linux-kernel - [tip:x86/boot] x86/ACPI: Parse ACPI_FADT_LEGACY

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Message-ID: <tip-7a17b82ccd6671a4bb436df52eedeff906b02735@git.kernel.org>
Date:	Fri, 22 Apr 2016 02:53:24 -0700
From:	"tip-bot for Luis R. Rodriguez" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mcgrof@...nel.org, bp@...en8.de, brgerst@...il.com,
	linux-kernel@...r.kernel.org, dvlasenk@...hat.com, hpa@...or.com,
	luto@...capital.net, torvalds@...ux-foundation.org,
	mingo@...nel.org, tglx@...utronix.de, peterz@...radead.org
Subject: [tip:x86/boot] x86/ACPI: Parse ACPI_FADT_LEGACY_DEVICES

Commit-ID:  7a17b82ccd6671a4bb436df52eedeff906b02735
Gitweb:     http://git.kernel.org/tip/7a17b82ccd6671a4bb436df52eedeff906b02735
Author:     Luis R. Rodriguez <mcgrof@...nel.org>
AuthorDate: Wed, 13 Apr 2016 17:04:42 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 22 Apr 2016 10:29:06 +0200

x86/ACPI: Parse ACPI_FADT_LEGACY_DEVICES

ACPI 5.2.9.3 IA-PC Boot Architecture flag ACPI_FADT_LEGACY_DEVICES
can be used to determine if a system has legacy devices LPC or
ISA devices. The x86 platform already has a struct which lists
known associated legacy devices, we start off careful only
by disabling root devices we should not regress with. The struct
and device list can be expanded with time to cover more root
legacy components.

Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: andrew.cooper3@...rix.com
Cc: andriy.shevchenko@...ux.intel.com
Cc: bigeasy@...utronix.de
Cc: boris.ostrovsky@...cle.com
Cc: david.vrabel@...rix.com
Cc: ffainelli@...ebox.fr
Cc: george.dunlap@...rix.com
Cc: glin@...e.com
Cc: jgross@...e.com
Cc: jlee@...e.com
Cc: josh@...htriplett.org
Cc: julien.grall@...aro.org
Cc: konrad.wilk@...cle.com
Cc: kozerkov@...allels.com
Cc: lenb@...nel.org
Cc: lguest@...ts.ozlabs.org
Cc: linux-acpi@...r.kernel.org
Cc: lv.zheng@...el.com
Cc: matt@...eblueprint.co.uk
Cc: mbizon@...ebox.fr
Cc: rjw@...ysocki.net
Cc: robert.moore@...el.com
Cc: rusty@...tcorp.com.au
Cc: tiwai@...e.de
Cc: toshi.kani@...com
Cc: xen-devel@...ts.xensource.com
Link: http://lkml.kernel.org/r/1460592286-300-13-git-send-email-mcgrof@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/acpi/boot.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 8c9c2bd..c9a06e5 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -913,6 +913,11 @@ late_initcall(hpet_insert_resource);
 
 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 {
+	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
+		pr_debug("ACPI: no legacy devices present\n");
+		x86_platform.legacy.devices.pnpbios = 0;
+	}
+
 	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
 		pr_debug("ACPI: not registering RTC platform device\n");
 		x86_platform.legacy.rtc = 0;