linux/drivers/perf/thunderx2_pmu.c

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// SPDX-License-Identifier: GPL-2.0
/*
* CAVIUM THUNDERX2 SoC PMU UNCORE
* Copyright (C) 2018 Cavium Inc.
* Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
*/
#include <linux/acpi.h>
#include <linux/cpuhotplug.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
/* Each ThunderX2(TX2) Socket has a L3C and DMC UNCORE PMU device.
* Each UNCORE PMU device consists of 4 independent programmable counters.
* Counters are 32 bit and do not support overflow interrupt,
* they need to be sampled before overflow(i.e, at every 2 seconds).
*/
#define TX2_PMU_MAX_COUNTERS 4
#define TX2_PMU_DMC_CHANNELS 8
#define TX2_PMU_L3_TILES 16
#define TX2_PMU_HRTIMER_INTERVAL (2 * NSEC_PER_SEC)
#define GET_EVENTID(ev) ((ev->hw.config) & 0x1f)
#define GET_COUNTERID(ev) ((ev->hw.idx) & 0x3)
/* 1 byte per counter(4 counters).
* Event id is encoded in bits [5:1] of a byte,
*/
#define DMC_EVENT_CFG(idx, val) ((val) << (((idx) * 8) + 1))
#define L3C_COUNTER_CTL 0xA8
#define L3C_COUNTER_DATA 0xAC
#define DMC_COUNTER_CTL 0x234
#define DMC_COUNTER_DATA 0x240
/* L3C event IDs */
#define L3_EVENT_READ_REQ 0xD
#define L3_EVENT_WRITEBACK_REQ 0xE
#define L3_EVENT_INV_N_WRITE_REQ 0xF
#define L3_EVENT_INV_REQ 0x10
#define L3_EVENT_EVICT_REQ 0x13
#define L3_EVENT_INV_N_WRITE_HIT 0x14
#define L3_EVENT_INV_HIT 0x15
#define L3_EVENT_READ_HIT 0x17
#define L3_EVENT_MAX 0x18
/* DMC event IDs */
#define DMC_EVENT_COUNT_CYCLES 0x1
#define DMC_EVENT_WRITE_TXNS 0xB
#define DMC_EVENT_DATA_TRANSFERS 0xD
#define DMC_EVENT_READ_TXNS 0xF
#define DMC_EVENT_MAX 0x10
enum tx2_uncore_type {
PMU_TYPE_L3C,
PMU_TYPE_DMC,
PMU_TYPE_INVALID,
};
/*
* pmu on each socket has 2 uncore devices(dmc and l3c),
* each device has 4 counters.
*/
struct tx2_uncore_pmu {
struct hlist_node hpnode;
struct list_head entry;
struct pmu pmu;
char *name;
int node;
int cpu;
u32 max_counters;
u32 prorate_factor;
u32 max_events;
u64 hrtimer_interval;
void __iomem *base;
DECLARE_BITMAP(active_counters, TX2_PMU_MAX_COUNTERS);
struct perf_event *events[TX2_PMU_MAX_COUNTERS];
struct device *dev;
struct hrtimer hrtimer;
const struct attribute_group **attr_groups;
enum tx2_uncore_type type;
void (*init_cntr_base)(struct perf_event *event,
struct tx2_uncore_pmu *tx2_pmu);
void (*stop_event)(struct perf_event *event);
void (*start_event)(struct perf_event *event, int flags);
};
static LIST_HEAD(tx2_pmus);
static inline struct tx2_uncore_pmu *pmu_to_tx2_pmu(struct pmu *pmu)
{
return container_of(pmu, struct tx2_uncore_pmu, pmu);
}
PMU_FORMAT_ATTR(event, "config:0-4");
static struct attribute *l3c_pmu_format_attrs[] = {
&format_attr_event.attr,
NULL,
};
static struct attribute *dmc_pmu_format_attrs[] = {
&format_attr_event.attr,
NULL,
};
static const struct attribute_group l3c_pmu_format_attr_group = {
.name = "format",
.attrs = l3c_pmu_format_attrs,
};
static const struct attribute_group dmc_pmu_format_attr_group = {
