Commit 2acee108 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo

perf intel-pt: Fix decoding when there are address filters

Due to errata SKL014 "Intel PT TIP.PGD May Not Have Target IP Payload",
the Intel PT decoder needs to match address filters against TIP.PGD
packets.  Parse the address filters and implement the decoder's
'pgd_ip()' callback to match the IP against the filter regions.
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: http://lkml.kernel.org/r/1474641528-18776-17-git-send-email-adrian.hunter@intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 9f1d122b
...@@ -105,6 +105,7 @@ struct intel_pt { ...@@ -105,6 +105,7 @@ struct intel_pt {
unsigned long num_events; unsigned long num_events;
char *filter; char *filter;
struct addr_filters filts;
}; };
enum switch_state { enum switch_state {
...@@ -550,6 +551,76 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn, ...@@ -550,6 +551,76 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn,
return 0; return 0;
} }
static bool intel_pt_match_pgd_ip(struct intel_pt *pt, uint64_t ip,
uint64_t offset, const char *filename)
{
struct addr_filter *filt;
bool have_filter = false;
bool hit_tracestop = false;
bool hit_filter = false;
list_for_each_entry(filt, &pt->filts.head, list) {
if (filt->start)
have_filter = true;
if ((filename && !filt->filename) ||
(!filename && filt->filename) ||
(filename && strcmp(filename, filt->filename)))
continue;
if (!(offset >= filt->addr && offset < filt->addr + filt->size))
continue;
intel_pt_log("TIP.PGD ip %#"PRIx64" offset %#"PRIx64" in %s hit filter: %s offset %#"PRIx64" size %#"PRIx64"\n",
ip, offset, filename ? filename : "[kernel]",
filt->start ? "filter" : "stop",
filt->addr, filt->size);
if (filt->start)
hit_filter = true;
else
hit_tracestop = true;
}
if (!hit_tracestop && !hit_filter)
intel_pt_log("TIP.PGD ip %#"PRIx64" offset %#"PRIx64" in %s is not in a filter region\n",
ip, offset, filename ? filename : "[kernel]");
return hit_tracestop || (have_filter && !hit_filter);
}
static int __intel_pt_pgd_ip(uint64_t ip, void *data)
{
struct intel_pt_queue *ptq = data;
struct thread *thread;
struct addr_location al;
u8 cpumode;
u64 offset;
if (ip >= ptq->pt->kernel_start)
return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL);
cpumode = PERF_RECORD_MISC_USER;
thread = ptq->thread;
if (!thread)
return -EINVAL;
thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al);
if (!al.map || !al.map->dso)
return -EINVAL;
offset = al.map->map_ip(al.map, ip);
return intel_pt_match_pgd_ip(ptq->pt, ip, offset,
al.map->dso->long_name);
}
static bool intel_pt_pgd_ip(uint64_t ip, void *data)
{
return __intel_pt_pgd_ip(ip, data) > 0;
}
static bool intel_pt_get_config(struct intel_pt *pt, static bool intel_pt_get_config(struct intel_pt *pt,
struct perf_event_attr *attr, u64 *config) struct perf_event_attr *attr, u64 *config)
{ {
...@@ -726,6 +797,9 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt, ...@@ -726,6 +797,9 @@ 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_n = pt->tsc_ctc_ratio_n;
params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d; params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d;
if (pt->filts.cnt > 0)
params.pgd_ip = intel_pt_pgd_ip;
if (pt->synth_opts.instructions) { if (pt->synth_opts.instructions) {
if (pt->synth_opts.period) { if (pt->synth_opts.period) {
switch (pt->synth_opts.period_type) { switch (pt->synth_opts.period_type) {
...@@ -1776,6 +1850,7 @@ static void intel_pt_free(struct perf_session *session) ...@@ -1776,6 +1850,7 @@ static void intel_pt_free(struct perf_session *session)
intel_pt_free_events(session); intel_pt_free_events(session);
session->auxtrace = NULL; session->auxtrace = NULL;
thread__put(pt->unknown_thread); thread__put(pt->unknown_thread);
addr_filters__exit(&pt->filts);
zfree(&pt->filter); zfree(&pt->filter);
free(pt); free(pt);
} }
...@@ -2073,6 +2148,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event, ...@@ -2073,6 +2148,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
if (!pt) if (!pt)
return -ENOMEM; return -ENOMEM;
addr_filters__init(&pt->filts);
perf_config(intel_pt_perf_config, pt); perf_config(intel_pt_perf_config, pt);
err = auxtrace_queues__init(&pt->queues); err = auxtrace_queues__init(&pt->queues);
...@@ -2147,6 +2224,10 @@ int intel_pt_process_auxtrace_info(union perf_event *event, ...@@ -2147,6 +2224,10 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
err = -EINVAL; err = -EINVAL;
goto err_free_queues; goto err_free_queues;
} }
err = addr_filters__parse_bare_filter(&pt->filts,
filter);
if (err)
goto err_free_queues;
} }
intel_pt_print_info_str("Filter string", pt->filter); intel_pt_print_info_str("Filter string", pt->filter);
} }
...@@ -2268,6 +2349,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event, ...@@ -2268,6 +2349,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
auxtrace_queues__free(&pt->queues); auxtrace_queues__free(&pt->queues);
session->auxtrace = NULL; session->auxtrace = NULL;
err_free: err_free:
addr_filters__exit(&pt->filts);
zfree(&pt->filter); zfree(&pt->filter);
free(pt); free(pt);
return err; return err;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment