evsel.c 57.6 KB
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/*
 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Parts came from builtin-{top,stat,record}.c, see those files for further
 * copyright notes.
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

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#include <byteswap.h>
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#include <linux/bitops.h>
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#include <api/fs/tracing_path.h>
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#include <traceevent/event-parse.h>
#include <linux/hw_breakpoint.h>
#include <linux/perf_event.h>
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#include <linux/err.h>
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#include <sys/resource.h>
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#include "asm/bug.h"
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#include "callchain.h"
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#include "cgroup.h"
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#include "evsel.h"
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#include "evlist.h"
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#include "util.h"
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#include "cpumap.h"
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#include "thread_map.h"
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#include "target.h"
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#include "perf_regs.h"
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#include "debug.h"
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#include "trace-event.h"
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#include "stat.h"
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static struct {
	bool sample_id_all;
	bool exclude_guest;
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	bool mmap2;
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	bool cloexec;
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	bool clockid;
	bool clockid_wrong;
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	bool lbr_flags;
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} perf_missing_features;

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static clockid_t clockid;

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static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
{
	return 0;
}

static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
{
}

static struct {
	size_t	size;
	int	(*init)(struct perf_evsel *evsel);
	void	(*fini)(struct perf_evsel *evsel);
} perf_evsel__object = {
	.size = sizeof(struct perf_evsel),
	.init = perf_evsel__no_extra_init,
	.fini = perf_evsel__no_extra_fini,
};

int perf_evsel__object_config(size_t object_size,
			      int (*init)(struct perf_evsel *evsel),
			      void (*fini)(struct perf_evsel *evsel))
{

	if (object_size == 0)
		goto set_methods;

	if (perf_evsel__object.size > object_size)
		return -EINVAL;

	perf_evsel__object.size = object_size;

set_methods:
	if (init != NULL)
		perf_evsel__object.init = init;

	if (fini != NULL)
		perf_evsel__object.fini = fini;

	return 0;
}

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#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))

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int __perf_evsel__sample_size(u64 sample_type)
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{
	u64 mask = sample_type & PERF_SAMPLE_MASK;
	int size = 0;
	int i;

	for (i = 0; i < 64; i++) {
		if (mask & (1ULL << i))
			size++;
	}

	size *= sizeof(u64);

	return size;
}

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/**
 * __perf_evsel__calc_id_pos - calculate id_pos.
 * @sample_type: sample type
 *
 * This function returns the position of the event id (PERF_SAMPLE_ID or
 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
 * sample_event.
 */
static int __perf_evsel__calc_id_pos(u64 sample_type)
{
	int idx = 0;

	if (sample_type & PERF_SAMPLE_IDENTIFIER)
		return 0;

	if (!(sample_type & PERF_SAMPLE_ID))
		return -1;

	if (sample_type & PERF_SAMPLE_IP)
		idx += 1;

	if (sample_type & PERF_SAMPLE_TID)
		idx += 1;

	if (sample_type & PERF_SAMPLE_TIME)
		idx += 1;

	if (sample_type & PERF_SAMPLE_ADDR)
		idx += 1;

	return idx;
}

/**
 * __perf_evsel__calc_is_pos - calculate is_pos.
 * @sample_type: sample type
 *
 * This function returns the position (counting backwards) of the event id
 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
 * sample_id_all is used there is an id sample appended to non-sample events.
 */
static int __perf_evsel__calc_is_pos(u64 sample_type)
{
	int idx = 1;

	if (sample_type & PERF_SAMPLE_IDENTIFIER)
		return 1;

	if (!(sample_type & PERF_SAMPLE_ID))
		return -1;

	if (sample_type & PERF_SAMPLE_CPU)
		idx += 1;

	if (sample_type & PERF_SAMPLE_STREAM_ID)
		idx += 1;

	return idx;
}

void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
{
	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
}

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void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
				  enum perf_event_sample_format bit)
{
	if (!(evsel->attr.sample_type & bit)) {
		evsel->attr.sample_type |= bit;
		evsel->sample_size += sizeof(u64);
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		perf_evsel__calc_id_pos(evsel);
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	}
}

void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
				    enum perf_event_sample_format bit)
{
	if (evsel->attr.sample_type & bit) {
		evsel->attr.sample_type &= ~bit;
		evsel->sample_size -= sizeof(u64);
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		perf_evsel__calc_id_pos(evsel);
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	}
}

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void perf_evsel__set_sample_id(struct perf_evsel *evsel,
			       bool can_sample_identifier)
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{
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	if (can_sample_identifier) {
		perf_evsel__reset_sample_bit(evsel, ID);
		perf_evsel__set_sample_bit(evsel, IDENTIFIER);
	} else {
		perf_evsel__set_sample_bit(evsel, ID);
	}
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	evsel->attr.read_format |= PERF_FORMAT_ID;
}

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void perf_evsel__init(struct perf_evsel *evsel,
		      struct perf_event_attr *attr, int idx)
{
	evsel->idx	   = idx;
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	evsel->tracking	   = !idx;
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	evsel->attr	   = *attr;
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	evsel->leader	   = evsel;
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	evsel->unit	   = "";
	evsel->scale	   = 1.0;
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	evsel->evlist	   = NULL;
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	evsel->bpf_fd	   = -1;
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	INIT_LIST_HEAD(&evsel->node);
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	INIT_LIST_HEAD(&evsel->config_terms);
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	perf_evsel__object.init(evsel);
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	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
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	perf_evsel__calc_id_pos(evsel);
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	evsel->cmdline_group_boundary = false;
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}

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struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
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{
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	struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
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	if (evsel != NULL)
		perf_evsel__init(evsel, attr, idx);
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	if (perf_evsel__is_bpf_output(evsel)) {
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		evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
					    PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
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		evsel->attr.sample_period = 1;
	}

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	return evsel;
}

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/*
 * Returns pointer with encoded error via <linux/err.h> interface.
 */
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struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
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{
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	struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
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	int err = -ENOMEM;
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	if (evsel == NULL) {
		goto out_err;
	} else {
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		struct perf_event_attr attr = {
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			.type	       = PERF_TYPE_TRACEPOINT,
			.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
					  PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
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		};

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		if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
			goto out_free;

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		evsel->tp_format = trace_event__tp_format(sys, name);
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		if (IS_ERR(evsel->tp_format)) {
			err = PTR_ERR(evsel->tp_format);
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			goto out_free;
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		}
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		event_attr_init(&attr);
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		attr.config = evsel->tp_format->id;
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		attr.sample_period = 1;
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		perf_evsel__init(evsel, &attr, idx);
	}

	return evsel;

out_free:
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	zfree(&evsel->name);
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	free(evsel);
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out_err:
	return ERR_PTR(err);
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}

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const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
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	"cycles",
	"instructions",
	"cache-references",
	"cache-misses",
	"branches",
	"branch-misses",
	"bus-cycles",
	"stalled-cycles-frontend",
	"stalled-cycles-backend",
	"ref-cycles",
};

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static const char *__perf_evsel__hw_name(u64 config)
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{
	if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
		return perf_evsel__hw_names[config];

	return "unknown-hardware";
}

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static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
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{
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	int colon = 0, r = 0;
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	struct perf_event_attr *attr = &evsel->attr;
	bool exclude_guest_default = false;

#define MOD_PRINT(context, mod)	do {					\
		if (!attr->exclude_##context) {				\
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			if (!colon) colon = ++r;			\
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			r += scnprintf(bf + r, size - r, "%c", mod);	\
		} } while(0)

	if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
		MOD_PRINT(kernel, 'k');
		MOD_PRINT(user, 'u');
		MOD_PRINT(hv, 'h');
		exclude_guest_default = true;
	}

	if (attr->precise_ip) {
		if (!colon)
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			colon = ++r;
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		r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
		exclude_guest_default = true;
	}

	if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
		MOD_PRINT(host, 'H');
		MOD_PRINT(guest, 'G');
	}
#undef MOD_PRINT
	if (colon)
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		bf[colon - 1] = ':';
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	return r;
}

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static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
}

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const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
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	"cpu-clock",
	"task-clock",
	"page-faults",
	"context-switches",
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	"cpu-migrations",
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	"minor-faults",
	"major-faults",
	"alignment-faults",
	"emulation-faults",
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	"dummy",
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};

