* recursive call.
*/
if (!walk_state ||
- !obj_desc->method.mutex->mutex.owner_thread ||
- (walk_state->thread !=
- obj_desc->method.mutex->mutex.owner_thread)) {
+ !obj_desc->method.mutex->mutex.thread_id ||
+ (walk_state->thread->thread_id !=
+ obj_desc->method.mutex->mutex.thread_id)) {
/*
* Acquire the method mutex. This releases the interpreter if we
* block (and reacquires it before it returns)
original_sync_level =
walk_state->thread->current_sync_level;
- obj_desc->method.mutex->mutex.owner_thread =
- walk_state->thread;
+ obj_desc->method.mutex->mutex.thread_id =
+ walk_state->thread->thread_id;
walk_state->thread->current_sync_level =
obj_desc->method.sync_level;
} else {
acpi_os_release_mutex(method_desc->method.mutex->mutex.
os_mutex);
- method_desc->method.mutex->mutex.owner_thread = NULL;
+ method_desc->method.mutex->mutex.thread_id = 0;
}
}
* Only one thread can acquire the GL at a time, the global_lock_mutex
* enforces this. This interface releases the interpreter if we must wait.
*/
- status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, 0);
+ status = acpi_ex_system_wait_mutex(
+ acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
if (status == AE_TIME) {
if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
acpi_ev_global_lock_acquired++;
}
if (ACPI_FAILURE(status)) {
- status =
- acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex,
- timeout);
+ status = acpi_ex_system_wait_mutex(
+ acpi_gbl_global_lock_mutex->mutex.os_mutex,
+ timeout);
}
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
/* Release the local GL mutex */
acpi_ev_global_lock_thread_id = NULL;
acpi_ev_global_lock_acquired = 0;
- acpi_os_release_mutex(acpi_gbl_global_lock_mutex);
+ acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
return_ACPI_STATUS(status);
}
*
* DESCRIPTION: Acquire the ACPI Global Lock
*
+ * Note: Allows callers with the same thread ID to acquire the global lock
+ * multiple times. In other words, externally, the behavior of the global lock
+ * is identical to an AML mutex. On the first acquire, a new handle is
+ * returned. On any subsequent calls to acquire by the same thread, the same
+ * handle is returned.
+ *
******************************************************************************/
acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
{
/* Must lock interpreter to prevent race conditions */
acpi_ex_enter_interpreter();
- status = acpi_ev_acquire_global_lock(timeout);
- acpi_ex_exit_interpreter();
+
+ status = acpi_ex_acquire_mutex_object(timeout,
+ acpi_gbl_global_lock_mutex,
+ acpi_os_get_thread_id());
if (ACPI_SUCCESS(status)) {
- acpi_gbl_global_lock_handle++;
+ /*
+ * If this was the first acquisition of the Global Lock by this thread,
+ * create a new handle. Otherwise, return the existing handle.
+ */
+ if (acpi_gbl_global_lock_mutex->mutex.acquisition_depth == 1) {
+ acpi_gbl_global_lock_handle++;
+ }
+
+ /* Return the global lock handle */
+
*handle = acpi_gbl_global_lock_handle;
}
+ acpi_ex_exit_interpreter();
return (status);
}
return (AE_NOT_ACQUIRED);
}
- status = acpi_ev_release_global_lock();
+ status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
return (status);
}
union acpi_operand_object *buffer_desc;
acpi_size length;
void *buffer;
- u8 locked;
ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
/* Lock entire transaction if requested */
- locked =
- acpi_ex_acquire_global_lock(obj_desc->common_field.
