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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Inspired by breakpoint overflow test done by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Vince Weaver <vincent.weaver@maine.edu> for perf_event_tests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * (git://github.com/deater/perf_event_tests)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #define __SANE_USERSPACE_TYPES__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <sys/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/hw_breakpoint.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "tests.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include "debug.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include "event.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include "perf-sys.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "cloexec.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static int fd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static int fd2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int fd3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int overflows;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static int overflows_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) volatile long the_var;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * Use ASM to ensure watchpoint and breakpoint can be triggered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * at one instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #if defined (__x86_64__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) extern void __test_function(volatile long *ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) asm (
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	".pushsection .text;"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	".globl __test_function\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	".type __test_function, @function;"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	"__test_function:\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	"incq (%rdi)\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	"ret\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	".popsection\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static void __test_function(volatile long *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	*ptr = 0x1234;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static noinline int test_function(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	__test_function(&the_var);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	the_var++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return time(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static void sig_handler_2(int signum __maybe_unused,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			  siginfo_t *oh __maybe_unused,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			  void *uc __maybe_unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	overflows_2++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (overflows_2 > 10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static void sig_handler(int signum __maybe_unused,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			siginfo_t *oh __maybe_unused,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			void *uc __maybe_unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	overflows++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (overflows > 10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		 * This should be executed only once during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		 * this test, if we are here for the 10th
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		 * time, consider this the recursive issue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		 * We can get out of here by disable events,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		 * so no new SIGIO is delivered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int __event(bool is_x, void *addr, int sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct perf_event_attr pe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	memset(&pe, 0, sizeof(struct perf_event_attr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	pe.type = PERF_TYPE_BREAKPOINT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	pe.size = sizeof(struct perf_event_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	pe.config = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	pe.bp_type = is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	pe.bp_addr = (unsigned long) addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	pe.bp_len = sizeof(long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	pe.sample_period = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	pe.sample_type = PERF_SAMPLE_IP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	pe.wakeup_events = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	pe.disabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	pe.exclude_kernel = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	pe.exclude_hv = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	fd = sys_perf_event_open(&pe, 0, -1, -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 				 perf_event_open_cloexec_flag());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		pr_debug("failed opening event %llx\n", pe.config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		return TEST_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	fcntl(fd, F_SETSIG, sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	fcntl(fd, F_SETOWN, getpid());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	ioctl(fd, PERF_EVENT_IOC_RESET, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static int bp_event(void *addr, int sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	return __event(true, addr, sig);
^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) static int wp_event(void *addr, int sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return __event(false, addr, sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static long long bp_count(int fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	long long count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	ret = read(fd, &count, sizeof(long long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	if (ret != sizeof(long long)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		pr_debug("failed to read: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return TEST_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int test__bp_signal(struct test *test __maybe_unused, int subtest __maybe_unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct sigaction sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	long long count1, count2, count3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	/* setup SIGIO signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	memset(&sa, 0, sizeof(struct sigaction));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	sa.sa_sigaction = (void *) sig_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	sa.sa_flags = SA_SIGINFO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (sigaction(SIGIO, &sa, NULL) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		pr_debug("failed setting up signal handler\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		return TEST_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	sa.sa_sigaction = (void *) sig_handler_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if (sigaction(SIGUSR1, &sa, NULL) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		pr_debug("failed setting up signal handler 2\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return TEST_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	 * We create following events:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	 * fd1 - breakpoint event on __test_function with SIGIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	 *       signal configured. We should get signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	 *       notification each time the breakpoint is hit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	 * fd2 - breakpoint event on sig_handler with SIGUSR1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	 *       configured. We should get SIGUSR1 each time when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	 *       breakpoint is hit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	 * fd3 - watchpoint event on __test_function with SIGIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	 *       configured.