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perf intel-pt: Add LBR information to synthesized PEBS sample

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Add LBR information from PEBS data in the Intel PT trace to the
synthesized PEBS sample.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190610072803.10456-10-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-06-10 10:28:01 +03:00 committed by Arnaldo Carvalho de Melo
parent 143d34a6b3
commit aa62afd7da
1 changed files with 72 additions and 0 deletions
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72
tools/perf/util/intel-pt.c
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@ -1628,6 +1628,58 @@ static void intel_pt_add_xmm(struct regs_dump *intr_regs, u64 *pos,
}
}
#define LBR_INFO_MISPRED (1ULL << 63)
#define LBR_INFO_IN_TX (1ULL << 62)
#define LBR_INFO_ABORT (1ULL << 61)
#define LBR_INFO_CYCLES 0xffff
/* Refer kernel's intel_pmu_store_pebs_lbrs() */
static u64 intel_pt_lbr_flags(u64 info)
{
union {
struct branch_flags flags;
u64 result;
} u = {
.flags = {
.mispred = !!(info & LBR_INFO_MISPRED),
.predicted = !(info & LBR_INFO_MISPRED),
.in_tx = !!(info & LBR_INFO_IN_TX),
.abort = !!(info & LBR_INFO_ABORT),
.cycles = info & LBR_INFO_CYCLES,
}
};
return u.result;
}
static void intel_pt_add_lbrs(struct branch_stack *br_stack,
const struct intel_pt_blk_items *items)
{
u64 *to;
int i;
br_stack->nr = 0;
to = &br_stack->entries[0].from;
for (i = INTEL_PT_LBR_0_POS; i <= INTEL_PT_LBR_2_POS; i++) {
u32 mask = items->mask[i];
const u64 *from = items->val[i];
for (; mask; mask >>= 3, from += 3) {
if ((mask & 7) == 7) {
*to++ = from[0];
*to++ = from[1];
*to++ = intel_pt_lbr_flags(from[2]);
br_stack->nr += 1;
}
}
}
}
/* INTEL_PT_LBR_0, INTEL_PT_LBR_1 and INTEL_PT_LBR_2 */
#define LBRS_MAX (INTEL_PT_BLK_ITEM_ID_CNT * 3)
static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq)
{
const struct intel_pt_blk_items *items = &ptq->state->items;
@ -1694,6 +1746,26 @@ static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq)
intel_pt_add_xmm(&sample.intr_regs, pos, items, regs_mask);
}
if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
struct {
struct branch_stack br_stack;
struct branch_entry entries[LBRS_MAX];
} br;
if (items->mask[INTEL_PT_LBR_0_POS] ||
items->mask[INTEL_PT_LBR_1_POS] ||
items->mask[INTEL_PT_LBR_2_POS]) {
intel_pt_add_lbrs(&br.br_stack, items);
sample.branch_stack = &br.br_stack;
} else if (pt->synth_opts.last_branch) {
intel_pt_copy_last_branch_rb(ptq);
sample.branch_stack = ptq->last_branch;
} else {
br.br_stack.nr = 0;
sample.branch_stack = &br.br_stack;
}
}
return intel_pt_deliver_synth_event(pt, ptq, event, &sample, sample_type);
}