Archipelago » qemu

/*

 * 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, true);

        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)