diff options
Diffstat (limited to 'drivers/acpi/acpica/evmisc.c')
| -rw-r--r-- | drivers/acpi/acpica/evmisc.c | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/drivers/acpi/acpica/evmisc.c b/drivers/acpi/acpica/evmisc.c index 7dc80946f7bd..d0b331844427 100644 --- a/drivers/acpi/acpica/evmisc.c +++ b/drivers/acpi/acpica/evmisc.c @@ -45,7 +45,6 @@ #include "accommon.h" #include "acevents.h" #include "acnamesp.h" -#include "acinterp.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evmisc") @@ -53,10 +52,6 @@ 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 @@ -275,304 +270,6 @@ static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context) 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. If there's a thread waiting for - * the global lock, signal it. - * - * 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 u8 acpi_ev_global_lock_pending; - -static u32 acpi_ev_global_lock_handler(void *context) -{ - acpi_status status; - acpi_cpu_flags flags; - - flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock); - - if (!acpi_ev_global_lock_pending) { - goto out; - } - - /* Send a unit to the semaphore */ - - status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1); - if (ACPI_FAILURE(status)) { - ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore")); - } - - acpi_ev_global_lock_pending = FALSE; - - out: - acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags); - - 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_cpu_flags flags; - 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); - } - - flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock); - - do { - - /* Attempt to acquire the actual hardware lock */ - - ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired); - if (acquired) { - acpi_gbl_global_lock_acquired = TRUE; - - ACPI_DEBUG_PRINT((ACPI_DB_EXEC, - "Acquired hardware Global Lock\n")); - break; - } - - acpi_ev_global_lock_pending = TRUE; - - acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags); - - /* - * Did not get the lock. The pending bit was set above, and we - * must 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); - - flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock); - - } while (ACPI_SUCCESS(status)); - - acpi_ev_global_lock_pending = FALSE; - - acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags); - - 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_write_bit_register - (ACPI_BITREG_GLOBAL_LOCK_RELEASE, - ACPI_ENABLE_EVENT); - } - - 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 = 0; - 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 |