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From: Bjorn Helgaas <bhelgaas@google.com>
To: Bharat Bhushan <r65777@freescale.com>
Cc: linux-pci@vger.kernel.org, joro@8bytes.org,
	stuart.yoder@freescale.com, iommu@lists.linux-foundation.org,
	agraf@suse.de, Bharat Bhushan <Bharat.Bhushan@freescale.com>,
	alex.williamson@redhat.com, scottwood@freescale.com,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/9 v2] pci:msi: add weak function for returning msi region info
Date: Mon, 25 Nov 2013 16:36:02 -0700	[thread overview]
Message-ID: <20131125233602.GA4066@google.com> (raw)
In-Reply-To: <1384838233-24847-2-git-send-email-Bharat.Bhushan@freescale.com>

On Tue, Nov 19, 2013 at 10:47:05AM +0530, Bharat Bhushan wrote:
> In Aperture type of IOMMU (like FSL PAMU), VFIO-iommu system need to know
> the MSI region to map its window in h/w. This patch just defines the
> required weak functions only and will be used by followup patches.
> 
> Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
> ---
> v1->v2
>  - Added description on "struct msi_region" 
> 
>  drivers/pci/msi.c   |   22 ++++++++++++++++++++++
>  include/linux/msi.h |   14 ++++++++++++++
>  2 files changed, 36 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index d5f90d6..2643a29 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -67,6 +67,28 @@ int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
>  	return chip->check_device(chip, dev, nvec, type);
>  }
>  
> +int __weak arch_msi_get_region_count(void)
> +{
> +	return 0;
> +}
> +
> +int __weak arch_msi_get_region(int region_num, struct msi_region *region)
> +{
> +	return 0;
> +}
> +
> +int msi_get_region_count(void)
> +{
> +	return arch_msi_get_region_count();
> +}
> +EXPORT_SYMBOL(msi_get_region_count);
> +
> +int msi_get_region(int region_num, struct msi_region *region)
> +{
> +	return arch_msi_get_region(region_num, region);
> +}
> +EXPORT_SYMBOL(msi_get_region);
> +
>  int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>  {
>  	struct msi_desc *entry;
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index b17ead8..ade1480 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -51,6 +51,18 @@ struct msi_desc {
>  };
>  
>  /*
> + * This structure is used to get
> + * - physical address
> + * - size
> + * of a msi region
> + */
> +struct msi_region {
> +	int region_num; /* MSI region number */
> +	dma_addr_t addr; /* Address of MSI region */
> +	size_t size; /* Size of MSI region */
> +};
> +
> +/*
>   * The arch hooks to setup up msi irqs. Those functions are
>   * implemented as weak symbols so that they /can/ be overriden by
>   * architecture specific code if needed.
> @@ -64,6 +76,8 @@ void arch_restore_msi_irqs(struct pci_dev *dev, int irq);
>  
>  void default_teardown_msi_irqs(struct pci_dev *dev);
>  void default_restore_msi_irqs(struct pci_dev *dev, int irq);
> +int arch_msi_get_region_count(void);
> +int arch_msi_get_region(int region_num, struct msi_region *region);

It doesn't look like any of this (struct msi_region, msi_get_region(),
msi_get_region_count()) is actually used by drivers/pci/msi.c, so I don't
think it needs to be declared in generic code.  It looks like it's only
used in drivers/vfio/vfio_iommu_fsl_pamu.c, where you already know you have
an FSL IOMMU, and you can just call FSL-specific interfaces directly.

Bjorn

>  
>  struct msi_chip {
>  	struct module *owner;
> -- 
> 1.7.0.4
> 
> 

  reply	other threads:[~2013-11-25 23:36 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-19  5:17 [PATCH 0/9 v2] vfio-pci: add support for Freescale IOMMU (PAMU) Bharat Bhushan
2013-11-19  5:17 ` [PATCH 1/9 v2] pci:msi: add weak function for returning msi region info Bharat Bhushan
2013-11-25 23:36   ` Bjorn Helgaas [this message]
2013-11-28 10:08     ` Bharat Bhushan
2013-11-19  5:17 ` [PATCH 2/9 v2] pci: msi: expose msi region information functions Bharat Bhushan
2013-11-19  5:17 ` [PATCH 3/9 v2] powerpc: pci: Add arch specific msi region interface Bharat Bhushan
2013-11-19  5:17 ` [PATCH 4/9 v2] powerpc: msi: Extend the msi region interface to get info from fsl_msi Bharat Bhushan
2013-11-19  5:17 ` [PATCH 5/9 v2] pci/msi: interface to set an iova for a msi region Bharat Bhushan
2013-11-19  5:17 ` [PATCH 6/9 v2] powerpc: pci: Extend msi iova page setup to arch specific Bharat Bhushan
2013-11-19  5:17 ` [PATCH 7/9 v2] pci: msi: Extend msi iova setting interface to powerpc arch Bharat Bhushan
2013-11-19  5:17 ` [PATCH 8/9 v2] vfio: moving some functions in common file Bharat Bhushan
2013-11-19  5:17 ` [PATCH 9/9 v2] vfio pci: Add vfio iommu implementation for FSL_PAMU Bharat Bhushan
2013-11-20 18:47 ` [PATCH 0/9 v2] vfio-pci: add support for Freescale IOMMU (PAMU) Alex Williamson
2013-11-21 11:20   ` Varun Sethi
2013-11-21 11:20   ` Bharat Bhushan
2013-11-21 20:43     ` Alex Williamson
2013-11-21 20:47       ` Scott Wood
2013-11-21 21:00         ` Alex Williamson
2013-11-25  5:33           ` Bharat Bhushan
2013-11-25 16:38             ` Alex Williamson
2013-11-27 16:08               ` Bharat Bhushan
2013-11-28  9:19               ` Bharat Bhushan
2013-12-06  0:21                 ` Scott Wood
2013-12-06  4:11                   ` Bharat Bhushan
2013-12-06 18:59                     ` Scott Wood
2013-12-06 19:30                       ` Alex Williamson
2013-12-07  0:22                         ` Scott Wood
2013-12-10  5:37                         ` Bharat.Bhushan
2013-12-10  5:53                           ` Alex Williamson
2013-12-10  9:09                             ` Bharat.Bhushan
2013-12-06  0:00             ` Scott Wood
2013-12-06  4:17               ` Bharat Bhushan
2013-12-06 19:25                 ` Scott Wood
2013-12-10  5:37                   ` Bharat.Bhushan
2013-12-10 20:29                     ` Scott Wood

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