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![Rafael J. Wysocki](/assets/img/avatar_default.png)
If a pointer to an uninitialized struct acpi_handle_list is passed to
acpi_evaluate_reference() and it decides to bail out early, either
because acpi_evaluate_object() fails, or because it produces invalid
data, the handles pointer from the struct acpi_handle_list will be
passed to kfree() and if it is not NULL, the kernel will crash on an
attempt to free unallocated memory.
Address this by moving the "end" label in acpi_evaluate_reference() to
the end of the function, which is sufficient, because no cleanup is
needed in that case.
Fixes: 2e57d10a65
("ACPI: utils: Dynamically determine acpi_handle_list size")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Woody Suwalski <terraluna977@gmail.com>
1106 lines
29 KiB
C
1106 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*/
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#define pr_fmt(fmt) "ACPI: utils: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/hardirq.h>
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#include <linux/acpi.h>
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#include <linux/dynamic_debug.h>
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#include "internal.h"
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#include "sleep.h"
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/* --------------------------------------------------------------------------
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Object Evaluation Helpers
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-------------------------------------------------------------------------- */
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static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
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{
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acpi_handle_debug(h, "Evaluate [%s]: %s\n", p, acpi_format_exception(s));
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}
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acpi_status
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acpi_extract_package(union acpi_object *package,
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struct acpi_buffer *format, struct acpi_buffer *buffer)
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{
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u32 size_required = 0;
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u32 tail_offset = 0;
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char *format_string = NULL;
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u32 format_count = 0;
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u32 i = 0;
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u8 *head = NULL;
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u8 *tail = NULL;
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if (!package || (package->type != ACPI_TYPE_PACKAGE)
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|| (package->package.count < 1)) {
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pr_debug("Invalid package argument\n");
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return AE_BAD_PARAMETER;
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}
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if (!format || !format->pointer || (format->length < 1)) {
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pr_debug("Invalid format argument\n");
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return AE_BAD_PARAMETER;
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}
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if (!buffer) {
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pr_debug("Invalid buffer argument\n");
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return AE_BAD_PARAMETER;
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}
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format_count = (format->length / sizeof(char)) - 1;
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if (format_count > package->package.count) {
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pr_debug("Format specifies more objects [%d] than present [%d]\n",
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format_count, package->package.count);
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return AE_BAD_DATA;
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}
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format_string = format->pointer;
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/*
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* Calculate size_required.
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*/
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for (i = 0; i < format_count; i++) {
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union acpi_object *element = &(package->package.elements[i]);
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switch (element->type) {
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case ACPI_TYPE_INTEGER:
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switch (format_string[i]) {
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case 'N':
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size_required += sizeof(u64);
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tail_offset += sizeof(u64);
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break;
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case 'S':
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size_required +=
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sizeof(char *) + sizeof(u64) +
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sizeof(char);
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tail_offset += sizeof(char *);
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break;
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default:
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pr_debug("Invalid package element [%d]: got number, expected [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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}
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break;
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case ACPI_TYPE_STRING:
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case ACPI_TYPE_BUFFER:
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switch (format_string[i]) {
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case 'S':
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size_required +=
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sizeof(char *) +
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(element->string.length * sizeof(char)) +
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sizeof(char);
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tail_offset += sizeof(char *);
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break;
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case 'B':
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size_required +=
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sizeof(u8 *) + element->buffer.length;
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tail_offset += sizeof(u8 *);
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break;
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default:
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pr_debug("Invalid package element [%d] got string/buffer, expected [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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}
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break;
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case ACPI_TYPE_LOCAL_REFERENCE:
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switch (format_string[i]) {
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case 'R':
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size_required += sizeof(void *);
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tail_offset += sizeof(void *);
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break;
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default:
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pr_debug("Invalid package element [%d] got reference, expected [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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}
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break;
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case ACPI_TYPE_PACKAGE:
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default:
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pr_debug("Unsupported element at index=%d\n", i);
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/* TBD: handle nested packages... */
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return AE_SUPPORT;
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}
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}
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/*
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* Validate output buffer.
