#include <linux/module.h>

#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include "uncore.h"

static struct intel_uncore_type *empty_uncore[] = { NULL, };
struct intel_uncore_type **uncore_msr_uncores = empty_uncore;
struct intel_uncore_type **uncore_pci_uncores = empty_uncore;

static bool pcidrv_registered;
struct pci_driver *uncore_pci_driver;
/* pci bus to socket mapping */
DEFINE_RAW_SPINLOCK(pci2phy_map_lock);
struct list_head pci2phy_map_head = LIST_HEAD_INIT(pci2phy_map_head);
struct pci_extra_dev *uncore_extra_pci_dev;
static int max_packages;

/* mask of cpus that collect uncore events */
static cpumask_t uncore_cpu_mask;

/* constraint for the fixed counter */
static struct event_constraint uncore_constraint_fixed =
        EVENT_CONSTRAINT(~0ULL, 1 << UNCORE_PMC_IDX_FIXED, ~0ULL);
struct event_constraint uncore_constraint_empty =
        EVENT_CONSTRAINT(0, 0, 0);

MODULE_LICENSE("GPL");

static int uncore_pcibus_to_physid(struct pci_bus *bus)
{
        struct pci2phy_map *map;
        int phys_id = -1;

        raw_spin_lock(&pci2phy_map_lock);
        list_for_each_entry(map, &pci2phy_map_head, list) {
                if (map->segment == pci_domain_nr(bus)) {
                        phys_id = map->pbus_to_physid[bus->number];
                        break;
                }
        }
        raw_spin_unlock(&pci2phy_map_lock);

        return phys_id;
}

static void uncore_free_pcibus_map(void)
{
        struct pci2phy_map *map, *tmp;

        list_for_each_entry_safe(map, tmp, &pci2phy_map_head, list) {
                list_del(&map->list);
                kfree(map);
        }
}

struct pci2phy_map *__find_pci2phy_map(int segment)
{
        struct pci2phy_map *map, *alloc = NULL;
        int i;

        lockdep_assert_held(&pci2phy_map_lock);

lookup:
        list_for_each_entry(map, &pci2phy_map_head, list) {
                if (map->segment == segment)
                        goto end;
        }

        if (!alloc) {
                raw_spin_unlock(&pci2phy_map_lock);
                alloc = kmalloc(sizeof(struct pci2phy_map), GFP_KERNEL);
                raw_spin_lock(&pci2phy_map_lock);

                if (!alloc)
                        return NULL;

                goto lookup;
        }

        map = alloc;
        alloc = NULL;
        map->segment = segment;
        for (i = 0; i < 256; i++)
                map->pbus_to_physid[i] = -1;
        list_add_tail(&map->list, &pci2phy_map_head);

end:
        kfree(alloc);
        return map;
}

ssize_t uncore_event_show(struct kobject *kobj,
                          struct kobj_attribute *attr, char *buf)
{
        struct uncore_event_desc *event =
                container_of(attr, struct uncore_event_desc, attr);
        return sprintf(buf, "%s", event->config);
}

struct intel_uncore_box *uncore_pmu_to_box(struct intel_uncore_pmu *pmu, int cpu)
{
        return pmu->boxes[topology_logical_package_id(cpu)];
}

u64 uncore_msr_read_counter(struct intel_uncore_box *box, struct perf_event *event)
{
        u64 count;

        rdmsrl(event->hw.event_base, count);

        return count;
}

/*
 * generic get constraint function for shared match/mask registers.
 */
struct event_constraint *
uncore_get_constraint(struct intel_uncore_box *box, struct perf_event *event)
{
        struct intel_uncore_extra_reg *er;
        struct hw_perf_event_extra *reg1 = &event->hw.extra_reg;
        struct hw_perf_event_extra *reg2 = &event->hw.branch_reg;
        unsigned long flags;
        bool ok = false;

        /*
         * reg->alloc can be set due to existing state, so for fake box we
         * need to ignore this, otherwise we might fail to allocate proper
         * fake state for this extra reg constraint.
         */
        if (reg1->idx == EXTRA_REG_NONE ||
            (!uncore_box_is_fake(box) && reg1->alloc))
                return NULL;

        er = &box->shared_regs[reg1->idx];
        raw_spin_lock_irqsave(&er->lock, flags);
        if (!atomic_read(&er->ref) ||
            (er->config1 == reg1->config && er->config2 == reg2->config)) {
                atomic_inc(&er->ref);
                er->config1 = reg1->config;
                er->config2 = reg2->config;
                ok = true;
        }
        raw_spin_unlock_irqrestore(&er->lock, flags);

        if (ok) {
                if (!uncore_box_is_fake(box))
                        reg1->alloc = 1;
                return NULL;
        }

        return &uncore_constraint_empty;
}

void uncore_put_constraint(struct intel_uncore_box *box, struct perf_event *event)
{
        struct intel_uncore_extra_reg *er;
        struct hw_perf_event_extra *reg1 = &event->hw.extra_reg;

