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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 <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2017-06-02 21:03:52 -07:00 • committed by David S. Miller
parent 5071034e4a
commit f91840a32d
4 changed files with 48 additions and 56 deletions
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28
kernel/bpf/arraymap.c
View file

@ -452,38 +452,24 @@ static void bpf_event_entry_free_rcu(struct bpf_event_entry *ee)
static void *perf_event_fd_array_get_ptr(struct bpf_map *map,
struct file *map_file, int fd)
{
const struct perf_event_attr *attr;
struct bpf_event_entry *ee;
struct perf_event *event;
struct file *perf_file;
u64 value;
perf_file = perf_event_get(fd);
if (IS_ERR(perf_file))
return perf_file;
ee = ERR_PTR(-EOPNOTSUPP);
event = perf_file->private_data;
ee = ERR_PTR(-EINVAL);
attr = perf_event_attrs(event);
if (IS_ERR(attr) || attr->inherit)
if (perf_event_read_local(event, &value) == -EOPNOTSUPP)
goto err_out;
switch (attr->type) {
case PERF_TYPE_SOFTWARE:
if (attr->config != PERF_COUNT_SW_BPF_OUTPUT)
goto err_out;
/* fall-through */
case PERF_TYPE_RAW:
case PERF_TYPE_HARDWARE:
ee = bpf_event_entry_gen(perf_file, map_file);
if (ee)
return ee;
ee = ERR_PTR(-ENOMEM);
/* fall-through */
default:
break;
}
ee = bpf_event_entry_gen(perf_file, map_file);
if (ee)
return ee;
ee = ERR_PTR(-ENOMEM);
err_out:
fput(perf_file);
return ee;