/*
 * 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/hw.h"
#include "hw/pci/pci.h"
#include "hw/pci/msi.h"
#include "hw/pci/msix.h"
#include "hw/pci/pci_host.h"
#include "hw/ppc/spapr.h"
#include "hw/pci-host/spapr.h"
#include "exec/address-spaces.h"
#include <libfdt.h>
#include "trace.h"
#include "qemu/error-report.h"

#include "hw/pci/pci_bus.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);
    int bus_num = (config_addr >> 16) & 0xFF;
    int devfn = (config_addr >> 8) & 0xFF;

    if (!phb) {
        return NULL;
    }

    return pci_find_device(phb->bus, bus_num, devfn);
}

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, RTAS_OUT_HW_ERROR);
        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, RTAS_OUT_HW_ERROR);
        return;
    }

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

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

static void rtas_ibm_read_pci_config(PowerPCCPU *cpu, 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, RTAS_OUT_HW_ERROR);
        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(PowerPCCPU *cpu, 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, RTAS_OUT_HW_ERROR);
        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, RTAS_OUT_HW_ERROR);
        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, RTAS_OUT_HW_ERROR);
        return;
    }

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

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}

static void rtas_ibm_write_pci_config(PowerPCCPU *cpu, 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, RTAS_OUT_HW_ERROR);
        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(PowerPCCPU *cpu, 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, RTAS_OUT_HW_ERROR);
        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);
}

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

    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) {
        msix_set_message(pdev, i, msg);
        trace_spapr_pci_msi_setup(pdev->name, i, msg.address);
        if (addr) {
            ++msg.data;
        }
    }
}

static void rtas_ibm_change_msi(PowerPCCPU *cpu, 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;
    unsigned int irq, max_irqs = 0, num = 0;
    sPAPRPHBState *phb = NULL;
    PCIDevice *pdev = NULL;
    spapr_pci_msi *msi;
    int *config_addr_key;

    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:
        error_report("rtas_ibm_change_msi(%u) is not implemented", func);
        rtas_st(rets, 0, RTAS_OUT_PARAM_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, RTAS_OUT_PARAM_ERROR);
        return;
    }

    /* Releasing MSIs */
    if (!req_num) {
        msi = (spapr_pci_msi *) g_hash_table_lookup(phb->msi, &config_addr);
        if (!msi) {
            trace_spapr_pci_msi("Releasing wrong config", config_addr);
            rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
            return;
        }

        xics_free(spapr->icp, msi->first_irq, msi->num);
        if (msi_present(pdev)) {
            spapr_msi_setmsg(pdev, 0, false, 0, num);
        }
        if (msix_present(pdev)) {
            spapr_msi_setmsg(pdev, 0, true, 0, num);
        }
        g_hash_table_remove(phb->msi, &config_addr);

        trace_spapr_pci_msi("Released MSIs", config_addr);
        rtas_st(rets, 0, RTAS_OUT_SUCCESS);
        rtas_st(rets, 1, 0);
        return;
    }

    /* Enabling MSI */

    /* Check if the device supports as many IRQs as requested */
    if (ret_intr_type == RTAS_TYPE_MSI) {
        max_irqs = msi_nr_vectors_allocated(pdev);
    } else if (ret_intr_type == RTAS_TYPE_MSIX) {
        max_irqs = pdev->msix_entries_nr;
    }
    if (!max_irqs) {
        error_report("Requested interrupt type %d is not enabled for device %x",
                     ret_intr_type, config_addr);
        rtas_st(rets, 0, -1); /* Hardware error */
        return;
    }
    /* Correct the number if the guest asked for too many */
    if (req_num > max_irqs) {
        trace_spapr_pci_msi_retry(config_addr, req_num, max_irqs);
        req_num = max_irqs;
        irq = 0; /* to avoid misleading trace */
        goto out;
    }

    /* Allocate MSIs */
    irq = xics_alloc_block(spapr->icp, 0, req_num, false,
                           ret_intr_type == RTAS_TYPE_MSI);
    if (!irq) {
        error_report("Cannot allocate MSIs for device %x", config_addr);
        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
        return;
    }

