Commit 21bdbb71 authored by Neil Leeder's avatar Neil Leeder Committed by Will Deacon

perf: add qcom l2 cache perf events driver

Adds perf events support for L2 cache PMU.

The L2 cache PMU driver is named 'l2cache_0' and can be used
with perf events to profile L2 events such as cache hits
and misses on Qualcomm Technologies processors.
Reviewed-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarNeil Leeder <nleeder@codeaurora.org>
[will: minimise nesting in l2_cache_associate_cpu_with_cluster]
[will: use kstrtoul for unsigned long, remove redunant .owner setting]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent fe0a7ef7
Qualcomm Technologies Level-2 Cache Performance Monitoring Unit (PMU)
=====================================================================
This driver supports the L2 cache clusters found in Qualcomm Technologies
Centriq SoCs. There are multiple physical L2 cache clusters, each with their
own PMU. Each cluster has one or more CPUs associated with it.
There is one logical L2 PMU exposed, which aggregates the results from
the physical PMUs.
The driver provides a description of its available events and configuration
options in sysfs, see /sys/devices/l2cache_0.
The "format" directory describes the format of the events.
Events can be envisioned as a 2-dimensional array. Each column represents
a group of events. There are 8 groups. Only one entry from each
group can be in use at a time. If multiple events from the same group
are specified, the conflicting events cannot be counted at the same time.
Events are specified as 0xCCG, where CC is 2 hex digits specifying
the code (array row) and G specifies the group (column) 0-7.
In addition there is a cycle counter event specified by the value 0xFE
which is outside the above scheme.
The driver provides a "cpumask" sysfs attribute which contains a mask
consisting of one CPU per cluster which will be used to handle all the PMU
events on that cluster.
Examples for use with perf:
perf stat -e l2cache_0/config=0x001/,l2cache_0/config=0x042/ -a sleep 1
perf stat -e l2cache_0/config=0xfe/ -C 2 sleep 1
The driver does not support sampling, therefore "perf record" will
not work. Per-task perf sessions are not supported.
...@@ -12,6 +12,15 @@ config ARM_PMU ...@@ -12,6 +12,15 @@ config ARM_PMU
Say y if you want to use CPU performance monitors on ARM-based Say y if you want to use CPU performance monitors on ARM-based
systems. systems.
config QCOM_L2_PMU
bool "Qualcomm Technologies L2-cache PMU"
depends on ARCH_QCOM && ARM64 && PERF_EVENTS && ACPI
help
Provides support for the L2 cache performance monitor unit (PMU)
in Qualcomm Technologies processors.
Adds the L2 cache PMU into the perf events subsystem for
monitoring L2 cache events.
config XGENE_PMU config XGENE_PMU
depends on PERF_EVENTS && ARCH_XGENE depends on PERF_EVENTS && ARCH_XGENE
bool "APM X-Gene SoC PMU" bool "APM X-Gene SoC PMU"
......
obj-$(CONFIG_ARM_PMU) += arm_pmu.o obj-$(CONFIG_ARM_PMU) += arm_pmu.o
obj-$(CONFIG_QCOM_L2_PMU) += qcom_l2_pmu.o
obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
/* Copyright (c) 2015-2017 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*/
#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/cpuhotplug.h>
#include <linux/cpumask.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/percpu.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <asm/barrier.h>
#include <asm/local64.h>
#include <asm/sysreg.h>
#define MAX_L2_CTRS 9
