From: Greg <gvrose8192@gmail.com>
To: Mason <slash.tmp@free.fr>
Cc: linux-pci <linux-pci@vger.kernel.org>,
Bjorn Helgaas <helgaas@kernel.org>,
David Laight <david.laight@aculab.com>,
Robin Murphy <robin.murphy@arm.com>,
Thibaud Cornic <thibaud_cornic@sigmadesigns.com>,
Phuong Nguyen <phuong_nguyen@sigmadesigns.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
netdev <netdev@vger.kernel.org>,
Tim Harvey <tharvey@gateworks.com>, Arnd Bergmann <arnd@arndb.de>
Subject: Re: Legacy features in PCI Express devices
Date: Mon, 13 Mar 2017 04:08:03 -0700 [thread overview]
Message-ID: <1489403283.21692.1.camel@gmail.com> (raw)
In-Reply-To: <ef5c9778-fbae-9f4f-ac2e-29b8597537a5@free.fr>
On Mon, 2017-03-13 at 17:10 +0100, Mason wrote:
> Hello,
>
> There are two revisions of our PCI Express controller.
>
> Rev 1 did not support the following features:
>
> 1) legacy PCI interrupt delivery (INTx signals)
I'm not sure about this...
> 2) I/O address space
But yes, definitely some support this.
We're working on a new type of network controller that uses I/O for some
types of low latency feature support.
- Greg
>
> Internally, someone stated that such missing support would prevent
> some PCIe cards from working with our controller.
>
> Are there really modern PCIe cards that require 1) and/or 2)
> to function?
>
> Can someone provide examples of such cards, so that I may test them
> on both revisions?
>
> I was told to check ath9k-based cards. Any other examples?
>
> Looking around, I came across this thread:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-March/418254.html
> "i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity"
>
> IIUC, although some PCIe boards do support MSI, the driver might not
> put in the work to use that infrastructure, and instead reverts to
> legacy interrupts. (So it is a SW issue, in a sense.)
>
> Regards.
WARNING: multiple messages have this Message-ID (diff)
From: gvrose8192@gmail.com (Greg)
To: linux-arm-kernel@lists.infradead.org
Subject: Legacy features in PCI Express devices
Date: Mon, 13 Mar 2017 04:08:03 -0700 [thread overview]
Message-ID: <1489403283.21692.1.camel@gmail.com> (raw)
In-Reply-To: <ef5c9778-fbae-9f4f-ac2e-29b8597537a5@free.fr>
On Mon, 2017-03-13 at 17:10 +0100, Mason wrote:
> Hello,
>
> There are two revisions of our PCI Express controller.
>
> Rev 1 did not support the following features:
>
> 1) legacy PCI interrupt delivery (INTx signals)
I'm not sure about this...
> 2) I/O address space
But yes, definitely some support this.
We're working on a new type of network controller that uses I/O for some
types of low latency feature support.
- Greg
>
> Internally, someone stated that such missing support would prevent
> some PCIe cards from working with our controller.
>
> Are there really modern PCIe cards that require 1) and/or 2)
> to function?
>
> Can someone provide examples of such cards, so that I may test them
> on both revisions?
>
> I was told to check ath9k-based cards. Any other examples?
>
> Looking around, I came across this thread:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-March/418254.html
> "i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity"
>
> IIUC, although some PCIe boards do support MSI, the driver might not
> put in the work to use that infrastructure, and instead reverts to
> legacy interrupts. (So it is a SW issue, in a sense.)
>
> Regards.
next prev parent reply other threads:[~2017-03-13 11:08 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-13 16:10 Legacy features in PCI Express devices Mason
2017-03-13 16:10 ` Mason
2017-03-13 11:08 ` Greg [this message]
2017-03-13 11:08 ` Greg
2017-03-13 17:12 ` Robin Murphy
2017-03-13 17:12 ` Robin Murphy
2017-03-13 17:39 ` Mason
2017-03-13 17:39 ` Mason
2017-03-13 17:55 ` Robin Murphy
2017-03-13 17:55 ` Robin Murphy
2017-03-13 17:24 ` David Daney
2017-03-13 17:24 ` David Daney
2017-03-13 18:55 ` Bjorn Helgaas
2017-03-13 18:55 ` Bjorn Helgaas
2017-03-13 18:55 ` Bjorn Helgaas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1489403283.21692.1.camel@gmail.com \
--to=gvrose8192@gmail.com \
--cc=arnd@arndb.de \
--cc=david.laight@aculab.com \
--cc=helgaas@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-pci@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=phuong_nguyen@sigmadesigns.com \
--cc=robin.murphy@arm.com \
--cc=slash.tmp@free.fr \
--cc=tharvey@gateworks.com \
--cc=thibaud_cornic@sigmadesigns.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.