aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/examples
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/examples')
-rw-r--r--tools/perf/examples/bpf/5sec.c53
-rw-r--r--tools/perf/examples/bpf/augmented_raw_syscalls.c417
-rw-r--r--tools/perf/examples/bpf/empty.c12
-rw-r--r--tools/perf/examples/bpf/hello.c27
-rw-r--r--tools/perf/examples/bpf/sys_enter_openat.c33
5 files changed, 0 insertions, 542 deletions
diff --git a/tools/perf/examples/bpf/5sec.c b/tools/perf/examples/bpf/5sec.c
deleted file mode 100644
index 3bd7fc17631f..000000000000
--- a/tools/perf/examples/bpf/5sec.c
+++ /dev/null
@@ -1,53 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- Description:
-
- . Disable strace like syscall tracing (--no-syscalls), or try tracing
- just some (-e *sleep).
-
- . Attach a filter function to a kernel function, returning when it should
- be considered, i.e. appear on the output.
-
- . Run it system wide, so that any sleep of >= 5 seconds and < than 6
- seconds gets caught.
-
- . Ask for callgraphs using DWARF info, so that userspace can be unwound
-
- . While this is running, run something like "sleep 5s".
-
- . If we decide to add tv_nsec as well, then it becomes:
-
- int probe(hrtimer_nanosleep, rqtp->tv_sec rqtp->tv_nsec)(void *ctx, int err, long sec, long nsec)
-
- I.e. add where it comes from (rqtp->tv_nsec) and where it will be
- accessible in the function body (nsec)
-
- # perf trace --no-syscalls -e tools/perf/examples/bpf/5sec.c/call-graph=dwarf/
- 0.000 perf_bpf_probe:func:(ffffffff9811b5f0) tv_sec=5
- hrtimer_nanosleep ([kernel.kallsyms])
- __x64_sys_nanosleep ([kernel.kallsyms])
- do_syscall_64 ([kernel.kallsyms])
- entry_SYSCALL_64 ([kernel.kallsyms])
- __GI___nanosleep (/usr/lib64/libc-2.26.so)
- rpl_nanosleep (/usr/bin/sleep)
- xnanosleep (/usr/bin/sleep)
- main (/usr/bin/sleep)
- __libc_start_main (/usr/lib64/libc-2.26.so)
- _start (/usr/bin/sleep)
- ^C#
-
- Copyright (C) 2018 Red Hat, Inc., Arnaldo Carvalho de Melo <[email protected]>
-*/
-
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-#define NSEC_PER_SEC 1000000000L
-
-SEC("hrtimer_nanosleep=hrtimer_nanosleep rqtp")
-int hrtimer_nanosleep(void *ctx, int err, long long sec)
-{
- return sec / NSEC_PER_SEC == 5ULL;
-}
-
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
deleted file mode 100644
index 9a03189d33d3..000000000000
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ /dev/null
@@ -1,417 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Augment the raw_syscalls tracepoints with the contents of the pointer arguments.
- *
- * Test it with:
- *
- * perf trace -e tools/perf/examples/bpf/augmented_raw_syscalls.c cat /etc/passwd > /dev/null
- *
- * This exactly matches what is marshalled into the raw_syscall:sys_enter
- * payload expected by the 'perf trace' beautifiers.
- *
- * For now it just uses the existing tracepoint augmentation code in 'perf
- * trace', in the next csets we'll hook up these with the sys_enter/sys_exit
- * code that will combine entry/exit in a strace like way.
- */
-
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-#include <linux/limits.h>
-
-// FIXME: These should come from system headers
-typedef char bool;
-typedef int pid_t;
-typedef long long int __s64;
-typedef __s64 time64_t;
-
-struct timespec64 {
- time64_t tv_sec;
- long int tv_nsec;
-};
-
-/* bpf-output associated map */
-struct __augmented_syscalls__ {
- __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
- __type(key, int);
- __type(value, __u32);
- __uint(max_entries, __NR_CPUS__);
-} __augmented_syscalls__ SEC(".maps");
-
-/*
- * What to augment at entry?
- *
- * Pointer arg payloads (filenames, etc) passed from userspace to the kernel
- */
-struct syscalls_sys_enter {
- __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
- __type(key, __u32);
- __type(value, __u32);
- __uint(max_entries, 512);
-} syscalls_sys_enter SEC(".maps");
-
-/*
- * What to augment at exit?
- *
- * Pointer arg payloads returned from the kernel (struct stat, etc) to userspace.
