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-rw-r--r--drivers/acpi/acpica/evmisc.c621
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diff --git a/drivers/acpi/acpica/evmisc.c b/drivers/acpi/acpica/evmisc.c
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index 00000000000..16f2c1a0016
--- /dev/null
+++ b/drivers/acpi/acpica/evmisc.c
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+/******************************************************************************
+ *
+ * Module Name: evmisc - Miscellaneous event manager support functions
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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.
+ */
+
+#include <acpi/acpi.h>
+#include <acpi/accommon.h>
+#include <acpi/acevents.h>
+#include <acpi/acnamesp.h>
+#include <acpi/acinterp.h>
+
+#define _COMPONENT ACPI_EVENTS
+ACPI_MODULE_NAME("evmisc")
+
+/* Local prototypes */
+static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
+
+static u32 acpi_ev_global_lock_handler(void *context);
+
+static acpi_status acpi_ev_remove_global_lock_handler(void);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_is_notify_object
+ *
+ * PARAMETERS: Node - Node to check
+ *
+ * RETURN: TRUE if notifies allowed on this object
+ *
+ * DESCRIPTION: Check type of node for a object that supports notifies.
+ *
+ * TBD: This could be replaced by a flag bit in the node.
+ *
+ ******************************************************************************/
+
+u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
+{
+ switch (node->type) {
+ case ACPI_TYPE_DEVICE:
+ case ACPI_TYPE_PROCESSOR:
+ case ACPI_TYPE_THERMAL:
+ /*
+ * These are the ONLY objects that can receive ACPI notifications
+ */
+ return (TRUE);
+
+ default:
+ return (FALSE);
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_queue_notify_request
+ *
+ * PARAMETERS: Node - NS node for the notified object
+ * notify_value - Value from the Notify() request
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Dispatch a device notification event to a previously
+ * installed handler.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
+ u32 notify_value)
+{
+ union acpi_operand_object *obj_desc;
+ union acpi_operand_object *handler_obj = NULL;
+ union acpi_generic_state *notify_info;
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_NAME(ev_queue_notify_request);
+
+ /*
+ * For value 3 (Ejection Request), some device method may need to be run.
+ * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
+ * to be run.
+ * For value 0x80 (Status Change) on the power button or sleep button,
+ * initiate soft-off or sleep operation?
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
+ acpi_ut_get_node_name(node), node, notify_value,
+ acpi_ut_get_notify_name(notify_value)));
+
+ /* Get the notify object attached to the NS Node */
+
+ obj_desc = acpi_ns_get_attached_object(node);
+ if (obj_desc) {
+
+ /* We have the notify object, Get the right handler */
+
+ switch (node->type) {
+
+ /* Notify allowed only on these types */
+
+ case ACPI_TYPE_DEVICE:
+ case ACPI_TYPE_THERMAL:
+ case ACPI_TYPE_PROCESSOR:
+
+ if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
+ handler_obj =
+ obj_desc->common_notify.system_notify;
+ } else {
+ handler_obj =
+ obj_desc->common_notify.device_notify;
+ }
+ break;
+
+ default:
+
+ /* All other types are not supported */
+
+ return (AE_TYPE);
+ }
+ }
+
+ /*
+ * If there is any handler to run, schedule the dispatcher.
+ * Check for:
+ * 1) Global system notify handler
+ * 2) Global device notify handler
+ * 3) Per-device notify handler
+ */
+ if ((acpi_gbl_system_notify.handler
+ && (notify_value <= ACPI_MAX_SYS_NOTIFY))
+ || (acpi_gbl_device_notify.handler
+ && (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
+ notify_info = acpi_ut_create_generic_state();
+ if (!notify_info) {
+ return (AE_NO_MEMORY);
+ }
+
+ if (!handler_obj) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Executing system notify handler for Notify (%4.4s, %X) node %p\n",
+ acpi_ut_get_node_name(node),
+ notify_value, node));
+ }
+
+ notify_info->common.descriptor_type =
+ ACPI_DESC_TYPE_STATE_NOTIFY;
+ notify_info->notify.node = node;
+ notify_info->notify.value = (u16) notify_value;
+ notify_info->notify.handler_obj = handler_obj;
+
+ status =
+ acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
+ notify_info);
+ if (ACPI_FAILURE(status)) {
+ acpi_ut_delete_generic_state(notify_info);
+ }
+ } else {
+ /* There is no notify handler (per-device or system) for this device */
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "No notify handler for Notify (%4.4s, %X) node %p\n",
+ acpi_ut_get_node_name(node), notify_value,
+ node));
+ }
+
+ return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_notify_dispatch
+ *
+ * PARAMETERS: Context - To be passed to the notify handler
+ *
+ * RETURN: None.
