linux-kernel - Re: [PATCH v2] PCI/MSI: Avoid torn updates to MSI pairs

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Message-ID: <8736c2myel.fsf@nanos.tec.linutronix.de>
Date:   Sun, 26 Jan 2020 09:09:54 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Evan Green <evgreen@...omium.org>
Subject: Re: [PATCH v2] PCI/MSI: Avoid torn updates to MSI pairs

Jacob Pan <jacob.jun.pan@...ux.intel.com> writes:

> It seems we could avoid force_retrigger once IR is turned on. I have tried
> this patch with IR turned on, still seeing force_retrigger=1 for MSIs w/o
> masking.

Yes. That patch was a POC and surely not a final solution. Aside of that
I'm still looking into a solution to avoid that which does not involve
horrible locking and tons of scary code.

Thanks,

        tglx