From: Keith Busch <keith.busch@intel.com>
To: Wei Zhang <wzhang@fb.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
Wesley Yung <wesley.yung@microsemi.com>,
Sammy Hui <sammy.hui@intel.com>,
Joseph Gruher <joseph.r.gruher@intel.com>,
Krishna Dhulipala <krishnad@fb.com>
Subject: Re: [PATCH 1/2] pcie/dpc: Skip DPC event if device is not present
Date: Wed, 10 May 2017 09:17:29 -0400 [thread overview]
Message-ID: <20170510131729.GD2572@localhost.localdomain> (raw)
In-Reply-To: <862590BB-8E84-4F2D-B5F9-A665000AA9CB@fb.com>
On Wed, May 10, 2017 at 03:39:27AM +0000, Wei Zhang wrote:
> Hi Keith and Wes,
>
> I wonder if getting an All 1’s read on the DPC status register is a
> valid scenario. The DPC register is on the switch, why would the
> status register returns All 1’s even if the device is removed?
Ah, this isn't about the downstream device precense. This is about
the DPC switch device itself, like if you pull the cable out of the
enclosure. Reading anything off the DSPs in it will see all 1's.
next prev parent reply other threads:[~2017-05-10 13:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-28 16:02 [PATCH 0/2] pcie/dpc: Fixes Keith Busch
2017-04-28 16:02 ` [PATCH 1/2] pcie/dpc: Skip DPC event if device is not present Keith Busch
2017-05-10 3:39 ` Wei Zhang
2017-05-10 13:17 ` Keith Busch [this message]
2017-05-10 14:16 ` Wesley Yung
2017-05-10 16:35 ` Wei Zhang
2017-05-10 16:44 ` Keith Busch
2017-05-10 16:43 ` Wesley Yung
2017-05-10 16:52 ` Wesley Yung
2017-05-10 17:42 ` Keith Busch
2017-04-28 16:02 ` [PATCH 2/2] pcie/dpc: Fix control register setting Keith Busch
2017-05-22 23:43 ` [PATCH 0/2] pcie/dpc: Fixes Bjorn Helgaas
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