        /*
         * Only put constraint if extra reg was actually allocated. Also
         * takes care of event which do not use an extra shared reg.
         *
         * Also, if this is a fake box we shouldn't touch any event state
         * (reg->alloc) and we don't care about leaving inconsistent box
         * state either since it will be thrown out.
         */
        if (uncore_box_is_fake(box) || !reg1->alloc)
                return;

        er = &box->shared_regs[reg1->idx];
        atomic_dec(&er->ref);
        reg1->alloc = 0;
}

u64 uncore_shared_reg_config(struct intel_uncore_box *box, int idx)
{
        struct intel_uncore_extra_reg *er;
        unsigned long flags;
        u64 config;

        er = &box->shared_regs[idx];

        raw_spin_lock_irqsave(&er->lock, flags);
        config = er->config;
        raw_spin_unlock_irqrestore(&er->lock, flags);

        return config;
}

static void uncore_assign_hw_event(struct intel_uncore_box *box,
                                   struct perf_event *event, int idx)
{
        struct hw_perf_event *hwc = &event->hw;

        hwc->idx = idx;
        hwc->last_tag = ++box->tags[idx];

        if (hwc->idx == UNCORE_PMC_IDX_FIXED) {
                hwc->event_base = uncore_fixed_ctr(box);
                hwc->config_base = uncore_fixed_ctl(box);
                return;
        }

        hwc->config_base = uncore_event_ctl(box, hwc->idx);
        hwc->event_base  = uncore_perf_ctr(box, hwc->idx);
}

void uncore_perf_event_update(struct intel_uncore_box *box, struct perf_event *event)
{
        u64 prev_count, new_count, delta;
        int shift;

        if (event->hw.idx >= UNCORE_PMC_IDX_FIXED)
                shift = 64 - uncore_fixed_ctr_bits(box);
        else
                shift = 64 - uncore_perf_ctr_bits(box);

        /* the hrtimer might modify the previous event value */
again:
        prev_count = local64_read(&event->hw.prev_count);
        new_count = uncore_read_counter(box, event);
        if (local64_xchg(&event->hw.prev_count, new_count) != prev_count)
                goto again;

        delta = (new_count << shift) - (prev_count << shift);
        delta >>= shift;

        local64_add(delta, &event->count);
}

/*
 * The overflow interrupt is unavailable for SandyBridge-EP, is broken
 * for SandyBridge. So we use hrtimer to periodically poll the counter
 * to avoid overflow.
 */
static enum hrtimer_restart uncore_pmu_hrtimer(struct hrtimer *hrtimer)
{
        struct intel_uncore_box *box;
        struct perf_event *event;
        unsigned long flags;
        int bit;

        box = container_of(hrtimer, struct intel_uncore_box, hrtimer);
        if (!box->n_active || box->cpu != smp_processor_id())
                return HRTIMER_NORESTART;
        /*
         * disable local interrupt to prevent uncore_pmu_event_start/stop
         * to interrupt the update process
         */
        local_irq_save(flags);

        /*
         * handle boxes with an active event list as opposed to active
         * counters
         */
        list_for_each_entry(event, &box->active_list, active_entry) {
                uncore_perf_event_update(box, event);
        }

        for_each_set_bit(bit, box->active_mask, UNCORE_PMC_IDX_MAX)
                uncore_perf_event_update(box, box->events[bit]);

        local_irq_restore(flags);

        hrtimer_forward_now(hrtimer, ns_to_ktime(box->hrtimer_duration));
        return HRTIMER_RESTART;
}

void uncore_pmu_start_hrtimer(struct intel_uncore_box *box)
{
        hrtimer_start(&box->hrtimer, ns_to_ktime(box->hrtimer_duration),
                      HRTIMER_MODE_REL_PINNED);
}

void uncore_pmu_cancel_hrtimer(struct intel_uncore_box *box)
{
        hrtimer_cancel(&box->hrtimer);
}

static void uncore_pmu_init_hrtimer(struct intel_uncore_box *box)
{
        hrtimer_init(&box->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        box->hrtimer.function = uncore_pmu_hrtimer;
}

static struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type,
                                                 int node)
{
        int i, size, numshared = type->num_shared_regs ;
        struct intel_uncore_box *box;

        size = sizeof(*box) + numshared * sizeof(struct intel_uncore_extra_reg);

        box = kzalloc_node(size, GFP_KERNEL, node);
        if (!box)
                return NULL;

        for (i = 0; i < numshared; i++)
                raw_spin_lock_init(&box->shared_regs[i].lock);

        uncore_pmu_init_hrtimer(box);
        box->cpu = -1;
        box->pci_phys_id = -1;
        box->pkgid = -1;

        /* set default hrtimer timeout */
        box->hrtimer_duration = UNCORE_PMU_HRTIMER_INTERVAL;

        INIT_LIST_HEAD(&box->active_list);

        return box;
}

/*
 * Using uncore_pmu_event_init pmu event_init callback
 * as a detection point for uncore events.
 */
static int uncore_pmu_event_init(struct perf_event *event);

static bool is_box_event(struct intel_uncore_box *box, struct perf_event *event)
{
        return &box->pmu->pmu == event->pmu;
}

static int
uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader,
                      bool dogrp)
{
        struct perf_event *event;
        int n, max_count;

        max_count = box->pmu->type->num_counters;
        if (box->pmu->type->fixed_ctl)
                max_count++;

        if (box->n_events >= max_count)
                return -EINVAL;

        n = box->n_events;

        if (is_box_event(box, leader)) {
                box->event_list[n] = leader;
                n++;
        }

        if (!dogrp)
                return n;

        list_for_each_entry(event, &leader->sibling_list, group_entry) {
                if (!is_box_event(box, event) ||
                    event->state <= PERF_EVENT_STATE_OFF)
                        continue;

                if (n >= max_count)
                        return -EINVAL;

                box->event_list[n] = event;
                n++;
        }
        return n;
}

static struct event_constraint *
uncore_get_event_constraint(struct intel_uncore_box *box, struct perf_event *event)
{
        struct intel_uncore_type *type = box->pmu->type;
        struct event_constraint *c;

