// SPDX-License-Identifier: GPL-2.0-or-later/* * acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> */ #define pr_fmt(fmt) "ACPI: utils: " fmt #include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/types.h>#include <linux/hardirq.h>#include <linux/acpi.h>#include <linux/dynamic_debug.h> #include "internal.h"#include "sleep.h" /* -------------------------------------------------------------------------- Object Evaluation Helpers -------------------------------------------------------------------------- */static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s){ acpi_handle_debug(h, "Evaluate [%s]: %s\n", p, acpi_format_exception(s));} acpi_statusacpi_extract_package(union acpi_object *package, struct acpi_buffer *format, struct acpi_buffer *buffer){ u32 size_required = 0; u32 tail_offset = 0; char *format_string = NULL; u32 format_count = 0; u32 i = 0; u8 *head = NULL; u8 *tail = NULL; if (!package || (package->type != ACPI_TYPE_PACKAGE) || (package->package.count < 1)) { pr_debug("Invalid package argument\n"); return AE_BAD_PARAMETER; } if (!format || !format->pointer || (format->length < 1)) { pr_debug("Invalid format argument\n"); return AE_BAD_PARAMETER; } if (!buffer) { pr_debug("Invalid buffer argument\n"); return AE_BAD_PARAMETER; } format_count = (format->length / sizeof(char)) - 1; if (format_count > package->package.count) { pr_debug("Format specifies more objects [%d] than present [%d]\n", format_count, package->package.count); return AE_BAD_DATA; } format_string = format->pointer; /* * Calculate size_required. */ for (i = 0; i < format_count; i++) { union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': size_required += sizeof(u64); tail_offset += sizeof(u64); break; case 'S': size_required += sizeof(char *) + sizeof(u64) + sizeof(char); tail_offset += sizeof(char *); break; default: pr_debug("Invalid package element [%d]: got number, expected [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': size_required += sizeof(char *) + (element->string.length * sizeof(char)) + sizeof(char); tail_offset += sizeof(char *); break; case 'B': size_required += sizeof(u8 *) + element->buffer.length; tail_offset += sizeof(u8 *); break; default: pr_debug("Invalid package element [%d] got string/buffer, expected [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': size_required += sizeof(void *); tail_offset += sizeof(void *); break; default: pr_debug("Invalid package element [%d] got reference, expected [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_PACKAGE: default: pr_debug("Unsupported element at index=%d\n", i); /* TBD: handle nested packages... */ return AE_SUPPORT; } } /* * Validate output buffer. */ if (buffer->length == ACPI_ALLOCATE_BUFFER) { buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); if (!buffer->pointer) return AE_NO_MEMORY; buffer->length = size_required; } else { if (buffer->length < size_required) { buffer->length = size_required; return AE_BUFFER_OVERFLOW; } else if (buffer->length != size_required || !buffer->pointer) { return AE_BAD_PARAMETER; } } head = buffer->pointer; tail = buffer->pointer + tail_offset; /* * Extract package data. */ for (i = 0; i < format_count; i++) { u8 **pointer = NULL; union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': *((u64 *) head) = element->integer.value; head += sizeof(u64); break; case 'S': pointer = (u8 **) head; *pointer = tail; *((u64 *) tail) = element->integer.value; head += sizeof(u64 *); tail += sizeof(u64); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->string.pointer, element->string.length); head += sizeof(char *); tail += element->string.length * sizeof(char); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; case 'B': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->buffer.pointer, element->buffer.length); head += sizeof(u8 *); tail += element->buffer.length; break; default: /* Should never get here */ break; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': *(void **)head = (void *)element->reference.handle; head += sizeof(void *); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_PACKAGE: /* TBD: handle nested packages... */ default: /* Should never get here */ break; } } return AE_OK;} EXPORT_SYMBOL(acpi_extract_package); acpi_statusacpi_evaluate_integer(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, unsigned long long *data){ acpi_status status = AE_OK; union acpi_object element; struct acpi_buffer buffer = { 0, NULL }; if (!data) return AE_BAD_PARAMETER; buffer.length = sizeof(union acpi_object); buffer.pointer = &element; status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) { acpi_util_eval_error(handle, pathname, status); return status; } if (element.type != ACPI_TYPE_INTEGER) { acpi_util_eval_error(handle, pathname, AE_BAD_DATA); return AE_BAD_DATA; } *data = element.integer.value; acpi_handle_debug(handle, "Return value [%llu]\n", *data); return AE_OK;} EXPORT_SYMBOL(acpi_evaluate_integer); int acpi_get_local_address(acpi_handle handle, u32 *addr){ unsigned long long adr; acpi_status status; status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr); if (ACPI_FAILURE(status)) return -ENODATA; *addr = (u32)adr; return 0;}EXPORT_SYMBOL(acpi_get_local_address); #define ACPI_MAX_SUB_BUF_SIZE 9 const char *acpi_get_subsystem_id(acpi_handle handle){ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; acpi_status status; const char *sub; size_t len; status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status); return ERR_PTR(-ENODATA); } obj = buffer.pointer; if (obj->type == ACPI_TYPE_STRING) { len = strlen(obj->string.pointer); if (len < ACPI_MAX_SUB_BUF_SIZE && len > 0) { sub = kstrdup(obj->string.pointer, GFP_KERNEL); if (!sub) sub = ERR_PTR(-ENOMEM); } else { acpi_handle_err(handle, "ACPI _SUB Length %zu is Invalid\n", len); sub = ERR_PTR(-ENODATA); } } else { acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n"); sub = ERR_PTR(-ENODATA); } acpi_os_free(buffer.pointer); return sub;}EXPORT_SYMBOL_GPL(acpi_get_subsystem_id); acpi_statusacpi_evaluate_reference(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, struct acpi_handle_list *list){ acpi_status status = AE_OK; union acpi_object *package = NULL; union acpi_object *element = NULL; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; u32 i = 0; if (!list) { return AE_BAD_PARAMETER; } /* Evaluate object. */ status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) goto end; package = buffer.pointer; if ((buffer.length == 0) || !package) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->type != ACPI_TYPE_PACKAGE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (!package->package.count) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->package.count > ACPI_MAX_HANDLES) { kfree(package); return AE_NO_MEMORY; } list->count = package->package.count; /* Extract package data. */ for (i = 0; i < list->count; i++) { element = &(package->package.elements[i]); if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); break; } if (!element->reference.handle) { status = AE_NULL_ENTRY; acpi_util_eval_error(handle, pathname, status); break; } /* Get the acpi_handle. */ list->handles[i] = element->reference.handle; acpi_handle_debug(list->handles[i], "Found in reference list\n"); } end: if (ACPI_FAILURE(status)) { list->count = 0; //kfree(list->handles); } kfree(buffer.pointer); return status;} EXPORT_SYMBOL(acpi_evaluate_reference); acpi_statusacpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld){ acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *output; status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); if (ACPI_FAILURE(status)) return status; output = buffer.pointer; if (!output || output->type != ACPI_TYPE_PACKAGE || !output->package.count || output->package.elements[0].type != ACPI_TYPE_BUFFER || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { status = AE_TYPE; goto out; } status = acpi_decode_pld_buffer( output->package.elements[0].buffer.pointer, output->package.elements[0].buffer.length, pld); out: kfree(buffer.pointer); return status;}EXPORT_SYMBOL(acpi_get_physical_device_location); /** * acpi_evaluate_ost: Evaluate _OST for hotplug operations * @handle: ACPI device handle * @source_event: source event code * @status_code: status code * @status_buf: optional detailed information (NULL if none) * * Evaluate _OST for hotplug operations. All ACPI hotplug handlers * must call this function when evaluating _OST for hotplug operations. * When the platform does not support _OST, this function has no effect. */acpi_statusacpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, struct acpi_buffer *status_buf){ union acpi_object params[3] = { {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_BUFFER,} }; struct acpi_object_list arg_list = {3, params}; params[0].integer.value = source_event; params[1].integer.value = status_code; if (status_buf != NULL) { params[2].buffer.pointer = status_buf->pointer; params[2].buffer.length = status_buf->length; } else { params[2].buffer.pointer = NULL; params[2].buffer.length = 0; } return acpi_evaluate_object(handle, "_OST", &arg_list, NULL);}EXPORT_SYMBOL(acpi_evaluate_ost); /** * acpi_handle_path: Return the object path of handle * @handle: ACPI device handle * * Caller must free the returned buffer */static char *acpi_handle_path(acpi_handle handle){ struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, .pointer = NULL }; if (in_interrupt() || acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) return NULL; return buffer.pointer;Lines 1–500 of 1028. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> */ #define pr_fmt(fmt) "ACPI: utils: " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/types.h> #include <linux/hardirq.h> #include <linux/acpi.h> #include <linux/dynamic_debug.h> #include "internal.h" #include "sleep.h" /* -------------------------------------------------------------------------- Object Evaluation Helpers -------------------------------------------------------------------------- */ static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) { acpi_handle_debug(h, "Evaluate [%s]: %s\n", p, acpi_format_exception(s)); } acpi_status acpi_extract_package(union acpi_object *package, struct acpi_buffer *format, struct acpi_buffer *buffer) { u32 size_required = 0; u32 tail_offset = 0; char *format_string = NULL; u32 format_count = 0; u32 i = 0; u8 *head = NULL; u8 *tail = NULL; if (!package || (package->type != ACPI_TYPE_PACKAGE) || (package->package.count < 1)) { pr_debug("Invalid package argument\n"); return AE_BAD_PARAMETER; } if (!format || !format->pointer || (format->length < 1)) { pr_debug("Invalid format argument\n"); return AE_BAD_PARAMETER; } if (!buffer) { pr_debug("Invalid buffer argument\n"); return AE_BAD_PARAMETER; } format_count = (format->length / sizeof(char)) - 1; if (format_count > package->package.count) { pr_debug("Format specifies more objects [%d] than present [%d]\n", format_count, package->package.count); return AE_BAD_DATA; } format_string = format->pointer; /* * Calculate size_required. */ for (i = 0; i < format_count; i++) { union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': size_required += sizeof(u64); tail_offset += sizeof(u64); break; case 'S': size_required += sizeof(char *) + sizeof(u64) + sizeof(char); tail_offset += sizeof(char *); break; default: pr_debug("Invalid package element [%d]: got number, expected [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': size_required += sizeof(char *) + (element->string.length * sizeof(char)) + sizeof(char); tail_offset += sizeof(char *); break; case 'B': size_required += sizeof(u8 *) + element->buffer.length; tail_offset += sizeof(u8 *); break; default: pr_debug("Invalid package element [%d] got string/buffer, expected [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': size_required += sizeof(void *); tail_offset += sizeof(void *); break; default: pr_debug("Invalid package element [%d] got reference, expected [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_PACKAGE: default: pr_debug("Unsupported element at index=%d\n", i); /* TBD: handle nested packages... */ return AE_SUPPORT; } } /* * Validate output buffer. */ if (buffer->length == ACPI_ALLOCATE_BUFFER) { buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); if (!buffer->pointer) return AE_NO_MEMORY; buffer->length = size_required; } else { if (buffer->length < size_required) { buffer->length = size_required; return AE_BUFFER_OVERFLOW; } else if (buffer->length != size_required || !buffer->pointer) { return AE_BAD_PARAMETER; } } head = buffer->pointer; tail = buffer->pointer + tail_offset; /* * Extract package data. */ for (i = 0; i < format_count; i++) { u8 **pointer = NULL; union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': *((u64 *) head) = element->integer.value; head += sizeof(u64); break; case 'S': pointer = (u8 **) head; *pointer = tail; *((u64 *) tail) = element->integer.value; head += sizeof(u64 *); tail += sizeof(u64); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->string.pointer, element->string.length); head += sizeof(char *); tail += element->string.length * sizeof(char); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; case 'B': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->buffer.pointer, element->buffer.length); head += sizeof(u8 *); tail += element->buffer.length; break; default: /* Should never get here */ break; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': *(void **)head = (void *)element->reference.handle; head += sizeof(void *); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_PACKAGE: /* TBD: handle nested packages... */ default: /* Should never get here */ break; } } return AE_OK; } EXPORT_SYMBOL(acpi_extract_package); acpi_status acpi_evaluate_integer(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, unsigned long long *data) { acpi_status status = AE_OK; union acpi_object element; struct acpi_buffer buffer = { 0, NULL }; if (!data) return AE_BAD_PARAMETER; buffer.length = sizeof(union acpi_object); buffer.pointer = &element; status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) { acpi_util_eval_error(handle, pathname, status); return status; } if (element.type != ACPI_TYPE_INTEGER) { acpi_util_eval_error(handle, pathname, AE_BAD_DATA); return AE_BAD_DATA; } *data = element.integer.value; acpi_handle_debug(handle, "Return value [%llu]\n", *data); return AE_OK; } EXPORT_SYMBOL(acpi_evaluate_integer); int acpi_get_local_address(acpi_handle handle, u32 *addr) { unsigned long long adr; acpi_status status; status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr); if (ACPI_FAILURE(status)) return -ENODATA; *addr = (u32)adr; return 0; } EXPORT_SYMBOL(acpi_get_local_address); #define ACPI_MAX_SUB_BUF_SIZE 9 const char *acpi_get_subsystem_id(acpi_handle handle) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; acpi_status status; const char *sub; size_t len; status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status); return ERR_PTR(-ENODATA); } obj = buffer.pointer; if (obj->type == ACPI_TYPE_STRING) { len = strlen(obj->string.pointer); if (len < ACPI_MAX_SUB_BUF_SIZE && len > 0) { sub = kstrdup(obj->string.pointer, GFP_KERNEL); if (!sub) sub = ERR_PTR(-ENOMEM); } else { acpi_handle_err(handle, "ACPI _SUB Length %zu is Invalid\n", len); sub = ERR_PTR(-ENODATA); } } else { acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n"); sub = ERR_PTR(-ENODATA); } acpi_os_free(buffer.pointer); return sub; } EXPORT_SYMBOL_GPL(acpi_get_subsystem_id); acpi_status acpi_evaluate_reference(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, struct acpi_handle_list *list) { acpi_status status = AE_OK; union acpi_object *package = NULL; union acpi_object *element = NULL; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; u32 i = 0; if (!list) { return AE_BAD_PARAMETER; } /* Evaluate object. */ status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) goto end; package = buffer.pointer; if ((buffer.length == 0) || !package) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->type != ACPI_TYPE_PACKAGE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (!package->package.count) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->package.count > ACPI_MAX_HANDLES) { kfree(package); return AE_NO_MEMORY; } list->count = package->package.count; /* Extract package data. */ for (i = 0; i < list->count; i++) { element = &(package->package.elements[i]); if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); break; } if (!element->reference.handle) { status = AE_NULL_ENTRY; acpi_util_eval_error(handle, pathname, status); break; } /* Get the acpi_handle. */ list->handles[i] = element->reference.handle; acpi_handle_debug(list->handles[i], "Found in reference list\n"); } end: if (ACPI_FAILURE(status)) { list->count = 0; //kfree(list->handles); } kfree(buffer.pointer); return status; } EXPORT_SYMBOL(acpi_evaluate_reference); acpi_status acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *output; status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); if (ACPI_FAILURE(status)) return status; output = buffer.pointer; if (!output || output->type != ACPI_TYPE_PACKAGE || !output->package.count || output->package.elements[0].type != ACPI_TYPE_BUFFER || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { status = AE_TYPE; goto out; } status = acpi_decode_pld_buffer( output->package.elements[0].buffer.pointer, output->package.elements[0].buffer.length, pld); out: kfree(buffer.pointer); return status; } EXPORT_SYMBOL(acpi_get_physical_device_location); /** * acpi_evaluate_ost: Evaluate _OST for hotplug operations * @handle: ACPI device handle * @source_event: source event code * @status_code: status code * @status_buf: optional detailed information (NULL if none) * * Evaluate _OST for hotplug operations. All ACPI hotplug handlers * must call this function when evaluating _OST for hotplug operations. * When the platform does not support _OST, this function has no effect. */ acpi_status acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, struct acpi_buffer *status_buf) { union acpi_object params[3] = { {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_BUFFER,} }; struct acpi_object_list arg_list = {3, params}; params[0].integer.value = source_event; params[1].integer.value = status_code; if (status_buf != NULL) { params[2].buffer.pointer = status_buf->pointer; params[2].buffer.length = status_buf->length; } else { params[2].buffer.pointer = NULL; params[2].buffer.length = 0; } return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); } EXPORT_SYMBOL(acpi_evaluate_ost); /** * acpi_handle_path: Return the object path of handle * @handle: ACPI device handle * * Caller must free the returned buffer */ static char *acpi_handle_path(acpi_handle handle) { struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, .pointer = NULL }; if (in_interrupt() || acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) return NULL; return buffer.pointer;