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![Qi Liu](/assets/img/avatar_default.png)
[ Upstream commit f32ed8eb0e
]
Forcefully unbinding PMU drivers during perf sampling will lead to
a kernel panic, because the perf upper-layer framework call a NULL
pointer in this situation.
To solve this issue, "suppress_bind_attrs" should be set to true, so
that bind/unbind can be disabled via sysfs and prevent unbinding PMU
drivers during perf sampling.
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
834 lines
22 KiB
C
834 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ARM DynamIQ Shared Unit (DSU) PMU driver
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*
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* Copyright (C) ARM Limited, 2017.
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*
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* Based on ARM CCI-PMU, ARMv8 PMU-v3 drivers.
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*/
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#define PMUNAME "arm_dsu"
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#define DRVNAME PMUNAME "_pmu"
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#define pr_fmt(fmt) DRVNAME ": " fmt
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#include <linux/bitmap.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/cpumask.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/perf_event.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include <asm/arm_dsu_pmu.h>
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#include <asm/local64.h>
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/* PMU event codes */
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#define DSU_PMU_EVT_CYCLES 0x11
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#define DSU_PMU_EVT_CHAIN 0x1e
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#define DSU_PMU_MAX_COMMON_EVENTS 0x40
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#define DSU_PMU_MAX_HW_CNTRS 32
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#define DSU_PMU_HW_COUNTER_MASK (DSU_PMU_MAX_HW_CNTRS - 1)
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#define CLUSTERPMCR_E BIT(0)
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#define CLUSTERPMCR_P BIT(1)
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#define CLUSTERPMCR_C BIT(2)
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#define CLUSTERPMCR_N_SHIFT 11
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#define CLUSTERPMCR_N_MASK 0x1f
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#define CLUSTERPMCR_IDCODE_SHIFT 16
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#define CLUSTERPMCR_IDCODE_MASK 0xff
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#define CLUSTERPMCR_IMP_SHIFT 24
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#define CLUSTERPMCR_IMP_MASK 0xff
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#define CLUSTERPMCR_RES_MASK 0x7e8
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#define CLUSTERPMCR_RES_VAL 0x40
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#define DSU_ACTIVE_CPU_MASK 0x0
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#define DSU_ASSOCIATED_CPU_MASK 0x1
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/*
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* We use the index of the counters as they appear in the counter
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* bit maps in the PMU registers (e.g CLUSTERPMSELR).
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* i.e,
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* counter 0 - Bit 0
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* counter 1 - Bit 1
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* ...
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* Cycle counter - Bit 31
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*/
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#define DSU_PMU_IDX_CYCLE_COUNTER 31
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/* All event counters are 32bit, with a 64bit Cycle counter */
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#define DSU_PMU_COUNTER_WIDTH(idx) \
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(((idx) == DSU_PMU_IDX_CYCLE_COUNTER) ? 64 : 32)
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#define DSU_PMU_COUNTER_MASK(idx) \
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GENMASK_ULL((DSU_PMU_COUNTER_WIDTH((idx)) - 1), 0)
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#define DSU_EXT_ATTR(_name, _func, _config) \
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(&((struct dev_ext_attribute[]) { \
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{ \
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.attr = __ATTR(_name, 0444, _func, NULL), \
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.var = (void *)_config \
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} \
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})[0].attr.attr)
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#define DSU_EVENT_ATTR(_name, _config) \
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DSU_EXT_ATTR(_name, dsu_pmu_sysfs_event_show, (unsigned long)_config)
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#define DSU_FORMAT_ATTR(_name, _config) \
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DSU_EXT_ATTR(_name, dsu_pmu_sysfs_format_show, (char *)_config)
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#define DSU_CPUMASK_ATTR(_name, _config) \
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DSU_EXT_ATTR(_name, dsu_pmu_cpumask_show, (unsigned long)_config)
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struct dsu_hw_events {
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DECLARE_BITMAP(used_mask, DSU_PMU_MAX_HW_CNTRS);
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struct perf_event *events[DSU_PMU_MAX_HW_CNTRS];
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};
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/*
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* struct dsu_pmu - DSU PMU descriptor
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*
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* @pmu_lock : Protects accesses to DSU PMU register from normal vs
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* interrupt handler contexts.
