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/*

 * QEMU sPAPR VIO code

 *

 * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>

 * Based on the s390 virtio bus code:

 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "hw/hw.h"

#include "sysemu/sysemu.h"

#include "hw/boards.h"

#include "monitor/monitor.h"

#include "hw/loader.h"

#include "elf.h"

#include "hw/sysbus.h"

#include "sysemu/kvm.h"

#include "sysemu/device_tree.h"

#include "kvm_ppc.h"

#include "hw/ppc/spapr.h"

#include "hw/ppc/spapr_vio.h"

#include "hw/ppc/xics.h"

#ifdef CONFIG_FDT

#include <libfdt.h>

#endif /* CONFIG_FDT */

/* #define DEBUG_SPAPR */

#ifdef DEBUG_SPAPR

#define dprintf(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define dprintf(fmt, ...) \

    do { } while (0)

#endif

static Property spapr_vio_props[] = {

    DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \

    DEFINE_PROP_END_OF_LIST(),

};

static const TypeInfo spapr_vio_bus_info = {

    .name = TYPE_SPAPR_VIO_BUS,

    .parent = TYPE_BUS,

    .instance_size = sizeof(VIOsPAPRBus),

};

VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)

{

    BusChild *kid;

    VIOsPAPRDevice *dev = NULL;

    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {

        dev = (VIOsPAPRDevice *)kid->child;

        if (dev->reg == reg) {

            return dev;

        }

    }

    return NULL;

}

static char *vio_format_dev_name(VIOsPAPRDevice *dev)

{

    VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);

    char *name;

    /* Device tree style name device@reg */

    name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg);

    return name;

}

#ifdef CONFIG_FDT

static int vio_make_devnode(VIOsPAPRDevice *dev,

                            void *fdt)

{

    VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);

    int vdevice_off, node_off, ret;

    char *dt_name;

    vdevice_off = fdt_path_offset(fdt, "/vdevice");

    if (vdevice_off < 0) {

        return vdevice_off;

    }

    dt_name = vio_format_dev_name(dev);

    node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);

    g_free(dt_name);

    if (node_off < 0) {

        return node_off;

    }

    ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);

    if (ret < 0) {

        return ret;

    }

    if (pc->dt_type) {

        ret = fdt_setprop_string(fdt, node_off, "device_type",

                                 pc->dt_type);

        if (ret < 0) {

            return ret;

        }

    }

    if (pc->dt_compatible) {

        ret = fdt_setprop_string(fdt, node_off, "compatible",

                                 pc->dt_compatible);

        if (ret < 0) {

            return ret;

        }

    }

    if (dev->irq) {

        uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0};

        ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,

                          sizeof(ints_prop));

        if (ret < 0) {

            return ret;

        }

    }

    ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->dma);

    if (ret < 0) {

        return ret;

    }

    if (pc->devnode) {

        ret = (pc->devnode)(dev, fdt, node_off);

        if (ret < 0) {

            return ret;

        }

    }

    return node_off;

}

#endif /* CONFIG_FDT */

/*

 * CRQ handling

 */

static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                              target_ulong opcode, target_ulong *args)

{

    target_ulong reg = args[0];

    target_ulong queue_addr = args[1];

    target_ulong queue_len = args[2];

    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    if (!dev) {

        hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);

        return H_PARAMETER;

    }

    /* We can't grok a queue size bigger than 256M for now */

    if (queue_len < 0x1000 || queue_len > 0x10000000) {

        hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx

                      ")\n", queue_len);

        return H_PARAMETER;

    }

    /* Check queue alignment */

    if (queue_addr & 0xfff) {

        hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);

        return H_PARAMETER;

    }

    /* Check if device supports CRQs */

    if (!dev->crq.SendFunc) {

        hcall_dprintf("Device does not support CRQ\n");

        return H_NOT_FOUND;

    }

    /* Already a queue ? */

    if (dev->crq.qsize) {

        hcall_dprintf("CRQ already registered\n");

        return H_RESOURCE;

    }

    dev->crq.qladdr = queue_addr;

    dev->crq.qsize = queue_len;

    dev->crq.qnext = 0;

    dprintf("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x"

            TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n",

            reg, queue_addr, queue_len);

    return H_SUCCESS;

}

static target_ulong free_crq(VIOsPAPRDevice *dev)

{

    dev->crq.qladdr = 0;

    dev->crq.qsize = 0;

    dev->crq.qnext = 0;

    dprintf("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg);

    return H_SUCCESS;

}

static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                               target_ulong opcode, target_ulong *args)

{

    target_ulong reg = args[0];

    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    if (!dev) {

        hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);

        return H_PARAMETER;

    }

    return free_crq(dev);

}

static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                               target_ulong opcode, target_ulong *args)

