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

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Message-ID: <20111014164059.GA13951@suse.de>
Date:	Fri, 14 Oct 2011 10:40:59 -0600
From:	Greg KH <gregkh@...e.de>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Neil Horman <nhorman@...driver.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH] sysfs: add per pci device msi[x] irq listing (v5)

On Fri, Oct 14, 2011 at 09:21:48AM -0700, Jesse Barnes wrote:
> 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.

Again, no objection from me at all.

greg k-h
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