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static const char *__perf_evsel__sw_name(u64 config)
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{
	if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
		return perf_evsel__sw_names[config];
	return "unknown-software";
}

static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
}

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static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
{
	int r;

	r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);

	if (type & HW_BREAKPOINT_R)
		r += scnprintf(bf + r, size - r, "r");

	if (type & HW_BREAKPOINT_W)
		r += scnprintf(bf + r, size - r, "w");

	if (type & HW_BREAKPOINT_X)
		r += scnprintf(bf + r, size - r, "x");

	return r;
}

static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	struct perf_event_attr *attr = &evsel->attr;
	int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
	return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
}

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const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
				[PERF_EVSEL__MAX_ALIASES] = {
 { "L1-dcache",	"l1-d",		"l1d",		"L1-data",		},
 { "L1-icache",	"l1-i",		"l1i",		"L1-instruction",	},
 { "LLC",	"L2",							},
 { "dTLB",	"d-tlb",	"Data-TLB",				},
 { "iTLB",	"i-tlb",	"Instruction-TLB",			},
 { "branch",	"branches",	"bpu",		"btb",		"bpc",	},
 { "node",								},
};

const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
				   [PERF_EVSEL__MAX_ALIASES] = {
 { "load",	"loads",	"read",					},
 { "store",	"stores",	"write",				},
 { "prefetch",	"prefetches",	"speculative-read", "speculative-load",	},
};

const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
				       [PERF_EVSEL__MAX_ALIASES] = {
 { "refs",	"Reference",	"ops",		"access",		},
 { "misses",	"miss",							},
};

#define C(x)		PERF_COUNT_HW_CACHE_##x
#define CACHE_READ	(1 << C(OP_READ))
#define CACHE_WRITE	(1 << C(OP_WRITE))
#define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
#define COP(x)		(1 << x)

/*
 * cache operartion stat
 * L1I : Read and prefetch only
 * ITLB and BPU : Read-only
 */
static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
 [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
 [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 [C(ITLB)]	= (CACHE_READ),
 [C(BPU)]	= (CACHE_READ),
 [C(NODE)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
};

bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
{
	if (perf_evsel__hw_cache_stat[type] & COP(op))
		return true;	/* valid */
	else
		return false;	/* invalid */
}

int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
					    char *bf, size_t size)
{
	if (result) {
		return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
				 perf_evsel__hw_cache_op[op][0],
				 perf_evsel__hw_cache_result[result][0]);
	}

	return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
			 perf_evsel__hw_cache_op[op][1]);
}

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static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
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{
	u8 op, result, type = (config >>  0) & 0xff;
	const char *err = "unknown-ext-hardware-cache-type";

	if (type > PERF_COUNT_HW_CACHE_MAX)
		goto out_err;

	op = (config >>  8) & 0xff;
	err = "unknown-ext-hardware-cache-op";
	if (op > PERF_COUNT_HW_CACHE_OP_MAX)
		goto out_err;

	result = (config >> 16) & 0xff;
	err = "unknown-ext-hardware-cache-result";
	if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
		goto out_err;

	err = "invalid-cache";
	if (!perf_evsel__is_cache_op_valid(type, op))
		goto out_err;

	return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
out_err:
	return scnprintf(bf, size, "%s", err);
}

static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
	return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
}

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static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
{
	int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
	return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
}

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const char *perf_evsel__name(struct perf_evsel *evsel)
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{
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	char bf[128];
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	if (evsel->name)
		return evsel->name;
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	switch (evsel->attr.type) {
	case PERF_TYPE_RAW:
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		perf_evsel__raw_name(evsel, bf, sizeof(bf));
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		break;

	case PERF_TYPE_HARDWARE:
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		perf_evsel__hw_name(evsel, bf, sizeof(bf));
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		break;
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	case PERF_TYPE_HW_CACHE:
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		perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
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		break;

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	case PERF_TYPE_SOFTWARE:
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		perf_evsel__sw_name(evsel, bf, sizeof(bf));
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		break;

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	case PERF_TYPE_TRACEPOINT:
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		scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
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		break;

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	case PERF_TYPE_BREAKPOINT:
		perf_evsel__bp_name(evsel, bf, sizeof(bf));
		break;

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	default:
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		scnprintf(bf, sizeof(bf), "unknown attr type: %d",
			  evsel->attr.type);
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		break;
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	}

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	evsel->name = strdup(bf);

	return evsel->name ?: "unknown";
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}

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const char *perf_evsel__group_name(struct perf_evsel *evsel)
{
	return evsel->group_name ?: "anon group";
}

int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
{
	int ret;
	struct perf_evsel *pos;
	const char *group_name = perf_evsel__group_name(evsel);

	ret = scnprintf(buf, size, "%s", group_name);

	ret += scnprintf(buf + ret, size - ret, " { %s",
			 perf_evsel__name(evsel));

	for_each_group_member(pos, evsel)
		ret += scnprintf(buf + ret, size - ret, ", %s",
				 perf_evsel__name(pos));

	ret += scnprintf(buf + ret, size - ret, " }");

	return ret;
}

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void perf_evsel__config_callchain(struct perf_evsel *evsel,
				  struct record_opts *opts,
				  struct callchain_param *param)
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{
	bool function = perf_evsel__is_function_event(evsel);
	struct perf_event_attr *attr = &evsel->attr;

	perf_evsel__set_sample_bit(evsel, CALLCHAIN);

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	if (param->record_mode == CALLCHAIN_LBR) {
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		if (!opts->branch_stack) {
			if (attr->exclude_user) {
				pr_warning("LBR callstack option is only available "
					   "to get user callchain information. "
					   "Falling back to framepointers.\n");
			} else {
				perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
				attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
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							PERF_SAMPLE_BRANCH_CALL_STACK |
							PERF_SAMPLE_BRANCH_NO_CYCLES |
							PERF_SAMPLE_BRANCH_NO_FLAGS;
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			}
		} else
			 pr_warning("Cannot use LBR callstack with branch stack. "
				    "Falling back to framepointers.\n");
	}

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	if (param->record_mode == CALLCHAIN_DWARF) {
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		if (!function) {
			perf_evsel__set_sample_bit(evsel, REGS_USER);
			perf_evsel__set_sample_bit(evsel, STACK_USER);
			attr->sample_regs_user = PERF_REGS_MASK;
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			attr->sample_stack_user = param->dump_size;
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			attr->exclude_callchain_user = 1;
		} else {
			pr_info("Cannot use DWARF unwind for function trace event,"
				" falling back to framepointers.\n");
		}
	}

	if (function) {
		pr_info("Disabling user space callchains for function trace event.\n");
		attr->exclude_callchain_user = 1;
	}
}

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static void
perf_evsel__reset_callgraph(struct perf_evsel *evsel,
			    struct callchain_param *param)
{
	struct perf_event_attr *attr = &evsel->attr;

	perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
	if (param->record_mode == CALLCHAIN_LBR) {
		perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
		attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
					      PERF_SAMPLE_BRANCH_CALL_STACK);
	}
	if (param->record_mode == CALLCHAIN_DWARF) {
		perf_evsel__reset_sample_bit(evsel, REGS_USER);
		perf_evsel__reset_sample_bit(evsel, STACK_USER);
	}
}

static void apply_config_terms(struct perf_evsel *evsel,
			       struct record_opts *opts)
631 632
{
	struct perf_evsel_config_term *term;
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Kan Liang 已提交
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	struct list_head *config_terms = &evsel->config_terms;
	struct perf_event_attr *attr = &evsel->attr;
635 636 637 638 639 640
	struct callchain_param param;
	u32 dump_size = 0;
	char *callgraph_buf = NULL;

