#include <asm/hardirq.h>
#include <asm/intel-family.h>
#include <asm/apic.h>
+#include <asm/cpu_device_id.h>
#include "../perf_event.h"
arr[0].msr = MSR_CORE_PERF_GLOBAL_CTRL;
arr[0].host = x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_guest_mask;
arr[0].guest = x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_host_mask;
- /*
- * If PMU counter has PEBS enabled it is not enough to disable counter
- * on a guest entry since PEBS memory write can overshoot guest entry
- * and corrupt guest memory. Disabling PEBS solves the problem.
- */
- arr[1].msr = MSR_IA32_PEBS_ENABLE;
- arr[1].host = cpuc->pebs_enabled;
- arr[1].guest = 0;
+ if (x86_pmu.flags & PMU_FL_PEBS_ALL)
+ arr[0].guest &= ~cpuc->pebs_enabled;
+ else
+ arr[0].guest &= ~(cpuc->pebs_enabled & PEBS_COUNTER_MASK);
+ *nr = 1;
+
+ if (x86_pmu.pebs && x86_pmu.pebs_no_isolation) {
+ /*
+ * If PMU counter has PEBS enabled it is not enough to
+ * disable counter on a guest entry since PEBS memory
+ * write can overshoot guest entry and corrupt guest
+ * memory. Disabling PEBS solves the problem.
+ *
+ * Don't do this if the CPU already enforces it.
+ */
+ arr[1].msr = MSR_IA32_PEBS_ENABLE;
+ arr[1].host = cpuc->pebs_enabled;
+ arr[1].guest = 0;
+ *nr = 2;
+ }
- *nr = 2;
return arr;
}
intel_pmu_lbr_sched_task(ctx, sched_in);
}
+ static int intel_pmu_check_period(struct perf_event *event, u64 value)
+ {
+ return intel_pmu_has_bts_period(event, value) ? -EINVAL : 0;
+ }
+
PMU_FORMAT_ATTR(offcore_rsp, "config1:0-63");
PMU_FORMAT_ATTR(ldlat, "config1:0-15");
.cpu_starting = intel_pmu_cpu_starting,
.cpu_dying = intel_pmu_cpu_dying,
.cpu_dead = intel_pmu_cpu_dead,
+
+ .check_period = intel_pmu_check_period,
};
static struct attribute *intel_pmu_attrs[];
.guest_get_msrs = intel_guest_get_msrs,
.sched_task = intel_pmu_sched_task,
+
+ .check_period = intel_pmu_check_period,
};
static __init void intel_clovertown_quirk(void)
x86_pmu.pebs_constraints = NULL;
}
-static int intel_snb_pebs_broken(int cpu)
+static const struct x86_cpu_desc isolation_ucodes[] = {
+ INTEL_CPU_DESC(INTEL_FAM6_HASWELL_CORE, 3, 0x0000001f),
+ INTEL_CPU_DESC(INTEL_FAM6_HASWELL_ULT, 1, 0x0000001e),
+ INTEL_CPU_DESC(INTEL_FAM6_HASWELL_GT3E, 1, 0x00000015),
+ INTEL_CPU_DESC(INTEL_FAM6_HASWELL_X, 2, 0x00000037),
+ INTEL_CPU_DESC(INTEL_FAM6_HASWELL_X, 4, 0x0000000a),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_CORE, 4, 0x00000023),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_GT3E, 1, 0x00000014),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_XEON_D, 2, 0x00000010),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_XEON_D, 3, 0x07000009),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_XEON_D, 4, 0x0f000009),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_XEON_D, 5, 0x0e000002),
+ INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_X, 2, 0x0b000014),
+ INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X, 3, 0x00000021),
+ INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X, 4, 0x00000000),
+ INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_MOBILE, 3, 0x0000007c),
+ INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_DESKTOP, 3, 0x0000007c),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_DESKTOP, 9, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_MOBILE, 9, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_MOBILE, 10, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_MOBILE, 11, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_MOBILE, 12, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_DESKTOP, 10, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_DESKTOP, 11, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_DESKTOP, 12, 0x0000004e),
+ INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE_DESKTOP, 13, 0x0000004e),
+ {}
+};
+
+static void intel_check_pebs_isolation(void)
{
- u32 rev = UINT_MAX; /* default to broken for unknown models */
+ x86_pmu.pebs_no_isolation = !x86_cpu_has_min_microcode_rev(isolation_ucodes);
+}
- switch (cpu_data(cpu).x86_model) {
- case INTEL_FAM6_SANDYBRIDGE:
- rev = 0x28;
- break;
+static __init void intel_pebs_isolation_quirk(void)
+{
+ WARN_ON_ONCE(x86_pmu.check_microcode);
+ x86_pmu.check_microcode = intel_check_pebs_isolation;
+ intel_check_pebs_isolation();
+}
- case INTEL_FAM6_SANDYBRIDGE_X:
- switch (cpu_data(cpu).x86_stepping) {
- case 6: rev = 0x618; break;
- case 7: rev = 0x70c; break;
- }
- }
+static const struct x86_cpu_desc pebs_ucodes[] = {
+ INTEL_CPU_DESC(INTEL_FAM6_SANDYBRIDGE, 7, 0x00000028),
+ INTEL_CPU_DESC(INTEL_FAM6_SANDYBRIDGE_X, 6, 0x00000618),
+ INTEL_CPU_DESC(INTEL_FAM6_SANDYBRIDGE_X, 7, 0x0000070c),
+ {}
+};
- return (cpu_data(cpu).microcode < rev);
+static bool intel_snb_pebs_broken(void)
+{
+ return !x86_cpu_has_min_microcode_rev(pebs_ucodes);
}
static void intel_snb_check_microcode(void)
{
- int pebs_broken = 0;
- int cpu;
-
- for_each_online_cpu(cpu) {
- if ((pebs_broken = intel_snb_pebs_broken(cpu)))
- break;
- }
-
- if (pebs_broken == x86_pmu.pebs_broken)
+ if (intel_snb_pebs_broken() == x86_pmu.pebs_broken)
return;
/*
}
}
-static bool intel_glp_counter_freezing_broken(int cpu)
-{
- u32 rev = UINT_MAX; /* default to broken for unknown stepping */
-
- switch (cpu_data(cpu).x86_stepping) {
- case 1:
- rev = 0x28;
- break;
- case 8:
- rev = 0x6;
- break;
- }
+static const struct x86_cpu_desc counter_freezing_ucodes[] = {
+ INTEL_CPU_DESC(INTEL_FAM6_ATOM_GOLDMONT, 2, 0x0000000e),
+ INTEL_CPU_DESC(INTEL_FAM6_ATOM_GOLDMONT, 9, 0x0000002e),
+ INTEL_CPU_DESC(INTEL_FAM6_ATOM_GOLDMONT, 10, 0x00000008),
+ INTEL_CPU_DESC(INTEL_FAM6_ATOM_GOLDMONT_X, 1, 0x00000028),
+ INTEL_CPU_DESC(INTEL_FAM6_ATOM_GOLDMONT_PLUS, 1, 0x00000028),
+ INTEL_CPU_DESC(INTEL_FAM6_ATOM_GOLDMONT_PLUS, 8, 0x00000006),
+ {}
+};
- return (cpu_data(cpu).microcode < rev);
+static bool intel_counter_freezing_broken(void)
+{
+ return !x86_cpu_has_min_microcode_rev(counter_freezing_ucodes);
}
-static __init void intel_glp_counter_freezing_quirk(void)
+static __init void intel_counter_freezing_quirk(void)
{
/* Check if it's already disabled */
if (disable_counter_freezing)
* If the system starts with the wrong ucode, leave the
* counter-freezing feature permanently disabled.
