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linux/include/acpi/acobject.h
Alexey Starikovskiy c0d127b569 ACPICA: fix AML mutex re-entrancy 
ACPI AML supports "serialized" methods which are protected
by an implicit mutex.  The mutex is re-entrant for that AML thread
to allow recursion.

However, Linux implements notify() by creating a new AML thread.
So for systems where notify() re-enters a serialized method,
deadlock results.

The fix is to use the Linux thread_id as the key to allowing
re-entrancy, not the AML thread pointer.

http://bugzilla.kernel.org/show_bug.cgi?id=5534

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2007-02-15 16:13:16 -05:00

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/******************************************************************************
*
* Name: acobject.h - Definition of union acpi_operand_object (Internal object only)
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2007, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#ifndef _ACOBJECT_H
#define _ACOBJECT_H
/* acpisrc:struct_defs -- for acpisrc conversion */
/*
* The union acpi_operand_object is used to pass AML operands from the dispatcher
* to the interpreter, and to keep track of the various handlers such as
* address space handlers and notify handlers. The object is a constant
* size in order to allow it to be cached and reused.
*
* Note: The object is optimized to be aligned and will not work if it is
* byte-packed.
*/
#if ACPI_MACHINE_WIDTH == 64
#pragma pack(8)
#else
#pragma pack(4)
#endif
/*******************************************************************************
*
* Common Descriptors
*
******************************************************************************/
/*
* Common area for all objects.
*
* descriptor_type is used to differentiate between internal descriptors, and
* must be in the same place across all descriptors
*
* Note: The descriptor_type and Type fields must appear in the identical
* position in both the struct acpi_namespace_node and union acpi_operand_object
* structures.
*/
#define ACPI_OBJECT_COMMON_HEADER \
union acpi_operand_object *next_object; /* Objects linked to parent NS node */\
u8 descriptor_type; /* To differentiate various internal objs */\
u8 type; /* acpi_object_type */\
u16 reference_count; /* For object deletion management */\
u8 flags;
/*
* Note: There are 3 bytes available here before the
* next natural alignment boundary (for both 32/64 cases)
*/
/* Values for Flag byte above */
#define AOPOBJ_AML_CONSTANT 0x01
#define AOPOBJ_STATIC_POINTER 0x02
#define AOPOBJ_DATA_VALID 0x04
#define AOPOBJ_OBJECT_INITIALIZED 0x08
#define AOPOBJ_SETUP_COMPLETE 0x10
#define AOPOBJ_SINGLE_DATUM 0x20
#define AOPOBJ_INVALID 0x40 /* Used if host OS won't allow an op_region address */
/******************************************************************************
*
* Basic data types
*
*****************************************************************************/
struct acpi_object_common {
ACPI_OBJECT_COMMON_HEADER};
struct acpi_object_integer {
ACPI_OBJECT_COMMON_HEADER u8 fill[3]; /* Prevent warning on some compilers */
acpi_integer value;
};
/*
* Note: The String and Buffer object must be identical through the Pointer
* and length elements. There is code that depends on this.
*
* Fields common to both Strings and Buffers
*/
#define ACPI_COMMON_BUFFER_INFO(_type) \
_type *pointer; \
u32 length;
struct acpi_object_string { /* Null terminated, ASCII characters only */
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_BUFFER_INFO(char) /* String in AML stream or allocated string */
};
struct acpi_object_buffer {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_BUFFER_INFO(u8) /* Buffer in AML stream or allocated buffer */
u32 aml_length;
u8 *aml_start;
struct acpi_namespace_node *node; /* Link back to parent node */
};
struct acpi_object_package {
ACPI_OBJECT_COMMON_HEADER struct acpi_namespace_node *node; /* Link back to parent node */
union acpi_operand_object **elements; /* Array of pointers to acpi_objects */
u8 *aml_start;
u32 aml_length;
u32 count; /* # of elements in package */
};
/******************************************************************************
*
* Complex data types
*
*****************************************************************************/
struct acpi_object_event {
ACPI_OBJECT_COMMON_HEADER acpi_semaphore os_semaphore; /* Actual OS synchronization object */
};
struct acpi_object_mutex {
ACPI_OBJECT_COMMON_HEADER u8 sync_level; /* 0-15, specified in Mutex() call */
u16 acquisition_depth; /* Allow multiple Acquires, same thread */
