Re: [PATCH v2 11/16] ppc/pnv: add pnv-phb-root-port device

[Cédric Le Goater]

On 5/31/22 23:49, Daniel Henrique Barboza wrote:
> We have two very similar root-port devices, pnv-phb3-root-port and
> pnv-phb4-root-port. Both consist of a wrapper around the PCIESlot device
> that, until now, has no additional attributes.
>
> The main difference between the PHB3 and PHB4 root ports is that
> pnv-phb4-root-port has the pnv_phb4_root_port_reset() callback. All
> other differences can be merged in a single device without too much
> trouble.
>
> This patch introduces the unified pnv-phb-root-port that, in time, will
> be used as the default root port for the pnv-phb device.
>
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
> ---
>   hw/pci-host/pnv_phb.c | 107 ++++++++++++++++++++++++++++++++++++++----
>   hw/pci-host/pnv_phb.h |  17 +++++++
>   2 files changed, 116 insertions(+), 8 deletions(-)
>
> diff --git a/hw/pci-host/pnv_phb.c b/hw/pci-host/pnv_phb.c
> index 321c4e768a..5047e90d3a 100644
> --- a/hw/pci-host/pnv_phb.c
> +++ b/hw/pci-host/pnv_phb.c
> @@ -114,15 +114,106 @@ static void pnv_phb_class_init(ObjectClass *klass, void 
> *data)
>       dc->user_creatable = true;
>   }
>   
> -static void pnv_phb_register_type(void)
> +static void pnv_phb_root_port_reset(DeviceState *dev)
>   {
> -    static const TypeInfo pnv_phb_type_info = {
> -        .name          = TYPE_PNV_PHB,
> -        .parent        = TYPE_PCIE_HOST_BRIDGE,
> -        .instance_size = sizeof(PnvPHB),
> -        .class_init    = pnv_phb_class_init,
> -    };
> +    PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev);
> +    PnvPHBRootPort *rootport = PNV_PHB_ROOT_PORT(dev);
> +    PCIDevice *d = PCI_DEVICE(dev);
> +    uint8_t *conf = d->config;
>   
> +    rpc->parent_reset(dev);
> +
> +    if (rootport->version == 3) {
> +        return;
> +    }
> +
> +    /* PHB4 and later requires these extra reset steps */
> +    pci_byte_test_and_set_mask(conf + PCI_IO_BASE,
> +                               PCI_IO_RANGE_MASK & 0xff);
> +    pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,
> +                                 PCI_IO_RANGE_MASK & 0xff);
> +    pci_set_word(conf + PCI_MEMORY_BASE, 0);
> +    pci_set_word(conf + PCI_MEMORY_LIMIT, 0xfff0);
> +    pci_set_word(conf + PCI_PREF_MEMORY_BASE, 0x1);
> +    pci_set_word(conf + PCI_PREF_MEMORY_LIMIT, 0xfff1);
> +    pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0x1); /* Hack */
> +    pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0xffffffff);
> +    pci_config_set_interrupt_pin(conf, 0);
> +}
> +
> +static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp)
> +{
> +    PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev);
> +    PCIDevice *pci = PCI_DEVICE(dev);
> +    PCIBus *bus = pci_get_bus(pci);
> +    PnvPHB *phb = NULL;
> +    Error *local_err = NULL;
> +
> +    phb = (PnvPHB *) object_dynamic_cast(OBJECT(bus->qbus.parent),
> +                                          TYPE_PNV_PHB);
> +
> +    if (!phb) {
> +        error_setg(errp,
> +"pnv_phb_root_port devices must be connected to pnv-phb buses");
> +        return;
> +    }
> +
> +    /* Set unique chassis/slot values for the root port */
> +    qdev_prop_set_uint8(&pci->qdev, "chassis", phb->chip_id);
> +    qdev_prop_set_uint16(&pci->qdev, "slot", phb->phb_id);
> +
> +    rpc->parent_realize(dev, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
> +        return;
> +    }
> +    pci_config_set_interrupt_pin(pci->config, 0);
> +}
> +
> +static void pnv_phb_root_port_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
> +    PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass);
> +
> +    dc->desc     = "IBM PHB PCIE Root Port";
> +
> +    device_class_set_parent_realize(dc, pnv_phb_root_port_realize,
> +                                    &rpc->parent_realize);
> +
> +    device_class_set_parent_reset(dc, pnv_phb_root_port_reset,
> +                                  &rpc->parent_reset);
> +    dc->reset = &pnv_phb_root_port_reset;
> +
> +    dc->user_creatable = true;
> +
> +    k->vendor_id = PCI_VENDOR_ID_IBM;
> +    /* device_id represents the latest PHB root port version supported */
> +    k->device_id = PNV_PHB5_DEVICE_ID;

does that mean powernv8 machines will see phb devices as phb5 devices ?

C.

> +    k->revision  = 0;
> +
> +    rpc->exp_offset = 0x48;
> +    rpc->aer_offset = 0x100;
> +}
> +
> +static const TypeInfo pnv_phb_type_info = {
> +    .name          = TYPE_PNV_PHB,
> +    .parent        = TYPE_PCIE_HOST_BRIDGE,
> +    .instance_size = sizeof(PnvPHB),
> +    .class_init    = pnv_phb_class_init,
> +};
> +
> +static const TypeInfo pnv_phb_root_port_info = {
> +    .name          = TYPE_PNV_PHB_ROOT_PORT,
> +    .parent        = TYPE_PCIE_ROOT_PORT,
> +    .instance_size = sizeof(PnvPHBRootPort),
> +    .class_init    = pnv_phb_root_port_class_init,
> +};
> +
> +static void pnv_phb_register_types(void)
> +{
>       type_register_static(&pnv_phb_type_info);
> +    type_register_static(&pnv_phb_root_port_info);
>   }
> -type_init(pnv_phb_register_type)
> +
> +type_init(pnv_phb_register_types)
> diff --git a/hw/pci-host/pnv_phb.h b/hw/pci-host/pnv_phb.h
> index a7cc8610e2..c8eab4b767 100644
> --- a/hw/pci-host/pnv_phb.h
> +++ b/hw/pci-host/pnv_phb.h
> @@ -36,4 +36,21 @@ struct PnvPHB {
>   #define TYPE_PNV_PHB "pnv-phb"
>   OBJECT_DECLARE_SIMPLE_TYPE(PnvPHB, PNV_PHB)
>   
> +/*
> + * PHB PCIe Root port
> + */
> +#define PNV_PHB3_DEVICE_ID         0x03dc
> +#define PNV_PHB4_DEVICE_ID         0x04c1
> +#define PNV_PHB5_DEVICE_ID         0x0652
> +
> +typedef struct PnvPHBRootPort {
> +    PCIESlot parent_obj;
> +
> +    uint32_t version;
> +} PnvPHBRootPort;
> +
> +#define TYPE_PNV_PHB_ROOT_PORT "pnv-phb-root-port"
> +#define PNV_PHB_ROOT_PORT(obj) \
> +    OBJECT_CHECK(PnvPHBRootPort, obj, TYPE_PNV_PHB_ROOT_PORT)
> +
>   #endif /* PCI_HOST_PNV_PHB_H */