- */
-struct syscalls_sys_exit {
- __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
- __type(key, __u32);
- __type(value, __u32);
- __uint(max_entries, 512);
-} syscalls_sys_exit SEC(".maps");
-
-struct syscall_enter_args {
- unsigned long long common_tp_fields;
- long syscall_nr;
- unsigned long args[6];
-};
-
-struct syscall_exit_args {
- unsigned long long common_tp_fields;
- long syscall_nr;
- long ret;
-};
-
-struct augmented_arg {
- unsigned int size;
- int err;
- char value[PATH_MAX];
-};
-
-struct pids_filtered {
- __uint(type, BPF_MAP_TYPE_HASH);
- __type(key, pid_t);
- __type(value, bool);
- __uint(max_entries, 64);
-} pids_filtered SEC(".maps");
-
-/*
- * Desired design of maximum size and alignment (see RFC2553)
- */
-#define SS_MAXSIZE 128 /* Implementation specific max size */
-
-typedef unsigned short sa_family_t;
-
-/*
- * FIXME: Should come from system headers
- *
- * The definition uses anonymous union and struct in order to control the
- * default alignment.
- */
-struct sockaddr_storage {
- union {
- struct {
- sa_family_t ss_family; /* address family */
- /* Following field(s) are implementation specific */
- char __data[SS_MAXSIZE - sizeof(unsigned short)];
- /* space to achieve desired size, */
- /* _SS_MAXSIZE value minus size of ss_family */
- };
- void *__align; /* implementation specific desired alignment */
- };
-};
-
-struct augmented_args_payload {
- struct syscall_enter_args args;
- union {
- struct {
- struct augmented_arg arg, arg2;
- };
- struct sockaddr_storage saddr;
- char __data[sizeof(struct augmented_arg)];
- };
-};
-
-// We need more tmp space than the BPF stack can give us
-struct augmented_args_tmp {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, int);
- __type(value, struct augmented_args_payload);
- __uint(max_entries, 1);
-} augmented_args_tmp SEC(".maps");
-
-static inline struct augmented_args_payload *augmented_args_payload(void)
-{
- int key = 0;
- return bpf_map_lookup_elem(&augmented_args_tmp, &key);
-}
-
-static inline int augmented__output(void *ctx, struct augmented_args_payload *args, int len)
-{
- /* If perf_event_output fails, return non-zero so that it gets recorded unaugmented */
- return bpf_perf_event_output(ctx, &__augmented_syscalls__, BPF_F_CURRENT_CPU, args, len);
-}
-
-static inline
-unsigned int augmented_arg__read_str(struct augmented_arg *augmented_arg, const void *arg, unsigned int arg_len)
-{
- unsigned int augmented_len = sizeof(*augmented_arg);
- int string_len = bpf_probe_read_str(&augmented_arg->value, arg_len, arg);
-
- augmented_arg->size = augmented_arg->err = 0;
- /*
- * probe_read_str may return < 0, e.g. -EFAULT
- * So we leave that in the augmented_arg->size that userspace will
- */
- if (string_len > 0) {
- augmented_len -= sizeof(augmented_arg->value) - string_len;
- augmented_len &= sizeof(augmented_arg->value) - 1;
- augmented_arg->size = string_len;
- } else {
- /*
- * So that username notice the error while still being able
- * to skip this augmented arg record
- */
- augmented_arg->err = string_len;
- augmented_len = offsetof(struct augmented_arg, value);
- }
-
- return augmented_len;
-}
-
-SEC("!raw_syscalls:unaugmented")
-int syscall_unaugmented(struct syscall_enter_args *args)
-{
- return 1;
-}
-
-/*
- * These will be tail_called from SEC("raw_syscalls:sys_enter"), so will find in
- * augmented_args_tmp what was read by that raw_syscalls:sys_enter and go
- * on from there, reading the first syscall arg as a string, i.e. open's
- * filename.
