On 2014/12/9 4:12, Marc Zyngier wrote:
> In order to be able to populate the device msi_domain field,
> add the necesary hooks to propagate the PHB msi_domain across
> secondary busses to devices.
>
> So far, nobody populates the initial msi_domain.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> drivers/pci/probe.c | 24 ++++++++++++++++++++++++
> include/linux/pci.h | 1 +
> 2 files changed, 25 insertions(+)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index c8ca98c..d1009a2 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -670,6 +670,20 @@ static void pci_set_bus_speed(struct pci_bus *bus)
> }
> }
>
> +void __weak pcibios_set_phb_msi_domain(struct pci_bus *bus)
> +{
> +}
> +
> +static void pci_set_bus_msi_domain(struct pci_bus *bus)
> +{
> + struct pci_dev *bridge = bus->self;
> +
> + if (!bridge)
> + pcibios_set_phb_msi_domain(bus);
> + else
> + dev_set_msi_domain(&bus->dev, dev_get_msi_domain(&bridge->dev));
> +}
Hi Marc, we can not assume pci devices under same phb share the same msi irq domain,
now in x86, pci devices under the same phb may associate different msi irq domain.
> +
> static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
> struct pci_dev *bridge, int busnr)
> {
> @@ -723,6 +737,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
> bridge->subordinate = child;
>
> add_dev:
> + pci_set_bus_msi_domain(child);
> ret = device_register(&child->dev);
> WARN_ON(ret < 0);
>
> @@ -1517,6 +1532,11 @@ static void pci_init_capabilities(struct pci_dev *dev)
> pci_enable_acs(dev);
> }
>
> +static void pci_set_msi_domain(struct pci_dev *dev)
> +{
> + dev_set_msi_domain(&dev->dev, dev_get_msi_domain(&dev->bus->dev));
> +}
> +
> void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
> {
> int ret;
> @@ -1546,6 +1566,9 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
> /* Initialize various capabilities */
> pci_init_capabilities(dev);
>
> + /* Setup MSI irq domain */
> + pci_set_msi_domain(dev);
> +
> /*
> * Add the device to our list of discovered devices
> * and the bus list for fixup functions, etc.
> @@ -1947,6 +1970,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> b->bridge = get_device(&bridge->dev);
> device_enable_async_suspend(b->bridge);
> pci_set_bus_of_node(b);
> + pci_set_bus_msi_domain(b);
>
> if (!parent)
> set_dev_node(b->bridge, pcibus_to_node(b));
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index a523cee..3266764 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1637,6 +1637,7 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev,
> int pcibios_add_device(struct pci_dev *dev);
> void pcibios_release_device(struct pci_dev *dev);
> void pcibios_penalize_isa_irq(int irq, int active);
> +void pcibios_set_phb_msi_domain(struct pci_bus *bus);
>
> #ifdef CONFIG_HIBERNATE_CALLBACKS
> extern struct dev_pm_ops pcibios_pm_ops;
>
--
Thanks!
Yijing
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