[linux-2.6-block.git] / tools / perf / tests / code-reading.c

#include <linux/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>

#include "parse-events.h"
#include "evlist.h"
#include "evsel.h"
#include "thread_map.h"
#include "cpumap.h"
#include "machine.h"
#include "event.h"
#include "thread.h"

#include "tests.h"

#define BUFSZ	1024
#define READLEN	128

struct state {
	u64 done[1024];
	size_t done_cnt;
};

static unsigned int hex(char c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	return c - 'A' + 10;
}

static void read_objdump_line(const char *line, size_t line_len, void **buf,
			      size_t *len)
{
	const char *p;
	size_t i;

	/* Skip to a colon */
	p = strchr(line, ':');
	if (!p)
		return;
	i = p + 1 - line;

	/* Read bytes */
	while (*len) {
		char c1, c2;

		/* Skip spaces */
		for (; i < line_len; i++) {
			if (!isspace(line[i]))
				break;
		}
		/* Get 2 hex digits */
		if (i >= line_len || !isxdigit(line[i]))
			break;
		c1 = line[i++];
		if (i >= line_len || !isxdigit(line[i]))
			break;
		c2 = line[i++];
		/* Followed by a space */
		if (i < line_len && line[i] && !isspace(line[i]))
			break;
		/* Store byte */
		*(unsigned char *)*buf = (hex(c1) << 4) | hex(c2);
		*buf += 1;
		*len -= 1;
	}
}

static int read_objdump_output(FILE *f, void **buf, size_t *len)
{
	char *line = NULL;
	size_t line_len;
	ssize_t ret;
	int err = 0;

	while (1) {
		ret = getline(&line, &line_len, f);
		if (feof(f))
			break;
		if (ret < 0) {
			pr_debug("getline failed\n");
			err = -1;
			break;
		}
		read_objdump_line(line, ret, buf, len);
	}

	free(line);

	return err;
}

static int read_via_objdump(const char *filename, u64 addr, void *buf,
			    size_t len)
{
	char cmd[PATH_MAX * 2];
	const char *fmt;
	FILE *f;
	int ret;

	fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
	ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
		       filename);
	if (ret <= 0 || (size_t)ret >= sizeof(cmd))
		return -1;

	pr_debug("Objdump command is: %s\n", cmd);

	/* Ignore objdump errors */
	strcat(cmd, " 2>/dev/null");

	f = popen(cmd, "r");
	if (!f) {
		pr_debug("popen failed\n");
		return -1;
	}

	ret = read_objdump_output(f, &buf, &len);
	if (len) {
		pr_debug("objdump read too few bytes\n");
		if (!ret)
			ret = len;
	}

	pclose(f);

	return ret;
}

static int read_object_code(u64 addr, size_t len, u8 cpumode,
			    struct thread *thread, struct machine *machine,
			    struct state *state)
{
	struct addr_location al;
	unsigned char buf1[BUFSZ];
	unsigned char buf2[BUFSZ];
	size_t ret_len;
	u64 objdump_addr;
	int ret;

	pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);

	thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION, addr,
			      &al);
	if (!al.map || !al.map->dso) {
		pr_debug("thread__find_addr_map failed\n");
		return -1;
	}

	pr_debug("File is: %s\n", al.map->dso->long_name);

	if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
	    !dso__is_kcore(al.map->dso)) {
		pr_debug("Unexpected kernel address - skipping\n");
		return 0;
	}

	pr_debug("On file address is: %#"PRIx64"\n", al.addr);

	if (len > BUFSZ)
		len = BUFSZ;

	/* Do not go off the map */
	if (addr + len > al.map->end)
		len = al.map->end - addr;

	/* Read the object code using perf */
	ret_len = dso__data_read_offset(al.map->dso, machine, al.addr, buf1,
					len);
	if (ret_len != len) {
		pr_debug("dso__data_read_offset failed\n");
		return -1;
	}

	/*
	 * Converting addresses for use by objdump requires more information.
	 * map__load() does that.  See map__rip_2objdump() for details.
	 */
	if (map__load(al.map, NULL))
		return -1;

	/* objdump struggles with kcore - try each map only once */
	if (dso__is_kcore(al.map->dso)) {
		size_t d;

		for (d = 0; d < state->done_cnt; d++) {
			if (state->done[d] == al.map->start) {
				pr_debug("kcore map tested already");
				pr_debug(" - skipping\n");
				return 0;
			}
		}
		if (state->done_cnt >= ARRAY_SIZE(state->done)) {
			pr_debug("Too many kcore maps - skipping\n");
			return 0;
		}
		state->done[state->done_cnt++] = al.map->start;
	}

	/* Read the object code using objdump */
	objdump_addr = map__rip_2objdump(al.map, al.addr);
	ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
	if (ret > 0) {
		/*
		 * The kernel maps are inaccurate - assume objdump is right in
		 * that case.
		 */
		if (cpumode == PERF_RECORD_MISC_KERNEL ||
		    cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
			len -= ret;
			if (len) {
				pr_debug("Reducing len to %zu\n", len);
			} else if (dso__is_kcore(al.map->dso)) {
				/*
				 * objdump cannot handle very large segments
				 * that may be found in kcore.
				 */
				pr_debug("objdump failed for kcore");
				pr_debug(" - skipping\n");
				return 0;
			} else {
				return -1;
			}
		}
	}
	if (ret < 0) {
		pr_debug("read_via_objdump failed\n");
		return -1;
	}

	/* The results should be identical */
	if (memcmp(buf1, buf2, len)) {
		pr_debug("Bytes read differ from those read by objdump\n");
		return -1;
	}
	pr_debug("Bytes read match those read by objdump\n");

	return 0;
}

static int process_sample_event(struct machine *machine,
				struct perf_evlist *evlist,
				union perf_event *event, struct state *state)
{
	struct perf_sample sample;
	struct thread *thread;
	u8 cpumode;

	if (perf_evlist__parse_sample(evlist, event, &sample)) {
		pr_debug("perf_evlist__parse_sample failed\n");
		return -1;
	}

	thread = machine__findnew_thread(machine, sample.pid, sample.pid);
	if (!thread) {
		pr_debug("machine__findnew_thread failed\n");
		return -1;
	}

	cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;

	return read_object_code(sample.ip, READLEN, cpumode, thread, machine,
				state);
}

static int process_event(struct machine *machine, struct perf_evlist *evlist,
			 union perf_event *event, struct state *state)
{
	if (event->header.type == PERF_RECORD_SAMPLE)
		return process_sample_event(machine, evlist, event, state);

	if (event->header.type == PERF_RECORD_THROTTLE ||
	    event->header.type == PERF_RECORD_UNTHROTTLE)
		return 0;

	if (event->header.type < PERF_RECORD_MAX) {
		int ret;

		ret = machine__process_event(machine, event, NULL);
		if (ret < 0)
			pr_debug("machine__process_event failed, event type %u\n",
				 event->header.type);
		return ret;
	}

	return 0;
}

static int process_events(struct machine *machine, struct perf_evlist *evlist,
			  struct state *state)
{
	union perf_event *event;
	int i, ret;

	for (i = 0; i < evlist->nr_mmaps; i++) {
		while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
			ret = process_event(machine, evlist, event, state);
			perf_evlist__mmap_consume(evlist, i);
			if (ret < 0)
				return ret;
		}
	}
	return 0;
}

static int comp(const void *a, const void *b)
{
	return *(int *)a - *(int *)b;
}

static void do_sort_something(void)
{
	int buf[40960], i;

	for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
		buf[i] = ARRAY_SIZE(buf) - i - 1;

	qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);

	for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
		if (buf[i] != i) {
			pr_debug("qsort failed\n");
			break;
		}
	}
}

static void sort_something(void)
{
	int i;

	for (i = 0; i < 10; i++)
		do_sort_something();
}

static void syscall_something(void)
{
	int pipefd[2];
	int i;

	for (i = 0; i < 1000; i++) {
		if (pipe(pipefd) < 0) {
			pr_debug("pipe failed\n");
			break;
		}
		close(pipefd[1]);
		close(pipefd[0]);
	}
}

static void fs_something(void)
{
	const char *test_file_name = "temp-perf-code-reading-test-file--";
	FILE *f;
	int i;

	for (i = 0; i < 1000; i++) {
		f = fopen(test_file_name, "w+");
		if (f) {
			fclose(f);
			unlink(test_file_name);
		}
	}
}

