Re: [PATCH 08/12] of/irq: make of_msi_map_get_device_domain() bus agnostic

From: Bjorn Helgaas <helgaas@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: devicetree@vger.kernel.org, Sudeep Holla <sudeep.holla@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Marc Zyngier <maz@kernel.org>, Hanjun Guo <guohanjun@huawei.com>,
	linux-pci@vger.kernel.org,
	Makarand Pawagi <makarand.pawagi@nxp.com>,
	linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	Diana Craciun <diana.craciun@oss.nxp.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Robin Murphy <robin.murphy@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 08/12] of/irq: make of_msi_map_get_device_domain() bus agnostic
Date: Thu, 21 May 2020 14:57:15 -0500	[thread overview]
Message-ID: <20200521195715.GA1171267@bjorn-Precision-5520> (raw)
In-Reply-To: <20200521130008.8266-9-lorenzo.pieralisi@arm.com>

On Thu, May 21, 2020 at 02:00:04PM +0100, Lorenzo Pieralisi wrote:
> From: Diana Craciun <diana.craciun@oss.nxp.com>
> 
> of_msi_map_get_device_domain() is PCI specific but it need not be and
> can be easily changed to be bus agnostic in order to be used by other
> busses by adding an IRQ domain bus token as an input parameter.
> 
> Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Marc Zyngier <maz@kernel.org>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>	# pci/msi.c

> ---
>  drivers/of/irq.c       | 8 +++++---
>  drivers/pci/msi.c      | 2 +-
>  include/linux/of_irq.h | 5 +++--
>  3 files changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index a296eaf52a5b..48a40326984f 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -613,18 +613,20 @@ u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
>   * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain
>   * @dev: device for which the mapping is to be done.
>   * @rid: Requester ID for the device.
> + * @bus_token: Bus token
>   *
>   * Walk up the device hierarchy looking for devices with a "msi-map"
>   * property.
>   *
>   * Returns: the MSI domain for this device (or NULL on failure)
>   */
> -struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 rid)
> +struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 id,
> +						u32 bus_token)
>  {
>  	struct device_node *np = NULL;
>  
> -	__of_msi_map_rid(dev, &np, rid);
> -	return irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
> +	__of_msi_map_rid(dev, &np, id);
> +	return irq_find_matching_host(np, bus_token);
>  }
>  
>  /**
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index 74a91f52ecc0..9532e1d12d3f 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -1556,7 +1556,7 @@ struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
>  	u32 rid = pci_dev_id(pdev);
>  
>  	pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> -	dom = of_msi_map_get_device_domain(&pdev->dev, rid);
> +	dom = of_msi_map_get_device_domain(&pdev->dev, rid, DOMAIN_BUS_PCI_MSI);
>  	if (!dom)
>  		dom = iort_get_device_domain(&pdev->dev, rid,
>  					     DOMAIN_BUS_PCI_MSI);
> diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
> index 1214cabb2247..7142a3722758 100644
> --- a/include/linux/of_irq.h
> +++ b/include/linux/of_irq.h
> @@ -52,7 +52,8 @@ extern struct irq_domain *of_msi_get_domain(struct device *dev,
>  					    struct device_node *np,
>  					    enum irq_domain_bus_token token);
>  extern struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
> -						       u32 rid);
> +							u32 id,
> +							u32 bus_token);
>  extern void of_msi_configure(struct device *dev, struct device_node *np);
>  u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in);
>  #else
> @@ -85,7 +86,7 @@ static inline struct irq_domain *of_msi_get_domain(struct device *dev,
>  	return NULL;
>  }
>  static inline struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
> -							      u32 rid)
> +						u32 id, u32 bus_token)
>  {
>  	return NULL;
>  }
> -- 
> 2.26.1
> 
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