.name = "format",
.attrs = dmc_pmu_format_attrs,
};
/*
* sysfs event attributes
*/
static ssize_t tx2_pmu_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_ext_attribute *eattr;
eattr = container_of(attr, struct dev_ext_attribute, attr);
return sprintf(buf, "event=0x%lx\n", (unsigned long) eattr->var);
}
#define TX2_EVENT_ATTR(name, config) \
PMU_EVENT_ATTR(name, tx2_pmu_event_attr_##name, \
config, tx2_pmu_event_show)
TX2_EVENT_ATTR(read_request, L3_EVENT_READ_REQ);
TX2_EVENT_ATTR(writeback_request, L3_EVENT_WRITEBACK_REQ);
TX2_EVENT_ATTR(inv_nwrite_request, L3_EVENT_INV_N_WRITE_REQ);
TX2_EVENT_ATTR(inv_request, L3_EVENT_INV_REQ);
TX2_EVENT_ATTR(evict_request, L3_EVENT_EVICT_REQ);
TX2_EVENT_ATTR(inv_nwrite_hit, L3_EVENT_INV_N_WRITE_HIT);
TX2_EVENT_ATTR(inv_hit, L3_EVENT_INV_HIT);
TX2_EVENT_ATTR(read_hit, L3_EVENT_READ_HIT);
static struct attribute *l3c_pmu_events_attrs[] = {
&tx2_pmu_event_attr_read_request.attr.attr,
&tx2_pmu_event_attr_writeback_request.attr.attr,
&tx2_pmu_event_attr_inv_nwrite_request.attr.attr,
&tx2_pmu_event_attr_inv_request.attr.attr,
&tx2_pmu_event_attr_evict_request.attr.attr,
&tx2_pmu_event_attr_inv_nwrite_hit.attr.attr,
&tx2_pmu_event_attr_inv_hit.attr.attr,
&tx2_pmu_event_attr_read_hit.attr.attr,
NULL,
};
TX2_EVENT_ATTR(cnt_cycles, DMC_EVENT_COUNT_CYCLES);
TX2_EVENT_ATTR(write_txns, DMC_EVENT_WRITE_TXNS);
TX2_EVENT_ATTR(data_transfers, DMC_EVENT_DATA_TRANSFERS);
TX2_EVENT_ATTR(read_txns, DMC_EVENT_READ_TXNS);
static struct attribute *dmc_pmu_events_attrs[] = {
&tx2_pmu_event_attr_cnt_cycles.attr.attr,
&tx2_pmu_event_attr_write_txns.attr.attr,
&tx2_pmu_event_attr_data_transfers.attr.attr,
&tx2_pmu_event_attr_read_txns.attr.attr,
NULL,
};
static const struct attribute_group l3c_pmu_events_attr_group = {
.name = "events",
.attrs = l3c_pmu_events_attrs,
};
static const struct attribute_group dmc_pmu_events_attr_group = {
.name = "events",
.attrs = dmc_pmu_events_attrs,
};
/*
* sysfs cpumask attributes
*/
static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tx2_uncore_pmu *tx2_pmu;
tx2_pmu = pmu_to_tx2_pmu(dev_get_drvdata(dev));
return cpumap_print_to_pagebuf(true, buf, cpumask_of(tx2_pmu->cpu));
}
static DEVICE_ATTR_RO(cpumask);
static struct attribute *tx2_pmu_cpumask_attrs[] = {
&dev_attr_cpumask.attr,
NULL,
};
static const struct attribute_group pmu_cpumask_attr_group = {
.attrs = tx2_pmu_cpumask_attrs,
};
/*
* Per PMU device attribute groups
*/
static const struct attribute_group *l3c_pmu_attr_groups[] = {
&l3c_pmu_format_attr_group,
&pmu_cpumask_attr_group,
&l3c_pmu_events_attr_group,
NULL
};
static const struct attribute_group *dmc_pmu_attr_groups[] = {
&dmc_pmu_format_attr_group,
&pmu_cpumask_attr_group,
&dmc_pmu_events_attr_group,
NULL
};
static inline u32 reg_readl(unsigned long addr)
{
return readl((void __iomem *)addr);
}
static inline void reg_writel(u32 val, unsigned long addr)
{
writel(val, (void __iomem *)addr);
}
static int alloc_counter(struct tx2_uncore_pmu *tx2_pmu)
