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);
+}