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*/
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if (buffer->length == ACPI_ALLOCATE_BUFFER) {
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buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required);
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if (!buffer->pointer)
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return AE_NO_MEMORY;
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buffer->length = size_required;
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} else {
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if (buffer->length < size_required) {
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buffer->length = size_required;
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return AE_BUFFER_OVERFLOW;
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} else if (buffer->length != size_required ||
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!buffer->pointer) {
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return AE_BAD_PARAMETER;
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}
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}
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head = buffer->pointer;
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tail = buffer->pointer + tail_offset;
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/*
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* Extract package data.
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*/
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for (i = 0; i < format_count; i++) {
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u8 **pointer = NULL;
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union acpi_object *element = &(package->package.elements[i]);
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switch (element->type) {
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case ACPI_TYPE_INTEGER:
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switch (format_string[i]) {
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case 'N':
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*((u64 *) head) =
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element->integer.value;
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head += sizeof(u64);
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break;
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case 'S':
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pointer = (u8 **) head;
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*pointer = tail;
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*((u64 *) tail) =
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element->integer.value;
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head += sizeof(u64 *);
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tail += sizeof(u64);
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/* NULL terminate string */
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*tail = (char)0;
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tail += sizeof(char);
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break;
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default:
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/* Should never get here */
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break;
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}
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break;
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case ACPI_TYPE_STRING:
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case ACPI_TYPE_BUFFER:
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switch (format_string[i]) {
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case 'S':
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pointer = (u8 **) head;
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*pointer = tail;
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memcpy(tail, element->string.pointer,
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element->string.length);
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head += sizeof(char *);
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tail += element->string.length * sizeof(char);
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/* NULL terminate string */
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*tail = (char)0;
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tail += sizeof(char);
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break;
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case 'B':
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pointer = (u8 **) head;
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*pointer = tail;
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memcpy(tail, element->buffer.pointer,
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element->buffer.length);
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head += sizeof(u8 *);
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tail += element->buffer.length;
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break;
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default:
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/* Should never get here */
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break;
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}
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break;
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case ACPI_TYPE_LOCAL_REFERENCE:
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switch (format_string[i]) {
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case 'R':
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*(void **)head =
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(void *)element->reference.handle;
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head += sizeof(void *);
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break;
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default:
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/* Should never get here */
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break;
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}
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break;
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case ACPI_TYPE_PACKAGE:
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/* TBD: handle nested packages... */
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default:
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/* Should never get here */
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break;
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}
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}
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return AE_OK;
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}
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EXPORT_SYMBOL(acpi_extract_package);
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acpi_status
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acpi_evaluate_integer(acpi_handle handle,
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acpi_string pathname,
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struct acpi_object_list *arguments, unsigned long long *data)
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{
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acpi_status status = AE_OK;
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union acpi_object element;
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struct acpi_buffer buffer = { 0, NULL };
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if (!data)
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return AE_BAD_PARAMETER;
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buffer.length = sizeof(union acpi_object);
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buffer.pointer = &element;
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status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
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if (ACPI_FAILURE(status)) {
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acpi_util_eval_error(handle, pathname, status);
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return status;
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}
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if (element.type != ACPI_TYPE_INTEGER) {
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acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
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return AE_BAD_DATA;
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}
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*data = element.integer.value;
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acpi_handle_debug(handle, "Return value [%llu]\n", *data);
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return AE_OK;
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}
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EXPORT_SYMBOL(acpi_evaluate_integer);
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int acpi_get_local_address(acpi_handle handle, u32 *addr)
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{
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unsigned long long adr;
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acpi_status status;
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status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
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if (ACPI_FAILURE(status))
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return -ENODATA;
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*addr = (u32)adr;
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return 0;
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}
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EXPORT_SYMBOL(acpi_get_local_address);
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#define ACPI_MAX_SUB_BUF_SIZE 9
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const char *acpi_get_subsystem_id(acpi_handle handle)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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const char *sub;
