linux-kernel - Re: [PATCH v5 3/4] PCI/MSI: Add helper function pci_msi_domain_get_msi

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Message-ID: <20151015200836.GB10442@localhost>
Date:	Thu, 15 Oct 2015 15:08:36 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Marc Zyngier <marc.zyngier@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Frank Rowand <frowand.list@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v5 3/4] PCI/MSI:  Add helper function
 pci_msi_domain_get_msi_rid().

On Thu, Oct 08, 2015 at 03:10:49PM -0700, David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> Add pci_msi_domain_get_msi_rid() to return the MSI requester id (RID).
> Initially needed by gic-v3 based systems. It will be used by follow on
> patch to drivers/irqchip/irq-gic-v3-its-pci-msi.c
> 
> Initially supports mapping the RID via OF device tree.  In the future,
> this could be extended to use ACPI _IORT tables as well.
> 
> Reviewed-by: Marc Zyngier <marc.zyngier@....com>
> Signed-off-by: David Daney <david.daney@...ium.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

I assume Thomas will take these (or at least, somebody other than me).

> ---
>  drivers/pci/msi.c   | 30 ++++++++++++++++++++++++++++++
>  include/linux/msi.h |  1 +
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index d449714..81a2798 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -20,6 +20,7 @@
>  #include <linux/io.h>
>  #include <linux/slab.h>
>  #include <linux/irqdomain.h>
> +#include <linux/of_irq.h>
>  
>  #include "pci.h"
>  
> @@ -1327,4 +1328,33 @@ struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
>  
>  	return domain;
>  }
> +
> +static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
> +{
> +	u32 *pa = data;
> +
> +	*pa = alias;
> +	return 0;
> +}
> +/**
> + * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
> + * @domain:	The interrupt domain
> + * @pdev:	The PCI device.
> + *
> + * The RID for a device is formed from the alias, with a firmware
> + * supplied mapping applied
> + *
> + * Returns: The RID.
> + */
> +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
> +{
> +	u32 rid = 0;
> +
> +	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> +
> +	if (domain->of_node)
> +		rid = of_msi_map_rid(&pdev->dev, domain->of_node, rid);
> +
> +	return rid;
> +}
>  #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index ad939d0..56e3b76 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -293,6 +293,7 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
>  					  struct msi_desc *desc);
>  int pci_msi_domain_check_cap(struct irq_domain *domain,
>  			     struct msi_domain_info *info, struct device *dev);
> +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
>  #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
>  
>  #endif /* LINUX_MSI_H */
> -- 
> 1.9.1
> 
> --
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