/*
 * QEMU Management Protocol commands
 *
 * Copyright IBM, Corp. 2011
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#include "qemu/osdep.h"
#include "monitor/monitor.h"
#include "monitor/qmp-helpers.h"
#include "sysemu/sysemu.h"
#include "chardev/char.h"
#include "sysemu/kvm.h"
#include "sysemu/runstate.h"
#include "sysemu/runstate-action.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-acpi.h"
#include "qapi/qapi-commands-control.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qapi-commands-misc.h"
#include "qapi/qapi-commands-stats.h"
#include "qapi/type-helpers.h"
#include "hw/mem/memory-device.h"
#include "hw/acpi/acpi_dev_interface.h"
#include "hw/intc/intc.h"
#include "hw/rdma/rdma.h"
#include "monitor/stats.h"

NameInfo *qmp_query_name(Error **errp)
{
    NameInfo *info = g_malloc0(sizeof(*info));

    info->name = g_strdup(qemu_name);
    return info;
}

KvmInfo *qmp_query_kvm(Error **errp)
{
    KvmInfo *info = g_malloc0(sizeof(*info));

    info->enabled = kvm_enabled();
    info->present = accel_find("kvm");

    return info;
}

UuidInfo *qmp_query_uuid(Error **errp)
{
    UuidInfo *info = g_malloc0(sizeof(*info));

    info->UUID = qemu_uuid_unparse_strdup(&qemu_uuid);
    return info;
}

void qmp_quit(Error **errp)
{
    shutdown_action = SHUTDOWN_ACTION_POWEROFF;
    qemu_system_shutdown_request(SHUTDOWN_CAUSE_HOST_QMP_QUIT);
}

void qmp_stop(Error **errp)
{
    /* if there is a dump in background, we should wait until the dump
     * finished */
    if (qemu_system_dump_in_progress()) {
        error_setg(errp, "There is a dump in process, please wait.");
        return;
    }

    if (runstate_check(RUN_STATE_INMIGRATE)) {
        autostart = 0;
    } else {
        vm_stop(RUN_STATE_PAUSED);
    }
}

void qmp_system_reset(Error **errp)
{
    qemu_system_reset_request(SHUTDOWN_CAUSE_HOST_QMP_SYSTEM_RESET);
}

void qmp_system_powerdown(Error **errp)
{
    qemu_system_powerdown_request();
}

void qmp_cont(Error **errp)
{
    BlockBackend *blk;
    BlockJob *job;
    Error *local_err = NULL;

    /* if there is a dump in background, we should wait until the dump
     * finished */
    if (qemu_system_dump_in_progress()) {
        error_setg(errp, "There is a dump in process, please wait.");
        return;
    }

    if (runstate_needs_reset()) {
        error_setg(errp, "Resetting the Virtual Machine is required");
        return;
    } else if (runstate_check(RUN_STATE_SUSPENDED)) {
        return;
    } else if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
        error_setg(errp, "Migration is not finalized yet");
        return;
    }

    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        blk_iostatus_reset(blk);
    }

    WITH_JOB_LOCK_GUARD() {
        for (job = block_job_next_locked(NULL); job;
             job = block_job_next_locked(job)) {
            block_job_iostatus_reset_locked(job);
        }
    }

    /* Continuing after completed migration. Images have been inactivated to
     * allow the destination to take control. Need to get control back now.
     *
     * If there are no inactive block nodes (e.g. because the VM was just
     * paused rather than completing a migration), bdrv_inactivate_all() simply
     * doesn't do anything. */
    bdrv_activate_all(&local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

    if (runstate_check(RUN_STATE_INMIGRATE)) {
        autostart = 1;
    } else {
        vm_start();
    }
}

void qmp_system_wakeup(Error **errp)
{
    if (!qemu_wakeup_suspend_enabled()) {
        error_setg(errp,
                   "wake-up from suspend is not supported by this guest");
        return;
    }

    qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, errp);
}

void qmp_add_client(const char *protocol, const char *fdname,
                    bool has_skipauth, bool skipauth, bool has_tls, bool tls,
                    Error **errp)
{
    static const struct {
        const char *name;
        bool (*add_client)(int fd, bool has_skipauth, bool skipauth,
                           bool has_tls, bool tls, Error **errp);
    } protocol_table[] = {
        { "spice", qmp_add_client_spice },
#ifdef CONFIG_VNC
        { "vnc", qmp_add_client_vnc },
#endif
#ifdef CONFIG_DBUS_DISPLAY
        { "@dbus-display", qmp_add_client_dbus_display },
#endif
    };
    Chardev *s;
    int fd, i;