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size_t len;
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status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status);
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return ERR_PTR(-ENODATA);
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}
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obj = buffer.pointer;
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if (obj->type == ACPI_TYPE_STRING) {
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len = strlen(obj->string.pointer);
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if (len < ACPI_MAX_SUB_BUF_SIZE && len > 0) {
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sub = kstrdup(obj->string.pointer, GFP_KERNEL);
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if (!sub)
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sub = ERR_PTR(-ENOMEM);
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} else {
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acpi_handle_err(handle, "ACPI _SUB Length %zu is Invalid\n", len);
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sub = ERR_PTR(-ENODATA);
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}
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} else {
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acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n");
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sub = ERR_PTR(-ENODATA);
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}
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acpi_os_free(buffer.pointer);
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return sub;
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}
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EXPORT_SYMBOL_GPL(acpi_get_subsystem_id);
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acpi_status
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acpi_evaluate_reference(acpi_handle handle,
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acpi_string pathname,
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struct acpi_object_list *arguments,
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struct acpi_handle_list *list)
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{
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acpi_status status = AE_OK;
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union acpi_object *package = NULL;
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union acpi_object *element = NULL;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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u32 i = 0;
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if (!list)
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return AE_BAD_PARAMETER;
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/* Evaluate object. */
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status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
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if (ACPI_FAILURE(status))
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goto end;
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package = buffer.pointer;
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if ((buffer.length == 0) || !package) {
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status = AE_BAD_DATA;
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acpi_util_eval_error(handle, pathname, status);
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goto end;
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}
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if (package->type != ACPI_TYPE_PACKAGE) {
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status = AE_BAD_DATA;
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acpi_util_eval_error(handle, pathname, status);
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goto end;
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}
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if (!package->package.count) {
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status = AE_BAD_DATA;
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acpi_util_eval_error(handle, pathname, status);
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goto end;
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}
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list->handles = kcalloc(package->package.count, sizeof(*list->handles), GFP_KERNEL);
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if (!list->handles) {
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kfree(package);
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return AE_NO_MEMORY;
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}
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list->count = package->package.count;
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/* Extract package data. */
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for (i = 0; i < list->count; i++) {
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element = &(package->package.elements[i]);
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if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
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status = AE_BAD_DATA;
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acpi_util_eval_error(handle, pathname, status);
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break;
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}
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if (!element->reference.handle) {
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status = AE_NULL_ENTRY;
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acpi_util_eval_error(handle, pathname, status);
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break;
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}
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/* Get the acpi_handle. */
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list->handles[i] = element->reference.handle;
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acpi_handle_debug(list->handles[i], "Found in reference list\n");
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}
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if (ACPI_FAILURE(status)) {
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list->count = 0;
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kfree(list->handles);
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list->handles = NULL;
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}
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end:
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kfree(buffer.pointer);
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return status;
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}
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EXPORT_SYMBOL(acpi_evaluate_reference);
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/**
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* acpi_handle_list_equal - Check if two ACPI handle lists are the same
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* @list1: First list to compare.
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* @list2: Second list to compare.
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*
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* Return true if the given ACPI handle lists are of the same size and
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* contain the same ACPI handles in the same order. Otherwise, return false.
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*/
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bool acpi_handle_list_equal(struct acpi_handle_list *list1,
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struct acpi_handle_list *list2)
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{
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return list1->count == list2->count &&
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!memcmp(list1->handles, list2->handles,
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list1->count * sizeof(acpi_handle));
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}
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EXPORT_SYMBOL_GPL(acpi_handle_list_equal);
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/**
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* acpi_handle_list_replace - Replace one ACPI handle list with another
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* @dst: ACPI handle list to replace.
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* @src: Source ACPI handle list.
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*
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* Free the handles table in @dst, move the handles table from @src to @dst,
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* copy count from @src to @dst and clear @src.
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*/
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void acpi_handle_list_replace(struct acpi_handle_list *dst,
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struct acpi_handle_list *src)
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{
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if (dst->count)
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kfree(dst->handles);
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dst->count = src->count;
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dst->handles = src->handles;
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src->handles = NULL;
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src->count = 0;
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}
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EXPORT_SYMBOL_GPL(acpi_handle_list_replace);
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/**
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* acpi_handle_list_free - Free the handles table in an ACPI handle list
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* @list: ACPI handle list to free.
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*
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* Free the handles table in @list and clear its count field.