    /* Setup MSI/MSIX vectors in the device (via cfgspace or MSIX BAR) */
    spapr_msi_setmsg(pdev, SPAPR_PCI_MSI_WINDOW, ret_intr_type == RTAS_TYPE_MSIX,
                     irq, req_num);

    /* Add MSI device to cache */
    msi = g_new(spapr_pci_msi, 1);
    msi->first_irq = irq;
    msi->num = req_num;
    config_addr_key = g_new(int, 1);
    *config_addr_key = config_addr;
    g_hash_table_insert(phb->msi, config_addr_key, msi);

out:
    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
    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(config_addr, func, req_num, irq);
}

static void rtas_ibm_query_interrupt_source_number(PowerPCCPU *cpu,
                                                   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);
    sPAPRPHBState *phb = NULL;
    PCIDevice *pdev = NULL;
    spapr_pci_msi *msi;

    /* Find sPAPRPHBState */
    phb = find_phb(spapr, buid);
    if (phb) {
        pdev = find_dev(spapr, buid, config_addr);
    }
    if (!phb || !pdev) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }

    /* Find device descriptor and start IRQ */
    msi = (spapr_pci_msi *) g_hash_table_lookup(phb->msi, &config_addr);
    if (!msi || !msi->first_irq || !msi->num || (ioa_intr_num >= msi->num)) {
        trace_spapr_pci_msi("Failed to return vector", config_addr);
        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
        return;
    }
    intr_src_num = msi->first_irq + ioa_intr_num;
    trace_spapr_pci_rtas_ibm_query_interrupt_source_number(ioa_intr_num,
                                                           intr_src_num);

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

static void rtas_ibm_set_eeh_option(PowerPCCPU *cpu,
                                    sPAPREnvironment *spapr,
                                    uint32_t token, uint32_t nargs,
                                    target_ulong args, uint32_t nret,
                                    target_ulong rets)
{
    sPAPRPHBState *sphb;
    sPAPRPHBClass *spc;
    uint32_t addr, option;
    uint64_t buid;
    int ret;

    if ((nargs != 4) || (nret != 1)) {
        goto param_error_exit;
    }

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

    sphb = find_phb(spapr, buid);
    if (!sphb) {
        goto param_error_exit;
    }

    spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
    if (!spc->eeh_set_option) {
        goto param_error_exit;
    }

    ret = spc->eeh_set_option(sphb, addr, option);
    rtas_st(rets, 0, ret);
    return;

param_error_exit:
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

static void rtas_ibm_get_config_addr_info2(PowerPCCPU *cpu,
                                           sPAPREnvironment *spapr,
                                           uint32_t token, uint32_t nargs,
                                           target_ulong args, uint32_t nret,
                                           target_ulong rets)
{
    sPAPRPHBState *sphb;
    sPAPRPHBClass *spc;
    PCIDevice *pdev;
    uint32_t addr, option;
    uint64_t buid;

    if ((nargs != 4) || (nret != 2)) {
        goto param_error_exit;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    sphb = find_phb(spapr, buid);
    if (!sphb) {
        goto param_error_exit;
    }

    spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
    if (!spc->eeh_set_option) {
        goto param_error_exit;
    }

    /*
     * We always have PE address of form "00BB0001". "BB"
     * represents the bus number of PE's primary bus.
     */
    option = rtas_ld(args, 3);
    switch (option) {
    case RTAS_GET_PE_ADDR:
        addr = rtas_ld(args, 0);
        pdev = find_dev(spapr, buid, addr);
        if (!pdev) {
            goto param_error_exit;
        }

        rtas_st(rets, 1, (pci_bus_num(pdev->bus) << 16) + 1);
        break;
    case RTAS_GET_PE_MODE:
        rtas_st(rets, 1, RTAS_PE_MODE_SHARED);
        break;
    default:
        goto param_error_exit;
    }