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* @hw_events : Holds the event counter state.
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* @associated_cpus : CPUs attached to the DSU.
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* @active_cpu : CPU to which the PMU is bound for accesses.
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* @cpuhp_node : Node for CPU hotplug notifier link.
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* @num_counters : Number of event counters implemented by the PMU,
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* excluding the cycle counter.
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* @irq : Interrupt line for counter overflow.
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* @cpmceid_bitmap : Bitmap for the availability of architected common
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* events (event_code < 0x40).
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*/
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struct dsu_pmu {
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struct pmu pmu;
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struct device *dev;
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raw_spinlock_t pmu_lock;
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struct dsu_hw_events hw_events;
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cpumask_t associated_cpus;
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cpumask_t active_cpu;
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struct hlist_node cpuhp_node;
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s8 num_counters;
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int irq;
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DECLARE_BITMAP(cpmceid_bitmap, DSU_PMU_MAX_COMMON_EVENTS);
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};
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static unsigned long dsu_pmu_cpuhp_state;
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static inline struct dsu_pmu *to_dsu_pmu(struct pmu *pmu)
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{
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return container_of(pmu, struct dsu_pmu, pmu);
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}
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static ssize_t dsu_pmu_sysfs_event_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct dev_ext_attribute *eattr = container_of(attr,
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struct dev_ext_attribute, attr);
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return snprintf(buf, PAGE_SIZE, "event=0x%lx\n",
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(unsigned long)eattr->var);
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}
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static ssize_t dsu_pmu_sysfs_format_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct dev_ext_attribute *eattr = container_of(attr,
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struct dev_ext_attribute, attr);
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return snprintf(buf, PAGE_SIZE, "%s\n", (char *)eattr->var);
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}
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static ssize_t dsu_pmu_cpumask_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct pmu *pmu = dev_get_drvdata(dev);
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(pmu);
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struct dev_ext_attribute *eattr = container_of(attr,
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struct dev_ext_attribute, attr);
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unsigned long mask_id = (unsigned long)eattr->var;
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const cpumask_t *cpumask;
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switch (mask_id) {
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case DSU_ACTIVE_CPU_MASK:
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cpumask = &dsu_pmu->active_cpu;
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break;
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case DSU_ASSOCIATED_CPU_MASK:
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cpumask = &dsu_pmu->associated_cpus;
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break;
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default:
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return 0;
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}
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return cpumap_print_to_pagebuf(true, buf, cpumask);
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}
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static struct attribute *dsu_pmu_format_attrs[] = {
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DSU_FORMAT_ATTR(event, "config:0-31"),
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NULL,
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};
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static const struct attribute_group dsu_pmu_format_attr_group = {
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.name = "format",
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.attrs = dsu_pmu_format_attrs,
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};
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static struct attribute *dsu_pmu_event_attrs[] = {
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DSU_EVENT_ATTR(cycles, 0x11),
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DSU_EVENT_ATTR(bus_access, 0x19),
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DSU_EVENT_ATTR(memory_error, 0x1a),
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DSU_EVENT_ATTR(bus_cycles, 0x1d),
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DSU_EVENT_ATTR(l3d_cache_allocate, 0x29),
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DSU_EVENT_ATTR(l3d_cache_refill, 0x2a),
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DSU_EVENT_ATTR(l3d_cache, 0x2b),
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DSU_EVENT_ATTR(l3d_cache_wb, 0x2c),
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NULL,
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};
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static umode_t