#define L2PMCR_NUM_EV_SHIFT 11
#define L2PMCR_NUM_EV_MASK 0x1F
#define L2PMCR 0x400
#define L2PMCNTENCLR 0x403
#define L2PMCNTENSET 0x404
#define L2PMINTENCLR 0x405
#define L2PMINTENSET 0x406
#define L2PMOVSCLR 0x407
#define L2PMOVSSET 0x408
#define L2PMCCNTCR 0x409
#define L2PMCCNTR 0x40A
#define L2PMCCNTSR 0x40C
#define L2PMRESR 0x410
#define IA_L2PMXEVCNTCR_BASE 0x420
#define IA_L2PMXEVCNTR_BASE 0x421
#define IA_L2PMXEVFILTER_BASE 0x423
#define IA_L2PMXEVTYPER_BASE 0x424
#define IA_L2_REG_OFFSET 0x10
#define L2PMXEVFILTER_SUFILTER_ALL 0x000E0000
#define L2PMXEVFILTER_ORGFILTER_IDINDEP 0x00000004
#define L2PMXEVFILTER_ORGFILTER_ALL 0x00000003
#define L2EVTYPER_REG_SHIFT 3
#define L2PMRESR_GROUP_BITS 8
#define L2PMRESR_GROUP_MASK GENMASK(7, 0)
#define L2CYCLE_CTR_BIT 31
#define L2CYCLE_CTR_RAW_CODE 0xFE
#define L2PMCR_RESET_ALL 0x6
#define L2PMCR_COUNTERS_ENABLE 0x1
#define L2PMCR_COUNTERS_DISABLE 0x0
#define L2PMRESR_EN BIT_ULL(63)
#define L2_EVT_MASK 0x00000FFF
#define L2_EVT_CODE_MASK 0x00000FF0
#define L2_EVT_GRP_MASK 0x0000000F
#define L2_EVT_CODE_SHIFT 4
#define L2_EVT_GRP_SHIFT 0
#define L2_EVT_CODE(event) (((event) & L2_EVT_CODE_MASK) >> L2_EVT_CODE_SHIFT)
#define L2_EVT_GROUP(event) (((event) & L2_EVT_GRP_MASK) >> L2_EVT_GRP_SHIFT)
#define L2_EVT_GROUP_MAX 7
#define L2_COUNTER_RELOAD BIT_ULL(31)
#define L2_CYCLE_COUNTER_RELOAD BIT_ULL(63)
#define L2CPUSRSELR_EL1 sys_reg(3, 3, 15, 0, 6)
#define L2CPUSRDR_EL1 sys_reg(3, 3, 15, 0, 7)
#define reg_idx(reg, i) (((i) * IA_L2_REG_OFFSET) + reg##_BASE)
static DEFINE_RAW_SPINLOCK(l2_access_lock);
/**
* set_l2_indirect_reg: write value to an L2 register
* @reg: Address of L2 register.
* @value: Value to be written to register.
*
* Use architecturally required barriers for ordering between system register
* accesses
*/
static void set_l2_indirect_reg(u64 reg, u64 val)
{
unsigned long flags;
raw_spin_lock_irqsave(&l2_access_lock, flags);
write_sysreg_s(reg, L2CPUSRSELR_EL1);
isb();
write_sysreg_s(val, L2CPUSRDR_EL1);
isb();
raw_spin_unlock_irqrestore(&l2_access_lock, flags);
}
/**
* get_l2_indirect_reg: read an L2 register value
* @reg: Address of L2 register.
*
* Use architecturally required barriers for ordering between system register
* accesses
*/
static u64 get_l2_indirect_reg(u64 reg)
{
u64 val;
unsigned long flags;
raw_spin_lock_irqsave(&l2_access_lock, flags);
write_sysreg_s(reg, L2CPUSRSELR_EL1);
isb();
val = read_sysreg_s(L2CPUSRDR_EL1);
raw_spin_unlock_irqrestore(&l2_access_lock, flags);
return val;
}
struct cluster_pmu;
/*
* Aggregate PMU. Implements the core pmu functions and manages
* the hardware PMUs.
*/
struct l2cache_pmu {
struct hlist_node node;
u32 num_pmus;
struct pmu pmu;
int num_counters;
cpumask_t cpumask;
struct platform_device *pdev;
struct cluster_pmu * __percpu *pmu_cluster;
struct list_head clusters;
};
/*
* The cache is made up of one or more clusters, each cluster has its own PMU.
* Each cluster is associated with one or more CPUs.
* This structure represents one of the hardware PMUs.
*
* Events can be envisioned as a 2-dimensional array. Each column represents
* a group of events. There are 8 groups. Only one entry from each
* group can be in use at a time.
*
* Events are specified as 0xCCG, where CC is 2 hex digits specifying
* the code (array row) and G specifies the group (column).
*
* In addition there is a cycle counter event specified by L2CYCLE_CTR_RAW_CODE
* which is outside the above scheme.