- */
-SEC("!syscalls:sys_enter_connect")
-int sys_enter_connect(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *sockaddr_arg = (const void *)args->args[1];
- unsigned int socklen = args->args[2];
- unsigned int len = sizeof(augmented_args->args);
-
- if (augmented_args == NULL)
- return 1; /* Failure: don't filter */
-
- if (socklen > sizeof(augmented_args->saddr))
- socklen = sizeof(augmented_args->saddr);
-
- bpf_probe_read(&augmented_args->saddr, socklen, sockaddr_arg);
-
- return augmented__output(args, augmented_args, len + socklen);
-}
-
-SEC("!syscalls:sys_enter_sendto")
-int sys_enter_sendto(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *sockaddr_arg = (const void *)args->args[4];
- unsigned int socklen = args->args[5];
- unsigned int len = sizeof(augmented_args->args);
-
- if (augmented_args == NULL)
- return 1; /* Failure: don't filter */
-
- if (socklen > sizeof(augmented_args->saddr))
- socklen = sizeof(augmented_args->saddr);
-
- bpf_probe_read(&augmented_args->saddr, socklen, sockaddr_arg);
-
- return augmented__output(args, augmented_args, len + socklen);
-}
-
-SEC("!syscalls:sys_enter_open")
-int sys_enter_open(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *filename_arg = (const void *)args->args[0];
- unsigned int len = sizeof(augmented_args->args);
-
- if (augmented_args == NULL)
- return 1; /* Failure: don't filter */
-
- len += augmented_arg__read_str(&augmented_args->arg, filename_arg, sizeof(augmented_args->arg.value));
-
- return augmented__output(args, augmented_args, len);
-}
-
-SEC("!syscalls:sys_enter_openat")
-int sys_enter_openat(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *filename_arg = (const void *)args->args[1];
- unsigned int len = sizeof(augmented_args->args);
-
- if (augmented_args == NULL)
- return 1; /* Failure: don't filter */
-
- len += augmented_arg__read_str(&augmented_args->arg, filename_arg, sizeof(augmented_args->arg.value));
-
- return augmented__output(args, augmented_args, len);
-}
-
-SEC("!syscalls:sys_enter_rename")
-int sys_enter_rename(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *oldpath_arg = (const void *)args->args[0],
- *newpath_arg = (const void *)args->args[1];
- unsigned int len = sizeof(augmented_args->args), oldpath_len;
-
- if (augmented_args == NULL)
- return 1; /* Failure: don't filter */
-
- oldpath_len = augmented_arg__read_str(&augmented_args->arg, oldpath_arg, sizeof(augmented_args->arg.value));
- len += oldpath_len + augmented_arg__read_str((void *)(&augmented_args->arg) + oldpath_len, newpath_arg, sizeof(augmented_args->arg.value));
-
- return augmented__output(args, augmented_args, len);
-}
-
-SEC("!syscalls:sys_enter_renameat")
-int sys_enter_renameat(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *oldpath_arg = (const void *)args->args[1],
- *newpath_arg = (const void *)args->args[3];
- unsigned int len = sizeof(augmented_args->args), oldpath_len;
-
- if (augmented_args == NULL)
- return 1; /* Failure: don't filter */
-
- oldpath_len = augmented_arg__read_str(&augmented_args->arg, oldpath_arg, sizeof(augmented_args->arg.value));
- len += oldpath_len + augmented_arg__read_str((void *)(&augmented_args->arg) + oldpath_len, newpath_arg, sizeof(augmented_args->arg.value));
-
- return augmented__output(args, augmented_args, len);
-}
-
-#define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
-
-// we need just the start, get the size to then copy it
-struct perf_event_attr_size {
- __u32 type;
- /*
- * Size of the attr structure, for fwd/bwd compat.
- */
- __u32 size;
-};
-
-SEC("!syscalls:sys_enter_perf_event_open")
-int sys_enter_perf_event_open(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const struct perf_event_attr_size *attr = (const struct perf_event_attr_size *)args->args[0], *attr_read;
- unsigned int len = sizeof(augmented_args->args);
-
- if (augmented_args == NULL)
- goto failure;
-
- if (bpf_probe_read(&augmented_args->__data, sizeof(*attr), attr) < 0)
- goto failure;
-
- attr_read = (const struct perf_event_attr_size *)augmented_args->__data;
-
- __u32 size = attr_read->size;
-
- if (!size)
- size = PERF_ATTR_SIZE_VER0;
-
- if (size > sizeof(augmented_args->__data))
- goto failure;
-
- // Now that we read attr->size and tested it against the size limits, read it completely
- if (bpf_probe_read(&augmented_args->__data, size, attr) < 0)
- goto failure;
-
- return augmented__output(args, augmented_args, len + size);
-failure:
- return 1; /* Failure: don't filter */
-}
-
-SEC("!syscalls:sys_enter_clock_nanosleep")
-int sys_enter_clock_nanosleep(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args = augmented_args_payload();
- const void *rqtp_arg = (const void *)args->args[2];
- unsigned int len = sizeof(augmented_args->args);
- __u32 size = sizeof(struct timespec64);
-
- if (augmented_args == NULL)
- goto failure;
-
- if (size > sizeof(augmented_args->__data))
- goto failure;
-
- bpf_probe_read(&augmented_args->__data, size, rqtp_arg);
-
- return augmented__output(args, augmented_args, len + size);
-failure:
- return 1; /* Failure: don't filter */
-}
-
-static pid_t getpid(void)
-{
- return bpf_get_current_pid_tgid();
-}
-
-static bool pid_filter__has(struct pids_filtered *pids, pid_t pid)
-{
- return bpf_map_lookup_elem(pids, &pid) != NULL;
-}
-
-SEC("raw_syscalls:sys_enter")
-int sys_enter(struct syscall_enter_args *args)
-{
- struct augmented_args_payload *augmented_args;
- /*
- * We start len, the amount of data that will be in the perf ring
- * buffer, if this is not filtered out by one of pid_filter__has(),
- * syscall->enabled, etc, with the non-augmented raw syscall payload,
- * i.e. sizeof(augmented_args->args).
