linux-kernel - [PATCH 08/21] x86, acpi: Also initialize signature and length when parsing root table.

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Date:	Fri, 19 Jul 2013 15:59:21 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de,
	yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	izumi.taku@...fujitsu.com, mgorman@...e.de, minchan@...nel.org,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	riel@...hat.com, jweiner@...hat.com, prarit@...hat.com,
	zhangyanfei@...fujitsu.com, yanghy@...fujitsu.com
Cc:	x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: [PATCH 08/21] x86, acpi: Also initialize signature and length when parsing root table.

Besides the phys addr of the acpi tables, it will be very convenient if
we also have the signature of each table in acpi_gbl_root_table_list at
early time. We can find SRAT easily by comparing the signature.

This patch alse record signature and some other info in
acpi_gbl_root_table_list at early time.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 drivers/acpi/acpica/tbutils.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 9d68ffc..37cc5e4 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -514,6 +514,7 @@ acpi_tb_install_table(acpi_physical_address address,
 	 * fully mapped later (in verify table). In any case, we must
 	 * unmap the header that was mapped above.
 	 */
+	table_desc = &acpi_gbl_root_table_list.tables[table_index];
 	final_table = acpi_tb_table_override(table, table_desc);
 	if (!final_table) {
 		final_table = table;	/* There was no override */
@@ -627,6 +628,7 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
 	u32 i;
 	u32 table_count;
 	struct acpi_table_header *table;
+	struct acpi_table_desc *table_desc;
 	acpi_physical_address address;
 	acpi_physical_address uninitialized_var(rsdt_address);
 	u32 length;
@@ -766,6 +768,27 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
 	 */
 	acpi_os_unmap_memory(table, length);
 
+	/*
+	 * Also initialize the table entries here, so that later we can use them
+	 * to find SRAT at very eraly time to reserve hotpluggable memory.
+	 */
+	for (i = 2; i < table_count; i++) {
+		table = acpi_os_map_memory(
+				acpi_gbl_root_table_list.tables[i].address,
+				sizeof(struct acpi_table_header));
+		if (!table)
+			return_ACPI_STATUS(AE_NO_MEMORY);
+
+		table_desc = &acpi_gbl_root_table_list.tables[i];
+
+		table_desc->pointer = NULL;
+		table_desc->length = table->length;
+		table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED;
+		ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
+
+		acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+	}
+
 	return_ACPI_STATUS(AE_OK);
 }
 
-- 
1.7.1

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