	/* callgraph default */
	param.record_mode = callchain_param.record_mode;
641 642 643

	list_for_each_entry(term, config_terms, list) {
		switch (term->type) {
644 645
		case PERF_EVSEL__CONFIG_TERM_PERIOD:
			attr->sample_period = term->val.period;
646
			attr->freq = 0;
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Kan Liang 已提交
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			break;
648 649 650 651
		case PERF_EVSEL__CONFIG_TERM_FREQ:
			attr->sample_freq = term->val.freq;
			attr->freq = 1;
			break;
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Kan Liang 已提交
652 653 654 655 656 657
		case PERF_EVSEL__CONFIG_TERM_TIME:
			if (term->val.time)
				perf_evsel__set_sample_bit(evsel, TIME);
			else
				perf_evsel__reset_sample_bit(evsel, TIME);
			break;
658 659 660 661 662 663
		case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
			callgraph_buf = term->val.callgraph;
			break;
		case PERF_EVSEL__CONFIG_TERM_STACK_USER:
			dump_size = term->val.stack_user;
			break;
664 665 666 667 668 669 670 671 672
		case PERF_EVSEL__CONFIG_TERM_INHERIT:
			/*
			 * attr->inherit should has already been set by
			 * perf_evsel__config. If user explicitly set
			 * inherit using config terms, override global
			 * opt->no_inherit setting.
			 */
			attr->inherit = term->val.inherit ? 1 : 0;
			break;
673 674 675 676
		default:
			break;
		}
	}
677 678 679 680 681 682

	/* User explicitly set per-event callgraph, clear the old setting and reset. */
	if ((callgraph_buf != NULL) || (dump_size > 0)) {

		/* parse callgraph parameters */
		if (callgraph_buf != NULL) {
683 684 685 686 687 688 689 690 691 692 693
			if (!strcmp(callgraph_buf, "no")) {
				param.enabled = false;
				param.record_mode = CALLCHAIN_NONE;
			} else {
				param.enabled = true;
				if (parse_callchain_record(callgraph_buf, &param)) {
					pr_err("per-event callgraph setting for %s failed. "
					       "Apply callgraph global setting for it\n",
					       evsel->name);
					return;
				}
694 695 696 697 698 699 700 701 702 703 704 705 706
			}
		}
		if (dump_size > 0) {
			dump_size = round_up(dump_size, sizeof(u64));
			param.dump_size = dump_size;
		}

		/* If global callgraph set, clear it */
		if (callchain_param.enabled)
			perf_evsel__reset_callgraph(evsel, &callchain_param);

		/* set perf-event callgraph */
		if (param.enabled)
707
			perf_evsel__config_callchain(evsel, opts, &param);
708
	}
709 710
}

711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
/*
 * The enable_on_exec/disabled value strategy:
 *
 *  1) For any type of traced program:
 *    - all independent events and group leaders are disabled
 *    - all group members are enabled
 *
 *     Group members are ruled by group leaders. They need to
 *     be enabled, because the group scheduling relies on that.
 *
 *  2) For traced programs executed by perf:
 *     - all independent events and group leaders have
 *       enable_on_exec set
 *     - we don't specifically enable or disable any event during
 *       the record command
 *
 *     Independent events and group leaders are initially disabled
 *     and get enabled by exec. Group members are ruled by group
 *     leaders as stated in 1).
 *
 *  3) For traced programs attached by perf (pid/tid):
 *     - we specifically enable or disable all events during
 *       the record command
 *
 *     When attaching events to already running traced we
 *     enable/disable events specifically, as there's no
 *     initial traced exec call.
 */
739 740
void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
			struct callchain_param *callchain)
741
{
742
	struct perf_evsel *leader = evsel->leader;
743
	struct perf_event_attr *attr = &evsel->attr;
744
	int track = evsel->tracking;
745
	bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
746

747
	attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
748 749
	attr->inherit	    = !opts->no_inherit;

750 751
	perf_evsel__set_sample_bit(evsel, IP);
	perf_evsel__set_sample_bit(evsel, TID);
752

753 754 755 756 757 758 759
	if (evsel->sample_read) {
		perf_evsel__set_sample_bit(evsel, READ);

		/*
		 * We need ID even in case of single event, because
		 * PERF_SAMPLE_READ process ID specific data.
		 */
760
		perf_evsel__set_sample_id(evsel, false);
761 762 763 764 765 766 767 768 769 770 771

		/*
		 * Apply group format only if we belong to group
		 * with more than one members.
		 */
		if (leader->nr_members > 1) {
			attr->read_format |= PERF_FORMAT_GROUP;
			attr->inherit = 0;
		}
	}

772
	/*
773
	 * We default some events to have a default interval. But keep
774 775
	 * it a weak assumption overridable by the user.
	 */
776
	if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
777 778
				     opts->user_interval != ULLONG_MAX)) {
		if (opts->freq) {
779
			perf_evsel__set_sample_bit(evsel, PERIOD);
780 781 782 783 784 785 786
			attr->freq		= 1;
			attr->sample_freq	= opts->freq;
		} else {
			attr->sample_period = opts->default_interval;
		}
	}

787 788 789 790 791 792 793 794 795
	/*
	 * Disable sampling for all group members other
	 * than leader in case leader 'leads' the sampling.
	 */
	if ((leader != evsel) && leader->sample_read) {
		attr->sample_freq   = 0;
		attr->sample_period = 0;
	}

796 797 798 799 800 801 802
	if (opts->no_samples)
		attr->sample_freq = 0;

	if (opts->inherit_stat)
		attr->inherit_stat = 1;

	if (opts->sample_address) {
803
		perf_evsel__set_sample_bit(evsel, ADDR);
804 805 806
		attr->mmap_data = track;
	}

807 808 809 810 811 812 813 814
	/*
	 * We don't allow user space callchains for  function trace
	 * event, due to issues with page faults while tracing page
	 * fault handler and its overall trickiness nature.
	 */
	if (perf_evsel__is_function_event(evsel))
		evsel->attr.exclude_callchain_user = 1;

815
	if (callchain && callchain->enabled && !evsel->no_aux_samples)
816
		perf_evsel__config_callchain(evsel, opts, callchain);
817

818
	if (opts->sample_intr_regs) {
819
		attr->sample_regs_intr = opts->sample_intr_regs;
820 821 822
		perf_evsel__set_sample_bit(evsel, REGS_INTR);
	}

823
	if (target__has_cpu(&opts->target))
824
		perf_evsel__set_sample_bit(evsel, CPU);
825

826
	if (opts->period)
827
		perf_evsel__set_sample_bit(evsel, PERIOD);
828

829 830 831 832 833
	/*
	 * When the user explicitely disabled time don't force it here.
	 */
	if (opts->sample_time &&
	    (!perf_missing_features.sample_id_all &&
834 835
	    (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
	     opts->sample_time_set)))
836
		perf_evsel__set_sample_bit(evsel, TIME);
837

838
	if (opts->raw_samples && !evsel->no_aux_samples) {
839 840 841
		perf_evsel__set_sample_bit(evsel, TIME);
		perf_evsel__set_sample_bit(evsel, RAW);
		perf_evsel__set_sample_bit(evsel, CPU);
842 843
	}

844
	if (opts->sample_address)
845
		perf_evsel__set_sample_bit(evsel, DATA_SRC);
846

847
	if (opts->no_buffering) {
848 849 850
		attr->watermark = 0;
		attr->wakeup_events = 1;
	}
851
	if (opts->branch_stack && !evsel->no_aux_samples) {
852
		perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
853 854
		attr->branch_sample_type = opts->branch_stack;
	}
855

856
	if (opts->sample_weight)
857
		perf_evsel__set_sample_bit(evsel, WEIGHT);
858

859
	attr->task  = track;
860
	attr->mmap  = track;
861
	attr->mmap2 = track && !perf_missing_features.mmap2;
862
	attr->comm  = track;
863

864 865 866
	if (opts->record_switch_events)
		attr->context_switch = track;

867
	if (opts->sample_transaction)
868
		perf_evsel__set_sample_bit(evsel, TRANSACTION);
869

870 871 872 873 874 875
	if (opts->running_time) {
		evsel->attr.read_format |=
			PERF_FORMAT_TOTAL_TIME_ENABLED |
			PERF_FORMAT_TOTAL_TIME_RUNNING;
	}

876 877 878 879 880 881
	/*
	 * XXX see the function comment above
	 *
	 * Disabling only independent events or group leaders,
	 * keeping group members enabled.
	 */
882
	if (perf_evsel__is_group_leader(evsel))
883 884 885 886 887 888
		attr->disabled = 1;

	/*
	 * Setting enable_on_exec for independent events and
	 * group leaders for traced executed by perf.
	 */
889 890
	if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
		!opts->initial_delay)
891
		attr->enable_on_exec = 1;
892 893 894 895 896

	if (evsel->immediate) {
		attr->disabled = 0;
		attr->enable_on_exec = 0;
	}
897 898 899 900 901 902

	clockid = opts->clockid;
	if (opts->use_clockid) {
		attr->use_clockid = 1;
		attr->clockid = opts->clockid;
	}
903

