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Message-ID: <23e0a29faad5a9cc43582ba7d40a3073f2fb8c87.camel@infradead.org>
Subject: Re: [PATCH v3 19/35] x86/io_apic: Cleanup trigger/polarity helpers
From:   David Woodhouse <dwmw2@infradead.org>
To:     Qian Cai <cai@redhat.com>, x86@kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Tom Murphy <murphyt7@tcd.ie>
Cc:     kvm <kvm@vger.kernel.org>, iommu@lists.linux-foundation.org,
        joro@8bytes.org, Paolo Bonzini <pbonzini@redhat.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-hyperv@vger.kernel.org, maz@misterjones.org,
        Dexuan Cui <decui@microsoft.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Date:   Tue, 10 Nov 2020 08:59:17 +0000
In-Reply-To: <085029af45f045dcf5b7fb2173d560421b00b44d.camel@redhat.com>
References: <e6601ff691afb3266e365a91e8b221179daf22c2.camel@infradead.org>
         <20201024213535.443185-1-dwmw2@infradead.org>
         <20201024213535.443185-20-dwmw2@infradead.org>
         <085029af45f045dcf5b7fb2173d560421b00b44d.camel@redhat.com>
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On Tue, 2020-11-10 at 01:31 -0500, Qian Cai wrote:
> On Sat, 2020-10-24 at 22:35 +0100, David Woodhouse wrote:
> > From: Thomas Gleixner <tglx@linutronix.de>
> >=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
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> > Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
> > ---
> >   arch/x86/include/asm/hw_irq.h       |   6 +-
> >   arch/x86/kernel/apic/io_apic.c      | 244 +++++++++++++--------------=
-
> >   arch/x86/pci/intel_mid_pci.c        |   8 +-
> >   drivers/iommu/amd/iommu.c           |  10 +-
> >   drivers/iommu/intel/irq_remapping.c |   9 +-
> >   5 files changed, 130 insertions(+), 147 deletions(-)
>=20
> Reverting the rest of patchset up to this commit on next-20201109 fixed a=
n
> endless soft-lockups issue booting an AMD server below. I noticed that th=
e
> failed boots always has this IOMMU IO_PAGE_FAULT before those soft-lockup=
s:

Hm, attempting to reproduce this shows something else. Ever since
commit be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-
iommu api") in 5.5 the following stops working for me:

$ qemu-system-x86_64 -serial mon:stdio -kernel bzImage  -machine q35,accel=
=3Dkvm,kernel-irqchip=3Dsplit -m 2G -device amd-iommu,intremap=3Doff -appen=
d "console=3DttyS0 apic=3Dverbose debug" -display none

It hasn't got a hard drive but I can watch the SATA interrupts fail as
it probes the CD-ROM:

[    7.403327] ata3.00: qc timeout (cmd 0xa1)
[    7.405980] ata3.00: failed to IDENTIFY (I/O error, err_mask=3D0x4)

Adding 'iommu=3Doff' to the kernel command line makes it work again, in
that it correctly panics at the lack of a root file system, quickly.


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