linux-kernel - Re: [RFC PATCH v3 5/5] arm64: Use SYSTEM_OFF2 PSCI call to power off for hibernate

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Date: Fri, 22 Mar 2024 16:55:04 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: Marc Zyngier <maz@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org, Paolo Bonzini
 <pbonzini@...hat.com>, Jonathan Corbet <corbet@....net>, Oliver Upton
 <oliver.upton@...ux.dev>, James Morse <james.morse@....com>, Suzuki K
 Poulose <suzuki.poulose@....com>, Zenghui Yu <yuzenghui@...wei.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Lorenzo Pieralisi
 <lpieralisi@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown
 <len.brown@...el.com>, Pavel Machek <pavel@....cz>, Mostafa Saleh
 <smostafa@...gle.com>, Jean-Philippe Brucker <jean-philippe@...aro.org>, 
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 kvmarm@...ts.linux.dev,  linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH v3 5/5] arm64: Use SYSTEM_OFF2 PSCI call to power
 off for hibernate

On Fri, 2024-03-22 at 16:37 +0000, Marc Zyngier wrote:
> 
> I agree that nothing really breaks, but I also hold the view that
> broken firmware implementations should be given the finger, specially
> given that you have done this work *ahead* of the spec. I would really
> like this to fail immediately on these and not even try to suspend.
> 
> With that in mind, if doesn't really matter whether HIBERNATE_OFF is
> mandatory or not. We really should check for it and pretend it doesn't
> exist if the correct flag isn't set.

Ack.

I'll rename that variable to 'psci_system_off2_hibernate_supported' then.

static void __init psci_init_system_off2(void)
{
	int ret;

	ret = psci_features(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2));
	if (ret < 0)
		return;

	if (ret & (1 << PSCI_1_3_HIBERNATE_TYPE_OFF))
		psci_system_off2_hibernate_supported = true;
}

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