tools/perf/builtin-test.c - kernel/msm - Gitiles

 /*
  * builtin-test.c
  *
  * Builtin regression testing command: ever growing number of sanity tests
  */
 #include "builtin.h"

 #include "util/cache.h"
 #include "util/debug.h"
 #include "util/parse-options.h"
 #include "util/session.h"
 #include "util/symbol.h"
 #include "util/thread.h"

 static long page_size;

 static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
 {
 	bool *visited = symbol__priv(sym);
 	*visited = true;
 	return 0;
 }

 static int test__vmlinux_matches_kallsyms(void)
 {
 	int err = -1;
 	struct rb_node *nd;
 	struct symbol *sym;
 	struct map *kallsyms_map, *vmlinux_map;
 	struct machine kallsyms, vmlinux;
 	enum map_type type = MAP__FUNCTION;
 	struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };

 	/*
 	 * Step 1:
 	 *
 	 * Init the machines that will hold kernel, modules obtained from
 	 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
 	 */
 	machine__init(&kallsyms, "", HOST_KERNEL_ID);
 	machine__init(&vmlinux, "", HOST_KERNEL_ID);

 	/*
 	 * Step 2:
 	 *
 	 * Create the kernel maps for kallsyms and the DSO where we will then
 	 * load /proc/kallsyms. Also create the modules maps from /proc/modules
 	 * and find the .ko files that match them in /lib/modules/`uname -r`/.
 	 */
 	if (machine__create_kernel_maps(&kallsyms) < 0) {
 		pr_debug("machine__create_kernel_maps ");
 		return -1;
 	}

 	/*
 	 * Step 3:
 	 *
 	 * Load and split /proc/kallsyms into multiple maps, one per module.
 	 */
 	if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
 		pr_debug("dso__load_kallsyms ");
 		goto out;
 	}

 	/*
 	 * Step 4:
 	 *
 	 * kallsyms will be internally on demand sorted by name so that we can
 	 * find the reference relocation * symbol, i.e. the symbol we will use
 	 * to see if the running kernel was relocated by checking if it has the
 	 * same value in the vmlinux file we load.
 	 */
 	kallsyms_map = machine__kernel_map(&kallsyms, type);

 	sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
 	if (sym == NULL) {
 		pr_debug("dso__find_symbol_by_name ");
 		goto out;
 	}

 	ref_reloc_sym.addr = sym->start;

 	/*
 	 * Step 5:
 	 *
 	 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
 	 */
 	if (machine__create_kernel_maps(&vmlinux) < 0) {
 		pr_debug("machine__create_kernel_maps ");
 		goto out;
 	}

 	vmlinux_map = machine__kernel_map(&vmlinux, type);
 	map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;

 	/*
 	 * Step 6:
 	 *
 	 * Locate a vmlinux file in the vmlinux path that has a buildid that
 	 * matches the one of the running kernel.
 	 *
 	 * While doing that look if we find the ref reloc symbol, if we find it
 	 * we'll have its ref_reloc_symbol.unrelocated_addr and then
 	 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
 	 * to fixup the symbols.
 	 */
 	if (machine__load_vmlinux_path(&vmlinux, type,
 				       vmlinux_matches_kallsyms_filter) <= 0) {
 		pr_debug("machine__load_vmlinux_path ");
 		goto out;
 	}

 	err = 0;
 	/*
 	 * Step 7:
 	 *
 	 * Now look at the symbols in the vmlinux DSO and check if we find all of them
 	 * in the kallsyms dso. For the ones that are in both, check its names and
 	 * end addresses too.
 	 */
 	for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
 		struct symbol *pair, *first_pair;
 		bool backwards = true;

 		sym  = rb_entry(nd, struct symbol, rb_node);

 		if (sym->start == sym->end)
 			continue;

 		first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
 		pair = first_pair;

 		if (pair && pair->start == sym->start) {
 next_pair:
 			if (strcmp(sym->name, pair->name) == 0) {
 				/*
 				 * kallsyms don't have the symbol end, so we
 				 * set that by using the next symbol start - 1,
 				 * in some cases we get this up to a page
 				 * wrong, trace_kmalloc when I was developing
 				 * this code was one such example, 2106 bytes
 				 * off the real size. More than that and we
 				 * _really_ have a problem.
 				 */
 				s64 skew = sym->end - pair->end;
 				if (llabs(skew) < page_size)
 					continue;

