1 files changed, 380 insertions, 0 deletions

diff --git a/drivers/acpi/utilities/utmutex.c b/drivers/acpi/utilities/utmutex.c
new file mode 100644
index 000000000000..a80b97cb2e56
--- /dev/null
+++ b/drivers/acpi/utilities/utmutex.c
@@ -0,0 +1,380 @@
+/*******************************************************************************
+ *
+ * Module Name: utmutex - local mutex support
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * 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>
+
+#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 < NUM_MUTEX; i++) {
+                status = acpi_ut_create_mutex (i);
+                if (ACPI_FAILURE (status)) {
+                        return_ACPI_STATUS (status);
+                }
+        }
+
+        status = acpi_os_create_lock (&acpi_gbl_gpe_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 < NUM_MUTEX; i++) {
+                (void) acpi_ut_delete_mutex (i);
+        }
+
+        acpi_os_delete_lock (acpi_gbl_gpe_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 > MAX_MUTEX) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        if (!acpi_gbl_mutex_info[mutex_id].mutex) {
+                status = acpi_os_create_semaphore (1, 1,
+                                  &acpi_gbl_mutex_info[mutex_id].mutex);
+                acpi_gbl_mutex_info[mutex_id].owner_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_status                     status;
+
+
+        ACPI_FUNCTION_TRACE_U32 ("ut_delete_mutex", mutex_id);
+
+
+        if (mutex_id > MAX_MUTEX) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        status = acpi_os_delete_semaphore (acpi_gbl_mutex_info[mutex_id].mutex);
+
+        acpi_gbl_mutex_info[mutex_id].mutex = NULL;
+        acpi_gbl_mutex_info[mutex_id].owner_id = ACPI_MUTEX_NOT_ACQUIRED;
+
+        return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * 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;
+        u32                             this_thread_id;
+
+
+        ACPI_FUNCTION_NAME ("ut_acquire_mutex");
+
+
+        if (mutex_id > 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 < MAX_MUTEX; i++) {
+                        if (acpi_gbl_mutex_info[i].owner_id == this_thread_id) {
+                                if (i == mutex_id) {
+                                        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                                "Mutex [%s] already acquired by this thread [%X]\n",
+                                                acpi_ut_get_mutex_name (mutex_id), this_thread_id));
+
+                                        return (AE_ALREADY_ACQUIRED);
+                                }
+
+                                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                        "Invalid acquire order: Thread %X owns [%s], wants [%s]\n",
+                                        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 %X attempting to acquire Mutex [%s]\n",
+                this_thread_id, acpi_ut_get_mutex_name (mutex_id)));
+
+        status = acpi_os_wait_semaphore (acpi_gbl_mutex_info[mutex_id].mutex,
+                           1, ACPI_WAIT_FOREVER);
+        if (ACPI_SUCCESS (status)) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X acquired Mutex [%s]\n",
+                        this_thread_id, acpi_ut_get_mutex_name (mutex_id)));
+
+                acpi_gbl_mutex_info[mutex_id].use_count++;
+                acpi_gbl_mutex_info[mutex_id].owner_id = this_thread_id;
+        }
+        else {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                        "Thread %X could not acquire Mutex [%s] %s\n",
+                                this_thread_id, acpi_ut_get_mutex_name (mutex_id),
+                                acpi_format_exception (status)));
+        }
+
+        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_status                     status;
+        u32                             this_thread_id;
+
+
+        ACPI_FUNCTION_NAME ("ut_release_mutex");
+
+
+        this_thread_id = acpi_os_get_thread_id ();
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
+                "Thread %X releasing Mutex [%s]\n", this_thread_id,
+                acpi_ut_get_mutex_name (mutex_id)));
+
+        if (mutex_id > MAX_MUTEX) {
+                return (AE_BAD_PARAMETER);
+        }
+
+        /*
+         * Mutex must be acquired in order to release it!
+         */
+        if (acpi_gbl_mutex_info[mutex_id].owner_id == ACPI_MUTEX_NOT_ACQUIRED) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                        "Mutex [%s] is not acquired, cannot release\n",
+                        acpi_ut_get_mutex_name (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 < MAX_MUTEX; i++) {
+                        if (acpi_gbl_mutex_info[i].owner_id == this_thread_id) {
+                                if (i == mutex_id) {
+                                        continue;
+                                }
+
+                                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                        "Invalid release order: owns [%s], releasing [%s]\n",
+                                        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].owner_id = ACPI_MUTEX_NOT_ACQUIRED;
+
+        status = acpi_os_signal_semaphore (acpi_gbl_mutex_info[mutex_id].mutex, 1);
+
+        if (ACPI_FAILURE (status)) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                        "Thread %X could not release Mutex [%s] %s\n",
+                        this_thread_id, acpi_ut_get_mutex_name (mutex_id),
+                        acpi_format_exception (status)));
+        }
+        else {
+                ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X released Mutex [%s]\n",
+                        this_thread_id, acpi_ut_get_mutex_name (mutex_id)));
+        }
+
+        return (status);
+}
+
+