linux-kernel - Re: [PATCH] sysfs: add per pci device msi[x] irq listing (v5)

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Date:	Fri, 14 Oct 2011 09:21:48 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-pci@...r.kernel.org, Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH] sysfs: add per pci device msi[x] irq listing (v5)

On Thu, 6 Oct 2011 14:08:18 -0400
Neil Horman <nhorman@...driver.com> wrote:

> This patch adds a per-pci-device subdirectory in sysfs called:
> /sys/bus/pci/devices/<device>/msi_irqs
> 
> This sub-directory exports the set of msi vectors allocated by a given
> pci device, by creating a numbered sub-directory for each vector beneath
> msi_irqs.  For each vector various attributes can be exported.  Currently the
> only attribute is called mode, which tracks the operational mode of that vector
> (msi vs. msix)
> 

Ok this adds new ABI in the form of sysfs files so I want to make sure
it's ok.

Matthew has dreams of a more sophisticated MSI-X management scheme, but
it sounds to me like that will mostly affect the driver interfaces and
shouldn't be incompatible with the sysfs scheme you propose here.

If so, great, we can pull this in and maybe one day someone will
implement better MSI-X support.

If not, I'd like to hear objections now; Neil has been responsive and
fixed several issues.  I don't want to block his patch unless we have
something concrete that it conflicts with.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center

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