*/
struct cluster_pmu {
struct list_head next;
struct perf_event *events[MAX_L2_CTRS];
struct l2cache_pmu *l2cache_pmu;
DECLARE_BITMAP(used_counters, MAX_L2_CTRS);
DECLARE_BITMAP(used_groups, L2_EVT_GROUP_MAX + 1);
int irq;
int cluster_id;
/* The CPU that is used for collecting events on this cluster */
int on_cpu;
/* All the CPUs associated with this cluster */
cpumask_t cluster_cpus;
spinlock_t pmu_lock;
};
#define to_l2cache_pmu(p) (container_of(p, struct l2cache_pmu, pmu))
static u32 l2_cycle_ctr_idx;
static u32 l2_counter_present_mask;
static inline u32 idx_to_reg_bit(u32 idx)
{
if (idx == l2_cycle_ctr_idx)
return BIT(L2CYCLE_CTR_BIT);
return BIT(idx);
}
static inline struct cluster_pmu *get_cluster_pmu(
struct l2cache_pmu *l2cache_pmu, int cpu)
{
return *per_cpu_ptr(l2cache_pmu->pmu_cluster, cpu);
}
static void cluster_pmu_reset(void)
{
/* Reset all counters */
set_l2_indirect_reg(L2PMCR, L2PMCR_RESET_ALL);
set_l2_indirect_reg(L2PMCNTENCLR, l2_counter_present_mask);
set_l2_indirect_reg(L2PMINTENCLR, l2_counter_present_mask);
set_l2_indirect_reg(L2PMOVSCLR, l2_counter_present_mask);
}
static inline void cluster_pmu_enable(void)
{
set_l2_indirect_reg(L2PMCR, L2PMCR_COUNTERS_ENABLE);
}
static inline void cluster_pmu_disable(void)
{
set_l2_indirect_reg(L2PMCR, L2PMCR_COUNTERS_DISABLE);
}
static inline void cluster_pmu_counter_set_value(u32 idx, u64 value)
{
if (idx == l2_cycle_ctr_idx)
set_l2_indirect_reg(L2PMCCNTR, value);
else
set_l2_indirect_reg(reg_idx(IA_L2PMXEVCNTR, idx), value);
}
static inline u64 cluster_pmu_counter_get_value(u32 idx)
{
u64 value;
if (idx == l2_cycle_ctr_idx)
value = get_l2_indirect_reg(L2PMCCNTR);
else
value = get_l2_indirect_reg(reg_idx(IA_L2PMXEVCNTR, idx));
return value;
}
static inline void cluster_pmu_counter_enable(u32 idx)
{
set_l2_indirect_reg(L2PMCNTENSET, idx_to_reg_bit(idx));
}
static inline void cluster_pmu_counter_disable(u32 idx)
{
set_l2_indirect_reg(L2PMCNTENCLR, idx_to_reg_bit(idx));
}
static inline void cluster_pmu_counter_enable_interrupt(u32 idx)
{
set_l2_indirect_reg(L2PMINTENSET, idx_to_reg_bit(idx));
}
static inline void cluster_pmu_counter_disable_interrupt(u32 idx)
{
set_l2_indirect_reg(L2PMINTENCLR, idx_to_reg_bit(idx));
}
static inline void cluster_pmu_set_evccntcr(u32 val)
{
set_l2_indirect_reg(L2PMCCNTCR, val);
}
static inline void cluster_pmu_set_evcntcr(u32 ctr, u32 val)
{
set_l2_indirect_reg(reg_idx(IA_L2PMXEVCNTCR, ctr), val);
}
static inline void cluster_pmu_set_evtyper(u32 ctr, u32 val)
{
set_l2_indirect_reg(reg_idx(IA_L2PMXEVTYPER, ctr), val);
}
static void cluster_pmu_set_resr(struct cluster_pmu *cluster,
u32 event_group, u32 event_cc)
{
u64 field;
u64 resr_val;
u32 shift;
unsigned long flags;
shift = L2PMRESR_GROUP_BITS * event_group;
field = ((u64)(event_cc & L2PMRESR_GROUP_MASK) << shift);
spin_lock_irqsave(&cluster->pmu_lock, flags);
resr_val = get_l2_indirect_reg(L2PMRESR);
resr_val &= ~(L2PMRESR_GROUP_MASK << shift);
resr_val |= field;
resr_val |= L2PMRESR_EN;
set_l2_indirect_reg(L2PMRESR, resr_val);
spin_unlock_irqrestore(&cluster->pmu_lock, flags);
}
/*
* Hardware allows filtering of events based on the originating
* CPU. Turn this off by setting filter bits to allow events from
* all CPUS, subunits and ID independent events in this cluster.