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dsu_pmu_event_attr_is_visible(struct kobject *kobj, struct attribute *attr,
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int unused)
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{
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struct pmu *pmu = dev_get_drvdata(kobj_to_dev(kobj));
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(pmu);
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struct dev_ext_attribute *eattr = container_of(attr,
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struct dev_ext_attribute, attr.attr);
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unsigned long evt = (unsigned long)eattr->var;
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return test_bit(evt, dsu_pmu->cpmceid_bitmap) ? attr->mode : 0;
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}
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static const struct attribute_group dsu_pmu_events_attr_group = {
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.name = "events",
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.attrs = dsu_pmu_event_attrs,
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.is_visible = dsu_pmu_event_attr_is_visible,
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};
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static struct attribute *dsu_pmu_cpumask_attrs[] = {
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DSU_CPUMASK_ATTR(cpumask, DSU_ACTIVE_CPU_MASK),
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DSU_CPUMASK_ATTR(associated_cpus, DSU_ASSOCIATED_CPU_MASK),
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NULL,
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};
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static const struct attribute_group dsu_pmu_cpumask_attr_group = {
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.attrs = dsu_pmu_cpumask_attrs,
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};
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static const struct attribute_group *dsu_pmu_attr_groups[] = {
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&dsu_pmu_cpumask_attr_group,
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&dsu_pmu_events_attr_group,
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&dsu_pmu_format_attr_group,
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NULL,
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};
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static int dsu_pmu_get_online_cpu_any_but(struct dsu_pmu *dsu_pmu, int cpu)
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{
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struct cpumask online_supported;
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cpumask_and(&online_supported,
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&dsu_pmu->associated_cpus, cpu_online_mask);
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return cpumask_any_but(&online_supported, cpu);
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}
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static inline bool dsu_pmu_counter_valid(struct dsu_pmu *dsu_pmu, u32 idx)
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{
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return (idx < dsu_pmu->num_counters) ||
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(idx == DSU_PMU_IDX_CYCLE_COUNTER);
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}
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static inline u64 dsu_pmu_read_counter(struct perf_event *event)
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{
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u64 val;
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unsigned long flags;
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
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int idx = event->hw.idx;
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if (WARN_ON(!cpumask_test_cpu(smp_processor_id(),
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&dsu_pmu->associated_cpus)))
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return 0;
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if (!dsu_pmu_counter_valid(dsu_pmu, idx)) {
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dev_err(event->pmu->dev,
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"Trying reading invalid counter %d\n", idx);
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return 0;
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}
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raw_spin_lock_irqsave(&dsu_pmu->pmu_lock, flags);
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if (idx == DSU_PMU_IDX_CYCLE_COUNTER)
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val = __dsu_pmu_read_pmccntr();
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else
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val = __dsu_pmu_read_counter(idx);
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raw_spin_unlock_irqrestore(&dsu_pmu->pmu_lock, flags);
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return val;
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}
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static void dsu_pmu_write_counter(struct perf_event *event, u64 val)
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{
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unsigned long flags;
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
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int idx = event->hw.idx;
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if (WARN_ON(!cpumask_test_cpu(smp_processor_id(),
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&dsu_pmu->associated_cpus)))
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return;
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if (!dsu_pmu_counter_valid(dsu_pmu, idx)) {
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dev_err(event->pmu->dev,
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"writing to invalid counter %d\n", idx);
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return;
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}
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raw_spin_lock_irqsave(&dsu_pmu->pmu_lock, flags);
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if (idx == DSU_PMU_IDX_CYCLE_COUNTER)
