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Message-ID: <088051dff3012035e468b0cb5dcc8cb488b7d292.camel@infradead.org>
Subject: Re: [EXTERNAL] [tip: x86/apic] x86/io_apic: Cleanup
 trigger/polarity helpers
From:   David Woodhouse <dwmw2@infradead.org>
To:     Tom Lendacky <thomas.lendacky@amd.com>,
        linux-kernel@vger.kernel.org
Cc:     Thomas Gleixner <tglx@linutronix.de>, x86 <x86@kernel.org>
Date:   Tue, 10 Nov 2020 03:30:30 +0000
In-Reply-To: <e2e06979-cbcf-8771-0b48-c46f2d034aa8@amd.com>
References: <20201024213535.443185-20-dwmw2@infradead.org>
         <160397373817.397.3191135882528008704.tip-bot2@tip-bot2>
         <e2e06979-cbcf-8771-0b48-c46f2d034aa8@amd.com>
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On Mon, 2020-11-09 at 17:15 -0600, Tom Lendacky wrote:
> On 10/29/20 7:15 AM, tip-bot2 for Thomas Gleixner wrote:
> > The following commit has been merged into the x86/apic branch of tip:
> >=20
> > Commit-ID:     a27dca645d2c0f31abb7858aa0e10b2fa0f2f659
> > Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.=
git/commit/?id=3Da27dca645d2c0f31abb7858aa0e10b2fa0f2f659
> > Author:        Thomas Gleixner <tglx@linutronix.de>
> > AuthorDate:    Sat, 24 Oct 2020 22:35:19 +01:00
> > Committer:     Thomas Gleixner <tglx@linutronix.de>
> > CommitterDate: Wed, 28 Oct 2020 20:26:26 +01:00
> >=20
> > x86/io_apic: Cleanup trigger/polarity helpers
> >=20
> > 'trigger' and 'polarity' are used throughout the I/O-APIC code for hand=
ling
> > the trigger type (edge/level) and the active low/high configuration. Wh=
ile
> > there are defines for initializing these variables and struct members, =
they
> > are not used consequently and the meaning of 'trigger' and 'polarity' i=
s
> > opaque and confusing at best.
> >=20
> > Rename them to 'is_level' and 'active_low' and make them boolean in var=
ious
> > structs so it's entirely clear what the meaning is.
>=20
> Running the tip tree on my second generation EPYC system I'm seeing lots
> of the following:
>=20
> [  105.325371] hpet: Lost 9601 RTC interrupts
> [  105.485766] hpet: Lost 9600 RTC interrupts
> [  105.639182] hpet: Lost 9601 RTC interrupts
> [  105.792155] hpet: Lost 9601 RTC interrupts
> [  105.947076] hpet: Lost 9601 RTC interrupts
> [  106.100876] hpet: Lost 9600 RTC interrupts
> [  106.253444] hpet: Lost 9601 RTC interrupts
> [  106.406722] hpet: Lost 9601 RTC interrupts
>=20
> preventing the system from booting. I bisected it to this commit.
>=20
> Additionally, I'm seeing warnings and error messages (which I haven't
> bisected, yet) along these lines:
>=20
> [   12.790801] WARNING: CPU: 135 PID: 1 at arch/x86/kernel/apic/apic.c:25=
05 __irq_msi_compose_msg+0x79/0x80
> [   98.121716] irq 3: nobody cared (try booting with the "irqpoll" option=
)
> [  100.692087] irq 15: nobody cared (try booting with the "irqpoll" optio=
n)
> [  100.800217] irq 11: nobody cared (try booting with the "irqpoll" optio=
n)
> [  100.800407] irq 10: nobody cared (try booting with the "irqpoll" optio=
n)

Odd. The warning suggests we're asking __irq_msi_compose_msg() to
compose an MSI targeted at an APIC ID above 255, which shouldn't ever
happen.

Can we see a full boot log with apic=3Dverbose please?=20

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