*/
- if (intel_glp_counter_freezing_broken(raw_smp_processor_id())) {
+ if (intel_counter_freezing_broken()) {
pr_info("PMU counter freezing disabled due to CPU errata,"
"please upgrade microcode\n");
x86_pmu.counter_freezing = false;
case INTEL_FAM6_ATOM_GOLDMONT:
case INTEL_FAM6_ATOM_GOLDMONT_X:
+ x86_add_quirk(intel_counter_freezing_quirk);
memcpy(hw_cache_event_ids, glm_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
memcpy(hw_cache_extra_regs, glm_hw_cache_extra_regs,
break;
case INTEL_FAM6_ATOM_GOLDMONT_PLUS:
- x86_add_quirk(intel_glp_counter_freezing_quirk);
+ x86_add_quirk(intel_counter_freezing_quirk);
memcpy(hw_cache_event_ids, glp_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
memcpy(hw_cache_extra_regs, glp_hw_cache_extra_regs,
case INTEL_FAM6_HASWELL_ULT:
case INTEL_FAM6_HASWELL_GT3E:
x86_add_quirk(intel_ht_bug);
+ x86_add_quirk(intel_pebs_isolation_quirk);
x86_pmu.late_ack = true;
memcpy(hw_cache_event_ids, hsw_hw_cache_event_ids, sizeof(hw_cache_event_ids));
memcpy(hw_cache_extra_regs, hsw_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
case INTEL_FAM6_BROADWELL_XEON_D:
case INTEL_FAM6_BROADWELL_GT3E:
case INTEL_FAM6_BROADWELL_X:
+ x86_add_quirk(intel_pebs_isolation_quirk);
x86_pmu.late_ack = true;
memcpy(hw_cache_event_ids, hsw_hw_cache_event_ids, sizeof(hw_cache_event_ids));
memcpy(hw_cache_extra_regs, hsw_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
case INTEL_FAM6_SKYLAKE_X:
case INTEL_FAM6_KABYLAKE_MOBILE:
case INTEL_FAM6_KABYLAKE_DESKTOP:
+ x86_add_quirk(intel_pebs_isolation_quirk);
x86_pmu.late_ack = true;
memcpy(hw_cache_event_ids, skl_hw_cache_event_ids, sizeof(hw_cache_event_ids));
memcpy(hw_cache_extra_regs, skl_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
/*
* Intel DebugStore bits
*/
- unsigned int bts :1,
- bts_active :1,
- pebs :1,
- pebs_active :1,
- pebs_broken :1,
- pebs_prec_dist :1,
- pebs_no_tlb :1;
+ unsigned int bts :1,
+ bts_active :1,
+ pebs :1,
+ pebs_active :1,
+ pebs_broken :1,
+ pebs_prec_dist :1,
+ pebs_no_tlb :1,
+ pebs_no_isolation :1;
int pebs_record_size;
int pebs_buffer_size;
void (*drain_pebs)(struct pt_regs *regs);
* Intel host/guest support (KVM)
*/
struct perf_guest_switch_msr *(*guest_get_msrs)(int *nr);
+
+ /*
+ * Check period value for PERF_EVENT_IOC_PERIOD ioctl.
+ */
+ int (*check_period) (struct perf_event *event, u64 period);
};
struct x86_perf_task_context {
#ifdef CONFIG_CPU_SUP_INTEL
- static inline bool intel_pmu_has_bts(struct perf_event *event)
+ static inline bool intel_pmu_has_bts_period(struct perf_event *event, u64 period)
{
struct hw_perf_event *hwc = &event->hw;
unsigned int hw_event, bts_event;
hw_event = hwc->config & INTEL_ARCH_EVENT_MASK;
bts_event = x86_pmu.event_map(PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
- return hw_event == bts_event && hwc->sample_period == 1;
+ return hw_event == bts_event && period == 1;
+ }
+
+ static inline bool intel_pmu_has_bts(struct perf_event *event)
+ {
+ struct hw_perf_event *hwc = &event->hw;
+
+ return intel_pmu_has_bts_period(event, hwc->sample_period);
}
int intel_pmu_save_and_restart(struct perf_event *event);
return qdisc_skb_cb(skb)->data;
}
- static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
- struct sk_buff *skb)
+ static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
+ struct sk_buff *skb)
{
u8 *cb_data = bpf_skb_cb(skb);
u8 cb_saved[BPF_SKB_CB_LEN];
return res;
}
+ static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
+ struct sk_buff *skb)
+ {
+ u32 res;
+
+ preempt_disable();
+ res = __bpf_prog_run_save_cb(prog, skb);
+ preempt_enable();
+ return res;
+ }
+
static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
struct sk_buff *skb)
{
u8 *cb_data = bpf_skb_cb(skb);
+ u32 res;
if (unlikely(prog->cb_access))
memset(cb_data, 0, BPF_SKB_CB_LEN);
- return BPF_PROG_RUN(prog, skb);
+ preempt_disable();
+ res = BPF_PROG_RUN(prog, skb);
+ preempt_enable();
+ return res;
}
static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
void bpf_prog_kallsyms_add(struct bpf_prog *fp);
void bpf_prog_kallsyms_del(struct bpf_prog *fp);
+void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
#else /* CONFIG_BPF_JIT */
static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
{
}
+
+static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
+{
+ sym[0] = '\0';
+}
+
#endif /* CONFIG_BPF_JIT */
void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp);
#include <linux/atomic.h>
#include <linux/sysfs.h>
#include <linux/perf_regs.h>
-#include <linux/workqueue.h>
#include <linux/cgroup.h>
+#include <linux/refcount.h>
#include <asm/local.h>
struct perf_callchain_entry {
#define PERF_PMU_CAP_EXCLUSIVE 0x10
#define PERF_PMU_CAP_ITRACE 0x20
#define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x40
+#define PERF_PMU_CAP_NO_EXCLUDE 0x80
/**
* struct pmu - generic performance monitoring unit
/*
* Set up pmu-private data structures for an AUX area
*/
- void *(*setup_aux) (int cpu, void **pages,
+ void *(*setup_aux) (struct perf_event *event, void **pages,
int nr_pages, bool overwrite);
/* optional */
* Filter events for PMU-specific reasons.
*/
int (*filter_match) (struct perf_event *event); /* optional */
+
+ /*
+ * Check period value for PERF_EVENT_IOC_PERIOD ioctl.
+ */
+ int (*check_period) (struct perf_event *event, u64 value); /* optional */
};
enum perf_addr_filter_action_t {
int nr_stat;
int nr_freq;
int rotate_disable;
- atomic_t refcount;
+ refcount_t refcount;
struct task_struct *task;
/*
extern void perf_event_output_backward(struct perf_event *event,
struct perf_sample_data *data,
struct pt_regs *regs);
-extern void perf_event_output(struct perf_event *event,
- struct perf_sample_data *data,
- struct pt_regs *regs);
+extern int perf_event_output(struct perf_event *event,
+ struct perf_sample_data *data,
+ struct pt_regs *regs);
static inline bool
is_default_overflow_handler(struct perf_event *event)
extern void
perf_log_lost_samples(struct perf_event *event, u64 lost);
+static inline bool event_has_any_exclude_flag(struct perf_event *event)
+{
+ struct perf_event_attr *attr = &event->attr;
+
+ return attr->exclude_idle || attr->exclude_user ||
+ attr->exclude_kernel || attr->exclude_hv ||
+ attr->exclude_guest || attr->exclude_host;
+}
+
static inline bool is_sampling_event(struct perf_event *event)
{
return event->attr.sample_period != 0;
}
extern void perf_event_mmap(struct vm_area_struct *vma);
+
+extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
+ bool unregister, const char *sym);
+extern void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags);
+
extern struct perf_guest_info_callbacks *perf_guest_cbs;
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
(struct perf_guest_info_callbacks *callbacks) { return 0; }
static inline void perf_event_mmap(struct vm_area_struct *vma) { }
+
+typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
+static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
+ bool unregister, const char *sym) { }
+static inline void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags) { }
static inline void perf_event_exec(void) { }
static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
static inline void perf_event_namespaces(struct task_struct *tsk) { }
if (bpf_map_is_dev_bound(map)) {
err = bpf_map_offload_lookup_elem(map, key, value);
- } else if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
+ goto done;
+ }
+
+ preempt_disable();
+ this_cpu_inc(bpf_prog_active);
+ if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
+ map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
err = bpf_percpu_hash_copy(map, key, value);
} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
err = bpf_percpu_array_copy(map, key, value);
}
rcu_read_unlock();
}
+ this_cpu_dec(bpf_prog_active);
+ preempt_enable();
+ done:
if (err)
goto free_value;
static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
{
if (atomic_dec_and_test(&prog->aux->refcnt)) {
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
/* bpf_prog_free_id() must be called first */
bpf_prog_free_id(prog, do_idr_lock);
bpf_prog_kallsyms_del_all(prog);
}
bpf_prog_kallsyms_add(prog);
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
return err;
free_used_maps:
+// SPDX-License-Identifier: GPL-2.0
/*
* Performance events core code:
*
* Copyright (C) 2008-2011 Red Hat, Inc., Ingo Molnar
* Copyright (C) 2008-2011 Red Hat, Inc., Peter Zijlstra
* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- *
- * For licensing details see kernel-base/COPYING
*/
#include <linux/fs.h>
static atomic_t nr_task_events __read_mostly;
static atomic_t nr_freq_events __read_mostly;
static atomic_t nr_switch_events __read_mostly;
+static atomic_t nr_ksymbol_events __read_mostly;
+static atomic_t nr_bpf_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
static void get_ctx(struct perf_event_context *ctx)
{
- WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
+ refcount_inc(&ctx->refcount);
}
static void free_ctx(struct rcu_head *head)
static void put_ctx(struct perf_event_context *ctx)
{
- if (atomic_dec_and_test(&ctx->refcount)) {
+ if (refcount_dec_and_test(&ctx->refcount)) {
if (ctx->parent_ctx)
put_ctx(ctx->parent_ctx);
if (ctx->task && ctx->task != TASK_TOMBSTONE)
again:
rcu_read_lock();
ctx = READ_ONCE(event->ctx);
- if (!atomic_inc_not_zero(&ctx->refcount)) {
+ if (!refcount_inc_not_zero(&ctx->refcount)) {
rcu_read_unlock();
goto again;
}
}
if (ctx->task == TASK_TOMBSTONE ||
- !atomic_inc_not_zero(&ctx->refcount)) {
+ !refcount_inc_not_zero(&ctx->refcount)) {
raw_spin_unlock(&ctx->lock);
ctx = NULL;
} else {
INIT_LIST_HEAD(&ctx->event_list);
INIT_LIST_HEAD(&ctx->pinned_active);
INIT_LIST_HEAD(&ctx->flexible_active);
- atomic_set(&ctx->refcount, 1);
+ refcount_set(&ctx->refcount, 1);
}
static struct perf_event_context *
if (attr->mmap || attr->mmap_data || attr->mmap2 ||
attr->comm || attr->comm_exec ||
- attr->task ||
+ attr->task || attr->ksymbol ||
attr->context_switch)
return true;
return false;
dec = true;
if (has_branch_stack(event))
dec = true;
+ if (event->attr.ksymbol)
+ atomic_dec(&nr_ksymbol_events);
+ if (event->attr.bpf_event)
+ atomic_dec(&nr_bpf_events);
if (dec) {
if (!atomic_add_unless(&perf_sched_count, -1, 1))
}
}
+ static int perf_event_check_period(struct perf_event *event, u64 value)
+ {
+ return event->pmu->check_period(event, value);
+ }
+
static int perf_event_period(struct perf_event *event, u64 __user *arg)
{
u64 value;
if (event->attr.freq && value > sysctl_perf_event_sample_rate)
return -EINVAL;
+ if (perf_event_check_period(event, value))
+ return -EINVAL;
+
event_function_call(event, __perf_event_period, &value);
return 0;
rcu_read_lock();
rb = rcu_dereference(event->rb);
if (rb) {
- if (!atomic_inc_not_zero(&rb->refcount))
+ if (!refcount_inc_not_zero(&rb->refcount))
rb = NULL;
}
rcu_read_unlock();
void ring_buffer_put(struct ring_buffer *rb)
{
- if (!atomic_dec_and_test(&rb->refcount))
+ if (!refcount_dec_and_test(&rb->refcount))
return;
WARN_ON_ONCE(!list_empty(&rb->event_list));
/* this has to be the last one */
rb_free_aux(rb);
- WARN_ON_ONCE(atomic_read(&rb->aux_refcount));
+ WARN_ON_ONCE(refcount_read(&rb->aux_refcount));
mutex_unlock(&event->mmap_mutex);
}
data->phys_addr = perf_virt_to_phys(data->addr);
}
-static __always_inline void
+static __always_inline int
__perf_event_output(struct perf_event *event,
struct perf_sample_data *data,
struct pt_regs *regs,
{
struct perf_output_handle handle;
struct perf_event_header header;
+ int err;
/* protect the callchain buffers */
rcu_read_lock();
perf_prepare_sample(&header, data, event, regs);
- if (output_begin(&handle, event, header.size))
+ err = output_begin(&handle, event, header.size);
+ if (err)
goto exit;
perf_output_sample(&handle, &header, data, event);
exit:
rcu_read_unlock();
+ return err;
}
void
__perf_event_output(event, data, regs, perf_output_begin_backward);
}
-void
+int
perf_event_output(struct perf_event *event,
struct perf_sample_data *data,
struct pt_regs *regs)
{
- __perf_event_output(event, data, regs, perf_output_begin);
+ return __perf_event_output(event, data, regs, perf_output_begin);
}
/*
perf_output_end(&handle);
}
+/*
+ * ksymbol register/unregister tracking
+ */
+
+struct perf_ksymbol_event {
+ const char *name;
+ int name_len;
+ struct {
+ struct perf_event_header header;
+ u64 addr;
+ u32 len;
+ u16 ksym_type;
+ u16 flags;
+ } event_id;
+};
+
+static int perf_event_ksymbol_match(struct perf_event *event)
+{
+ return event->attr.ksymbol;
+}
+
+static void perf_event_ksymbol_output(struct perf_event *event, void *data)
+{
+ struct perf_ksymbol_event *ksymbol_event = data;
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ int ret;
+
+ if (!perf_event_ksymbol_match(event))
+ return;
+
+ perf_event_header__init_id(&ksymbol_event->event_id.header,
+ &sample, event);
+ ret = perf_output_begin(&handle, event,
