diff options
Diffstat (limited to 'drivers/acpi/acpica/evgpe.c')
| -rw-r--r-- | drivers/acpi/acpica/evgpe.c | 849 |
1 files changed, 849 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c new file mode 100644 index 000000000..06b9c8dd1 --- /dev/null +++ b/drivers/acpi/acpica/evgpe.c @@ -0,0 +1,849 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: evgpe - General Purpose Event handling and dispatch + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acevents.h" +#include "acnamesp.h" + +#define _COMPONENT ACPI_EVENTS +ACPI_MODULE_NAME("evgpe") +#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ +/* Local prototypes */ +static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context); + +static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context); + +/******************************************************************************* + * + * FUNCTION: acpi_ev_update_gpe_enable_mask + * + * PARAMETERS: gpe_event_info - GPE to update + * + * RETURN: Status + * + * DESCRIPTION: Updates GPE register enable mask based upon whether there are + * runtime references to this GPE + * + ******************************************************************************/ + +acpi_status +acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info) +{ + struct acpi_gpe_register_info *gpe_register_info; + u32 register_bit; + + ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask); + + gpe_register_info = gpe_event_info->register_info; + if (!gpe_register_info) { + return_ACPI_STATUS(AE_NOT_EXIST); + } + + register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); + + /* Clear the run bit up front */ + + ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit); + + /* Set the mask bit only if there are references to this GPE */ + + if (gpe_event_info->runtime_count) { + ACPI_SET_BIT(gpe_register_info->enable_for_run, + (u8)register_bit); + } + + gpe_register_info->enable_mask = gpe_register_info->enable_for_run; + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_enable_gpe + * + * PARAMETERS: gpe_event_info - GPE to enable + * + * RETURN: Status + * + * DESCRIPTION: Enable a GPE. + * + ******************************************************************************/ + +acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(ev_enable_gpe); + + /* Enable the requested GPE */ + + status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_mask_gpe + * + * PARAMETERS: gpe_event_info - GPE to be blocked/unblocked + * is_masked - Whether the GPE is masked or not + * + * RETURN: Status + * + * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime. + * + ******************************************************************************/ + +acpi_status +acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked) +{ + struct acpi_gpe_register_info *gpe_register_info; + u32 register_bit; + + ACPI_FUNCTION_TRACE(ev_mask_gpe); + + gpe_register_info = gpe_event_info->register_info; + if (!gpe_register_info) { + return_ACPI_STATUS(AE_NOT_EXIST); + } + + register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); + + /* Perform the action */ + + if (is_masked) { + if (register_bit & gpe_register_info->mask_for_run) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); + ACPI_SET_BIT(gpe_register_info->mask_for_run, (u8)register_bit); + } else { + if (!(register_bit & gpe_register_info->mask_for_run)) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + ACPI_CLEAR_BIT(gpe_register_info->mask_for_run, + (u8)register_bit); + if (gpe_event_info->runtime_count + && !gpe_event_info->disable_for_dispatch) { + (void)acpi_hw_low_set_gpe(gpe_event_info, + ACPI_GPE_ENABLE); + } + } + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_add_gpe_reference + * + * PARAMETERS: gpe_event_info - Add a reference to this GPE + * clear_on_enable - Clear GPE status before enabling it + * + * RETURN: Status + * + * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is + * hardware-enabled. + * + ******************************************************************************/ + +acpi_status +acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info, + u8 clear_on_enable) +{ + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE(ev_add_gpe_reference); + + if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) { + return_ACPI_STATUS(AE_LIMIT); + } + + gpe_event_info->runtime_count++; + if (gpe_event_info->runtime_count == 1) { + + /* Enable on first reference */ + + if (clear_on_enable) { + (void)acpi_hw_clear_gpe(gpe_event_info); + } + + status = acpi_ev_update_gpe_enable_mask(gpe_event_info); + if (ACPI_SUCCESS(status)) { + status = acpi_ev_enable_gpe(gpe_event_info); + } + + if (ACPI_FAILURE(status)) { + gpe_event_info->runtime_count--; + } + } + + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_remove_gpe_reference + * + * PARAMETERS: gpe_event_info - Remove a reference to this GPE + * + * RETURN: Status + * + * DESCRIPTION: Remove a reference to a GPE. When the last reference is + * removed, the GPE is hardware-disabled. + * + ******************************************************************************/ + +acpi_status +acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) +{ + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE(ev_remove_gpe_reference); + + if (!gpe_event_info->runtime_count) { + return_ACPI_STATUS(AE_LIMIT); + } + + gpe_event_info->runtime_count--; + if (!gpe_event_info->runtime_count) { + + /* Disable on last reference */ + + status = acpi_ev_update_gpe_enable_mask(gpe_event_info); + if (ACPI_SUCCESS(status)) { + status = + acpi_hw_low_set_gpe(gpe_event_info, + ACPI_GPE_DISABLE); + } + + if (ACPI_FAILURE(status)) { + gpe_event_info->runtime_count++; + } + } + + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_low_get_gpe_info + * + * PARAMETERS: gpe_number - Raw GPE number + * gpe_block - A GPE info block + * + * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number + * is not within the specified GPE block) + * + * DESCRIPTION: Returns the event_info struct associated with this GPE. This is + * the low-level implementation of ev_get_gpe_event_info. + * + ******************************************************************************/ + +struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number, + struct acpi_gpe_block_info + *gpe_block) +{ + u32 gpe_index; + + /* + * Validate that the gpe_number is within the specified gpe_block. + * (Two steps) + */ + if (!gpe_block || (gpe_number < gpe_block->block_base_number)) { + return (NULL); + } + + gpe_index = gpe_number - gpe_block->block_base_number; + if (gpe_index >= gpe_block->gpe_count) { + return (NULL); + } + + return (&gpe_block->event_info[gpe_index]); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_get_gpe_event_info + * + * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 + * gpe_number - Raw GPE number + * + * RETURN: A GPE event_info struct. NULL if not a valid GPE + * + * DESCRIPTION: Returns the event_info struct associated with this GPE. + * Validates the gpe_block and the gpe_number + * + * Should be called only when the GPE lists are semaphore locked + * and not subject to change. + * + ******************************************************************************/ + +struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device, + u32 gpe_number) +{ + union acpi_operand_object *obj_desc; + struct acpi_gpe_event_info *gpe_info; + u32 i; + + ACPI_FUNCTION_ENTRY(); + + /* A NULL gpe_device means use the FADT-defined GPE block(s) */ + + if (!gpe_device) { + + /* Examine GPE Block 0 and 1 (These blocks are permanent) */ + + for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) { + gpe_info = acpi_ev_low_get_gpe_info(gpe_number, + acpi_gbl_gpe_fadt_blocks + [i]); + if (gpe_info) { + return (gpe_info); + } + } + + /* The gpe_number was not in the range of either FADT GPE block */ + + return (NULL); + } + + /* A Non-NULL gpe_device means this is a GPE Block Device */ + + obj_desc = + acpi_ns_get_attached_object((struct acpi_namespace_node *) + gpe_device); + if (!obj_desc || !obj_desc->device.gpe_block) { + return (NULL); + } + + return (acpi_ev_low_get_gpe_info + (gpe_number, obj_desc->device.gpe_block)); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_gpe_detect + * + * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt. + * Can have multiple GPE blocks attached. + * + * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED + * + * DESCRIPTION: Detect if any GP events have occurred. This function is + * executed at interrupt level. + * + ******************************************************************************/ + +u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list) +{ + struct acpi_gpe_block_info *gpe_block; + struct acpi_namespace_node *gpe_device; + struct acpi_gpe_register_info *gpe_register_info; + struct acpi_gpe_event_info *gpe_event_info; + u32 gpe_number; + u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; + acpi_cpu_flags flags; + u32 i; + u32 j; + + ACPI_FUNCTION_NAME(ev_gpe_detect); + + /* Check for the case where there