 				pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
 					 sym->start, sym->name, sym->end, pair->end);
 			} else {
 				struct rb_node *nnd;
 detour:
 				nnd = backwards ? rb_prev(&pair->rb_node) :
 						  rb_next(&pair->rb_node);
 				if (nnd) {
 					struct symbol *next = rb_entry(nnd, struct symbol, rb_node);

 					if (next->start == sym->start) {
 						pair = next;
 						goto next_pair;
 					}
 				}

 				if (backwards) {
 					backwards = false;
 					pair = first_pair;
 					goto detour;
 				}

 				pr_debug("%#Lx: diff name v: %s k: %s\n",
 					 sym->start, sym->name, pair->name);
 			}
 		} else
 			pr_debug("%#Lx: %s not on kallsyms\n", sym->start, sym->name);

 		err = -1;
 	}

 	if (!verbose)
 		goto out;

 	pr_info("Maps only in vmlinux:\n");

 	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
 		struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
 		/*
 		 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
 		 * the kernel will have the path for the vmlinux file being used,
 		 * so use the short name, less descriptive but the same ("[kernel]" in
 		 * both cases.
 		 */
 		pair = map_groups__find_by_name(&kallsyms.kmaps, type,
 						(pos->dso->kernel ?
 							pos->dso->short_name :
 							pos->dso->name));
 		if (pair)
 			pair->priv = 1;
 		else
 			map__fprintf(pos, stderr);
 	}

 	pr_info("Maps in vmlinux with a different name in kallsyms:\n");

 	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
 		struct map *pos = rb_entry(nd, struct map, rb_node), *pair;

 		pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
 		if (pair == NULL || pair->priv)
 			continue;

 		if (pair->start == pos->start) {
 			pair->priv = 1;
 			pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
 				pos->start, pos->end, pos->pgoff, pos->dso->name);
 			if (pos->pgoff != pair->pgoff || pos->end != pair->end)
 				pr_info(": \n*%Lx-%Lx %Lx",
 					pair->start, pair->end, pair->pgoff);
 			pr_info(" %s\n", pair->dso->name);
 			pair->priv = 1;
 		}
 	}

 	pr_info("Maps only in kallsyms:\n");

 	for (nd = rb_first(&kallsyms.kmaps.maps[type]);
 	     nd; nd = rb_next(nd)) {
 		struct map *pos = rb_entry(nd, struct map, rb_node);

 		if (!pos->priv)
 			map__fprintf(pos, stderr);
 	}
 out:
 	return err;
 }

 #include "util/evsel.h"
 #include <sys/types.h>

 static int trace_event__id(const char *event_name)
 {
 	char *filename;
 	int err = -1, fd;

 	if (asprintf(&filename,
 		     "/sys/kernel/debug/tracing/events/syscalls/%s/id",
 		     event_name) < 0)
 		return -1;

 	fd = open(filename, O_RDONLY);
 	if (fd >= 0) {
 		char id[16];
 		if (read(fd, id, sizeof(id)) > 0)
 			err = atoi(id);
 		close(fd);
 	}

 	free(filename);
 	return err;
 }

 static int test__open_syscall_event(void)
 {
 	int err = -1, fd;
 	struct thread_map *threads;
 	struct perf_evsel *evsel;
 	struct perf_event_attr attr;
 	unsigned int nr_open_calls = 111, i;
 	int id = trace_event__id("sys_enter_open");

 	if (id < 0) {
 		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
 		return -1;
 	}

 	threads = thread_map__new(-1, getpid());
 	if (threads == NULL) {
 		pr_debug("thread_map__new\n");
 		return -1;
 	}

 	memset(&attr, 0, sizeof(attr));
 	attr.type = PERF_TYPE_TRACEPOINT;
 	attr.config = id;
 	evsel = perf_evsel__new(&attr, 0);
 	if (evsel == NULL) {
 		pr_debug("perf_evsel__new\n");
 		goto out_thread_map_delete;
 	}

 	if (perf_evsel__open_per_thread(evsel, threads) < 0) {
 		pr_debug("failed to open counter: %s, "
 			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
 			 strerror(errno));
 		goto out_evsel_delete;
 	}

