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perf intel-pt: Pass the first timestamp to the decoder

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VM Time Correlation will use time ranges to determine whether a TSC packet
belongs to the Host or Guest. To start, the first non-zero timestamp is
needed. Pass that to the decoder.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210430070309.17624-10-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2021-04-30 10:03:06 +03:00 committed by Arnaldo Carvalho de Melo
parent 0fc9d33894
commit 5ac35d778a
3 changed files with 31 additions and 0 deletions
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8
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
View file

@ -140,6 +140,7 @@ struct intel_pt_decoder {
uint64_t ctc_delta;
uint64_t cycle_cnt;
uint64_t cyc_ref_timestamp;
uint64_t first_timestamp;
uint32_t last_mtc;
uint32_t tsc_ctc_ratio_n;
uint32_t tsc_ctc_ratio_d;
@ -265,6 +266,7 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
decoder->branch_enable = params->branch_enable;
decoder->hop = params->quick >= 1;
decoder->leap = params->quick >= 2;
decoder->first_timestamp = params->first_timestamp;
decoder->flags = params->flags;
@ -314,6 +316,12 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
return decoder;
}
void intel_pt_set_first_timestamp(struct intel_pt_decoder *decoder,
uint64_t first_timestamp)
{
decoder->first_timestamp = first_timestamp;
}
static void intel_pt_pop_blk(struct intel_pt_stack *stack)
{
struct intel_pt_blk *blk = stack->blk;

4
tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
View file

@ -258,6 +258,7 @@ struct intel_pt_params {
void *data;
bool return_compression;
bool branch_enable;
uint64_t first_timestamp;
uint64_t ctl;
uint64_t period;
enum intel_pt_period_type period_type;
@ -285,4 +286,7 @@ unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
int intel_pt__strerror(int code, char *buf, size_t buflen);
void intel_pt_set_first_timestamp(struct intel_pt_decoder *decoder,
uint64_t first_timestamp);
#endif

19
tools/perf/util/intel-pt.c
View file

@ -78,6 +78,7 @@ struct intel_pt {
u64 kernel_start;
u64 switch_ip;
u64 ptss_ip;
u64 first_timestamp;
struct perf_tsc_conversion tc;
bool cap_user_time_zero;
@ -1181,6 +1182,7 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
params.tsc_ctc_ratio_n = pt->tsc_ctc_ratio_n;
params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d;
params.quick = pt->synth_opts.quick;
params.first_timestamp = pt->first_timestamp;
if (pt->filts.cnt > 0)
params.pgd_ip = intel_pt_pgd_ip;
@ -1245,6 +1247,21 @@ static void intel_pt_free_queue(void *priv)
free(ptq);
}
static void intel_pt_first_timestamp(struct intel_pt *pt, u64 timestamp)
{
unsigned int i;
pt->first_timestamp = timestamp;
for (i = 0; i < pt->queues.nr_queues; i++) {
struct auxtrace_queue *queue = &pt->queues.queue_array[i];
struct intel_pt_queue *ptq = queue->priv;
if (ptq && ptq->decoder)
intel_pt_set_first_timestamp(ptq->decoder, timestamp);
}
}
static void intel_pt_set_pid_tid_cpu(struct intel_pt *pt,
struct auxtrace_queue *queue)
{
@ -2947,6 +2964,8 @@ static int intel_pt_process_event(struct perf_session *session,
sample->time);
}
} else if (timestamp) {
if (!pt->first_timestamp)
intel_pt_first_timestamp(pt, timestamp);
err = intel_pt_process_queues(pt, timestamp);
}
if (err)