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-rw-r--r--libacpica/evgpeutil.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/libacpica/evgpeutil.c b/libacpica/evgpeutil.c
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+++ b/libacpica/evgpeutil.c
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+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: evgpeutil - GPE utilities
+ *
+ * Copyright (C) 2000 - 2021, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acevents.h"
+
+#define _COMPONENT ACPI_EVENTS
+ACPI_MODULE_NAME("evgpeutil")
+#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_walk_gpe_list
+ *
+ * PARAMETERS: gpe_walk_callback - Routine called for each GPE block
+ * context - Value passed to callback
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Walk the GPE lists.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
+{
+ struct acpi_gpe_block_info *gpe_block;
+ struct acpi_gpe_xrupt_info *gpe_xrupt_info;
+ acpi_status status = AE_OK;
+ acpi_cpu_flags flags;
+
+ ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
+
+ flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+ /* Walk the interrupt level descriptor list */
+
+ gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
+ while (gpe_xrupt_info) {
+
+ /* Walk all Gpe Blocks attached to this interrupt level */
+
+ gpe_block = gpe_xrupt_info->gpe_block_list_head;
+ while (gpe_block) {
+
+ /* One callback per GPE block */
+
+ status =
+ gpe_walk_callback(gpe_xrupt_info, gpe_block,
+ context);
+ if (ACPI_FAILURE(status)) {
+ if (status == AE_CTRL_END) { /* Callback abort */
+ status = AE_OK;
+ }
+ goto unlock_and_exit;
+ }
+
+ gpe_block = gpe_block->next;
+ }
+
+ gpe_xrupt_info = gpe_xrupt_info->next;
+ }
+
+unlock_and_exit:
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_get_gpe_device
+ *
+ * PARAMETERS: GPE_WALK_CALLBACK
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
+ * block device. NULL if the GPE is one of the FADT-defined GPEs.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
+ struct acpi_gpe_block_info *gpe_block, void *context)
+{
+ struct acpi_gpe_device_info *info = context;
+
+ /* Increment Index by the number of GPEs in this block */
+
+ info->next_block_base_index += gpe_block->gpe_count;
+
+ if (info->index < info->next_block_base_index) {
+ /*
+ * The GPE index is within this block, get the node. Leave the node
+ * NULL for the FADT-defined GPEs
+ */
+ if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
+ info->gpe_device = gpe_block->node;
+ }
+
+ info->status = AE_OK;
+ return (AE_CTRL_END);
+ }
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_get_gpe_xrupt_block
+ *
+ * PARAMETERS: interrupt_number - Interrupt for a GPE block
+ * gpe_xrupt_block - Where the block is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
+ * block per unique interrupt level used for GPEs. Should be
+ * called only when the GPE lists are semaphore locked and not
+ * subject to change.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_get_gpe_xrupt_block(u32 interrupt_number,
+ struct acpi_gpe_xrupt_info **gpe_xrupt_block)
+{
+ struct acpi_gpe_xrupt_info *next_gpe_xrupt;
+ struct acpi_gpe_xrupt_info *gpe_xrupt;
+ acpi_status status;
+ acpi_cpu_flags flags;
+
+ ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
+
+ /* No need for lock since we are not changing any list elements here */
+
+ next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
+ while (next_gpe_xrupt) {
+ if (next_gpe_xrupt->interrupt_number == interrupt_number) {
+ *gpe_xrupt_block = next_gpe_xrupt;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ next_gpe_xrupt = next_gpe_xrupt->next;
+ }
+
+ /* Not found, must allocate a new xrupt descriptor */
+
+ gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
+ if (!gpe_xrupt) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ gpe_xrupt->interrupt_number = interrupt_number;
+
+ /* Install new interrupt descriptor with spin lock */
+
+ flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+ if (acpi_gbl_gpe_xrupt_list_head) {
+ next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
+ while (next_gpe_xrupt->next) {
+ next_gpe_xrupt = next_gpe_xrupt->next;
+ }
+
+ next_gpe_xrupt->next = gpe_xrupt;
+ gpe_xrupt->previous = next_gpe_xrupt;
+ } else {
+ acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
+ }
+
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
+ /* Install new interrupt handler if not SCI_INT */
+
+ if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
+ status = acpi_os_install_interrupt_handler(interrupt_number,
+ acpi_ev_gpe_xrupt_handler,
+ gpe_xrupt);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Could not install GPE interrupt handler at level 0x%X",
+ interrupt_number));
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ *gpe_xrupt_block = gpe_xrupt;
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_delete_gpe_xrupt
+ *
+ * PARAMETERS: gpe_xrupt - A GPE interrupt info block
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
+ * interrupt handler if not the SCI interrupt.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
+{
+ acpi_status status;
+ acpi_cpu_flags flags;
+
+ ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
+
+ /* We never want to remove the SCI interrupt handler */
+
+ if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
+ gpe_xrupt->gpe_block_list_head = NULL;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /* Disable this interrupt */
+
+ status =
+ acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
+ acpi_ev_gpe_xrupt_handler);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Unlink the interrupt block with lock */
+
+ flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+ if (gpe_xrupt->previous) {
+ gpe_xrupt->previous->next = gpe_xrupt->next;
+ } else {
+ /* No previous, update list head */
+
+ acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
+ }
+
+ if (gpe_xrupt->next) {
+ gpe_xrupt->next->previous = gpe_xrupt->previous;
+ }
+ acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
+ /* Free the block */
+
+ ACPI_FREE(gpe_xrupt);
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ev_delete_gpe_handlers
+ *
+ * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
+ * gpe_block - Gpe Block info
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
+ * Used only prior to termination.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
+ struct acpi_gpe_block_info *gpe_block,
+ void *context)
+{
+ struct acpi_gpe_event_info *gpe_event_info;
+ struct acpi_gpe_notify_info *notify;
+ struct acpi_gpe_notify_info *next;
+ u32 i;
+ u32 j;
+
+ ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
+
+ /* Examine each GPE Register within the block */
+
+ for (i = 0; i < gpe_block->register_count; i++) {
+
+ /* Now look at the individual GPEs in this byte register */
+
+ for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
+ gpe_event_info = &gpe_block->event_info[((acpi_size)i *
+ ACPI_GPE_REGISTER_WIDTH)
+ + j];
+
+ if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
+ ACPI_GPE_DISPATCH_HANDLER) ||
+ (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
+ ACPI_GPE_DISPATCH_RAW_HANDLER)) {
+
+ /* Delete an installed handler block */
+
+ ACPI_FREE(gpe_event_info->dispatch.handler);
+ gpe_event_info->dispatch.handler = NULL;
+ gpe_event_info->flags &=
+ ~ACPI_GPE_DISPATCH_MASK;
+ } else if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)
+ == ACPI_GPE_DISPATCH_NOTIFY) {
+
+ /* Delete the implicit notification device list */
+
+ notify = gpe_event_info->dispatch.notify_list;
+ while (notify) {
+ next = notify->next;
+ ACPI_FREE(notify);
+ notify = next;
+ }
+
+ gpe_event_info->dispatch.notify_list = NULL;
+ gpe_event_info->flags &=
+ ~ACPI_GPE_DISPATCH_MASK;
+ }
+ }
+ }
+
+ return_ACPI_STATUS(AE_OK);
+}
+
+#endif /* !ACPI_REDUCED_HARDWARE */
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