*/
static inline void cluster_pmu_set_evfilter_sys_mode(u32 ctr)
{
u32 val = L2PMXEVFILTER_SUFILTER_ALL |
L2PMXEVFILTER_ORGFILTER_IDINDEP |
L2PMXEVFILTER_ORGFILTER_ALL;
set_l2_indirect_reg(reg_idx(IA_L2PMXEVFILTER, ctr), val);
}
static inline u32 cluster_pmu_getreset_ovsr(void)
{
u32 result = get_l2_indirect_reg(L2PMOVSSET);
set_l2_indirect_reg(L2PMOVSCLR, result);
return result;
}
static inline bool cluster_pmu_has_overflowed(u32 ovsr)
{
return !!(ovsr & l2_counter_present_mask);
}
static inline bool cluster_pmu_counter_has_overflowed(u32 ovsr, u32 idx)
{
return !!(ovsr & idx_to_reg_bit(idx));
}
static void l2_cache_event_update(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
u64 delta, prev, now;
u32 idx = hwc->idx;
do {
prev = local64_read(&hwc->prev_count);
now = cluster_pmu_counter_get_value(idx);
} while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev);
/*
* The cycle counter is 64-bit, but all other counters are
* 32-bit, and we must handle 32-bit overflow explicitly.
*/
delta = now - prev;
if (idx != l2_cycle_ctr_idx)
delta &= 0xffffffff;
local64_add(delta, &event->count);
}
static void l2_cache_cluster_set_period(struct cluster_pmu *cluster,
struct hw_perf_event *hwc)
{
u32 idx = hwc->idx;
u64 new;
/*
* We limit the max period to half the max counter value so
* that even in the case of extreme interrupt latency the
* counter will (hopefully) not wrap past its initial value.
*/
if (idx == l2_cycle_ctr_idx)
new = L2_CYCLE_COUNTER_RELOAD;
else
new = L2_COUNTER_RELOAD;
local64_set(&hwc->prev_count, new);
cluster_pmu_counter_set_value(idx, new);
}
static int l2_cache_get_event_idx(struct cluster_pmu *cluster,
struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int idx;
int num_ctrs = cluster->l2cache_pmu->num_counters - 1;
unsigned int group;
if (hwc->config_base == L2CYCLE_CTR_RAW_CODE) {
if (test_and_set_bit(l2_cycle_ctr_idx, cluster->used_counters))
return -EAGAIN;
return l2_cycle_ctr_idx;
}
idx = find_first_zero_bit(cluster->used_counters, num_ctrs);
if (idx == num_ctrs)
/* The counters are all in use. */
return -EAGAIN;
/*
* Check for column exclusion: event column already in use by another
* event. This is for events which are not in the same group.
* Conflicting events in the same group are detected in event_init.
*/
group = L2_EVT_GROUP(hwc->config_base);
if (test_bit(group, cluster->used_groups))
return -EAGAIN;
set_bit(idx, cluster->used_counters);
set_bit(group, cluster->used_groups);
return idx;
}
static void l2_cache_clear_event_idx(struct cluster_pmu *cluster,
struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
clear_bit(idx, cluster->used_counters);
if (hwc->config_base != L2CYCLE_CTR_RAW_CODE)
clear_bit(L2_EVT_GROUP(hwc->config_base), cluster->used_groups);
}
static irqreturn_t l2_cache_handle_irq(int irq_num, void *data)
{
struct cluster_pmu *cluster = data;
int num_counters = cluster->l2cache_pmu->num_counters;
u32 ovsr;
int idx;
ovsr = cluster_pmu_getreset_ovsr();
if (!cluster_pmu_has_overflowed(ovsr))
return IRQ_NONE;
for_each_set_bit(idx, cluster->used_counters, num_counters) {
struct perf_event *event = cluster->events[idx];
struct hw_perf_event *hwc;
if (WARN_ON_ONCE(!event))
continue;
if (!cluster_pmu_counter_has_overflowed(ovsr, idx))
continue;
l2_cache_event_update(event);
hwc = &event->hw;
l2_cache_cluster_set_period(cluster, hwc);
}
return IRQ_HANDLED;
}
/*
* Implementation of abstract pmu functionality required by
* the core perf events code.
*/
static void l2_cache_pmu_enable(struct pmu *pmu)
{
/*
* Although there is only one PMU (per socket) controlling multiple
* physical PMUs (per cluster), because we do not support per-task mode
* each event is associated with a CPU. Each event has pmu_enable
* called on its CPU, so here it is only necessary to enable the
* counters for the current CPU.
*/
cluster_pmu_enable();
}
static void l2_cache_pmu_disable(struct pmu *pmu)
{
cluster_pmu_disable();
}
static int l2_cache_event_init(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
struct cluster_pmu *cluster;
struct perf_event *sibling;
struct l2cache_pmu *l2cache_pmu;
if (event->attr.type != event->pmu->type)
return -ENOENT;
l2cache_pmu = to_l2cache_pmu(event->pmu);
if (hwc->sample_period) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Sampling not supported\n");
return -EOPNOTSUPP;
}
if (event->cpu < 0) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Per-task mode not supported\n");
return -EOPNOTSUPP;
}
/* We cannot filter accurately so we just don't allow it. */
if (event->attr.exclude_user || event->attr.exclude_kernel ||
event->attr.exclude_hv || event->attr.exclude_idle) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Can't exclude execution levels\n");
return -EOPNOTSUPP;
}
if (((L2_EVT_GROUP(event->attr.config) > L2_EVT_GROUP_MAX) ||
((event->attr.config & ~L2_EVT_MASK) != 0)) &&
(event->attr.config != L2CYCLE_CTR_RAW_CODE)) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Invalid config %llx\n",
event->attr.config);
return -EINVAL;
}
/* Don't allow groups with mixed PMUs, except for s/w events */
if (event->group_leader->pmu != event->pmu &&
!is_software_event(event->group_leader)) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Can't create mixed PMU group\n");
return -EINVAL;
}
list_for_each_entry(sibling, &event->group_leader->sibling_list,
group_entry)
if (sibling->pmu != event->pmu &&
!is_software_event(sibling)) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Can't create mixed PMU group\n");
return -EINVAL;
}
cluster = get_cluster_pmu(l2cache_pmu, event->cpu);
if (!cluster) {
/* CPU has not been initialised */
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"CPU%d not associated with L2 cluster\n", event->cpu);
return -EINVAL;
}
/* Ensure all events in a group are on the same cpu */
if ((event->group_leader != event) &&
(cluster->on_cpu != event->group_leader->cpu)) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Can't create group on CPUs %d and %d",
event->cpu, event->group_leader->cpu);
return -EINVAL;
}
if ((event != event->group_leader) &&
(L2_EVT_GROUP(event->group_leader->attr.config) ==
L2_EVT_GROUP(event->attr.config))) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Column exclusion: conflicting events %llx %llx\n",
event->group_leader->attr.config,
event->attr.config);
return -EINVAL;
}
list_for_each_entry(sibling, &event->group_leader->sibling_list,
group_entry) {
if ((sibling != event) &&
(L2_EVT_GROUP(sibling->attr.config) ==
L2_EVT_GROUP(event->attr.config))) {
dev_dbg_ratelimited(&l2cache_pmu->pdev->dev,
"Column exclusion: conflicting events %llx %llx\n",
sibling->attr.config,
event->attr.config);
return -EINVAL;
}
}
hwc->idx = -1;
hwc->config_base = event->attr.config;
/*
* Ensure all events are on the same cpu so all events are in the
* same cpu context, to avoid races on pmu_enable etc.
