linux-kernel - Re: [PATCH 1/2] PCI/MSI: Introduce pci_msix_table

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Date:	Wed, 21 Jan 2009 16:52:38 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	michael@...erman.id.au
Cc:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH 1/2] PCI/MSI: Introduce pci_msix_table_size()

On Wednesday 21 January 2009, Michael Ellerman wrote:
> On Wed, 2009-01-21 at 01:18 +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > Introduce new function pci_msix_table_size() returning the size of
> > the MSI-X table of given PCI device or 0 if the device doesn't
> > support MSI-X.
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > ---
> >  drivers/pci/msi.c   |   24 +++++++++++++++++++-----
> >  include/linux/pci.h |    5 +++++
> >  2 files changed, 24 insertions(+), 5 deletions(-)
> > 
> > Index: linux-2.6/drivers/pci/msi.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/pci/msi.c
> > +++ linux-2.6/drivers/pci/msi.c
> > @@ -670,6 +670,23 @@ static int msi_free_irqs(struct pci_dev*
> >  }
> >  
> >  /**
> > + * pci_msix_table_size - return the number of device's MSI-X table entries
> > + * @dev: pointer to the pci_dev data structure of MSI-X device function
> > + */
> > +int pci_msix_table_size(struct pci_dev *dev)
> > +{
> > +	int pos;
> > +	u16 control;
> > +
> > +	pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> > +	if (!pos)
> > +		return 0;
> > +
> > +	pci_read_config_word(dev, msi_control_reg(pos), &control);
> > +	return multi_msix_capable(control);
> > +}
> > +
> > +/**
> >   * pci_enable_msix - configure device's MSI-X capability structure
> >   * @dev: pointer to the pci_dev data structure of MSI-X device function
> >   * @entries: pointer to an array of MSI-X entries
> > @@ -686,9 +703,8 @@ static int msi_free_irqs(struct pci_dev*
> >   **/
> >  int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
> >  {
> > -	int status, pos, nr_entries;
> > +	int status, nr_entries;
> >  	int i, j;
> > -	u16 control;
> >  
> >  	if (!entries)
> >   		return -EINVAL;
> > @@ -697,9 +713,7 @@ int pci_enable_msix(struct pci_dev* dev,
> >  	if (status)
> >  		return status;
> >  
> > -	pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> > -	pci_read_config_word(dev, msi_control_reg(pos), &control);
> > -	nr_entries = multi_msix_capable(control);
> > +	nr_entries = pci_msix_table_size(dev);
> >  	if (nvec > nr_entries)
> >  		return -EINVAL;
> 
> I see similar code in msix_capability_init(), although it still needs
> pos. Did you deliberately not replace that, or just miss it?

I didn't replace it exactly because it required the pos anyway.

Thanks,
Rafael
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