        if (type->ops->get_constraint) {
                c = type->ops->get_constraint(box, event);
                if (c)
                        return c;
        }

        if (event->attr.config == UNCORE_FIXED_EVENT)
                return &uncore_constraint_fixed;

        if (type->constraints) {
                for_each_event_constraint(c, type->constraints) {
                        if ((event->hw.config & c->cmask) == c->code)
                                return c;
                }
        }

        return &type->unconstrainted;
}

static void uncore_put_event_constraint(struct intel_uncore_box *box,
                                        struct perf_event *event)
{
        if (box->pmu->type->ops->put_constraint)
                box->pmu->type->ops->put_constraint(box, event);
}

static int uncore_assign_events(struct intel_uncore_box *box, int assign[], int n)
{
        unsigned long used_mask[BITS_TO_LONGS(UNCORE_PMC_IDX_MAX)];
        struct event_constraint *c;
        int i, wmin, wmax, ret = 0;
        struct hw_perf_event *hwc;

        bitmap_zero(used_mask, UNCORE_PMC_IDX_MAX);

        for (i = 0, wmin = UNCORE_PMC_IDX_MAX, wmax = 0; i < n; i++) {
                c = uncore_get_event_constraint(box, box->event_list[i]);
                box->event_constraint[i] = c;
                wmin = min(wmin, c->weight);
                wmax = max(wmax, c->weight);
        }

        /* fastpath, try to reuse previous register */
        for (i = 0; i < n; i++) {
                hwc = &box->event_list[i]->hw;
                c = box->event_constraint[i];

                /* never assigned */
                if (hwc->idx == -1)
                        break;

                /* constraint still honored */
                if (!test_bit(hwc->idx, c->idxmsk))
                        break;

                /* not already used */
                if (test_bit(hwc->idx, used_mask))
                        break;

                __set_bit(hwc->idx, used_mask);
                if (assign)
                        assign[i] = hwc->idx;
        }
        /* slow path */
        if (i != n)
                ret = perf_assign_events(box->event_constraint, n,
                                         wmin, wmax, n, assign);

        if (!assign || ret) {
                for (i = 0; i < n; i++)
                        uncore_put_event_constraint(box, box->event_list[i]);
        }
        return ret ? -EINVAL : 0;
}

static void uncore_pmu_event_start(struct perf_event *event, int flags)
{
        struct intel_uncore_box *box = uncore_event_to_box(event);
        int idx = event->hw.idx;

        if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))
                return;

        if (WARN_ON_ONCE(idx == -1 || idx >= UNCORE_PMC_IDX_MAX))
                return;

        event->hw.state = 0;
        box->events[idx] = event;
        box->n_active++;
        __set_bit(idx, box->active_mask);

        local64_set(&event->hw.prev_count, uncore_read_counter(box, event));
        uncore_enable_event(box, event);

        if (box->n_active == 1) {
                uncore_enable_box(box);
                uncore_pmu_start_hrtimer(box);
        }
}

static void uncore_pmu_event_stop(struct perf_event *event, int flags)
{
        struct intel_uncore_box *box = uncore_event_to_box(event);
        struct hw_perf_event *hwc = &event->hw;

        if (__test_and_clear_bit(hwc->idx, box->active_mask)) {
                uncore_disable_event(box, event);
                box->n_active--;
                box->events[hwc->idx] = NULL;
                WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
                hwc->state |= PERF_HES_STOPPED;

                if (box->n_active == 0) {
                        uncore_disable_box(box);
                        uncore_pmu_cancel_hrtimer(box);
                }
        }

        if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
                /*
                 * Drain the remaining delta count out of a event
                 * that we are disabling:
                 */
                uncore_perf_event_update(box, event);
                hwc->state |= PERF_HES_UPTODATE;
        }
}

static int uncore_pmu_event_add(struct perf_event *event, int flags)
{
        struct intel_uncore_box *box = uncore_event_to_box(event);
        struct hw_perf_event *hwc = &event->hw;
        int assign[UNCORE_PMC_IDX_MAX];
        int i, n, ret;

        if (!box)
                return -ENODEV;

        ret = n = uncore_collect_events(box, event, false);
        if (ret < 0)
                return ret;

        hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
        if (!(flags & PERF_EF_START))
                hwc->state |= PERF_HES_ARCH;

        ret = uncore_assign_events(box, assign, n);
        if (ret)
                return ret;

        /* save events moving to new counters */
        for (i = 0; i < box->n_events; i++) {
                event = box->event_list[i];
                hwc = &event->hw;

                if (hwc->idx == assign[i] &&
                        hwc->last_tag == box->tags[assign[i]])
                        continue;
                /*
                 * Ensure we don't accidentally enable a stopped
                 * counter simply because we rescheduled.
                 */
                if (hwc->state & PERF_HES_STOPPED)
                        hwc->state |= PERF_HES_ARCH;

                uncore_pmu_event_stop(event, PERF_EF_UPDATE);
        }

        /* reprogram moved events into new counters */
        for (i = 0; i < n; i++) {
                event = box->event_list[i];
                hwc = &event->hw;

                if (hwc->idx != assign[i] ||
                        hwc->last_tag != box->tags[assign[i]])
                        uncore_assign_hw_event(box, event, assign[i]);
                else if (i < box->n_events)
                        continue;

                if (hwc->state & PERF_HES_ARCH)
                        continue;

                uncore_pmu_event_start(event, 0);
        }
        box->n_events = n;

        return 0;
}

static void uncore_pmu_event_del(struct perf_event *event, int flags)
{
        struct intel_uncore_box *box = uncore_event_to_box(event);
        int i;

        uncore_pmu_event_stop(event, PERF_EF_UPDATE);

        for (i = 0; i < box->n_events; i++) {
                if (event == box->event_list[i]) {
                        uncore_put_event_constraint(box, event);

