hw/spapr_pci.c

/*
 * QEMU sPAPR PCI host originated from Uninorth PCI host
 *
 * Copyright (c) 2011 Alexey Kardashevskiy, IBM Corporation.
 * Copyright (C) 2011 David Gibson, IBM Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "hw.h"
#include "pci.h"
#include "msi.h"
#include "msix.h"
#include "pci_host.h"
#include "hw/spapr.h"
#include "hw/spapr_pci.h"
#include "exec-memory.h"
#include <libfdt.h>
#include "trace.h"

#include "hw/pci_internals.h"

/* Copied from the kernel arch/powerpc/platforms/pseries/msi.c */
#define RTAS_QUERY_FN           0
#define RTAS_CHANGE_FN          1
#define RTAS_RESET_FN           2
#define RTAS_CHANGE_MSI_FN      3
#define RTAS_CHANGE_MSIX_FN     4

/* Interrupt types to return on RTAS_CHANGE_* */
#define RTAS_TYPE_MSI           1
#define RTAS_TYPE_MSIX          2

static sPAPRPHBState *find_phb(sPAPREnvironment *spapr, uint64_t buid)
{
    sPAPRPHBState *sphb;

    QLIST_FOREACH(sphb, &spapr->phbs, list) {
        if (sphb->buid != buid) {
            continue;
        }
        return sphb;
    }

    return NULL;
}

static PCIDevice *find_dev(sPAPREnvironment *spapr, uint64_t buid,
                           uint32_t config_addr)
{
    sPAPRPHBState *sphb = find_phb(spapr, buid);
    PCIHostState *phb = PCI_HOST_BRIDGE(sphb);
    BusState *bus = BUS(phb->bus);
    BusChild *kid;
    int devfn = (config_addr >> 8) & 0xFF;

    if (!phb) {
        return NULL;
    }

    QTAILQ_FOREACH(kid, &bus->children, sibling) {
        PCIDevice *dev = (PCIDevice *)kid->child;
        if (dev->devfn == devfn) {
            return dev;
        }
    }

    return NULL;
}

static uint32_t rtas_pci_cfgaddr(uint32_t arg)
{
    /* This handles the encoding of extended config space addresses */
    return ((arg >> 20) & 0xf00) | (arg & 0xff);
}

static void finish_read_pci_config(sPAPREnvironment *spapr, uint64_t buid,
                                   uint32_t addr, uint32_t size,
                                   target_ulong rets)
{
    PCIDevice *pci_dev;
    uint32_t val;

    if ((size != 1) && (size != 2) && (size != 4)) {
        /* access must be 1, 2 or 4 bytes */
        rtas_st(rets, 0, -1);
        return;
    }

    pci_dev = find_dev(spapr, buid, addr);
    addr = rtas_pci_cfgaddr(addr);

    if (!pci_dev || (addr % size) || (addr >= pci_config_size(pci_dev))) {
        /* Access must be to a valid device, within bounds and
         * naturally aligned */
        rtas_st(rets, 0, -1);
        return;
    }

    val = pci_host_config_read_common(pci_dev, addr,
                                      pci_config_size(pci_dev), size);

    rtas_st(rets, 0, 0);
    rtas_st(rets, 1, val);
}

static void rtas_ibm_read_pci_config(sPAPREnvironment *spapr,
                                     uint32_t token, uint32_t nargs,
                                     target_ulong args,
                                     uint32_t nret, target_ulong rets)
{
    uint64_t buid;
    uint32_t size, addr;

    if ((nargs != 4) || (nret != 2)) {
        rtas_st(rets, 0, -1);
        return;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    size = rtas_ld(args, 3);
    addr = rtas_ld(args, 0);

    finish_read_pci_config(spapr, buid, addr, size, rets);
}

static void rtas_read_pci_config(sPAPREnvironment *spapr,
                                 uint32_t token, uint32_t nargs,
                                 target_ulong args,
                                 uint32_t nret, target_ulong rets)
{
    uint32_t size, addr;

