On Fri, Oct 30, 2015 at 11:11 PM, <jakeo@xxxxxxxxxxxxx> wrote:
> From: Jake Oshins <jakeo@xxxxxxxxxxxxx>
>
> This patch adds a second way of finding an IRQ domain associated with
> a root PCI bus. After looking to see if one can be found through
> the OF tree, it attempts to look up the IRQ domain through an
> fwnode_handle stored in the pci_sysdata struct.
>
> Signed-off-by: Jake Oshins <jakeo@xxxxxxxxxxxxx>
> ---
> arch/x86/include/asm/pci.h | 4 +++-
> drivers/pci/probe.c | 11 +++++++++++
> include/asm-generic/pci.h | 4 ++++
> 3 files changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 10213a1..fb74453 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -45,11 +45,13 @@ static inline int pci_proc_domain(struct pci_bus *bus)
> #endif
>
> #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> -static inline void *pci_fwnode(struct pci_bus *bus)
> +static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
I'm sorry what is the point to rename?
> {
> struct pci_sysdata *sd = bus->sysdata;
> return sd->fwnode;
> }
> +
> +#define pci_root_bus_fwnode _pci_root_bus_fwnode
> #endif
>
> /* Can be used to override the logic in pci_scan_bus for skipping
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index f441d1b..60e50a8 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -671,6 +671,17 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
> */
> d = pci_host_bridge_of_msi_domain(bus);
>
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> + /*
> + * If no IRQ domain was found via the OF tree, try looking it up
> + * directly through the fwnode_handle.
> + */
> + if (!d && pci_root_bus_fwnode(bus)) {
> + d = irq_find_matching_fwnode(pci_root_bus_fwnode(bus),
> + DOMAIN_BUS_PCI_MSI);
Gave a second glance and now noticed that you call
pci_root_bus_fwnode() twice. So, it actually might be more readable
like your first but modified variant:
if (!d) {
void *fwnode = pci_fwnode(bus);
if (fwnode)
d = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
}
> + }
> +#endif
> +
> return d;
> }
With Best Regards,
Andy Shevchenko
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