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Diffstat (limited to 'drivers/acpi/acpica/evgpe.c')
-rw-r--r--drivers/acpi/acpica/evgpe.c282
1 files changed, 132 insertions, 150 deletions
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
index 410a3907c051..abbd59063906 100644
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -1,45 +1,11 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: evgpe - General Purpose Event handling and dispatch
*
- *****************************************************************************/
-
-/*
* Copyright (C) 2000 - 2018, 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 "accommon.h"
@@ -105,7 +71,7 @@ acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
*
* RETURN: Status
*
- * DESCRIPTION: Clear a GPE of stale events and enable it.
+ * DESCRIPTION: Enable a GPE.
*
******************************************************************************/
@@ -115,13 +81,6 @@ acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
ACPI_FUNCTION_TRACE(ev_enable_gpe);
- /* Clear the GPE (of stale events) */
-
- status = acpi_hw_clear_gpe(gpe_event_info);
- if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
- }
-
/* Enable the requested GPE */
status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
@@ -381,17 +340,12 @@ struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
{
- acpi_status status;
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;
- struct acpi_gpe_handler_info *gpe_handler_info;
u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
- u8 enabled_status_byte;
- u64 status_reg;
- u64 enable_reg;
acpi_cpu_flags flags;
u32 i;
u32 j;
@@ -448,49 +402,11 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
continue;
}
- /* Read the Status Register */
-
- status =
- acpi_hw_read(&status_reg,
- &gpe_register_info->status_address);
- if (ACPI_FAILURE(status)) {
- goto unlock_and_exit;
- }
-
- /* Read the Enable Register */
-
- status =
- acpi_hw_read(&enable_reg,
- &gpe_register_info->enable_address);
- if (ACPI_FAILURE(status)) {
- goto unlock_and_exit;
- }
-
- ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
- "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
- "RunEnable=%02X, WakeEnable=%02X\n",
- gpe_register_info->base_gpe_number,
- gpe_register_info->base_gpe_number +
- (ACPI_GPE_REGISTER_WIDTH - 1),
- (u32)status_reg, (u32)enable_reg,
- gpe_register_info->enable_for_run,
- gpe_register_info->enable_for_wake));
-
- /* Check if there is anything active at all in this register */
-
- enabled_status_byte = (u8)(status_reg & enable_reg);
- if (!enabled_status_byte) {
-
- /* No active GPEs in this register, move on */
-
- continue;
- }
-
/* Now look at the individual GPEs in this byte register */
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
- /* Examine one GPE bit */
+ /* Detect and dispatch one GPE bit */
gpe_event_info =
&gpe_block->
@@ -498,71 +414,18 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
ACPI_GPE_REGISTER_WIDTH) + j];
gpe_number =
j + gpe_register_info->base_gpe_number;
-
- if (enabled_status_byte & (1 << j)) {
-
- /* 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);
- }
- }
+ 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;
}
-unlock_and_exit:
-
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return (int_status);
}
@@ -735,6 +598,127 @@ acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
/*******************************************************************************
*
+ * 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);
+
+ /* 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_read(&enable_reg, &gpe_register_info->enable_address);
+ if (ACPI_FAILURE(status)) {
+ goto error_exit;
+ }
+
+ /* GPE currently active (status bit == 1)? */
+
+ status = acpi_hw_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
@@ -746,8 +730,6 @@ acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
* DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
* or method (e.g. _Lxx/_Exx) handler.
*
- * This function executes at interrupt level.
- *
******************************************************************************/
u32