acpi.c 6.3 KB

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  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. #define pr_fmt(fmt) "ACPI: " fmt
  16. #include <linux/acpi.h>
  17. #include <linux/bootmem.h>
  18. #include <linux/cpumask.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 <asm/cputype.h>
  26. #include <asm/cpu_ops.h>
  27. #include <asm/smp_plat.h>
  28. #ifdef CONFIG_ACPI_APEI
  29. # include <linux/efi.h>
  30. # include <asm/pgtable.h>
  31. #endif
  32. int acpi_noirq = 1; /* skip ACPI IRQ initialization */
  33. int acpi_disabled = 1;
  34. EXPORT_SYMBOL(acpi_disabled);
  35. int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
  36. EXPORT_SYMBOL(acpi_pci_disabled);
  37. static bool param_acpi_off __initdata;
  38. static bool param_acpi_force __initdata;
  39. static int __init parse_acpi(char *arg)
  40. {
  41. if (!arg)
  42. return -EINVAL;
  43. /* "acpi=off" disables both ACPI table parsing and interpreter */
  44. if (strcmp(arg, "off") == 0)
  45. param_acpi_off = true;
  46. else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
  47. param_acpi_force = true;
  48. else
  49. return -EINVAL; /* Core will print when we return error */
  50. return 0;
  51. }
  52. early_param("acpi", parse_acpi);
  53. static int __init dt_scan_depth1_nodes(unsigned long node,
  54. const char *uname, int depth,
  55. void *data)
  56. {
  57. /*
  58. * Return 1 as soon as we encounter a node at depth 1 that is
  59. * not the /chosen node.
  60. */
  61. if (depth == 1 && (strcmp(uname, "chosen") != 0))
  62. return 1;
  63. return 0;
  64. }
  65. /*
  66. * __acpi_map_table() will be called before page_init(), so early_ioremap()
  67. * or early_memremap() should be called here to for ACPI table mapping.
  68. */
  69. char *__init __acpi_map_table(unsigned long phys, unsigned long size)
  70. {
  71. if (!size)
  72. return NULL;
  73. return early_memremap(phys, size);
  74. }
  75. void __init __acpi_unmap_table(char *map, unsigned long size)
  76. {
  77. if (!map || !size)
  78. return;
  79. early_memunmap(map, size);
  80. }
  81. bool __init acpi_psci_present(void)
  82. {
  83. return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
  84. }
  85. /* Whether HVC must be used instead of SMC as the PSCI conduit */
  86. bool __init acpi_psci_use_hvc(void)
  87. {
  88. return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
  89. }
  90. /*
  91. * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
  92. * checks on it
  93. *
  94. * Return 0 on success, <0 on failure
  95. */
  96. static int __init acpi_fadt_sanity_check(void)
  97. {
  98. struct acpi_table_header *table;
  99. struct acpi_table_fadt *fadt;
  100. acpi_status status;
  101. acpi_size tbl_size;
  102. int ret = 0;
  103. /*
  104. * FADT is required on arm64; retrieve it to check its presence
  105. * and carry out revision and ACPI HW reduced compliancy tests
  106. */
  107. status = acpi_get_table_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
  108. if (ACPI_FAILURE(status)) {
  109. const char *msg = acpi_format_exception(status);
  110. pr_err("Failed to get FADT table, %s\n", msg);
  111. return -ENODEV;
  112. }
  113. fadt = (struct acpi_table_fadt *)table;
  114. /*
  115. * Revision in table header is the FADT Major revision, and there
  116. * is a minor revision of FADT which was introduced by ACPI 5.1,
  117. * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
  118. * boot protocol configuration data.
  119. */
  120. if (table->revision < 5 ||
  121. (table->revision == 5 && fadt->minor_revision < 1)) {
  122. pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n",
  123. table->revision, fadt->minor_revision);
  124. ret = -EINVAL;
  125. goto out;
  126. }
  127. if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
  128. pr_err("FADT not ACPI hardware reduced compliant\n");
  129. ret = -EINVAL;
  130. }
  131. out:
  132. /*
  133. * acpi_get_table_with_size() creates FADT table mapping that
  134. * should be released after parsing and before resuming boot
  135. */
  136. early_acpi_os_unmap_memory(table, tbl_size);
  137. return ret;
  138. }
  139. /*
  140. * acpi_boot_table_init() called from setup_arch(), always.
  141. * 1. find RSDP and get its address, and then find XSDT
  142. * 2. extract all tables and checksums them all
  143. * 3. check ACPI FADT revision
  144. * 4. check ACPI FADT HW reduced flag
  145. *
  146. * We can parse ACPI boot-time tables such as MADT after
  147. * this function is called.
  148. *
  149. * On return ACPI is enabled if either:
  150. *
  151. * - ACPI tables are initialized and sanity checks passed
  152. * - acpi=force was passed in the command line and ACPI was not disabled
  153. * explicitly through acpi=off command line parameter
  154. *
  155. * ACPI is disabled on function return otherwise
  156. */
  157. void __init acpi_boot_table_init(void)
  158. {
  159. /*
  160. * Enable ACPI instead of device tree unless
  161. * - ACPI has been disabled explicitly (acpi=off), or
  162. * - the device tree is not empty (it has more than just a /chosen node)
  163. * and ACPI has not been force enabled (acpi=force)
  164. */
  165. if (param_acpi_off ||
  166. (!param_acpi_force && of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
  167. return;
  168. /*
  169. * ACPI is disabled at this point. Enable it in order to parse
  170. * the ACPI tables and carry out sanity checks
  171. */
  172. enable_acpi();
  173. /*
  174. * If ACPI tables are initialized and FADT sanity checks passed,
  175. * leave ACPI enabled and carry on booting; otherwise disable ACPI
  176. * on initialization error.
  177. * If acpi=force was passed on the command line it forces ACPI
  178. * to be enabled even if its initialization failed.
  179. */
  180. if (acpi_table_init() || acpi_fadt_sanity_check()) {
  181. pr_err("Failed to init ACPI tables\n");
  182. if (!param_acpi_force)
  183. disable_acpi();
  184. }
  185. }
  186. #ifdef CONFIG_ACPI_APEI
  187. pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
  188. {
  189. /*
  190. * According to "Table 8 Map: EFI memory types to AArch64 memory
  191. * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
  192. * mapped to a corresponding MAIR attribute encoding.
  193. * The EFI memory attribute advises all possible capabilities
  194. * of a memory region. We use the most efficient capability.
  195. */
  196. u64 attr;
  197. attr = efi_mem_attributes(addr);
  198. if (attr & EFI_MEMORY_WB)
  199. return PAGE_KERNEL;
  200. if (attr & EFI_MEMORY_WT)
  201. return __pgprot(PROT_NORMAL_WT);
  202. if (attr & EFI_MEMORY_WC)
  203. return __pgprot(PROT_NORMAL_NC);
  204. return __pgprot(PROT_DEVICE_nGnRnE);
  205. }
  206. #endif