are no GPEs */ + + if (!gpe_xrupt_list) { + return (int_status); + } + + /* + * We need to obtain the GPE lock for both the data structs and registers + * Note: Not necessary to obtain the hardware lock, since the GPE + * registers are owned by the gpe_lock. + */ + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); + + /* Examine all GPE blocks attached to this interrupt level */ + + gpe_block = gpe_xrupt_list->gpe_block_list_head; + while (gpe_block) { + gpe_device = gpe_block->node; + + /* + * Read all of the 8-bit GPE status and enable registers in this GPE + * block, saving all of them. Find all currently active GP events. + */ + for (i = 0; i < gpe_block->register_count; i++) { + + /* Get the next status/enable pair */ + + gpe_register_info = &gpe_block->register_info[i]; + + /* + * Optimization: If there are no GPEs enabled within this + * register, we can safely ignore the entire register. + */ + if (!(gpe_register_info->enable_for_run | + gpe_register_info->enable_for_wake)) { + ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, + "Ignore disabled registers for GPE %02X-%02X: " + "RunEnable=%02X, WakeEnable=%02X\n", + gpe_register_info-> + base_gpe_number, + gpe_register_info-> + base_gpe_number + + (ACPI_GPE_REGISTER_WIDTH - 1), + gpe_register_info-> + enable_for_run, + gpe_register_info-> + enable_for_wake)); + continue; + } + + /* Now look at the individual GPEs in this byte register */ + + for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { + + /* Detect and dispatch one GPE bit */ + + gpe_event_info = + &gpe_block-> + event_info[((acpi_size)i * + ACPI_GPE_REGISTER_WIDTH) + j]; + gpe_number = + j + gpe_register_info->base_gpe_number; + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + int_status |= + acpi_ev_detect_gpe(gpe_device, + gpe_event_info, + gpe_number); + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); + } + } + + gpe_block = gpe_block->next; + } + + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + return (int_status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_asynch_execute_gpe_method + * + * PARAMETERS: Context (gpe_event_info) - Info for this GPE + * + * RETURN: None + * + * DESCRIPTION: Perform the actual execution of a GPE control method. This + * function is called from an invocation of acpi_os_execute and + * therefore does NOT execute at interrupt level - so that + * the control method itself is not executed in the context of + * an interrupt handler. + * + ******************************************************************************/ + +static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) +{ + struct acpi_gpe_event_info *gpe_event_info = context; + acpi_status status = AE_OK; + struct acpi_evaluate_info *info; + struct acpi_gpe_notify_info *notify; + + ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method); + + /* Do the correct dispatch - normal method or implicit notify */ + + switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) { + case ACPI_GPE_DISPATCH_NOTIFY: + /* + * Implicit notify. + * Dispatch a DEVICE_WAKE notify to the appropriate handler. + * NOTE: the request is queued for execution after this method + * completes. The notify handlers are NOT invoked synchronously + * from this thread -- because handlers may in turn run other + * control methods. + * + * June 2012: Expand implicit notify mechanism to support + * notifies on multiple device objects. + */ + notify = gpe_event_info->dispatch.notify_list; + while (ACPI_SUCCESS(status) && notify) { + status = + acpi_ev_queue_notify_request(notify->device_node, + ACPI_NOTIFY_DEVICE_WAKE); + + notify = notify->next; + } + + break; + + case ACPI_GPE_DISPATCH_METHOD: + + /* Allocate the evaluation information block */ + + info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); + if (!info) { + status = AE_NO_MEMORY; + } else { + /* + * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the + * _Lxx/_Exx control method that corresponds to this GPE + */ + info->prefix_node = + gpe_event_info->dispatch.method_node; + info->flags = ACPI_IGNORE_RETURN_VALUE; + + status = acpi_ns_evaluate(info); + ACPI_FREE(info); + } + + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "while evaluating GPE method [%4.4s]", + acpi_ut_get_node_name(gpe_event_info-> + dispatch. + method_node))); + } + break; + + default: + + goto error_exit; /* Should never happen */ + } + + /* Defer enabling of GPE until all notify handlers are done */ + + status = acpi_os_execute(OSL_NOTIFY_HANDLER, + acpi_ev_asynch_enable_gpe, gpe_event_info); + if (ACPI_SUCCESS(status)) { + return_VOID; + } + +error_exit: + acpi_ev_asynch_enable_gpe(gpe_event_info); + return_VOID; +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_asynch_enable_gpe + * + * PARAMETERS: Context (gpe_event_info) - Info for this GPE + * Callback from acpi_os_execute + * + * RETURN: None + * + * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to + * complete (i.e., finish execution of Notify) + * + ******************************************************************************/ + +static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context) +{ + struct acpi_gpe_event_info *gpe_event_info = context; + acpi_cpu_flags flags; + + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); + (void)acpi_ev_finish_gpe(gpe_event_info); + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + + return; +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_finish_gpe + * + * PARAMETERS: gpe_event_info - Info for this GPE + * + * RETURN: Status + * + * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution + * of a GPE method or a synchronous or asynchronous GPE handler. + * + ******************************************************************************/ + +acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info) +{ + acpi_status status; + + if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == + ACPI_GPE_LEVEL_TRIGGERED) { + /* + * GPE is level-triggered, we clear the GPE status bit after + * handling the event. + */ + status = acpi_hw_clear_gpe(gpe_event_info); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + /* + * Enable this GPE, conditionally. This means that the GPE will + * only be physically enabled if the enable_mask bit is set + * in the event_info. + */ + (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE); + gpe_event_info->disable_for_dispatch = FALSE; + return (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ev_detect_gpe + * + * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 + * gpe_event_info - Info for this GPE + * gpe_number - Number relative to the parent GPE block + * + * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED + * + * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function + * (e.g. EC) or method (e.g. _Lxx/_Exx) handler. + * NOTE: GPE is W1C, so it is possible to handle a single GPE from both + * task and irq context in parallel as long as the process to + * detect and mask the GPE is atomic. + * However the atomicity of ACPI_GPE_DISPATCH_RAW_HANDLER is + * dependent on the raw handler itself. + * + ******************************************************************************/ + +u32 +acpi_ev_detect_gpe(struct acpi_namespace_node *gpe_device, + struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number) +{ + u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; + u8 enabled_status_byte; + u64 status_reg; + u64 enable_reg; + u32 register_bit; + struct acpi_gpe_register_info *gpe_register_info; + struct acpi_gpe_handler_info *gpe_handler_info; + acpi_cpu_flags flags; + acpi_status status; + + ACPI_FUNCTION_TRACE(ev_gpe_detect); + + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); + + if (!gpe_event_info) { + gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); + if (!gpe_event_info) + goto error_exit; + } + + /* Get the info block for the entire GPE register */ + + gpe_register_info = gpe_event_info->register_info; + + /* Get the register bitmask for this GPE */ + + register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); + + /* GPE currently enabled (enable bit == 1)? */ + + status = acpi_hw_gpe_read(&enable_reg, &gpe_register_info->enable_address); + if (ACPI_FAILURE(status)) { + goto error_exit; + } + + /* GPE currently active (status bit == 1)? */ + + status = acpi_hw_gpe_read(&status_reg, &gpe_register_info->status_address); + if (ACPI_FAILURE(status)) { + goto error_exit; + } + + /* Check if there is anything active at all in this GPE */ + + ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, + "Read registers for GPE %02X: Status=%02X, Enable=%02X, " + "RunEnable=%02X, WakeEnable=%02X\n", + gpe_number, + (u32)(status_reg & register_bit), + (u32)(enable_reg & register_bit), + gpe_register_info->enable_for_run, + gpe_register_info->enable_for_wake)); + + enabled_status_byte = (u8)(status_reg & enable_reg); + if (!