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Date: Wed, 9 May 2018 14:43:40 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Joerg Roedel <joro@...tes.org>, Jiri Olsa <jolsa@...hat.com>,
linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH RFC 11/19] perf tools: Synthesize and process mmap events for x86_64 KPTI entry trampolines
Like the kernel text, the location of x86_64 KPTI entry trampolines must be
recorded in the perf.data file. Like the kernel, synthesize a mmap event
for that, and add processing for it.
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
tools/perf/util/event.c | 90 +++++++++++++++++++++++++++++++++++++++++++++--
tools/perf/util/machine.c | 28 +++++++++++++++
2 files changed, 115 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index aafa9878465f..d810ff8488b1 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -888,9 +888,80 @@ int kallsyms__get_function_start(const char *kallsyms_filename,
return 0;
}
-int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
- perf_event__handler_t process,
- struct machine *machine)
+#if defined(__x86_64__)
+
+static int perf_event__synthesize_special_kmaps(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine)
+{
+ int rc = 0;
+ struct map *pos;
+ struct map_groups *kmaps = &machine->kmaps;
+ struct maps *maps = &kmaps->maps;
+ union perf_event *event = zalloc(sizeof(event->mmap) +
+ machine->id_hdr_size);
+
+ if (!event) {
+ pr_debug("Not enough memory synthesizing mmap event "
+ "for special kernel maps\n");
+ return -1;
+ }
+
+ for (pos = maps__first(maps); pos; pos = map__next(pos)) {
+ struct kmap *kmap;
+ size_t size;
+
+ if (!__map__is_special_kernel_map(pos))
+ continue;
+
+ kmap = map__kmap(pos);
+
+ size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
+ PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
+ machine->id_hdr_size;
+
+ memset(event, 0, size);
+
+ event->mmap.header.type = PERF_RECORD_MMAP;
+
+ /*
+ * kernel uses 0 for user space maps, see kernel/perf_event.c
+ * __perf_event_mmap
+ */
+ if (machine__is_host(machine))
+ event->header.misc = PERF_RECORD_MISC_KERNEL;
+ else
+ event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
+
+ event->mmap.header.size = size;
+
+ event->mmap.start = pos->start;
+ event->mmap.len = pos->end - pos->start;
+ event->mmap.pgoff = pos->pgoff;
+ event->mmap.pid = machine->pid;
+
+ strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
+
+ if (perf_tool__process_synth_event(tool, event, machine,
+ process) != 0) {
+ rc = -1;
+ break;
+ }
+ }
+
+ free(event);
+ return rc;
+}
+
+#else
+
+#define perf_event__synthesize_special_kmaps(t, p, m) 0
+
+#endif
+
+static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine)
{
size_t size;
struct map *map = machine__kernel_map(machine);
@@ -943,6 +1014,19 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
return err;
}
+int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine)
+{
+ int err;
+
+ err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
+ if (err < 0)
+ return err;
+
+ return perf_event__synthesize_special_kmaps(tool, process, machine);
+}
+
int perf_event__synthesize_thread_map2(struct perf_tool *tool,
struct thread_map *threads,
perf_event__handler_t process,
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index aa6bb493fcfa..aa938f92d6d1 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1493,6 +1493,32 @@ static bool machine__uses_kcore(struct machine *machine)
return false;
}
+static bool perf_event__is_special_kernel_mmap(struct machine *machine,
+ union perf_event *event)
+{
+ return machine__is(machine, "x86_64") &&
+ is_entry_trampoline(event->mmap.filename);
+}
+
+static int machine__process_special_kernel_map(struct machine *machine,
+ union perf_event *event)
+{
+ struct map *kernel_map = machine__kernel_map(machine);
+ struct dso *kernel = kernel_map ? kernel_map->dso : NULL;
+ struct special_kernal_map sm = {
+ .start = event->mmap.start,
+ .end = event->mmap.start + event->mmap.len,
+ .pgoff = event->mmap.pgoff,
+ };
+
+ if (kernel == NULL)
+ return -1;
+
+ strlcpy(sm.name, event->mmap.filename, KMAP_NAME_LEN);
+
+ return machine__create_special_kernel_map(machine, kernel, &sm);
+}
+
static int machine__process_kernel_mmap_event(struct machine *machine,
union perf_event *event)
{
@@ -1596,6 +1622,8 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
*/
dso__load(kernel, machine__kernel_map(machine));
}
+ } else if (perf_event__is_special_kernel_mmap(machine, event)) {
+ return machine__process_special_kernel_map(machine, event);
}
return 0;
out_problem:
--
1.9.1
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