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__dsu_pmu_write_pmccntr(val);
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else
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__dsu_pmu_write_counter(idx, val);
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raw_spin_unlock_irqrestore(&dsu_pmu->pmu_lock, flags);
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}
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static int dsu_pmu_get_event_idx(struct dsu_hw_events *hw_events,
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struct perf_event *event)
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{
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int idx;
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unsigned long evtype = event->attr.config;
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
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unsigned long *used_mask = hw_events->used_mask;
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if (evtype == DSU_PMU_EVT_CYCLES) {
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if (test_and_set_bit(DSU_PMU_IDX_CYCLE_COUNTER, used_mask))
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return -EAGAIN;
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return DSU_PMU_IDX_CYCLE_COUNTER;
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}
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idx = find_first_zero_bit(used_mask, dsu_pmu->num_counters);
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if (idx >= dsu_pmu->num_counters)
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return -EAGAIN;
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set_bit(idx, hw_events->used_mask);
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return idx;
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}
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static void dsu_pmu_enable_counter(struct dsu_pmu *dsu_pmu, int idx)
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{
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__dsu_pmu_counter_interrupt_enable(idx);
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__dsu_pmu_enable_counter(idx);
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}
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static void dsu_pmu_disable_counter(struct dsu_pmu *dsu_pmu, int idx)
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{
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__dsu_pmu_disable_counter(idx);
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__dsu_pmu_counter_interrupt_disable(idx);
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}
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static inline void dsu_pmu_set_event(struct dsu_pmu *dsu_pmu,
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struct perf_event *event)
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{
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int idx = event->hw.idx;
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unsigned long flags;
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if (!dsu_pmu_counter_valid(dsu_pmu, idx)) {
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dev_err(event->pmu->dev,
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"Trying to set invalid counter %d\n", idx);
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return;
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}
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raw_spin_lock_irqsave(&dsu_pmu->pmu_lock, flags);
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__dsu_pmu_set_event(idx, event->hw.config_base);
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raw_spin_unlock_irqrestore(&dsu_pmu->pmu_lock, flags);
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}
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static void dsu_pmu_event_update(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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u64 delta, prev_count, new_count;
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do {
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/* We may also be called from the irq handler */
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prev_count = local64_read(&hwc->prev_count);
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new_count = dsu_pmu_read_counter(event);
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} while (local64_cmpxchg(&hwc->prev_count, prev_count, new_count) !=
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prev_count);
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delta = (new_count - prev_count) & DSU_PMU_COUNTER_MASK(hwc->idx);
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local64_add(delta, &event->count);
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}
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static void dsu_pmu_read(struct perf_event *event)
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{
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dsu_pmu_event_update(event);
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}
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static inline u32 dsu_pmu_get_reset_overflow(void)
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{
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return __dsu_pmu_get_reset_overflow();
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}
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/**
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* dsu_pmu_set_event_period: Set the period for the counter.
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*
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* All DSU PMU event counters, except the cycle counter are 32bit
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* counters. To handle cases of extreme interrupt latency, we program
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* the counter with half of the max count for the counters.
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*/
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static void dsu_pmu_set_event_period(struct perf_event *event)
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{
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int idx = event->hw.idx;
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u64 val = DSU_PMU_COUNTER_MASK(idx) >> 1;
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local64_set(&event->hw.prev_count, val);
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dsu_pmu_write_counter(event, val);
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}
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static irqreturn_t dsu_pmu_handle_irq(int irq_num, void *dev)
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{
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int i;
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bool handled = false;
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struct dsu_pmu *dsu_pmu = dev;
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struct dsu_hw_events *hw_events = &dsu_pmu->hw_events;
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unsigned long overflow;
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overflow = dsu_pmu_get_reset_overflow();
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if (!overflow)
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return IRQ_NONE;
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for_each_set_bit(i, &overflow, DSU_PMU_MAX_HW_CNTRS) {
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struct perf_event *event = hw_events->events[i];
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if (!event)
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continue;
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dsu_pmu_event_update(event);
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dsu_pmu_set_event_period(event);
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handled = true;
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}
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return IRQ_RETVAL(handled);
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}
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static void dsu_pmu_start(struct perf_event *event, int pmu_flags)
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{
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
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/* We always reprogram the counter */
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if (pmu_flags & PERF_EF_RELOAD)
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WARN_ON(!(event->hw.state & PERF_HES_UPTODATE));
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dsu_pmu_set_event_period(event);
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if (event->hw.idx != DSU_PMU_IDX_CYCLE_COUNTER)
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dsu_pmu_set_event(dsu_pmu, event);
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event->hw.state = 0;
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dsu_pmu_enable_counter(dsu_pmu, event->hw.idx);
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}
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static void dsu_pmu_stop(struct perf_event *event, int pmu_flags)
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{
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
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if (event->hw.state & PERF_HES_STOPPED)
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return;
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dsu_pmu_disable_counter(dsu_pmu, event->hw.idx);
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dsu_pmu_event_update(event);
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event->hw.state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
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}
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static int dsu_pmu_add(struct perf_event *event, int flags)
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{
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struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
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struct dsu_hw_events *hw_events = &dsu_pmu->hw_events;
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struct hw_perf_event *hwc = &event->hw;
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int idx;
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|
|
|
if (WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(),
|
|
&dsu_pmu->associated_cpus)))
|
|
return -ENOENT;
|
|
|
|
idx = dsu_pmu_get_event_idx(hw_events, event);
|
|
if (idx < 0)
|
|
return idx;
|
|
|
|
hwc->idx = idx;
|
|
hw_events->events[idx] = event;
|
|
hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
|
|
|
|
if (flags & PERF_EF_START)
|
|
dsu_pmu_start(event, PERF_EF_RELOAD);
|
|
|
|
perf_event_update_userpage(event);
|
|
return 0;
|
|
}
|
|
|
|
static void dsu_pmu_del(struct perf_event *event, int flags)
|
|
{
|
|
struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
|
|
struct dsu_hw_events *hw_events = &dsu_pmu->hw_events;
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
int idx = hwc->idx;
|
|
|
|
dsu_pmu_stop(event, PERF_EF_UPDATE);
|
|
hw_events->events[idx] = NULL;
|
|
clear_bit(idx, hw_events->used_mask);
|
|
perf_event_update_userpage(event);
|
|
}
|
|
|
|
static void dsu_pmu_enable(struct pmu *pmu)
|
|
{
|
|
u32 pmcr;
|
|
unsigned long flags;
|
|
struct dsu_pmu *dsu_pmu = to_dsu_pmu(pmu);
|
|
|
|
/* If no counters are added, skip enabling the PMU */
|
|
if (bitmap_empty(dsu_pmu->hw_events.used_mask, DSU_PMU_MAX_HW_CNTRS))
|
|
return;
|
|
|
|
raw_spin_lock_irqsave(&dsu_pmu->pmu_lock, flags);
|
|
pmcr = __dsu_pmu_read_pmcr();
|
|
pmcr |= CLUSTERPMCR_E;
|
|
__dsu_pmu_write_pmcr(pmcr);
|
|
raw_spin_unlock_irqrestore(&dsu_pmu->pmu_lock, flags);
|
|
}
|
|
|
|
static void dsu_pmu_disable(struct pmu *pmu)
|
|
{
|
|
u32 pmcr;
|
|
unsigned long flags;
|
|
struct dsu_pmu *dsu_pmu = to_dsu_pmu(pmu);
|
|
|
|
raw_spin_lock_irqsave(&dsu_pmu->pmu_lock, flags);
|
|
pmcr = __dsu_pmu_read_pmcr();
|
|
pmcr &= ~CLUSTERPMCR_E;
|
|
__dsu_pmu_write_pmcr(pmcr);
|
|
raw_spin_unlock_irqrestore(&dsu_pmu->pmu_lock, flags);
|
|
}
|
|
|
|
static bool dsu_pmu_validate_event(struct pmu *pmu,
|
|
struct dsu_hw_events *hw_events,
|
|
struct perf_event *event)
|
|
{
|
|
if (is_software_event(event))
|
|
return true;
|
|
/* Reject groups spanning multiple HW PMUs. */
|
|
if (event->pmu != pmu)
|
|
return false;
|
|
return dsu_pmu_get_event_idx(hw_events, event) >= 0;
|
|
}
|
|
|
|
/*
|
|
* Make sure the group of events can be scheduled at once
|
|
* on the PMU.
|
|
*/
|
|
static bool dsu_pmu_validate_group(struct perf_event *event)
|
|
{
|
|
struct perf_event *sibling, *leader = event->group_leader;
|
|
struct dsu_hw_events fake_hw;
|
|
|
|
if (event->group_leader == event)
|
|
return true;
|
|
|
|
memset(fake_hw.used_mask, 0, sizeof(fake_hw.used_mask));
|
|
if (!dsu_pmu_validate_event(event->pmu, &fake_hw, leader))
|
|
return false;
|
|
for_each_sibling_event(sibling, leader) {
|
|
if (!dsu_pmu_validate_event(event->pmu, &fake_hw, sibling))
|
|
return false;
|
|
}
|
|
return dsu_pmu_validate_event(event->pmu, &fake_hw, event);
|
|
}
|
|
|
|
static int dsu_pmu_event_init(struct perf_event *event)
|
|
{
|
|
struct dsu_pmu *dsu_pmu = to_dsu_pmu(event->pmu);
|
|
|
|
if (event->attr.type != event->pmu->type)
|
|
return -ENOENT;
|
|
|
|
/* We don't support sampling */
|
|
if (is_sampling_event(event)) {
|
|
dev_dbg(dsu_pmu->pmu.dev, "Can't support sampling events\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/* We cannot support task bound events */
|
|
if (event->cpu < 0 || event->attach_state & PERF_ATTACH_TASK) {
|
|
dev_dbg(dsu_pmu->pmu.dev, "Can't support per-task counters\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (has_branch_stack(event)) {
|
|
dev_dbg(dsu_pmu->pmu.dev, "Can't support filtering\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!cpumask_test_cpu(event->cpu, &dsu_pmu->associated_cpus)) {
|
|
dev_dbg(dsu_pmu->pmu.dev,
|
|
"Requested cpu is not associated with the DSU\n");
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Choose the current active CPU to read the events. We don't want
|
|
* to migrate the event contexts, irq handling etc to the requested
|
|
* CPU. As long as the requested CPU is within the same DSU, we
|
|
* are fine.
|
|
*/
|
|
event->cpu = cpumask_first(&dsu_pmu->active_cpu);
|
|
if (event->cpu >= nr_cpu_ids)
|
|
return -EINVAL;
|
|
if (!dsu_pmu_validate_group(event))
|
|
return -EINVAL;
|
|
|
|
event->hw.config_base = event->attr.config;
|
|
return 0;
|
|
}
|
|
|
|
static struct dsu_pmu *dsu_pmu_alloc(struct platform_device *pdev)
|
|
{
|
|
struct dsu_pmu *dsu_pmu;
|
|
|
|
dsu_pmu = devm_kzalloc(&pdev->dev, sizeof(*dsu_pmu), GFP_KERNEL);
|
|
if (!dsu_pmu)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
raw_spin_lock_init(&dsu_pmu->pmu_lock);
|
|
/*
|
|
* Initialise the number of counters to -1, until we probe
|
|
* the real number on a connected CPU.
|
|
*/
|
|
dsu_pmu->num_counters = -1;
|
|
return dsu_pmu;
|
|
}
|
|
|
|
/**
|
|
* dsu_pmu_dt_get_cpus: Get the list of CPUs in the cluster.
|
|
*/
|
|
static int dsu_pmu_dt_get_cpus(struct device_node *dev, cpumask_t *mask)
|
|
{
|
|
int i = 0, n, cpu;
|
|
struct device_node *cpu_node;
|
|
|
|
n = of_count_phandle_with_args(dev, "cpus", NULL);
|
|
if (n <= 0)
|
|
return -ENODEV;
|
|
for (; i < n; i++) {
|
|
cpu_node = of_parse_phandle(dev, "cpus", i);
|
|
if (!cpu_node)
|
|
break;
|
|
cpu = of_cpu_node_to_id(cpu_node);
|
|
of_node_put(cpu_node);
|
|
/*
|
|
* We have to ignore the failures here and continue scanning
|
|
* the list to handle cases where the nr_cpus could be capped
|
|
* in the running kernel.
|
|
*/
|
|
if (cpu < 0)
|
|
continue;
|
|
cpumask_set_cpu(cpu, mask);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* dsu_pmu_probe_pmu: Probe the PMU details on a CPU in the cluster.
