On Thu, 19 Aug 2021, Rahul Singh wrote:
> pci_init(..) will be called during xen startup to initialize and probe
> the PCI host-bridge driver.
>
> Signed-off-by: Rahul Singh <[email protected]>
> ---
> xen/arch/arm/pci/pci.c | 54 ++++++++++++++++++++++++++++++++++++
> xen/include/asm-arm/device.h | 1 +
> 2 files changed, 55 insertions(+)
>
> diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c
> index dc55d23778..d1c9cf997d 100644
> --- a/xen/arch/arm/pci/pci.c
> +++ b/xen/arch/arm/pci/pci.c
> @@ -14,13 +14,67 @@
> * along with this program. If not, see <http://www.gnu.org/licenses/>.
> */
>
> +#include <xen/acpi.h>
> +#include <xen/device_tree.h>
> +#include <xen/errno.h>
> +#include <xen/init.h>
> #include <xen/pci.h>
> +#include <xen/param.h>
>
> int arch_pci_clean_pirqs(struct domain *d)
> {
> return 0;
> }
>
> +static int __init dt_pci_init(void)
> +{
> + struct dt_device_node *np;
> + int rc;
> +
> + dt_for_each_device_node(dt_host, np)
> + {
> + rc = device_init(np, DEVICE_PCI, NULL);
> + if( !rc )
> + continue;
> + /*
> + * Ignore the following error codes:
> + * - EBADF: Indicate the current is not an pci
^ a
> + * - ENODEV: The pci device is not present or cannot be used by
> + * Xen.
> + */
> + else if ( rc != -EBADF && rc != -ENODEV )
> + {
> + printk(XENLOG_ERR "No driver found in XEN or driver init
> error.\n");
> + return rc;
> + }
> + }
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_ACPI
> +static void __init acpi_pci_init(void)
If the DT init function returns int, then it would make sense for the
ACPI init function to return int as well?
> +{
> + printk(XENLOG_ERR "ACPI pci init not supported \n");
> + return;
> +}
> +#else
> +static inline void __init acpi_pci_init(void) { }
> +#endif
> +
> +static int __init pci_init(void)
> +{
> + if ( acpi_disabled )
> + dt_pci_init();
> + else
> + acpi_pci_init();
> +
> + pci_segments_init();
> +
> + return 0;
> +}
> +__initcall(pci_init);
> +
> /*
> * Local variables:
> * mode: C
> diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
> index ee7cff2d44..5ecd5e7bd1 100644
> --- a/xen/include/asm-arm/device.h
> +++ b/xen/include/asm-arm/device.h
> @@ -34,6 +34,7 @@ enum device_class
> DEVICE_SERIAL,
> DEVICE_IOMMU,
> DEVICE_GIC,
> + DEVICE_PCI,
> /* Use for error */
> DEVICE_UNKNOWN,
> };
> --
> 2.17.1
>
