On Thu, 23 Sep 2021, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
>
> Add new device type (DEV_PCI) to distinguish PCI devices from platform
> DT devices, so some drivers, like IOMMU, can handle PCI devices
> differently.
>
> Also add a helper which is when given a struct device returns the
> corresponding struct pci_dev which this device is a part of.
>
> Because of the header cross-dependencies, e.g. we need both
> struct pci_dev and struct arch_pci_dev at the same time, this cannot be
> done with an inline. Macro can be implemented, but looks scary:
>
> #define dev_to_pci_dev(dev) container_of((container_of((dev), \
> struct arch_pci_dev, dev), struct pci_dev, arch)
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> Since v1:
> - Folded new device type (DEV_PCI) into this patch.
> ---
> xen/arch/arm/pci/pci.c | 10 ++++++++++
> xen/include/asm-arm/device.h | 4 ++--
> xen/include/asm-arm/pci.h | 7 +++++++
> 3 files changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c
> index bb15edbccc90..e0420d0d86c1 100644
> --- a/xen/arch/arm/pci/pci.c
> +++ b/xen/arch/arm/pci/pci.c
> @@ -27,6 +27,16 @@ int arch_pci_clean_pirqs(struct domain *d)
> return 0;
> }
>
> +struct pci_dev *dev_to_pci(struct device *dev)
> +{
> + struct arch_pci_dev *arch_dev;
> +
> + ASSERT(dev->type == DEV_PCI);
> +
> + arch_dev = container_of((dev), struct arch_pci_dev, dev);
> + return container_of(arch_dev, struct pci_dev, arch);
> +}
> +
> static int __init dt_pci_init(void)
> {
> struct dt_device_node *np;
> diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
> index 64aaa2641b7f..12de217b36b9 100644
> --- a/xen/include/asm-arm/device.h
> +++ b/xen/include/asm-arm/device.h
> @@ -4,6 +4,7 @@
> enum device_type
> {
> DEV_DT,
> + DEV_PCI,
> };
>
> struct dev_archdata {
> @@ -27,8 +28,7 @@ typedef struct device device_t;
>
> #include <xen/device_tree.h>
>
> -/* TODO: Correctly implement dev_is_pci when PCI is supported on ARM */
> -#define dev_is_pci(dev) ((void)(dev), 0)
> +#define dev_is_pci(dev) ((dev)->type == DEV_PCI)
> #define dev_is_dt(dev) ((dev)->type == DEV_DT)
>
> enum device_class
> diff --git a/xen/include/asm-arm/pci.h b/xen/include/asm-arm/pci.h
> index d2728a098a11..9e366ae67e83 100644
> --- a/xen/include/asm-arm/pci.h
> +++ b/xen/include/asm-arm/pci.h
> @@ -27,6 +27,13 @@ struct arch_pci_dev {
> struct device dev;
> };
>
> +/*
> + * Because of the header cross-dependencies, e.g. we need both
> + * struct pci_dev and struct arch_pci_dev at the same time, this cannot be
> + * done with an inline here. Macro can be implemented, but looks scary.
> + */
> +struct pci_dev *dev_to_pci(struct device *dev);
> +
> /* Arch-specific MSI data for vPCI. */
> struct vpci_arch_msi {
> };
> --
> 2.25.1
>