ACPICA: Re-implement interpreters' "serialized mode"

Enhanced the implementation of the interpreters'
serialized mode (boot with "acpi_serialize" to set
acpi_glb_all_methods_serialized flag.)
When this mode is specified, instead of creating a serialization
semaphore per control method, the interpreter lock is
simply no longer released before a blocking operation
during control method execution. This effectively makes
the AML Interpreter single-threaded. The overhead of a
semaphore per-method is eliminated.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 95 insertions, 48 deletions

diff --git a/drivers/acpi/executer/excreate.c b/drivers/acpi/executer/excreate.c
index a4d29b2d086f..c665aa776f83 100644
--- a/drivers/acpi/executer/excreate.c
+++ b/drivers/acpi/executer/excreate.c
@@ -583,10 +583,7 @@ acpi_ex_create_method(u8 * aml_start,
 	 * Get the sync_level. If method is serialized, a mutex will be
 	 * created for this method when it is parsed.
 	 */
-	if (acpi_gbl_all_methods_serialized) {
-		obj_desc->method.sync_level = 0;
-		obj_desc->method.method_flags |= AML_METHOD_SERIALIZED;
-	} else if (method_flags & AML_METHOD_SERIALIZED) {
+	if (method_flags & AML_METHOD_SERIALIZED) {
 		/*
 		 * ACPI 1.0: sync_level = 0
 		 * ACPI 2.0: sync_level = sync_level in method declaration
diff --git a/drivers/acpi/executer/exsystem.c b/drivers/acpi/executer/exsystem.c
index 3b9736a3e1b7..7e5aeb17cdc6 100644
--- a/drivers/acpi/executer/exsystem.c
+++ b/drivers/acpi/executer/exsystem.c
@@ -66,7 +66,6 @@ ACPI_MODULE_NAME("exsystem")
 acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 {
 	acpi_status status;
-	acpi_status status2;
 
 	ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
 
@@ -79,7 +78,7 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 
 		/* We must wait, so unlock the interpreter */
 
-		acpi_ex_exit_interpreter();
+		acpi_ex_relinquish_interpreter();
 
 		status = acpi_os_wait_semaphore(semaphore, 1, timeout);
 
@@ -89,13 +88,7 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 
 		/* Reacquire the interpreter */
 
-		status2 = acpi_ex_enter_interpreter();
-		if (ACPI_FAILURE(status2)) {
-
-			/* Report fatal error, could not acquire interpreter */
-
-			return_ACPI_STATUS(status2);
-		}
+		acpi_ex_reacquire_interpreter();
 	}
 
 	return_ACPI_STATUS(status);
@@ -119,7 +112,6 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
 {
 	acpi_status status;
-	acpi_status status2;
 
 	ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
 
@@ -132,7 +124,7 @@ acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
 
 		/* We must wait, so unlock the interpreter */
 
-		acpi_ex_exit_interpreter();
+		acpi_ex_relinquish_interpreter();
 
 		status = acpi_os_acquire_mutex(mutex, timeout);
 
@@ -142,13 +134,7 @@ acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
 
 		/* Reacquire the interpreter */
 
-		status2 = acpi_ex_enter_interpreter();
-		if (ACPI_FAILURE(status2)) {
-
-			/* Report fatal error, could not acquire interpreter */
-
-			return_ACPI_STATUS(status2);
-		}
+		acpi_ex_reacquire_interpreter();
 	}
 
 	return_ACPI_STATUS(status);
@@ -209,20 +195,18 @@ acpi_status acpi_ex_system_do_stall(u32 how_long)
 
 acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
 {
-	acpi_status status;
-
 	ACPI_FUNCTION_ENTRY();
 
 	/* Since this thread will sleep, we must release the interpreter */
 
-	acpi_ex_exit_interpreter();
+	acpi_ex_relinquish_interpreter();
 
 	acpi_os_sleep(how_long);
 
 	/* And now we must get the interpreter again */
 
-	status = acpi_ex_enter_interpreter();
-	return (status);
+	acpi_ex_reacquire_interpreter();
+	return (AE_OK);
 }
 
 /*******************************************************************************
diff --git a/drivers/acpi/executer/exutils.c b/drivers/acpi/executer/exutils.c
index 982c8b65876f..72adcf44afbb 100644
--- a/drivers/acpi/executer/exutils.c
+++ b/drivers/acpi/executer/exutils.c
@@ -76,46 +76,72 @@ static u32 acpi_ex_digits_needed(acpi_integer value, u32 base);
  *
  * PARAMETERS:  None
  *
- * RETURN:      Status
+ * RETURN:      None
  *
- * DESCRIPTION: Enter the interpreter execution region.  Failure to enter
- *              the interpreter region is a fatal system error
+ * DESCRIPTION: Enter the interpreter execution region. Failure to enter
+ *              the interpreter region is a fatal system error. Used in
+ *              conjunction with exit_interpreter.
  *
  ******************************************************************************/
 
