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linux/include/acpi/acpiosxf.h
Rafael J. Wysocki 7b98118aaa ACPI / hotplug: Consolidate deferred execution of ACPI hotplug routines 
There are two different interfaces for queuing up work items on the
ACPI hotplug workqueue, alloc_acpi_hp_work() used by PCI and PCI host
bridge hotplug code and acpi_os_hotplug_execute() used by the common
ACPI hotplug code and docking stations.  They both are somewhat
cumbersome to use and work slightly differently.

The users of alloc_acpi_hp_work() have to submit a work function that
will extract the necessary data items from a struct acpi_hp_work
object allocated by alloc_acpi_hp_work() and then will free that
object, while it would be more straightforward to simply use a work
function with one more argument and let the interface take care of
the execution details.

The users of acpi_os_hotplug_execute() also have to deal with the
fact that it takes only one argument in addition to the work function
pointer, although acpi_os_execute_deferred() actually takes care of
the allocation and freeing of memory, so it would have been able to
pass more arguments to the work function if it hadn't been
constrained by the connection with acpi_os_execute().

Moreover, while alloc_acpi_hp_work() makes GFP_KERNEL memory
allocations, which is correct, because hotplug work items are
always queued up from process context, acpi_os_hotplug_execute()
uses GFP_ATOMIC, as that is needed by acpi_os_execute().  Also,
acpi_os_execute_deferred() queued up by it waits for the ACPI event
workqueues to flush before executing the work function, whereas
alloc_acpi_hp_work() can't do anything similar.  That leads to
somewhat arbitrary differences in behavior between various ACPI
hotplug code paths and has to be straightened up.

For this reason, replace both alloc_acpi_hp_work() and
acpi_os_hotplug_execute() with a single interface,
acpi_hotplug_execute(), combining their behavior and being more
friendly to its users than any of the two.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
2013-11-07 19:28:48 +01:00

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/******************************************************************************
*
* Name: acpiosxf.h - All interfaces to the OS Services Layer (OSL). These
* interfaces must be implemented by OSL to interface the
* ACPI components to the host operating system.
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2013, Intel Corp.
* 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 __ACPIOSXF_H__
#define __ACPIOSXF_H__
#include <acpi/platform/acenv.h>
#include <acpi/actypes.h>
/* Types for acpi_os_execute */
typedef enum {
OSL_GLOBAL_LOCK_HANDLER,
OSL_NOTIFY_HANDLER,
OSL_GPE_HANDLER,
OSL_DEBUGGER_THREAD,
OSL_EC_POLL_HANDLER,
OSL_EC_BURST_HANDLER
} acpi_execute_type;
#define ACPI_NO_UNIT_LIMIT ((u32) -1)
#define ACPI_MUTEX_SEM 1
/* Functions for acpi_os_signal */
#define ACPI_SIGNAL_FATAL 0
#define ACPI_SIGNAL_BREAKPOINT 1
struct acpi_signal_fatal_info {
u32 type;
u32 code;
u32 argument;
};
/*
* OSL Initialization and shutdown primitives
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_initialize
acpi_status acpi_os_initialize(void);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_terminate
acpi_status acpi_os_terminate(void);
#endif
/*
* ACPI Table interfaces
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_root_pointer
acpi_physical_address acpi_os_get_root_pointer(void);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_predefined_override
acpi_status
acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
acpi_string * new_val);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_table_override
acpi_status
acpi_os_table_override(struct acpi_table_header *existing_table,
struct acpi_table_header **new_table);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_physical_table_override
acpi_status
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
acpi_physical_address * new_address,
u32 *new_table_length);
#endif
/*
* Spinlock primitives
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock
acpi_status acpi_os_create_lock(acpi_spinlock * out_handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_delete_lock
void acpi_os_delete_lock(acpi_spinlock handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_acquire_lock
acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_release_lock
void acpi_os_release_lock(acpi_spinlock handle, acpi_cpu_flags flags);
#endif
/*
* Semaphore primitives
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_semaphore
acpi_status
acpi_os_create_semaphore(u32 max_units,
u32 initial_units, acpi_semaphore * out_handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_delete_semaphore
acpi_status acpi_os_delete_semaphore(acpi_semaphore handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_wait_semaphore
acpi_status
acpi_os_wait_semaphore(acpi_semaphore handle, u32 units, u16 timeout);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_signal_semaphore
acpi_status acpi_os_signal_semaphore(acpi_semaphore handle, u32 units);
#endif
/*
* Mutex primitives. May be configured to use semaphores instead via
* ACPI_MUTEX_TYPE (see platform/acenv.h)
*/
#if (ACPI_MUTEX_TYPE != ACPI_BINARY_SEMAPHORE)
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_mutex
acpi_status acpi_os_create_mutex(acpi_mutex * out_handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_delete_mutex
void acpi_os_delete_mutex(acpi_mutex handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_acquire_mutex
acpi_status acpi_os_acquire_mutex(acpi_mutex handle, u16 timeout);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_release_mutex
void acpi_os_release_mutex(acpi_mutex handle);
#endif
#endif
/*
* Memory allocation and mapping
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_allocate
void *acpi_os_allocate(acpi_size size);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_allocate_zeroed
void *acpi_os_allocate_zeroed(acpi_size size);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_free
void acpi_os_free(void *memory);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_map_memory
void *acpi_os_map_memory(acpi_physical_address where, acpi_size length);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_unmap_memory
void acpi_os_unmap_memory(void *logical_address, acpi_size size);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_physical_address
acpi_status
acpi_os_get_physical_address(void *logical_address,
acpi_physical_address * physical_address);
#endif
/*
* Memory/Object Cache
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_cache
acpi_status
acpi_os_create_cache(char *cache_name,
u16 object_size,
u16 max_depth, acpi_cache_t ** return_cache);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_delete_cache
acpi_status acpi_os_delete_cache(acpi_cache_t * cache);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_purge_cache
acpi_status acpi_os_purge_cache(acpi_cache_t * cache);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_acquire_object
void *acpi_os_acquire_object(acpi_cache_t * cache);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_release_object
acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object);
#endif
/*
* Interrupt handlers
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_install_interrupt_handler
acpi_status
acpi_os_install_interrupt_handler(u32 interrupt_number,
acpi_osd_handler service_routine,
void *context);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_remove_interrupt_handler
acpi_status
acpi_os_remove_interrupt_handler(u32 interrupt_number,
acpi_osd_handler service_routine);
#endif
/*
* Threads and Scheduling
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_thread_id
acpi_thread_id acpi_os_get_thread_id(void);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_execute
acpi_status
acpi_os_execute(acpi_execute_type type,
acpi_osd_exec_callback function, void *context);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_wait_events_complete
void acpi_os_wait_events_complete(void);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_sleep
void acpi_os_sleep(u64 milliseconds);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_stall
void acpi_os_stall(u32 microseconds);
#endif
/*
* Platform and hardware-independent I/O interfaces
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_read_port
acpi_status acpi_os_read_port(acpi_io_address address, u32 *value, u32 width);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_write_port
acpi_status acpi_os_write_port(acpi_io_address address, u32 value, u32 width);
#endif
/*
* Platform and hardware-independent physical memory interfaces
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_read_memory
acpi_status
acpi_os_read_memory(acpi_physical_address address, u64 *value, u32 width);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_write_memory
acpi_status
acpi_os_write_memory(acpi_physical_address address, u64 value, u32 width);
#endif
/*
* Platform and hardware-independent PCI configuration space access
* Note: Can't use "Register" as a parameter, changed to "Reg" --
* certain compilers complain.
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_read_pci_configuration
acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id *pci_id,
u32 reg, u64 *value, u32 width);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_write_pci_configuration
acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id *pci_id,
u32 reg, u64 value, u32 width);
#endif
/*
* Miscellaneous
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_readable
u8 acpi_os_readable(void *pointer, acpi_size length);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_writable
u8 acpi_os_writable(void *pointer, acpi_size length);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_timer
u64 acpi_os_get_timer(void);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_signal
acpi_status acpi_os_signal(u32 function, void *info);
#endif
/*
* Debug print routines
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_printf
void ACPI_INTERNAL_VAR_XFACE acpi_os_printf(const char *format, ...);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_vprintf
void acpi_os_vprintf(const char *format, va_list args);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_redirect_output
void acpi_os_redirect_output(void *destination);
#endif
/*
* Debug input
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_line
acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read);
#endif
/*
* Obtain ACPI table(s)
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_table_by_name
acpi_status
acpi_os_get_table_by_name(char *signature,
u32 instance,
struct acpi_table_header **table,
acpi_physical_address * address);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_table_by_index
acpi_status
acpi_os_get_table_by_index(u32 index,
struct acpi_table_header **table,
u32 *instance, acpi_physical_address * address);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_table_by_address
acpi_status
acpi_os_get_table_by_address(acpi_physical_address address,
struct acpi_table_header **table);
#endif
/*
* Directory manipulation
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_open_directory
void *acpi_os_open_directory(char *pathname,
char *wildcard_spec, char requested_file_type);
#endif
/* requeste_file_type values */
#define REQUEST_FILE_ONLY 0
#define REQUEST_DIR_ONLY 1
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_next_filename
char *acpi_os_get_next_filename(void *dir_handle);
#endif
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_close_directory
void acpi_os_close_directory(void *dir_handle);
#endif
#endif /* __ACPIOSXF_H__ */
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