[3/6] PCI/MSI: of: add support for OF-provided msi_domain

In order to populate the PHB msi_domain, use the "msi-parent"
attribute to lookup a corresponding irq domain. If found,
this is our MSI domain.

This gets plugged into the core PCI code.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 drivers/pci/of.c    | 15 +++++++++++++++
 drivers/pci/probe.c |  1 +
 include/linux/pci.h |  2 ++
 3 files changed, 18 insertions(+)

On Mon, Dec 08, 2014 at 08:12:20PM +0000, Marc Zyngier wrote:
> In order to populate the PHB msi_domain, use the "msi-parent"
> attribute to lookup a corresponding irq domain. If found,
> this is our MSI domain.
> 
> This gets plugged into the core PCI code.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  drivers/pci/of.c    | 15 +++++++++++++++
>  drivers/pci/probe.c |  1 +
>  include/linux/pci.h |  2 ++
>  3 files changed, 18 insertions(+)
> 
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index f092993..d8d1274 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -9,6 +9,7 @@
>   * 2 of the License, or (at your option) any later version.
>   */
>  
> +#include <linux/irqdomain.h>
>  #include <linux/kernel.h>
>  #include <linux/pci.h>
>  #include <linux/of.h>
> @@ -59,3 +60,17 @@ struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
>  		return of_node_get(bus->bridge->parent->of_node);
>  	return NULL;
>  }
> +
> +void pci_set_phb_of_msi_domain(struct pci_bus *bus)

Same "phb" comment as before (also in the changelog above).

> +{
> +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
> +	struct device_node *np;
> +
> +	if (!bus->dev.of_node)
> +		return;
> +	np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
> +	if (!np)
> +		return;
> +	dev_set_msi_domain(&bus->dev, irq_find_host(np));
> +#endif
> +}
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index d1009a2..65600e5 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -672,6 +672,7 @@ static void pci_set_bus_speed(struct pci_bus *bus)
>  
>  void __weak pcibios_set_phb_msi_domain(struct pci_bus *bus)
>  {
> +	pci_set_phb_of_msi_domain(bus);
>  }
>  
>  static void pci_set_bus_msi_domain(struct pci_bus *bus)
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 3266764..6a9713f 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1825,6 +1825,7 @@ void pci_set_of_node(struct pci_dev *dev);
>  void pci_release_of_node(struct pci_dev *dev);
>  void pci_set_bus_of_node(struct pci_bus *bus);
>  void pci_release_bus_of_node(struct pci_bus *bus);
> +void pci_set_phb_of_msi_domain(struct pci_bus *bus);
>  
>  /* Arch may override this (weak) */
>  struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
> @@ -1845,6 +1846,7 @@ static inline void pci_set_of_node(struct pci_dev *dev) { }
>  static inline void pci_release_of_node(struct pci_dev *dev) { }
>  static inline void pci_set_bus_of_node(struct pci_bus *bus) { }
>  static inline void pci_release_bus_of_node(struct pci_bus *bus) { }
> +static inline void pci_set_phb_of_msi_domain(struct pci_bus *bus) {}

Add a space between the braces to match the others.

>  #endif  /* CONFIG_OF */
>  
>  #ifdef CONFIG_EEH
> -- 
> 2.1.3
> 
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