    if ((nargs != 2) || (nret != 2)) {
        rtas_st(rets, 0, -1);
        return;
    }

    size = rtas_ld(args, 1);
    addr = rtas_ld(args, 0);

    finish_read_pci_config(spapr, 0, addr, size, rets);
}

static void finish_write_pci_config(sPAPREnvironment *spapr, uint64_t buid,
                                    uint32_t addr, uint32_t size,
                                    uint32_t val, target_ulong rets)
{
    PCIDevice *pci_dev;

    if ((size != 1) && (size != 2) && (size != 4)) {
        /* access must be 1, 2 or 4 bytes */
        rtas_st(rets, 0, -1);
        return;
    }

    pci_dev = find_dev(spapr, buid, addr);
    addr = rtas_pci_cfgaddr(addr);

    if (!pci_dev || (addr % size) || (addr >= pci_config_size(pci_dev))) {
        /* Access must be to a valid device, within bounds and
         * naturally aligned */
        rtas_st(rets, 0, -1);
        return;
    }

    pci_host_config_write_common(pci_dev, addr, pci_config_size(pci_dev),
                                 val, size);

    rtas_st(rets, 0, 0);
}

static void rtas_ibm_write_pci_config(sPAPREnvironment *spapr,
                                      uint32_t token, uint32_t nargs,
                                      target_ulong args,
                                      uint32_t nret, target_ulong rets)
{
    uint64_t buid;
    uint32_t val, size, addr;

    if ((nargs != 5) || (nret != 1)) {
        rtas_st(rets, 0, -1);
        return;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    val = rtas_ld(args, 4);
    size = rtas_ld(args, 3);
    addr = rtas_ld(args, 0);

    finish_write_pci_config(spapr, buid, addr, size, val, rets);
}

static void rtas_write_pci_config(sPAPREnvironment *spapr,
                                  uint32_t token, uint32_t nargs,
                                  target_ulong args,
                                  uint32_t nret, target_ulong rets)
{
    uint32_t val, size, addr;

    if ((nargs != 3) || (nret != 1)) {
        rtas_st(rets, 0, -1);
        return;
    }


    val = rtas_ld(args, 2);
    size = rtas_ld(args, 1);
    addr = rtas_ld(args, 0);

    finish_write_pci_config(spapr, 0, addr, size, val, rets);
}

/*
 * Find an entry with config_addr or returns the empty one if not found AND
 * alloc_new is set.
 * At the moment the msi_table entries are never released so there is
 * no point to look till the end of the list if we need to find the free entry.
 */
static int spapr_msicfg_find(sPAPRPHBState *phb, uint32_t config_addr,
                             bool alloc_new)
{
    int i;

    for (i = 0; i < SPAPR_MSIX_MAX_DEVS; ++i) {
        if (!phb->msi_table[i].nvec) {
            break;
        }
        if (phb->msi_table[i].config_addr == config_addr) {
            return i;
        }
    }
    if ((i < SPAPR_MSIX_MAX_DEVS) && alloc_new) {
        trace_spapr_pci_msi("Allocating new MSI config", i, config_addr);
        return i;
    }

    return -1;
}

/*
 * Set MSI/MSIX message data.
 * This is required for msi_notify()/msix_notify() which
 * will write at the addresses via spapr_msi_write().
 */
static void spapr_msi_setmsg(PCIDevice *pdev, hwaddr addr,
                             bool msix, unsigned req_num)
{
    unsigned i;
    MSIMessage msg = { .address = addr, .data = 0 };

    if (!msix) {
        msi_set_message(pdev, msg);
        trace_spapr_pci_msi_setup(pdev->name, 0, msg.address);
        return;
    }

    for (i = 0; i < req_num; ++i) {
        msg.address = addr | (i << 2);
        msix_set_message(pdev, i, msg);
        trace_spapr_pci_msi_setup(pdev->name, i, msg.address);
    }
}

