perf probe: Fix add event failure when running 32-bit perf in a 64-bit kernel

The "address" member of "struct probe_trace_point" uses long data type.
If kernel is 64-bit and perf program is 32-bit, size of "address"
variable is 32 bits.

As a result, upper 32 bits of address read from kernel are truncated, an
error occurs during address comparison in kprobe_warn_out_range().

Before:

  # perf probe -a schedule
  schedule is out of .text, skip it.
    Error: Failed to add events.

Solution:
  Change data type of "address" variable to u64 and change corresponding
address printing and value assignment.

After:

  # perf.new.new probe -a schedule
  Added new event:
    probe:schedule       (on schedule)

  You can now use it in all perf tools, such as:

          perf record -e probe:schedule -aR sleep 1

  # perf probe -l
    probe:schedule       (on schedule@kernel/sched/core.c)
  # perf record -e probe:schedule -aR sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.156 MB perf.data (1366 samples) ]
  # perf report --stdio
  # To display the perf.data header info, please use --header/--header-only options.
  #
  #
  # Total Lost Samples: 0
  #
  # Samples: 1K of event 'probe:schedule'
  # Event count (approx.): 1366
  #
  # Overhead  Command          Shared Object      Symbol
  # ........  ...............  .................  ............
  #
       6.22%  migration/0      [kernel.kallsyms]  [k] schedule
       6.22%  migration/1      [kernel.kallsyms]  [k] schedule
       6.22%  migration/2      [kernel.kallsyms]  [k] schedule
       6.22%  migration/3      [kernel.kallsyms]  [k] schedule
       6.15%  migration/10     [kernel.kallsyms]  [k] schedule
       6.15%  migration/11     [kernel.kallsyms]  [k] schedule
       6.15%  migration/12     [kernel.kallsyms]  [k] schedule
       6.15%  migration/13     [kernel.kallsyms]  [k] schedule
       6.15%  migration/14     [kernel.kallsyms]  [k] schedule
       6.15%  migration/15     [kernel.kallsyms]  [k] schedule
       6.15%  migration/4      [kernel.kallsyms]  [k] schedule
       6.15%  migration/5      [kernel.kallsyms]  [k] schedule
       6.15%  migration/6      [kernel.kallsyms]  [k] schedule
       6.15%  migration/7      [kernel.kallsyms]  [k] schedule
       6.15%  migration/8      [kernel.kallsyms]  [k] schedule
       6.15%  migration/9      [kernel.kallsyms]  [k] schedule
       0.22%  rcu_sched        [kernel.kallsyms]  [k] schedule
  ...
  #
  # (Cannot load tips.txt file, please install perf!)
  #

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jianlin Lv <jianlin.lv@arm.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Li Huafei <lihuafei1@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lore.kernel.org/lkml/20210715063723.11926-1-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 23 insertions, 26 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index e05750cea34c..b2a02c9ab8ea 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -239,8 +239,8 @@ static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs)
 		clear_probe_trace_event(tevs + i);
 }
 
-static bool kprobe_blacklist__listed(unsigned long address);
-static bool kprobe_warn_out_range(const char *symbol, unsigned long address)
+static bool kprobe_blacklist__listed(u64 address);
+static bool kprobe_warn_out_range(const char *symbol, u64 address)
 {
 	struct map *map;
 	bool ret = false;
@@ -400,8 +400,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
 	pr_debug("Symbol %s address found : %" PRIx64 "\n",
 			pp->function, address);
 
-	ret = debuginfo__find_probe_point(dinfo, (unsigned long)address,
-					  result);
+	ret = debuginfo__find_probe_point(dinfo, address, result);
 	if (ret <= 0)
 		ret = (!ret) ? -ENOENT : ret;
 	else {
@@ -589,7 +588,7 @@ static void debuginfo_cache__exit(void)
 }
 
 
-static int get_text_start_address(const char *exec, unsigned long *address,
+static int get_text_start_address(const char *exec, u64 *address,
 				  struct nsinfo *nsi)
 {
 	Elf *elf;
@@ -634,7 +633,7 @@ static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
 					    bool is_kprobe)
 {
 	struct debuginfo *dinfo = NULL;
-	unsigned long stext = 0;
+	u64 stext = 0;
 	u64 addr = tp->address;
 	int ret = -ENOENT;
 
@@ -662,8 +661,7 @@ static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
 
 	dinfo = debuginfo_cache__open(tp->module, verbose <= 0);
 	if (dinfo)
-		ret = debuginfo__find_probe_point(dinfo,
-						 (unsigned long)addr, pp);
+		ret = debuginfo__find_probe_point(dinfo, addr, pp);
 	else
 		ret = -ENOENT;
 
@@ -678,7 +676,7 @@ error:
 
 /* Adjust symbol name and address */
 static int post_process_probe_trace_point(struct probe_trace_point *tp,
-					   struct map *map, unsigned long offs)
+					   struct map *map, u64 offs)
 {
 	struct symbol *sym;
 	u64 addr = tp->address - offs;
@@ -721,7 +719,7 @@ post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
 					int ntevs, const char *pathname)
 {
 	struct map *map;
-	unsigned long stext = 0;
+	u64 stext = 0;
 	int i, ret = 0;
 