904 905 906
	if (evsel->precise_max)
		perf_event_attr__set_max_precise_ip(attr);

907 908 909 910 911 912 913 914 915 916
	if (opts->all_user) {
		attr->exclude_kernel = 1;
		attr->exclude_user   = 0;
	}

	if (opts->all_kernel) {
		attr->exclude_kernel = 0;
		attr->exclude_user   = 1;
	}

917 918 919 920
	/*
	 * Apply event specific term settings,
	 * it overloads any global configuration.
	 */
921
	apply_config_terms(evsel, opts);
922 923
}

924
static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
925
{
926
	int cpu, thread;
927 928 929 930

	if (evsel->system_wide)
		nthreads = 1;

931
	evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
932 933 934 935 936 937 938 939 940

	if (evsel->fd) {
		for (cpu = 0; cpu < ncpus; cpu++) {
			for (thread = 0; thread < nthreads; thread++) {
				FD(evsel, cpu, thread) = -1;
			}
		}
	}

941 942 943
	return evsel->fd != NULL ? 0 : -ENOMEM;
}

944 945
static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
			  int ioc,  void *arg)
946 947 948
{
	int cpu, thread;

949 950 951
	if (evsel->system_wide)
		nthreads = 1;

952 953 954
	for (cpu = 0; cpu < ncpus; cpu++) {
		for (thread = 0; thread < nthreads; thread++) {
			int fd = FD(evsel, cpu, thread),
955
			    err = ioctl(fd, ioc, arg);
956 957 958 959 960 961 962 963 964

			if (err)
				return err;
		}
	}

	return 0;
}

965 966
int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
			     const char *filter)
967 968 969 970 971 972
{
	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
				     PERF_EVENT_IOC_SET_FILTER,
				     (void *)filter);
}

973 974 975 976 977 978 979 980 981 982 983 984 985
int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
{
	char *new_filter = strdup(filter);

	if (new_filter != NULL) {
		free(evsel->filter);
		evsel->filter = new_filter;
		return 0;
	}

	return -1;
}

986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
int perf_evsel__append_filter(struct perf_evsel *evsel,
			      const char *op, const char *filter)
{
	char *new_filter;

	if (evsel->filter == NULL)
		return perf_evsel__set_filter(evsel, filter);

	if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
		free(evsel->filter);
		evsel->filter = new_filter;
		return 0;
	}

	return -1;
}

1003
int perf_evsel__enable(struct perf_evsel *evsel)
1004
{
1005 1006 1007
	int nthreads = thread_map__nr(evsel->threads);
	int ncpus = cpu_map__nr(evsel->cpus);

1008 1009 1010 1011 1012
	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
				     PERF_EVENT_IOC_ENABLE,
				     0);
}

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1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
int perf_evsel__disable(struct perf_evsel *evsel)
{
	int nthreads = thread_map__nr(evsel->threads);
	int ncpus = cpu_map__nr(evsel->cpus);

	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
				     PERF_EVENT_IOC_DISABLE,
				     0);
}

1023 1024
int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
{
1025 1026 1027
	if (ncpus == 0 || nthreads == 0)
		return 0;

1028 1029 1030
	if (evsel->system_wide)
		nthreads = 1;

1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
	evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
	if (evsel->sample_id == NULL)
		return -ENOMEM;

	evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
	if (evsel->id == NULL) {
		xyarray__delete(evsel->sample_id);
		evsel->sample_id = NULL;
		return -ENOMEM;
	}

	return 0;
1043 1044
}

1045
static void perf_evsel__free_fd(struct perf_evsel *evsel)
1046 1047 1048 1049 1050
{
	xyarray__delete(evsel->fd);
	evsel->fd = NULL;
}

1051
static void perf_evsel__free_id(struct perf_evsel *evsel)
1052
{
1053 1054
	xyarray__delete(evsel->sample_id);
	evsel->sample_id = NULL;
1055
	zfree(&evsel->id);
1056 1057
}

1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
{
	struct perf_evsel_config_term *term, *h;

	list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
		list_del(&term->list);
		free(term);
	}
}

1068 1069 1070 1071
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	int cpu, thread;

1072 1073 1074
	if (evsel->system_wide)
		nthreads = 1;

1075 1076 1077 1078 1079 1080 1081
	for (cpu = 0; cpu < ncpus; cpu++)
		for (thread = 0; thread < nthreads; ++thread) {
			close(FD(evsel, cpu, thread));
			FD(evsel, cpu, thread) = -1;
		}
}

1082
void perf_evsel__exit(struct perf_evsel *evsel)
1083 1084
{
	assert(list_empty(&evsel->node));
1085
	assert(evsel->evlist == NULL);
1086 1087
	perf_evsel__free_fd(evsel);
	perf_evsel__free_id(evsel);
1088
	perf_evsel__free_config_terms(evsel);
1089
	close_cgroup(evsel->cgrp);
1090
	cpu_map__put(evsel->cpus);
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Adrian Hunter 已提交
1091
	cpu_map__put(evsel->own_cpus);
1092
	thread_map__put(evsel->threads);
1093 1094
	zfree(&evsel->group_name);
	zfree(&evsel->name);
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Arnaldo Carvalho de Melo 已提交
1095
	perf_evsel__object.fini(evsel);
1096 1097 1098 1099 1100
}

void perf_evsel__delete(struct perf_evsel *evsel)
{
	perf_evsel__exit(evsel);
1101 1102
	free(evsel);
}
1103

1104
void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1105
				struct perf_counts_values *count)
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
{
	struct perf_counts_values tmp;

	if (!evsel->prev_raw_counts)
		return;

	if (cpu == -1) {
		tmp = evsel->prev_raw_counts->aggr;
		evsel->prev_raw_counts->aggr = *count;
	} else {
1116 1117
		tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
		*perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1118 1119 1120 1121 1122 1123 1124
	}

	count->val = count->val - tmp.val;
	count->ena = count->ena - tmp.ena;
	count->run = count->run - tmp.run;
}

1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
void perf_counts_values__scale(struct perf_counts_values *count,
			       bool scale, s8 *pscaled)
{
	s8 scaled = 0;

	if (scale) {
		if (count->run == 0) {
			scaled = -1;
			count->val = 0;
		} else if (count->run < count->ena) {
			scaled = 1;
			count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
		}
	} else
		count->ena = count->run = 0;

	if (pscaled)
		*pscaled = scaled;
}

1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
		     struct perf_counts_values *count)
{
	memset(count, 0, sizeof(*count));

	if (FD(evsel, cpu, thread) < 0)
		return -EINVAL;

	if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
		return -errno;

	return 0;
}

1159 1160 1161 1162 1163 1164 1165 1166 1167
int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
			      int cpu, int thread, bool scale)
{
	struct perf_counts_values count;
	size_t nv = scale ? 3 : 1;

	if (FD(evsel, cpu, thread) < 0)
		return -EINVAL;

1168
	if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1169 1170
		return -ENOMEM;

1171 1172 1173
	if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
		return -errno;

1174
	perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1175
	perf_counts_values__scale(&count, scale, NULL);
1176
	*perf_counts(evsel->counts, cpu, thread) = count;
1177 1178 1179
	return 0;
}

1180 1181 1182 1183 1184
static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
{
	struct perf_evsel *leader = evsel->leader;
	int fd;

1185
	if (perf_evsel__is_group_leader(evsel))
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
		return -1;

	/*
	 * Leader must be already processed/open,
	 * if not it's a bug.
	 */
	BUG_ON(!leader->fd);

	fd = FD(leader, cpu, thread);
	BUG_ON(fd == -1);

	return fd;
}

1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
struct bit_names {
	int bit;
	const char *name;
};

static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
{
	bool first_bit = true;
	int i = 0;

	do {
		if (value & bits[i].bit) {
			buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
			first_bit = false;
		}
	} while (bits[++i].name != NULL);
}

static void __p_sample_type(char *buf, size_t size, u64 value)
{
#define bit_name(n) { PERF_SAMPLE_##n, #n }
	struct bit_names bits[] = {
		bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
		bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
		bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
		bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1226
		bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1227
		bit_name(WEIGHT),
1228 1229 1230 1231 1232 1233
		{ .name = NULL, }
	};
#undef bit_name
	__p_bits(buf, size, value, bits);
}

