| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: evgpe - General Purpose Event handling and dispatch |
| * |
| * Copyright (C) 2000 - 2022, 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 */ |