 	/* Prepare a map for offline binary */
@@ -747,7 +745,7 @@ static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
 					  struct nsinfo *nsi)
 {
 	int i, ret = 0;
-	unsigned long stext = 0;
+	u64 stext = 0;
 
 	if (!exec)
 		return 0;
@@ -792,7 +790,7 @@ post_process_module_probe_trace_events(struct probe_trace_event *tevs,
 	mod_name = find_module_name(module);
 	for (i = 0; i < ntevs; i++) {
 		ret = post_process_probe_trace_point(&tevs[i].point,
-						map, (unsigned long)text_offs);
+						map, text_offs);
 		if (ret < 0)
 			break;
 		tevs[i].point.module =
@@ -1536,7 +1534,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 		 * so tmp[1] should always valid (but could be '\0').
 		 */
 		if (tmp && !strncmp(tmp, "0x", 2)) {
-			pp->abs_address = strtoul(pp->function, &tmp, 0);
+			pp->abs_address = strtoull(pp->function, &tmp, 0);
 			if (*tmp != '\0') {
 				semantic_error("Invalid absolute address.\n");
 				return -EINVAL;
@@ -1911,7 +1909,7 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
 			argv[i] = NULL;
 			argc -= 1;
 		} else
-			tp->address = strtoul(fmt1_str, NULL, 0);
+			tp->address = strtoull(fmt1_str, NULL, 0);
 	} else {
 		/* Only the symbol-based probe has offset */
 		tp->symbol = strdup(fmt1_str);
@@ -2157,7 +2155,7 @@ synthesize_uprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf)
 		return -EINVAL;
 
 	/* Use the tp->address for uprobes */
-	err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address);
+	err = strbuf_addf(buf, "%s:0x%" PRIx64, tp->module, tp->address);
 
 	if (err >= 0 && tp->ref_ctr_offset) {
 		if (!uprobe_ref_ctr_is_supported())
@@ -2172,7 +2170,7 @@ synthesize_kprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf)
 {
 	if (!strncmp(tp->symbol, "0x", 2)) {
 		/* Absolute address. See try_to_find_absolute_address() */
-		return strbuf_addf(buf, "%s%s0x%lx", tp->module ?: "",
+		return strbuf_addf(buf, "%s%s0x%" PRIx64, tp->module ?: "",
 				  tp->module ? ":" : "", tp->address);
 	} else {
 		return strbuf_addf(buf, "%s%s%s+%lu", tp->module ?: "",
@@ -2271,7 +2269,7 @@ static int convert_to_perf_probe_point(struct probe_trace_point *tp,
 		pp->function = strdup(tp->symbol);
 		pp->offset = tp->offset;
 	} else {
-		ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
+		ret = e_snprintf(buf, 128, "0x%" PRIx64, tp->address);
 		if (ret < 0)
 			return ret;
 		pp->function = strdup(buf);
@@ -2452,8 +2450,8 @@ void clear_probe_trace_event(struct probe_trace_event *tev)
 
 struct kprobe_blacklist_node {
 	struct list_head list;
-	unsigned long start;
-	unsigned long end;
+	u64 start;
+	u64 end;
 	char *symbol;
 };
 
@@ -2498,7 +2496,7 @@ static int kprobe_blacklist__load(struct list_head *blacklist)
 		}
 		INIT_LIST_HEAD(&node->list);
 		list_add_tail(&node->list, blacklist);
-		if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) {
+		if (sscanf(buf, "0x%" PRIx64 "-0x%" PRIx64, &node->start, &node->end) != 2) {
 			ret = -EINVAL;
 			break;
 		}
@@ -2514,7 +2512,7 @@ static int kprobe_blacklist__load(struct list_head *blacklist)
 			ret = -ENOMEM;
 			break;
 		}
-		pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n",
+		pr_debug2("Blacklist: 0x%" PRIx64 "-0x%" PRIx64 ", %s\n",
 			  node->start, node->end, node->symbol);
 		ret++;
 	}
@@ -2526,8 +2524,7 @@ static int kprobe_blacklist__load(struct list_head *blacklist)
 }
 
 static struct kprobe_blacklist_node *
-kprobe_blacklist__find_by_address(struct list_head *blacklist,
-				  unsigned long address)
+kprobe_blacklist__find_by_address(struct list_head *blacklist, u64 address)
 {
 	struct kprobe_blacklist_node *node;
 
@@ -2555,7 +2552,7 @@ static void kprobe_blacklist__release(void)
 	kprobe_blacklist__delete(&kprobe_blacklist);
 }
 
-static bool kprobe_blacklist__listed(unsigned long address)
+static bool kprobe_blacklist__listed(u64 address)
 {
 	return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address);
 }
@@ -3223,7 +3220,7 @@ static int try_to_find_absolute_address(struct perf_probe_event *pev,
 	 * In __add_probe_trace_events, a NULL symbol is interpreted as
 	 * invalid.
 	 */
-	if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0)
+	if (asprintf(&tp->symbol, "0x%" PRIx64, tp->address) < 0)
 		goto errout;
 
 	/* For kprobe, check range */
@@ -3234,7 +3231,7 @@ static int try_to_find_absolute_address(struct perf_probe_event *pev,
 		goto errout;
 	}
 
-	if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0)
+	if (asprintf(&tp->realname, "abs_%" PRIx64, tp->address) < 0)
 		goto errout;
 
 	if (pev->target) {