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perf intel-pt: Force 'quick' mode when TNT (Taken/Not-Taken packet) is disabled 

It is not possible to walk the executable code without TNT packets, so
force 'quick' mode when TNT is disabled, because 'quick' mode does not walk
the code.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20220124084201.2699795-18-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-01-24 10:41:53 +02:00 committed by Arnaldo Carvalho de Melo
parent 11f18e4773
commit e92403553b
1 changed files with 18 additions and 0 deletions
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18
tools/perf/util/intel-pt.c
View File

@ -50,6 +50,7 @@
#define INTEL_PT_CFG_PWR_EVT_EN BIT_ULL(4)
#define INTEL_PT_CFG_BRANCH_EN BIT_ULL(13)
#define INTEL_PT_CFG_EVT_EN BIT_ULL(31)
#define INTEL_PT_CFG_TNT_DIS BIT_ULL(55)
struct range {
u64 start;
@ -972,6 +973,19 @@ static bool intel_pt_branch_enable(struct intel_pt *pt)
return true;
}
static bool intel_pt_disabled_tnt(struct intel_pt *pt)
{
struct evsel *evsel;
u64 config;
evlist__for_each_entry(pt->session->evlist, evsel) {
if (intel_pt_get_config(pt, &evsel->core.attr, &config) &&
config & INTEL_PT_CFG_TNT_DIS)
return true;
}
return false;
}
static unsigned int intel_pt_mtc_period(struct intel_pt *pt)
{
struct evsel *evsel;
@ -1227,6 +1241,10 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
params.first_timestamp = pt->first_timestamp;
params.max_loops = pt->max_loops;
/* Cannot walk code without TNT, so force 'quick' mode */
if (params.branch_enable && intel_pt_disabled_tnt(pt) && !params.quick)
params.quick = 1;
if (pt->filts.cnt > 0)
params.pgd_ip = intel_pt_pgd_ip;