- field_flags);
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/*
* Perform the read.
buffer.pointer),
ACPI_READ | (obj_desc->field.
attribute << 16));
- acpi_ex_release_global_lock(locked);
+ acpi_ex_release_global_lock();
goto exit;
}
/* Lock entire transaction if requested */
- locked =
- acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Read from the field */
status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
- acpi_ex_release_global_lock(locked);
+ acpi_ex_release_global_lock();
exit:
if (ACPI_FAILURE(status)) {
u32 required_length;
void *buffer;
void *new_buffer;
- u8 locked;
union acpi_operand_object *buffer_desc;
ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
/* Lock entire transaction if requested */
- locked =
- acpi_ex_acquire_global_lock(obj_desc->common_field.
- field_flags);
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/*
* Perform the write (returns status and perhaps data in the
(acpi_integer *) buffer,
ACPI_WRITE | (obj_desc->field.
attribute << 16));
- acpi_ex_release_global_lock(locked);
+ acpi_ex_release_global_lock();
*result_desc = buffer_desc;
return_ACPI_STATUS(status);
/* Lock entire transaction if requested */
- locked =
- acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+ acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Write to the field */
status = acpi_ex_insert_into_field(obj_desc, buffer, length);
- acpi_ex_release_global_lock(locked);
+ acpi_ex_release_global_lock();
/* Free temporary buffer if we used one */
thread->acquired_mutex_list = obj_desc;
}
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_acquire_mutex_object
+ *
+ * PARAMETERS: time_desc - Timeout in milliseconds
+ * obj_desc - Mutex object
+ * Thread - Current thread state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Acquire an AML mutex, low-level interface
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_acquire_mutex_object(u16 timeout,
+ union acpi_operand_object *obj_desc,
+ acpi_thread_id thread_id)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
+
+ /* Support for multiple acquires by the owning thread */
+
+ if (obj_desc->mutex.thread_id == thread_id) {
+ /*
+ * The mutex is already owned by this thread, just increment the
+ * acquisition depth
+ */
+ obj_desc->mutex.acquisition_depth++;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /* Acquire the mutex, wait if necessary. Special case for Global Lock */
+
+ if (obj_desc == acpi_gbl_global_lock_mutex) {
+ status = acpi_ev_acquire_global_lock(timeout);
+ } else {
+ status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
+ timeout);
+ }
+
+ if (ACPI_FAILURE(status)) {
+
+ /* Includes failure from a timeout on time_desc */
+
+ return_ACPI_STATUS(status);
+ }
+
+ /* Have the mutex: update mutex and save the sync_level */
+
+ obj_desc->mutex.thread_id = thread_id;
+ obj_desc->mutex.acquisition_depth = 1;
+ obj_desc->mutex.original_sync_level = 0;
+ obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */
+
+ return_ACPI_STATUS(AE_OK);
+}
+
/*******************************************************************************
*
* FUNCTION: acpi_ex_acquire_mutex
}
/*
- * Current Sync must be less than or equal to the sync level of the
+ * Current Sync level must be less than or equal to the sync level of the
* mutex. This mechanism provides some deadlock prevention
*/
if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
}
- /* Support for multiple acquires by the owning thread */
+ status = acpi_ex_acquire_mutex_object((u16) time_desc->integer.value,
+ obj_desc,
+ walk_state->thread->thread_id);
+ if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {
+ obj_desc->mutex.owner_thread = walk_state->thread;
+ obj_desc->mutex.original_sync_level =
+ walk_state->thread->current_sync_level;
+ walk_state->thread->current_sync_level =
+ obj_desc->mutex.sync_level;
- if (obj_desc->mutex.owner_thread) {
- if (obj_desc->mutex.owner_thread->thread_id ==
- walk_state->thread->thread_id) {
- /*
- * The mutex is already owned by this thread, just increment the
- * acquisition depth
- */
- obj_desc->mutex.acquisition_depth++;
- return_ACPI_STATUS(AE_OK);
- }
+ /* Link the mutex to the current thread for force-unlock at method exit */
+
+ acpi_ex_link_mutex(obj_desc, walk_state->thread);
}
- /* Acquire the mutex, wait if necessary. Special case for Global Lock */
+ return_ACPI_STATUS(status);
+}
- if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
- status =
- acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
- } else {
- status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
- (u16) time_desc->integer.
