linux-kernel - [PATCH 4/4] arm64: hibernate: Check for broadcast TLBI support

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Date:	Thu,  4 Aug 2016 11:15:17 +0200
From:	Matthias Brugger <mbrugger@...e.com>
To:	pbonzini@...hat.com, rkrcmar@...hat.com,
	christoffer.dall@...aro.org, marc.zyngier@....com,
	linux@...linux.org.uk, catalin.marinas@....com, will.deacon@....com
Cc:	suzuki.poulose@....com, james.morse@....com,
	david.daney@...ium.com, rrichter@...ium.com, agraf@...e.de,
	mbrugger@...e.com, mark.rutland@....com, lorenzo.pieralisi@....com,
	dave.long@...aro.org, ard.biesheuvel@...aro.org,
	zlim.lnx@...il.com, kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] arm64: hibernate: Check for broadcast TLBI support

Hibernation makes use of broadcast TLBI. Error out
early when this is not supported by the hardware.

Signed-off-by: Matthias Brugger <mbrugger@...e.com>
---
 arch/arm64/kernel/hibernate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 21ab5df..7269642 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -481,6 +481,11 @@ static int check_boot_cpu_online_pm_callback(struct notifier_block *nb,
 
 static int __init check_boot_cpu_online_init(void)
 {
+	if (cpus_have_cap(ARM64_HAS_NO_BCAST_TLBI)) {
+		pr_err("Can't hibernate: missing broadcast TLBI support.\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Set this pm_notifier callback with a lower priority than
 	 * cpu_hotplug_pm_callback, so that cpu_hotplug_pm_callback will be
-- 
2.6.6