static void rtas_ibm_change_msi(sPAPREnvironment *spapr,
                                uint32_t token, uint32_t nargs,
                                target_ulong args, uint32_t nret,
                                target_ulong rets)
{
    uint32_t config_addr = rtas_ld(args, 0);
    uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    unsigned int func = rtas_ld(args, 3);
    unsigned int req_num = rtas_ld(args, 4); /* 0 == remove all */
    unsigned int seq_num = rtas_ld(args, 5);
    unsigned int ret_intr_type;
    int ndev, irq;
    sPAPRPHBState *phb = NULL;
    PCIDevice *pdev = NULL;

    switch (func) {
    case RTAS_CHANGE_MSI_FN:
    case RTAS_CHANGE_FN:
        ret_intr_type = RTAS_TYPE_MSI;
        break;
    case RTAS_CHANGE_MSIX_FN:
        ret_intr_type = RTAS_TYPE_MSIX;
        break;
    default:
        fprintf(stderr, "rtas_ibm_change_msi(%u) is not implemented\n", func);
        rtas_st(rets, 0, -3); /* Parameter error */
        return;
    }

    /* Fins sPAPRPHBState */
    phb = find_phb(spapr, buid);
    if (phb) {
        pdev = find_dev(spapr, buid, config_addr);
    }
    if (!phb || !pdev) {
        rtas_st(rets, 0, -3); /* Parameter error */
        return;
    }

    /* Releasing MSIs */
    if (!req_num) {
        ndev = spapr_msicfg_find(phb, config_addr, false);
        if (ndev < 0) {
            trace_spapr_pci_msi("MSI has not been enabled", -1, config_addr);
            rtas_st(rets, 0, -1); /* Hardware error */
            return;
        }
        trace_spapr_pci_msi("Released MSIs", ndev, config_addr);
        rtas_st(rets, 0, 0);
        rtas_st(rets, 1, 0);
        return;
    }

    /* Enabling MSI */

    /* Find a device number in the map to add or reuse the existing one */
    ndev = spapr_msicfg_find(phb, config_addr, true);
    if (ndev >= SPAPR_MSIX_MAX_DEVS || ndev < 0) {
        fprintf(stderr, "No free entry for a new MSI device\n");
        rtas_st(rets, 0, -1); /* Hardware error */
        return;
    }
    trace_spapr_pci_msi("Configuring MSI", ndev, config_addr);

    /* Check if there is an old config and MSI number has not changed */
    if (phb->msi_table[ndev].nvec && (req_num != phb->msi_table[ndev].nvec)) {
        /* Unexpected behaviour */
        fprintf(stderr, "Cannot reuse MSI config for device#%d", ndev);
        rtas_st(rets, 0, -1); /* Hardware error */
        return;
    }

    /* There is no cached config, allocate MSIs */
    if (!phb->msi_table[ndev].nvec) {
        irq = spapr_allocate_irq_block(req_num, false);
        if (irq < 0) {
            fprintf(stderr, "Cannot allocate MSIs for device#%d", ndev);
            rtas_st(rets, 0, -1); /* Hardware error */
            return;
        }
        phb->msi_table[ndev].irq = irq;
        phb->msi_table[ndev].nvec = req_num;
        phb->msi_table[ndev].config_addr = config_addr;
    }

    /* Setup MSI/MSIX vectors in the device (via cfgspace or MSIX BAR) */
    spapr_msi_setmsg(pdev, phb->msi_win_addr | (ndev << 16),
                     ret_intr_type == RTAS_TYPE_MSIX, req_num);

    rtas_st(rets, 0, 0);
    rtas_st(rets, 1, req_num);
    rtas_st(rets, 2, ++seq_num);
    rtas_st(rets, 3, ret_intr_type);

    trace_spapr_pci_rtas_ibm_change_msi(func, req_num);
}

static void rtas_ibm_query_interrupt_source_number(sPAPREnvironment *spapr,
                                                   uint32_t token,
                                                   uint32_t nargs,
                                                   target_ulong args,
                                                   uint32_t nret,
                                                   target_ulong rets)
{
    uint32_t config_addr = rtas_ld(args, 0);
    uint64_t buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    unsigned int intr_src_num = -1, ioa_intr_num = rtas_ld(args, 3);
    int ndev;
    sPAPRPHBState *phb = NULL;

    /* Fins sPAPRPHBState */
    phb = find_phb(spapr, buid);
    if (!phb) {
        rtas_st(rets, 0, -3); /* Parameter error */
        return;
    }

    /* Find device descriptor and start IRQ */
    ndev = spapr_msicfg_find(phb, config_addr, false);
    if (ndev < 0) {
        trace_spapr_pci_msi("MSI has not been enabled", -1, config_addr);
        rtas_st(rets, 0, -1); /* Hardware error */
        return;
    }

    intr_src_num = phb->msi_table[ndev].irq + ioa_intr_num;
    trace_spapr_pci_rtas_ibm_query_interrupt_source_number(ioa_intr_num,
                                                           intr_src_num);

    rtas_st(rets, 0, 0);
    rtas_st(rets, 1, intr_src_num);
    rtas_st(rets, 2, 1);/* 0 == level; 1 == edge */
}

static int pci_spapr_swizzle(int slot, int pin)
{
    return (slot + pin) % PCI_NUM_PINS;
}

static int pci_spapr_map_irq(PCIDevice *pci_dev, int irq_num)
{
    /*
     * Here we need to convert pci_dev + irq_num to some unique value
     * which is less than number of IRQs on the specific bus (4).  We
     * use standard PCI swizzling, that is (slot number + pin number)
     * % 4.
     */
    return pci_spapr_swizzle(PCI_SLOT(pci_dev->devfn), irq_num);
}

static void pci_spapr_set_irq(void *opaque, int irq_num, int level)
{
    /*
     * Here we use the number returned by pci_spapr_map_irq to find a
     * corresponding qemu_irq.
     */
    sPAPRPHBState *phb = opaque;

    trace_spapr_pci_lsi_set(phb->busname, irq_num, phb->lsi_table[irq_num].irq);
    qemu_set_irq(spapr_phb_lsi_qirq(phb, irq_num), level);
}

static uint64_t spapr_io_read(void *opaque, hwaddr addr,
                              unsigned size)
{
    switch (size) {
    case 1:
        return cpu_inb(addr);
    case 2:
        return cpu_inw(addr);
    case 4:
        return cpu_inl(addr);
    }
    assert(0);
}

static void spapr_io_write(void *opaque, hwaddr addr,
                           uint64_t data, unsigned size)
{
    switch (size) {
    case 1:
        cpu_outb(addr, data);
        return;
    case 2:
        cpu_outw(addr, data);
        return;
    case 4:
        cpu_outl(addr, data);
        return;
    }
    assert(0);
}

static const MemoryRegionOps spapr_io_ops = {
    .endianness = DEVICE_LITTLE_ENDIAN,
    .read = spapr_io_read,
    .write = spapr_io_write
};

/*
 * MSI/MSIX memory region implementation.
 * The handler handles both MSI and MSIX.
 * For MSI-X, the vector number is encoded as a part of the address,
 * data is set to 0.
 * For MSI, the vector number is encoded in least bits in data.
 */
static void spapr_msi_write(void *opaque, hwaddr addr,
                            uint64_t data, unsigned size)
{
    sPAPRPHBState *phb = opaque;
    int ndev = addr >> 16;
    int vec = ((addr & 0xFFFF) >> 2) | data;
    uint32_t irq = phb->msi_table[ndev].irq + vec;

    trace_spapr_pci_msi_write(addr, data, irq);

    qemu_irq_pulse(xics_get_qirq(spapr->icp, irq));
}

static const MemoryRegionOps spapr_msi_ops = {
    /* There is no .read as the read result is undefined by PCI spec */
    .read = NULL,
    .write = spapr_msi_write,
    .endianness = DEVICE_LITTLE_ENDIAN
};