acpi_thread_id owner_thread_id; /* Current owner of the mutex */
acpi_mutex os_mutex; /* Actual OS synchronization object */
union acpi_operand_object *prev; /* Link for list of acquired mutexes */
union acpi_operand_object *next; /* Link for list of acquired mutexes */
struct acpi_namespace_node *node; /* Containing namespace node */
u8 original_sync_level; /* Owner's original sync level (0-15) */
};
struct acpi_object_region {
ACPI_OBJECT_COMMON_HEADER u8 space_id;
struct acpi_namespace_node *node; /* Containing namespace node */
union acpi_operand_object *handler; /* Handler for region access */
union acpi_operand_object *next;
acpi_physical_address address;
u32 length;
};
struct acpi_object_method {
ACPI_OBJECT_COMMON_HEADER u8 method_flags;
u8 param_count;
u8 sync_level;
union acpi_operand_object *mutex;
u8 *aml_start;
ACPI_INTERNAL_METHOD implementation;
u32 aml_length;
u8 thread_count;
acpi_owner_id owner_id;
};
/******************************************************************************
*
* Objects that can be notified. All share a common notify_info area.
*
*****************************************************************************/
/*
* Common fields for objects that support ASL notifications
*/
#define ACPI_COMMON_NOTIFY_INFO \
union acpi_operand_object *system_notify; /* Handler for system notifies */\
union acpi_operand_object *device_notify; /* Handler for driver notifies */\
union acpi_operand_object *handler; /* Handler for Address space */
struct acpi_object_notify_common { /* COMMON NOTIFY for POWER, PROCESSOR, DEVICE, and THERMAL */
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_NOTIFY_INFO};
struct acpi_object_device {
ACPI_OBJECT_COMMON_HEADER
ACPI_COMMON_NOTIFY_INFO struct acpi_gpe_block_info *gpe_block;
};
struct acpi_object_power_resource {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_NOTIFY_INFO u32 system_level;
u32 resource_order;
};
struct acpi_object_processor {
ACPI_OBJECT_COMMON_HEADER
/* The next two fields take advantage of the 3-byte space before NOTIFY_INFO */
u8 proc_id;
u8 length;
ACPI_COMMON_NOTIFY_INFO acpi_io_address address;
};
struct acpi_object_thermal_zone {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_NOTIFY_INFO};
/******************************************************************************
*
* Fields. All share a common header/info field.
*
*****************************************************************************/
/*
* Common bitfield for the field objects
* "Field Datum" -- a datum from the actual field object
* "Buffer Datum" -- a datum from a user buffer, read from or to be written to the field
*/
#define ACPI_COMMON_FIELD_INFO \
u8 field_flags; /* Access, update, and lock bits */\
u8 attribute; /* From access_as keyword */\
u8 access_byte_width; /* Read/Write size in bytes */\
struct acpi_namespace_node *node; /* Link back to parent node */\
u32 bit_length; /* Length of field in bits */\
u32 base_byte_offset; /* Byte offset within containing object */\
u32 value; /* Value to store into the Bank or Index register */\
u8 start_field_bit_offset;/* Bit offset within first field datum (0-63) */\
u8 access_bit_width; /* Read/Write size in bits (8-64) */
struct acpi_object_field_common { /* COMMON FIELD (for BUFFER, REGION, BANK, and INDEX fields) */
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_FIELD_INFO union acpi_operand_object *region_obj; /* Parent Operation Region object (REGION/BANK fields only) */
};
struct acpi_object_region_field {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_FIELD_INFO union acpi_operand_object *region_obj; /* Containing op_region object */
};
struct acpi_object_bank_field {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_FIELD_INFO union acpi_operand_object *region_obj; /* Containing op_region object */
union acpi_operand_object *bank_obj; /* bank_select Register object */
};
struct acpi_object_index_field {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_FIELD_INFO
/*
* No "RegionObj" pointer needed since the Index and Data registers
* are each field definitions unto themselves.
*/
union acpi_operand_object *index_obj; /* Index register */
union acpi_operand_object *data_obj; /* Data register */
};
/* The buffer_field is different in that it is part of a Buffer, not an op_region */
struct acpi_object_buffer_field {
ACPI_OBJECT_COMMON_HEADER ACPI_COMMON_FIELD_INFO union acpi_operand_object *buffer_obj; /* Containing Buffer object */
};
/******************************************************************************
*
* Objects for handlers
*