|
|
*/
|
|
static void dsu_pmu_probe_pmu(struct dsu_pmu *dsu_pmu)
|
|
{
|
|
u64 num_counters;
|
|
u32 cpmceid[2];
|
|
|
|
num_counters = (__dsu_pmu_read_pmcr() >> CLUSTERPMCR_N_SHIFT) &
|
|
CLUSTERPMCR_N_MASK;
|
|
/* We can only support up to 31 independent counters */
|
|
if (WARN_ON(num_counters > 31))
|
|
num_counters = 31;
|
|
dsu_pmu->num_counters = num_counters;
|
|
if (!dsu_pmu->num_counters)
|
|
return;
|
|
cpmceid[0] = __dsu_pmu_read_pmceid(0);
|
|
cpmceid[1] = __dsu_pmu_read_pmceid(1);
|
|
bitmap_from_arr32(dsu_pmu->cpmceid_bitmap, cpmceid,
|
|
DSU_PMU_MAX_COMMON_EVENTS);
|
|
}
|
|
|
|
static void dsu_pmu_set_active_cpu(int cpu, struct dsu_pmu *dsu_pmu)
|
|
{
|
|
cpumask_set_cpu(cpu, &dsu_pmu->active_cpu);
|
|
if (irq_set_affinity_hint(dsu_pmu->irq, &dsu_pmu->active_cpu))
|
|
pr_warn("Failed to set irq affinity to %d\n", cpu);
|
|
}
|
|
|
|
/*
|
|
* dsu_pmu_init_pmu: Initialise the DSU PMU configurations if
|
|
* we haven't done it already.
|
|
*/
|
|
static void dsu_pmu_init_pmu(struct dsu_pmu *dsu_pmu)
|
|
{
|
|
if (dsu_pmu->num_counters == -1)
|
|
dsu_pmu_probe_pmu(dsu_pmu);
|
|
/* Reset the interrupt overflow mask */
|
|
dsu_pmu_get_reset_overflow();
|
|
}
|
|
|
|
static int dsu_pmu_device_probe(struct platform_device *pdev)
|
|
{
|
|
int irq, rc;
|
|
struct dsu_pmu *dsu_pmu;
|
|
char *name;
|
|
static atomic_t pmu_idx = ATOMIC_INIT(-1);
|
|
|
|
dsu_pmu = dsu_pmu_alloc(pdev);
|
|
if (IS_ERR(dsu_pmu))
|
|
return PTR_ERR(dsu_pmu);
|
|
|
|
rc = dsu_pmu_dt_get_cpus(pdev->dev.of_node, &dsu_pmu->associated_cpus);
|
|
if (rc) {
|
|
dev_warn(&pdev->dev, "Failed to parse the CPUs\n");
|
|
return rc;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_warn(&pdev->dev, "Failed to find IRQ\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d",
|
|
PMUNAME, atomic_inc_return(&pmu_idx));
|
|
if (!name)
|
|
return -ENOMEM;
|
|
rc = devm_request_irq(&pdev->dev, irq, dsu_pmu_handle_irq,
|
|
IRQF_NOBALANCING, name, dsu_pmu);
|
|
if (rc) {
|
|
dev_warn(&pdev->dev, "Failed to request IRQ %d\n", irq);
|
|
return rc;
|
|
}
|
|
|
|
dsu_pmu->irq = irq;
|
|
platform_set_drvdata(pdev, dsu_pmu);
|
|
rc = cpuhp_state_add_instance(dsu_pmu_cpuhp_state,
|
|
&dsu_pmu->cpuhp_node);
|
|
if (rc)
|
|
return rc;
|
|
|
|
dsu_pmu->pmu = (struct pmu) {
|
|
.task_ctx_nr = perf_invalid_context,
|
|
.module = THIS_MODULE,
|
|
.pmu_enable = dsu_pmu_enable,
|
|
.pmu_disable = dsu_pmu_disable,
|
|
.event_init = dsu_pmu_event_init,
|
|
.add = dsu_pmu_add,
|
|
.del = dsu_pmu_del,
|
|
.start = dsu_pmu_start,
|
|
.stop = dsu_pmu_stop,
|
|
.read = dsu_pmu_read,
|
|
|
|
.attr_groups = dsu_pmu_attr_groups,
|
|
.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
|
|
};
|
|
|
|
rc = perf_pmu_register(&dsu_pmu->pmu, name, -1);