/*
 * PHB PCI device
 */
static DMAContext *spapr_pci_dma_context_fn(PCIBus *bus, void *opaque,
                                            int devfn)
{
    sPAPRPHBState *phb = opaque;

    return phb->dma;
}

static int spapr_phb_init(SysBusDevice *s)
{
    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
    PCIHostState *phb = PCI_HOST_BRIDGE(s);
    char *namebuf;
    int i;
    PCIBus *bus;

    sphb->dtbusname = g_strdup_printf("pci@%" PRIx64, sphb->buid);
    namebuf = alloca(strlen(sphb->dtbusname) + 32);

    /* Initialize memory regions */
    sprintf(namebuf, "%s.mmio", sphb->dtbusname);
    memory_region_init(&sphb->memspace, namebuf, INT64_MAX);

    sprintf(namebuf, "%s.mmio-alias", sphb->dtbusname);
    memory_region_init_alias(&sphb->memwindow, namebuf, &sphb->memspace,
                             SPAPR_PCI_MEM_WIN_BUS_OFFSET, sphb->mem_win_size);
    memory_region_add_subregion(get_system_memory(), sphb->mem_win_addr,
                                &sphb->memwindow);

    /* On ppc, we only have MMIO no specific IO space from the CPU
     * perspective.  In theory we ought to be able to embed the PCI IO
     * memory region direction in the system memory space.  However,
     * if any of the IO BAR subregions use the old_portio mechanism,
     * that won't be processed properly unless accessed from the
     * system io address space.  This hack to bounce things via
     * system_io works around the problem until all the users of
     * old_portion are updated */
    sprintf(namebuf, "%s.io", sphb->dtbusname);
    memory_region_init(&sphb->iospace, namebuf, SPAPR_PCI_IO_WIN_SIZE);
    /* FIXME: fix to support multiple PHBs */
    memory_region_add_subregion(get_system_io(), 0, &sphb->iospace);

    sprintf(namebuf, "%s.io-alias", sphb->dtbusname);
    memory_region_init_io(&sphb->iowindow, &spapr_io_ops, sphb,
                          namebuf, SPAPR_PCI_IO_WIN_SIZE);
    memory_region_add_subregion(get_system_memory(), sphb->io_win_addr,
                                &sphb->iowindow);

    /* As MSI/MSIX interrupts trigger by writing at MSI/MSIX vectors,
     * we need to allocate some memory to catch those writes coming
     * from msi_notify()/msix_notify() */
    if (msi_supported) {
        sprintf(namebuf, "%s.msi", sphb->dtbusname);
        memory_region_init_io(&sphb->msiwindow, &spapr_msi_ops, sphb,
                              namebuf, SPAPR_MSIX_MAX_DEVS * 0x10000);
        memory_region_add_subregion(get_system_memory(), sphb->msi_win_addr,
                                    &sphb->msiwindow);
    }

    bus = pci_register_bus(DEVICE(s),
                           sphb->busname ? sphb->busname : sphb->dtbusname,
                           pci_spapr_set_irq, pci_spapr_map_irq, sphb,
                           &sphb->memspace, &sphb->iospace,
                           PCI_DEVFN(0, 0), PCI_NUM_PINS);
    phb->bus = bus;

    sphb->dma_liobn = SPAPR_PCI_BASE_LIOBN | (pci_find_domain(bus) << 16);
    sphb->dma_window_start = 0;
    sphb->dma_window_size = 0x40000000;
    sphb->dma = spapr_tce_new_dma_context(sphb->dma_liobn, sphb->dma_window_size);
    pci_setup_iommu(bus, spapr_pci_dma_context_fn, sphb);

    QLIST_INSERT_HEAD(&spapr->phbs, sphb, list);

    /* Initialize the LSI table */
    for (i = 0; i < PCI_NUM_PINS; i++) {
        uint32_t irq;

        irq = spapr_allocate_lsi(0);
        if (!irq) {
            return -1;
        }

        sphb->lsi_table[i].irq = irq;
    }

    return 0;
}

static void spapr_phb_reset(DeviceState *qdev)
{
    SysBusDevice *s = sysbus_from_qdev(qdev);
    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);

