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perf, bpf: Add BPF support to all perf_event types

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Allow BPF_PROG_TYPE_PERF_EVENT program types to attach to all
perf_event types, including HW_CACHE, RAW, and dynamic pmu events.
Only tracepoint/kprobe events are treated differently which require
BPF_PROG_TYPE_TRACEPOINT/BPF_PROG_TYPE_KPROBE program types accordingly.

Also add support for reading all event counters using
bpf_perf_event_read() helper.

Signed-off-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Alexei Starovoitov 2017-06-02 21:03:52 -07:00 • committed by David S. Miller
commit f91840a32d
4 changed files with 48 additions and 56 deletions
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47
kernel/events/core.c
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@ -3636,10 +3636,10 @@ static inline u64 perf_event_count(struct perf_event *event)
* will not be local and we cannot read them atomically
* - must not have a pmu::count method
*/
u64 perf_event_read_local(struct perf_event *event)
int perf_event_read_local(struct perf_event *event, u64 *value)
{
unsigned long flags;
u64 val;
int ret = 0;
/*
* Disabling interrupts avoids all counter scheduling (context
@ -3647,25 +3647,37 @@ u64 perf_event_read_local(struct perf_event *event)
*/
local_irq_save(flags);
/* If this is a per-task event, it must be for current */
WARN_ON_ONCE((event->attach_state & PERF_ATTACH_TASK) &&
event->hw.target != current);
/* If this is a per-CPU event, it must be for this CPU */
WARN_ON_ONCE(!(event->attach_state & PERF_ATTACH_TASK) &&
event->cpu != smp_processor_id());
/*
* It must not be an event with inherit set, we cannot read
* all child counters from atomic context.
*/
WARN_ON_ONCE(event->attr.inherit);
if (event->attr.inherit) {
ret = -EOPNOTSUPP;
goto out;
}
/*
* It must not have a pmu::count method, those are not
* NMI safe.
*/
WARN_ON_ONCE(event->pmu->count);
if (event->pmu->count) {
ret = -EOPNOTSUPP;
goto out;
}
/* If this is a per-task event, it must be for current */
if ((event->attach_state & PERF_ATTACH_TASK) &&
event->hw.target != current) {
ret = -EINVAL;
goto out;
}
/* If this is a per-CPU event, it must be for this CPU */
if (!(event->attach_state & PERF_ATTACH_TASK) &&
event->cpu != smp_processor_id()) {
ret = -EINVAL;
goto out;
}
/*
* If the event is currently on this CPU, its either a per-task event,
@ -3675,10 +3687,11 @@ u64 perf_event_read_local(struct perf_event *event)
if (event->oncpu == smp_processor_id())
event->pmu->read(event);
val = local64_read(&event->count);
*value = local64_read(&event->count);
out:
local_irq_restore(flags);
return val;
return ret;
}
static int perf_event_read(struct perf_event *event, bool group)
@ -8037,12 +8050,8 @@ static int perf_event_set_bpf_prog(struct perf_event *event, u32 prog_fd)
bool is_kprobe, is_tracepoint;
struct bpf_prog *prog;
if (event->attr.type == PERF_TYPE_HARDWARE ||
event->attr.type == PERF_TYPE_SOFTWARE)
return perf_event_set_bpf_handler(event, prog_fd);
if (event->attr.type != PERF_TYPE_TRACEPOINT)
return -EINVAL;
return perf_event_set_bpf_handler(event, prog_fd);
if (event->tp_event->prog)
return -EEXIST;