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*/
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void acpi_handle_list_free(struct acpi_handle_list *list)
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{
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if (!list->count)
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return;
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kfree(list->handles);
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list->count = 0;
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}
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EXPORT_SYMBOL_GPL(acpi_handle_list_free);
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|
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acpi_status
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acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
|
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{
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acpi_status status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *output;
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|
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status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer);
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|
|
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if (ACPI_FAILURE(status))
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return status;
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|
|
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output = buffer.pointer;
|
|
|
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if (!output || output->type != ACPI_TYPE_PACKAGE
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|| !output->package.count
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|| output->package.elements[0].type != ACPI_TYPE_BUFFER
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|| output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) {
|
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status = AE_TYPE;
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goto out;
|
|
}
|
|
|
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status = acpi_decode_pld_buffer(
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output->package.elements[0].buffer.pointer,
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output->package.elements[0].buffer.length,
|
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pld);
|
|
|
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out:
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kfree(buffer.pointer);
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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
|
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* @status_buf: optional detailed information (NULL if none)
|
|
*
|
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* Evaluate _OST for hotplug operations. All ACPI hotplug handlers
|
|
* must call this function when evaluating _OST for hotplug operations.
|
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* When the platform does not support _OST, this function has no effect.
|
|
*/
|
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acpi_status
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acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
|
|
struct acpi_buffer *status_buf)
|
|
{
|
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union acpi_object params[3] = {
|
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{.type = ACPI_TYPE_INTEGER,},
|
|
{.type = ACPI_TYPE_INTEGER,},
|
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{.type = ACPI_TYPE_BUFFER,}
|
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};
|
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struct acpi_object_list arg_list = {3, params};
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|
|
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params[0].integer.value = source_event;
|
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params[1].integer.value = status_code;
|
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if (status_buf != NULL) {
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params[2].buffer.pointer = status_buf->pointer;
|
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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;
|
|
}
|
|
|
|
/**
|
|
* acpi_handle_printk: Print message with ACPI prefix and object path
|
|
* @level: log level
|
|
* @handle: ACPI device handle
|
|
* @fmt: format string
|
|
*
|
|
* This function is called through acpi_handle_<level> macros and prints
|
|
* a message with ACPI prefix and object path. This function acquires
|
|
* the global namespace mutex to obtain an object path. In interrupt
|
|
* context, it shows the object path as <n/a>.
|
|
*/
|
|
void
|
|
acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
const char *path;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
path = acpi_handle_path(handle);
|
|
printk("%sACPI: %s: %pV", level, path ? path : "<n/a>", &vaf);
|
|
|
|
va_end(args);
|
|
kfree(path);
|
|
}
|
|
EXPORT_SYMBOL(acpi_handle_printk);
|
|
|
|
#if defined(CONFIG_DYNAMIC_DEBUG)
|
|
/**
|
|
* __acpi_handle_debug: pr_debug with ACPI prefix and object path
|
|
* @descriptor: Dynamic Debug descriptor
|
|
* @handle: ACPI device handle
|
|
* @fmt: format string
|
|
*
|
|
* This function is called through acpi_handle_debug macro and debug
|
|
* prints a message with ACPI prefix and object path. This function
|
|
* acquires the global namespace mutex to obtain an object path. In
|
|
* interrupt context, it shows the object path as <n/a>.
|
|
*/
|
|
void
|
|
__acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle,
|
|
const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
const char *path;
|
|
|
|
va_start(args, fmt);
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
path = acpi_handle_path(handle);
|
|
__dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf);
|
|
|
|
va_end(args);
|
|
kfree(path);
|
|
}
|
|
EXPORT_SYMBOL(__acpi_handle_debug);
|
|
#endif
|
|
|
|
/**
|
|
* acpi_evaluation_failure_warn - Log evaluation failure warning.
|
|
* @handle: Parent object handle.
|
|
* @name: Name of the object whose evaluation has failed.
|
|
* @status: Status value returned by the failing object evaluation.
|
|
*/
|
|
void acpi_evaluation_failure_warn(acpi_handle handle, const char *name,
|
|
acpi_status status)
|
|
{
|
|
acpi_handle_warn(handle, "%s evaluation failed: %s\n", name,
|
|
acpi_format_exception(status));
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_evaluation_failure_warn);
|
|
|
|
/**
|
|
* acpi_has_method: Check whether @handle has a method named @name
|
|
* @handle: ACPI device handle
|
|
* @name: name of object or method
|
|
*
|
|
* Check whether @handle has a method named @name.
|
|
*/
|
|
bool acpi_has_method(acpi_handle handle, char *name)
|
|
{
|
|
acpi_handle tmp;
|
|
|
|
return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp));
|
|
}
|
|
EXPORT_SYMBOL(acpi_has_method);
|
|
|
|
acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
|
|
u64 arg)
|
|
{
|
|
union acpi_object obj = { .type = ACPI_TYPE_INTEGER };
|
|
struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, };
|
|
|
|
obj.integer.value = arg;
|
|
|
|
return acpi_evaluate_object(handle, method, &arg_list, NULL);
|
|
}
|
|
EXPORT_SYMBOL(acpi_execute_simple_method);
|
|
|
|
/**
|
|
* acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations
|
|
* @handle: ACPI device handle
|
|
*
|
|
* Evaluate device's _EJ0 method for hotplug operations.
|
|
*/
|
|
acpi_status acpi_evaluate_ej0(acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_execute_simple_method(handle, "_EJ0", 1);
|
|
if (status == AE_NOT_FOUND)
|
|
acpi_handle_warn(handle, "No _EJ0 support for device\n");
|
|
else if (ACPI_FAILURE(status))
|
|
acpi_handle_warn(handle, "Eject failed (0x%x)\n", status);
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device
|
|
* @handle: ACPI device handle
|
|
* @lock: lock device if non-zero, otherwise unlock device
|
|
*
|
|
* Evaluate device's _LCK method if present to lock/unlock device
|
|
*/
|
|
acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
|
|
{
|
|
acpi_status status;
|
|
|
|
status = acpi_execute_simple_method(handle, "_LCK", !!lock);
|
|
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
|
|
if (lock)
|
|
acpi_handle_warn(handle,
|
|
"Locking device failed (0x%x)\n", status);
|
|
else
|
|
acpi_handle_warn(handle,
|
|
"Unlocking device failed (0x%x)\n", status);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence
|
|
* @handle: ACPI device handle
|
|
* @space_id: ACPI address space id to register OpRegion presence for
|
|
* @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or
|
|
* ACPI_REG_DISCONNECT
|
|
*
|
|
* Evaluate device's _REG method to register OpRegion presence.
|
|
*/
|
|
acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function)
|
|
{
|
|
struct acpi_object_list arg_list;
|
|
union acpi_object params[2];
|
|
|
|
params[0].type = ACPI_TYPE_INTEGER;
|
|
params[0].integer.value = space_id;
|
|
params[1].type = ACPI_TYPE_INTEGER;
|
|
params[1].integer.value = function;
|
|
arg_list.count = 2;
|
|
arg_list.pointer = params;
|
|
|
|
return acpi_evaluate_object(handle, "_REG", &arg_list, NULL);
|
|
}
|
|
EXPORT_SYMBOL(acpi_evaluate_reg);
|
|
|
|
/**
|
|
* acpi_evaluate_dsm - evaluate device's _DSM method
|
|
* @handle: ACPI device handle
|
|
* @guid: GUID of requested functions, should be 16 bytes
|
|
* @rev: revision number of requested function
|
|
* @func: requested function number
|
|
* @argv4: the function specific parameter
|
|
*
|
|
* Evaluate device's _DSM method with specified GUID, revision id and
|
|
* function number. Caller needs to free the returned object.
|
|
*
|
|
* Though ACPI defines the fourth parameter for _DSM should be a package,
|
|
* some old BIOSes do expect a buffer or an integer etc.