(enabled_status_byte & register_bit)) { + goto error_exit; + } + + /* Invoke global event handler if present */ + + acpi_gpe_count++; + if (acpi_gbl_global_event_handler) { + acpi_gbl_global_event_handler(ACPI_EVENT_TYPE_GPE, + gpe_device, gpe_number, + acpi_gbl_global_event_handler_context); + } + + /* Found an active GPE */ + + if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) == + ACPI_GPE_DISPATCH_RAW_HANDLER) { + + /* Dispatch the event to a raw handler */ + + gpe_handler_info = gpe_event_info->dispatch.handler; + + /* + * There is no protection around the namespace node + * and the GPE handler to ensure a safe destruction + * because: + * 1. The namespace node is expected to always + * exist after loading a table. + * 2. The GPE handler is expected to be flushed by + * acpi_os_wait_events_complete() before the + * destruction. + */ + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + int_status |= + gpe_handler_info->address(gpe_device, gpe_number, + gpe_handler_info->context); + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); + } else { + /* Dispatch the event to a standard handler or method. */ + + int_status |= acpi_ev_gpe_dispatch(gpe_device, + gpe_event_info, gpe_number); + } + +error_exit: + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + return (int_status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ev_gpe_dispatch + * + * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 + * gpe_event_info - Info for this GPE + * gpe_number - Number relative to the parent GPE block + * + * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED + * + * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) + * or method (e.g. _Lxx/_Exx) handler. + * + ******************************************************************************/ + +u32 +acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device, + struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number) +{ + acpi_status status; + u32 return_value; + + ACPI_FUNCTION_TRACE(ev_gpe_dispatch); + + /* + * Always disable the GPE so that it does not keep firing before + * any asynchronous activity completes (either from the execution + * of a GPE method or an asynchronous GPE handler.) + * + * If there is no handler or method to run, just disable the + * GPE and leave it disabled permanently to prevent further such + * pointless events from firing. + */ + status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "Unable to disable GPE %02X", gpe_number)); + return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); + } + + /* + * If edge-triggered, clear the GPE status bit now. Note that + * level-triggered events are cleared after the GPE is serviced. + */ + if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == + ACPI_GPE_EDGE_TRIGGERED) { + status = acpi_hw_clear_gpe(gpe_event_info); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "Unable to clear GPE %02X", + gpe_number)); + (void)acpi_hw_low_set_gpe(gpe_event_info, + ACPI_GPE_CONDITIONAL_ENABLE); + return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); + } + } + + gpe_event_info->disable_for_dispatch = TRUE; + + /* + * Dispatch the GPE to either an installed handler or the control + * method associated with this GPE (_Lxx or _Exx). If a handler + * exists, we invoke it and do not attempt to run the method. + * If there is neither a handler nor a method, leave the GPE + * disabled. + */ + switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) { + case ACPI_GPE_DISPATCH_HANDLER: + + /* Invoke the installed handler (at interrupt level) */ + + return_value = + gpe_event_info->dispatch.handler->address(gpe_device, + gpe_number, + gpe_event_info-> + dispatch.handler-> + context); + + /* If requested, clear (if level-triggered) and re-enable the GPE */ + + if (return_value & ACPI_REENABLE_GPE) { + (void)acpi_ev_finish_gpe(gpe_event_info); + } + break; + + case ACPI_GPE_DISPATCH_METHOD: + case ACPI_GPE_DISPATCH_NOTIFY: + /* + * Execute the method associated with the GPE + * NOTE: Level-triggered GPEs are cleared after the method completes. + */ + status = acpi_os_execute(OSL_GPE_HANDLER, + acpi_ev_asynch_execute_gpe_method, + gpe_event_info); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "Unable to queue handler for GPE %02X - event disabled", + gpe_number)); + } + break; + + default: + /* + * No handler or method to run! + * 03/2010: This case should no longer be possible. We will not allow + * a GPE to be enabled if it has no handler or method. + */ + ACPI_ERROR((AE_INFO, + "No handler or method for GPE %02X, disabling event", + gpe_number)); + + break; + } + + return_UINT32(ACPI_INTERRUPT_HANDLED); +} + +#endif /* !ACPI_REDUCED_HARDWARE */ |