                        for (++i; i < box->n_events; i++)
                                box->event_list[i - 1] = box->event_list[i];

                        --box->n_events;
                        break;
                }
        }

        event->hw.idx = -1;
        event->hw.last_tag = ~0ULL;
}

void uncore_pmu_event_read(struct perf_event *event)
{
        struct intel_uncore_box *box = uncore_event_to_box(event);
        uncore_perf_event_update(box, event);
}

/*
 * validation ensures the group can be loaded onto the
 * PMU if it was the only group available.
 */
static int uncore_validate_group(struct intel_uncore_pmu *pmu,
                                struct perf_event *event)
{
        struct perf_event *leader = event->group_leader;
        struct intel_uncore_box *fake_box;
        int ret = -EINVAL, n;

        fake_box = uncore_alloc_box(pmu->type, NUMA_NO_NODE);
        if (!fake_box)
                return -ENOMEM;

        fake_box->pmu = pmu;
        /*
         * the event is not yet connected with its
         * siblings therefore we must first collect
         * existing siblings, then add the new event
         * before we can simulate the scheduling
         */
        n = uncore_collect_events(fake_box, leader, true);
        if (n < 0)
                goto out;

        fake_box->n_events = n;
        n = uncore_collect_events(fake_box, event, false);
        if (n < 0)
                goto out;

        fake_box->n_events = n;

        ret = uncore_assign_events(fake_box, NULL, n);
out:
        kfree(fake_box);
        return ret;
}

static int uncore_pmu_event_init(struct perf_event *event)
{
        struct intel_uncore_pmu *pmu;
        struct intel_uncore_box *box;
        struct hw_perf_event *hwc = &event->hw;
        int ret;

        if (event->attr.type != event->pmu->type)
                return -ENOENT;

        pmu = uncore_event_to_pmu(event);
        /* no device found for this pmu */
        if (pmu->func_id < 0)
                return -ENOENT;

        /*
         * Uncore PMU does measure at all privilege level all the time.
         * So it doesn't make sense to specify any exclude bits.
         */
        if (event->attr.exclude_user || event->attr.exclude_kernel ||
                        event->attr.exclude_hv || event->attr.exclude_idle)
                return -EINVAL;

        /* Sampling not supported yet */
        if (hwc->sample_period)
                return -EINVAL;

        /*
         * Place all uncore events for a particular physical package
         * onto a single cpu
         */
        if (event->cpu < 0)
                return -EINVAL;
        box = uncore_pmu_to_box(pmu, event->cpu);
        if (!box || box->cpu < 0)
                return -EINVAL;
        event->cpu = box->cpu;
        event->pmu_private = box;

        event->event_caps |= PERF_EV_CAP_READ_ACTIVE_PKG;

        event->hw.idx = -1;
        event->hw.last_tag = ~0ULL;
        event->hw.extra_reg.idx = EXTRA_REG_NONE;
        event->hw.branch_reg.idx = EXTRA_REG_NONE;

        if (event->attr.config == UNCORE_FIXED_EVENT) {
                /* no fixed counter */
                if (!pmu->type->fixed_ctl)
                        return -EINVAL;
                /*
                 * if there is only one fixed counter, only the first pmu
                 * can access the fixed counter
                 */
                if (pmu->type->single_fixed && pmu->pmu_idx > 0)
                        return -EINVAL;

                /* fixed counters have event field hardcoded to zero */
                hwc->config = 0ULL;
        } else {
                hwc->config = event->attr.config &
                              (pmu->type->event_mask | ((u64)pmu->type->event_mask_ext << 32));
                if (pmu->type->ops->hw_config) {
                        ret = pmu->type->ops->hw_config(box, event);
                        if (ret)
                                return ret;
                }
        }

        if (event->group_leader != event)
                ret = uncore_validate_group(pmu, event);
        else
                ret = 0;

        return ret;
}

static ssize_t uncore_get_attr_cpumask(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        return cpumap_print_to_pagebuf(true, buf, &uncore_cpu_mask);
}

static DEVICE_ATTR(cpumask, S_IRUGO, uncore_get_attr_cpumask, NULL);

static struct attribute *uncore_pmu_attrs[] = {
        &dev_attr_cpumask.attr,
        NULL,
};

static struct attribute_group uncore_pmu_attr_group = {
        .attrs = uncore_pmu_attrs,
};

static int uncore_pmu_register(struct intel_uncore_pmu *pmu)
{
        int ret;

        if (!pmu->type->pmu) {
                pmu->pmu = (struct pmu) {
                        .attr_groups    = pmu->type->attr_groups,
                        .task_ctx_nr    = perf_invalid_context,
                        .event_init     = uncore_pmu_event_init,
                        .add            = uncore_pmu_event_add,
                        .del            = uncore_pmu_event_del,
                        .start          = uncore_pmu_event_start,
                        .stop           = uncore_pmu_event_stop,
                        .read           = uncore_pmu_event_read,
                };
        } else {
                pmu->pmu = *pmu->type->pmu;
                pmu->pmu.attr_groups = pmu->type->attr_groups;
        }