|
|
*/
|
|
union acpi_object *
|
|
acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 func,
|
|
union acpi_object *argv4)
|
|
{
|
|
acpi_status ret;
|
|
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object params[4];
|
|
struct acpi_object_list input = {
|
|
.count = 4,
|
|
.pointer = params,
|
|
};
|
|
|
|
params[0].type = ACPI_TYPE_BUFFER;
|
|
params[0].buffer.length = 16;
|
|
params[0].buffer.pointer = (u8 *)guid;
|
|
params[1].type = ACPI_TYPE_INTEGER;
|
|
params[1].integer.value = rev;
|
|
params[2].type = ACPI_TYPE_INTEGER;
|
|
params[2].integer.value = func;
|
|
if (argv4) {
|
|
params[3] = *argv4;
|
|
} else {
|
|
params[3].type = ACPI_TYPE_PACKAGE;
|
|
params[3].package.count = 0;
|
|
params[3].package.elements = NULL;
|
|
}
|
|
|
|
ret = acpi_evaluate_object(handle, "_DSM", &input, &buf);
|
|
if (ACPI_SUCCESS(ret))
|
|
return (union acpi_object *)buf.pointer;
|
|
|
|
if (ret != AE_NOT_FOUND)
|
|
acpi_handle_warn(handle,
|
|
"failed to evaluate _DSM %pUb (0x%x)\n", guid, ret);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(acpi_evaluate_dsm);
|
|
|
|
/**
|
|
* acpi_check_dsm - check if _DSM method supports requested functions.
|
|
* @handle: ACPI device handle
|
|
* @guid: GUID of requested functions, should be 16 bytes at least
|
|
* @rev: revision number of requested functions
|
|
* @funcs: bitmap of requested functions
|
|
*
|
|
* Evaluate device's _DSM method to check whether it supports requested
|
|
* functions. Currently only support 64 functions at maximum, should be
|
|
* enough for now.
|
|
*/
|
|
bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs)
|
|
{
|
|
int i;
|
|
u64 mask = 0;
|
|
union acpi_object *obj;
|
|
|
|
if (funcs == 0)
|
|
return false;
|
|
|
|
obj = acpi_evaluate_dsm(handle, guid, rev, 0, NULL);
|
|
if (!obj)
|
|
return false;
|
|
|
|
/* For compatibility, old BIOSes may return an integer */
|
|
if (obj->type == ACPI_TYPE_INTEGER)
|
|
mask = obj->integer.value;
|
|
else if (obj->type == ACPI_TYPE_BUFFER)
|
|
for (i = 0; i < obj->buffer.length && i < 8; i++)
|
|
mask |= (((u64)obj->buffer.pointer[i]) << (i * 8));
|
|
ACPI_FREE(obj);
|
|
|
|
/*
|
|
* Bit 0 indicates whether there's support for any functions other than
|
|
* function 0 for the specified GUID and revision.
|
|
*/
|
|
if ((mask & 0x1) && (mask & funcs) == funcs)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(acpi_check_dsm);
|
|
|
|
/**
|
|
* acpi_dev_uid_match - Match device by supplied UID
|
|
* @adev: ACPI device to match.
|
|
* @uid2: Unique ID of the device.
|
|
*
|
|
* Matches UID in @adev with given @uid2.
|
|
*
|
|
* Returns:
|
|
* - %true if matches.
|
|
* - %false otherwise.
|
|
*/
|
|
bool acpi_dev_uid_match(struct acpi_device *adev, const char *uid2)
|
|
{
|
|
const char *uid1 = acpi_device_uid(adev);
|
|
|
|
return uid1 && uid2 && !strcmp(uid1, uid2);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_uid_match);
|
|
|
|
/**
|
|
* acpi_dev_hid_uid_match - Match device by supplied HID and UID
|
|
* @adev: ACPI device to match.
|
|
* @hid2: Hardware ID of the device.
|
|
* @uid2: Unique ID of the device, pass NULL to not check _UID.
|
|
*
|
|
* Matches HID and UID in @adev with given @hid2 and @uid2. Absence of @uid2
|
|
* will be treated as a match. If user wants to validate @uid2, it should be
|
|
* done before calling this function.
|
|
*
|
|
* Returns:
|
|
* - %true if matches or @uid2 is NULL.
|
|
* - %false otherwise.
|
|
*/
|
|
bool acpi_dev_hid_uid_match(struct acpi_device *adev,
|
|
const char *hid2, const char *uid2)
|
|
{
|
|
const char *hid1 = acpi_device_hid(adev);
|
|
|
|
if (strcmp(hid1, hid2))
|
|
return false;
|
|
|
|
if (!uid2)
|
|
return true;
|
|
|
|
return acpi_dev_uid_match(adev, uid2);
|
|
}
|
|
EXPORT_SYMBOL(acpi_dev_hid_uid_match);
|
|
|
|
/**
|
|
* acpi_dev_uid_to_integer - treat ACPI device _UID as integer
|
|
* @adev: ACPI device to get _UID from
|
|
* @integer: output buffer for integer
|
|
*
|
|
* Considers _UID as integer and converts it to @integer.