*/
event->cpu = cluster->on_cpu;
return 0;
}
static void l2_cache_event_start(struct perf_event *event, int flags)
{
struct cluster_pmu *cluster;
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
u32 config;
u32 event_cc, event_group;
hwc->state = 0;
cluster = get_cluster_pmu(to_l2cache_pmu(event->pmu), event->cpu);
l2_cache_cluster_set_period(cluster, hwc);
if (hwc->config_base == L2CYCLE_CTR_RAW_CODE) {
cluster_pmu_set_evccntcr(0);
} else {
config = hwc->config_base;
event_cc = L2_EVT_CODE(config);
event_group = L2_EVT_GROUP(config);
cluster_pmu_set_evcntcr(idx, 0);
cluster_pmu_set_evtyper(idx, event_group);
cluster_pmu_set_resr(cluster, event_group, event_cc);
cluster_pmu_set_evfilter_sys_mode(idx);
}
cluster_pmu_counter_enable_interrupt(idx);
cluster_pmu_counter_enable(idx);
}
static void l2_cache_event_stop(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
if (hwc->state & PERF_HES_STOPPED)
return;
cluster_pmu_counter_disable_interrupt(idx);
cluster_pmu_counter_disable(idx);
if (flags & PERF_EF_UPDATE)
l2_cache_event_update(event);
hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
}
static int l2_cache_event_add(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
int idx;
int err = 0;
struct cluster_pmu *cluster;
cluster = get_cluster_pmu(to_l2cache_pmu(event->pmu), event->cpu);
idx = l2_cache_get_event_idx(cluster, event);
if (idx < 0)
return idx;
hwc->idx = idx;
hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
cluster->events[idx] = event;
local64_set(&hwc->prev_count, 0);
if (flags & PERF_EF_START)
l2_cache_event_start(event, flags);
/* Propagate changes to the userspace mapping. */
perf_event_update_userpage(event);
return err;
}
static void l2_cache_event_del(struct perf_event *event, int flags)
{
struct hw_perf_event *hwc = &event->hw;
struct cluster_pmu *cluster;
int idx = hwc->idx;
cluster = get_cluster_pmu(to_l2cache_pmu(event->pmu), event->cpu);
l2_cache_event_stop(event, flags | PERF_EF_UPDATE);
cluster->events[idx] = NULL;
l2_cache_clear_event_idx(cluster, event);
perf_event_update_userpage(event);
}
static void l2_cache_event_read(struct perf_event *event)
{
l2_cache_event_update(event);
}
static ssize_t l2_cache_pmu_cpumask_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct l2cache_pmu *l2cache_pmu = to_l2cache_pmu(dev_get_drvdata(dev));
return cpumap_print_to_pagebuf(true, buf, &l2cache_pmu->cpumask);
}
static struct device_attribute l2_cache_pmu_cpumask_attr =
__ATTR(cpumask, S_IRUGO, l2_cache_pmu_cpumask_show, NULL);
static struct attribute *l2_cache_pmu_cpumask_attrs[] = {
&l2_cache_pmu_cpumask_attr.attr,
NULL,
};
static struct attribute_group l2_cache_pmu_cpumask_group = {
.attrs = l2_cache_pmu_cpumask_attrs,
};
/* CCG format for perf RAW codes. */
PMU_FORMAT_ATTR(l2_code, "config:4-11");
PMU_FORMAT_ATTR(l2_group, "config:0-3");
static struct attribute *l2_cache_pmu_formats[] = {
&format_attr_l2_code.attr,
&format_attr_l2_group.attr,
NULL,
};
static struct attribute_group l2_cache_pmu_format_group = {
.name = "format",
.attrs = l2_cache_pmu_formats,
};
static const struct attribute_group *l2_cache_pmu_attr_grps[] = {
&l2_cache_pmu_format_group,
&l2_cache_pmu_cpumask_group,
NULL,
};
/*
* Generic device handlers
*/
static const struct acpi_device_id l2_cache_pmu_acpi_match[] = {
{ "QCOM8130", },
{ }
};
static int get_num_counters(void)
{
int val;
val = get_l2_indirect_reg(L2PMCR);
/*
* Read number of counters from L2PMCR and add 1
* for the cycle counter.
*/
return ((val >> L2PMCR_NUM_EV_SHIFT) & L2PMCR_NUM_EV_MASK) + 1;
}
static struct cluster_pmu *l2_cache_associate_cpu_with_cluster(
struct l2cache_pmu *l2cache_pmu, int cpu)
{
u64 mpidr;
int cpu_cluster_id;
struct cluster_pmu *cluster = NULL;
/*
* This assumes that the cluster_id is in MPIDR[aff1] for
* single-threaded cores, and MPIDR[aff2] for multi-threaded
* cores. This logic will have to be updated if this changes.