+ *
+ * DESCRIPTION: Dispatch a device notification event to a previously
+ * installed handler.
+ *
+ ******************************************************************************/
+
+static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
+{
+ union acpi_generic_state *notify_info =
+ (union acpi_generic_state *)context;
+ acpi_notify_handler global_handler = NULL;
+ void *global_context = NULL;
+ union acpi_operand_object *handler_obj;
+
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * We will invoke a global notify handler if installed. This is done
+ * _before_ we invoke the per-device handler attached to the device.
+ */
+ if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
+
+ /* Global system notification handler */
+
+ if (acpi_gbl_system_notify.handler) {
+ global_handler = acpi_gbl_system_notify.handler;
+ global_context = acpi_gbl_system_notify.context;
+ }
+ } else {
+ /* Global driver notification handler */
+
+ if (acpi_gbl_device_notify.handler) {
+ global_handler = acpi_gbl_device_notify.handler;
+ global_context = acpi_gbl_device_notify.context;
+ }
+ }
+
+ /* Invoke the system handler first, if present */
+
+ if (global_handler) {
+ global_handler(notify_info->notify.node,
+ notify_info->notify.value, global_context);
+ }
+
+ /* Now invoke the per-device handler, if present */
+
+ handler_obj = notify_info->notify.handler_obj;
+ if (handler_obj) {
+ handler_obj->notify.handler(notify_info->notify.node,
+ notify_info->notify.value,
+ handler_obj->notify.context);
+ }
+
+ /* All done with the info object */
+
+ acpi_ut_delete_generic_state(notify_info);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_global_lock_handler
+ *
+ * PARAMETERS: Context - From thread interface, not used
+ *
+ * RETURN: ACPI_INTERRUPT_HANDLED
+ *
+ * DESCRIPTION: Invoked directly from the SCI handler when a global lock
+ * release interrupt occurs. Attempt to acquire the global lock,
+ * if successful, signal the thread waiting for the lock.
+ *
+ * NOTE: Assumes that the semaphore can be signaled from interrupt level. If
+ * this is not possible for some reason, a separate thread will have to be
+ * scheduled to do this.
+ *
+ ******************************************************************************/
+
+static u32 acpi_ev_global_lock_handler(void *context)
+{
+ u8 acquired = FALSE;
+
+ /*
+ * Attempt to get the lock.
+ *
+ * If we don't get it now, it will be marked pending and we will
+ * take another interrupt when it becomes free.
+ */
+ ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
+ if (acquired) {
+
+ /* Got the lock, now wake all threads waiting for it */
+
+ acpi_gbl_global_lock_acquired = TRUE;
+ /* Send a unit to the semaphore */
+
+ if (ACPI_FAILURE
+ (acpi_os_signal_semaphore
+ (acpi_gbl_global_lock_semaphore, 1))) {
+ ACPI_ERROR((AE_INFO,
+ "Could not signal Global Lock semaphore"));
+ }
+ }
+
+ return (ACPI_INTERRUPT_HANDLED);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_init_global_lock_handler
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Install a handler for the global lock release event
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_init_global_lock_handler(void)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
+
+ /* Attempt installation of the global lock handler */
+
+ status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
+ acpi_ev_global_lock_handler,
+ NULL);
+
+ /*
+ * If the global lock does not exist on this platform, the attempt to
+ * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
+ * Map to AE_OK, but mark global lock as not present. Any attempt to
+ * actually use the global lock will be flagged with an error.
+ */
+ if (status == AE_NO_HARDWARE_RESPONSE) {
+ ACPI_ERROR((AE_INFO,
+ "No response from Global Lock hardware, disabling lock"));
+
+ acpi_gbl_global_lock_present = FALSE;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ acpi_gbl_global_lock_present = TRUE;
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_remove_global_lock_handler
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Remove the handler for the Global Lock
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ev_remove_global_lock_handler(void)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
+
+ acpi_gbl_global_lock_present = FALSE;
+ status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
+ acpi_ev_global_lock_handler);
+
+ return_ACPI_STATUS(status);
+}
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_ev_acquire_global_lock
+ *
+ * PARAMETERS: Timeout - Max time to wait for the lock, in millisec.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Attempt to gain ownership of the Global Lock.
+ *
+ * MUTEX: Interpreter must be locked
+ *
+ * Note: The original implementation allowed multiple threads to "acquire" the
+ * Global Lock, and the OS would hold the lock until the last thread had
+ * released it. However, this could potentially starve the BIOS out of the
+ * lock, especially in the case where there is a tight handshake between the
+ * Embedded Controller driver and the BIOS. Therefore, this implementation
+ * allows only one thread to acquire the HW Global Lock at a time, and makes
+ * the global lock appear as a standard mutex on the OS side.