{
int counter;
counter = find_first_zero_bit(tx2_pmu->active_counters,
tx2_pmu->max_counters);
if (counter == tx2_pmu->max_counters)
return -ENOSPC;
set_bit(counter, tx2_pmu->active_counters);
return counter;
}
static inline void free_counter(struct tx2_uncore_pmu *tx2_pmu, int counter)
{
clear_bit(counter, tx2_pmu->active_counters);
}
static void init_cntr_base_l3c(struct perf_event *event,
struct tx2_uncore_pmu *tx2_pmu)
{
struct hw_perf_event *hwc = &event->hw;
/* counter ctrl/data reg offset at 8 */
hwc->config_base = (unsigned long)tx2_pmu->base
+ L3C_COUNTER_CTL + (8 * GET_COUNTERID(event));
hwc->event_base = (unsigned long)tx2_pmu->base
+ L3C_COUNTER_DATA + (8 * GET_COUNTERID(event));
}
static void init_cntr_base_dmc(struct perf_event *event,
struct tx2_uncore_pmu *tx2_pmu)
{
struct hw_perf_event *hwc = &event->hw;
hwc->config_base = (unsigned long)tx2_pmu->base
+ DMC_COUNTER_CTL;
/* counter data reg offset at 0xc */
hwc->event_base = (unsigned long)tx2_pmu->base
+ DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event));
}
static void uncore_start_event_l3c(struct perf_event *event, int flags)
{
u32 val;
struct hw_perf_event *hwc = &event->hw;
/* event id encoded in bits [07:03] */
val = GET_EVENTID(event) << 3;
reg_writel(val, hwc->config_base);
local64_set(&hwc->prev_count, 0);
reg_writel(0, hwc->event_base);
}
static inline void uncore_stop_event_l3c(struct perf_event *event)
{
reg_writel(0, event->hw.config_base);
}
static void uncore_start_event_dmc(struct perf_event *event, int flags)
{
u32 val;
struct hw_perf_event *hwc = &event->hw;
int idx = GET_COUNTERID(event);
int event_id = GET_EVENTID(event);
/* enable and start counters.
* 8 bits for each counter, bits[05:01] of a counter to set event type.
*/
val = reg_readl(hwc->config_base);
val &= ~DMC_EVENT_CFG(idx, 0x1f);
val |= DMC_EVENT_CFG(idx, event_id);
reg_writel(val, hwc->config_base);
local64_set(&hwc->prev_count, 0);
reg_writel(0, hwc->event_base);
}
static void uncore_stop_event_dmc(struct perf_event *event)
{
u32 val;
struct hw_perf_event *hwc = &event->hw;
int idx = GET_COUNTERID(event);
/* clear event type(bits[05:01]) to stop counter */
val = reg_readl(hwc->config_base);
val &= ~DMC_EVENT_CFG(idx, 0x1f);
reg_writel(val, hwc->config_base);
}
static void tx2_uncore_event_update(struct perf_event *event)
{
s64 prev, delta, new = 0;
struct hw_perf_event *hwc = &event->hw;
struct tx2_uncore_pmu *tx2_pmu;
enum tx2_uncore_type type;
u32 prorate_factor;
tx2_pmu = pmu_to_tx2_pmu(event->pmu);
type = tx2_pmu->type;
prorate_factor = tx2_pmu->prorate_factor;
new = reg_readl(hwc->event_base);
prev = local64_xchg(&hwc->prev_count, new);
/* handles rollover of 32 bit counter */
delta = (u32)(((1UL << 32) - prev) + new);
/* DMC event data_transfers granularity is 16 Bytes, convert it to 64 */
if (type == PMU_TYPE_DMC &&
GET_EVENTID(event) == DMC_EVENT_DATA_TRANSFERS)
delta = delta/4;
/* L3C and DMC has 16 and 8 interleave channels respectively.
