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 34 int acpi_noirq = 1; /* skip ACPI IRQ initialization */ 35 int acpi_disabled = 1; 36 EXPORT_SYMBOL(acpi_disabled); 37 38 int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */ 39 EXPORT_SYMBOL(acpi_pci_disabled); 40 41 static bool param_acpi_off __initdata; 42 static bool param_acpi_on __initdata; 43 static bool param_acpi_force __initdata; 44 45 static 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 } 62 early_param("acpi", parse_acpi); 63 64 static 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 */ 93 void __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 } 100 101 void __init __acpi_unmap_table(void __iomem *map, unsigned long size) 102 { 103 if (!map || !size) 104 return; 105 106 early_memunmap(map, size); 107 } 108 109 bool __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 */ 115 bool 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 */ 126 static 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("Unsupported FADT revision %d.%d, should be 5.1+\n", 156 table->revision, fadt->minor_revision); 157 ret = -EINVAL; 158 goto out; 159 } 160 161 if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) { 162 pr_err("FADT not ACPI hardware reduced compliant\n"); 163 ret = -EINVAL; 164 } 165 166 out: 167 /* 168 * acpi_get_table() creates FADT table mapping that 169 * should be released after parsing and before resuming boot 170 */ 171 acpi_put_table(table); 172 return ret; 173 } 174 175 /* 176 * acpi_boot_table_init() called from setup_arch(), always. 177 * 1. find RSDP and get its address, and then find XSDT 178 * 2. extract all tables and checksums them all 179 * 3. check ACPI FADT revision 180 * 4. check ACPI FADT HW reduced flag 181 * 182 * We can parse ACPI boot-time tables such as MADT after 183 * this function is called. 184 * 185 * On return ACPI is enabled if either: 186 * 187 * - ACPI tables are initialized and sanity checks passed 188 * - acpi=force was passed in the command line and ACPI was not disabled 189 * explicitly through acpi=off command line parameter 190 * 191 * ACPI is disabled on function return otherwise 192 */ 193 void __init acpi_boot_table_init(void) 194 { 195 /* 196 * Enable ACPI instead of device tree unless 197 * - ACPI has been disabled explicitly (acpi=off), or 198 * - the device tree is not empty (it has more than just a /chosen node, 199 * and a /hypervisor node when running on Xen) 200 * and ACPI has not been [force] enabled (acpi=on|force) 201 */ 202 if (param_acpi_off || 203 (!param_acpi_on && !param_acpi_force && 204 of_scan_flat_dt(dt_scan_depth1_nodes, NULL))) 205 goto done; 206 207 /* 208 * ACPI is disabled at this point. Enable it in order to parse 209 * the ACPI tables and carry out sanity checks 210 */ 211 enable_acpi(); 212 213 /* 214 * If ACPI tables are initialized and FADT sanity checks passed, 215 * leave ACPI enabled and carry on booting; otherwise disable ACPI 216 * on initialization error. 217 * If acpi=force was passed on the command line it forces ACPI 218 * to be enabled even if its initialization failed. 219 */ 220 if (acpi_table_init() || acpi_fadt_sanity_check()) { 221 pr_err("Failed to init ACPI tables\n"); 222 if (!param_acpi_force) 223 disable_acpi(); 224 } 225 226 done: 227 if (acpi_disabled) { 228 if (earlycon_acpi_spcr_enable) 229 early_init_dt_scan_chosen_stdout(); 230 } else { 231 acpi_parse_spcr(earlycon_acpi_spcr_enable, true); 232 if (IS_ENABLED(CONFIG_ACPI_BGRT)) 233 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt); 234 } 235 } 236 237 pgprot_t __acpi_get_mem_attribute(phys_addr_t addr) 238 { 239 /* 240 * According to "Table 8 Map: EFI memory types to AArch64 memory 241 * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is 242 * mapped to a corresponding MAIR attribute encoding. 243 * The EFI memory attribute advises all possible capabilities 244 * of a memory region. We use the most efficient capability. 245 */ 246 247 u64 attr; 248 249 attr = efi_mem_attributes(addr); 250 if (attr & EFI_MEMORY_WB) 251 return PAGE_KERNEL; 252 if (attr & EFI_MEMORY_WT) 253 return __pgprot(PROT_NORMAL_WT); 254 if (attr & EFI_MEMORY_WC) 255 return __pgprot(PROT_NORMAL_NC); 256 return __pgprot(PROT_DEVICE_nGnRnE); 257 } 258 259 /* 260 * Claim Synchronous External Aborts as a firmware first notification. 261 * 262 * Used by KVM and the arch do_sea handler. 263 * @regs may be NULL when called from process context. 264 */ 265 int apei_claim_sea(struct pt_regs *regs) 266 { 267 int err = -ENOENT; 268 unsigned long current_flags; 269 270 if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES)) 271 return err; 272 273 current_flags = arch_local_save_flags(); 274 275 /* 276 * SEA can interrupt SError, mask it and describe this as an NMI so 277 * that APEI defers the handling. 278 */ 279 local_daif_restore(DAIF_ERRCTX); 280 nmi_enter(); 281 err = ghes_notify_sea(); 282 nmi_exit(); 283 local_daif_restore(current_flags); 284 285 return err; 286 } 287