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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-23 13:32:18 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-23 13:32:18 +0100 |
| commit | c05f3642f4304dd081876e77a68555b6aba4483f (patch) | |
| tree | 915baf10c3518d162c00e62b5d855cf92282ed79 /tools/perf/tests/wp.c | |
| parent | 0200fbdd431519d730b5d399a12840ec832b27cc (diff) | |
| parent | dda93b45389f025fd3422d22cc31cc1ea6040305 (diff) | |
| download | linux-c05f3642f4304dd081876e77a68555b6aba4483f.tar.gz linux-c05f3642f4304dd081876e77a68555b6aba4483f.tar.bz2 linux-c05f3642f4304dd081876e77a68555b6aba4483f.zip | |
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf updates from Ingo Molnar:
"The main updates in this cycle were:
- Lots of perf tooling changes too voluminous to list (big perf trace
and perf stat improvements, lots of libtraceevent reorganization,
etc.), so I'll list the authors and refer to the changelog for
details:
Benjamin Peterson, Jérémie Galarneau, Kim Phillips, Peter
Zijlstra, Ravi Bangoria, Sangwon Hong, Sean V Kelley, Steven
Rostedt, Thomas Gleixner, Ding Xiang, Eduardo Habkost, Thomas
Richter, Andi Kleen, Sanskriti Sharma, Adrian Hunter, Tzvetomir
Stoyanov, Arnaldo Carvalho de Melo, Jiri Olsa.
... with the bulk of the changes written by Jiri Olsa, Tzvetomir
Stoyanov and Arnaldo Carvalho de Melo.
- Continued intel_rdt work with a focus on playing well with perf
events. This also imported some non-perf RDT work due to
dependencies. (Reinette Chatre)
- Implement counter freezing for Arch Perfmon v4 (Skylake and newer).
This allows to speed up the PMI handler by avoiding unnecessary MSR
writes and make it more accurate. (Andi Kleen)
- kprobes cleanups and simplification (Masami Hiramatsu)
- Intel Goldmont PMU updates (Kan Liang)
- ... plus misc other fixes and updates"
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (155 commits)
kprobes/x86: Use preempt_enable() in optimized_callback()
x86/intel_rdt: Prevent pseudo-locking from using stale pointers
kprobes, x86/ptrace.h: Make regs_get_kernel_stack_nth() not fault on bad stack
perf/x86/intel: Export mem events only if there's PEBS support
x86/cpu: Drop pointless static qualifier in punit_dev_state_show()
x86/intel_rdt: Fix initial allocation to consider CDP
x86/intel_rdt: CBM overlap should also check for overlap with CDP peer
x86/intel_rdt: Introduce utility to obtain CDP peer
tools lib traceevent, perf tools: Move struct tep_handler definition in a local header file
tools lib traceevent: Separate out tep_strerror() for strerror_r() issues
perf python: More portable way to make CFLAGS work with clang
perf python: Make clang_has_option() work on Python 3
perf tools: Free temporary 'sys' string in read_event_files()
perf tools: Avoid double free in read_event_file()
perf tools: Free 'printk' string in parse_ftrace_printk()
perf tools: Cleanup trace-event-info 'tdata' leak
perf strbuf: Match va_{add,copy} with va_end
perf test: S390 does not support watchpoints in test 22
perf auxtrace: Include missing asm/bitsperlong.h to get BITS_PER_LONG
tools include: Adopt linux/bits.h
...
