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#include "asm/unistd.h" /* from kernel source tree */
#include <unistd.h> /* for syscall */
#include <sys/ioctl.h>
#include "perfcounters.h"
#define C(x) (PERF_COUNT_HW_CACHE_##x)
#define ATTR_CONFIG_CACHE(cache, op, result) \
(((C(cache) & 0xffULL) << 0) | \
((C(op) & 0xffULL) << 8) | \
((C(result) & 0xffULL) << 16))
#define ATTR_CONFIG(event, umask) \
((((event) & 0xffULL) << 0) | \
(((umask) & 0xffULL) << 8))
static struct perf_event_attr perf_event_attr = {
.type = 0, /* set per initilized event */
.size = 0, /* set later */
.config = 0, /* set per initilized event */
{ .sample_period = 0, }, /* is a counter, so no period */
.disabled = 0, /* event is enabled */
.inherit = 0, /* children don't inherit */
.pinned = 0, /* set per initilized event */
.exclusive = 0, /* set per initilized event */
.exclude_user = 0, /* don't count user (when set) */
.exclude_kernel = 0, /* ditto kernel */
.exclude_hv = 0, /* ditto hypervisor */
.exclude_idle = 0, /* don't count when idle */
.mmap = 0, /* include mmap data */
.comm = 0, /* include comm data */
};
struct perf_counter_setup {
char *name;
enum perf_type_id type;
uint64_t config;
};
#if 0
/* these events are always zero */
static struct perf_fd perf_fds[] = {
{
.fd = -1,
.name = "MEM_UNCORE_RETIRED.REMOTE_CACHE_LOCAL_HOME_HIT",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0x0f, 0x08),
.exclusive = 0,
.pinned = 0,
},
{
.fd = -1,
.name = "MEM_UNCORE_RETIRED.REMOTE_DRAM",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0x0f, 0x10),
.exclusive = 0, /* child events cannot be exclusive */
.pinned = 0, /* child events cannot be pinned */
},
{ },
};
#endif
static struct perf_counter_setup perf_setup[NR_PERF_COUNTERS] = {
#if 0
{
.name = "MEM_UNCORE_RETIRED.LOCAL_DRAM",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0x0f, 0x20),
},
{
.name = "L2_RQSTS.PREFETCH_HIT",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0x24, 0x40),
},
{
.name = "L2_RQSTS.PREFETCH_MISS",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0x24, 0x80),
},
#endif
{
.name = "MEM_LOAD_RETIRED.OTHER_CORE_L2_HIT_HITM",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0xcb, 0x08),
},
{
.name = "MEM_LOAD_RETIRED.L3_UNSHARED_HIT",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0xcb, 0x04),
},
{
.name = "MEM_LOAD_RETIRED.L3_MISS",
.type = PERF_TYPE_RAW,
.config = ATTR_CONFIG(0xcb, 0x10),
},
{
.name = "Off Core Response Counter",
.type = PERF_TYPE_HW_CACHE,
.config = ATTR_CONFIG_CACHE(LL, OP_READ, RESULT_MISS),
#if 0
/* read misses */
.config = ATTR_CONFIG_CACHE(LL, OP_READ, RESULT_MISS),
/* write misses */
.config = ATTR_CONFIG_CACHE(LL, OP_WRITE, RESULT_MISS),
/* prefetch misses */
.config = ATTR_CONFIG_CACHE(LL, OP_PREFETCH, RESULT_MISS),
#endif
},
};
/* from kernel tools/perf/perf.h */
int sys_perf_event_open(struct perf_event_attr *attr, pid_t pid,
int cpu, int group_fd, unsigned long flags)
{
attr->size = sizeof(*attr);
return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
}
/* make the temporary attributes shadow those in the perf_fd temporarially */
static void write_global_perf_attr(const struct perf_counter_setup *p)
{
perf_event_attr.type = p->type;
perf_event_attr.config = p->config;
perf_event_attr.pinned = 0;
perf_event_attr.exclusive = 0;
}
int setup_cpu_perf(const int cpu, const int group_leader,
struct perf_counter *perf_counters)
{
const int perf_pid = -1; /* -1: all tasks */
int err = 0, i;
if (-1 == group_leader) {
/* first element determines the group for all others */
perf_counters->fd = -1;
}
for (i = 0; i < NR_PERF_COUNTERS; i++) {
int perf_group;
/* setup the attributes to pass in */
write_global_perf_attr(&perf_setup[i]);
if (0 == i && -1 == group_leader) {
/* but group leader is pinned and exclusive */
perf_event_attr.exclusive = 1;
perf_event_attr.pinned = 1;
perf_group = -1;
} else if (-1 == group_leader) {
/* not first counter, but no group passed in */
perf_group = perf_counters[0].fd;
}
perf_counters[i].fd = sys_perf_event_open(&perf_event_attr,
perf_pid, cpu, perf_group, 0);
if (0 > perf_counters[i].fd) {
err = -1;
goto out;
}
/* save the attributes in the user-visible configuration */
perf_counters[i].type = perf_setup[i].type;
perf_counters[i].config = perf_setup[i].config;
}
out:
return err;
}
static inline int perf_setup_match(const struct perf_counter_setup* ps,
const struct perf_counter *pc)
{
return (ps->type == pc->type && ps->config == pc->config);
}
const char* get_perf_name(const struct perf_counter* perf_counter)
{
char *ret = NULL;
int i;
for (i = 0; i < NR_PERF_COUNTERS; i++) {
if (perf_setup_match(&perf_setup[i], perf_counter)) {
ret = perf_setup[i].name;
break;
}
}
return ret;
}
int read_perf_counter(const struct perf_counter* perf_counter, uint64_t *val)
{
ssize_t ret = read(perf_counter->fd, val, sizeof(*val));
return (ret <= 0);
}
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