static void do_something(void)
{
	fs_something();

	sort_something();

	syscall_something();
}

enum {
	TEST_CODE_READING_OK,
	TEST_CODE_READING_NO_VMLINUX,
	TEST_CODE_READING_NO_KCORE,
	TEST_CODE_READING_NO_ACCESS,
	TEST_CODE_READING_NO_KERNEL_OBJ,
};

static int do_test_code_reading(bool try_kcore)
{
	struct machines machines;
	struct machine *machine;
	struct thread *thread;
	struct record_opts opts = {
		.mmap_pages	     = UINT_MAX,
		.user_freq	     = UINT_MAX,
		.user_interval	     = ULLONG_MAX,
		.freq		     = 4000,
		.target		     = {
			.uses_mmap   = true,
		},
	};
	struct state state = {
		.done_cnt = 0,
	};
	struct thread_map *threads = NULL;
	struct cpu_map *cpus = NULL;
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	int err = -1, ret;
	pid_t pid;
	struct map *map;
	bool have_vmlinux, have_kcore, excl_kernel = false;

	pid = getpid();

	machines__init(&machines);
	machine = &machines.host;

	ret = machine__create_kernel_maps(machine);
	if (ret < 0) {
		pr_debug("machine__create_kernel_maps failed\n");
		goto out_err;
	}

	/* Force the use of kallsyms instead of vmlinux to try kcore */
	if (try_kcore)
		symbol_conf.kallsyms_name = "/proc/kallsyms";

	/* Load kernel map */
	map = machine->vmlinux_maps[MAP__FUNCTION];
	ret = map__load(map, NULL);
	if (ret < 0) {
		pr_debug("map__load failed\n");
		goto out_err;
	}
	have_vmlinux = dso__is_vmlinux(map->dso);
	have_kcore = dso__is_kcore(map->dso);

	/* 2nd time through we just try kcore */
	if (try_kcore && !have_kcore)
		return TEST_CODE_READING_NO_KCORE;

	/* No point getting kernel events if there is no kernel object */
	if (!have_vmlinux && !have_kcore)
		excl_kernel = true;

	threads = thread_map__new_by_tid(pid);
	if (!threads) {
		pr_debug("thread_map__new_by_tid failed\n");
		goto out_err;
	}

	ret = perf_event__synthesize_thread_map(NULL, threads,
						perf_event__process, machine, false);
	if (ret < 0) {
		pr_debug("perf_event__synthesize_thread_map failed\n");
		goto out_err;
	}

	thread = machine__findnew_thread(machine, pid, pid);
	if (!thread) {
		pr_debug("machine__findnew_thread failed\n");
		goto out_err;
	}

	cpus = cpu_map__new(NULL);
	if (!cpus) {
		pr_debug("cpu_map__new failed\n");
		goto out_err;
	}

	while (1) {
		const char *str;

		evlist = perf_evlist__new();
		if (!evlist) {
			pr_debug("perf_evlist__new failed\n");
			goto out_err;
		}

		perf_evlist__set_maps(evlist, cpus, threads);

		if (excl_kernel)
			str = "cycles:u";
		else
			str = "cycles";
		pr_debug("Parsing event '%s'\n", str);
		ret = parse_events(evlist, str);
		if (ret < 0) {
			pr_debug("parse_events failed\n");
			goto out_err;
		}

		perf_evlist__config(evlist, &opts);

		evsel = perf_evlist__first(evlist);

		evsel->attr.comm = 1;
		evsel->attr.disabled = 1;
		evsel->attr.enable_on_exec = 0;

		ret = perf_evlist__open(evlist);
		if (ret < 0) {
			if (!excl_kernel) {
				excl_kernel = true;
				perf_evlist__set_maps(evlist, NULL, NULL);
				perf_evlist__delete(evlist);
				evlist = NULL;
				continue;
			}
			pr_debug("perf_evlist__open failed\n");
			goto out_err;
		}
		break;
	}

	ret = perf_evlist__mmap(evlist, UINT_MAX, false);
	if (ret < 0) {
		pr_debug("perf_evlist__mmap failed\n");
		goto out_err;
	}

	perf_evlist__enable(evlist);

	do_something();

	perf_evlist__disable(evlist);