        if (pmu->type->num_boxes == 1) {
                if (strlen(pmu->type->name) > 0)
                        sprintf(pmu->name, "uncore_%s", pmu->type->name);
                else
                        sprintf(pmu->name, "uncore");
        } else {
                sprintf(pmu->name, "uncore_%s_%d", pmu->type->name,
                        pmu->pmu_idx);
        }

        ret = perf_pmu_register(&pmu->pmu, pmu->name, -1);
        if (!ret)
                pmu->registered = true;
        return ret;
}

static void uncore_pmu_unregister(struct intel_uncore_pmu *pmu)
{
        if (!pmu->registered)
                return;
        perf_pmu_unregister(&pmu->pmu);
        pmu->registered = false;
}

static void __uncore_exit_boxes(struct intel_uncore_type *type, int cpu)
{
        struct intel_uncore_pmu *pmu = type->pmus;
        struct intel_uncore_box *box;
        int i, pkg;

        if (pmu) {
                pkg = topology_physical_package_id(cpu);
                for (i = 0; i < type->num_boxes; i++, pmu++) {
                        box = pmu->boxes[pkg];
                        if (box)
                                uncore_box_exit(box);
                }
        }
}

static void uncore_exit_boxes(void *dummy)
{
        struct intel_uncore_type **types;

        for (types = uncore_msr_uncores; *types; types++)
                __uncore_exit_boxes(*types++, smp_processor_id());
}

static void uncore_free_boxes(struct intel_uncore_pmu *pmu)
{
        int pkg;

        for (pkg = 0; pkg < max_packages; pkg++)
                kfree(pmu->boxes[pkg]);
        kfree(pmu->boxes);
}

static void uncore_type_exit(struct intel_uncore_type *type)
{
        struct intel_uncore_pmu *pmu = type->pmus;
        int i;

        if (pmu) {
                for (i = 0; i < type->num_boxes; i++, pmu++) {
                        uncore_pmu_unregister(pmu);
                        uncore_free_boxes(pmu);
                }
                kfree(type->pmus);
                type->pmus = NULL;
        }
        kfree(type->events_group);
        type->events_group = NULL;
}

static void uncore_types_exit(struct intel_uncore_type **types)
{
        for (; *types; types++)
                uncore_type_exit(*types);
}

static int __init uncore_type_init(struct intel_uncore_type *type, bool setid)
{
        struct intel_uncore_pmu *pmus;
        struct attribute_group *attr_group;
        struct attribute **attrs;
        size_t size;
        int i, j;

        pmus = kzalloc(sizeof(*pmus) * type->num_boxes, GFP_KERNEL);
        if (!pmus)
                return -ENOMEM;

        size = max_packages * sizeof(struct intel_uncore_box *);

        for (i = 0; i < type->num_boxes; i++) {
                pmus[i].func_id = setid ? i : -1;
                pmus[i].pmu_idx = i;
                pmus[i].type    = type;
                pmus[i].boxes   = kzalloc(size, GFP_KERNEL);
                if (!pmus[i].boxes)
                        return -ENOMEM;
        }

        type->pmus = pmus;
        type->unconstrainted = (struct event_constraint)
                __EVENT_CONSTRAINT(0, (1ULL << type->num_counters) - 1,
                                0, type->num_counters, 0, 0);

        if (type->event_descs) {
                for (i = 0; type->event_descs[i].attr.attr.name; i++);

                attr_group = kzalloc(sizeof(struct attribute *) * (i + 1) +
                                        sizeof(*attr_group), GFP_KERNEL);
                if (!attr_group)
                        return -ENOMEM;

                attrs = (struct attribute **)(attr_group + 1);
                attr_group->name = "events";
                attr_group->attrs = attrs;

                for (j = 0; j < i; j++)
                        attrs[j] = &type->event_descs[j].attr.attr;

                type->events_group = attr_group;
        }

        type->pmu_group = &uncore_pmu_attr_group;
        return 0;
}

static int __init
uncore_types_init(struct intel_uncore_type **types, bool setid)
{
        int ret;

        for (; *types; types++) {
                ret = uncore_type_init(*types, setid);
                if (ret)
                        return ret;
        }
        return 0;
}

/*
 * add a pci uncore device
 */
static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
        struct intel_uncore_type *type;
        struct intel_uncore_pmu *pmu = NULL;
        struct intel_uncore_box *box;
        int phys_id, pkg, ret;

        phys_id = uncore_pcibus_to_physid(pdev->bus);
        if (phys_id < 0)
                return -ENODEV;

        pkg = topology_phys_to_logical_pkg(phys_id);
        if (pkg < 0)
                return -EINVAL;

        if (UNCORE_PCI_DEV_TYPE(id->driver_data) == UNCORE_EXTRA_PCI_DEV) {
                int idx = UNCORE_PCI_DEV_IDX(id->driver_data);

                uncore_extra_pci_dev[pkg].dev[idx] = pdev;
                pci_set_drvdata(pdev, NULL);
                return 0;
        }

        type = uncore_pci_uncores[UNCORE_PCI_DEV_TYPE(id->driver_data)];

