1 files changed, 342 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c
new file mode 100644
index 000000000000..7b48ba3f3f8a
--- /dev/null
+++ b/drivers/acpi/acpica/utmutex.c
@@ -0,0 +1,342 @@
+/*******************************************************************************
+ *
+ * Module Name: utmutex - local mutex support
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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 <acpi/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 acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_mutex_initialize
+ *
+ * PARAMETERS:  None.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create the system mutex objects.
+ *
+ ******************************************************************************/
+
+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 */
+
+	spin_lock_init(acpi_gbl_gpe_lock);
+	spin_lock_init(acpi_gbl_hardware_lock);
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_mutex_terminate
+ *
+ * PARAMETERS:  None.
+ *
+ * RETURN:      None.
+ *
+ * DESCRIPTION: Delete all of the system mutex objects.
+ *
+ ******************************************************************************/
+
+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++) {
+		(void)acpi_ut_delete_mutex(i);
+	}
+
+	/* Delete the spinlocks */
+
+	acpi_os_delete_lock(acpi_gbl_gpe_lock);
+	acpi_os_delete_lock(acpi_gbl_hardware_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 (mutex_id > ACPI_MAX_MUTEX) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	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 acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
+{
+
+	ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
+
+	if (mutex_id > ACPI_MAX_MUTEX) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	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_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * 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 [%X]",
+						    acpi_ut_get_mutex_name
+						    (mutex_id),
+						    this_thread_id));
+
+					return (AE_ALREADY_ACQUIRED);
+				}
+
+				ACPI_ERROR((AE_INFO,
+					    "Invalid acquire order: Thread %X owns [%s], wants [%s]",
+					    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 %lX attempting to acquire Mutex [%s]\n",
+			  (unsigned long)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 %lX acquired Mutex [%s]\n",
+				  (unsigned long)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 %lX could not acquire Mutex [%X]",
+				(unsigned long)this_thread_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_thread_id this_thread_id;
+
+	ACPI_FUNCTION_NAME(ut_release_mutex);
+
+	this_thread_id = acpi_os_get_thread_id();
+	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
+			  "Thread %lX releasing Mutex [%s]\n",
+			  (unsigned long)this_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 [%X] is not acquired, cannot release",
+			    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 == this_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);
+}