	ret = process_events(machine, evlist, &state);
	if (ret < 0)
		goto out_err;

	if (!have_vmlinux && !have_kcore && !try_kcore)
		err = TEST_CODE_READING_NO_KERNEL_OBJ;
	else if (!have_vmlinux && !try_kcore)
		err = TEST_CODE_READING_NO_VMLINUX;
	else if (excl_kernel)
		err = TEST_CODE_READING_NO_ACCESS;
	else
		err = TEST_CODE_READING_OK;
out_err:
	if (evlist) {
		perf_evlist__delete(evlist);
	} else {
		cpu_map__delete(cpus);
		thread_map__delete(threads);
	}
	machines__destroy_kernel_maps(&machines);
	machine__delete_threads(machine);
	machines__exit(&machines);

	return err;
}

int test__code_reading(void)
{
	int ret;

	ret = do_test_code_reading(false);
	if (!ret)
		ret = do_test_code_reading(true);

	switch (ret) {
	case TEST_CODE_READING_OK:
		return 0;
	case TEST_CODE_READING_NO_VMLINUX:
		fprintf(stderr, " (no vmlinux)");
		return 0;
	case TEST_CODE_READING_NO_KCORE:
		fprintf(stderr, " (no kcore)");
		return 0;
	case TEST_CODE_READING_NO_ACCESS:
		fprintf(stderr, " (no access)");
		return 0;
	case TEST_CODE_READING_NO_KERNEL_OBJ:
		fprintf(stderr, " (no kernel obj)");
		return 0;
	default:
		return -1;
	};
}
Commit	Line	Data
d944c4ee	1	#include <linux/types.h>
b55ae0a9 AH	2	#include <stdlib.h>
	3	#include <unistd.h>
	4	#include <stdio.h>
b55ae0a9 AH	5	#include <ctype.h>
	6	#include <string.h>
	7
	8	#include "parse-events.h"
	9	#include "evlist.h"
	10	#include "evsel.h"
	11	#include "thread_map.h"
	12	#include "cpumap.h"
	13	#include "machine.h"
	14	#include "event.h"
	15	#include "thread.h"
	16
	17	#include "tests.h"
	18
	19	#define BUFSZ 1024
	20	#define READLEN 128
	21
7a77bc2c AH	22	struct state {
	23	u64 done[1024];
	24	size_t done_cnt;
	25	};
	26
b55ae0a9 AH	27	static unsigned int hex(char c)
	28	{
	29	if (c >= '0' && c <= '9')
	30	return c - '0';
	31	if (c >= 'a' && c <= 'f')
	32	return c - 'a' + 10;
	33	return c - 'A' + 10;
	34	}
	35
	36	static void read_objdump_line(const char line, size_t line_len, void *buf,
	37	size_t *len)
	38	{
	39	const char *p;
	40	size_t i;
	41
	42	/* Skip to a colon */
	43	p = strchr(line, ':');
	44	if (!p)
	45	return;
	46	i = p + 1 - line;
	47
	48	/* Read bytes */
	49	while (*len) {
	50	char c1, c2;
	51
	52	/* Skip spaces */
	53	for (; i < line_len; i++) {
	54	if (!isspace(line[i]))
	55	break;
	56	}
	57	/* Get 2 hex digits */
	58	if (i >= line_len \|\| !isxdigit(line[i]))
	59	break;
	60	c1 = line[i++];
	61	if (i >= line_len \|\| !isxdigit(line[i]))
	62	break;
	63	c2 = line[i++];
	64	/* Followed by a space */
	65	if (i < line_len && line[i] && !isspace(line[i]))
	66	break;
	67	/* Store byte */
	68	(unsigned char )*buf = (hex(c1) << 4) \| hex(c2);
	69	*buf += 1;
	70	*len -= 1;
	71	}
	72	}
	73
	74	static int read_objdump_output(FILE f, void buf, size_t len)
	75	{
	76	char *line = NULL;
	77	size_t line_len;
	78	ssize_t ret;
	79	int err = 0;
	80
	81	while (1) {
	82	ret = getline(&line, &line_len, f);
	83	if (feof(f))
	84	break;
	85	if (ret < 0) {
	86	pr_debug("getline failed\n");
	87	err = -1;
	88	break;
	89	}
	90	read_objdump_line(line, ret, buf, len);
91	}
92
93	free(line);
94
95	return err;
96	}
97
98	static int read_via_objdump(const char filename, u64 addr, void buf,
99	size_t len)
100	{
101	char cmd[PATH_MAX * 2];
102	const char *fmt;
103	FILE *f;
104	int ret;
105
106	fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
107	ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
108	filename);
109	if (ret <= 0 \|\| (size_t)ret >= sizeof(cmd))
110	return -1;
111
112	pr_debug("Objdump command is: %s\n", cmd);
113
7a77bc2c AH	114	/* Ignore objdump errors */
	115	strcat(cmd, " 2>/dev/null");
	116
b55ae0a9 AH	117	f = popen(cmd, "r");
	118	if (!f) {
	119	pr_debug("popen failed\n");
	120	return -1;
	121	}
	122
	123	ret = read_objdump_output(f, &buf, &len);
	124	if (len) {
	125	pr_debug("objdump read too few bytes\n");
	126	if (!ret)
	127	ret = len;
	128	}
	129
	130	pclose(f);
	131
	132	return ret;
	133	}
	134
	135	static int read_object_code(u64 addr, size_t len, u8 cpumode,
7a77bc2c AH	136	struct thread thread, struct machine machine,
7a77bc2c AH	137	struct state *state)
b55ae0a9 AH	138	{
	139	struct addr_location al;
	140	unsigned char buf1[BUFSZ];
	141	unsigned char buf2[BUFSZ];
	142	size_t ret_len;
	143	u64 objdump_addr;
	144	int ret;
	145
	146	pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
	147
	148	thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION, addr,
326f59bf	149	&al);
b55ae0a9 AH	150	if (!al.map \|\| !al.map->dso) {
	151	pr_debug("thread__find_addr_map failed\n");
	152	return -1;
	153	}
	154
	155	pr_debug("File is: %s\n", al.map->dso->long_name);
	156
7a77bc2c AH	157	if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
7a77bc2c AH	158	!dso__is_kcore(al.map->dso)) {
b55ae0a9 AH	159	pr_debug("Unexpected kernel address - skipping\n");
	160	return 0;
	161	}
	162
	163	pr_debug("On file address is: %#"PRIx64"\n", al.addr);
	164
	165	if (len > BUFSZ)
	166	len = BUFSZ;
	167
	168	/* Do not go off the map */
	169	if (addr + len > al.map->end)
	170	len = al.map->end - addr;
	171
	172	/* Read the object code using perf */
	173	ret_len = dso__data_read_offset(al.map->dso, machine, al.addr, buf1,
	174	len);
	175	if (ret_len != len) {
	176	pr_debug("dso__data_read_offset failed\n");
	177	return -1;
	178	}
	179
	180	/*
	181	* Converting addresses for use by objdump requires more information.
	182	* map__load() does that. See map__rip_2objdump() for details.
	183	*/
	184	if (map__load(al.map, NULL))
	185	return -1;
	186
7a77bc2c AH	187	/* objdump struggles with kcore - try each map only once */
	188	if (dso__is_kcore(al.map->dso)) {
	189	size_t d;
	190
	191	for (d = 0; d < state->done_cnt; d++) {
	192	if (state->done[d] == al.map->start) {
	193	pr_debug("kcore map tested already");
	194	pr_debug(" - skipping\n");
	195	return 0;
	196	}
	197	}
	198	if (state->done_cnt >= ARRAY_SIZE(state->done)) {
	199	pr_debug("Too many kcore maps - skipping\n");
	200	return 0;
	201	}
	202	state->done[state->done_cnt++] = al.map->start;
	203	}
	204
b55ae0a9 AH	205	/* Read the object code using objdump */
	206	objdump_addr = map__rip_2objdump(al.map, al.addr);
	207	ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
	208	if (ret > 0) {
	209	/*
	210	* The kernel maps are inaccurate - assume objdump is right in
	211	* that case.
	212	*/
	213	if (cpumode == PERF_RECORD_MISC_KERNEL \|\|
	214	cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
	215	len -= ret;