    /* Reset the IOMMU state */
    spapr_tce_reset(sphb->dma);
}

static Property spapr_phb_properties[] = {
    DEFINE_PROP_HEX64("buid", sPAPRPHBState, buid, 0),
    DEFINE_PROP_STRING("busname", sPAPRPHBState, busname),
    DEFINE_PROP_HEX64("mem_win_addr", sPAPRPHBState, mem_win_addr, 0),
    DEFINE_PROP_HEX64("mem_win_size", sPAPRPHBState, mem_win_size, 0x20000000),
    DEFINE_PROP_HEX64("io_win_addr", sPAPRPHBState, io_win_addr, 0),
    DEFINE_PROP_HEX64("io_win_size", sPAPRPHBState, io_win_size, 0x10000),
    DEFINE_PROP_HEX64("msi_win_addr", sPAPRPHBState, msi_win_addr, 0),
    DEFINE_PROP_END_OF_LIST(),
};

static void spapr_phb_class_init(ObjectClass *klass, void *data)
{
    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
    DeviceClass *dc = DEVICE_CLASS(klass);

    sdc->init = spapr_phb_init;
    dc->props = spapr_phb_properties;
    dc->reset = spapr_phb_reset;
}

static const TypeInfo spapr_phb_info = {
    .name          = TYPE_SPAPR_PCI_HOST_BRIDGE,
    .parent        = TYPE_PCI_HOST_BRIDGE,
    .instance_size = sizeof(sPAPRPHBState),
    .class_init    = spapr_phb_class_init,
};

void spapr_create_phb(sPAPREnvironment *spapr,
                      const char *busname, uint64_t buid,
                      uint64_t mem_win_addr, uint64_t mem_win_size,
                      uint64_t io_win_addr, uint64_t msi_win_addr)
{
    DeviceState *dev;

    dev = qdev_create(NULL, TYPE_SPAPR_PCI_HOST_BRIDGE);

    if (busname) {
        qdev_prop_set_string(dev, "busname", g_strdup(busname));
    }
    qdev_prop_set_uint64(dev, "buid", buid);
    qdev_prop_set_uint64(dev, "mem_win_addr", mem_win_addr);
    qdev_prop_set_uint64(dev, "mem_win_size", mem_win_size);
    qdev_prop_set_uint64(dev, "io_win_addr", io_win_addr);
    qdev_prop_set_uint64(dev, "msi_win_addr", msi_win_addr);

    qdev_init_nofail(dev);
}

/* Macros to operate with address in OF binding to PCI */
#define b_x(x, p, l)    (((x) & ((1<<(l))-1)) << (p))
#define b_n(x)          b_x((x), 31, 1) /* 0 if relocatable */
#define b_p(x)          b_x((x), 30, 1) /* 1 if prefetchable */
#define b_t(x)          b_x((x), 29, 1) /* 1 if the address is aliased */
#define b_ss(x)         b_x((x), 24, 2) /* the space code */
#define b_bbbbbbbb(x)   b_x((x), 16, 8) /* bus number */
#define b_ddddd(x)      b_x((x), 11, 5) /* device number */
#define b_fff(x)        b_x((x), 8, 3)  /* function number */
#define b_rrrrrrrr(x)   b_x((x), 0, 8)  /* register number */

int spapr_populate_pci_dt(sPAPRPHBState *phb,
                          uint32_t xics_phandle,
                          void *fdt)
{
    int bus_off, i, j;
    char nodename[256];
    uint32_t bus_range[] = { cpu_to_be32(0), cpu_to_be32(0xff) };
    struct {
        uint32_t hi;
        uint64_t child;
        uint64_t parent;
        uint64_t size;
    } QEMU_PACKED ranges[] = {
        {
            cpu_to_be32(b_ss(1)), cpu_to_be64(0),
            cpu_to_be64(phb->io_win_addr),
            cpu_to_be64(memory_region_size(&phb->iospace)),
        },
        {
            cpu_to_be32(b_ss(2)), cpu_to_be64(SPAPR_PCI_MEM_WIN_BUS_OFFSET),
            cpu_to_be64(phb->mem_win_addr),
            cpu_to_be64(memory_region_size(&phb->memwindow)),
        },
    };
    uint64_t bus_reg[] = { cpu_to_be64(phb->buid), 0 };
    uint32_t interrupt_map_mask[] = {
        cpu_to_be32(b_ddddd(-1)|b_fff(0)), 0x0, 0x0, cpu_to_be32(-1)};
    uint32_t interrupt_map[PCI_SLOT_MAX * PCI_NUM_PINS][7];