Diffstat (limited to 'tools/perf/tests/wp.c')
| -rw-r--r-- | tools/perf/tests/wp.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c new file mode 100644 index 000000000000..f89e6806557b --- /dev/null +++ b/tools/perf/tests/wp.c @@ -0,0 +1,241 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <stdlib.h> +#include <sys/ioctl.h> +#include <linux/hw_breakpoint.h> +#include "tests.h" +#include "debug.h" +#include "cloexec.h" + +#define WP_TEST_ASSERT_VAL(fd, text, val) \ +do { \ + long long count; \ + wp_read(fd, &count, sizeof(long long)); \ + TEST_ASSERT_VAL(text, count == val); \ +} while (0) + +volatile u64 data1; +volatile u8 data2[3]; + +static int wp_read(int fd, long long *count, int size) +{ + int ret = read(fd, count, size); + + if (ret != size) { + pr_debug("failed to read: %d\n", ret); + return -1; + } + return 0; +} + +static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type, + void *wp_addr, unsigned long wp_len) +{ + memset(attr, 0, sizeof(struct perf_event_attr)); + attr->type = PERF_TYPE_BREAKPOINT; + attr->size = sizeof(struct perf_event_attr); + attr->config = 0; + attr->bp_type = wp_type; + attr->bp_addr = (unsigned long)wp_addr; + attr->bp_len = wp_len; + attr->sample_period = 1; + attr->sample_type = PERF_SAMPLE_IP; + attr->exclude_kernel = 1; + attr->exclude_hv = 1; +} + +static int __event(int wp_type, void *wp_addr, unsigned long wp_len) +{ + int fd; + struct perf_event_attr attr; + + get__perf_event_attr(&attr, wp_type, wp_addr, wp_len); + fd = sys_perf_event_open(&attr, 0, -1, -1, + perf_event_open_cloexec_flag()); + if (fd < 0) + pr_debug("failed opening event %x\n", attr.bp_type); + + return fd; +} + +static int wp_ro_test(void) +{ + int fd; + unsigned long tmp, tmp1 = rand(); + + fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1)); + if (fd < 0) + return -1; + + tmp = data1; + WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1); + + data1 = tmp1 + tmp; + WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1); + + close(fd); + return 0; +} + +static int wp_wo_test(void) +{ + int fd; + unsigned long tmp, tmp1 = rand(); + + fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); + if (fd < 0) + return -1; + + tmp = data1; + WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0); + + data1 = tmp1 + tmp; + WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1); + + close(fd); + return 0; +} + +static int wp_rw_test(void) +{ + int fd; + unsigned long tmp, tmp1 = rand(); + + fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1, + sizeof(data1)); + if (fd < 0) + return -1; + + tmp = data1; + WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1); + + data1 = tmp1 + tmp; + WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2); + + close(fd); + return 0; +} + +static int wp_modify_test(void) +{ + int fd, ret; + unsigned long tmp = rand(); + struct perf_event_attr new_attr; + + fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1)); + if (fd < 0) + return -1; + + data1 = tmp; + WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1); + + /* Modify watchpoint with disabled = 1 */ + get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0], + sizeof(u8) * 2); + new_attr.disabled = 1; + ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr); + if (ret < 0) { + pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n"); + close(fd); + return ret; + } + + data2[1] = tmp; /* Not Counted */ + WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1); + + /* Enable the event */ + ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); + if (ret < 0) { + pr_debug("Failed to enable event\n"); + close(fd); + return ret; + } + + data2[1] = tmp; /* Counted */ + WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2); + + data2[2] = tmp; /* Not Counted */ + WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2); + + close(fd); + return 0; +} + +static bool wp_ro_supported(void) +{ +#if defined (__x86_64__) || defined (__i386__) + return false; +#else + return true; +#endif +} + +static void wp_ro_skip_msg(void) +{ +#if defined (__x86_64__) || defined (__i386__) + pr_debug("Hardware does not support read only watchpoints.\n"); +#endif +} + +static struct { + const char *desc; + int (*target_func)(void); + bool (*is_supported)(void); + void (*skip_msg)(void); +} wp_testcase_table[] = { + { + .desc = "Read Only Watchpoint", + .target_func = &wp_ro_test, + .is_supported = &wp_ro_supported, + .skip_msg = &wp_ro_skip_msg, + }, + { + .desc = "Write Only Watchpoint", + .target_func = &wp_wo_test, + }, + { + .desc = "Read / Write Watchpoint", + .target_func = &wp_rw_test, + }, + { + .desc = "Modify Watchpoint", + .target_func = &wp_modify_test, + }, +}; + +int test__wp_subtest_get_nr(void) +{ + return (int)ARRAY_SIZE(wp_testcase_table); +} + +const char *test__wp_subtest_get_desc(int i) +{ + if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) + return NULL; + return wp_testcase_table[i].desc; +} + +int test__wp(struct test *test __maybe_unused, int i) +{ + if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table)) + return TEST_FAIL; + + if (wp_testcase_table[i].is_supported && + !wp_testcase_table[i].is_supported()) { + wp_testcase_table[i].skip_msg(); + return TEST_SKIP; + } + + return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL; +} + +/* The s390 so far does not have support for + * instruction breakpoint using the perf_event_open() system call. + */ +bool test__wp_is_supported(void) +{ +#if defined(__s390x__) + return false; +#else + return true; +#endif +} |