perf lock: Move common lock contention code to new file

Avoid references from util code to builtin-lock that require python
stubs. Move the functions and related variables to
util/lock-contention.c. Add max_stack_depth parameter to
match_callstack_filter to avoid sharing a global variable.

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Veronika Molnarova <vmolnaro@redhat.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Link: https://lore.kernel.org/r/20241119011644.971342-16-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 1 insertions, 136 deletions

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 062e2b56a2ab5..f66948b1fbed9 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -46,15 +46,6 @@
 static struct perf_session *session;
 static struct target target;
 
-/* based on kernel/lockdep.c */
-#define LOCKHASH_BITS		12
-#define LOCKHASH_SIZE		(1UL << LOCKHASH_BITS)
-
-static struct hlist_head *lockhash_table;
-
-#define __lockhashfn(key)	hash_long((unsigned long)key, LOCKHASH_BITS)
-#define lockhashentry(key)	(lockhash_table + __lockhashfn((key)))
-
 static struct rb_root		thread_stats;
 
 static bool combine_locks;
@@ -67,24 +58,13 @@ static unsigned long bpf_map_entries = MAX_ENTRIES;
 static int max_stack_depth = CONTENTION_STACK_DEPTH;
 static int stack_skip = CONTENTION_STACK_SKIP;
 static int print_nr_entries = INT_MAX / 2;
-static LIST_HEAD(callstack_filters);
 static const char *output_name = NULL;
 static FILE *lock_output;
 
-struct callstack_filter {
-	struct list_head list;
-	char name[];
-};
-
 static struct lock_filter filters;
 
 static enum lock_aggr_mode aggr_mode = LOCK_AGGR_ADDR;
 
-static bool needs_callstack(void)
-{
-	return !list_empty(&callstack_filters);
-}
-
 static struct thread_stat *thread_stat_find(u32 tid)
 {
 	struct rb_node *node;
@@ -477,93 +457,6 @@ static struct lock_stat *pop_from_result(void)
 	return container_of(node, struct lock_stat, rb);
 }
 
-struct lock_stat *lock_stat_find(u64 addr)
-{
-	struct hlist_head *entry = lockhashentry(addr);
-	struct lock_stat *ret;
-
-	hlist_for_each_entry(ret, entry, hash_entry) {
-		if (ret->addr == addr)
-			return ret;
-	}
-	return NULL;
-}
-
-struct lock_stat *lock_stat_findnew(u64 addr, const char *name, int flags)
-{
-	struct hlist_head *entry = lockhashentry(addr);
-	struct lock_stat *ret, *new;
-
-	hlist_for_each_entry(ret, entry, hash_entry) {
-		if (ret->addr == addr)
-			return ret;
-	}
-
-	new = zalloc(sizeof(struct lock_stat));
-	if (!new)
-		goto alloc_failed;
-
-	new->addr = addr;
-	new->name = strdup(name);
-	if (!new->name) {
-		free(new);
-		goto alloc_failed;
-	}
-
-	new->flags = flags;
-	new->wait_time_min = ULLONG_MAX;
-
-	hlist_add_head(&new->hash_entry, entry);
-	return new;
-
-alloc_failed:
-	pr_err("memory allocation failed\n");
-	return NULL;
-}
-
-bool match_callstack_filter(struct machine *machine, u64 *callstack)
-{
-	struct map *kmap;
-	struct symbol *sym;
-	u64 ip;
-	const char *arch = perf_env__arch(machine->env);
-
-	if (list_empty(&callstack_filters))
-		return true;
-
-	for (int i = 0; i < max_stack_depth; i++) {
-		struct callstack_filter *filter;
-
-		/*
-		 * In powerpc, the callchain saved by kernel always includes
-		 * first three entries as the NIP (next instruction pointer),
-		 * LR (link register), and the contents of LR save area in the
-		 * second stack frame. In certain scenarios its possible to have
-		 * invalid kernel instruction addresses in either LR or the second
-		 * stack frame's LR. In that case, kernel will store that address as
-		 * zero.
-		 *
-		 * The below check will continue to look into callstack,
-		 * incase first or second callstack index entry has 0
-		 * address for powerpc.
-		 */
-		if (!callstack || (!callstack[i] && (strcmp(arch, "powerpc") ||
-						(i != 1 && i != 2))))
-			break;
-
-		ip = callstack[i];
-		sym = machine__find_kernel_symbol(machine, ip, &kmap);
-		if (sym == NULL)
-			continue;
-
-		list_for_each_entry(filter, &callstack_filters, list) {
-			if (strstr(sym->name, filter->name))
-				return true;
-		}
-	}
-	return false;
-}
-
 struct trace_lock_handler {
 	/* it's used on CONFIG_LOCKDEP */
 	int (*acquire_event)(struct evsel *evsel,
@@ -1165,7 +1058,7 @@ static int report_lock_contention_begin_event(struct evsel *evsel,
 		if (callstack == NULL)
 			return -ENOMEM;
 
-		if (!match_callstack_filter(machine, callstack)) {
+		if (!match_callstack_filter(machine, callstack, max_stack_depth)) {
 			free(callstack);
 			return 0;
 		}
@@ -2449,34 +2342,6 @@ static int parse_lock_addr(const struct option *opt __maybe_unused, const char *
 	return ret;
 }
 
-static int parse_call_stack(const struct option *opt __maybe_unused, const char *str,
-			   int unset __maybe_unused)
-{
-	char *s, *tmp, *tok;
-	int ret = 0;
-
-	s = strdup(str);
-	if (s == NULL)
-		return -1;
-
-	for (tok = strtok_r(s, ", ", &tmp); tok; tok = strtok_r(NULL, ", ", &tmp)) {
-		struct callstack_filter *entry;
-
-		entry = malloc(sizeof(*entry) + strlen(tok) + 1);
-		if (entry == NULL) {
-			pr_err("Memory allocation failure\n");
-			free(s);
-			return -1;
-		}
-
-		strcpy(entry->name, tok);
-		list_add_tail(&entry->list, &callstack_filters);
-	}
-
-	free(s);
-	return ret;
-}
-
 static int parse_output(const struct option *opt __maybe_unused, const char *str,
 			int unset __maybe_unused)
 {