*****************************************************************************/
struct acpi_object_notify_handler {
ACPI_OBJECT_COMMON_HEADER struct acpi_namespace_node *node; /* Parent device */
acpi_notify_handler handler;
void *context;
};
struct acpi_object_addr_handler {
ACPI_OBJECT_COMMON_HEADER u8 space_id;
u8 handler_flags;
acpi_adr_space_handler handler;
struct acpi_namespace_node *node; /* Parent device */
void *context;
acpi_adr_space_setup setup;
union acpi_operand_object *region_list; /* regions using this handler */
union acpi_operand_object *next;
};
/* Flags for address handler (handler_flags) */
#define ACPI_ADDR_HANDLER_DEFAULT_INSTALLED 0x01
/******************************************************************************
*
* Special internal objects
*
*****************************************************************************/
/*
* The Reference object type is used for these opcodes:
* Arg[0-6], Local[0-7], index_op, name_op, zero_op, one_op, ones_op, debug_op
*/
struct acpi_object_reference {
ACPI_OBJECT_COMMON_HEADER u8 target_type; /* Used for index_op */
u16 opcode;
void *object; /* name_op=>HANDLE to obj, index_op=>union acpi_operand_object */
struct acpi_namespace_node *node;
union acpi_operand_object **where;
u32 offset; /* Used for arg_op, local_op, and index_op */
};
/*
* Extra object is used as additional storage for types that
* have AML code in their declarations (term_args) that must be
* evaluated at run time.
*
* Currently: Region and field_unit types
*/
struct acpi_object_extra {
ACPI_OBJECT_COMMON_HEADER struct acpi_namespace_node *method_REG; /* _REG method for this region (if any) */
void *region_context; /* Region-specific data */
u8 *aml_start;
u32 aml_length;
};
/* Additional data that can be attached to namespace nodes */
struct acpi_object_data {
ACPI_OBJECT_COMMON_HEADER acpi_object_handler handler;
void *pointer;
};
/* Structure used when objects are cached for reuse */
struct acpi_object_cache_list {
ACPI_OBJECT_COMMON_HEADER union acpi_operand_object *next; /* Link for object cache and internal lists */
};
/******************************************************************************
*
* union acpi_operand_object Descriptor - a giant union of all of the above
*
*****************************************************************************/
union acpi_operand_object {
struct acpi_object_common common;
struct acpi_object_integer integer;
struct acpi_object_string string;
struct acpi_object_buffer buffer;
struct acpi_object_package package;
struct acpi_object_event event;
struct acpi_object_method method;
struct acpi_object_mutex mutex;
struct acpi_object_region region;
struct acpi_object_notify_common common_notify;
struct acpi_object_device device;
struct acpi_object_power_resource power_resource;
struct acpi_object_processor processor;
struct acpi_object_thermal_zone thermal_zone;
struct acpi_object_field_common common_field;
struct acpi_object_region_field field;
struct acpi_object_buffer_field buffer_field;
struct acpi_object_bank_field bank_field;
struct acpi_object_index_field index_field;
struct acpi_object_notify_handler notify;
struct acpi_object_addr_handler address_space;
struct acpi_object_reference reference;
struct acpi_object_extra extra;
struct acpi_object_data data;
struct acpi_object_cache_list cache;
};
/******************************************************************************
*
* union acpi_descriptor - objects that share a common descriptor identifier
*
*****************************************************************************/
/* Object descriptor types */
#define ACPI_DESC_TYPE_CACHED 0x01 /* Used only when object is cached */
#define ACPI_DESC_TYPE_STATE 0x02
#define ACPI_DESC_TYPE_STATE_UPDATE 0x03
#define ACPI_DESC_TYPE_STATE_PACKAGE 0x04
#define ACPI_DESC_TYPE_STATE_CONTROL 0x05
#define ACPI_DESC_TYPE_STATE_RPSCOPE 0x06
#define ACPI_DESC_TYPE_STATE_PSCOPE 0x07
#define ACPI_DESC_TYPE_STATE_WSCOPE 0x08
#define ACPI_DESC_TYPE_STATE_RESULT 0x09
#define ACPI_DESC_TYPE_STATE_NOTIFY 0x0A
#define ACPI_DESC_TYPE_STATE_THREAD 0x0B
#define ACPI_DESC_TYPE_WALK 0x0C
#define ACPI_DESC_TYPE_PARSER 0x0D
#define ACPI_DESC_TYPE_OPERAND 0x0E
#define ACPI_DESC_TYPE_NAMED 0x0F
#define ACPI_DESC_TYPE_MAX 0x0F
struct acpi_common_descriptor {
void *common_pointer;
u8 descriptor_type; /* To differentiate various internal objs */
};
union acpi_descriptor {
struct acpi_common_descriptor common;
union acpi_operand_object object;
struct acpi_namespace_node node;
union acpi_parse_object op;
};
#pragma pack()
#endif /* _ACOBJECT_H */
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