- *
- * We'll add to this as we add augmented syscalls right after that
- * initial, non-augmented raw_syscalls:sys_enter payload.
- */
- unsigned int len = sizeof(augmented_args->args);
-
- if (pid_filter__has(&pids_filtered, getpid()))
- return 0;
-
- augmented_args = augmented_args_payload();
- if (augmented_args == NULL)
- return 1;
-
- bpf_probe_read(&augmented_args->args, sizeof(augmented_args->args), args);
-
- /*
- * Jump to syscall specific augmenter, even if the default one,
- * "!raw_syscalls:unaugmented" that will just return 1 to return the
- * unaugmented tracepoint payload.
- */
- bpf_tail_call(args, &syscalls_sys_enter, augmented_args->args.syscall_nr);
-
- // If not found on the PROG_ARRAY syscalls map, then we're filtering it:
- return 0;
-}
-
-SEC("raw_syscalls:sys_exit")
-int sys_exit(struct syscall_exit_args *args)
-{
- struct syscall_exit_args exit_args;
-
- if (pid_filter__has(&pids_filtered, getpid()))
- return 0;
-
- bpf_probe_read(&exit_args, sizeof(exit_args), args);
- /*
- * Jump to syscall specific return augmenter, even if the default one,
- * "!raw_syscalls:unaugmented" that will just return 1 to return the
- * unaugmented tracepoint payload.
- */
- bpf_tail_call(args, &syscalls_sys_exit, exit_args.syscall_nr);
- /*
- * If not found on the PROG_ARRAY syscalls map, then we're filtering it:
- */
- return 0;
-}
-
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/empty.c b/tools/perf/examples/bpf/empty.c
deleted file mode 100644
index 3e296c0c53d7..000000000000
--- a/tools/perf/examples/bpf/empty.c
+++ /dev/null
@@ -1,12 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-struct syscall_enter_args;
-
-SEC("raw_syscalls:sys_enter")
-int sys_enter(struct syscall_enter_args *args)
-{
- return 0;
-}
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/hello.c b/tools/perf/examples/bpf/hello.c
deleted file mode 100644
index e9080b0df158..000000000000
--- a/tools/perf/examples/bpf/hello.c
+++ /dev/null
@@ -1,27 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-struct __bpf_stdout__ {
- __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
- __type(key, int);
- __type(value, __u32);
- __uint(max_entries, __NR_CPUS__);
-} __bpf_stdout__ SEC(".maps");
-
-#define puts(from) \
- ({ const int __len = sizeof(from); \
- char __from[sizeof(from)] = from; \
- bpf_perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \
- &__from, __len & (sizeof(from) - 1)); })
-
-struct syscall_enter_args;
-
-SEC("raw_syscalls:sys_enter")
-int sys_enter(struct syscall_enter_args *args)
-{
- puts("Hello, world\n");
- return 0;
-}
-
-char _license[] SEC("license") = "GPL";
diff --git a/tools/perf/examples/bpf/sys_enter_openat.c b/tools/perf/examples/bpf/sys_enter_openat.c
deleted file mode 100644
index c4481c390d23..000000000000
--- a/tools/perf/examples/bpf/sys_enter_openat.c
+++ /dev/null
@@ -1,33 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Hook into 'openat' syscall entry tracepoint
- *
- * Test it with:
- *
- * perf trace -e tools/perf/examples/bpf/sys_enter_openat.c cat /etc/passwd > /dev/null
- *
- * It'll catch some openat syscalls related to the dynamic linked and
- * the last one should be the one for '/etc/passwd'.
- *
- * The syscall_enter_openat_args can be used to get the syscall fields
- * and use them for filtering calls, i.e. use in expressions for
- * the return value.
- */
-
-#include <bpf/bpf.h>
-
-struct syscall_enter_openat_args {
- unsigned long long unused;
- long syscall_nr;
- long dfd;
- char *filename_ptr;
- long flags;
- long mode;
-};
-
-int syscall_enter(openat)(struct syscall_enter_openat_args *args)
-{
- return 1;
-}
-
-license(GPL);
Powered by cgit, Gruvboxed by Blaster4385.