        /*
         * Some platforms, e.g.  Knights Landing, use a common PCI device ID
         * for multiple instances of an uncore PMU device type. We should check
         * PCI slot and func to indicate the uncore box.
         */
        if (id->driver_data & ~0xffff) {
                struct pci_driver *pci_drv = pdev->driver;
                const struct pci_device_id *ids = pci_drv->id_table;
                unsigned int devfn;

                while (ids && ids->vendor) {
                        if ((ids->vendor == pdev->vendor) &&
                            (ids->device == pdev->device)) {
                                devfn = PCI_DEVFN(UNCORE_PCI_DEV_DEV(ids->driver_data),
                                                  UNCORE_PCI_DEV_FUNC(ids->driver_data));
                                if (devfn == pdev->devfn) {
                                        pmu = &type->pmus[UNCORE_PCI_DEV_IDX(ids->driver_data)];
                                        break;
                                }
                        }
                        ids++;
                }
                if (pmu == NULL)
                        return -ENODEV;
        } else {
                /*
                 * for performance monitoring unit with multiple boxes,
                 * each box has a different function id.
                 */
                pmu = &type->pmus[UNCORE_PCI_DEV_IDX(id->driver_data)];
        }

        if (WARN_ON_ONCE(pmu->boxes[pkg] != NULL))
                return -EINVAL;

        box = uncore_alloc_box(type, NUMA_NO_NODE);
        if (!box)
                return -ENOMEM;

        if (pmu->func_id < 0)
                pmu->func_id = pdev->devfn;
        else
                WARN_ON_ONCE(pmu->func_id != pdev->devfn);

        atomic_inc(&box->refcnt);
        box->pci_phys_id = phys_id;
        box->pkgid = pkg;
        box->pci_dev = pdev;
        box->pmu = pmu;
        uncore_box_init(box);
        pci_set_drvdata(pdev, box);

        pmu->boxes[pkg] = box;
        if (atomic_inc_return(&pmu->activeboxes) > 1)
                return 0;

        /* First active box registers the pmu */
        ret = uncore_pmu_register(pmu);
        if (ret) {
                pci_set_drvdata(pdev, NULL);
                pmu->boxes[pkg] = NULL;
                uncore_box_exit(box);
                kfree(box);
        }
        return ret;
}

static void uncore_pci_remove(struct pci_dev *pdev)
{
        struct intel_uncore_box *box;
        struct intel_uncore_pmu *pmu;
        int i, phys_id, pkg;

        phys_id = uncore_pcibus_to_physid(pdev->bus);
        pkg = topology_phys_to_logical_pkg(phys_id);

        box = pci_get_drvdata(pdev);
        if (!box) {
                for (i = 0; i < UNCORE_EXTRA_PCI_DEV_MAX; i++) {
                        if (uncore_extra_pci_dev[pkg].dev[i] == pdev) {
                                uncore_extra_pci_dev[pkg].dev[i] = NULL;
                                break;
                        }
                }
                WARN_ON_ONCE(i >= UNCORE_EXTRA_PCI_DEV_MAX);
                return;
        }

        pmu = box->pmu;
        if (WARN_ON_ONCE(phys_id != box->pci_phys_id))
                return;

        pci_set_drvdata(pdev, NULL);
        pmu->boxes[pkg] = NULL;
        if (atomic_dec_return(&pmu->activeboxes) == 0)
                uncore_pmu_unregister(pmu);
        uncore_box_exit(box);
        kfree(box);
}

static int __init uncore_pci_init(void)
{
        size_t size;
        int ret;

        size = max_packages * sizeof(struct pci_extra_dev);
        uncore_extra_pci_dev = kzalloc(size, GFP_KERNEL);
        if (!uncore_extra_pci_dev) {
                ret = -ENOMEM;
                goto err;
        }

        ret = uncore_types_init(uncore_pci_uncores, false);
        if (ret)
                goto errtype;

        uncore_pci_driver->probe = uncore_pci_probe;
        uncore_pci_driver->remove = uncore_pci_remove;

        ret = pci_register_driver(uncore_pci_driver);
        if (ret)
                goto errtype;

        pcidrv_registered = true;
        return 0;

errtype:
        uncore_types_exit(uncore_pci_uncores);
        kfree(uncore_extra_pci_dev);
        uncore_extra_pci_dev = NULL;
        uncore_free_pcibus_map();
err:
        uncore_pci_uncores = empty_uncore;
        return ret;
}

static void uncore_pci_exit(void)
{
        if (pcidrv_registered) {
                pcidrv_registered = false;
                pci_unregister_driver(uncore_pci_driver);
                uncore_types_exit(uncore_pci_uncores);
                kfree(uncore_extra_pci_dev);
                uncore_free_pcibus_map();
        }
}

static int uncore_cpu_dying(unsigned int cpu)
{
        struct intel_uncore_type *type, **types = uncore_msr_uncores;
        struct intel_uncore_pmu *pmu;
        struct intel_uncore_box *box;
        int i, pkg;

        pkg = topology_logical_package_id(cpu);
        for (; *types; types++) {
                type = *types;
                pmu = type->pmus;
                for (i = 0; i < type->num_boxes; i++, pmu++) {
                        box = pmu->boxes[pkg];
                        if (box && atomic_dec_return(&box->refcnt) == 0)
                                uncore_box_exit(box);
                }
        }
        return 0;
}

static int first_init;

static int uncore_cpu_starting(unsigned int cpu)
{
        struct intel_uncore_type *type, **types = uncore_msr_uncores;
        struct intel_uncore_pmu *pmu;
        struct intel_uncore_box *box;
        int i, pkg, ncpus = 1;

        if (first_init) {
                /*
                 * On init we get the number of online cpus in the package
                 * and set refcount for all of them.
                 */
                ncpus = cpumask_weight(topology_core_cpumask(cpu));
        }