|
|
*
|
|
* Returns 0 on success, or negative error code otherwise.
|
|
*/
|
|
int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer)
|
|
{
|
|
const char *uid;
|
|
|
|
if (!adev)
|
|
return -ENODEV;
|
|
|
|
uid = acpi_device_uid(adev);
|
|
if (!uid)
|
|
return -ENODATA;
|
|
|
|
return kstrtou64(uid, 0, integer);
|
|
}
|
|
EXPORT_SYMBOL(acpi_dev_uid_to_integer);
|
|
|
|
/**
|
|
* acpi_dev_found - Detect presence of a given ACPI device in the namespace.
|
|
* @hid: Hardware ID of the device.
|
|
*
|
|
* Return %true if the device was present at the moment of invocation.
|
|
* Note that if the device is pluggable, it may since have disappeared.
|
|
*
|
|
* For this function to work, acpi_bus_scan() must have been executed
|
|
* which happens in the subsys_initcall() subsection. Hence, do not
|
|
* call from a subsys_initcall() or earlier (use acpi_get_devices()
|
|
* instead). Calling from module_init() is fine (which is synonymous
|
|
* with device_initcall()).
|
|
*/
|
|
bool acpi_dev_found(const char *hid)
|
|
{
|
|
struct acpi_device_bus_id *acpi_device_bus_id;
|
|
bool found = false;
|
|
|
|
mutex_lock(&acpi_device_lock);
|
|
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
|
|
if (!strcmp(acpi_device_bus_id->bus_id, hid)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
mutex_unlock(&acpi_device_lock);
|
|
|
|
return found;
|
|
}
|
|
EXPORT_SYMBOL(acpi_dev_found);
|
|
|
|
struct acpi_dev_match_info {
|
|
struct acpi_device_id hid[2];
|
|
const char *uid;
|
|
s64 hrv;
|
|
};
|
|
|
|
static int acpi_dev_match_cb(struct device *dev, const void *data)
|
|
{
|
|
struct acpi_device *adev = to_acpi_device(dev);
|
|
const struct acpi_dev_match_info *match = data;
|
|
unsigned long long hrv;
|
|
acpi_status status;
|
|
|
|
if (acpi_match_device_ids(adev, match->hid))
|
|
return 0;
|
|
|
|
if (match->uid && !acpi_dev_uid_match(adev, match->uid))
|
|
return 0;
|
|
|
|
if (match->hrv == -1)
|
|
return 1;
|
|
|
|
status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv);
|
|
if (ACPI_FAILURE(status))
|
|
return 0;
|
|
|
|
return hrv == match->hrv;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_present - Detect that a given ACPI device is present
|
|
* @hid: Hardware ID of the device.
|
|
* @uid: Unique ID of the device, pass NULL to not check _UID
|
|
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
|
|
*
|
|
* Return %true if a matching device was present at the moment of invocation.
|
|
* Note that if the device is pluggable, it may since have disappeared.
|
|
*
|
|
* Note that unlike acpi_dev_found() this function checks the status
|
|
* of the device. So for devices which are present in the DSDT, but
|
|
* which are disabled (their _STA callback returns 0) this function
|
|
* will return false.
|
|
*
|
|
* For this function to work, acpi_bus_scan() must have been executed
|
|
* which happens in the subsys_initcall() subsection. Hence, do not
|
|
* call from a subsys_initcall() or earlier (use acpi_get_devices()
|
|
* instead). Calling from module_init() is fine (which is synonymous
|
|
* with device_initcall()).
|
|
*/
|
|
bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
|
|
{
|
|
struct acpi_dev_match_info match = {};
|
|
struct device *dev;
|
|
|
|
strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
|
|
match.uid = uid;
|
|
match.hrv = hrv;
|
|
|
|
dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
|
|
put_device(dev);
|
|
return !!dev;
|
|
}
|
|
EXPORT_SYMBOL(acpi_dev_present);
|
|
|
|
/**
|
|
* acpi_dev_get_next_match_dev - Return the next match of ACPI device
|
|
* @adev: Pointer to the previous ACPI device matching this @hid, @uid and @hrv
|
|
* @hid: Hardware ID of the device.