*/
mpidr = read_cpuid_mpidr();
if (mpidr & MPIDR_MT_BITMASK)
cpu_cluster_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
else
cpu_cluster_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
list_for_each_entry(cluster, &l2cache_pmu->clusters, next) {
if (cluster->cluster_id != cpu_cluster_id)
continue;
dev_info(&l2cache_pmu->pdev->dev,
"CPU%d associated with cluster %d\n", cpu,
cluster->cluster_id);
cpumask_set_cpu(cpu, &cluster->cluster_cpus);
*per_cpu_ptr(l2cache_pmu->pmu_cluster, cpu) = cluster;
break;
}
return cluster;
}
static int l2cache_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
{
struct cluster_pmu *cluster;
struct l2cache_pmu *l2cache_pmu;
l2cache_pmu = hlist_entry_safe(node, struct l2cache_pmu, node);
cluster = get_cluster_pmu(l2cache_pmu, cpu);
if (!cluster) {
/* First time this CPU has come online */
cluster = l2_cache_associate_cpu_with_cluster(l2cache_pmu, cpu);
if (!cluster) {
/* Only if broken firmware doesn't list every cluster */
WARN_ONCE(1, "No L2 cache cluster for CPU%d\n", cpu);
return 0;
}
}
/* If another CPU is managing this cluster, we're done */
if (cluster->on_cpu != -1)
return 0;
/*
* All CPUs on this cluster were down, use this one.
* Reset to put it into sane state.
*/
cluster->on_cpu = cpu;
cpumask_set_cpu(cpu, &l2cache_pmu->cpumask);
cluster_pmu_reset();
WARN_ON(irq_set_affinity(cluster->irq, cpumask_of(cpu)));
enable_irq(cluster->irq);
return 0;
}
static int l2cache_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
{
struct cluster_pmu *cluster;
struct l2cache_pmu *l2cache_pmu;
cpumask_t cluster_online_cpus;
unsigned int target;
l2cache_pmu = hlist_entry_safe(node, struct l2cache_pmu, node);
cluster = get_cluster_pmu(l2cache_pmu, cpu);
if (!cluster)
return 0;
/* If this CPU is not managing the cluster, we're done */
if (cluster->on_cpu != cpu)
return 0;
/* Give up ownership of cluster */
cpumask_clear_cpu(cpu, &l2cache_pmu->cpumask);
cluster->on_cpu = -1;
/* Any other CPU for this cluster which is still online */
cpumask_and(&cluster_online_cpus, &cluster->cluster_cpus,
cpu_online_mask);
target = cpumask_any_but(&cluster_online_cpus, cpu);
if (target >= nr_cpu_ids) {
disable_irq(cluster->irq);
return 0;
}
perf_pmu_migrate_context(&l2cache_pmu->pmu, cpu, target);
cluster->on_cpu = target;
cpumask_set_cpu(target, &l2cache_pmu->cpumask);
WARN_ON(irq_set_affinity(cluster->irq, cpumask_of(target)));
return 0;
}
static int l2_cache_pmu_probe_cluster(struct device *dev, void *data)
{
struct platform_device *pdev = to_platform_device(dev->parent);
struct platform_device *sdev = to_platform_device(dev);
struct l2cache_pmu *l2cache_pmu = data;
struct cluster_pmu *cluster;
struct acpi_device *device;
unsigned long fw_cluster_id;
int err;
int irq;
if (acpi_bus_get_device(ACPI_HANDLE(dev), &device))
return -ENODEV;
if (kstrtoul(device->pnp.unique_id, 10, &fw_cluster_id) < 0) {
dev_err(&pdev->dev, "unable to read ACPI uid\n");
return -ENODEV;
}
cluster = devm_kzalloc(&pdev->dev, sizeof(*cluster), GFP_KERNEL);
if (!cluster)
return -ENOMEM;
INIT_LIST_HEAD(&cluster->next);
list_add(&cluster->next, &l2cache_pmu->clusters);
cluster->cluster_id = fw_cluster_id;
irq = platform_get_irq(sdev, 0);
if (irq < 0) {
dev_err(&pdev->dev,
"Failed to get valid irq for cluster %ld\n",
fw_cluster_id);
return irq;
}
irq_set_status_flags(irq, IRQ_NOAUTOEN);
cluster->irq = irq;
cluster->l2cache_pmu = l2cache_pmu;
cluster->on_cpu = -1;
err = devm_request_irq(&pdev->dev, irq, l2_cache_handle_irq,
IRQF_NOBALANCING | IRQF_NO_THREAD,
"l2-cache-pmu", cluster);
if (err) {
dev_err(&pdev->dev,
"Unable to request IRQ%d for L2 PMU counters\n", irq);
return err;
}
dev_info(&pdev->dev,
"Registered L2 cache PMU cluster %ld\n", fw_cluster_id);
spin_lock_init(&cluster->pmu_lock);
l2cache_pmu->num_pmus++;
return 0;
}
static int l2_cache_pmu_probe(struct platform_device *pdev)
{
int err;
struct l2cache_pmu *l2cache_pmu;
l2cache_pmu =
devm_kzalloc(&pdev->dev, sizeof(*l2cache_pmu), GFP_KERNEL);
if (!l2cache_pmu)
return -ENOMEM;
INIT_LIST_HEAD(&l2cache_pmu->clusters);
platform_set_drvdata(pdev, l2cache_pmu);
l2cache_pmu->pmu = (struct pmu) {
/* suffix is instance id for future use with multiple sockets */
.name = "l2cache_0",
.task_ctx_nr = perf_invalid_context,
.pmu_enable = l2_cache_pmu_enable,
.pmu_disable = l2_cache_pmu_disable,
.event_init = l2_cache_event_init,
.add = l2_cache_event_add,
.del = l2_cache_event_del,
.start = l2_cache_event_start,
.stop = l2_cache_event_stop,
.read = l2_cache_event_read,
.attr_groups = l2_cache_pmu_attr_grps,
};
l2cache_pmu->num_counters = get_num_counters();
l2cache_pmu->pdev = pdev;
l2cache_pmu->pmu_cluster = devm_alloc_percpu(&pdev->dev,
struct cluster_pmu *);
if (!l2cache_pmu->pmu_cluster)
return -ENOMEM;
l2_cycle_ctr_idx = l2cache_pmu->num_counters - 1;
l2_counter_present_mask = GENMASK(l2cache_pmu->num_counters - 2, 0) |
BIT(L2CYCLE_CTR_BIT);
cpumask_clear(&l2cache_pmu->cpumask);
/* Read cluster info and initialize each cluster */
err = device_for_each_child(&pdev->dev, l2cache_pmu,
l2_cache_pmu_probe_cluster);
if (err)
return err;
if (l2cache_pmu->num_pmus == 0) {
dev_err(&pdev->dev, "No hardware L2 cache PMUs found\n");
return -ENODEV;
}
err = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
&l2cache_pmu->node);
if (err) {
dev_err(&pdev->dev, "Error %d registering hotplug", err);
return err;
}
err = perf_pmu_register(&l2cache_pmu->pmu, l2cache_pmu->pmu.name, -1);
if (err) {
dev_err(&pdev->dev, "Error %d registering L2 cache PMU\n", err);
goto out_unregister;
}
dev_info(&pdev->dev, "Registered L2 cache PMU using %d HW PMUs\n",
l2cache_pmu->num_pmus);
return err;
out_unregister:
cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
&l2cache_pmu->node);
return err;
}
static int l2_cache_pmu_remove(struct platform_device *pdev)
{
struct l2cache_pmu *l2cache_pmu =
to_l2cache_pmu(platform_get_drvdata(pdev));
perf_pmu_unregister(&l2cache_pmu->pmu);
cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
&l2cache_pmu->node);
return 0;
}
static struct platform_driver l2_cache_pmu_driver = {
.driver = {
.name = "qcom-l2cache-pmu",
.acpi_match_table = ACPI_PTR(l2_cache_pmu_acpi_match),
},
.probe = l2_cache_pmu_probe,
.remove = l2_cache_pmu_remove,
};
static int __init register_l2_cache_pmu_driver(void)
{
int err;
err = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
"AP_PERF_ARM_QCOM_L2_ONLINE",
l2cache_pmu_online_cpu,
l2cache_pmu_offline_cpu);
if (err)
return err;
return platform_driver_register(&l2_cache_pmu_driver);
}
device_initcall(register_l2_cache_pmu_driver);
...@@ -138,6 +138,7 @@ enum cpuhp_state { ...@@ -138,6 +138,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_ARM_CCI_ONLINE, CPUHP_AP_PERF_ARM_CCI_ONLINE,
CPUHP_AP_PERF_ARM_CCN_ONLINE, CPUHP_AP_PERF_ARM_CCN_ONLINE,
CPUHP_AP_PERF_ARM_L2X0_ONLINE, CPUHP_AP_PERF_ARM_L2X0_ONLINE,
CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
CPUHP_AP_WORKQUEUE_ONLINE, CPUHP_AP_WORKQUEUE_ONLINE,
CPUHP_AP_RCUTREE_ONLINE, CPUHP_AP_RCUTREE_ONLINE,
CPUHP_AP_ONLINE_DYN, CPUHP_AP_ONLINE_DYN,
......
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