linux-kernel - Re: [PATCH V7 3/8] PCI/MSI: Setup MSI domain on a per-device basis using IORT ACPI table

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Date:	Tue, 19 Jul 2016 16:42:27 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Tomasz Nowicki <tn@...ihalf.com>
Cc:	marc.zyngier@....com, tglx@...utronix.de, jason@...edaemon.net,
	rjw@...ysocki.net, bhelgaas@...gle.com, lorenzo.pieralisi@....com,
	robert.richter@...iumnetworks.com, shijie.huang@....com,
	Suravee.Suthikulpanit@....com, hanjun.guo@...aro.org,
	al.stone@...aro.org, graeme.gregory@...aro.org,
	Catalin.Marinas@....com, will.deacon@....com,
	linux-kernel@...r.kernel.org, okaya@...eaurora.org,
	linux-acpi@...r.kernel.org, ddaney.cavm@...il.com,
	linux-pci@...r.kernel.org, mw@...ihalf.com,
	andrea.gallo@...aro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V7 3/8] PCI/MSI: Setup MSI domain on a per-device basis
 using IORT ACPI table

On Mon, Jun 20, 2016 at 01:02:16PM +0200, Tomasz Nowicki wrote:
> It is possible to provide information about which MSI controller to
> use on a per-device basis for DT. This patch supply this with ACPI support.
> 
> Currently, IORT is the only one ACPI table which can provide such mapping.
> In order to plug IORT into MSI infrastructure we are adding ACPI
> equivalents for finding PCI device domain and its RID translation
> (pci_msi_domain_get_msi_rid and pci_msi_domain_get_msi_rid calls).
> 
> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
> Acked-by: Marc Zyngier <marc.zyngier@....com>

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

I assume this will be merged along with the rest of the series via
some non-PCI tree.

> ---
>  drivers/pci/msi.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index a080f44..1d45e81 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -18,6 +18,7 @@
>  #include <linux/smp.h>
>  #include <linux/errno.h>
>  #include <linux/io.h>
> +#include <linux/iort.h>
>  #include <linux/slab.h>
>  #include <linux/irqdomain.h>
>  #include <linux/of_irq.h>
> @@ -1364,8 +1365,8 @@ u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
>  	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
>  
>  	of_node = irq_domain_get_of_node(domain);
> -	if (of_node)
> -		rid = of_msi_map_rid(&pdev->dev, of_node, rid);
> +	rid = of_node ? of_msi_map_rid(&pdev->dev, of_node, rid) :
> +			iort_msi_map_rid(&pdev->dev, rid);
>  
>  	return rid;
>  }
> @@ -1381,9 +1382,13 @@ u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
>   */
>  struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
>  {
> +	struct irq_domain *dom;
>  	u32 rid = 0;
>  
>  	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> -	return of_msi_map_get_device_domain(&pdev->dev, rid);
> +	dom = of_msi_map_get_device_domain(&pdev->dev, rid);
> +	if (!dom)
> +		dom = iort_get_device_domain(&pdev->dev, rid);
> +	return dom;
>  }
>  #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
> -- 
> 1.9.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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