-acpi_status acpi_ex_enter_interpreter(void)
+void acpi_ex_enter_interpreter(void)
 {
 	acpi_status status;
 
-	ACPI_FUNCTION_TRACE(ex_enter_interpreter);
+	ACPI_FUNCTION_TRACE(ex_reacquire_interpreter);
 
 	status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 	if (ACPI_FAILURE(status)) {
-		ACPI_ERROR((AE_INFO, "Could not acquire interpreter mutex"));
+		ACPI_ERROR((AE_INFO,
+			    "Could not acquire AML Interpreter mutex"));
 	}
 
-	return_ACPI_STATUS(status);
+	return_VOID;
 }
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_ex_exit_interpreter
+ * FUNCTION:    acpi_ex_reacquire_interpreter
  *
  * PARAMETERS:  None
  *
  * RETURN:      None
  *
- * DESCRIPTION: Exit the interpreter execution region
+ * DESCRIPTION: Reacquire the interpreter execution region from within the
+ *              interpreter code. Failure to enter the interpreter region is a
+ *              fatal system error. Used in  conjuction with
+ *              relinquish_interpreter
+ *
+ ******************************************************************************/
+
+void acpi_ex_reacquire_interpreter(void)
+{
+
+	ACPI_FUNCTION_TRACE(ex_reacquire_interpreter);
+
+	/*
+	 * If the global serialized flag is set, do not release the interpreter,
+	 * since it was not actually released by acpi_ex_relinquish_interpreter.
+	 * This forces the interpreter to be single threaded.
+	 */
+	if (!acpi_gbl_all_methods_serialized) {
+		acpi_ex_enter_interpreter();
+	}
+
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_exit_interpreter
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
  *
- * Cases where the interpreter is unlocked:
- *      1) Completion of the execution of a control method
- *      2) Method blocked on a Sleep() AML opcode
- *      3) Method blocked on an Acquire() AML opcode
- *      4) Method blocked on a Wait() AML opcode
- *      5) Method blocked to acquire the global lock
- *      6) Method blocked to execute a serialized control method that is
- *          already executing
- *      7) About to invoke a user-installed opregion handler
+ * DESCRIPTION: Exit the interpreter execution region. This is the top level
+ *              routine used to exit the interpreter when all processing has
+ *              been completed.
  *
  ******************************************************************************/
 
@@ -127,7 +153,47 @@ void acpi_ex_exit_interpreter(void)
 
 	status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 	if (ACPI_FAILURE(status)) {
-		ACPI_ERROR((AE_INFO, "Could not release interpreter mutex"));
+		ACPI_ERROR((AE_INFO,
+			    "Could not release AML Interpreter mutex"));
+	}
+
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_relinquish_interpreter
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Exit the interpreter execution region, from within the
+ *              interpreter - before attempting an operation that will possibly
+ *              block the running thread.
+ *
+ * Cases where the interpreter is unlocked internally
+ *      1) Method to be blocked on a Sleep() AML opcode
+ *      2) Method to be blocked on an Acquire() AML opcode
+ *      3) Method to be blocked on a Wait() AML opcode
+ *      4) Method to be blocked to acquire the global lock
+ *      5) Method to be blocked waiting to execute a serialized control method
+ *          that is currently executing
+ *      6) About to invoke a user-installed opregion handler
+ *
+ ******************************************************************************/
+
+void acpi_ex_relinquish_interpreter(void)
+{
+
+	ACPI_FUNCTION_TRACE(ex_relinquish_interpreter);
+
+	/*
+	 * If the global serialized flag is set, do not release the interpreter.
+	 * This forces the interpreter to be single threaded.
+	 */
+	if (!acpi_gbl_all_methods_serialized) {
+		acpi_ex_exit_interpreter();
 	}
 
 	return_VOID;
@@ -141,8 +207,8 @@ void acpi_ex_exit_interpreter(void)
  *
  * RETURN:      none
  *
- * DESCRIPTION: Truncate a number to 32-bits if the currently executing method
- *              belongs to a 32-bit ACPI table.
+ * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
+ *              32-bit, as determined by the revision of the DSDT.
  *
  ******************************************************************************/