        pkg = topology_logical_package_id(cpu);
        for (; *types; types++) {
                type = *types;
                pmu = type->pmus;
                for (i = 0; i < type->num_boxes; i++, pmu++) {
                        box = pmu->boxes[pkg];
                        if (!box)
                                continue;
                        /* The first cpu on a package activates the box */
                        if (atomic_add_return(ncpus, &box->refcnt) == ncpus)
                                uncore_box_init(box);
                }
        }

        return 0;
}

static int uncore_cpu_prepare(unsigned int cpu)
{
        struct intel_uncore_type *type, **types = uncore_msr_uncores;
        struct intel_uncore_pmu *pmu;
        struct intel_uncore_box *box;
        int i, pkg;

        pkg = topology_logical_package_id(cpu);
        for (; *types; types++) {
                type = *types;
                pmu = type->pmus;
                for (i = 0; i < type->num_boxes; i++, pmu++) {
                        if (pmu->boxes[pkg])
                                continue;
                        /* First cpu of a package allocates the box */
                        box = uncore_alloc_box(type, cpu_to_node(cpu));
                        if (!box)
                                return -ENOMEM;
                        box->pmu = pmu;
                        box->pkgid = pkg;
                        pmu->boxes[pkg] = box;
                }
        }
        return 0;
}

static void uncore_change_type_ctx(struct intel_uncore_type *type, int old_cpu,
                                   int new_cpu)
{
        struct intel_uncore_pmu *pmu = type->pmus;
        struct intel_uncore_box *box;
        int i, pkg;

        pkg = topology_logical_package_id(old_cpu < 0 ? new_cpu : old_cpu);
        for (i = 0; i < type->num_boxes; i++, pmu++) {
                box = pmu->boxes[pkg];
                if (!box)
                        continue;

                if (old_cpu < 0) {
                        WARN_ON_ONCE(box->cpu != -1);
                        box->cpu = new_cpu;
                        continue;
                }

                WARN_ON_ONCE(box->cpu != old_cpu);
                box->cpu = -1;
                if (new_cpu < 0)
                        continue;

                uncore_pmu_cancel_hrtimer(box);
                perf_pmu_migrate_context(&pmu->pmu, old_cpu, new_cpu);
                box->cpu = new_cpu;
        }
}

static void uncore_change_context(struct intel_uncore_type **uncores,
                                  int old_cpu, int new_cpu)
{
        for (; *uncores; uncores++)
                uncore_change_type_ctx(*uncores, old_cpu, new_cpu);
}

static int uncore_event_cpu_offline(unsigned int cpu)
{
        int target;

        /* Check if exiting cpu is used for collecting uncore events */
        if (!cpumask_test_and_clear_cpu(cpu, &uncore_cpu_mask))
                return 0;

        /* Find a new cpu to collect uncore events */
        target = cpumask_any_but(topology_core_cpumask(cpu), cpu);

        /* Migrate uncore events to the new target */
        if (target < nr_cpu_ids)
                cpumask_set_cpu(target, &uncore_cpu_mask);
        else
                target = -1;

        uncore_change_context(uncore_msr_uncores, cpu, target);
        uncore_change_context(uncore_pci_uncores, cpu, target);
        return 0;
}

static int uncore_event_cpu_online(unsigned int cpu)
{
        int target;

        /*
         * Check if there is an online cpu in the package
         * which collects uncore events already.
         */
        target = cpumask_any_and(&uncore_cpu_mask, topology_core_cpumask(cpu));
        if (target < nr_cpu_ids)
                return 0;

        cpumask_set_cpu(cpu, &uncore_cpu_mask);

        uncore_change_context(uncore_msr_uncores, -1, cpu);
        uncore_change_context(uncore_pci_uncores, -1, cpu);
        return 0;
}

static int __init type_pmu_register(struct intel_uncore_type *type)
{
        int i, ret;

        for (i = 0; i < type->num_boxes; i++) {
                ret = uncore_pmu_register(&type->pmus[i]);
                if (ret)
                        return ret;
        }
        return 0;
}

static int __init uncore_msr_pmus_register(void)
{
        struct intel_uncore_type **types = uncore_msr_uncores;
        int ret;

        for (; *types; types++) {
                ret = type_pmu_register(*types);
                if (ret)
                        return ret;
        }
        return 0;
}

static int __init uncore_cpu_init(void)
{
        int ret;

        ret = uncore_types_init(uncore_msr_uncores, true);
        if (ret)
                goto err;

        ret = uncore_msr_pmus_register();
        if (ret)
                goto err;
        return 0;
err:
        uncore_types_exit(uncore_msr_uncores);
        uncore_msr_uncores = empty_uncore;
        return ret;
}

#define X86_UNCORE_MODEL_MATCH(model, init)     \
        { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&init }

struct intel_uncore_init_fun {
        void    (*cpu_init)(void);
        int     (*pci_init)(void);
};

static const struct intel_uncore_init_fun nhm_uncore_init __initconst = {
        .cpu_init = nhm_uncore_cpu_init,
};

static const struct intel_uncore_init_fun snb_uncore_init __initconst = {
        .cpu_init = snb_uncore_cpu_init,
        .pci_init = snb_uncore_pci_init,
};

static const struct intel_uncore_init_fun ivb_uncore_init __initconst = {
        .cpu_init = snb_uncore_cpu_init,
        .pci_init = ivb_uncore_pci_init,
};

static const struct intel_uncore_init_fun hsw_uncore_init __initconst = {
        .cpu_init = snb_uncore_cpu_init,
        .pci_init = hsw_uncore_pci_init,
};

static const struct intel_uncore_init_fun bdw_uncore_init __initconst = {
        .cpu_init = snb_uncore_cpu_init,
        .pci_init = bdw_uncore_pci_init,
};