 	for (i = 0; i < nr_open_calls; ++i) {
 		fd = open("/etc/passwd", O_RDONLY);
 		close(fd);
 	}

 	if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
 		pr_debug("perf_evsel__open_read_on_cpu\n");
 		goto out_close_fd;
 	}

 	if (evsel->counts->cpu[0].val != nr_open_calls) {
 		pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld\n",
 			 nr_open_calls, evsel->counts->cpu[0].val);
 		goto out_close_fd;
 	}

 	err = 0;
 out_close_fd:
 	perf_evsel__close_fd(evsel, 1, threads->nr);
 out_evsel_delete:
 	perf_evsel__delete(evsel);
 out_thread_map_delete:
 	thread_map__delete(threads);
 	return err;
 }

 static struct test {
 	const char *desc;
 	int (*func)(void);
 } tests[] = {
 	{
 		.desc = "vmlinux symtab matches kallsyms",
 		.func = test__vmlinux_matches_kallsyms,
 	},
 	{
 		.desc = "detect open syscall event",
 		.func = test__open_syscall_event,
 	},
 	{
 		.func = NULL,
 	},
 };

 static int __cmd_test(void)
 {
 	int i = 0;

 	page_size = sysconf(_SC_PAGE_SIZE);

 	while (tests[i].func) {
 		int err;
 		pr_info("%2d: %s:", i + 1, tests[i].desc);
 		pr_debug("\n--- start ---\n");
 		err = tests[i].func();
 		pr_debug("---- end ----\n%s:", tests[i].desc);
 		pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
 		++i;
 	}

 	return 0;
 }

 static const char * const test_usage[] = {
 	"perf test [<options>]",
 	NULL,
 };

 static const struct option test_options[] = {
 	OPT_INTEGER('v', "verbose", &verbose,
 		    "be more verbose (show symbol address, etc)"),
 	OPT_END()
 };

 int cmd_test(int argc, const char **argv, const char *prefix __used)
 {
 	argc = parse_options(argc, argv, test_options, test_usage, 0);
 	if (argc)
 		usage_with_options(test_usage, test_options);

 	symbol_conf.priv_size = sizeof(int);
 	symbol_conf.sort_by_name = true;
 	symbol_conf.try_vmlinux_path = true;

 	if (symbol__init() < 0)
 		return -1;

 	setup_pager();

 	return __cmd_test();
 }
	/*
	* builtin-test.c
	*
	* Builtin regression testing command: ever growing number of sanity tests
	*/
	#include "builtin.h"

	#include "util/cache.h"
	#include "util/debug.h"
	#include "util/parse-options.h"
	#include "util/session.h"
	#include "util/symbol.h"
	#include "util/thread.h"

	static long page_size;

	static int vmlinux_matches_kallsyms_filter(struct map map __used, struct symbol sym)
	{
	bool *visited = symbol__priv(sym);
	*visited = true;
	return 0;
	}

	static int test__vmlinux_matches_kallsyms(void)
	{
	int err = -1;
	struct rb_node *nd;
	struct symbol *sym;
	struct map kallsyms_map, vmlinux_map;
	struct machine kallsyms, vmlinux;
	enum map_type type = MAP__FUNCTION;
	struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };

	/*
	* Step 1:
	*
	* Init the machines that will hold kernel, modules obtained from
	* both vmlinux + .ko files and from /proc/kallsyms split by modules.
	*/
	machine__init(&kallsyms, "", HOST_KERNEL_ID);
	machine__init(&vmlinux, "", HOST_KERNEL_ID);

	/*
	* Step 2:
	*
	* Create the kernel maps for kallsyms and the DSO where we will then
	* load /proc/kallsyms. Also create the modules maps from /proc/modules
	* and find the .ko files that match them in /lib/modules/`uname -r`/.
	*/
	if (machine__create_kernel_maps(&kallsyms) < 0) {
	pr_debug("machine__create_kernel_maps ");
	return -1;
	}

	/*
	* Step 3:
	*
	* Load and split /proc/kallsyms into multiple maps, one per module.
	*/
	if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
	pr_debug("dso__load_kallsyms ");
	goto out;
	}

