linux-kernel - [tip:x86/platform] x86/virt, x86/acpi: Add test for ACPI_FADT_NO

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Message-ID: <tip-6d7305254ea947d575a066711c3349fafbebaffa@git.kernel.org>
Date:   Fri, 10 Nov 2017 01:42:43 -0800
From:   tip-bot for Juergen Gross <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, hpa@...or.com, peterz@...radead.org,
        tglx@...utronix.de, jgross@...e.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip:x86/platform] x86/virt, x86/acpi: Add test for
 ACPI_FADT_NO_VGA

Commit-ID:  6d7305254ea947d575a066711c3349fafbebaffa
Gitweb:     https://git.kernel.org/tip/6d7305254ea947d575a066711c3349fafbebaffa
Author:     Juergen Gross <jgross@...e.com>
AuthorDate: Thu, 9 Nov 2017 14:27:37 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 10 Nov 2017 10:03:13 +0100

x86/virt, x86/acpi: Add test for ACPI_FADT_NO_VGA

Add a test for ACPI_FADT_NO_VGA when scanning the FADT and set the new
flag x86_platform.legacy.no_vga accordingly.

Signed-off-by: Juergen Gross <jgross@...e.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: len.brown@...el.com
Cc: linux-pm@...r.kernel.org
Cc: pavel@....cz
Cc: rjw@...ysocki.net
Link: http://lkml.kernel.org/r/20171109132739.23465-4-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/x86_init.h | 1 +
 arch/x86/kernel/acpi/boot.c     | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index ad15a0f..260e9a8 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -208,6 +208,7 @@ enum x86_legacy_i8042_state {
 struct x86_legacy_features {
 	enum x86_legacy_i8042_state i8042;
 	int rtc;
+	int no_vga;
 	int reserve_bios_regions;
 	struct x86_legacy_devices devices;
 };
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 079535e..ef9e02e 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -961,6 +961,11 @@ static int __init acpi_parse_fadt(struct acpi_table_header *table)
 		x86_platform.legacy.rtc = 0;
 	}
 
+	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
+		pr_debug("ACPI: probing for VGA not safe\n");
+		x86_platform.legacy.no_vga = 1;
+	}
+
 #ifdef CONFIG_X86_PM_TIMER
 	/* detect the location of the ACPI PM Timer */
 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {