On Thu, 23 Sep 2021, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
>
> Get host bridge node given a PCI device attached to it.
>
> This helper will be re-used for adding PCI devices by the subsequent
> patches.
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> xen/arch/arm/pci/pci-host-common.c | 17 +++++++++++++++++
> xen/include/asm-arm/pci.h | 1 +
> 2 files changed, 18 insertions(+)
>
> diff --git a/xen/arch/arm/pci/pci-host-common.c b/xen/arch/arm/pci/pci-host-common.c
> index a88f20175ea9..1567b6e2956c 100644
> --- a/xen/arch/arm/pci/pci-host-common.c
> +++ b/xen/arch/arm/pci/pci-host-common.c
> @@ -283,6 +283,23 @@ int pci_get_host_bridge_segment(const struct dt_device_node *node,
> return -EINVAL;
> }
>
> +/*
> + * Get host bridge node given a device attached to it.
> + */
> +struct dt_device_node *pci_find_host_bridge_node(struct device *dev)
> +{
> + struct pci_host_bridge *bridge;
> + struct pci_dev *pdev = dev_to_pci(dev);
> +
> + bridge = pci_find_host_bridge(pdev->seg, pdev->bus);
> + if ( unlikely(!bridge) )
> + {
> + printk(XENLOG_ERR "Unable to find PCI bridge for "PRI_pci"\n",
> + pdev->seg, pdev->bus, pdev->sbdf.dev, pdev->sbdf.fn);
> + return NULL;
> + }
> + return bridge->dt_node;
> +}
> /*
> * Local variables:
> * mode: C
> diff --git a/xen/include/asm-arm/pci.h b/xen/include/asm-arm/pci.h
> index 9e366ae67e83..5b100556225e 100644
> --- a/xen/include/asm-arm/pci.h
> +++ b/xen/include/asm-arm/pci.h
> @@ -103,6 +103,7 @@ void __iomem *pci_ecam_map_bus(struct pci_host_bridge *bridge,
> struct pci_host_bridge *pci_find_host_bridge(uint16_t segment, uint8_t bus);
> int pci_get_host_bridge_segment(const struct dt_device_node *node,
> uint16_t *segment);
> +struct dt_device_node *pci_find_host_bridge_node(struct device *dev);
>
> static always_inline bool is_pci_passthrough_enabled(void)
> {
> --
> 2.25.1
>