kernel - program context from perf sample event

I am using perf_event utility to collect PEBS sample in
kernel space. How can I get context information (interrupt/nmi context, program context)
from perf_sample_data? I can see that perf_regs contains register informations. Which
register bits indicate context of the sample?

Update:

I
am using perf_event_open from userspace and modifying kernel in the perf event handler.
I am configuring perf_event with following attribute (mem trans retired) for Intel
Broadwel machine.

struct
            perf_event_attr pe = {
 .type = PERF_TYPE_RAW,
 .size =
            sizeof(struct perf_event_attr),
 .sample_period = 10003,

            .sample_type = PEBS_SAMPLE_TYPE,
 .exclude_user = 1,

            .exclude_kernel = 0,
 .exclude_hv = 0,

 .disabled = 0,
            
 .config = 0x1cd,
 .config1 = 0x3,
 .precise_ip =
            3,
 .exclude_callchain_kernel = 0,
 .read_format = PERF_FORMAT_GROUP
            | PERF_FORMAT_ID,
 .task = 1,
 };

            perf_event_open(&pe, processId, -1, -1 /*group*/,
            0);

In the
kernel space perf event handler, I have perf_sample_data on each sample event. How can I
know whether the sample was taken from interrupt handler or the sample was from process
context?