|
|
* @uid: Unique ID of the device, pass NULL to not check _UID
|
|
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
|
|
*
|
|
* Return the next match of ACPI device if another matching device was present
|
|
* at the moment of invocation, or NULL otherwise.
|
|
*
|
|
* The caller is responsible for invoking acpi_dev_put() on the returned device.
|
|
* On the other hand the function invokes acpi_dev_put() on the given @adev
|
|
* assuming that its reference counter had been increased beforehand.
|
|
*
|
|
* See additional information in acpi_dev_present() as well.
|
|
*/
|
|
struct acpi_device *
|
|
acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv)
|
|
{
|
|
struct device *start = adev ? &adev->dev : NULL;
|
|
struct acpi_dev_match_info match = {};
|
|
struct device *dev;
|
|
|
|
strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
|
|
match.uid = uid;
|
|
match.hrv = hrv;
|
|
|
|
dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb);
|
|
acpi_dev_put(adev);
|
|
return dev ? to_acpi_device(dev) : NULL;
|
|
}
|
|
EXPORT_SYMBOL(acpi_dev_get_next_match_dev);
|
|
|
|
/**
|
|
* acpi_dev_get_first_match_dev - Return the first match of ACPI device
|
|
* @hid: Hardware ID of the device.
|
|
* @uid: Unique ID of the device, pass NULL to not check _UID
|
|
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
|
|
*
|
|
* Return the first match of ACPI device if a matching device was present
|
|
* at the moment of invocation, or NULL otherwise.
|
|
*
|
|
* The caller is responsible for invoking acpi_dev_put() on the returned device.
|
|
*
|
|
* See additional information in acpi_dev_present() as well.
|
|
*/
|
|
struct acpi_device *
|
|
acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
|
|
{
|
|
return acpi_dev_get_next_match_dev(NULL, hid, uid, hrv);
|
|
}
|
|
EXPORT_SYMBOL(acpi_dev_get_first_match_dev);
|
|
|
|
/**
|
|
* acpi_reduced_hardware - Return if this is an ACPI-reduced-hw machine
|
|
*
|
|
* Return true when running on an ACPI-reduced-hw machine, false otherwise.
|
|
*/
|
|
bool acpi_reduced_hardware(void)
|
|
{
|
|
return acpi_gbl_reduced_hardware;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_reduced_hardware);
|
|
|
|
/*
|
|
* acpi_backlight= handling, this is done here rather then in video_detect.c
|
|
* because __setup cannot be used in modules.
|
|
*/
|
|
char acpi_video_backlight_string[16];
|
|
EXPORT_SYMBOL(acpi_video_backlight_string);
|
|
|
|
static int __init acpi_backlight(char *str)
|
|
{
|
|
strscpy(acpi_video_backlight_string, str,
|
|
sizeof(acpi_video_backlight_string));
|
|
return 1;
|
|
}
|
|
__setup("acpi_backlight=", acpi_backlight);
|
|
|
|
/**
|
|
* acpi_match_platform_list - Check if the system matches with a given list
|
|
* @plat: pointer to acpi_platform_list table terminated by a NULL entry
|
|
*
|
|
* Return the matched index if the system is found in the platform list.
|
|
* Otherwise, return a negative error code.
|
|
*/
|
|
int acpi_match_platform_list(const struct acpi_platform_list *plat)
|
|
{
|
|
struct acpi_table_header hdr;
|
|
int idx = 0;
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
|
|
for (; plat->oem_id[0]; plat++, idx++) {
|
|
if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr)))
|
|
continue;
|
|
|
|
if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE))
|
|
continue;
|
|
|
|
if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE))
|
|
continue;
|
|
|
|
if ((plat->pred == all_versions) ||
|
|
(plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) ||
|
|
(plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) ||
|
|
(plat->pred == equal && hdr.oem_revision == plat->oem_revision))
|
|
return idx;
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL(acpi_match_platform_list);
|