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
    return;

param_error_exit:
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

static void rtas_ibm_read_slot_reset_state2(PowerPCCPU *cpu,
                                            sPAPREnvironment *spapr,
                                            uint32_t token, uint32_t nargs,
                                            target_ulong args, uint32_t nret,
                                            target_ulong rets)
{
    sPAPRPHBState *sphb;
    sPAPRPHBClass *spc;
    uint64_t buid;
    int state, ret;

    if ((nargs != 3) || (nret != 4 && nret != 5)) {
        goto param_error_exit;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    sphb = find_phb(spapr, buid);
    if (!sphb) {
        goto param_error_exit;
    }

    spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
    if (!spc->eeh_get_state) {
        goto param_error_exit;
    }

    ret = spc->eeh_get_state(sphb, &state);
    rtas_st(rets, 0, ret);
    if (ret != RTAS_OUT_SUCCESS) {
        return;
    }

    rtas_st(rets, 1, state);
    rtas_st(rets, 2, RTAS_EEH_SUPPORT);
    rtas_st(rets, 3, RTAS_EEH_PE_UNAVAIL_INFO);
    if (nret >= 5) {
        rtas_st(rets, 4, RTAS_EEH_PE_RECOVER_INFO);
    }
    return;

param_error_exit:
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

static void rtas_ibm_set_slot_reset(PowerPCCPU *cpu,
                                    sPAPREnvironment *spapr,
                                    uint32_t token, uint32_t nargs,
                                    target_ulong args, uint32_t nret,
                                    target_ulong rets)
{
    sPAPRPHBState *sphb;
    sPAPRPHBClass *spc;
    uint32_t option;
    uint64_t buid;
    int ret;

    if ((nargs != 4) || (nret != 1)) {
        goto param_error_exit;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    option = rtas_ld(args, 3);
    sphb = find_phb(spapr, buid);
    if (!sphb) {
        goto param_error_exit;
    }

    spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
    if (!spc->eeh_reset) {
        goto param_error_exit;
    }

    ret = spc->eeh_reset(sphb, option);
    rtas_st(rets, 0, ret);
    return;

param_error_exit:
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

static void rtas_ibm_configure_pe(PowerPCCPU *cpu,
                                  sPAPREnvironment *spapr,
                                  uint32_t token, uint32_t nargs,
                                  target_ulong args, uint32_t nret,
                                  target_ulong rets)
{
    sPAPRPHBState *sphb;
    sPAPRPHBClass *spc;
    uint64_t buid;
    int ret;

    if ((nargs != 3) || (nret != 1)) {
        goto param_error_exit;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    sphb = find_phb(spapr, buid);
    if (!sphb) {
        goto param_error_exit;
    }

    spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
    if (!spc->eeh_configure) {
        goto param_error_exit;
    }

    ret = spc->eeh_configure(sphb);
    rtas_st(rets, 0, ret);
    return;

param_error_exit:
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

/* To support it later */
static void rtas_ibm_slot_error_detail(PowerPCCPU *cpu,
                                       sPAPREnvironment *spapr,
                                       uint32_t token, uint32_t nargs,
                                       target_ulong args, uint32_t nret,
                                       target_ulong rets)
{
    sPAPRPHBState *sphb;
    sPAPRPHBClass *spc;
    int option;
    uint64_t buid;

    if ((nargs != 8) || (nret != 1)) {
        goto param_error_exit;
    }

    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
    sphb = find_phb(spapr, buid);
    if (!sphb) {
        goto param_error_exit;
    }

    spc = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(sphb);
    if (!spc->eeh_set_option) {
        goto param_error_exit;
    }

    option = rtas_ld(args, 7);
    switch (option) {
    case RTAS_SLOT_TEMP_ERR_LOG:
    case RTAS_SLOT_PERM_ERR_LOG:
        break;
    default:
        goto param_error_exit;
    }

    /* We don't have error log yet */
    rtas_st(rets, 0, RTAS_OUT_NO_ERRORS_FOUND);
    return;

param_error_exit:
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

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

static PCIINTxRoute spapr_route_intx_pin_to_irq(void *opaque, int pin)
{
    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(opaque);
    PCIINTxRoute route;

    route.mode = PCI_INTX_ENABLED;
    route.irq = sphb->lsi_table[pin].irq;

    return route;
}

/*
 * 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)
{
    uint32_t irq = data;

