[Qemu-devel] Re: [PATCH v3 10/13] pcie downstream port: pci express switch downstream port.

[Michael S. Tsirkin]

On Wed, Sep 15, 2010 at 02:38:23PM +0900, Isaku Yamahata wrote:
> pcie switch downstream port.
> 
> Signed-off-by: Isaku Yamahata <address@hidden>
> ---
> Changes v2 -> v3:
> - compilation adjustment.

Same comments as for upstream apply here.

> ---
>  Makefile.objs        |    1 +
>  hw/pcie_downstream.c |  218 
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/pcie_downstream.h |   33 ++++++++
>  3 files changed, 252 insertions(+), 0 deletions(-)
>  create mode 100644 hw/pcie_downstream.c
>  create mode 100644 hw/pcie_downstream.h
> 
> diff --git a/Makefile.objs b/Makefile.objs
> index 72ca8be..baff9ec 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -140,6 +140,7 @@ hw-obj-y =
>  hw-obj-y += vl.o loader.o
>  hw-obj-y += virtio.o virtio-console.o
>  hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o pci_bridge.o 
> pcie_upstream.o
> +hw-obj-y += pcie_downstream.o
>  hw-obj-y += watchdog.o
>  hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o
>  hw-obj-$(CONFIG_ECC) += ecc.o
> diff --git a/hw/pcie_downstream.c b/hw/pcie_downstream.c
> new file mode 100644
> index 0000000..7a629ea
> --- /dev/null
> +++ b/hw/pcie_downstream.c
> @@ -0,0 +1,218 @@
> +/*
> + * pcie_downstream.c
> + *
> + * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
> + *                    VA Linux Systems Japan K.K.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "pci_ids.h"
> +#include "msi.h"
> +#include "pcie.h"
> +#include "pcie_downstream.h"
> +
> +/* For now, TI XIO3130 is borrowed. need to get its own id? */
> +#define PCI_DEVICE_ID_TI_XIO3130D       0x8233  /* downstream port */
> +#define XIO3130_REVISION                0x1
> +#define XIO3130_MSI_OFFSET              0x70
> +#define XIO3130_MSI_SUPPORTED_FLAGS     PCI_MSI_FLAGS_64BIT
> +#define XIO3130_MSI_NR_VECTOR           1
> +#define XIO3130_SSVID_OFFSET            0x80
> +#define XIO3130_SSVID_SVID              0
> +#define XIO3130_SSVID_SSID              0
> +#define XIO3130_EXP_OFFSET              0x90
> +#define XIO3130_AER_OFFSET              0x100
> +
> +#define PCIE_DOWNSTREAM_VID             PCI_VENDOR_ID_TI
> +#define PCIE_DOWNSTREAM_DID             PCI_DEVICE_ID_TI_XIO3130D
> +#define PCIE_DOWNSTREAM_REVISION        XIO3130_REVISION
> +#define PCIE_DOWNSTREAM_MSI_SUPPORTED_FLAGS     XIO3130_MSI_SUPPORTED_FLAGS
> +#define PCIE_DOWNSTREAM_MSI_NR_VECTOR   XIO3130_MSI_NR_VECTOR
> +#define PCIE_DOWNSTREAM_MSI_OFFSET      XIO3130_MSI_OFFSET
> +#define PCIE_DOWNSTREAM_SSVID_OFFSET    XIO3130_SSVID_OFFSET
> +#define PCIE_DOWNSTREAM_SVID            XIO3130_SSVID_SVID
> +#define PCIE_DOWNSTREAM_SSID            XIO3130_SSVID_SSID
> +#define PCIE_DOWNSTREAM_EXP_OFFSET      XIO3130_EXP_OFFSET
> +#define PCIE_DOWNSTREAM_AER_OFFSET      XIO3130_AER_OFFSET
> +
> +static void pcie_downstream_write_config(PCIDevice *d, uint32_t address,
> +                                         uint32_t val, int len)
> +{
> +    uint16_t sltctl =
> +        pci_get_word(d->config + pci_pcie_cap(d) + PCI_EXP_SLTCTL);
