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![Pavel Machek](/assets/img/avatar_default.png)
Now I know why I had strange "scheduling in atomic" problems: acpi_evaluate_integer() does malloc(..., irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL)... which is (of course) broken. There's no way to reliably tell if we need GFP_ATOMIC or not from code, this one for example fails to detect spinlocks held. Fortunately, allocation seems small enough to be done on stack. Signed-off-by: Pavel Machek <pavel@suse.cz> Acked-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
426 lines
10 KiB
C
426 lines
10 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/init.h>
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#include <linux/types.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.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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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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size_required += sizeof(acpi_integer);
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tail_offset += sizeof(acpi_integer);
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break;
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case 'S':
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size_required +=
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sizeof(char *) + sizeof(acpi_integer) +
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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, expecing"
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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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" expecing [%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 < 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 || !buffer->pointer) {
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return AE_BAD_PARAMETER;
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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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*((acpi_integer *) head) =
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element->integer.value;
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head += sizeof(acpi_integer);
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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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*((acpi_integer *) tail) =
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element->integer.value;
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head += sizeof(acpi_integer *);
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tail += sizeof(acpi_integer);
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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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#if 0
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acpi_status
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acpi_evaluate_string(acpi_handle handle,
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acpi_string pathname,
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acpi_object_list * arguments, acpi_string * data)
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{
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acpi_status status = AE_OK;
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acpi_object *element = NULL;
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acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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if (!data)
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return AE_BAD_PARAMETER;
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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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element = (acpi_object *) buffer.pointer;
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if ((element->type != ACPI_TYPE_STRING)
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|| (element->type != ACPI_TYPE_BUFFER)
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|| !element->string.length) {
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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 = kzalloc(element->string.length + 1, GFP_KERNEL);
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if (!data) {
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printk(KERN_ERR PREFIX "Memory allocation\n");
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return -ENOMEM;
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}
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memcpy(*data, element->string.pointer, element->string.length);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
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kfree(buffer.pointer);
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return AE_OK;
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}
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#endif
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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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