    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 AddressSpace *spapr_pci_dma_iommu(PCIBus *bus, void *opaque, int devfn)
{
    sPAPRPHBState *phb = opaque;

    return &phb->iommu_as;
}

static void spapr_phb_realize(DeviceState *dev, Error **errp)
{
    SysBusDevice *s = SYS_BUS_DEVICE(dev);
    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
    PCIHostState *phb = PCI_HOST_BRIDGE(s);
    sPAPRPHBClass *info = SPAPR_PCI_HOST_BRIDGE_GET_CLASS(s);
    char *namebuf;
    int i;
    PCIBus *bus;
    uint64_t msi_window_size = 4096;

    if (sphb->index != -1) {
        hwaddr windows_base;

        if ((sphb->buid != -1) || (sphb->dma_liobn != -1)
            || (sphb->mem_win_addr != -1)
            || (sphb->io_win_addr != -1)) {
            error_setg(errp, "Either \"index\" or other parameters must"
                       " be specified for PAPR PHB, not both");
            return;
        }

        if (sphb->index > SPAPR_PCI_MAX_INDEX) {
            error_setg(errp, "\"index\" for PAPR PHB is too large (max %u)",
                       SPAPR_PCI_MAX_INDEX);
            return;
        }

        sphb->buid = SPAPR_PCI_BASE_BUID + sphb->index;
        sphb->dma_liobn = SPAPR_PCI_BASE_LIOBN + sphb->index;

        windows_base = SPAPR_PCI_WINDOW_BASE
            + sphb->index * SPAPR_PCI_WINDOW_SPACING;
        sphb->mem_win_addr = windows_base + SPAPR_PCI_MMIO_WIN_OFF;
        sphb->io_win_addr = windows_base + SPAPR_PCI_IO_WIN_OFF;
    }

    if (sphb->buid == -1) {
        error_setg(errp, "BUID not specified for PHB");
        return;
    }

    if (sphb->dma_liobn == -1) {
        error_setg(errp, "LIOBN not specified for PHB");
        return;
    }

    if (sphb->mem_win_addr == -1) {
        error_setg(errp, "Memory window address not specified for PHB");
        return;
    }

    if (sphb->io_win_addr == -1) {
        error_setg(errp, "IO window address not specified for PHB");
        return;
    }

    if (find_phb(spapr, sphb->buid)) {
        error_setg(errp, "PCI host bridges must have unique BUIDs");
        return;
    }

    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, OBJECT(sphb), namebuf, UINT64_MAX);

    sprintf(namebuf, "%s.mmio-alias", sphb->dtbusname);
    memory_region_init_alias(&sphb->memwindow, OBJECT(sphb),
                             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);

    /* Initialize IO regions */
    sprintf(namebuf, "%s.io", sphb->dtbusname);
    memory_region_init(&sphb->iospace, OBJECT(sphb),
                       namebuf, SPAPR_PCI_IO_WIN_SIZE);

    sprintf(namebuf, "%s.io-alias", sphb->dtbusname);
    memory_region_init_alias(&sphb->iowindow, OBJECT(sphb), namebuf,
                             &sphb->iospace, 0, SPAPR_PCI_IO_WIN_SIZE);
    memory_region_add_subregion(get_system_memory(), sphb->io_win_addr,
                                &sphb->iowindow);

    bus = pci_register_bus(dev, NULL,
                           pci_spapr_set_irq, pci_spapr_map_irq, sphb,
                           &sphb->memspace, &sphb->iospace,
                           PCI_DEVFN(0, 0), PCI_NUM_PINS, TYPE_PCI_BUS);
    phb->bus = bus;

    /*
     * Initialize PHB address space.
     * By default there will be at least one subregion for default
     * 32bit DMA window.
     * Later the guest might want to create another DMA window
     * which will become another memory subregion.
     */
    sprintf(namebuf, "%s.iommu-root", sphb->dtbusname);

    memory_region_init(&sphb->iommu_root, OBJECT(sphb),
                       namebuf, UINT64_MAX);
    address_space_init(&sphb->iommu_as, &sphb->iommu_root,
                       sphb->dtbusname);