> +    uint32_t uncorsta =
> +        pci_get_long(d->config + pcie_aer_cap(d) + PCI_ERR_UNCOR_STATUS);
> +
> +    pci_bridge_write_config(d, address, val, len);
> +    pcie_cap_flr_write_config(d, address, val, len);
> +    pcie_cap_slot_write_config(d, address, val, len, sltctl);
> +    msi_write_config(d, address, val, len);
> +    pcie_aer_write_config(d, address, val, len, uncorsta);
> +}
> +
> +static void pcie_downstream_reset(DeviceState *qdev)
> +{
> +    PCIDevice *d = DO_UPCAST(PCIDevice, qdev, qdev);
> +    msi_reset(d);
> +    pcie_cap_deverr_reset(d);
> +    pcie_cap_slot_reset(d);
> +    pcie_cap_ari_reset(d);
> +    pci_bridge_reset(qdev);
> +}
> +
> +static void pcie_downstream_flr(PCIDevice *d)
> +{
> +    /* TODO: not enabled until qdev reset clean up
> +       waiting for Anthony's qdev cealn up */
> +#if 0
> +    /* So far, sticky bit registers or register which must be preserved
> +       over FLR aren't emulated. So just reset this device. */
> +    pci_device_reset(d);
> +#endif
> +}
> +
> +static int pcie_downstream_initfn(PCIDevice *d)
> +{
> +    PCIBridge* br = DO_UPCAST(PCIBridge, dev, d);
> +    PCIEPort *p = DO_UPCAST(PCIEPort, br, br);
> +    PCIESlot *s = DO_UPCAST(PCIESlot, port, p);
> +    int rc;
> +
> +    rc = pci_bridge_initfn(d);
> +    if (rc < 0) {
> +        return rc;
> +    }
> +
> +    pcie_port_init_reg(d);
> +    pci_config_set_vendor_id(d->config, PCIE_DOWNSTREAM_VID);
> +    pci_config_set_device_id(d->config, PCIE_DOWNSTREAM_DID);
> +    d->config[PCI_REVISION_ID] = PCIE_DOWNSTREAM_REVISION;
> +
> +    rc = msi_init(d, PCIE_DOWNSTREAM_MSI_OFFSET, 
> PCIE_DOWNSTREAM_MSI_NR_VECTOR,
> +                  PCIE_DOWNSTREAM_MSI_SUPPORTED_FLAGS & PCI_MSI_FLAGS_64BIT,
> +                  PCIE_DOWNSTREAM_MSI_SUPPORTED_FLAGS & 
> PCI_MSI_FLAGS_MASKBIT);
> +    if (rc < 0) {
> +        return rc;
> +    }
> +    rc = pci_bridge_ssvid_init(d, PCIE_DOWNSTREAM_SSVID_OFFSET,
> +                               PCIE_DOWNSTREAM_SVID, PCIE_DOWNSTREAM_SSID);
> +    if (rc < 0) {
> +        return rc;
> +    }
> +    rc = pcie_cap_init(d, PCIE_DOWNSTREAM_EXP_OFFSET, 
> PCI_EXP_TYPE_DOWNSTREAM,
> +                       p->port);
> +    if (rc < 0) {
> +        return rc;
> +    }
> +    pcie_cap_flr_init(d, &pcie_downstream_flr);
> +    pcie_cap_deverr_init(d);
> +    pcie_cap_slot_init(d, s->slot);
> +    pcie_chassis_create(s->chassis);
> +    rc = pcie_chassis_add_slot(s);
> +    if (rc < 0) {
> +        return rc;
> +    }
> +    pcie_cap_ari_init(d);
> +    pcie_aer_init(d, PCIE_DOWNSTREAM_AER_OFFSET);
> +
> +    return 0;
> +}
> +
> +static int pcie_downstream_exitfn(PCIDevice *d)
> +{
> +    pcie_aer_exit(d);
> +    msi_uninit(d);
> +    pcie_cap_exit(d);
> +    return pci_bridge_exitfn(d);
> +}
> +
> +PCIESlot *pcie_downstream_init(PCIBus *bus,
> +                               int devfn, bool multifunction,
> +                               const char *bus_name, pci_map_irq_fn map_irq,
> +                               uint8_t port, uint8_t chassis, uint16_t slot)
> +{
> +    PCIDevice *d;
> +    PCIBridge *br;