* The sampled value is for channel 0 and multiplied with
* prorate_factor to get the count for a device.
*/
local64_add(delta * prorate_factor, &event->count);
}
static enum tx2_uncore_type get_tx2_pmu_type(struct acpi_device *adev)
{
int i = 0;
struct acpi_tx2_pmu_device {
__u8 id[ACPI_ID_LEN];
enum tx2_uncore_type type;
} devices[] = {
{"CAV901D", PMU_TYPE_L3C},
{"CAV901F", PMU_TYPE_DMC},
{"", PMU_TYPE_INVALID}
};
while (devices[i].type != PMU_TYPE_INVALID) {
if (!strcmp(acpi_device_hid(adev), devices[i].id))
break;
i++;
}
return devices[i].type;
}
static bool tx2_uncore_validate_event(struct pmu *pmu,
struct perf_event *event, int *counters)
{
if (is_software_event(event))
return true;
/* Reject groups spanning multiple HW PMUs. */
if (event->pmu != pmu)
return false;
*counters = *counters + 1;
return true;
}
/*
* Make sure the group of events can be scheduled at once
* on the PMU.
*/
static bool tx2_uncore_validate_event_group(struct perf_event *event)
{
struct perf_event *sibling, *leader = event->group_leader;
int counters = 0;
if (event->group_leader == event)
return true;
if (!tx2_uncore_validate_event(event->pmu, leader, &counters))
return false;
for_each_sibling_event(sibling, leader) {
if (!tx2_uncore_validate_event(event->pmu, sibling, &counters))
return false;
}
if (!tx2_uncore_validate_event(event->pmu, event, &counters))
return false;
/*
* If the group requires more counters than the HW has,
* it cannot ever be scheduled.
*/
return counters <= TX2_PMU_MAX_COUNTERS;
}
static int tx2_uncore_event_init(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
struct tx2_uncore_pmu *tx2_pmu;
/* Test the event attr type check for PMU enumeration */
if (event->attr.type != event->pmu->type)
return -ENOENT;
/*
* SOC PMU counters are shared across all cores.
* Therefore, it does not support per-process mode.
* Also, it does not support event sampling mode.
*/
if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
return -EINVAL;
/* We have no filtering of any kind */
if (event->attr.exclude_user ||
event->attr.exclude_kernel ||
event->attr.exclude_hv ||
event->attr.exclude_idle ||
event->attr.exclude_host ||
event->attr.exclude_guest)
return -EINVAL;
if (event->cpu < 0)
return -EINVAL;
tx2_pmu = pmu_to_tx2_pmu(event->pmu);
if (tx2_pmu->cpu >= nr_cpu_ids)
return -EINVAL;
event->cpu = tx2_pmu->cpu;
if (event->attr.config >= tx2_pmu->max_events)
return -EINVAL;
/* store event id */
hwc->config = event->attr.config;
/* Validate the group */
if (!tx2_uncore_validate_event_group(event))
return -EINVAL;
return 0;
}
static void tx2_uncore_event_start(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
struct tx2_uncore_pmu *tx2_pmu;
hwc->state = 0;
tx2_pmu = pmu_to_tx2_pmu(event->pmu);
tx2_pmu->start_event(event, flags);
perf_event_update_userpage(event);
/* Start timer for first event */
if (bitmap_weight(tx2_pmu->active_counters,
tx2_pmu->max_counters) == 1) {
hrtimer_start(&tx2_pmu->hrtimer,
ns_to_ktime(tx2_pmu->hrtimer_interval),
HRTIMER_MODE_REL_PINNED);
}
}
static void tx2_uncore_event_stop(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