7a77bc2c	216	if (len) {
b55ae0a9	217	pr_debug("Reducing len to %zu\n", len);
7a77bc2c AH	218	} else if (dso__is_kcore(al.map->dso)) {
	219	/*
	220	* objdump cannot handle very large segments
	221	* that may be found in kcore.
	222	*/
	223	pr_debug("objdump failed for kcore");
	224	pr_debug(" - skipping\n");
	225	return 0;
	226	} else {
b55ae0a9	227	return -1;
7a77bc2c	228	}
b55ae0a9 AH	229	}
	230	}
	231	if (ret < 0) {
	232	pr_debug("read_via_objdump failed\n");
	233	return -1;
	234	}
	235
	236	/* The results should be identical */
	237	if (memcmp(buf1, buf2, len)) {
	238	pr_debug("Bytes read differ from those read by objdump\n");
	239	return -1;
	240	}
	241	pr_debug("Bytes read match those read by objdump\n");
	242
	243	return 0;
	244	}
	245
	246	static int process_sample_event(struct machine *machine,
	247	struct perf_evlist *evlist,
7a77bc2c	248	union perf_event event, struct state state)
b55ae0a9 AH	249	{
	250	struct perf_sample sample;
	251	struct thread *thread;
	252	u8 cpumode;
	253
	254	if (perf_evlist__parse_sample(evlist, event, &sample)) {
	255	pr_debug("perf_evlist__parse_sample failed\n");
	256	return -1;
	257	}
	258
314add6b	259	thread = machine__findnew_thread(machine, sample.pid, sample.pid);
b55ae0a9 AH	260	if (!thread) {
	261	pr_debug("machine__findnew_thread failed\n");
	262	return -1;
	263	}
	264
	265	cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
	266
7a77bc2c AH	267	return read_object_code(sample.ip, READLEN, cpumode, thread, machine,
7a77bc2c AH	268	state);
b55ae0a9 AH	269	}
	270
	271	static int process_event(struct machine machine, struct perf_evlist evlist,
7a77bc2c	272	union perf_event event, struct state state)
b55ae0a9 AH	273	{
b55ae0a9 AH	274	if (event->header.type == PERF_RECORD_SAMPLE)
7a77bc2c	275	return process_sample_event(machine, evlist, event, state);
b55ae0a9	276
48095b72 AH	277	if (event->header.type == PERF_RECORD_THROTTLE \|\|
	278	event->header.type == PERF_RECORD_UNTHROTTLE)
	279	return 0;
	280
	281	if (event->header.type < PERF_RECORD_MAX) {
	282	int ret;
	283
	284	ret = machine__process_event(machine, event, NULL);
	285	if (ret < 0)
	286	pr_debug("machine__process_event failed, event type %u\n",
	287	event->header.type);
	288	return ret;
	289	}
b55ae0a9 AH	290
	291	return 0;
	292	}
	293
7a77bc2c AH	294	static int process_events(struct machine machine, struct perf_evlist evlist,
7a77bc2c AH	295	struct state *state)
b55ae0a9 AH	296	{
	297	union perf_event *event;
	298	int i, ret;
	299
	300	for (i = 0; i < evlist->nr_mmaps; i++) {
	301	while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
7a77bc2c	302	ret = process_event(machine, evlist, event, state);
8e50d384	303	perf_evlist__mmap_consume(evlist, i);
b55ae0a9 AH	304	if (ret < 0)
	305	return ret;
	306	}
	307	}
	308	return 0;
	309	}
	310
	311	static int comp(const void a, const void b)
	312	{
	313	return (int )a - (int )b;
	314	}
	315
	316	static void do_sort_something(void)
	317	{
309b5185	318	int buf[40960], i;
b55ae0a9	319
309b5185 DA	320	for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
309b5185 DA	321	buf[i] = ARRAY_SIZE(buf) - i - 1;
b55ae0a9	322
309b5185	323	qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
b55ae0a9	324
