linux-kernel - Re: A question about shpcp.

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Message-ID: <e5bdb5e7d3ad427a913a7e66e750a464@huawei.com>
Date:   Tue, 2 Jul 2019 13:14:03 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Lukas Wunner <lukas@...ner.de>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mingfangsen <mingfangsen@...wei.com>
Subject: Re: A question about shpcp.

On Thu, July 2, 2019 at 20:21:18PM +0000,  Lukas wrote:
> On Thu, Jun 27, 2019 at 12:16:18PM +0000, linmiaohe wrote:
> > It's very nice of you if you could tell me why is 5*HZ there and if 
> > this delay can be reduced?
>
> According to Table 2-4 of the PCI Standard Hot-Plug Controller and Subsystem Specification, "System software is waiting 5 seconds to provide the user with an opportunity to cancel the hot-plug operation."
> (http://drydkim.com/MyDocuments/PCI%20Spec/specifications/shpc1_0.pdf)
>
> So the reason the delay can't be reduced or removed is because the spec mandates it.
>
> Thanks,
>
> Lukas

Many thanks for explaining this. Thanks a lot.
Have a nice day.
Best wishes.