struct tx2_uncore_pmu *tx2_pmu;
if (hwc->state & PERF_HES_UPTODATE)
return;
tx2_pmu = pmu_to_tx2_pmu(event->pmu);
tx2_pmu->stop_event(event);
WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
hwc->state |= PERF_HES_STOPPED;
if (flags & PERF_EF_UPDATE) {
tx2_uncore_event_update(event);
hwc->state |= PERF_HES_UPTODATE;
}
}
static int tx2_uncore_event_add(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
struct tx2_uncore_pmu *tx2_pmu;
tx2_pmu = pmu_to_tx2_pmu(event->pmu);
/* Allocate a free counter */
hwc->idx = alloc_counter(tx2_pmu);
if (hwc->idx < 0)
return -EAGAIN;
tx2_pmu->events[hwc->idx] = event;
/* set counter control and data registers base address */
tx2_pmu->init_cntr_base(event, tx2_pmu);
hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
if (flags & PERF_EF_START)
tx2_uncore_event_start(event, flags);
return 0;
}
static void tx2_uncore_event_del(struct perf_event *event, int flags)
{
struct tx2_uncore_pmu *tx2_pmu = pmu_to_tx2_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
tx2_uncore_event_stop(event, PERF_EF_UPDATE);
/* clear the assigned counter */
free_counter(tx2_pmu, GET_COUNTERID(event));
perf_event_update_userpage(event);
tx2_pmu->events[hwc->idx] = NULL;
hwc->idx = -1;
}
static void tx2_uncore_event_read(struct perf_event *event)
{
tx2_uncore_event_update(event);
}
static enum hrtimer_restart tx2_hrtimer_callback(struct hrtimer *timer)
{
struct tx2_uncore_pmu *tx2_pmu;
int max_counters, idx;
tx2_pmu = container_of(timer, struct tx2_uncore_pmu, hrtimer);
max_counters = tx2_pmu->max_counters;
if (bitmap_empty(tx2_pmu->active_counters, max_counters))
return HRTIMER_NORESTART;
for_each_set_bit(idx, tx2_pmu->active_counters, max_counters) {
struct perf_event *event = tx2_pmu->events[idx];
tx2_uncore_event_update(event);
}
hrtimer_forward_now(timer, ns_to_ktime(tx2_pmu->hrtimer_interval));
return HRTIMER_RESTART;
}
static int tx2_uncore_pmu_register(
struct tx2_uncore_pmu *tx2_pmu)
{
struct device *dev = tx2_pmu->dev;
char *name = tx2_pmu->name;
/* Perf event registration */
tx2_pmu->pmu = (struct pmu) {
.module = THIS_MODULE,
.attr_groups = tx2_pmu->attr_groups,
.task_ctx_nr = perf_invalid_context,
.event_init = tx2_uncore_event_init,
.add = tx2_uncore_event_add,
.del = tx2_uncore_event_del,
.start = tx2_uncore_event_start,
.stop = tx2_uncore_event_stop,
.read = tx2_uncore_event_read,
};
tx2_pmu->pmu.name = devm_kasprintf(dev, GFP_KERNEL,
"%s", name);
return perf_pmu_register(&tx2_pmu->pmu, tx2_pmu->pmu.name, -1);
}
static int tx2_uncore_pmu_add_dev(struct tx2_uncore_pmu *tx2_pmu)
{
int ret, cpu;
cpu = cpumask_any_and(cpumask_of_node(tx2_pmu->node),
cpu_online_mask);
tx2_pmu->cpu = cpu;
hrtimer_init(&tx2_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
tx2_pmu->hrtimer.function = tx2_hrtimer_callback;
ret = tx2_uncore_pmu_register(tx2_pmu);
if (ret) {
dev_err(tx2_pmu->dev, "%s PMU: Failed to init driver\n",
tx2_pmu->name);
return -ENODEV;
}
/* register hotplug callback for the pmu */
ret = cpuhp_state_add_instance(
CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
&tx2_pmu->hpnode);
if (ret) {