    /* Start populating the FDT */
    sprintf(nodename, "pci@%" PRIx64, phb->buid);
    bus_off = fdt_add_subnode(fdt, 0, nodename);
    if (bus_off < 0) {
        return bus_off;
    }

#define _FDT(exp) \
    do { \
        int ret = (exp);                                           \
        if (ret < 0) {                                             \
            return ret;                                            \
        }                                                          \
    } while (0)

    /* Write PHB properties */
    _FDT(fdt_setprop_string(fdt, bus_off, "device_type", "pci"));
    _FDT(fdt_setprop_string(fdt, bus_off, "compatible", "IBM,Logical_PHB"));
    _FDT(fdt_setprop_cell(fdt, bus_off, "#address-cells", 0x3));
    _FDT(fdt_setprop_cell(fdt, bus_off, "#size-cells", 0x2));
    _FDT(fdt_setprop_cell(fdt, bus_off, "#interrupt-cells", 0x1));
    _FDT(fdt_setprop(fdt, bus_off, "used-by-rtas", NULL, 0));
    _FDT(fdt_setprop(fdt, bus_off, "bus-range", &bus_range, sizeof(bus_range)));
    _FDT(fdt_setprop(fdt, bus_off, "ranges", &ranges, sizeof(ranges)));
    _FDT(fdt_setprop(fdt, bus_off, "reg", &bus_reg, sizeof(bus_reg)));
    _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pci-config-space-type", 0x1));

    /* Build the interrupt-map, this must matches what is done
     * in pci_spapr_map_irq
     */
    _FDT(fdt_setprop(fdt, bus_off, "interrupt-map-mask",
                     &interrupt_map_mask, sizeof(interrupt_map_mask)));
    for (i = 0; i < PCI_SLOT_MAX; i++) {
        for (j = 0; j < PCI_NUM_PINS; j++) {
            uint32_t *irqmap = interrupt_map[i*PCI_NUM_PINS + j];
            int lsi_num = pci_spapr_swizzle(i, j);

            irqmap[0] = cpu_to_be32(b_ddddd(i)|b_fff(0));
            irqmap[1] = 0;
            irqmap[2] = 0;
            irqmap[3] = cpu_to_be32(j+1);
            irqmap[4] = cpu_to_be32(xics_phandle);
            irqmap[5] = cpu_to_be32(phb->lsi_table[lsi_num].irq);
            irqmap[6] = cpu_to_be32(0x8);
        }
    }
    /* Write interrupt map */
    _FDT(fdt_setprop(fdt, bus_off, "interrupt-map", &interrupt_map,
                     sizeof(interrupt_map)));

    spapr_dma_dt(fdt, bus_off, "ibm,dma-window",
                 phb->dma_liobn, phb->dma_window_start,
                 phb->dma_window_size);

    return 0;
}

void spapr_pci_rtas_init(void)
{
    spapr_rtas_register("read-pci-config", rtas_read_pci_config);
    spapr_rtas_register("write-pci-config", rtas_write_pci_config);
    spapr_rtas_register("ibm,read-pci-config", rtas_ibm_read_pci_config);
    spapr_rtas_register("ibm,write-pci-config", rtas_ibm_write_pci_config);
    if (msi_supported) {
        spapr_rtas_register("ibm,query-interrupt-source-number",
                            rtas_ibm_query_interrupt_source_number);
        spapr_rtas_register("ibm,change-msi", rtas_ibm_change_msi);
    }
}

static void spapr_pci_register_types(void)
{
    type_register_static(&spapr_phb_info);
}

type_init(spapr_pci_register_types)