From: linmiaohe <linmiaohe@huawei.com>
To: Lukas Wunner <lukas@wunner.de>
Cc: "bhelgaas@google.com" <bhelgaas@google.com>,
"andy.shevchenko@gmail.com" <andy.shevchenko@gmail.com>,
"rafael.j.wysocki@intel.com" <rafael.j.wysocki@intel.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mingfangsen <mingfangsen@huawei.com>
Subject: Re: A question about shpcp.
Date: Tue, 2 Jul 2019 13:14:03 +0000 [thread overview]
Message-ID: <e5bdb5e7d3ad427a913a7e66e750a464@huawei.com> (raw)
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.
next reply other threads:[~2019-07-02 13:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 13:14 linmiaohe [this message]
[not found] <d87dfa281d0d4e7da3f6bf714a7c2e5a@huawei.com>
2019-07-02 12:21 ` Lukas Wunner
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