/****************************************************************************** * * 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 #include #include #include #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evmisc") /* Pointer to FACS needed for the Global Lock */ static struct acpi_table_facs *facs = NULL; /* 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(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); status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, ACPI_CAST_INDIRECT_PTR(struct acpi_table_header, &facs)); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } acpi_gbl_global_lock_present = TRUE; 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; status = AE_OK; } 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(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(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); /* 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); /* 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; }