Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/zalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <inttypes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "tests.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "debug.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "machine.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "event.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "../util/unwind.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include "perf_regs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "map.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "symbol.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "thread.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "callchain.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "util/synthetic-events.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #if defined (__x86_64__) || defined (__i386__) || defined (__powerpc__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "arch-tests.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) /* For bsearch. We try to unwind functions in shared object. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static int mmap_handler(struct perf_tool *tool __maybe_unused,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 			union perf_event *event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 			struct perf_sample *sample,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 			struct machine *machine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	return machine__process_mmap2_event(machine, event, sample);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int init_live_machine(struct machine *machine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	union perf_event event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	pid_t pid = getpid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	memset(&event, 0, sizeof(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 						  mmap_handler, machine, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * We need to keep these functions global, despite the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * fact that they are used only locally in this object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * in order to keep them around even if the binary is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * stripped. If they are gone, the unwind check for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * symbol fails.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) int test_dwarf_unwind__thread(struct thread *thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) int test_dwarf_unwind__compare(void *p1, void *p2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) int test_dwarf_unwind__krava_3(struct thread *thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) int test_dwarf_unwind__krava_2(struct thread *thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) int test_dwarf_unwind__krava_1(struct thread *thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) #define MAX_STACK 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static int unwind_entry(struct unwind_entry *entry, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	unsigned long *cnt = (unsigned long *) arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	char *symbol = entry->ms.sym ? entry->ms.sym->name : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	static const char *funcs[MAX_STACK] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		"test__arch_unwind_sample",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		"test_dwarf_unwind__thread",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		"test_dwarf_unwind__compare",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		"bsearch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		"test_dwarf_unwind__krava_3",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		"test_dwarf_unwind__krava_2",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		"test_dwarf_unwind__krava_1",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		"test__dwarf_unwind"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	 * The funcs[MAX_STACK] array index, based on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	 * callchain order setup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	int idx = callchain_param.order == ORDER_CALLER ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		  MAX_STACK - *cnt - 1 : *cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (*cnt >= MAX_STACK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (!symbol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			 entry->ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	(*cnt)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	pr_debug("got: %s 0x%" PRIx64 ", expecting %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		 symbol, entry->ip, funcs[idx]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return strcmp((const char *) symbol, funcs[idx]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) noinline int test_dwarf_unwind__thread(struct thread *thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct perf_sample sample;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	unsigned long cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	memset(&sample, 0, sizeof(sample));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (test__arch_unwind_sample(&sample, thread)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		pr_debug("failed to get unwind sample\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	err = unwind__get_entries(unwind_entry, &cnt, thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				  &sample, MAX_STACK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		pr_debug("unwind failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	else if (cnt != MAX_STACK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		pr_debug("got wrong number of stack entries %lu != %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			 cnt, MAX_STACK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	zfree(&sample.user_stack.data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	zfree(&sample.user_regs.regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static int global_unwind_retval = -INT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) noinline int test_dwarf_unwind__compare(void *p1, void *p2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	/* Any possible value should be 'thread' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	struct thread *thread = *(struct thread **)p1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (global_unwind_retval == -INT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		/* Call unwinder twice for both callchain orders. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		callchain_param.order = ORDER_CALLER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		global_unwind_retval = test_dwarf_unwind__thread(thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		if (!global_unwind_retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			callchain_param.order = ORDER_CALLEE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			global_unwind_retval = test_dwarf_unwind__thread(thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	return p1 - p2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) noinline int test_dwarf_unwind__krava_3(struct thread *thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct thread *array[2] = {thread, thread};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	void *fp = &bsearch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	 * make _bsearch a volatile function pointer to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	 * prevent potential optimization, which may expand
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	 * bsearch and call compare directly from this function,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	 * instead of libc shared object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	void *(*volatile _bsearch)(void *, void *, size_t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			size_t, int (*)(void *, void *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	_bsearch = fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	_bsearch(array, &thread, 2, sizeof(struct thread **),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		 test_dwarf_unwind__compare);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return global_unwind_retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) noinline int test_dwarf_unwind__krava_2(struct thread *thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return test_dwarf_unwind__krava_3(thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) noinline int test_dwarf_unwind__krava_1(struct thread *thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	return test_dwarf_unwind__krava_2(thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) int test__dwarf_unwind(struct test *test __maybe_unused, int subtest __maybe_unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	struct machine *machine;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	struct thread *thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	machine = machine__new_host();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (!machine) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		pr_err("Could not get machine\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (machine__create_kernel_maps(machine)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		pr_err("Failed to create kernel maps\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	callchain_param.record_mode = CALLCHAIN_DWARF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	dwarf_callchain_users = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (init_live_machine(machine)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		pr_err("Could not init machine\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	if (verbose > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		machine__fprintf(machine, stderr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	thread = machine__find_thread(machine, getpid(), getpid());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (!thread) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		pr_err("Could not get thread\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	err = test_dwarf_unwind__krava_1(thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	thread__put(thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	machine__delete_threads(machine);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	machine__delete(machine);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }