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From: Adrian Hunter <adrian.hunter@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Andi Kleen <ak@linux.intel.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>, Jiri Olsa <jolsa@redhat.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org
Subject: [PATCH V2 10/20] perf tools: Allow for extra kernel maps
Date: Thu, 17 May 2018 12:21:58 +0300	[thread overview]
Message-ID: <1526548928-20790-11-git-send-email-adrian.hunter@intel.com> (raw)
In-Reply-To: <1526548928-20790-1-git-send-email-adrian.hunter@intel.com>

Identify extra kernel maps by name so that they can be distinguished from
the kernel map and module maps.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/event.c   |  2 +-
 tools/perf/util/machine.c |  8 ++++++--
 tools/perf/util/map.c     | 22 ++++++++++++++++++----
 tools/perf/util/map.h     |  7 ++++++-
 tools/perf/util/symbol.c  |  7 +++----
 5 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 244135b5ea43..aafa9878465f 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -487,7 +487,7 @@ int perf_event__synthesize_modules(struct perf_tool *tool,
 	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 		size_t size;
 
-		if (__map__is_kernel(pos))
+		if (!__map__is_kmodule(pos))
 			continue;
 
 		size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 13fb283635ad..fb609f5e31e2 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -856,6 +856,7 @@ struct extra_kernel_map {
 	u64 start;
 	u64 end;
 	u64 pgoff;
+	char name[KMAP_NAME_LEN];
 };
 
 static int machine__create_extra_kernel_map(struct machine *machine,
@@ -875,11 +876,12 @@ static int machine__create_extra_kernel_map(struct machine *machine,
 	kmap = map__kmap(map);
 
 	kmap->kmaps = &machine->kmaps;
+	strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);
 
 	map_groups__insert(&machine->kmaps, map);
 
-	pr_debug2("Added extra kernel map %" PRIx64 "-%" PRIx64 "\n",
-		  map->start, map->end);
+	pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
+		  kmap->name, map->start, map->end);
 
 	map__put(map);
 
@@ -940,6 +942,8 @@ int machine__map_x86_64_entry_trampolines(struct machine *machine,
 			.pgoff = pgoff,
 		};
 
+		strlcpy(xm.name, ENTRY_TRAMPOLINE_NAME, KMAP_NAME_LEN);
+
 		if (machine__create_extra_kernel_map(machine, kernel, &xm) < 0)
 			return -1;
 	}
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index c8fe836e4c3c..6ae97eda370b 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -252,6 +252,13 @@ bool __map__is_kernel(const struct map *map)
 	return machine__kernel_map(map->groups->machine) == map;
 }
 
+bool __map__is_extra_kernel_map(const struct map *map)
+{
+	struct kmap *kmap = __map__kmap((struct map *)map);
+
+	return kmap && kmap->name[0];
+}
+
 bool map__has_symbols(const struct map *map)
 {
 	return dso__has_symbols(map->dso);
@@ -846,15 +853,22 @@ struct map *map__next(struct map *map)
 	return NULL;
 }
 
-struct kmap *map__kmap(struct map *map)
+struct kmap *__map__kmap(struct map *map)
 {
-	if (!map->dso || !map->dso->kernel) {
-		pr_err("Internal error: map__kmap with a non-kernel map\n");
+	if (!map->dso || !map->dso->kernel)
 		return NULL;
-	}
 	return (struct kmap *)(map + 1);
 }
 
+struct kmap *map__kmap(struct map *map)
+{
+	struct kmap *kmap = __map__kmap(map);
+
+	if (!kmap)
+		pr_err("Internal error: map__kmap with a non-kernel map\n");
+	return kmap;
+}
+
 struct map_groups *map__kmaps(struct map *map)
 {
 	struct kmap *kmap = map__kmap(map);
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index fafcc375ed37..97e2a063bd65 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -47,9 +47,12 @@ struct map {
 	refcount_t		refcnt;
 };
 
+#define KMAP_NAME_LEN 256
+
 struct kmap {
 	struct ref_reloc_sym	*ref_reloc_sym;
 	struct map_groups	*kmaps;
+	char			name[KMAP_NAME_LEN];
 };
 
 struct maps {
@@ -76,6 +79,7 @@ static inline struct map_groups *map_groups__get(struct map_groups *mg)
 
 void map_groups__put(struct map_groups *mg);
 