- value);
- }
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_release_mutex_object
+ *
+ * PARAMETERS: obj_desc - The object descriptor for this op
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Release a previously acquired Mutex, low level interface.
+ *
+ ******************************************************************************/
- if (ACPI_FAILURE(status)) {
+acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
+{
+ acpi_status status = AE_OK;
- /* Includes failure from a timeout on time_desc */
+ ACPI_FUNCTION_TRACE(ex_release_mutex_object);
- return_ACPI_STATUS(status);
+ /* Match multiple Acquires with multiple Releases */
+
+ obj_desc->mutex.acquisition_depth--;
+ if (obj_desc->mutex.acquisition_depth != 0) {
+
+ /* Just decrement the depth and return */
+
+ return_ACPI_STATUS(AE_OK);
}
- /* Have the mutex: update mutex and walk info and save the sync_level */
+ if (obj_desc->mutex.owner_thread) {
- obj_desc->mutex.owner_thread = walk_state->thread;
- obj_desc->mutex.acquisition_depth = 1;
- obj_desc->mutex.original_sync_level =
- walk_state->thread->current_sync_level;
+ /* Unlink the mutex from the owner's list */
+
+ acpi_ex_unlink_mutex(obj_desc);
+ obj_desc->mutex.owner_thread = NULL;
+ }
- walk_state->thread->current_sync_level = obj_desc->mutex.sync_level;
+ /* Release the mutex, special case for Global Lock */
- /* Link the mutex to the current thread for force-unlock at method exit */
+ if (obj_desc == acpi_gbl_global_lock_mutex) {
+ status = acpi_ev_release_global_lock();
+ } else {
+ acpi_os_release_mutex(obj_desc->mutex.os_mutex);
+ }
- acpi_ex_link_mutex(obj_desc, walk_state->thread);
- return_ACPI_STATUS(AE_OK);
+ obj_desc->mutex.thread_id = 0;
+ return_ACPI_STATUS(status);
}
/*******************************************************************************
return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
}
- /* Sanity check: we must have a valid thread ID */
-
- if (!walk_state->thread) {
- ACPI_ERROR((AE_INFO,
- "Cannot release Mutex [%4.4s], null thread info",
- acpi_ut_get_node_name(obj_desc->mutex.node)));
- return_ACPI_STATUS(AE_AML_INTERNAL);
- }
-
/*
* The Mutex is owned, but this thread must be the owner.
* Special case for Global Lock, any thread can release
*/
if ((obj_desc->mutex.owner_thread->thread_id !=
walk_state->thread->thread_id)
- && (obj_desc->mutex.os_mutex != acpi_gbl_global_lock_mutex)) {
+ && (obj_desc != acpi_gbl_global_lock_mutex)) {
ACPI_ERROR((AE_INFO,
"Thread %lX cannot release Mutex [%4.4s] acquired by thread %lX",
(unsigned long)walk_state->thread->thread_id,
return_ACPI_STATUS(AE_AML_NOT_OWNER);
}
+ /* Sanity check: we must have a valid thread ID */
+
+ if (!walk_state->thread) {
+ ACPI_ERROR((AE_INFO,
+ "Cannot release Mutex [%4.4s], null thread info",
+ acpi_ut_get_node_name(obj_desc->mutex.node)));
+ return_ACPI_STATUS(AE_AML_INTERNAL);
+ }
+
/*
* The sync level of the mutex must be less than or equal to the current
* sync level
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
}
- /* Match multiple Acquires with multiple Releases */
-
- obj_desc->mutex.acquisition_depth--;
- if (obj_desc->mutex.acquisition_depth != 0) {
-
- /* Just decrement the depth and return */
-
- return_ACPI_STATUS(AE_OK);
- }
-
- /* Unlink the mutex from the owner's list */
+ status = acpi_ex_release_mutex_object(obj_desc);
- acpi_ex_unlink_mutex(obj_desc);
-
- /* Release the mutex, special case for Global Lock */
+ /* Restore sync_level */
- if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
- status = acpi_ev_release_global_lock();
- } else {
- acpi_os_release_mutex(obj_desc->mutex.os_mutex);
- }
-
- /* Update the mutex and restore sync_level */
-
- obj_desc->mutex.owner_thread = NULL;
walk_state->thread->current_sync_level =
obj_desc->mutex.original_sync_level;
-
return_ACPI_STATUS(status);
}
/* Release the mutex, special case for Global Lock */
- if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
+ if (obj_desc == acpi_gbl_global_lock_mutex) {
/* Ignore errors */
/* Mark mutex unowned */
obj_desc->mutex.owner_thread = NULL;
+ obj_desc->mutex.thread_id = 0;
/* Update Thread sync_level (Last mutex is the important one) */
* PARAMETERS: field_flags - Flags with Lock rule:
* always_lock or never_lock
*
- * RETURN: TRUE/FALSE indicating whether the lock was actually acquired
+ * RETURN: None
*
- * DESCRIPTION: Obtain the global lock and keep track of this fact via two
- * methods. A global variable keeps the state of the lock, and
- * the state is returned to the caller.
+ * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
+ * flags specifiy that it is to be obtained before field access.
*
******************************************************************************/
-u8 acpi_ex_acquire_global_lock(u32 field_flags)
+void acpi_ex_acquire_global_lock(u32 field_flags)
{
- u8 locked = FALSE;
acpi_status status;
ACPI_FUNCTION_TRACE(ex_acquire_global_lock);
- /* Only attempt lock if the always_lock bit is set */
+ /* Only use the lock if the always_lock bit is set */
+
+ if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {
+ return_VOID;
+ }
- if (field_flags & AML_FIELD_LOCK_RULE_MASK) {
+ /* Attempt to get the global lock, wait forever */
- /* We should attempt to get the lock, wait forever */
+ status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER,
+ acpi_gbl_global_lock_mutex,
+ acpi_os_get_thread_id());
- status = acpi_ev_acquire_global_lock(ACPI_WAIT_FOREVER);
- if (ACPI_SUCCESS(status)) {
- locked = TRUE;
- } else {
- ACPI_EXCEPTION((AE_INFO, status,
- "Could not acquire Global Lock"));
- }
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Could not acquire Global Lock"));
}
- return_UINT8(locked);
+ return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_release_global_lock
*
- * PARAMETERS: locked_by_me - Return value from corresponding call to
- * acquire_global_lock.
+ * PARAMETERS: None
*
* RETURN: None
*
- * DESCRIPTION: Release the global lock if it is locked.
+ * DESCRIPTION: Release the ACPI hardware Global Lock
*
******************************************************************************/
-void acpi_ex_release_global_lock(u8 locked_by_me)
+void acpi_ex_release_global_lock(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(ex_release_global_lock);
- /* Only attempt unlock if the caller locked it */
-
- if (locked_by_me) {
+ /* Release the global lock */
- /* OK, now release the lock */
-
- status = acpi_ev_release_global_lock();
- if (ACPI_FAILURE(status)) {
+ status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
+ if (ACPI_FAILURE(status)) {
- /* Report the error, but there isn't much else we can do */
+ /* Report the error, but there isn't much else we can do */
- ACPI_EXCEPTION((AE_INFO, status,
- "Could not release ACPI Global Lock"));
- }
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Could not release Global Lock"));