	/*
	* Step 4:
	*
	* kallsyms will be internally on demand sorted by name so that we can
	* find the reference relocation * symbol, i.e. the symbol we will use
	* to see if the running kernel was relocated by checking if it has the
	* same value in the vmlinux file we load.
	*/
	kallsyms_map = machine__kernel_map(&kallsyms, type);

	sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
	if (sym == NULL) {
	pr_debug("dso__find_symbol_by_name ");
	goto out;
	}

	ref_reloc_sym.addr = sym->start;

	/*
	* Step 5:
	*
	* Now repeat step 2, this time for the vmlinux file we'll auto-locate.
	*/
	if (machine__create_kernel_maps(&vmlinux) < 0) {
	pr_debug("machine__create_kernel_maps ");
	goto out;
	}

	vmlinux_map = machine__kernel_map(&vmlinux, type);
	map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;

	/*
	* Step 6:
	*
	* Locate a vmlinux file in the vmlinux path that has a buildid that
	* matches the one of the running kernel.
	*
	* While doing that look if we find the ref reloc symbol, if we find it
	* we'll have its ref_reloc_symbol.unrelocated_addr and then
	* maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
	* to fixup the symbols.
	*/
	if (machine__load_vmlinux_path(&vmlinux, type,
	vmlinux_matches_kallsyms_filter) <= 0) {
	pr_debug("machine__load_vmlinux_path ");
	goto out;
	}

	err = 0;
	/*
	* Step 7:
	*
	* Now look at the symbols in the vmlinux DSO and check if we find all of them
	* in the kallsyms dso. For the ones that are in both, check its names and
	* end addresses too.
	*/
	for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
	struct symbol pair, first_pair;
	bool backwards = true;

	sym = rb_entry(nd, struct symbol, rb_node);

	if (sym->start == sym->end)
	continue;

	first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
	pair = first_pair;

	if (pair && pair->start == sym->start) {
	next_pair:
	if (strcmp(sym->name, pair->name) == 0) {
	/*
	* kallsyms don't have the symbol end, so we
	* set that by using the next symbol start - 1,
	* in some cases we get this up to a page
	* wrong, trace_kmalloc when I was developing
	* this code was one such example, 2106 bytes
	* off the real size. More than that and we
	* _really_ have a problem.
	*/
	s64 skew = sym->end - pair->end;
	if (llabs(skew) < page_size)
	continue;

	pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
	sym->start, sym->name, sym->end, pair->end);
	} else {
	struct rb_node *nnd;
	detour:
	nnd = backwards ? rb_prev(&pair->rb_node) :
	rb_next(&pair->rb_node);
	if (nnd) {
	struct symbol *next = rb_entry(nnd, struct symbol, rb_node);

	if (next->start == sym->start) {
	pair = next;
	goto next_pair;
	}
	}

	if (backwards) {
	backwards = false;
	pair = first_pair;
	goto detour;
	}

	pr_debug("%#Lx: diff name v: %s k: %s\n",
	sym->start, sym->name, pair->name);
	}
	} else
	pr_debug("%#Lx: %s not on kallsyms\n", sym->start, sym->name);

	err = -1;
	}

	if (!verbose)
	goto out;

	pr_info("Maps only in vmlinux:\n");

	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
	struct map pos = rb_entry(nd, struct map, rb_node), pair;
	/*
	* If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
	* the kernel will have the path for the vmlinux file being used,
	* so use the short name, less descriptive but the same ("[kernel]" in
	* both cases.
	*/
	pair = map_groups__find_by_name(&kallsyms.kmaps, type,
	(pos->dso->kernel ?
	pos->dso->short_name :
	pos->dso->name));
	if (pair)
	pair->priv = 1;
	else
	map__fprintf(pos, stderr);
	}

	pr_info("Maps in vmlinux with a different name in kallsyms:\n");

	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
	struct map pos = rb_entry(nd, struct map, rb_node), pair;

	pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
	if (pair == NULL \|\| pair->priv)
	continue;

	if (pair->start == pos->start) {
	pair->priv = 1;
	pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
	pos->start, pos->end, pos->pgoff, pos->dso->name);
	if (pos->pgoff != pair->pgoff \|\| pos->end != pair->end)
	pr_info(": \n*%Lx-%Lx %Lx",
	pair->start, pair->end, pair->pgoff);
	pr_info(" %s\n", pair->dso->name);
	pair->priv = 1;
	}
	}

	pr_info("Maps only in kallsyms:\n");

	for (nd = rb_first(&kallsyms.kmaps.maps[type]);
	nd; nd = rb_next(nd)) {
	struct map *pos = rb_entry(nd, struct map, rb_node);

	if (!pos->priv)
	map__fprintf(pos, stderr);
	}
	out:
	return err;
	}

	#include "util/evsel.h"
	#include <sys/types.h>

	static int trace_event__id(const char *event_name)
	{
	char *filename;
	int err = -1, fd;

	if (asprintf(&filename,
	"/sys/kernel/debug/tracing/events/syscalls/%s/id",
	event_name) < 0)
	return -1;

	fd = open(filename, O_RDONLY);
	if (fd >= 0) {
	char id[16];
	if (read(fd, id, sizeof(id)) > 0)
	err = atoi(id);
	close(fd);
	}

	free(filename);
	return err;
	}

	static int test__open_syscall_event(void)
	{
	int err = -1, fd;
	struct thread_map *threads;
	struct perf_evsel *evsel;
	struct perf_event_attr attr;
	unsigned int nr_open_calls = 111, i;
	int id = trace_event__id("sys_enter_open");

	if (id < 0) {
	pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
	return -1;
	}

	threads = thread_map__new(-1, getpid());
	if (threads == NULL) {
	pr_debug("thread_map__new\n");
	return -1;
	}

	memset(&attr, 0, sizeof(attr));
	attr.type = PERF_TYPE_TRACEPOINT;
	attr.config = id;
	evsel = perf_evsel__new(&attr, 0);
	if (evsel == NULL) {
	pr_debug("perf_evsel__new\n");
	goto out_thread_map_delete;
	}

	if (perf_evsel__open_per_thread(evsel, threads) < 0) {
	pr_debug("failed to open counter: %s, "
	"tweak /proc/sys/kernel/perf_event_paranoid?\n",
	strerror(errno));
	goto out_evsel_delete;
	}

	for (i = 0; i < nr_open_calls; ++i) {
	fd = open("/etc/passwd", O_RDONLY);
	close(fd);
	}

	if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
	pr_debug("perf_evsel__open_read_on_cpu\n");
	goto out_close_fd;
	}

	if (evsel->counts->cpu[0].val != nr_open_calls) {
	pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld\n",
	nr_open_calls, evsel->counts->cpu[0].val);
	goto out_close_fd;
	}

	err = 0;
	out_close_fd:
	perf_evsel__close_fd(evsel, 1, threads->nr);
	out_evsel_delete:
	perf_evsel__delete(evsel);
	out_thread_map_delete:
	thread_map__delete(threads);
	return err;
	}

	static struct test {
	const char *desc;
	int (*func)(void);
	} tests[] = {
	{
	.desc = "vmlinux symtab matches kallsyms",
	.func = test__vmlinux_matches_kallsyms,
	},
	{
	.desc = "detect open syscall event",
	.func = test__open_syscall_event,
	},
	{
	.func = NULL,
	},
	};

	static int __cmd_test(void)
	{
	int i = 0;

	page_size = sysconf(_SC_PAGE_SIZE);

	while (tests[i].func) {
	int err;
	pr_info("%2d: %s:", i + 1, tests[i].desc);
	pr_debug("\n--- start ---\n");
	err = tests[i].func();
	pr_debug("---- end ----\n%s:", tests[i].desc);
	pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
	++i;
	}

	return 0;
	}

	static const char * const test_usage[] = {
	"perf test [<options>]",
	NULL,
	};

	static const struct option test_options[] = {
	OPT_INTEGER('v', "verbose", &verbose,
	"be more verbose (show symbol address, etc)"),
	OPT_END()
	};

	int cmd_test(int argc, const char *argv, const char prefix __used)
	{
	argc = parse_options(argc, argv, test_options, test_usage, 0);
	if (argc)
	usage_with_options(test_usage, test_options);

	symbol_conf.priv_size = sizeof(int);
	symbol_conf.sort_by_name = true;
	symbol_conf.try_vmlinux_path = true;

	if (symbol__init() < 0)
	return -1;

	setup_pager();

	return __cmd_test();
	}