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perf intel-pt: Fix "Unexpected indirect branch" error 

Some Atom CPUs can produce FUP packets that contain NLIP (next linear
instruction pointer) instead of CLIP (current linear instruction
pointer).  That will result in "Unexpected indirect branch" errors. Fix
by comparing IP to NLIP in that case.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1527762225-26024-5-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-05-31 13:23:45 +03:00 committed by Arnaldo Carvalho de Melo
parent dd27b87ab5
commit 9fb523363f
3 changed files with 28 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
View File

@ -113,6 +113,7 @@ struct intel_pt_decoder {
bool have_cyc;
bool fixup_last_mtc;
bool have_last_ip;
enum intel_pt_param_flags flags;
uint64_t pos;
uint64_t last_ip;
uint64_t ip;
@ -226,6 +227,8 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
decoder->return_compression = params->return_compression;
decoder->branch_enable = params->branch_enable;
decoder->flags = params->flags;
decoder->period = params->period;
decoder->period_type = params->period_type;
@ -1097,6 +1100,15 @@ static bool intel_pt_fup_event(struct intel_pt_decoder *decoder)
return ret;
}
static inline bool intel_pt_fup_with_nlip(struct intel_pt_decoder *decoder,
struct intel_pt_insn *intel_pt_insn,
uint64_t ip, int err)
{
return decoder->flags & INTEL_PT_FUP_WITH_NLIP && !err &&
intel_pt_insn->branch == INTEL_PT_BR_INDIRECT &&
ip == decoder->ip + intel_pt_insn->length;
}
static int intel_pt_walk_fup(struct intel_pt_decoder *decoder)
{
struct intel_pt_insn intel_pt_insn;
@ -1109,10 +1121,11 @@ static int intel_pt_walk_fup(struct intel_pt_decoder *decoder)
err = intel_pt_walk_insn(decoder, &intel_pt_insn, ip);
if (err == INTEL_PT_RETURN)
return 0;
if (err == -EAGAIN) {
if (err == -EAGAIN ||
intel_pt_fup_with_nlip(decoder, &intel_pt_insn, ip, err)) {
if (intel_pt_fup_event(decoder))
return 0;
return err;
return -EAGAIN;
}
decoder->set_fup_tx_flags = false;
if (err)

9
tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
View File

@ -60,6 +60,14 @@ enum {
INTEL_PT_ERR_MAX,
};
enum intel_pt_param_flags {
/*
* FUP packet can contain next linear instruction pointer instead of
* current linear instruction pointer.
*/
INTEL_PT_FUP_WITH_NLIP = 1 << 0,
};
struct intel_pt_state {
enum intel_pt_sample_type type;
int err;
@ -106,6 +114,7 @@ struct intel_pt_params {
unsigned int mtc_period;
uint32_t tsc_ctc_ratio_n;
uint32_t tsc_ctc_ratio_d;
enum intel_pt_param_flags flags;
};
struct intel_pt_decoder;

4
tools/perf/util/intel-pt.c
View File

@ -749,6 +749,7 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
unsigned int queue_nr)
{
struct intel_pt_params params = { .get_trace = 0, };
struct perf_env *env = pt->machine->env;
struct intel_pt_queue *ptq;
ptq = zalloc(sizeof(struct intel_pt_queue));
@ -830,6 +831,9 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
}
}
if (env->cpuid && !strncmp(env->cpuid, "GenuineIntel,6,92,", 18))
params.flags |= INTEL_PT_FUP_WITH_NLIP;
ptq->decoder = intel_pt_decoder_new(&params);
if (!ptq->decoder)
goto out_free;