309b5185	325	for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
b55ae0a9 AH	326	if (buf[i] != i) {
	327	pr_debug("qsort failed\n");
	328	break;
	329	}
	330	}
	331	}
	332
	333	static void sort_something(void)
	334	{
	335	int i;
	336
	337	for (i = 0; i < 10; i++)
	338	do_sort_something();
	339	}
	340
	341	static void syscall_something(void)
	342	{
	343	int pipefd[2];
	344	int i;
	345
	346	for (i = 0; i < 1000; i++) {
	347	if (pipe(pipefd) < 0) {
	348	pr_debug("pipe failed\n");
	349	break;
	350	}
	351	close(pipefd[1]);
	352	close(pipefd[0]);
	353	}
	354	}
	355
	356	static void fs_something(void)
	357	{
	358	const char *test_file_name = "temp-perf-code-reading-test-file--";
	359	FILE *f;
	360	int i;
	361
	362	for (i = 0; i < 1000; i++) {
	363	f = fopen(test_file_name, "w+");
	364	if (f) {
	365	fclose(f);
	366	unlink(test_file_name);
	367	}
	368	}
	369	}
	370
	371	static void do_something(void)
	372	{
	373	fs_something();
	374
	375	sort_something();
	376
	377	syscall_something();
	378	}
	379
	380	enum {
	381	TEST_CODE_READING_OK,
	382	TEST_CODE_READING_NO_VMLINUX,
7a77bc2c	383	TEST_CODE_READING_NO_KCORE,
b55ae0a9	384	TEST_CODE_READING_NO_ACCESS,
7a77bc2c	385	TEST_CODE_READING_NO_KERNEL_OBJ,
b55ae0a9 AH	386	};
b55ae0a9 AH	387
7a77bc2c	388	static int do_test_code_reading(bool try_kcore)
b55ae0a9 AH	389	{
	390	struct machines machines;
	391	struct machine *machine;
	392	struct thread *thread;
b4006796	393	struct record_opts opts = {
b55ae0a9 AH	394	.mmap_pages = UINT_MAX,
	395	.user_freq = UINT_MAX,
	396	.user_interval = ULLONG_MAX,
	397	.freq = 4000,
	398	.target = {
	399	.uses_mmap = true,
	400	},
	401	};
7a77bc2c AH	402	struct state state = {
	403	.done_cnt = 0,
	404	};
b55ae0a9 AH	405	struct thread_map *threads = NULL;
	406	struct cpu_map *cpus = NULL;
	407	struct perf_evlist *evlist = NULL;
	408	struct perf_evsel *evsel = NULL;
	409	int err = -1, ret;
	410	pid_t pid;
	411	struct map *map;
7a77bc2c	412	bool have_vmlinux, have_kcore, excl_kernel = false;
b55ae0a9 AH	413
	414	pid = getpid();
	415
	416	machines__init(&machines);
	417	machine = &machines.host;
	418
	419	ret = machine__create_kernel_maps(machine);
	420	if (ret < 0) {
	421	pr_debug("machine__create_kernel_maps failed\n");
	422	goto out_err;
	423	}
	424
7a77bc2c AH	425	/* Force the use of kallsyms instead of vmlinux to try kcore */
	426	if (try_kcore)
	427	symbol_conf.kallsyms_name = "/proc/kallsyms";
	428
b55ae0a9 AH	429	/* Load kernel map */
	430	map = machine->vmlinux_maps[MAP__FUNCTION];
	431	ret = map__load(map, NULL);
	432	if (ret < 0) {
	433	pr_debug("map__load failed\n");
	434	goto out_err;
	435	}
7a77bc2c AH	436	have_vmlinux = dso__is_vmlinux(map->dso);
	437	have_kcore = dso__is_kcore(map->dso);
	438
	439	/* 2nd time through we just try kcore */
	440	if (try_kcore && !have_kcore)
	441	return TEST_CODE_READING_NO_KCORE;
	442
	443	/* No point getting kernel events if there is no kernel object */
	444	if (!have_vmlinux && !have_kcore)
b55ae0a9 AH	445	excl_kernel = true;
	446
	447	threads = thread_map__new_by_tid(pid);
	448	if (!threads) {
	449	pr_debug("thread_map__new_by_tid failed\n");
	450	goto out_err;
	451	}
	452
	453	ret = perf_event__synthesize_thread_map(NULL, threads,
62605dc5	454	perf_event__process, machine, false);
