linux-kernel - Re: [PATCH] PCI/LINK: bw_notification: Do not leave interrupt handler NULL

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Message-ID: <20190319200044.GE24176@localhost.localdomain>
Date:   Tue, 19 Mar 2019 14:00:44 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Alexandru Gagniuc <mr.nuke.me@...il.com>
Cc:     bhelgaas@...gle.com, austin_bolen@...l.com,
        alex_gagniuc@...lteam.com, keith.busch@...el.com,
        Shyam_Iyer@...l.com, lukas@...ner.de, okaya@...nel.org,
        torvalds@...ux-foundation.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/LINK: bw_notification: Do not leave interrupt
 handler NULL

On Mon, Mar 18, 2019 at 08:12:04PM -0500, Alexandru Gagniuc wrote:
> I was able to test this on edge-triggered interrupts. None of my
> machines have PCIe ports that use level-triggered interrupts. This
> might not be too straightforward to test without a hardware yanker,
> but if there's a way to force a specific interrupt to be level
> triggered, I could do the testing on my end.

Spec says INTx emulation is required, so I think it ought to be possible
to force them to level-triggered if you disable MSI. The kernel parameter
'pci=nomsi' can force everything to INTx.