    /*
     * 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().
     * As MSIMessage:addr is going to be the same and MSIMessage:data
     * is going to be a VIRQ number, 4 bytes of the MSI MR will only
     * be used.
     *
     * For KVM we want to ensure that this memory is a full page so that
     * our memory slot is of page size granularity.
     */
#ifdef CONFIG_KVM
    if (kvm_enabled()) {
        msi_window_size = getpagesize();
    }
#endif

    memory_region_init_io(&sphb->msiwindow, NULL, &spapr_msi_ops, spapr,
                          "msi", msi_window_size);
    memory_region_add_subregion(&sphb->iommu_root, SPAPR_PCI_MSI_WINDOW,
                                &sphb->msiwindow);

    pci_setup_iommu(bus, spapr_pci_dma_iommu, sphb);

    pci_bus_set_route_irq_fn(bus, spapr_route_intx_pin_to_irq);

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

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

        irq = xics_alloc_block(spapr->icp, 0, 1, true, false);
        if (!irq) {
            error_setg(errp, "spapr_allocate_lsi failed");
            return;
        }

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

    if (!info->finish_realize) {
        error_setg(errp, "finish_realize not defined");
        return;
    }

    info->finish_realize(sphb, errp);

    sphb->msi = g_hash_table_new_full(g_int_hash, g_int_equal, g_free, g_free);
}

static void spapr_phb_finish_realize(sPAPRPHBState *sphb, Error **errp)
{
    sPAPRTCETable *tcet;

    tcet = spapr_tce_new_table(DEVICE(sphb), sphb->dma_liobn,
                               0,
                               SPAPR_TCE_PAGE_SHIFT,
                               0x40000000 >> SPAPR_TCE_PAGE_SHIFT, false);
    if (!tcet) {
        error_setg(errp, "Unable to create TCE table for %s",
                   sphb->dtbusname);
        return ;
    }

    /* Register default 32bit DMA window */
    memory_region_add_subregion(&sphb->iommu_root, 0,
                                spapr_tce_get_iommu(tcet));
}

static int spapr_phb_children_reset(Object *child, void *opaque)
{
    DeviceState *dev = (DeviceState *) object_dynamic_cast(child, TYPE_DEVICE);

    if (dev) {
        device_reset(dev);
    }

    return 0;
}

static void spapr_phb_reset(DeviceState *qdev)
{
    /* Reset the IOMMU state */
    object_child_foreach(OBJECT(qdev), spapr_phb_children_reset, NULL);
}

static Property spapr_phb_properties[] = {
    DEFINE_PROP_UINT32("index", sPAPRPHBState, index, -1),
    DEFINE_PROP_UINT64("buid", sPAPRPHBState, buid, -1),
    DEFINE_PROP_UINT32("liobn", sPAPRPHBState, dma_liobn, -1),
    DEFINE_PROP_UINT64("mem_win_addr", sPAPRPHBState, mem_win_addr, -1),
    DEFINE_PROP_UINT64("mem_win_size", sPAPRPHBState, mem_win_size,
                       SPAPR_PCI_MMIO_WIN_SIZE),
    DEFINE_PROP_UINT64("io_win_addr", sPAPRPHBState, io_win_addr, -1),
    DEFINE_PROP_UINT64("io_win_size", sPAPRPHBState, io_win_size,
                       SPAPR_PCI_IO_WIN_SIZE),
    DEFINE_PROP_END_OF_LIST(),
};

static const VMStateDescription vmstate_spapr_pci_lsi = {
    .name = "spapr_pci/lsi",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32_EQUAL(irq, struct spapr_pci_lsi),

