perf symbols: Remove perf_session usage in symbols layer

I noticed while writing the first test in 'perf regtest' that to
just test the symbol handling routines one needs to create a
perf session, that is a layer centered on a perf.data file,
events, etc, so I untied these layers.

This reduces the complexity for the users as the number of
parameters to most of the symbols and session APIs now was
reduced while not adding more state to all the map instances by
only having data that is needed to split the kernel (kallsyms
and ELF symtab sections) maps and do vmlinux relocation on the
main kernel map.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1265223128-11786-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 24 insertions, 11 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index cf91d099f0aa..aa8a03120bbd 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -53,6 +53,11 @@ out_close:
 	return -1;
 }
 
+static inline int perf_session__create_kernel_maps(struct perf_session *self)
+{
+	return map_groups__create_kernel_maps(&self->kmaps, self->vmlinux_maps);
+}
+
 struct perf_session *perf_session__new(const char *filename, int mode, bool force)
 {
 	size_t len = filename ? strlen(filename) + 1 : 0;
@@ -507,6 +512,7 @@ int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
 					     u64 addr)
 {
 	char *bracket;
+	enum map_type i;
 
 	self->ref_reloc_sym.name = strdup(symbol_name);
 	if (self->ref_reloc_sym.name == NULL)
@@ -517,6 +523,12 @@ int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
 		*bracket = '\0';
 
 	self->ref_reloc_sym.addr = addr;
+
+	for (i = 0; i < MAP__NR_TYPES; ++i) {
+		struct kmap *kmap = map__kmap(self->vmlinux_maps[i]);
+		kmap->ref_reloc_sym = &self->ref_reloc_sym;
+	}
+
 	return 0;
 }
 
@@ -530,20 +542,21 @@ static u64 map__reloc_unmap_ip(struct map *map, u64 ip)
 	return ip - (s64)map->pgoff;
 }
 
-void perf_session__reloc_vmlinux_maps(struct perf_session *self,
-				      u64 unrelocated_addr)
+void map__reloc_vmlinux(struct map *self)
 {
-	enum map_type type;
-	s64 reloc = unrelocated_addr - self->ref_reloc_sym.addr;
+	struct kmap *kmap = map__kmap(self);
+	s64 reloc;
 
-	if (!reloc)
+	if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->unrelocated_addr)
 		return;
 
-	for (type = 0; type < MAP__NR_TYPES; ++type) {
-		struct map *map = self->vmlinux_maps[type];
+	reloc = (kmap->ref_reloc_sym->unrelocated_addr -
+		 kmap->ref_reloc_sym->addr);
 
-		map->map_ip = map__reloc_map_ip;
-		map->unmap_ip = map__reloc_unmap_ip;
-		map->pgoff = reloc;
-	}
+	if (!reloc)
+		return;
+
+	self->map_ip   = map__reloc_map_ip;
+	self->unmap_ip = map__reloc_unmap_ip;
+	self->pgoff    = reloc;
 }