|
|
if (rc) {
|
|
cpuhp_state_remove_instance(dsu_pmu_cpuhp_state,
|
|
&dsu_pmu->cpuhp_node);
|
|
irq_set_affinity_hint(dsu_pmu->irq, NULL);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int dsu_pmu_device_remove(struct platform_device *pdev)
|
|
{
|
|
struct dsu_pmu *dsu_pmu = platform_get_drvdata(pdev);
|
|
|
|
perf_pmu_unregister(&dsu_pmu->pmu);
|
|
cpuhp_state_remove_instance(dsu_pmu_cpuhp_state, &dsu_pmu->cpuhp_node);
|
|
irq_set_affinity_hint(dsu_pmu->irq, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id dsu_pmu_of_match[] = {
|
|
{ .compatible = "arm,dsu-pmu", },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver dsu_pmu_driver = {
|
|
.driver = {
|
|
.name = DRVNAME,
|
|
.of_match_table = of_match_ptr(dsu_pmu_of_match),
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
.probe = dsu_pmu_device_probe,
|
|
.remove = dsu_pmu_device_remove,
|
|
};
|
|
|
|
static int dsu_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
struct dsu_pmu *dsu_pmu = hlist_entry_safe(node, struct dsu_pmu,
|
|
cpuhp_node);
|
|
|
|
if (!cpumask_test_cpu(cpu, &dsu_pmu->associated_cpus))
|
|
return 0;
|
|
|
|
/* If the PMU is already managed, there is nothing to do */
|
|
if (!cpumask_empty(&dsu_pmu->active_cpu))
|
|
return 0;
|
|
|
|
dsu_pmu_init_pmu(dsu_pmu);
|
|
dsu_pmu_set_active_cpu(cpu, dsu_pmu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dsu_pmu_cpu_teardown(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
int dst;
|
|
struct dsu_pmu *dsu_pmu = hlist_entry_safe(node, struct dsu_pmu,
|
|
cpuhp_node);
|
|
|
|
if (!cpumask_test_and_clear_cpu(cpu, &dsu_pmu->active_cpu))
|
|
return 0;
|
|
|
|
dst = dsu_pmu_get_online_cpu_any_but(dsu_pmu, cpu);
|
|
/* If there are no active CPUs in the DSU, leave IRQ disabled */
|
|
if (dst >= nr_cpu_ids) {
|
|
irq_set_affinity_hint(dsu_pmu->irq, NULL);
|
|
return 0;
|
|
}
|
|
|
|
perf_pmu_migrate_context(&dsu_pmu->pmu, cpu, dst);
|
|
dsu_pmu_set_active_cpu(dst, dsu_pmu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init dsu_pmu_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
|
|
DRVNAME,
|
|
dsu_pmu_cpu_online,
|
|
dsu_pmu_cpu_teardown);
|
|
if (ret < 0)
|
|
return ret;
|
|
dsu_pmu_cpuhp_state = ret;
|
|
return platform_driver_register(&dsu_pmu_driver);
|
|
}
|
|
|
|
static void __exit dsu_pmu_exit(void)
|
|
{
|
|
platform_driver_unregister(&dsu_pmu_driver);
|
|
cpuhp_remove_multi_state(dsu_pmu_cpuhp_state);
|
|
}
|
|
|
|
module_init(dsu_pmu_init);
|
|
module_exit(dsu_pmu_exit);
|
|
|
|
MODULE_DEVICE_TABLE(of, dsu_pmu_of_match);
|
|
MODULE_DESCRIPTION("Perf driver for ARM DynamIQ Shared Unit");
|
|
MODULE_AUTHOR("Suzuki K Poulose <suzuki.poulose@arm.com>");
|
|
MODULE_LICENSE("GPL v2");
|