        VMSTATE_END_OF_LIST()
    },
};

static const VMStateDescription vmstate_spapr_pci_msi = {
    .name = "spapr_pci/msi",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField []) {
        VMSTATE_UINT32(key, spapr_pci_msi_mig),
        VMSTATE_UINT32(value.first_irq, spapr_pci_msi_mig),
        VMSTATE_UINT32(value.num, spapr_pci_msi_mig),
        VMSTATE_END_OF_LIST()
    },
};

static void spapr_pci_fill_msi_devs(gpointer key, gpointer value,
                                    gpointer opaque)
{
    sPAPRPHBState *sphb = opaque;

    sphb->msi_devs[sphb->msi_devs_num].key = *(uint32_t *)key;
    sphb->msi_devs[sphb->msi_devs_num].value = *(spapr_pci_msi *)value;
    sphb->msi_devs_num++;
}

static void spapr_pci_pre_save(void *opaque)
{
    sPAPRPHBState *sphb = opaque;
    int msi_devs_num;

    if (sphb->msi_devs) {
        g_free(sphb->msi_devs);
        sphb->msi_devs = NULL;
    }
    sphb->msi_devs_num = 0;
    msi_devs_num = g_hash_table_size(sphb->msi);
    if (!msi_devs_num) {
        return;
    }
    sphb->msi_devs = g_malloc(msi_devs_num * sizeof(spapr_pci_msi_mig));

    g_hash_table_foreach(sphb->msi, spapr_pci_fill_msi_devs, sphb);
    assert(sphb->msi_devs_num == msi_devs_num);
}

static int spapr_pci_post_load(void *opaque, int version_id)
{
    sPAPRPHBState *sphb = opaque;
    gpointer key, value;
    int i;

    for (i = 0; i < sphb->msi_devs_num; ++i) {
        key = g_memdup(&sphb->msi_devs[i].key,
                       sizeof(sphb->msi_devs[i].key));
        value = g_memdup(&sphb->msi_devs[i].value,
                         sizeof(sphb->msi_devs[i].value));
        g_hash_table_insert(sphb->msi, key, value);
    }
    if (sphb->msi_devs) {
        g_free(sphb->msi_devs);
        sphb->msi_devs = NULL;
    }
    sphb->msi_devs_num = 0;

    return 0;
}

static const VMStateDescription vmstate_spapr_pci = {
    .name = "spapr_pci",
    .version_id = 2,
    .minimum_version_id = 2,
    .pre_save = spapr_pci_pre_save,
    .post_load = spapr_pci_post_load,
    .fields = (VMStateField[]) {
        VMSTATE_UINT64_EQUAL(buid, sPAPRPHBState),
        VMSTATE_UINT32_EQUAL(dma_liobn, sPAPRPHBState),
        VMSTATE_UINT64_EQUAL(mem_win_addr, sPAPRPHBState),
        VMSTATE_UINT64_EQUAL(mem_win_size, sPAPRPHBState),
        VMSTATE_UINT64_EQUAL(io_win_addr, sPAPRPHBState),
        VMSTATE_UINT64_EQUAL(io_win_size, sPAPRPHBState),
        VMSTATE_STRUCT_ARRAY(lsi_table, sPAPRPHBState, PCI_NUM_PINS, 0,
                             vmstate_spapr_pci_lsi, struct spapr_pci_lsi),
        VMSTATE_INT32(msi_devs_num, sPAPRPHBState),
        VMSTATE_STRUCT_VARRAY_ALLOC(msi_devs, sPAPRPHBState, msi_devs_num, 0,
                                    vmstate_spapr_pci_msi, spapr_pci_msi_mig),
        VMSTATE_END_OF_LIST()
    },
};

static const char *spapr_phb_root_bus_path(PCIHostState *host_bridge,
                                           PCIBus *rootbus)
{
    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(host_bridge);

    return sphb->dtbusname;
}

static void spapr_phb_class_init(ObjectClass *klass, void *data)
{
    PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
    DeviceClass *dc = DEVICE_CLASS(klass);
    sPAPRPHBClass *spc = SPAPR_PCI_HOST_BRIDGE_CLASS(klass);

    hc->root_bus_path = spapr_phb_root_bus_path;
    dc->realize = spapr_phb_realize;
    dc->props = spapr_phb_properties;
    dc->reset = spapr_phb_reset;
    dc->vmsd = &vmstate_spapr_pci;
    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
    dc->cannot_instantiate_with_device_add_yet = false;
    spc->finish_realize = spapr_phb_finish_realize;
}

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,
    .class_size    = sizeof(sPAPRPHBClass),
};