    fd = monitor_get_fd(monitor_cur(), fdname, errp);
    if (fd < 0) {
        return;
    }

    for (i = 0; i < ARRAY_SIZE(protocol_table); i++) {
        if (!strcmp(protocol, protocol_table[i].name)) {
            if (!protocol_table[i].add_client(fd, has_skipauth, skipauth,
                                              has_tls, tls, errp)) {
                close(fd);
            }
            return;
        }
    }

    s = qemu_chr_find(protocol);
    if (!s) {
        error_setg(errp, "protocol '%s' is invalid", protocol);
        close(fd);
        return;
    }
    if (qemu_chr_add_client(s, fd) < 0) {
        error_setg(errp, "failed to add client");
        close(fd);
        return;
    }
}

MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
{
    return qmp_memory_device_list();
}

ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
{
    bool ambig;
    ACPIOSTInfoList *head = NULL;
    ACPIOSTInfoList **prev = &head;
    Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, &ambig);

    if (obj) {
        AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
        AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);

        adevc->ospm_status(adev, &prev);
    } else {
        error_setg(errp, "command is not supported, missing ACPI device");
    }

    return head;
}

MemoryInfo *qmp_query_memory_size_summary(Error **errp)
{
    MemoryInfo *mem_info = g_new0(MemoryInfo, 1);
    MachineState *ms = MACHINE(qdev_get_machine());

    mem_info->base_memory = ms->ram_size;

    mem_info->plugged_memory = get_plugged_memory_size();
    mem_info->has_plugged_memory =
        mem_info->plugged_memory != (uint64_t)-1;

    return mem_info;
}

static int qmp_x_query_rdma_foreach(Object *obj, void *opaque)
{
    RdmaProvider *rdma;
    RdmaProviderClass *k;
    GString *buf = opaque;

    if (object_dynamic_cast(obj, INTERFACE_RDMA_PROVIDER)) {
        rdma = RDMA_PROVIDER(obj);
        k = RDMA_PROVIDER_GET_CLASS(obj);
        if (k->format_statistics) {
            k->format_statistics(rdma, buf);
        } else {
            g_string_append_printf(buf,
                                   "RDMA statistics not available for %s.\n",
                                   object_get_typename(obj));
        }
    }

    return 0;
}

HumanReadableText *qmp_x_query_rdma(Error **errp)
{
    g_autoptr(GString) buf = g_string_new("");

    object_child_foreach_recursive(object_get_root(),
                                   qmp_x_query_rdma_foreach, buf);

    return human_readable_text_from_str(buf);
}

HumanReadableText *qmp_x_query_ramblock(Error **errp)
{
    g_autoptr(GString) buf = ram_block_format();

    return human_readable_text_from_str(buf);
}

static int qmp_x_query_irq_foreach(Object *obj, void *opaque)
{
    InterruptStatsProvider *intc;
    InterruptStatsProviderClass *k;
    GString *buf = opaque;

    if (object_dynamic_cast(obj, TYPE_INTERRUPT_STATS_PROVIDER)) {
        intc = INTERRUPT_STATS_PROVIDER(obj);
        k = INTERRUPT_STATS_PROVIDER_GET_CLASS(obj);
        uint64_t *irq_counts;
        unsigned int nb_irqs, i;
        if (k->get_statistics &&
            k->get_statistics(intc, &irq_counts, &nb_irqs)) {
            if (nb_irqs > 0) {
                g_string_append_printf(buf, "IRQ statistics for %s:\n",
                                       object_get_typename(obj));
                for (i = 0; i < nb_irqs; i++) {
                    if (irq_counts[i] > 0) {
                        g_string_append_printf(buf, "%2d: %" PRId64 "\n", i,
                                               irq_counts[i]);
                    }
                }
            }
        } else {
            g_string_append_printf(buf,
                                   "IRQ statistics not available for %s.\n",
                                   object_get_typename(obj));
        }
    }

    return 0;
}

HumanReadableText *qmp_x_query_irq(Error **errp)
{
    g_autoptr(GString) buf = g_string_new("");