+struct kmap *__map__kmap(struct map *map);
 struct kmap *map__kmap(struct map *map);
 struct map_groups *map__kmaps(struct map *map);
 
@@ -232,10 +236,11 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name);
 
 bool __map__is_kernel(const struct map *map);
+bool __map__is_extra_kernel_map(const struct map *map);
 
 static inline bool __map__is_kmodule(const struct map *map)
 {
-	return !__map__is_kernel(map);
+	return !__map__is_kernel(map) && !__map__is_extra_kernel_map(map);
 }
 
 bool map__has_symbols(const struct map *map);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 929058da6727..cdddae67f40c 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1030,7 +1030,7 @@ struct map *map_groups__first(struct map_groups *mg)
 	return maps__first(&mg->maps);
 }
 
-static int do_validate_kcore_modules(const char *filename, struct map *map,
+static int do_validate_kcore_modules(const char *filename,
 				  struct map_groups *kmaps)
 {
 	struct rb_root modules = RB_ROOT;
@@ -1046,8 +1046,7 @@ static int do_validate_kcore_modules(const char *filename, struct map *map,
 		struct map *next = map_groups__next(old_map);
 		struct module_info *mi;
 
-		if (old_map == map || old_map->start == map->start) {
-			/* The kernel map */
+		if (!__map__is_kmodule(old_map)) {
 			old_map = next;
 			continue;
 		}
@@ -1104,7 +1103,7 @@ static int validate_kcore_modules(const char *kallsyms_filename,
 					     kallsyms_filename))
 		return -EINVAL;
 
-	if (do_validate_kcore_modules(modules_filename, map, kmaps))
+	if (do_validate_kcore_modules(modules_filename, kmaps))
 		return -EINVAL;
 
 	return 0;
-- 
1.9.1

  parent reply	other threads:[~2018-05-17  9:24 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-17  9:21 [PATCH V2 00/20] perf tools and x86 PTI entry trampolines Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 01/20] kallsyms: Simplify update_iter_mod() Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 02/20] kallsyms, x86: Export addresses of syscall trampolines Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 03/20] x86: Add entry trampolines to kcore Adrian Hunter
2018-05-17 17:52   ` Dave Hansen
2018-05-17 18:09     ` Arnaldo Carvalho de Melo
2018-05-17  9:21 ` [PATCH V2 04/20] x86: kcore: Give entry trampolines all the same offset in kcore Adrian Hunter
2018-05-17 17:54   ` Dave Hansen
2018-05-17  9:21 ` [PATCH V2 05/20] perf tools: Add machine__is() to identify machine arch Adrian Hunter
2018-05-19 11:47   ` [tip:perf/core] perf machine: " tip-bot for Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 06/20] perf tools: Fix kernel_start for PTI on x86 Adrian Hunter
2018-05-19 11:48   ` [tip:perf/core] " tip-bot for Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 07/20] perf tools: Add machine__nr_cpus_avail() Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 08/20] perf tools: Workaround missing maps for x86 PTI entry trampolines Adrian Hunter
2018-05-17  9:21 ` [PATCH V2 09/20] perf tools: Fix map_groups__split_kallsyms() for entry trampoline symbols Adrian Hunter
2018-05-17  9:21 ` Adrian Hunter [this message]
2018-05-17  9:21 ` [PATCH V2 11/20] perf tools: Create maps for x86 PTI entry trampolines Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 12/20] perf tools: Synthesize and process mmap events " Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 13/20] perf buildid-cache: kcore_copy: Keep phdr data in a list Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 14/20] perf buildid-cache: kcore_copy: Keep a count of phdrs Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 15/20] perf buildid-cache: kcore_copy: Calculate offset from phnum Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 16/20] perf buildid-cache: kcore_copy: Layout sections Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 17/20] perf buildid-cache: kcore_copy: Iterate phdrs Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 18/20] perf buildid-cache: kcore_copy: Get rid of kernel_map Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 19/20] perf buildid-cache: kcore_copy: Copy x86 PTI entry trampoline sections Adrian Hunter
2018-05-17  9:22 ` [PATCH V2 20/20] perf buildid-cache: kcore_copy: Amend the offset of sections that remap kernel text Adrian Hunter

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