linux-kernel - [PATCH 04/14] ACPI 2.0 / AML: Tune _REG evaluations order in the initialization steps

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Message-Id: <ef057117b2ad6733b4a008ce9e53a7252461c696.1454730659.git.lv.zheng@intel.com>
Date:	Sat,  6 Feb 2016 11:52:53 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: [PATCH 04/14] ACPI 2.0 / AML: Tune _REG evaluations order in the initialization steps

ACPICA commit 77e0c7a482ac30ef857cf3c33d075e5fe5b5e449

This patch tunes _REG evaluations to be later than all table loading
facilities:
1. acpi_load_tables(): _REG is currently invoked after this function.
2. acpi_ns_exec_module_code_list(): this executes module level code, the
   execution should be a part of the table loading while we currently
   support this in a deferred way.
3. acpi_ns_initialize_objects(): this parses Region/Field/Buffer/Package where
   pkg_length primitive can be seen in the grammar, the parsing should be a
   part of the table loading while we currently support this in a deferred
   way.
Control method evaluation should happen after loading the tables. So this
patch changes the order of _REG evaluation when
acpi_gbl_group_module_level_code experiment is enabled. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/77e0c7a4
Signed-off-by: Lv Zheng <lv.zheng@...el.com>
---
 drivers/acpi/acpica/utxfinit.c |   35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/acpica/utxfinit.c b/drivers/acpi/acpica/utxfinit.c
index 22f50c2..2caaec7 100644
--- a/drivers/acpi/acpica/utxfinit.c
+++ b/drivers/acpi/acpica/utxfinit.c
@@ -262,23 +262,6 @@ acpi_status __init acpi_initialize_objects(u32 flags)
 
 	ACPI_FUNCTION_TRACE(acpi_initialize_objects);
 
-	/*
-	 * Run all _REG methods
-	 *
-	 * Note: Any objects accessed by the _REG methods will be automatically
-	 * initialized, even if they contain executable AML (see the call to
-	 * acpi_ns_initialize_objects below).
-	 */
-	acpi_gbl_reg_methods_enabled = TRUE;
-	if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
-		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
-				  "[Init] Executing _REG OpRegion methods\n"));
-
-		status = acpi_ev_initialize_op_regions();
-		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
-		}
-	}
 #ifdef ACPI_EXEC_APP
 	/*
 	 * This call implements the "initialization file" option for acpi_exec.
@@ -319,6 +302,24 @@ acpi_status __init acpi_initialize_objects(u32 flags)
 	}
 
 	/*
+	 * Run all _REG methods
+	 *
+	 * Note: Any objects accessed by the _REG methods will be automatically
+	 * initialized, even if they contain executable AML (see the call to
+	 * acpi_ns_initialize_objects below).
+	 */
+	acpi_gbl_reg_methods_enabled = TRUE;
+	if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "[Init] Executing _REG OpRegion methods\n"));
+
+		status = acpi_ev_initialize_op_regions();
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	}
+
+	/*
 	 * Initialize all device objects in the namespace. This runs the device
 	 * _STA and _INI methods.
 	 */
-- 
1.7.10