1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
static void __p_branch_sample_type(char *buf, size_t size, u64 value)
{
#define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
	struct bit_names bits[] = {
		bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
		bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
		bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
		bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
		bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
		{ .name = NULL, }
	};
#undef bit_name
	__p_bits(buf, size, value, bits);
}

1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
static void __p_read_format(char *buf, size_t size, u64 value)
{
#define bit_name(n) { PERF_FORMAT_##n, #n }
	struct bit_names bits[] = {
		bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
		bit_name(ID), bit_name(GROUP),
		{ .name = NULL, }
	};
#undef bit_name
	__p_bits(buf, size, value, bits);
}

#define BUF_SIZE		1024

1263
#define p_hex(val)		snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1264 1265 1266
#define p_unsigned(val)		snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
#define p_signed(val)		snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
#define p_sample_type(val)	__p_sample_type(buf, BUF_SIZE, val)
1267
#define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
#define p_read_format(val)	__p_read_format(buf, BUF_SIZE, val)

#define PRINT_ATTRn(_n, _f, _p)				\
do {							\
	if (attr->_f) {					\
		_p(attr->_f);				\
		ret += attr__fprintf(fp, _n, buf, priv);\
	}						\
} while (0)

#define PRINT_ATTRf(_f, _p)	PRINT_ATTRn(#_f, _f, _p)

int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
			     attr__fprintf_f attr__fprintf, void *priv)
{
	char buf[BUF_SIZE];
	int ret = 0;

	PRINT_ATTRf(type, p_unsigned);
	PRINT_ATTRf(size, p_unsigned);
	PRINT_ATTRf(config, p_hex);
	PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
	PRINT_ATTRf(sample_type, p_sample_type);
	PRINT_ATTRf(read_format, p_read_format);

	PRINT_ATTRf(disabled, p_unsigned);
	PRINT_ATTRf(inherit, p_unsigned);
	PRINT_ATTRf(pinned, p_unsigned);
	PRINT_ATTRf(exclusive, p_unsigned);
	PRINT_ATTRf(exclude_user, p_unsigned);
	PRINT_ATTRf(exclude_kernel, p_unsigned);
	PRINT_ATTRf(exclude_hv, p_unsigned);
	PRINT_ATTRf(exclude_idle, p_unsigned);
	PRINT_ATTRf(mmap, p_unsigned);
	PRINT_ATTRf(comm, p_unsigned);
	PRINT_ATTRf(freq, p_unsigned);
	PRINT_ATTRf(inherit_stat, p_unsigned);
	PRINT_ATTRf(enable_on_exec, p_unsigned);
	PRINT_ATTRf(task, p_unsigned);
	PRINT_ATTRf(watermark, p_unsigned);
	PRINT_ATTRf(precise_ip, p_unsigned);
	PRINT_ATTRf(mmap_data, p_unsigned);
	PRINT_ATTRf(sample_id_all, p_unsigned);
	PRINT_ATTRf(exclude_host, p_unsigned);
	PRINT_ATTRf(exclude_guest, p_unsigned);
	PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
	PRINT_ATTRf(exclude_callchain_user, p_unsigned);
	PRINT_ATTRf(mmap2, p_unsigned);
	PRINT_ATTRf(comm_exec, p_unsigned);
	PRINT_ATTRf(use_clockid, p_unsigned);
1318
	PRINT_ATTRf(context_switch, p_unsigned);
1319 1320 1321 1322 1323

	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
	PRINT_ATTRf(bp_type, p_unsigned);
	PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
	PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1324
	PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1325 1326 1327 1328
	PRINT_ATTRf(sample_regs_user, p_hex);
	PRINT_ATTRf(sample_stack_user, p_unsigned);
	PRINT_ATTRf(clockid, p_signed);
	PRINT_ATTRf(sample_regs_intr, p_hex);
1329
	PRINT_ATTRf(aux_watermark, p_unsigned);
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1330 1331 1332 1333

	return ret;
}

1334 1335 1336 1337 1338 1339
static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
				void *priv __attribute__((unused)))
{
	return fprintf(fp, "  %-32s %s\n", name, val);
}

1340
static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1341
			      struct thread_map *threads)
1342
{
1343
	int cpu, thread, nthreads;
1344
	unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1345
	int pid = -1, err;
1346
	enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1347

1348 1349 1350 1351 1352
	if (evsel->system_wide)
		nthreads = 1;
	else
		nthreads = threads->nr;

1353
	if (evsel->fd == NULL &&
1354
	    perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1355
		return -ENOMEM;
1356

S
Stephane Eranian 已提交
1357
	if (evsel->cgrp) {
1358
		flags |= PERF_FLAG_PID_CGROUP;
S
Stephane Eranian 已提交
1359 1360 1361
		pid = evsel->cgrp->fd;
	}

1362
fallback_missing_features:
1363 1364 1365 1366 1367 1368
	if (perf_missing_features.clockid_wrong)
		evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
	if (perf_missing_features.clockid) {
		evsel->attr.use_clockid = 0;
		evsel->attr.clockid = 0;
	}
1369 1370
	if (perf_missing_features.cloexec)
		flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1371 1372
	if (perf_missing_features.mmap2)
		evsel->attr.mmap2 = 0;
1373 1374
	if (perf_missing_features.exclude_guest)
		evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1375 1376 1377
	if (perf_missing_features.lbr_flags)
		evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
				     PERF_SAMPLE_BRANCH_NO_CYCLES);
1378 1379 1380 1381
retry_sample_id:
	if (perf_missing_features.sample_id_all)
		evsel->attr.sample_id_all = 0;

1382 1383 1384 1385 1386 1387
	if (verbose >= 2) {
		fprintf(stderr, "%.60s\n", graph_dotted_line);
		fprintf(stderr, "perf_event_attr:\n");
		perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
		fprintf(stderr, "%.60s\n", graph_dotted_line);
	}
A
Adrian Hunter 已提交
1388

1389
	for (cpu = 0; cpu < cpus->nr; cpu++) {
1390

1391
		for (thread = 0; thread < nthreads; thread++) {
1392
			int group_fd;
S
Stephane Eranian 已提交
1393

1394
			if (!evsel->cgrp && !evsel->system_wide)
1395
				pid = thread_map__pid(threads, thread);
S
Stephane Eranian 已提交
1396

1397
			group_fd = get_group_fd(evsel, cpu, thread);
1398
retry_open:
1399
			pr_debug2("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx\n",
A
Adrian Hunter 已提交
1400 1401
				  pid, cpus->map[cpu], group_fd, flags);

1402
			FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
S
Stephane Eranian 已提交
1403
								     pid,
1404
								     cpus->map[cpu],
S
Stephane Eranian 已提交
1405
								     group_fd, flags);
1406 1407
			if (FD(evsel, cpu, thread) < 0) {
				err = -errno;
1408
				pr_debug2("sys_perf_event_open failed, error %d\n",
1409
					  err);
1410
				goto try_fallback;
1411
			}
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427

			if (evsel->bpf_fd >= 0) {
				int evt_fd = FD(evsel, cpu, thread);
				int bpf_fd = evsel->bpf_fd;

				err = ioctl(evt_fd,
					    PERF_EVENT_IOC_SET_BPF,
					    bpf_fd);
				if (err && errno != EEXIST) {
					pr_err("failed to attach bpf fd %d: %s\n",
					       bpf_fd, strerror(errno));
					err = -EINVAL;
					goto out_close;
				}
			}

1428
			set_rlimit = NO_CHANGE;
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439

			/*
			 * If we succeeded but had to kill clockid, fail and
			 * have perf_evsel__open_strerror() print us a nice
			 * error.
			 */
			if (perf_missing_features.clockid ||
			    perf_missing_features.clockid_wrong) {
				err = -EINVAL;
				goto out_close;
			}
1440
		}
1441 1442 1443 1444
	}

	return 0;

1445
try_fallback:
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	/*
	 * perf stat needs between 5 and 22 fds per CPU. When we run out
	 * of them try to increase the limits.
	 */
	if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
		struct rlimit l;
		int old_errno = errno;

		if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
			if (set_rlimit == NO_CHANGE)
				l.rlim_cur = l.rlim_max;
			else {
				l.rlim_cur = l.rlim_max + 1000;
				l.rlim_max = l.rlim_cur;
			}
			if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
				set_rlimit++;
				errno = old_errno;
				goto retry_open;
			}
		}
		errno = old_errno;
	}

1470 1471 1472
	if (err != -EINVAL || cpu > 0 || thread > 0)
		goto out_close;

1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483
	/*
	 * Must probe features in the order they were added to the
	 * perf_event_attr interface.
	 */
	if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
		perf_missing_features.clockid_wrong = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
		perf_missing_features.clockid = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1484 1485 1486
		perf_missing_features.cloexec = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1487 1488 1489 1490
		perf_missing_features.mmap2 = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.exclude_guest &&
		   (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1491 1492 1493 1494 1495
		perf_missing_features.exclude_guest = true;
		goto fallback_missing_features;
	} else if (!perf_missing_features.sample_id_all) {
		perf_missing_features.sample_id_all = true;
		goto retry_sample_id;
1496 1497 1498 1499 1500 1501
	} else if (!perf_missing_features.lbr_flags &&
			(evsel->attr.branch_sample_type &
			 (PERF_SAMPLE_BRANCH_NO_CYCLES |
			  PERF_SAMPLE_BRANCH_NO_FLAGS))) {
		perf_missing_features.lbr_flags = true;
		goto fallback_missing_features;
1502 1503
	}

1504
out_close:
1505 1506 1507 1508 1509
	do {
		while (--thread >= 0) {
			close(FD(evsel, cpu, thread));
			FD(evsel, cpu, thread) = -1;
		}
1510
		thread = nthreads;
1511
	} while (--cpu >= 0);
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521
	return err;
}

void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	if (evsel->fd == NULL)
		return;

	perf_evsel__close_fd(evsel, ncpus, nthreads);
	perf_evsel__free_fd(evsel);
1522 1523
}

1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
static struct {
	struct cpu_map map;
	int cpus[1];
} empty_cpu_map = {
	.map.nr	= 1,
	.cpus	= { -1, },
};

static struct {
	struct thread_map map;
	int threads[1];
} empty_thread_map = {
	.map.nr	 = 1,
	.threads = { -1, },
};

1540
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1541
		     struct thread_map *threads)
1542
{
1543 1544 1545
	if (cpus == NULL) {
		/* Work around old compiler warnings about strict aliasing */
		cpus = &empty_cpu_map.map;
1546 1547
	}

1548 1549
	if (threads == NULL)
		threads = &empty_thread_map.map;
1550

1551
	return __perf_evsel__open(evsel, cpus, threads);
1552 1553
}

1554
int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1555
			     struct cpu_map *cpus)
1556
{
1557
	return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1558
}
1559

1560
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1561
				struct thread_map *threads)
1562
{
1563
	return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1564
}
1565

1566 1567 1568
static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
				       const union perf_event *event,
				       struct perf_sample *sample)
1569
{
1570
	u64 type = evsel->attr.sample_type;
1571
	const u64 *array = event->sample.array;
1572
	bool swapped = evsel->needs_swap;
1573
	union u64_swap u;
1574 1575 1576 1577

	array += ((event->header.size -
		   sizeof(event->header)) / sizeof(u64)) - 1;

1578 1579 1580 1581 1582
	if (type & PERF_SAMPLE_IDENTIFIER) {
		sample->id = *array;
		array--;
	}

1583
	if (type & PERF_SAMPLE_CPU) {
1584 1585 1586 1587 1588 1589 1590 1591
		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
		}

		sample->cpu = u.val32[0];
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
		array--;
	}

	if (type & PERF_SAMPLE_STREAM_ID) {
		sample->stream_id = *array;
		array--;
	}

	if (type & PERF_SAMPLE_ID) {
		sample->id = *array;
		array--;
	}

	if (type & PERF_SAMPLE_TIME) {
		sample->time = *array;
		array--;
	}

	if (type & PERF_SAMPLE_TID) {
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
		}

		sample->pid = u.val32[0];
		sample->tid = u.val32[1];
1621
		array--;
1622 1623 1624 1625 1626
	}

	return 0;
}

1627 1628
static inline bool overflow(const void *endp, u16 max_size, const void *offset,
			    u64 size)
1629
{
1630 1631
	return size > max_size || offset + size > endp;
}
1632

1633 1634 1635 1636 1637
#define OVERFLOW_CHECK(offset, size, max_size)				\
	do {								\
		if (overflow(endp, (max_size), (offset), (size)))	\
			return -EFAULT;					\
	} while (0)
1638

1639 1640
#define OVERFLOW_CHECK_u64(offset) \
	OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1641

1642
int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1643
			     struct perf_sample *data)
1644
{
1645
	u64 type = evsel->attr.sample_type;
1646
	bool swapped = evsel->needs_swap;
1647
	const u64 *array;
1648 1649 1650
	u16 max_size = event->header.size;
	const void *endp = (void *)event + max_size;
	u64 sz;
1651

1652 1653 1654 1655
	/*
	 * used for cross-endian analysis. See git commit 65014ab3
	 * for why this goofiness is needed.
	 */
1656
	union u64_swap u;
1657

1658
	memset(data, 0, sizeof(*data));
1659 1660
	data->cpu = data->pid = data->tid = -1;
	data->stream_id = data->id = data->time = -1ULL;
1661
	data->period = evsel->attr.sample_period;
1662
	data->weight = 0;
1663
	data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1664 1665

	if (event->header.type != PERF_RECORD_SAMPLE) {
1666
		if (!evsel->attr.sample_id_all)
1667
			return 0;
1668
		return perf_evsel__parse_id_sample(evsel, event, data);
1669 1670 1671 1672
	}

	array = event->sample.array;

1673 1674 1675 1676 1677
	/*
	 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
	 * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
	 * check the format does not go past the end of the event.
	 */
1678
	if (evsel->sample_size + sizeof(event->header) > event->header.size)
1679 1680
		return -EFAULT;

1681 1682 1683 1684 1685 1686
	data->id = -1ULL;
	if (type & PERF_SAMPLE_IDENTIFIER) {
		data->id = *array;
		array++;
	}

1687
	if (type & PERF_SAMPLE_IP) {
1688
		data->ip = *array;
1689 1690 1691 1692
		array++;
	}

	if (type & PERF_SAMPLE_TID) {
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
		}

		data->pid = u.val32[0];
		data->tid = u.val32[1];
1703 1704 1705 1706 1707 1708 1709 1710
		array++;
	}

	if (type & PERF_SAMPLE_TIME) {
		data->time = *array;
		array++;
	}

1711
	data->addr = 0;
1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
	if (type & PERF_SAMPLE_ADDR) {
		data->addr = *array;
		array++;
	}

	if (type & PERF_SAMPLE_ID) {
		data->id = *array;
		array++;
	}

	if (type & PERF_SAMPLE_STREAM_ID) {
		data->stream_id = *array;
		array++;
	}

	if (type & PERF_SAMPLE_CPU) {
1728 1729 1730 1731 1732 1733 1734 1735 1736

		u.val64 = *array;
		if (swapped) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
		}

		data->cpu = u.val32[0];
1737 1738 1739 1740 1741 1742 1743 1744 1745
		array++;
	}

	if (type & PERF_SAMPLE_PERIOD) {
		data->period = *array;
		array++;
	}

	if (type & PERF_SAMPLE_READ) {
1746 1747
		u64 read_format = evsel->attr.read_format;

1748
		OVERFLOW_CHECK_u64(array);
1749 1750 1751 1752 1753 1754 1755 1756
		if (read_format & PERF_FORMAT_GROUP)
			data->read.group.nr = *array;
		else
			data->read.one.value = *array;

		array++;

		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1757
			OVERFLOW_CHECK_u64(array);
1758 1759 1760 1761 1762
			data->read.time_enabled = *array;
			array++;
		}

		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1763
			OVERFLOW_CHECK_u64(array);
1764 1765 1766 1767 1768 1769
			data->read.time_running = *array;
			array++;
		}

