mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull perf changes from Ingo Molnar: "Core kernel changes: - One of the more interesting features in this cycle is the ability to attach eBPF programs (user-defined, sandboxed bytecode executed by the kernel) to kprobes. This allows user-defined instrumentation on a live kernel image that can never crash, hang or interfere with the kernel negatively. (Right now it's limited to root-only, but in the future we might allow unprivileged use as well.) (Alexei Starovoitov) - Another non-trivial feature is per event clockid support: this allows, amongst other things, the selection of different clock sources for event timestamps traced via perf. This feature is sought by people who'd like to merge perf generated events with external events that were measured with different clocks: - cluster wide profiling - for system wide tracing with user-space events, - JIT profiling events etc. Matching perf tooling support is added as well, available via the -k, --clockid <clockid> parameter to perf record et al. (Peter Zijlstra) Hardware enablement kernel changes: - x86 Intel Processor Trace (PT) support: which is a hardware tracer on steroids, available on Broadwell CPUs. The hardware trace stream is directly output into the user-space ring-buffer, using the 'AUX' data format extension that was added to the perf core to support hardware constraints such as the necessity to have the tracing buffer physically contiguous. This patch-set was developed for two years and this is the result. A simple way to make use of this is to use BTS tracing, the PT driver emulates BTS output - available via the 'intel_bts' PMU. More explicit PT specific tooling support is in the works as well - will probably be ready by 4.2. (Alexander Shishkin, Peter Zijlstra) - x86 Intel Cache QoS Monitoring (CQM) support: this is a hardware feature of Intel Xeon CPUs that allows the measurement and allocation/partitioning of caches to individual workloads. These kernel changes expose the measurement side as a new PMU driver, which exposes various QoS related PMU events. (The partitioning change is work in progress and is planned to be merged as a cgroup extension.) (Matt Fleming, Peter Zijlstra; CPU feature detection by Peter P Waskiewicz Jr) - x86 Intel Haswell LBR call stack support: this is a new Haswell feature that allows the hardware recording of call chains, plus tooling support. To activate this feature you have to enable it via the new 'lbr' call-graph recording option: perf record --call-graph lbr perf report or: perf top --call-graph lbr This hardware feature is a lot faster than stack walk or dwarf based unwinding, but has some limitations: - It reuses the current LBR facility, so LBR call stack and branch record can not be enabled at the same time. - It is only available for user-space callchains. (Yan, Zheng) - x86 Intel Broadwell CPU support and various event constraints and event table fixes for earlier models. (Andi Kleen) - x86 Intel HT CPUs event scheduling workarounds. This is a complex CPU bug affecting the SNB,IVB,HSW families that results in counter value corruption. The mitigation code is automatically enabled and is transparent. (Maria Dimakopoulou, Stephane Eranian) The perf tooling side had a ton of changes in this cycle as well, so I'm only able to list the user visible changes here, in addition to the tooling changes outlined above: User visible changes affecting all tools: - Improve support of compressed kernel modules (Jiri Olsa) - Save DSO loading errno to better report errors (Arnaldo Carvalho de Melo) - Bash completion for subcommands (Yunlong Song) - Add 'I' event modifier for perf_event_attr.exclude_idle bit (Jiri Olsa) - Support missing -f to override perf.data file ownership. (Yunlong Song) - Show the first event with an invalid filter (David Ahern, Arnaldo Carvalho de Melo) User visible changes in individual tools: 'perf data': New tool for converting perf.data to other formats, initially for the CTF (Common Trace Format) from LTTng (Jiri Olsa, Sebastian Siewior) 'perf diff': Add --kallsyms option (David Ahern) 'perf list': Allow listing events with 'tracepoint' prefix (Yunlong Song) Sort the output of the command (Yunlong Song) 'perf kmem': Respect -i option (Jiri Olsa) Print big numbers using thousands' group (Namhyung Kim) Allow -v option (Namhyung Kim) Fix alignment of slab result table (Namhyung Kim) 'perf probe': Support multiple probes on different binaries on the same command line (Masami Hiramatsu) Support unnamed union/structure members data collection. (Masami Hiramatsu) Check kprobes blacklist when adding new events. (Masami Hiramatsu) 'perf record': Teach 'perf record' about perf_event_attr.clockid (Peter Zijlstra) Support recording running/enabled time (Andi Kleen) 'perf sched': Improve the performance of 'perf sched replay' on high CPU core count machines (Yunlong Song) 'perf report' and 'perf top': Allow annotating entries in callchains in the hists browser (Arnaldo Carvalho de Melo) Indicate which callchain entries are annotated in the TUI hists browser (Arnaldo Carvalho de Melo) Add pid/tid filtering to 'report' and 'script' commands (David Ahern) Consider PERF_RECORD_ events with cpumode == 0 in 'perf top', removing one cause of long term memory usage buildup, i.e. not processing PERF_RECORD_EXIT events (Arnaldo Carvalho de Melo) 'perf stat': Report unsupported events properly (Suzuki K. Poulose) Output running time and run/enabled ratio in CSV mode (Andi Kleen) 'perf trace': Handle legacy syscalls tracepoints (David Ahern, Arnaldo Carvalho de Melo) Only insert blank duration bracket when tracing syscalls (Arnaldo Carvalho de Melo) Filter out the trace pid when no threads are specified (Arnaldo Carvalho de Melo) Dump stack on segfaults (Arnaldo Carvalho de Melo) No need to explicitely enable evsels for workload started from perf, let it be enabled via perf_event_attr.enable_on_exec, removing some events that take place in the 'perf trace' before a workload is really started by it. (Arnaldo Carvalho de Melo) Allow mixing with tracepoints and suppressing plain syscalls. (Arnaldo Carvalho de Melo) There's also been a ton of infrastructure work done, such as the split-out of perf's build system into tools/build/ and other changes - see the shortlog and changelog for details" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (358 commits) perf/x86/intel/pt: Clean up the control flow in pt_pmu_hw_init() perf evlist: Fix type for references to data_head/tail perf probe: Check the orphaned -x option perf probe: Support multiple probes on different binaries perf buildid-list: Fix segfault when show DSOs with hits perf tools: Fix cross-endian analysis perf tools: Fix error path to do closedir() when synthesizing threads perf tools: Fix synthesizing fork_event.ppid for non-main thread perf tools: Add 'I' event modifier for exclude_idle bit perf report: Don't call map__kmap if map is NULL. perf tests: Fix attr tests perf probe: Fix ARM 32 building error perf tools: Merge all perf_event_attr print functions perf record: Add clockid parameter perf sched replay: Use replay_repeat to calculate the runavg of cpu usage instead of the default value 10 perf sched replay: Support using -f to override perf.data file ownership perf sched replay: Fix the EMFILE error caused by the limitation of the maximum open files perf sched replay: Handle the dead halt of sem_wait when create_tasks() fails for any task perf sched replay: Fix the segmentation fault problem caused by pr_err in threads perf sched replay: Realloc the memory of pid_to_task stepwise to adapt to the different pid_max configurations ...
