPI: " fmt
18 #include <linux/acpi.h>
19 #include <linux/cpumask.h>
20 #include <linux/efi.h>
21 #include <linux/efi-bgrt.h>
22 #include <linux/init.h>
23 #include <linux/irq.h>
24 #include <linux/irqdomain.h>
25 #include <linux/memblock.h>
26 #include <linux/of_fdt.h>
27 #include <linux/smp.h>
28 #include <linux/serial_core.h>
30 #include <acpi/ghes.h>
31 #include <asm/cputype.h>
32 #include <asm/cpu_ops.h>
33 #include <asm/daifflags.h>
34 #include <asm/pgtable.h>
35 #include <asm/smp_plat.h>
37 int acpi_noirq = 1; /* skip ACPI IRQ initialization */
38 int acpi_disabled = 1;
39 EXPORT_SYMBOL(acpi_disabled);
41 int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
42 EXPORT_SYMBOL(acpi_pci_disabled);
44 static bool param_acpi_off __initdata;
45 static bool param_acpi_on __initdata;
46 static bool param_acpi_force __initdata;
48 static int __init parse_acpi(char *arg)
53 /* "acpi=off" disables both ACPI table parsing and interpreter */
54 if (strcmp(arg, "off") == 0)
55 param_acpi_off = true;
56 else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
58 else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
59 param_acpi_force = true;
61 return -EINVAL; /* Core will print when we return error */
65 early_param("acpi", parse_acpi);
67 static int __init dt_scan_depth1_nodes(unsigned long node,
68 const char *uname, int depth,
72 * Ignore anything not directly under the root node; we'll
73 * catch its parent instead.
78 if (strcmp(uname, "chosen") == 0)
81 if (strcmp(uname, "hypervisor") == 0 &&
82 of_flat_dt_is_compatible(node, "xen,xen"))
86 * This node at depth 1 is neither a chosen node nor a xen node,
87 * which we do not expect.
93 * __acpi_map_table() will be called before page_init(), so early_ioremap()
94 * or early_memremap() should be called here to for ACPI table mapping.
96 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
101 return early_memremap(phys, size);
104 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
109 early_memunmap(map, size);
112 bool __init acpi_psci_present(void)
114 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
117 /* Whether HVC must be used instead of SMC as the PSCI conduit */
118 bool acpi_psci_use_hvc(void)
120 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
124 * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
127 * Return 0 on success, <0 on failure
129 static int __init acpi_fadt_sanity_check(void)
131 struct acpi_table_header *table;
132 struct acpi_table_fadt *fadt;
137 * FADT is required on arm64; retrieve it to check its presence
138 * and carry out revision and ACPI HW reduced compliancy tests
140 status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
141 if (ACPI_FAILURE(status)) {
142 const char *msg = acpi_format_exception(status);
144 pr_err("Failed to get FADT table, %s\n", msg);
148 fadt = (struct acpi_table_fadt *)table;
151 * Revision in table header is the FADT Major revision, and there
152 * is a minor revision of FADT which was introduced by ACPI 5.1,
153 * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
154 * boot protocol configuration data.
156 if (table->revision < 5 ||
157 (table->revision == 5 && fadt->minor_revision < 1)) {
158 pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 5.1+\n",
159 table->revision, fadt->minor_revision);
161 if (!fadt->arm_boot_flags) {
165 pr_err("FADT has ARM boot flags set, assuming 5.1\n");
168 if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
169 pr_err("FADT not ACPI hardware reduced compliant\n");
175 * acpi_get_table() creates FADT table mapping that
176 * should be released after parsing and before resuming boot
178 acpi_put_table(table);
183 * acpi_boot_table_init() called from setup_arch(), always.
184 * 1. find RSDP and get its address, and then find XSDT
185 * 2. extract all tables and checksums them all
186 * 3. check ACPI FADT revision
187 * 4. check ACPI FADT HW reduced flag
189 * We can parse ACPI boot-time tables such as MADT after
190 * this function is called.
192 * On return ACPI is enabled if either:
194 * - ACPI tables are initialized and sanity checks passed
195 * - acpi=force was passed in the command line and ACPI was not disabled
196 * explicitly through acpi=off command line parameter
198 * ACPI is disabled on function return otherwise
200 void __init acpi_boot_table_init(void)
203 * Enable ACPI instead of device tree unless
204 * - ACPI has been disabled explicitly (acpi=off), or
205 * - the device tree is not empty (it has more than just a /chosen node,
206 * and a /hypervisor node when running on Xen)
207 * and ACPI has not been [force] enabled (acpi=on|force)
209 if (param_acpi_off ||
210 (!param_acpi_on && !param_acpi_force &&
211 of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
215 * ACPI is disabled at this point. Enable it in order to parse
216 * the ACPI tables and carry out sanity checks
221 * If ACPI tables are initialized and FADT sanity checks passed,
222 * leave ACPI enabled and carry on booting; otherwise disable ACPI
223 * on initialization error.
224 * If acpi=force was passed on the command line it forces ACPI
225 * to be enabled even if its initialization failed.
227 if (acpi_table_init() || acpi_fadt_sanity_check()) {
228 pr_err("Failed to init ACPI tables\n");
229 if (!param_acpi_force)
235 if (earlycon_acpi_spcr_enable)
236 early_init_dt_scan_chosen_stdout();
238 acpi_parse_spcr(earlycon_acpi_spcr_enable, true);
239 if (IS_ENABLED(CONFIG_ACPI_BGRT))
240 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
244 pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
247 * According to "Table 8 Map: EFI memory types to AArch64 memory
248 * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
249 * mapped to a corresponding MAIR attribute encoding.
250 * The EFI memory attribute advises all possible capabilities
251 * of a memory region. We use the most efficient capability.
256 attr = efi_mem_attributes(addr);
257 if (attr & EFI_MEMORY_WB)
259 if (attr & EFI_MEMORY_WT)
260 return __pgprot(PROT_NORMAL_WT);
261 if (attr & EFI_MEMORY_WC)
262 return __pgprot(PROT_NORMAL_NC);
263 return __pgprot(PROT_DEVICE_nGnRnE);
267 * Claim Synchronous External Aborts as a firmware first notification.
269 * Used by KVM and the arch do_sea handler.
270 * @regs may be NULL when called from process context.
272 int apei_claim_sea(struct pt_regs *regs)
275 unsigned long current_flags;
277 if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
280 current_flags = arch_local_save_flags();
283 * SEA can interrupt SError, mask it and describe this as an NMI so
284 * that APEI defers the handling.
286 local_daif_restore(DAIF_ERRCTX);
288 err = ghes_notify_sea();
290 local_daif_restore(current_flags);