		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
		if (read_format & PERF_FORMAT_GROUP) {
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
			const u64 max_group_nr = UINT64_MAX /
					sizeof(struct sample_read_value);

			if (data->read.group.nr > max_group_nr)
				return -EFAULT;
			sz = data->read.group.nr *
			     sizeof(struct sample_read_value);
			OVERFLOW_CHECK(array, sz, max_size);
			data->read.group.values =
					(struct sample_read_value *)array;
			array = (void *)array + sz;
1781
		} else {
1782
			OVERFLOW_CHECK_u64(array);
1783 1784 1785
			data->read.one.id = *array;
			array++;
		}
1786 1787 1788
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
1789
		const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1790

1791 1792 1793
		OVERFLOW_CHECK_u64(array);
		data->callchain = (struct ip_callchain *)array++;
		if (data->callchain->nr > max_callchain_nr)
1794
			return -EFAULT;
1795 1796 1797
		sz = data->callchain->nr * sizeof(u64);
		OVERFLOW_CHECK(array, sz, max_size);
		array = (void *)array + sz;
1798 1799 1800
	}

	if (type & PERF_SAMPLE_RAW) {
1801
		OVERFLOW_CHECK_u64(array);
1802 1803 1804 1805 1806 1807 1808 1809 1810
		u.val64 = *array;
		if (WARN_ONCE(swapped,
			      "Endianness of raw data not corrected!\n")) {
			/* undo swap of u64, then swap on individual u32s */
			u.val64 = bswap_64(u.val64);
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
		}
		data->raw_size = u.val32[0];
1811
		array = (void *)array + sizeof(u32);
1812

1813 1814 1815
		OVERFLOW_CHECK(array, data->raw_size, max_size);
		data->raw_data = (void *)array;
		array = (void *)array + data->raw_size;
1816 1817
	}

1818
	if (type & PERF_SAMPLE_BRANCH_STACK) {
1819 1820
		const u64 max_branch_nr = UINT64_MAX /
					  sizeof(struct branch_entry);
1821

1822 1823
		OVERFLOW_CHECK_u64(array);
		data->branch_stack = (struct branch_stack *)array++;
1824

1825 1826
		if (data->branch_stack->nr > max_branch_nr)
			return -EFAULT;
1827
		sz = data->branch_stack->nr * sizeof(struct branch_entry);
1828 1829
		OVERFLOW_CHECK(array, sz, max_size);
		array = (void *)array + sz;
1830
	}
1831 1832

	if (type & PERF_SAMPLE_REGS_USER) {
1833
		OVERFLOW_CHECK_u64(array);
1834 1835
		data->user_regs.abi = *array;
		array++;
1836

1837
		if (data->user_regs.abi) {
1838
			u64 mask = evsel->attr.sample_regs_user;
1839

1840
			sz = hweight_long(mask) * sizeof(u64);
1841
			OVERFLOW_CHECK(array, sz, max_size);
1842
			data->user_regs.mask = mask;
1843
			data->user_regs.regs = (u64 *)array;
1844
			array = (void *)array + sz;
1845 1846 1847 1848
		}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
1849 1850
		OVERFLOW_CHECK_u64(array);
		sz = *array++;
1851 1852 1853 1854

		data->user_stack.offset = ((char *)(array - 1)
					  - (char *) event);

1855
		if (!sz) {
1856 1857
			data->user_stack.size = 0;
		} else {
1858
			OVERFLOW_CHECK(array, sz, max_size);
1859
			data->user_stack.data = (char *)array;
1860 1861
			array = (void *)array + sz;
			OVERFLOW_CHECK_u64(array);
1862
			data->user_stack.size = *array++;
1863 1864 1865
			if (WARN_ONCE(data->user_stack.size > sz,
				      "user stack dump failure\n"))
				return -EFAULT;
1866 1867 1868
		}
	}

1869 1870
	data->weight = 0;
	if (type & PERF_SAMPLE_WEIGHT) {
1871
		OVERFLOW_CHECK_u64(array);
1872 1873 1874 1875
		data->weight = *array;
		array++;
	}

1876 1877
	data->data_src = PERF_MEM_DATA_SRC_NONE;
	if (type & PERF_SAMPLE_DATA_SRC) {
1878
		OVERFLOW_CHECK_u64(array);
1879 1880 1881 1882
		data->data_src = *array;
		array++;
	}

1883 1884
	data->transaction = 0;
	if (type & PERF_SAMPLE_TRANSACTION) {
1885
		OVERFLOW_CHECK_u64(array);
1886 1887 1888 1889
		data->transaction = *array;
		array++;
	}

1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
	data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
	if (type & PERF_SAMPLE_REGS_INTR) {
		OVERFLOW_CHECK_u64(array);
		data->intr_regs.abi = *array;
		array++;

		if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
			u64 mask = evsel->attr.sample_regs_intr;

			sz = hweight_long(mask) * sizeof(u64);
			OVERFLOW_CHECK(array, sz, max_size);
			data->intr_regs.mask = mask;
			data->intr_regs.regs = (u64 *)array;
			array = (void *)array + sz;
		}
	}

1907 1908
	return 0;
}
1909

1910
size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1911
				     u64 read_format)
1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
{
	size_t sz, result = sizeof(struct sample_event);

	if (type & PERF_SAMPLE_IDENTIFIER)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_IP)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_TID)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_TIME)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_ADDR)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_ID)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_STREAM_ID)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_CPU)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_PERIOD)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_READ) {
		result += sizeof(u64);
		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
			result += sizeof(u64);
		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
			result += sizeof(u64);
		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
		if (read_format & PERF_FORMAT_GROUP) {
			sz = sample->read.group.nr *
			     sizeof(struct sample_read_value);
			result += sz;
		} else {
			result += sizeof(u64);
		}
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
		sz = (sample->callchain->nr + 1) * sizeof(u64);
		result += sz;
	}

	if (type & PERF_SAMPLE_RAW) {
		result += sizeof(u32);
		result += sample->raw_size;
	}

	if (type & PERF_SAMPLE_BRANCH_STACK) {
		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
		sz += sizeof(u64);
		result += sz;
	}

	if (type & PERF_SAMPLE_REGS_USER) {
		if (sample->user_regs.abi) {
			result += sizeof(u64);
1977
			sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
			result += sz;
		} else {
			result += sizeof(u64);
		}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
		sz = sample->user_stack.size;
		result += sizeof(u64);
		if (sz) {
			result += sz;
			result += sizeof(u64);
		}
	}

	if (type & PERF_SAMPLE_WEIGHT)
		result += sizeof(u64);

	if (type & PERF_SAMPLE_DATA_SRC)
		result += sizeof(u64);

1999 2000 2001
	if (type & PERF_SAMPLE_TRANSACTION)
		result += sizeof(u64);

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
	if (type & PERF_SAMPLE_REGS_INTR) {
		if (sample->intr_regs.abi) {
			result += sizeof(u64);
			sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
			result += sz;
		} else {
			result += sizeof(u64);
		}
	}

2012 2013 2014
	return result;
}

2015
int perf_event__synthesize_sample(union perf_event *event, u64 type,
2016
				  u64 read_format,
2017 2018 2019 2020
				  const struct perf_sample *sample,
				  bool swapped)
{
	u64 *array;
2021
	size_t sz;
2022 2023 2024 2025
	/*
	 * used for cross-endian analysis. See git commit 65014ab3
	 * for why this goofiness is needed.
	 */
2026
	union u64_swap u;
2027 2028 2029

	array = event->sample.array;

2030 2031 2032 2033 2034
	if (type & PERF_SAMPLE_IDENTIFIER) {
		*array = sample->id;
		array++;
	}

2035
	if (type & PERF_SAMPLE_IP) {
2036
		*array = sample->ip;
2037 2038 2039 2040 2041 2042 2043 2044
		array++;
	}

	if (type & PERF_SAMPLE_TID) {
		u.val32[0] = sample->pid;
		u.val32[1] = sample->tid;
		if (swapped) {
			/*
2045
			 * Inverse of what is done in perf_evsel__parse_sample
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
			 */
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
			u.val64 = bswap_64(u.val64);
		}