PCIHostState *spapr_create_phb(sPAPREnvironment *spapr, int index)
{
    DeviceState *dev;

    dev = qdev_create(NULL, TYPE_SPAPR_PCI_HOST_BRIDGE);
    qdev_prop_set_uint32(dev, "index", index);
    qdev_init_nofail(dev);

    return PCI_HOST_BRIDGE(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 */

typedef struct sPAPRTCEDT {
    void *fdt;
    int node_off;
} sPAPRTCEDT;

static int spapr_phb_children_dt(Object *child, void *opaque)
{
    sPAPRTCEDT *p = opaque;
    sPAPRTCETable *tcet;

    tcet = (sPAPRTCETable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE);
    if (!tcet) {
        return 0;
    }

    spapr_dma_dt(p->fdt, p->node_off, "ibm,dma-window",
                 tcet->liobn, tcet->bus_offset,
                 tcet->nb_table << tcet->page_shift);
    /* Stop after the first window */

    return 1;
}

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) };
    const uint64_t mmiosize = memory_region_size(&phb->memwindow);
    const uint64_t w32max = (1ULL << 32) - SPAPR_PCI_MEM_WIN_BUS_OFFSET;
    const uint64_t w32size = MIN(w32max, mmiosize);
    const uint64_t w64size = (mmiosize > w32size) ? (mmiosize - w32size) : 0;
    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(w32size),
        },
        {
            cpu_to_be32(b_ss(3)), cpu_to_be64(1ULL << 32),
            cpu_to_be64(phb->mem_win_addr + w32size),
            cpu_to_be64(w64size)
        },
    };
    const unsigned sizeof_ranges = (w64size ? 3 : 2) * sizeof(ranges[0]);
    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));
    _FDT(fdt_setprop_cell(fdt, bus_off, "ibm,pe-total-#msi", XICS_IRQS));

    /* 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)));

    object_child_foreach(OBJECT(phb), spapr_phb_children_dt,
                         &((sPAPRTCEDT){ .fdt = fdt, .node_off = bus_off }));

    return 0;
}

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

    spapr_rtas_register(RTAS_IBM_SET_EEH_OPTION,
                        "ibm,set-eeh-option",
                        rtas_ibm_set_eeh_option);
    spapr_rtas_register(RTAS_IBM_GET_CONFIG_ADDR_INFO2,
                        "ibm,get-config-addr-info2",
                        rtas_ibm_get_config_addr_info2);
    spapr_rtas_register(RTAS_IBM_READ_SLOT_RESET_STATE2,
                        "ibm,read-slot-reset-state2",
                        rtas_ibm_read_slot_reset_state2);
    spapr_rtas_register(RTAS_IBM_SET_SLOT_RESET,
                        "ibm,set-slot-reset",
                        rtas_ibm_set_slot_reset);
    spapr_rtas_register(RTAS_IBM_CONFIGURE_PE,
                        "ibm,configure-pe",
                        rtas_ibm_configure_pe);
    spapr_rtas_register(RTAS_IBM_SLOT_ERROR_DETAIL,
                        "ibm,slot-error-detail",
                        rtas_ibm_slot_error_detail);
}

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

type_init(spapr_pci_register_types)

static int spapr_switch_one_vga(DeviceState *dev, void *opaque)
{
    bool be = *(bool *)opaque;

    if (object_dynamic_cast(OBJECT(dev), "VGA")
        || object_dynamic_cast(OBJECT(dev), "secondary-vga")) {
        object_property_set_bool(OBJECT(dev), be, "big-endian-framebuffer",
                                 &error_abort);
    }
    return 0;
}

void spapr_pci_switch_vga(bool big_endian)
{
    sPAPRPHBState *sphb;

    /*
     * For backward compatibility with existing guests, we switch
     * the endianness of the VGA controller when changing the guest
     * interrupt mode
     */
    QLIST_FOREACH(sphb, &spapr->phbs, list) {
        BusState *bus = &PCI_HOST_BRIDGE(sphb)->bus->qbus;
        qbus_walk_children(bus, spapr_switch_one_vga, NULL, NULL, NULL,
                           &big_endian);
    }
}