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * Following processing should happen:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 *   Exec:               Action:                       Result:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 *   incq (%rdi)       - fd1 event breakpoint hit   -> count1 == 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	 *                     - SIGIO is delivered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 *   sig_handler       - fd2 event breakpoint hit   -> count2 == 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 *                     - SIGUSR1 is delivered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 *   sig_handler_2                                  -> overflows_2 == 1  (nested signal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 *   sys_rt_sigreturn  - return from sig_handler_2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 *   overflows++                                    -> overflows = 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	 *   sys_rt_sigreturn  - return from sig_handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	 *   incq (%rdi)       - fd3 event watchpoint hit   -> count3 == 1       (wp and bp in one insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	 *                     - SIGIO is delivered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 *   sig_handler       - fd2 event breakpoint hit   -> count2 == 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 *                     - SIGUSR1 is delivered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	 *   sig_handler_2                                  -> overflows_2 == 2  (nested signal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	 *   sys_rt_sigreturn  - return from sig_handler_2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	 *   overflows++                                    -> overflows = 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 *   sys_rt_sigreturn  - return from sig_handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 *   the_var++         - fd3 event watchpoint hit   -> count3 == 2       (standalone watchpoint)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 *                     - SIGIO is delivered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	 *   sig_handler       - fd2 event breakpoint hit   -> count2 == 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	 *                     - SIGUSR1 is delivered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	 *   sig_handler_2                                  -> overflows_2 == 3  (nested signal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	 *   sys_rt_sigreturn  - return from sig_handler_2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	 *   overflows++                                    -> overflows == 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 *   sys_rt_sigreturn  - return from sig_handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 * The test case check following error conditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 * - we get stuck in signal handler because of debug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 *   exception being triggered receursively due to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 *   the wrong RF EFLAG management
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	 * - we never trigger the sig_handler breakpoint due
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	 *   to the rong RF EFLAG management
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	fd1 = bp_event(__test_function, SIGIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	fd2 = bp_event(sig_handler, SIGUSR1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	fd3 = wp_event((void *)&the_var, SIGIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	ioctl(fd1, PERF_EVENT_IOC_ENABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	ioctl(fd2, PERF_EVENT_IOC_ENABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	ioctl(fd3, PERF_EVENT_IOC_ENABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	 * Kick off the test by trigering 'fd1'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	 * breakpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	test_function();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	count1 = bp_count(fd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	count2 = bp_count(fd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	count3 = bp_count(fd3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	close(fd1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	close(fd2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	close(fd3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	pr_debug("count1 %lld, count2 %lld, count3 %lld, overflow %d, overflows_2 %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		 count1, count2, count3, overflows, overflows_2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (count1 != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		if (count1 == 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			pr_debug("failed: RF EFLAG recursion issue detected\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			pr_debug("failed: wrong count for bp1: %lld, expected 1\n", count1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	if (overflows != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		pr_debug("failed: wrong overflow (%d) hit, expected 3\n", overflows);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (overflows_2 != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		pr_debug("failed: wrong overflow_2 (%d) hit, expected 3\n", overflows_2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (count2 != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		pr_debug("failed: wrong count for bp2 (%lld), expected 3\n", count2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	if (count3 != 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		pr_debug("failed: wrong count for bp3 (%lld), expected 2\n", count3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return count1 == 1 && overflows == 3 && count2 == 3 && overflows_2 == 3 && count3 == 2 ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		TEST_OK : TEST_FAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) bool test__bp_signal_is_supported(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	 * PowerPC and S390 do not support creation of instruction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	 * breakpoints using the perf_event interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	 * ARM requires explicit rounding down of the instruction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	 * pointer in Thumb mode, and then requires the single-step
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	 * to be handled explicitly in the overflow handler to avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	 * stepping into the SIGIO handler and getting stuck on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	 * breakpointed instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	 * Since arm64 has the same issue with arm for the single-step
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	 * handling, this case also gets stuck on the breakpointed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	 * instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	 * Just disable the test for these architectures until these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	 * issues are resolved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) #if defined(__powerpc__) || defined(__s390x__) || defined(__arm__) || \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)     defined(__aarch64__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }