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Date:   Sun, 11 Apr 2021 20:25:55 -0600
From:   Keith Busch <kbusch@kernel.org>
To:     Lukas Wunner <lukas@wunner.de>
Cc:     Pali =?iso-8859-1?Q?Roh=E1r?= <pali@kernel.org>,
        linux-pci@vger.kernel.org
Subject: Re: PCI service interrupt handlers & access to PCI config space
Message-ID: <20210412022555.GA41644@C02WT3WMHTD6>
References: <20210410122845.nhenihbygmcjlegn@pali>
 <20210410142524.GA31187@wunner.de>
 <20210410151709.yb42uloq3aiwcoog@pali>
 <20210410162622.GA23381@wunner.de>
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On Sat, Apr 10, 2021 at 06:26:22PM +0200, Lukas Wunner wrote:
> 
> 1.5 sec is definitely too long.  This sounds like a quirk of this
> specific hardware.  Try to find out if the hardware can be configured
> differently to respond quicker.

While 1.5 sec is long, pcie spec's device control 2 register has an option to
be even longer: up to 64 seconds for a config access timeout! I'm not sure of
the reasoning to allow something that high, but I think the operating system
would be not be too happy with that.