b55ae0a9 AH	455	if (ret < 0) {
	456	pr_debug("perf_event__synthesize_thread_map failed\n");
	457	goto out_err;
	458	}
	459
314add6b	460	thread = machine__findnew_thread(machine, pid, pid);
b55ae0a9 AH	461	if (!thread) {
	462	pr_debug("machine__findnew_thread failed\n");
	463	goto out_err;
	464	}
	465
	466	cpus = cpu_map__new(NULL);
	467	if (!cpus) {
	468	pr_debug("cpu_map__new failed\n");
	469	goto out_err;
	470	}
	471
	472	while (1) {
	473	const char *str;
	474
	475	evlist = perf_evlist__new();
	476	if (!evlist) {
	477	pr_debug("perf_evlist__new failed\n");
	478	goto out_err;
	479	}
	480
	481	perf_evlist__set_maps(evlist, cpus, threads);
	482
	483	if (excl_kernel)
	484	str = "cycles:u";
	485	else
	486	str = "cycles";
	487	pr_debug("Parsing event '%s'\n", str);
	488	ret = parse_events(evlist, str);
	489	if (ret < 0) {
	490	pr_debug("parse_events failed\n");
	491	goto out_err;
	492	}
	493
	494	perf_evlist__config(evlist, &opts);
	495
	496	evsel = perf_evlist__first(evlist);
	497
	498	evsel->attr.comm = 1;
	499	evsel->attr.disabled = 1;
	500	evsel->attr.enable_on_exec = 0;
	501
	502	ret = perf_evlist__open(evlist);
	503	if (ret < 0) {
	504	if (!excl_kernel) {
	505	excl_kernel = true;
ae450a7d	506	perf_evlist__set_maps(evlist, NULL, NULL);
b55ae0a9 AH	507	perf_evlist__delete(evlist);
	508	evlist = NULL;
	509	continue;
	510	}
	511	pr_debug("perf_evlist__open failed\n");
	512	goto out_err;
	513	}
	514	break;
	515	}
	516
	517	ret = perf_evlist__mmap(evlist, UINT_MAX, false);
	518	if (ret < 0) {
	519	pr_debug("perf_evlist__mmap failed\n");
	520	goto out_err;
	521	}
	522
	523	perf_evlist__enable(evlist);
	524
	525	do_something();
	526
	527	perf_evlist__disable(evlist);
	528
7a77bc2c	529	ret = process_events(machine, evlist, &state);
b55ae0a9 AH	530	if (ret < 0)
	531	goto out_err;
	532
7a77bc2c AH	533	if (!have_vmlinux && !have_kcore && !try_kcore)
	534	err = TEST_CODE_READING_NO_KERNEL_OBJ;
	535	else if (!have_vmlinux && !try_kcore)
b55ae0a9 AH	536	err = TEST_CODE_READING_NO_VMLINUX;
	537	else if (excl_kernel)
	538	err = TEST_CODE_READING_NO_ACCESS;
	539	else
	540	err = TEST_CODE_READING_OK;
	541	out_err:
	542	if (evlist) {
b55ae0a9	543	perf_evlist__delete(evlist);
03ad9747	544	} else {
b55ae0a9	545	cpu_map__delete(cpus);
b55ae0a9	546	thread_map__delete(threads);
03ad9747	547	}
b55ae0a9 AH	548	machines__destroy_kernel_maps(&machines);
	549	machine__delete_threads(machine);
	550	machines__exit(&machines);
	551
	552	return err;
	553	}
	554
	555	int test__code_reading(void)
	556	{
	557	int ret;
	558
7a77bc2c AH	559	ret = do_test_code_reading(false);
	560	if (!ret)
	561	ret = do_test_code_reading(true);
b55ae0a9 AH	562
	563	switch (ret) {
	564	case TEST_CODE_READING_OK:
	565	return 0;
	566	case TEST_CODE_READING_NO_VMLINUX:
	567	fprintf(stderr, " (no vmlinux)");
	568	return 0;
7a77bc2c AH	569	case TEST_CODE_READING_NO_KCORE:
	570	fprintf(stderr, " (no kcore)");
	571	return 0;
b55ae0a9 AH	572	case TEST_CODE_READING_NO_ACCESS:
	573	fprintf(stderr, " (no access)");
	574	return 0;
7a77bc2c AH	575	case TEST_CODE_READING_NO_KERNEL_OBJ:
	576	fprintf(stderr, " (no kernel obj)");
	577	return 0;
b55ae0a9 AH	578	default:
	579	return -1;
	580	};
	581	}