dev_err(tx2_pmu->dev, "Error %d registering hotplug", ret);
return ret;
}
/* Add to list */
list_add(&tx2_pmu->entry, &tx2_pmus);
dev_dbg(tx2_pmu->dev, "%s PMU UNCORE registered\n",
tx2_pmu->pmu.name);
return ret;
}
static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
acpi_handle handle, struct acpi_device *adev, u32 type)
{
struct tx2_uncore_pmu *tx2_pmu;
void __iomem *base;
struct resource res;
struct resource_entry *rentry;
struct list_head list;
int ret;
INIT_LIST_HEAD(&list);
ret = acpi_dev_get_resources(adev, &list, NULL, NULL);
if (ret <= 0) {
dev_err(dev, "failed to parse _CRS method, error %d\n", ret);
return NULL;
}
list_for_each_entry(rentry, &list, node) {
if (resource_type(rentry->res) == IORESOURCE_MEM) {
res = *rentry->res;
break;
}
}
if (!rentry->res)
return NULL;
acpi_dev_free_resource_list(&list);
base = devm_ioremap_resource(dev, &res);
if (IS_ERR(base)) {
dev_err(dev, "PMU type %d: Fail to map resource\n", type);
return NULL;
}
tx2_pmu = devm_kzalloc(dev, sizeof(*tx2_pmu), GFP_KERNEL);
if (!tx2_pmu)
return NULL;
tx2_pmu->dev = dev;
tx2_pmu->type = type;
tx2_pmu->base = base;
tx2_pmu->node = dev_to_node(dev);
INIT_LIST_HEAD(&tx2_pmu->entry);
switch (tx2_pmu->type) {
case PMU_TYPE_L3C:
tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
tx2_pmu->prorate_factor = TX2_PMU_L3_TILES;
tx2_pmu->max_events = L3_EVENT_MAX;
tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
tx2_pmu->attr_groups = l3c_pmu_attr_groups;
tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
"uncore_l3c_%d", tx2_pmu->node);
tx2_pmu->init_cntr_base = init_cntr_base_l3c;
tx2_pmu->start_event = uncore_start_event_l3c;
tx2_pmu->stop_event = uncore_stop_event_l3c;
break;
case PMU_TYPE_DMC:
tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
tx2_pmu->max_events = DMC_EVENT_MAX;
tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
tx2_pmu->attr_groups = dmc_pmu_attr_groups;
tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
"uncore_dmc_%d", tx2_pmu->node);
tx2_pmu->init_cntr_base = init_cntr_base_dmc;
tx2_pmu->start_event = uncore_start_event_dmc;
tx2_pmu->stop_event = uncore_stop_event_dmc;
break;
case PMU_TYPE_INVALID:
devm_kfree(dev, tx2_pmu);
return NULL;
}
return tx2_pmu;
}
static acpi_status tx2_uncore_pmu_add(acpi_handle handle, u32 level,
void *data, void **return_value)
{
struct tx2_uncore_pmu *tx2_pmu;
struct acpi_device *adev;
enum tx2_uncore_type type;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (acpi_bus_get_status(adev) || !adev->status.present)
return AE_OK;
type = get_tx2_pmu_type(adev);
if (type == PMU_TYPE_INVALID)
return AE_OK;
tx2_pmu = tx2_uncore_pmu_init_dev((struct device *)data,
handle, adev, type);
if (!tx2_pmu)
return AE_ERROR;
if (tx2_uncore_pmu_add_dev(tx2_pmu)) {
/* Can't add the PMU device, abort */
return AE_ERROR;
}
return AE_OK;
}
static int tx2_uncore_pmu_online_cpu(unsigned int cpu,
struct hlist_node *hpnode)
{
struct tx2_uncore_pmu *tx2_pmu;
tx2_pmu = hlist_entry_safe(hpnode,
struct tx2_uncore_pmu, hpnode);
/* Pick this CPU, If there is no CPU/PMU association and both are
* from same node.