+ *
+ *****************************************************************************/
+static acpi_thread_id acpi_ev_global_lock_thread_id;
+static int acpi_ev_global_lock_acquired;
+
+acpi_status acpi_ev_acquire_global_lock(u16 timeout)
+{
+ acpi_status status = AE_OK;
+ u8 acquired = FALSE;
+
+ ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
+
+ /*
+ * 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->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++;
+ return AE_OK;
+ }
+ }
+
+ if (ACPI_FAILURE(status)) {
+ status = acpi_ex_system_wait_mutex(
+ acpi_gbl_global_lock_mutex->mutex.os_mutex,
+ timeout);
+ }
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
+ acpi_ev_global_lock_acquired++;
+
+ /*
+ * Update the global lock handle and check for wraparound. The handle is
+ * only used for the external global lock interfaces, but it is updated
+ * here to properly handle the case where a single thread may acquire the
+ * lock via both the AML and the acpi_acquire_global_lock interfaces. The
+ * handle is therefore updated on the first acquire from a given thread
+ * regardless of where the acquisition request originated.
+ */
+ acpi_gbl_global_lock_handle++;
+ if (acpi_gbl_global_lock_handle == 0) {
+ acpi_gbl_global_lock_handle = 1;
+ }
+
+ /*
+ * Make sure that a global lock actually exists. If not, just treat the
+ * lock as a standard mutex.
+ */
+ if (!acpi_gbl_global_lock_present) {
+ acpi_gbl_global_lock_acquired = TRUE;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /* Attempt to acquire the actual hardware lock */
+
+ ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
+ if (acquired) {
+
+ /* We got the lock */
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Acquired hardware Global Lock\n"));
+
+ acpi_gbl_global_lock_acquired = TRUE;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /*
+ * Did not get the lock. The pending bit was set above, and we must now
+ * wait until we get the global lock released interrupt.
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n"));
+
+ /*
+ * Wait for handshake with the global lock interrupt handler.
+ * This interface releases the interpreter if we must wait.
+ */
+ status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
+ ACPI_WAIT_FOREVER);
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_release_global_lock
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Releases ownership of the Global Lock.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_release_global_lock(void)
+{
+ u8 pending = FALSE;
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_TRACE(ev_release_global_lock);
+
+ /* Lock must be already acquired */
+
+ if (!acpi_gbl_global_lock_acquired) {
+ ACPI_WARNING((AE_INFO,
+ "Cannot release the ACPI Global Lock, it has not been acquired"));
+ return_ACPI_STATUS(AE_NOT_ACQUIRED);
+ }
+
+ acpi_ev_global_lock_acquired--;
+ if (acpi_ev_global_lock_acquired > 0) {
+ return AE_OK;
+ }
+
+ if (acpi_gbl_global_lock_present) {
+
+ /* Allow any thread to release the lock */
+
+ ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
+
+ /*
+ * If the pending bit was set, we must write GBL_RLS to the control
+ * register
+ */
+ if (pending) {
+ status =
+ acpi_set_register(ACPI_BITREG_GLOBAL_LOCK_RELEASE,
+ 1);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Released hardware Global Lock\n"));
+ }
+
+ acpi_gbl_global_lock_acquired = FALSE;
+
+ /* 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->mutex.os_mutex);
+ return_ACPI_STATUS(status);
+}
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_ev_terminate
+ *
+ * PARAMETERS: none
+ *
+ * RETURN: none
+ *
+ * DESCRIPTION: Disable events and free memory allocated for table storage.
+ *
+ ******************************************************************************/
+
+void acpi_ev_terminate(void)
+{
+ u32 i;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ev_terminate);
+
+ if (acpi_gbl_events_initialized) {
+ /*
+ * Disable all event-related functionality. In all cases, on error,
+ * print a message but obviously we don't abort.
+ */
+
+ /* Disable all fixed events */
+
+ for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
+ status = acpi_disable_event(i, 0);
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Could not disable fixed event %d",
+ (u32) i));
+ }
+ }
+
+ /* Disable all GPEs in all GPE blocks */
+
+ status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
+
+ /* Remove SCI handler */
+
+ status = acpi_ev_remove_sci_handler();
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
+ }
+
+ status = acpi_ev_remove_global_lock_handler();
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Could not remove Global Lock handler"));
+ }
+ }
+
+ /* Deallocate all handler objects installed within GPE info structs */
+
+ status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
+
+ /* Return to original mode if necessary */
+
+ if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
+ status = acpi_disable();
+ if (ACPI_FAILURE(status)) {
+ ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
+ }
+ }
+ return_VOID;
+}