static const struct intel_uncore_init_fun snbep_uncore_init __initconst = {
        .cpu_init = snbep_uncore_cpu_init,
        .pci_init = snbep_uncore_pci_init,
};

static const struct intel_uncore_init_fun nhmex_uncore_init __initconst = {
        .cpu_init = nhmex_uncore_cpu_init,
};

static const struct intel_uncore_init_fun ivbep_uncore_init __initconst = {
        .cpu_init = ivbep_uncore_cpu_init,
        .pci_init = ivbep_uncore_pci_init,
};

static const struct intel_uncore_init_fun hswep_uncore_init __initconst = {
        .cpu_init = hswep_uncore_cpu_init,
        .pci_init = hswep_uncore_pci_init,
};

static const struct intel_uncore_init_fun bdx_uncore_init __initconst = {
        .cpu_init = bdx_uncore_cpu_init,
        .pci_init = bdx_uncore_pci_init,
};

static const struct intel_uncore_init_fun knl_uncore_init __initconst = {
        .cpu_init = knl_uncore_cpu_init,
        .pci_init = knl_uncore_pci_init,
};

static const struct intel_uncore_init_fun skl_uncore_init __initconst = {
        .cpu_init = skl_uncore_cpu_init,
        .pci_init = skl_uncore_pci_init,
};

static const struct intel_uncore_init_fun skx_uncore_init __initconst = {
        .cpu_init = skx_uncore_cpu_init,
        .pci_init = skx_uncore_pci_init,
};

static const struct x86_cpu_id intel_uncore_match[] __initconst = {
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_NEHALEM_EP,     nhm_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_NEHALEM,        nhm_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_WESTMERE,       nhm_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_WESTMERE_EP,    nhm_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_SANDYBRIDGE,    snb_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_IVYBRIDGE,      ivb_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_HASWELL_CORE,   hsw_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_HASWELL_ULT,    hsw_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_HASWELL_GT3E,   hsw_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_BROADWELL_CORE, bdw_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_BROADWELL_GT3E, bdw_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_SANDYBRIDGE_X,  snbep_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_NEHALEM_EX,     nhmex_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_WESTMERE_EX,    nhmex_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_IVYBRIDGE_X,    ivbep_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_HASWELL_X,      hswep_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_BROADWELL_X,    bdx_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_BROADWELL_XEON_D, bdx_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_XEON_PHI_KNL,   knl_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_XEON_PHI_KNM,   knl_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_SKYLAKE_DESKTOP,skl_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_SKYLAKE_MOBILE, skl_uncore_init),
        X86_UNCORE_MODEL_MATCH(INTEL_FAM6_SKYLAKE_X,      skx_uncore_init),
        {},
};

MODULE_DEVICE_TABLE(x86cpu, intel_uncore_match);

static int __init intel_uncore_init(void)
{
        const struct x86_cpu_id *id;
        struct intel_uncore_init_fun *uncore_init;
        int pret = 0, cret = 0, ret;

        id = x86_match_cpu(intel_uncore_match);
        if (!id)
                return -ENODEV;

        if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
                return -ENODEV;

        max_packages = topology_max_packages();

        uncore_init = (struct intel_uncore_init_fun *)id->driver_data;
        if (uncore_init->pci_init) {
                pret = uncore_init->pci_init();
                if (!pret)
                        pret = uncore_pci_init();
        }

        if (uncore_init->cpu_init) {
                uncore_init->cpu_init();
                cret = uncore_cpu_init();
        }

        if (cret && pret)
                return -ENODEV;

        /*
         * Install callbacks. Core will call them for each online cpu.
         *
         * The first online cpu of each package allocates and takes
         * the refcounts for all other online cpus in that package.
         * If msrs are not enabled no allocation is required and
         * uncore_cpu_prepare() is not called for each online cpu.
         */
        if (!cret) {
               ret = cpuhp_setup_state(CPUHP_PERF_X86_UNCORE_PREP,
                                        "PERF_X86_UNCORE_PREP",
                                        uncore_cpu_prepare, NULL);
                if (ret)
                        goto err;
        } else {
                cpuhp_setup_state_nocalls(CPUHP_PERF_X86_UNCORE_PREP,
                                          "PERF_X86_UNCORE_PREP",
                                          uncore_cpu_prepare, NULL);
        }
        first_init = 1;
        cpuhp_setup_state(CPUHP_AP_PERF_X86_UNCORE_STARTING,
                          "AP_PERF_X86_UNCORE_STARTING",
                          uncore_cpu_starting, uncore_cpu_dying);
        first_init = 0;
        cpuhp_setup_state(CPUHP_AP_PERF_X86_UNCORE_ONLINE,
                          "AP_PERF_X86_UNCORE_ONLINE",
                          uncore_event_cpu_online, uncore_event_cpu_offline);
        return 0;

err:
        /* Undo box->init_box() */
        on_each_cpu_mask(&uncore_cpu_mask, uncore_exit_boxes, NULL, 1);
        uncore_types_exit(uncore_msr_uncores);
        uncore_pci_exit();
        return ret;
}
module_init(intel_uncore_init);

static void __exit intel_uncore_exit(void)
{
        cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_UNCORE_ONLINE);
        cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_UNCORE_STARTING);
        cpuhp_remove_state_nocalls(CPUHP_PERF_X86_UNCORE_PREP);
        uncore_types_exit(uncore_msr_uncores);
        uncore_pci_exit();
}
module_exit(intel_uncore_exit);