*/
if ((tx2_pmu->cpu >= nr_cpu_ids) &&
(tx2_pmu->node == cpu_to_node(cpu)))
tx2_pmu->cpu = cpu;
return 0;
}
static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
struct hlist_node *hpnode)
{
int new_cpu;
struct tx2_uncore_pmu *tx2_pmu;
struct cpumask cpu_online_mask_temp;
tx2_pmu = hlist_entry_safe(hpnode,
struct tx2_uncore_pmu, hpnode);
if (cpu != tx2_pmu->cpu)
return 0;
hrtimer_cancel(&tx2_pmu->hrtimer);
cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
new_cpu = cpumask_any_and(
cpumask_of_node(tx2_pmu->node),
&cpu_online_mask_temp);
tx2_pmu->cpu = new_cpu;
if (new_cpu >= nr_cpu_ids)
return 0;
perf_pmu_migrate_context(&tx2_pmu->pmu, cpu, new_cpu);
return 0;
}
static const struct acpi_device_id tx2_uncore_acpi_match[] = {
{"CAV901C", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, tx2_uncore_acpi_match);
static int tx2_uncore_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
acpi_handle handle;
acpi_status status;
set_dev_node(dev, acpi_get_node(ACPI_HANDLE(dev)));
if (!has_acpi_companion(dev))
return -ENODEV;
handle = ACPI_HANDLE(dev);
if (!handle)
return -EINVAL;
/* Walk through the tree for all PMU UNCORE devices */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
tx2_uncore_pmu_add,
NULL, dev, NULL);
if (ACPI_FAILURE(status)) {
dev_err(dev, "failed to probe PMU devices\n");
return_ACPI_STATUS(status);
}
dev_info(dev, "node%d: pmu uncore registered\n", dev_to_node(dev));
return 0;
}
static int tx2_uncore_remove(struct platform_device *pdev)
{
struct tx2_uncore_pmu *tx2_pmu, *temp;
struct device *dev = &pdev->dev;
if (!list_empty(&tx2_pmus)) {
list_for_each_entry_safe(tx2_pmu, temp, &tx2_pmus, entry) {
if (tx2_pmu->node == dev_to_node(dev)) {
cpuhp_state_remove_instance_nocalls(
CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
&tx2_pmu->hpnode);
perf_pmu_unregister(&tx2_pmu->pmu);
list_del(&tx2_pmu->entry);
}
}
}
return 0;
}
static struct platform_driver tx2_uncore_driver = {
.driver = {
.name = "tx2-uncore-pmu",
.acpi_match_table = ACPI_PTR(tx2_uncore_acpi_match),
},
.probe = tx2_uncore_probe,
.remove = tx2_uncore_remove,
};
static int __init tx2_uncore_driver_init(void)
{
int ret;
ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
"perf/tx2/uncore:online",
tx2_uncore_pmu_online_cpu,
tx2_uncore_pmu_offline_cpu);
if (ret) {
pr_err("TX2 PMU: setup hotplug failed(%d)\n", ret);
return ret;
}
ret = platform_driver_register(&tx2_uncore_driver);
if (ret)
cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
return ret;
}
module_init(tx2_uncore_driver_init);
static void __exit tx2_uncore_driver_exit(void)
{
platform_driver_unregister(&tx2_uncore_driver);
cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
}
module_exit(tx2_uncore_driver_exit);
MODULE_DESCRIPTION("ThunderX2 UNCORE PMU driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ganapatrao Kulkarni <gkulkarni@cavium.com>");