+ ksymbol_event->event_id.header.size);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, ksymbol_event->event_id);
+ __output_copy(&handle, ksymbol_event->name, ksymbol_event->name_len);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
+void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
+ const char *sym)
+{
+ struct perf_ksymbol_event ksymbol_event;
+ char name[KSYM_NAME_LEN];
+ u16 flags = 0;
+ int name_len;
+
+ if (!atomic_read(&nr_ksymbol_events))
+ return;
+
+ if (ksym_type >= PERF_RECORD_KSYMBOL_TYPE_MAX ||
+ ksym_type == PERF_RECORD_KSYMBOL_TYPE_UNKNOWN)
+ goto err;
+
+ strlcpy(name, sym, KSYM_NAME_LEN);
+ name_len = strlen(name) + 1;
+ while (!IS_ALIGNED(name_len, sizeof(u64)))
+ name[name_len++] = '\0';
+ BUILD_BUG_ON(KSYM_NAME_LEN % sizeof(u64));
+
+ if (unregister)
+ flags |= PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER;
+
+ ksymbol_event = (struct perf_ksymbol_event){
+ .name = name,
+ .name_len = name_len,
+ .event_id = {
+ .header = {
+ .type = PERF_RECORD_KSYMBOL,
+ .size = sizeof(ksymbol_event.event_id) +
+ name_len,
+ },
+ .addr = addr,
+ .len = len,
+ .ksym_type = ksym_type,
+ .flags = flags,
+ },
+ };
+
+ perf_iterate_sb(perf_event_ksymbol_output, &ksymbol_event, NULL);
+ return;
+err:
+ WARN_ONCE(1, "%s: Invalid KSYMBOL type 0x%x\n", __func__, ksym_type);
+}
+
+/*
+ * bpf program load/unload tracking
+ */
+
+struct perf_bpf_event {
+ struct bpf_prog *prog;
+ struct {
+ struct perf_event_header header;
+ u16 type;
+ u16 flags;
+ u32 id;
+ u8 tag[BPF_TAG_SIZE];
+ } event_id;
+};
+
+static int perf_event_bpf_match(struct perf_event *event)
+{
+ return event->attr.bpf_event;
+}
+
+static void perf_event_bpf_output(struct perf_event *event, void *data)
+{
+ struct perf_bpf_event *bpf_event = data;
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ int ret;
+
+ if (!perf_event_bpf_match(event))
+ return;
+
+ perf_event_header__init_id(&bpf_event->event_id.header,
+ &sample, event);
+ ret = perf_output_begin(&handle, event,
+ bpf_event->event_id.header.size);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, bpf_event->event_id);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
+static void perf_event_bpf_emit_ksymbols(struct bpf_prog *prog,
+ enum perf_bpf_event_type type)
+{
+ bool unregister = type == PERF_BPF_EVENT_PROG_UNLOAD;
+ char sym[KSYM_NAME_LEN];
+ int i;
+
+ if (prog->aux->func_cnt == 0) {
+ bpf_get_prog_name(prog, sym);
+ perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_BPF,
+ (u64)(unsigned long)prog->bpf_func,
+ prog->jited_len, unregister, sym);
+ } else {
+ for (i = 0; i < prog->aux->func_cnt; i++) {
+ struct bpf_prog *subprog = prog->aux->func[i];
+
+ bpf_get_prog_name(subprog, sym);
+ perf_event_ksymbol(
+ PERF_RECORD_KSYMBOL_TYPE_BPF,
+ (u64)(unsigned long)subprog->bpf_func,
+ subprog->jited_len, unregister, sym);
+ }
+ }
+}
+
+void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags)
+{
+ struct perf_bpf_event bpf_event;
+
+ if (type <= PERF_BPF_EVENT_UNKNOWN ||
+ type >= PERF_BPF_EVENT_MAX)
+ return;
+
+ switch (type) {
+ case PERF_BPF_EVENT_PROG_LOAD:
+ case PERF_BPF_EVENT_PROG_UNLOAD:
+ if (atomic_read(&nr_ksymbol_events))
+ perf_event_bpf_emit_ksymbols(prog, type);
+ break;
+ default:
+ break;
+ }
+
+ if (!atomic_read(&nr_bpf_events))
+ return;
+
+ bpf_event = (struct perf_bpf_event){
+ .prog = prog,
+ .event_id = {
+ .header = {
+ .type = PERF_RECORD_BPF_EVENT,
+ .size = sizeof(bpf_event.event_id),
+ },
+ .type = type,
+ .flags = flags,
+ .id = prog->aux->id,
+ },
+ };
+
+ BUILD_BUG_ON(BPF_TAG_SIZE % sizeof(u64));
+