> +    DeviceState *qdev;
> +
> +    d = pci_create_multifunction(bus, devfn, multifunction,
> +                                 PCIE_DOWNSTREAM_PORT);
> +    if (!d) {
> +        return NULL;
> +    }
> +    br = DO_UPCAST(PCIBridge, dev, d);
> +
> +    qdev = &br->dev.qdev;
> +    pci_bridge_map_irq(br, bus_name, map_irq);
> +    qdev_prop_set_uint8(qdev, "port", port);
> +    qdev_prop_set_uint8(qdev, "chassis", chassis);
> +    qdev_prop_set_uint16(qdev, "slot", slot);
> +    qdev_init_nofail(qdev);
> +
> +    return DO_UPCAST(PCIESlot, port, DO_UPCAST(PCIEPort, br, br));
> +}
> +
> +static const VMStateDescription vmstate_pcie_downstream = {
> +    .name = "pcie-downstream-port",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .minimum_version_id_old = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_PCIE_DEVICE(port.br.dev, PCIESlot),
> +        VMSTATE_STRUCT(port.br.dev.exp.aer_log, PCIESlot, 0,
> +                       vmstate_pcie_aer_log, PCIE_AERLog),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static PCIDeviceInfo pcie_downstream_info = {
> +    .qdev.name = PCIE_DOWNSTREAM_PORT,
> +    .qdev.desc = "Downstream Port of PCI Express Switch",
> +    .qdev.size = sizeof(PCIESlot),
> +    .qdev.reset = pcie_downstream_reset,
> +    .qdev.vmsd = &vmstate_pcie_downstream,
> +
> +    .is_express = 1,
> +    .is_bridge = 1,
> +    .config_write = pcie_downstream_write_config,
> +    .init = pcie_downstream_initfn,
> +    .exit = pcie_downstream_exitfn,
> +
> +    .qdev.props = (Property[]) {
> +        DEFINE_PROP_UINT8("port", PCIESlot, port.port, 0),
> +        DEFINE_PROP_UINT8("chassis", PCIESlot, chassis, 0),
> +        DEFINE_PROP_UINT16("slot", PCIESlot, slot, 0),
> +        DEFINE_PROP_UINT16("aer_log_max", PCIESlot,
> +                           port.br.dev.exp.aer_log.log_max,
> +                           PCIE_AER_LOG_MAX_DEFAULT),
> +        DEFINE_PROP_END_OF_LIST(),
> +    }
> +};
> +
> +static void pcie_downstream_register(void)
> +{
> +    pci_qdev_register(&pcie_downstream_info);
> +}
> +
> +device_init(pcie_downstream_register);
> +
> +/*
> + * Local variables:
> + *  c-indent-level: 4
> + *  c-basic-offset: 4
> + *  tab-width: 8
> + *  indent-tab-mode: nil
> + * End:
> + */
> diff --git a/hw/pcie_downstream.h b/hw/pcie_downstream.h
> new file mode 100644
> index 0000000..686fdac
> --- /dev/null
> +++ b/hw/pcie_downstream.h
> @@ -0,0 +1,33 @@
> +/*
> + * pcie_downstream.h
> + *
> + * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
> + *                    VA Linux Systems Japan K.K.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef QEMU_PCIE_DOWNSTREAM_H
> +#define QEMU_PCIE_DOWNSTREAM_H
> +
> +#include "pcie_port.h"
> +
> +#define PCIE_DOWNSTREAM_PORT    "pcie-downstream-port"
> +
> +PCIESlot *pcie_downstream_init(PCIBus *bus,
> +                               int devfn, bool multifunction,
> +                               const char *bus_name, pci_map_irq_fn map_irq,
> +                               uint8_t port, uint8_t chassis, uint16_t slot);
> +
> +#endif /* QEMU_PCIE_DOWNSTREAM_H */
> -- 
> 1.7.1.1