[PATCH 11/50] ACPI 5.0: New interfaces to allow driver access to AMLmutex objects
From: Len Brown
Date: Tue Jan 17 2012 - 08:25:24 EST
From: Lin Ming <ming.m.lin@xxxxxxxxx>
Adds acpi_acquire_mutex, acpi_release_mutex external interfaces.
New file, utxfmutex.c.
Signed-off-by: Lin Ming <ming.m.lin@xxxxxxxxx>
Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
drivers/acpi/acpica/Makefile | 2 +-
drivers/acpi/acpica/utxfmutex.c | 187 +++++++++++++++++++++++++++++++++++++++
include/acpi/acpixf.h | 15 +++-
3 files changed, 201 insertions(+), 3 deletions(-)
create mode 100644 drivers/acpi/acpica/utxfmutex.c
diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
index 301bd2d..1bd4661 100644
--- a/drivers/acpi/acpica/Makefile
+++ b/drivers/acpi/acpica/Makefile
@@ -45,4 +45,4 @@ acpi-y += tbxface.o tbinstal.o tbutils.o tbfind.o tbfadt.o tbxfroot.o
acpi-y += utalloc.o utdebug.o uteval.o utinit.o utmisc.o utxface.o \
utcopy.o utdelete.o utglobal.o utmath.o utobject.o \
utstate.o utmutex.o utobject.o utresrc.o utlock.o utids.o \
- utosi.o utxferror.o utdecode.o
+ utosi.o utxferror.o utdecode.o utxfmutex.o
diff --git a/drivers/acpi/acpica/utxfmutex.c b/drivers/acpi/acpica/utxfmutex.c
new file mode 100644
index 0000000..1ea016b
--- /dev/null
+++ b/drivers/acpi/acpica/utxfmutex.c
@@ -0,0 +1,187 @@
+/*******************************************************************************
+ *
+ * Module Name: utxfmutex - external AML mutex access functions
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2011, 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 "accommon.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_UTILITIES
+ACPI_MODULE_NAME("utxfmutex")
+
+/* Local prototypes */
+static acpi_status
+acpi_ut_get_mutex_object(acpi_handle handle,
+ acpi_string pathname,
+ union acpi_operand_object **ret_obj);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_get_mutex_object
+ *
+ * PARAMETERS: Handle - Mutex or prefix handle (optional)
+ * Pathname - Mutex pathname (optional)
+ * ret_obj - Where the mutex object is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by
+ * Handle:Pathname. Either Handle or Pathname can be NULL, but
+ * not both.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ut_get_mutex_object(acpi_handle handle,
+ acpi_string pathname,
+ union acpi_operand_object **ret_obj)
+{
+ struct acpi_namespace_node *mutex_node;
+ union acpi_operand_object *mutex_obj;
+ acpi_status status;
+
+ /* Parameter validation */
+
+ if (!ret_obj || (!handle && !pathname)) {
+ return (AE_BAD_PARAMETER);
+ }
+
+ /* Get a the namespace node for the mutex */
+
+ mutex_node = handle;
+ if (pathname != NULL) {
+ status = acpi_get_handle(handle, pathname,
+ ACPI_CAST_PTR(acpi_handle,
+ &mutex_node));
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ }
+
+ /* Ensure that we actually have a Mutex object */
+
+ if (!mutex_node || (mutex_node->type != ACPI_TYPE_MUTEX)) {
+ return (AE_TYPE);
+ }
+
+ /* Get the low-level mutex object */
+
+ mutex_obj = acpi_ns_get_attached_object(mutex_node);
+ if (!mutex_obj) {
+ return (AE_NULL_OBJECT);
+ }
+
+ *ret_obj = mutex_obj;
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_acquire_mutex
+ *
+ * PARAMETERS: Handle - Mutex or prefix handle (optional)
+ * Pathname - Mutex pathname (optional)
+ * Timeout - Max time to wait for the lock (millisec)
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Acquire an AML mutex. This is a device driver interface to
+ * AML mutex objects, and allows for transaction locking between
+ * drivers and AML code. The mutex node is pointed to by
+ * Handle:Pathname. Either Handle or Pathname can be NULL, but
+ * not both.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_acquire_mutex(acpi_handle handle, acpi_string pathname, u16 timeout)
+{
+ acpi_status status;
+ union acpi_operand_object *mutex_obj;
+
+ /* Get the low-level mutex associated with Handle:Pathname */
+
+ status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ /* Acquire the OS mutex */
+
+ status = acpi_os_acquire_mutex(mutex_obj->mutex.os_mutex, timeout);
+ return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_release_mutex
+ *
+ * PARAMETERS: Handle - Mutex or prefix handle (optional)
+ * Pathname - Mutex pathname (optional)
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Release an AML mutex. This is a device driver interface to
+ * AML mutex objects, and allows for transaction locking between
+ * drivers and AML code. The mutex node is pointed to by
+ * Handle:Pathname. Either Handle or Pathname can be NULL, but
+ * not both.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_release_mutex(acpi_handle handle, acpi_string pathname)
+{
+ acpi_status status;
+ union acpi_operand_object *mutex_obj;
+
+ /* Get the low-level mutex associated with Handle:Pathname */
+
+ status = acpi_ut_get_mutex_object(handle, pathname, &mutex_obj);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ /* Release the OS mutex */
+
+ acpi_os_release_mutex(mutex_obj->mutex.os_mutex);
+ return (AE_OK);
+}
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 9ba2e3a..dd86610 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -277,12 +277,23 @@ acpi_status acpi_install_exception_handler(acpi_exception_handler handler);
acpi_status acpi_install_interface_handler(acpi_interface_handler handler);
/*
- * Event interfaces
+ * Global Lock interfaces
*/
acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle);
acpi_status acpi_release_global_lock(u32 handle);
+/*
+ * Interfaces to AML mutex objects
+ */
+acpi_status
+acpi_acquire_mutex(acpi_handle handle, acpi_string pathname, u16 timeout);
+
+acpi_status acpi_release_mutex(acpi_handle handle, acpi_string pathname);
+
+/*
+ * Fixed Event interfaces
+ */
acpi_status acpi_enable_event(u32 event, u32 flags);
acpi_status acpi_disable_event(u32 event, u32 flags);
@@ -292,7 +303,7 @@ acpi_status acpi_clear_event(u32 event);
acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status);
/*
- * GPE Interfaces
+ * General Purpose Event (GPE) Interfaces
*/
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number);
--
1.7.9.rc1
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