summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/utmutex.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/acpica/utmutex.c')
-rw-r--r--drivers/acpi/acpica/utmutex.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c
new file mode 100644
index 0000000..eee676d
--- /dev/null
+++ b/drivers/acpi/acpica/utmutex.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*******************************************************************************
+ *
+ * Module Name: utmutex - local mutex support
+ *
+ ******************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT ACPI_UTILITIES
+ACPI_MODULE_NAME("utmutex")
+/* Local prototypes */
+static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
+
+static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_mutex_initialize
+ *
+ * PARAMETERS: None.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Create the system mutex objects. This includes mutexes,
+ * spin locks, and reader/writer locks.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_mutex_initialize(void)
+{
+ u32 i;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ut_mutex_initialize);
+
+ /* Create each of the predefined mutex objects */
+
+ for (i = 0; i < ACPI_NUM_MUTEX; i++) {
+ status = acpi_ut_create_mutex(i);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ /* Create the spinlocks for use at interrupt level or for speed */
+
+ status = acpi_os_create_lock(&acpi_gbl_gpe_lock);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ status = acpi_os_create_lock(&acpi_gbl_hardware_lock);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ status = acpi_os_create_lock(&acpi_gbl_reference_count_lock);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Mutex for _OSI support */
+
+ status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Create the reader/writer lock for namespace access */
+
+ status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_mutex_terminate
+ *
+ * PARAMETERS: None.
+ *
+ * RETURN: None.
+ *
+ * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
+ * spin locks, and reader/writer locks.
+ *
+ ******************************************************************************/
+
+void acpi_ut_mutex_terminate(void)
+{
+ u32 i;
+
+ ACPI_FUNCTION_TRACE(ut_mutex_terminate);
+
+ /* Delete each predefined mutex object */
+
+ for (i = 0; i < ACPI_NUM_MUTEX; i++) {
+ acpi_ut_delete_mutex(i);
+ }
+
+ acpi_os_delete_mutex(acpi_gbl_osi_mutex);
+
+ /* Delete the spinlocks */
+
+ acpi_os_delete_lock(acpi_gbl_gpe_lock);
+ acpi_os_delete_lock(acpi_gbl_hardware_lock);
+ acpi_os_delete_lock(acpi_gbl_reference_count_lock);
+
+ /* Delete the reader/writer lock */
+
+ acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
+ return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_create_mutex
+ *
+ * PARAMETERS: mutex_ID - ID of the mutex to be created
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Create a mutex object.
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
+{
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
+
+ if (!acpi_gbl_mutex_info[mutex_id].mutex) {
+ status =
+ acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
+ acpi_gbl_mutex_info[mutex_id].thread_id =
+ ACPI_MUTEX_NOT_ACQUIRED;
+ acpi_gbl_mutex_info[mutex_id].use_count = 0;
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_delete_mutex
+ *
+ * PARAMETERS: mutex_ID - ID of the mutex to be deleted
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Delete a mutex object.
+ *
+ ******************************************************************************/
+
+static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
+{
+
+ ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
+
+ acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
+
+ acpi_gbl_mutex_info[mutex_id].mutex = NULL;
+ acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
+
+ return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_acquire_mutex
+ *
+ * PARAMETERS: mutex_ID - ID of the mutex to be acquired
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Acquire a mutex object.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
+{
+ acpi_status status;
+ acpi_thread_id this_thread_id;
+
+ ACPI_FUNCTION_NAME(ut_acquire_mutex);
+
+ if (mutex_id > ACPI_MAX_MUTEX) {
+ return (AE_BAD_PARAMETER);
+ }
+
+ this_thread_id = acpi_os_get_thread_id();
+
+#ifdef ACPI_MUTEX_DEBUG
+ {
+ u32 i;
+ /*
+ * Mutex debug code, for internal debugging only.
+ *
+ * Deadlock prevention. Check if this thread owns any mutexes of value
+ * greater than or equal to this one. If so, the thread has violated
+ * the mutex ordering rule. This indicates a coding error somewhere in
+ * the ACPI subsystem code.
+ */
+ for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
+ if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
+ if (i == mutex_id) {
+ ACPI_ERROR((AE_INFO,
+ "Mutex [%s] already acquired by this thread [%u]",
+ acpi_ut_get_mutex_name
+ (mutex_id),
+ (u32)this_thread_id));
+
+ return (AE_ALREADY_ACQUIRED);
+ }
+
+ ACPI_ERROR((AE_INFO,
+ "Invalid acquire order: Thread %u owns [%s], wants [%s]",
+ (u32)this_thread_id,
+ acpi_ut_get_mutex_name(i),
+ acpi_ut_get_mutex_name(mutex_id)));
+
+ return (AE_ACQUIRE_DEADLOCK);
+ }
+ }
+ }
+#endif
+
+ ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
+ "Thread %u attempting to acquire Mutex [%s]\n",
+ (u32)this_thread_id,
+ acpi_ut_get_mutex_name(mutex_id)));
+
+ status =
+ acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
+ ACPI_WAIT_FOREVER);
+ if (ACPI_SUCCESS(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
+ "Thread %u acquired Mutex [%s]\n",
+ (u32)this_thread_id,
+ acpi_ut_get_mutex_name(mutex_id)));
+
+ acpi_gbl_mutex_info[mutex_id].use_count++;
+ acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
+ } else {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Thread %u could not acquire Mutex [%s] (0x%X)",
+ (u32)this_thread_id,
+ acpi_ut_get_mutex_name(mutex_id), mutex_id));
+ }
+
+ return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_release_mutex
+ *
+ * PARAMETERS: mutex_ID - ID of the mutex to be released
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Release a mutex object.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
+{
+ ACPI_FUNCTION_NAME(ut_release_mutex);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
+ (u32)acpi_os_get_thread_id(),
+ acpi_ut_get_mutex_name(mutex_id)));
+
+ if (mutex_id > ACPI_MAX_MUTEX) {
+ return (AE_BAD_PARAMETER);
+ }
+
+ /*
+ * Mutex must be acquired in order to release it!
+ */
+ if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
+ ACPI_ERROR((AE_INFO,
+ "Mutex [%s] (0x%X) is not acquired, cannot release",
+ acpi_ut_get_mutex_name(mutex_id), mutex_id));
+
+ return (AE_NOT_ACQUIRED);
+ }
+#ifdef ACPI_MUTEX_DEBUG
+ {
+ u32 i;
+ /*
+ * Mutex debug code, for internal debugging only.
+ *
+ * Deadlock prevention. Check if this thread owns any mutexes of value
+ * greater than this one. If so, the thread has violated the mutex
+ * ordering rule. This indicates a coding error somewhere in
+ * the ACPI subsystem code.
+ */
+ for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
+ if (acpi_gbl_mutex_info[i].thread_id ==
+ acpi_os_get_thread_id()) {
+ if (i == mutex_id) {
+ continue;
+ }
+
+ ACPI_ERROR((AE_INFO,
+ "Invalid release order: owns [%s], releasing [%s]",
+ acpi_ut_get_mutex_name(i),
+ acpi_ut_get_mutex_name(mutex_id)));
+
+ return (AE_RELEASE_DEADLOCK);
+ }
+ }
+ }
+#endif
+
+ /* Mark unlocked FIRST */
+
+ acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
+
+ acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
+ return (AE_OK);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-26 00:31:49 +0000