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![Bjørn Mork](/assets/img/avatar_default.png)
Commit1a699476e2
("ACPI / hotplug / PCI: Hotplug notifications from acpi_bus_notify()") added debug messages for a few common events. These debug messages are unconditionally enabled if CONFIG_DYNAMIC_DEBUG is defined, contrary to the documented meaning, making the ACPI system spew lots of unwanted noise on any kernel with dynamic debugging. The bug was introduced by commitfbfddae696
("ACPI: Add acpi_handle_<level>() interfaces"), which added the CONFIG_DYNAMIC_DEBUG dependency without respecting its meaning. Fix by adding real support for dynamic_debug. Fixes:fbfddae696
("ACPI: Add acpi_handle_<level>() interfaces") Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
700 lines
18 KiB
C
700 lines
18 KiB
C
/*
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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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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#define _COMPONENT ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("utils");
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/* --------------------------------------------------------------------------
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Object Evaluation Helpers
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-------------------------------------------------------------------------- */
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static void
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acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
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{
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#ifdef ACPI_DEBUG_OUTPUT
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char prefix[80] = {'\0'};
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struct acpi_buffer buffer = {sizeof(prefix), prefix};
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acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
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(char *) prefix, p, acpi_format_exception(s)));
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#else
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return;
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#endif
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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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printk(KERN_WARNING PREFIX "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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printk(KERN_WARNING PREFIX "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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printk(KERN_WARNING PREFIX "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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printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
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" than exist in package [%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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printk(KERN_WARNING PREFIX "Invalid package element"
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" [%d]: got number, expecting"
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" [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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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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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 *) +
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(element->buffer.length * sizeof(u8));
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tail_offset += sizeof(u8 *);
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break;
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default:
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printk(KERN_WARNING PREFIX "Invalid package element"
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" [%d] got string/buffer,"
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" expecting [%c]\n",
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i, format_string[i]);
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return AE_BAD_DATA;
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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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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Found unsupported element at index=%d\n",
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i));
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/* TBD: handle nested packages... */
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return AE_SUPPORT;
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break;
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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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if (!element) {
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return AE_BAD_DATA;
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}
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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 * sizeof(u8);
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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_DEBUG_PRINT((ACPI_DB_INFO, "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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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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}
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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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printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
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(unsigned)buffer.length, 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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printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
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package->type);
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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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printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
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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 > ACPI_MAX_HANDLES) {
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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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printk(KERN_ERR PREFIX
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"Expecting a [Reference] package element, found type %X\n",
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element->type);
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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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printk(KERN_WARNING PREFIX "Invalid reference in"
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" package %s\n", pathname);
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status = AE_NULL_ENTRY;
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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_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
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list->handles[i]));
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}
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end:
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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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}
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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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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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status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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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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}
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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;
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}
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EXPORT_SYMBOL(acpi_get_physical_device_location);
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/**
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* acpi_evaluate_ost: Evaluate _OST for hotplug operations
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* @handle: ACPI device handle
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* @source_event: source event code
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* @status_code: status code
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* @status_buf: optional detailed information (NULL if none)
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*
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* Evaluate _OST for hotplug operations. All ACPI hotplug handlers
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* 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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*/
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acpi_status
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acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
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struct acpi_buffer *status_buf)
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{
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union acpi_object params[3] = {
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{.type = ACPI_TYPE_INTEGER,},
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{.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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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;
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} else {
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params[2].buffer.pointer = NULL;
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params[2].buffer.length = 0;
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}
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return acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
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}
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EXPORT_SYMBOL(acpi_evaluate_ost);
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/**
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* acpi_handle_path: Return the object path of handle
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*
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* Caller must free the returned buffer
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*/
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static char *acpi_handle_path(acpi_handle handle)
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{
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struct acpi_buffer buffer = {
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.length = ACPI_ALLOCATE_BUFFER,
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.pointer = NULL
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};
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if (in_interrupt() ||
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK)
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return NULL;
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return buffer.pointer;
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}
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/**
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* acpi_handle_printk: Print message with ACPI prefix and object path
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*
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* This function is called through acpi_handle_<level> macros and prints
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* a message with ACPI prefix and object path. This function acquires
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* the global namespace mutex to obtain an object path. In interrupt
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* context, it shows the object path as <n/a>.
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*/
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void
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acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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const char *path;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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path = acpi_handle_path(handle);
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printk("%sACPI: %s: %pV", level, path ? path : "<n/a>" , &vaf);
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va_end(args);
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kfree(path);
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}
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EXPORT_SYMBOL(acpi_handle_printk);
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#if defined(CONFIG_DYNAMIC_DEBUG)
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/**
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* __acpi_handle_debug: pr_debug with ACPI prefix and object path
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*
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* This function is called through acpi_handle_debug macro and debug
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* prints a message with ACPI prefix and object path. This function
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* acquires the global namespace mutex to obtain an object path. In
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* interrupt context, it shows the object path as <n/a>.
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*/
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void
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__acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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const char *path;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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path = acpi_handle_path(handle);
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__dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf);
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va_end(args);
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kfree(path);
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}
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EXPORT_SYMBOL(__acpi_handle_debug);
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#endif
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/**
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* acpi_has_method: Check whether @handle has a method named @name
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* @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_dsm - evaluate device's _DSM method
|
|
* @handle: ACPI device handle
|
|
* @uuid: UUID 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 UUID, 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 u8 *uuid, int rev, int 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 = (char *)uuid;
|
|
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 (0x%x)\n", ret);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(acpi_evaluate_dsm);
|
|
|
|
/**
|
|
* acpi_check_dsm - check if _DSM method supports requested functions.
|
|
* @handle: ACPI device handle
|
|
* @uuid: UUID of requested functions, should be 16 bytes at least
|
|
* @rev: revision number of requested functions
|
|
* @funcs: bitmap of requested functions
|
|
* @exclude: excluding special value, used to support i915 and nouveau
|
|
*
|
|
* 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 u8 *uuid, int rev, u64 funcs)
|
|
{
|
|
int i;
|
|
u64 mask = 0;
|
|
union acpi_object *obj;
|
|
|
|
if (funcs == 0)
|
|
return false;
|
|
|
|
obj = acpi_evaluate_dsm(handle, uuid, 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 |= (((u8)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 UUID and revision.
|
|
*/
|
|
if ((mask & 0x1) && (mask & funcs) == funcs)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(acpi_check_dsm);
|