{

    target_ulong reg = args[0];

    target_ulong msg_hi = args[1];

    target_ulong msg_lo = args[2];

    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    uint64_t crq_mangle[2];

    if (!dev) {

        hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);

        return H_PARAMETER;

    }

    crq_mangle[0] = cpu_to_be64(msg_hi);

    crq_mangle[1] = cpu_to_be64(msg_lo);

    if (dev->crq.SendFunc) {

        return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);

    }

    return H_HARDWARE;

}

static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                 target_ulong opcode, target_ulong *args)

{

    target_ulong reg = args[0];

    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    if (!dev) {

        hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);

        return H_PARAMETER;

    }

    return 0;

}

/* Returns negative error, 0 success, or positive: queue full */

int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq)

{

    int rc;

    uint8_t byte;

    if (!dev->crq.qsize) {

        fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n");

        return -1;

    }

    /* Maybe do a fast path for KVM just writing to the pages */

    rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);

    if (rc) {

        return rc;

    }

    if (byte != 0) {

        return 1;

    }

    rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,

                             &crq[8], 8);

    if (rc) {

        return rc;

    }

    kvmppc_eieio();

    rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);

    if (rc) {

        return rc;

    }

    dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;

    if (dev->signal_state & 1) {

        qemu_irq_pulse(spapr_vio_qirq(dev));

    }

    return 0;

}

/* "quiesce" handling */

static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)

{

    if (dev->dma) {

        spapr_tce_reset(dev->dma);

    }

    free_crq(dev);

}

static void rtas_set_tce_bypass(sPAPREnvironment *spapr, uint32_t token,

                                uint32_t nargs, target_ulong args,

                                uint32_t nret, target_ulong rets)

{

    VIOsPAPRBus *bus = spapr->vio_bus;

    VIOsPAPRDevice *dev;

    uint32_t unit, enable;

    if (nargs != 2) {

        rtas_st(rets, 0, -3);

        return;

    }

    unit = rtas_ld(args, 0);

    enable = rtas_ld(args, 1);

    dev = spapr_vio_find_by_reg(bus, unit);

    if (!dev) {

        rtas_st(rets, 0, -3);

        return;

    }

    if (!dev->dma) {

        rtas_st(rets, 0, -3);

        return;

    }

    spapr_tce_set_bypass(dev->dma, !!enable);

    rtas_st(rets, 0, 0);

}

static void rtas_quiesce(sPAPREnvironment *spapr, uint32_t token,

                         uint32_t nargs, target_ulong args,

                         uint32_t nret, target_ulong rets)

{

    VIOsPAPRBus *bus = spapr->vio_bus;

    BusChild *kid;

    VIOsPAPRDevice *dev = NULL;

    if (nargs != 0) {

        rtas_st(rets, 0, -3);

        return;

    }

    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {

        dev = (VIOsPAPRDevice *)kid->child;

        spapr_vio_quiesce_one(dev);

    }

    rtas_st(rets, 0, 0);

}

static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev)

{

    VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus);

    BusChild *kid;

    VIOsPAPRDevice *other;

    /*

     * Check for a device other than the given one which is already

     * using the requested address. We have to open code this because

     * the given dev might already be in the list.

     */

    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {

        other = DO_UPCAST(VIOsPAPRDevice, qdev, kid->child);

        if (other != dev && other->reg == dev->reg) {

            return other;

        }

    }

    return 0;

}

static void spapr_vio_busdev_reset(DeviceState *qdev)

{

    VIOsPAPRDevice *dev = DO_UPCAST(VIOsPAPRDevice, qdev, qdev);

    VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);

    /* Shut down the request queue and TCEs if necessary */

    spapr_vio_quiesce_one(dev);

    dev->signal_state = 0;

    if (pc->reset) {

        pc->reset(dev);

    }

}

static int spapr_vio_busdev_init(DeviceState *qdev)

{

    VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;

    VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);

    char *id;

    if (dev->reg != -1) {

        /*

         * Explicitly assigned address, just verify that no-one else

         * is using it.  other mechanism). We have to open code this

         * rather than using spapr_vio_find_by_reg() because sdev

         * itself is already in the list.