}
return_VOID;
/* Special case for ACPI Global Lock */
if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
- acpi_gbl_global_lock_mutex =
- obj_desc->mutex.os_mutex;
+ acpi_gbl_global_lock_mutex = obj_desc;
/* Create additional counting semaphore for global lock */
"***** Mutex %p, OS Mutex %p\n",
object, object->mutex.os_mutex));
- if (object->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
+ if (object == acpi_gbl_global_lock_mutex) {
/* Global Lock has extra semaphore */
ACPI_EXTERN struct acpi_mutex_info acpi_gbl_mutex_info[ACPI_NUM_MUTEX];
/*
- * Global lock semaphore works in conjunction with the actual HW global lock
+ * Global lock mutex is an actual AML mutex object
+ * Global lock semaphore works in conjunction with the HW global lock
*/
-ACPI_EXTERN acpi_mutex acpi_gbl_global_lock_mutex;
+ACPI_EXTERN union acpi_operand_object *acpi_gbl_global_lock_mutex;
ACPI_EXTERN acpi_semaphore acpi_gbl_global_lock_semaphore;
+ACPI_EXTERN u16 acpi_gbl_global_lock_handle;
+ACPI_EXTERN u8 acpi_gbl_global_lock_acquired;
+ACPI_EXTERN u8 acpi_gbl_global_lock_present;
/*
* Spinlocks are used for interfaces that can be possibly called at
ACPI_EXTERN acpi_init_handler acpi_gbl_init_handler;
ACPI_EXTERN struct acpi_walk_state *acpi_gbl_breakpoint_walk;
+/* Owner ID support */
+
+ACPI_EXTERN u32 acpi_gbl_owner_id_mask[ACPI_NUM_OWNERID_MASKS];
+ACPI_EXTERN u8 acpi_gbl_last_owner_id_index;
+ACPI_EXTERN u8 acpi_gbl_next_owner_id_offset;
+
/* Misc */
ACPI_EXTERN u32 acpi_gbl_original_mode;
ACPI_EXTERN u32 acpi_gbl_rsdp_original_location;
ACPI_EXTERN u32 acpi_gbl_ns_lookup_count;
ACPI_EXTERN u32 acpi_gbl_ps_find_count;
-ACPI_EXTERN u32 acpi_gbl_owner_id_mask[ACPI_NUM_OWNERID_MASKS];
ACPI_EXTERN u16 acpi_gbl_pm1_enable_register_save;
-ACPI_EXTERN u16 acpi_gbl_global_lock_handle;
-ACPI_EXTERN u8 acpi_gbl_last_owner_id_index;
-ACPI_EXTERN u8 acpi_gbl_next_owner_id_offset;
ACPI_EXTERN u8 acpi_gbl_debugger_configuration;
-ACPI_EXTERN u8 acpi_gbl_global_lock_acquired;
ACPI_EXTERN u8 acpi_gbl_step_to_next_call;
ACPI_EXTERN u8 acpi_gbl_acpi_hardware_present;
-ACPI_EXTERN u8 acpi_gbl_global_lock_present;
ACPI_EXTERN u8 acpi_gbl_events_initialized;
ACPI_EXTERN u8 acpi_gbl_system_awake_and_running;
union acpi_operand_object *obj_desc,
struct acpi_walk_state *walk_state);
+acpi_status
+acpi_ex_acquire_mutex_object(u16 timeout,
+ union acpi_operand_object *obj_desc,
+ acpi_thread_id thread_id);
+
acpi_status
acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
struct acpi_walk_state *walk_state);
+acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc);
+
void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread);
void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc);
void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc);
-u8 acpi_ex_acquire_global_lock(u32 rule);
+void acpi_ex_acquire_global_lock(u32 rule);
-void acpi_ex_release_global_lock(u8 locked);
+void acpi_ex_release_global_lock(void);
void acpi_ex_eisa_id_to_string(u32 numeric_id, char *out_string);
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 */
- struct acpi_thread_state *owner_thread; /* Current owner of the mutex */
acpi_mutex os_mutex; /* Actual OS synchronization object */
+ acpi_thread_id thread_id; /* Current owner of the mutex */
+ struct acpi_thread_state *owner_thread; /* Current owner of the mutex */
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 */
projects / linux-2.6 / commitdiff