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 17:07 UTC|newest]
Thread overview: 16+ 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 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
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