    object_child_foreach_recursive(object_get_root(),
                                   qmp_x_query_irq_foreach, buf);

    return human_readable_text_from_str(buf);
}

typedef struct StatsCallbacks {
    StatsProvider provider;
    StatRetrieveFunc *stats_cb;
    SchemaRetrieveFunc *schemas_cb;
    QTAILQ_ENTRY(StatsCallbacks) next;
} StatsCallbacks;

static QTAILQ_HEAD(, StatsCallbacks) stats_callbacks =
    QTAILQ_HEAD_INITIALIZER(stats_callbacks);

void add_stats_callbacks(StatsProvider provider,
                         StatRetrieveFunc *stats_fn,
                         SchemaRetrieveFunc *schemas_fn)
{
    StatsCallbacks *entry = g_new(StatsCallbacks, 1);
    entry->provider = provider;
    entry->stats_cb = stats_fn;
    entry->schemas_cb = schemas_fn;

    QTAILQ_INSERT_TAIL(&stats_callbacks, entry, next);
}

static bool invoke_stats_cb(StatsCallbacks *entry,
                            StatsResultList **stats_results,
                            StatsFilter *filter, StatsRequest *request,
                            Error **errp)
{
    ERRP_GUARD();
    strList *targets = NULL;
    strList *names = NULL;

    if (request) {
        if (request->provider != entry->provider) {
            return true;
        }
        if (request->has_names && !request->names) {
            return true;
        }
        names = request->has_names ? request->names : NULL;
    }

    switch (filter->target) {
    case STATS_TARGET_VM:
        break;
    case STATS_TARGET_VCPU:
        if (filter->u.vcpu.has_vcpus) {
            if (!filter->u.vcpu.vcpus) {
                /* No targets allowed?  Return no statistics.  */
                return true;
            }
            targets = filter->u.vcpu.vcpus;
        }
        break;
    default:
        abort();
    }

    entry->stats_cb(stats_results, filter->target, names, targets, errp);
    if (*errp) {
        qapi_free_StatsResultList(*stats_results);
        *stats_results = NULL;
        return false;
    }
    return true;
}

StatsResultList *qmp_query_stats(StatsFilter *filter, Error **errp)
{
    StatsResultList *stats_results = NULL;
    StatsCallbacks *entry;
    StatsRequestList *request;

    QTAILQ_FOREACH(entry, &stats_callbacks, next) {
        if (filter->has_providers) {
            for (request = filter->providers; request; request = request->next) {
                if (!invoke_stats_cb(entry, &stats_results, filter,
                                     request->value, errp)) {
                    break;
                }
            }
        } else {
            if (!invoke_stats_cb(entry, &stats_results, filter, NULL, errp)) {
                break;
            }
        }
    }

    return stats_results;
}

StatsSchemaList *qmp_query_stats_schemas(bool has_provider,
                                         StatsProvider provider,
                                         Error **errp)
{
    ERRP_GUARD();
    StatsSchemaList *stats_results = NULL;
    StatsCallbacks *entry;

    QTAILQ_FOREACH(entry, &stats_callbacks, next) {
        if (!has_provider || provider == entry->provider) {
            entry->schemas_cb(&stats_results, errp);
            if (*errp) {
                qapi_free_StatsSchemaList(stats_results);
                return NULL;
            }
        }
    }

    return stats_results;
}

void add_stats_entry(StatsResultList **stats_results, StatsProvider provider,
                     const char *qom_path, StatsList *stats_list)
{
    StatsResult *entry = g_new0(StatsResult, 1);

    entry->provider = provider;
    entry->qom_path = g_strdup(qom_path);
    entry->stats = stats_list;

    QAPI_LIST_PREPEND(*stats_results, entry);
}

void add_stats_schema(StatsSchemaList **schema_results,
                      StatsProvider provider, StatsTarget target,
                      StatsSchemaValueList *stats_list)
{
    StatsSchema *entry = g_new0(StatsSchema, 1);

    entry->provider = provider;
    entry->target = target;
    entry->stats = stats_list;
    QAPI_LIST_PREPEND(*schema_results, entry);
}

bool apply_str_list_filter(const char *string, strList *list)
{
    strList *str_list = NULL;

    if (!list) {
        return true;
    }
    for (str_list = list; str_list; str_list = str_list->next) {
        if (g_str_equal(string, str_list->value)) {
            return true;
        }
    }
    return false;
}