         */

        VIOsPAPRDevice *other = reg_conflict(dev);

        if (other) {

            fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n",

                    object_get_typename(OBJECT(qdev)),

                    object_get_typename(OBJECT(&other->qdev)),

                    dev->reg);

            return -1;

        }

    } else {

        /* Need to assign an address */

        VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, bus, dev->qdev.parent_bus);

        do {

            dev->reg = bus->next_reg++;

        } while (reg_conflict(dev));

    }

    /* Don't overwrite ids assigned on the command line */

    if (!dev->qdev.id) {

        id = vio_format_dev_name(dev);

        dev->qdev.id = id;

    }

    dev->irq = spapr_allocate_msi(dev->irq);

    if (!dev->irq) {

        return -1;

    }

    if (pc->rtce_window_size) {

        uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg;

        dev->dma = spapr_tce_new_dma_context(liobn, pc->rtce_window_size);

    }

    return pc->init(dev);

}

static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                 target_ulong opcode,

                                 target_ulong *args)

{

    target_ulong reg = args[0];

    target_ulong mode = args[1];

    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    VIOsPAPRDeviceClass *pc;

    if (!dev) {

        return H_PARAMETER;

    }

    pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);

    if (mode & ~pc->signal_mask) {

        return H_PARAMETER;

    }

    dev->signal_state = mode;

    return H_SUCCESS;

}

VIOsPAPRBus *spapr_vio_bus_init(void)

{

    VIOsPAPRBus *bus;

    BusState *qbus;

    DeviceState *dev;

    /* Create bridge device */

    dev = qdev_create(NULL, "spapr-vio-bridge");

    qdev_init_nofail(dev);

    /* Create bus on bridge device */

    qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");

    bus = DO_UPCAST(VIOsPAPRBus, bus, qbus);

    bus->next_reg = 0x71000000;

    /* hcall-vio */

    spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);

    /* hcall-crq */

    spapr_register_hypercall(H_REG_CRQ, h_reg_crq);

    spapr_register_hypercall(H_FREE_CRQ, h_free_crq);

    spapr_register_hypercall(H_SEND_CRQ, h_send_crq);

    spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);

    /* RTAS calls */

    spapr_rtas_register("ibm,set-tce-bypass", rtas_set_tce_bypass);

    spapr_rtas_register("quiesce", rtas_quiesce);

    return bus;

}

/* Represents sPAPR hcall VIO devices */

static int spapr_vio_bridge_init(SysBusDevice *dev)

{

    /* nothing */

    return 0;

}

static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = spapr_vio_bridge_init;

    dc->no_user = 1;

}

static const TypeInfo spapr_vio_bridge_info = {

    .name          = "spapr-vio-bridge",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(SysBusDevice),

    .class_init    = spapr_vio_bridge_class_init,

};

static void vio_spapr_device_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *k = DEVICE_CLASS(klass);

    k->init = spapr_vio_busdev_init;

    k->reset = spapr_vio_busdev_reset;

    k->bus_type = TYPE_SPAPR_VIO_BUS;

    k->props = spapr_vio_props;

}

static const TypeInfo spapr_vio_type_info = {

    .name = TYPE_VIO_SPAPR_DEVICE,

    .parent = TYPE_DEVICE,

    .instance_size = sizeof(VIOsPAPRDevice),

    .abstract = true,

    .class_size = sizeof(VIOsPAPRDeviceClass),

    .class_init = vio_spapr_device_class_init,

};

static void spapr_vio_register_types(void)

{

    type_register_static(&spapr_vio_bus_info);

    type_register_static(&spapr_vio_bridge_info);

    type_register_static(&spapr_vio_type_info);

}

type_init(spapr_vio_register_types)

#ifdef CONFIG_FDT

static int compare_reg(const void *p1, const void *p2)

{

    VIOsPAPRDevice const *dev1, *dev2;

    dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1;

    dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2;

    if (dev1->reg < dev2->reg) {

        return -1;

    }

    if (dev1->reg == dev2->reg) {

        return 0;

    }

    /* dev1->reg > dev2->reg */

    return 1;

}

int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)

{

    DeviceState *qdev, **qdevs;

    BusChild *kid;

    int i, num, ret = 0;

    /* Count qdevs on the bus list */

    num = 0;

    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {

        num++;

    }

    /* Copy out into an array of pointers */

    qdevs = g_malloc(sizeof(qdev) * num);

    num = 0;

    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {

        qdevs[num++] = kid->child;

    }

    /* Sort the array */

    qsort(qdevs, num, sizeof(qdev), compare_reg);

    /* Hack alert. Give the devices to libfdt in reverse order, we happen

     * to know that will mean they are in forward order in the tree. */

    for (i = num - 1; i >= 0; i--) {

        VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]);

        ret = vio_make_devnode(dev, fdt);

        if (ret < 0) {

            goto out;

        }

    }

    ret = 0;

out:

    free(qdevs);

    return ret;

}

int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus)

{

    VIOsPAPRDevice *dev;

    char *name, *path;

    int ret, offset;

    dev = spapr_vty_get_default(bus);

    if (!dev)

        return 0;

    offset = fdt_path_offset(fdt, "/chosen");

    if (offset < 0) {

        return offset;

    }

    name = vio_format_dev_name(dev);

    path = g_strdup_printf("/vdevice/%s", name);

    ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path);

    g_free(name);

    g_free(path);

    return ret;

}

#endif /* CONFIG_FDT */