		*array = u.val64;
		array++;
	}

	if (type & PERF_SAMPLE_TIME) {
		*array = sample->time;
		array++;
	}

	if (type & PERF_SAMPLE_ADDR) {
		*array = sample->addr;
		array++;
	}

	if (type & PERF_SAMPLE_ID) {
		*array = sample->id;
		array++;
	}

	if (type & PERF_SAMPLE_STREAM_ID) {
		*array = sample->stream_id;
		array++;
	}

	if (type & PERF_SAMPLE_CPU) {
		u.val32[0] = sample->cpu;
		if (swapped) {
			/*
2080
			 * Inverse of what is done in perf_evsel__parse_sample
2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093
			 */
			u.val32[0] = bswap_32(u.val32[0]);
			u.val64 = bswap_64(u.val64);
		}
		*array = u.val64;
		array++;
	}

	if (type & PERF_SAMPLE_PERIOD) {
		*array = sample->period;
		array++;
	}

2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
	if (type & PERF_SAMPLE_READ) {
		if (read_format & PERF_FORMAT_GROUP)
			*array = sample->read.group.nr;
		else
			*array = sample->read.one.value;
		array++;

		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
			*array = sample->read.time_enabled;
			array++;
		}

		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
			*array = sample->read.time_running;
			array++;
		}

		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
		if (read_format & PERF_FORMAT_GROUP) {
			sz = sample->read.group.nr *
			     sizeof(struct sample_read_value);
			memcpy(array, sample->read.group.values, sz);
			array = (void *)array + sz;
		} else {
			*array = sample->read.one.id;
			array++;
		}
	}

	if (type & PERF_SAMPLE_CALLCHAIN) {
		sz = (sample->callchain->nr + 1) * sizeof(u64);
		memcpy(array, sample->callchain, sz);
		array = (void *)array + sz;
	}

	if (type & PERF_SAMPLE_RAW) {
		u.val32[0] = sample->raw_size;
		if (WARN_ONCE(swapped,
			      "Endianness of raw data not corrected!\n")) {
			/*
			 * Inverse of what is done in perf_evsel__parse_sample
			 */
			u.val32[0] = bswap_32(u.val32[0]);
			u.val32[1] = bswap_32(u.val32[1]);
			u.val64 = bswap_64(u.val64);
		}
		*array = u.val64;
		array = (void *)array + sizeof(u32);

		memcpy(array, sample->raw_data, sample->raw_size);
		array = (void *)array + sample->raw_size;
	}

	if (type & PERF_SAMPLE_BRANCH_STACK) {
		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
		sz += sizeof(u64);
		memcpy(array, sample->branch_stack, sz);
		array = (void *)array + sz;
	}

	if (type & PERF_SAMPLE_REGS_USER) {
		if (sample->user_regs.abi) {
			*array++ = sample->user_regs.abi;
2157
			sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
			memcpy(array, sample->user_regs.regs, sz);
			array = (void *)array + sz;
		} else {
			*array++ = 0;
		}
	}

	if (type & PERF_SAMPLE_STACK_USER) {
		sz = sample->user_stack.size;
		*array++ = sz;
		if (sz) {
			memcpy(array, sample->user_stack.data, sz);
			array = (void *)array + sz;
			*array++ = sz;
		}
	}

	if (type & PERF_SAMPLE_WEIGHT) {
		*array = sample->weight;
		array++;
	}

	if (type & PERF_SAMPLE_DATA_SRC) {
		*array = sample->data_src;
		array++;
	}

2185 2186 2187 2188 2189
	if (type & PERF_SAMPLE_TRANSACTION) {
		*array = sample->transaction;
		array++;
	}

2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200
	if (type & PERF_SAMPLE_REGS_INTR) {
		if (sample->intr_regs.abi) {
			*array++ = sample->intr_regs.abi;
			sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
			memcpy(array, sample->intr_regs.regs, sz);
			array = (void *)array + sz;
		} else {
			*array++ = 0;
		}
	}

2201 2202
	return 0;
}
2203

2204 2205 2206 2207 2208
struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
{
	return pevent_find_field(evsel->tp_format, name);
}

2209
void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2210 2211
			 const char *name)
{
2212
	struct format_field *field = perf_evsel__field(evsel, name);
2213 2214
	int offset;

2215 2216
	if (!field)
		return NULL;
2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230

	offset = field->offset;

	if (field->flags & FIELD_IS_DYNAMIC) {
		offset = *(int *)(sample->raw_data + field->offset);
		offset &= 0xffff;
	}

	return sample->raw_data + offset;
}

u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
		       const char *name)
{
2231
	struct format_field *field = perf_evsel__field(evsel, name);
2232 2233
	void *ptr;
	u64 value;
2234

2235 2236
	if (!field)
		return 0;
2237

2238
	ptr = sample->raw_data + field->offset;
2239

2240 2241 2242 2243 2244 2245 2246 2247 2248 2249
	switch (field->size) {
	case 1:
		return *(u8 *)ptr;
	case 2:
		value = *(u16 *)ptr;
		break;
	case 4:
		value = *(u32 *)ptr;
		break;
	case 8:
2250
		memcpy(&value, ptr, sizeof(u64));
2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
		break;
	default:
		return 0;
	}

	if (!evsel->needs_swap)
		return value;

	switch (field->size) {
	case 2:
		return bswap_16(value);
	case 4:
		return bswap_32(value);
	case 8:
		return bswap_64(value);
	default:
		return 0;
	}

	return 0;
2271
}
2272

2273 2274 2275
bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
			  char *msg, size_t msgsize)
{
2276
	if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292
	    evsel->attr.type   == PERF_TYPE_HARDWARE &&
	    evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
		/*
		 * If it's cycles then fall back to hrtimer based
		 * cpu-clock-tick sw counter, which is always available even if
		 * no PMU support.
		 *
		 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
		 * b0a873e).
		 */
		scnprintf(msg, msgsize, "%s",
"The cycles event is not supported, trying to fall back to cpu-clock-ticks");

		evsel->attr.type   = PERF_TYPE_SOFTWARE;
		evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;

2293
		zfree(&evsel->name);
2294 2295 2296 2297 2298
		return true;
	}

	return false;
}
2299

2300
int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2301 2302
			      int err, char *msg, size_t size)
{
2303 2304
	char sbuf[STRERR_BUFSIZE];

2305 2306 2307
	switch (err) {
	case EPERM:
	case EACCES:
2308
		return scnprintf(msg, size,
2309 2310 2311 2312 2313 2314 2315 2316 2317
		 "You may not have permission to collect %sstats.\n\n"
		 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
		 "which controls use of the performance events system by\n"
		 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
		 "The default value is 1:\n\n"
		 "  -1: Allow use of (almost) all events by all users\n"
		 ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
		 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
		 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
2318 2319 2320 2321 2322 2323 2324
				 target->system_wide ? "system-wide " : "");
	case ENOENT:
		return scnprintf(msg, size, "The %s event is not supported.",
				 perf_evsel__name(evsel));
	case EMFILE:
		return scnprintf(msg, size, "%s",
			 "Too many events are opened.\n"
2325 2326 2327
			 "Probably the maximum number of open file descriptors has been reached.\n"
			 "Hint: Try again after reducing the number of events.\n"
			 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
	case ENODEV:
		if (target->cpu_list)
			return scnprintf(msg, size, "%s",
	 "No such device - did you specify an out-of-range profile CPU?\n");
		break;
	case EOPNOTSUPP:
		if (evsel->attr.precise_ip)
			return scnprintf(msg, size, "%s",
	"\'precise\' request may not be supported. Try removing 'p' modifier.");
#if defined(__i386__) || defined(__x86_64__)
		if (evsel->attr.type == PERF_TYPE_HARDWARE)
			return scnprintf(msg, size, "%s",
	"No hardware sampling interrupt available.\n"
	"No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
#endif
		break;
2344 2345 2346 2347 2348 2349
	case EBUSY:
		if (find_process("oprofiled"))
			return scnprintf(msg, size,
	"The PMU counters are busy/taken by another profiler.\n"
	"We found oprofile daemon running, please stop it and try again.");
		break;
2350 2351 2352 2353 2354 2355
	case EINVAL:
		if (perf_missing_features.clockid)
			return scnprintf(msg, size, "clockid feature not supported.");
		if (perf_missing_features.clockid_wrong)
			return scnprintf(msg, size, "wrong clockid (%d).", clockid);
		break;
2356 2357 2358 2359 2360
	default:
		break;
	}

	return scnprintf(msg, size,
2361
	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2362 2363
	"/bin/dmesg may provide additional information.\n"
	"No CONFIG_PERF_EVENTS=y kernel support configured?\n",
2364 2365
			 err, strerror_r(err, sbuf, sizeof(sbuf)),
			 perf_evsel__name(evsel));
2366
}