perf_event_query_prog_array

Name:perf_event_query_prog_array

Proto:int perf_event_query_prog_array(struct perf_event *event, void __user *info)

Type:int

Parameter:

Type	Parameter	Name
struct perf_event *	event
void __user *	info

1392

__user * uquery = info

1393

struct perf_event_query_bpf query = {}

1398

If Not Check operation authority Then Return -EPERM

1400

If type != PERF_TYPE_TRACEPOINT Then Return -EINVAL

1402

If copy_from_user( & query, uquery, size of query ) Then Return -EFAULT

1405

ids_len = The below ids array length

1406

If ids_len > BPF_TRACE_MAX_PROGS Then Return -E2BIG

1408

ids = kcalloc - allocate memory for an array. The memory is set to zero.*@n: number of elements.*@size: element size.*@flags: the type of memory to allocate (see kmalloc).

1409

If Not ids Then Return -ENOMEM

1418

mutex_lock( & bpf_event_mutex)

1419

progs = bpf_event_rcu_dereference(prog_array)

1420

ret = bpf_prog_array_copy_info(progs, ids, ids_len, & prog_cnt)

1421

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

1423

If copy_to_user( & Set by the kernel to indicate the number of* available programs, & prog_cnt, size of prog_cnt ) || copy_to_user(User provided buffer to store program ids, ids, ids_len * sizeof(u32)) Then ret = -EFAULT

1427

1428

Return ret

**Caller**
Name	Describe
_perf_ioctl

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