+ memcpy(bpf_event.event_id.tag, prog->tag, BPF_TAG_SIZE);
+ perf_iterate_sb(perf_event_bpf_output, &bpf_event, NULL);
+}
+
void perf_event_itrace_started(struct perf_event *event)
{
event->attach_state |= PERF_ATTACH_ITRACE;
return 0;
}
+ static int perf_event_nop_int(struct perf_event *event, u64 value)
+ {
+ return 0;
+ }
+
static DEFINE_PER_CPU(unsigned int, nop_txn_flags);
static void perf_pmu_start_txn(struct pmu *pmu, unsigned int flags)
pmu->pmu_disable = perf_pmu_nop_void;
}
+ if (!pmu->check_period)
+ pmu->check_period = perf_event_nop_int;
+
if (!pmu->event_idx)
pmu->event_idx = perf_event_idx_default;
if (ctx)
perf_event_ctx_unlock(event->group_leader, ctx);
+ if (!ret) {
+ if (pmu->capabilities & PERF_PMU_CAP_NO_EXCLUDE &&
+ event_has_any_exclude_flag(event)) {
+ if (event->destroy)
+ event->destroy(event);
+ ret = -EINVAL;
+ }
+ }
+
if (ret)
module_put(pmu->module);
inc = true;
if (is_cgroup_event(event))
inc = true;
+ if (event->attr.ksymbol)
+ atomic_inc(&nr_ksymbol_events);
+ if (event->attr.bpf_event)
+ atomic_inc(&nr_bpf_events);
if (inc) {
/*
again:
rcu_read_lock();
gctx = READ_ONCE(group_leader->ctx);
- if (!atomic_inc_not_zero(&gctx->refcount)) {
+ if (!refcount_inc_not_zero(&gctx->refcount)) {
rcu_read_unlock();
goto again;
}
+// SPDX-License-Identifier: GPL-2.0
/*
* Performance events ring-buffer code:
*
* Copyright (C) 2008-2011 Red Hat, Inc., Ingo Molnar
* Copyright (C) 2008-2011 Red Hat, Inc., Peter Zijlstra
* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- *
- * For licensing details see kernel-base/COPYING
*/
#include <linux/perf_event.h>
else
rb->overwrite = 1;
- atomic_set(&rb->refcount, 1);
+ refcount_set(&rb->refcount, 1);
INIT_LIST_HEAD(&rb->event_list);
spin_lock_init(&rb->event_lock);
if (!atomic_read(&rb->aux_mmap_count))
goto err;
- if (!atomic_inc_not_zero(&rb->aux_refcount))
+ if (!refcount_inc_not_zero(&rb->aux_refcount))
goto err;
/*
goto out;
}
- rb->aux_priv = event->pmu->setup_aux(event->cpu, rb->aux_pages, nr_pages,
+ rb->aux_priv = event->pmu->setup_aux(event, rb->aux_pages, nr_pages,
overwrite);
if (!rb->aux_priv)
goto out;
* we keep a refcount here to make sure either of the two can
* reference them safely.
*/
- atomic_set(&rb->aux_refcount, 1);
+ refcount_set(&rb->aux_refcount, 1);
rb->aux_overwrite = overwrite;
rb->aux_watermark = watermark;
void rb_free_aux(struct ring_buffer *rb)
{
- if (atomic_dec_and_test(&rb->aux_refcount))
+ if (refcount_dec_and_test(&rb->aux_refcount))
__rb_free_aux(rb);
}
size = sizeof(struct ring_buffer);
size += nr_pages * sizeof(void *);
- if (order_base_2(size) >= MAX_ORDER)
+ if (order_base_2(size) >= PAGE_SHIFT+MAX_ORDER)
goto fail;
rb = kzalloc(size, GFP_KERNEL);
if (unlikely(event->oncpu != cpu))
return -EOPNOTSUPP;
- perf_event_output(event, sd, regs);
- return 0;
+ return perf_event_output(event, sd, regs);
}
BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map,
int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog)
{
- int err;
-
- mutex_lock(&bpf_event_mutex);
- err = __bpf_probe_register(btp, prog);
- mutex_unlock(&bpf_event_mutex);
- return err;
+ return __bpf_probe_register(btp, prog);
}
int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog)
{
- int err;
-
- mutex_lock(&bpf_event_mutex);
- err = tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, prog);
- mutex_unlock(&bpf_event_mutex);
- return err;
+ return tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, prog);
}
int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
projects / linux-2.6-microblaze.git / commitdiff