627 lines
19 KiB
C
627 lines
19 KiB
C
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#ifndef _LINUX_FTRACE_EVENT_H
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#define _LINUX_FTRACE_EVENT_H
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#include <linux/ring_buffer.h>
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#include <linux/trace_seq.h>
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#include <linux/percpu.h>
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#include <linux/hardirq.h>
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#include <linux/perf_event.h>
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#include <linux/tracepoint.h>
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struct trace_array;
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struct trace_buffer;
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struct tracer;
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struct dentry;
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struct bpf_prog;
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struct trace_print_flags {
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unsigned long mask;
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const char *name;
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};
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struct trace_print_flags_u64 {
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unsigned long long mask;
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const char *name;
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};
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const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
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unsigned long flags,
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const struct trace_print_flags *flag_array);
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const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
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const struct trace_print_flags *symbol_array);
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#if BITS_PER_LONG == 32
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const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
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unsigned long long val,
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const struct trace_print_flags_u64
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*symbol_array);
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#endif
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const char *ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
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unsigned int bitmask_size);
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const char *ftrace_print_hex_seq(struct trace_seq *p,
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const unsigned char *buf, int len);
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const char *ftrace_print_array_seq(struct trace_seq *p,
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const void *buf, int buf_len,
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size_t el_size);
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struct trace_iterator;
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struct trace_event;
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int ftrace_raw_output_prep(struct trace_iterator *iter,
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struct trace_event *event);
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/*
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* The trace entry - the most basic unit of tracing. This is what
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* is printed in the end as a single line in the trace output, such as:
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*
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* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
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*/
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struct trace_entry {
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unsigned short type;
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unsigned char flags;
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unsigned char preempt_count;
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int pid;
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};
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#define FTRACE_MAX_EVENT \
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((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
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/*
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* Trace iterator - used by printout routines who present trace
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* results to users and which routines might sleep, etc:
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*/
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struct trace_iterator {
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struct trace_array *tr;
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struct tracer *trace;
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struct trace_buffer *trace_buffer;
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void *private;
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int cpu_file;
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struct mutex mutex;
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struct ring_buffer_iter **buffer_iter;
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unsigned long iter_flags;
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/* trace_seq for __print_flags() and __print_symbolic() etc. */
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struct trace_seq tmp_seq;
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cpumask_var_t started;
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/* it's true when current open file is snapshot */
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bool snapshot;
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/* The below is zeroed out in pipe_read */
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struct trace_seq seq;
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struct trace_entry *ent;
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unsigned long lost_events;
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int leftover;
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int ent_size;
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int cpu;
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u64 ts;
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loff_t pos;
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long idx;
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/* All new field here will be zeroed out in pipe_read */
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};
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enum trace_iter_flags {
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TRACE_FILE_LAT_FMT = 1,
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TRACE_FILE_ANNOTATE = 2,
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TRACE_FILE_TIME_IN_NS = 4,
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};
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typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
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int flags, struct trace_event *event);
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struct trace_event_functions {
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trace_print_func trace;
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trace_print_func raw;
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trace_print_func hex;
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trace_print_func binary;
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};
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struct trace_event {
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struct hlist_node node;
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struct list_head list;
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int type;
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struct trace_event_functions *funcs;
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};
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extern int register_ftrace_event(struct trace_event *event);
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extern int unregister_ftrace_event(struct trace_event *event);
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/* Return values for print_line callback */
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enum print_line_t {
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TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
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TRACE_TYPE_HANDLED = 1,
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TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
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TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
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};
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/*
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* Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq
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* overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function
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* simplifies those functions and keeps them in sync.
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*/
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static inline enum print_line_t trace_handle_return(struct trace_seq *s)
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{
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return trace_seq_has_overflowed(s) ?
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TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED;
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}
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void tracing_generic_entry_update(struct trace_entry *entry,
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unsigned long flags,
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int pc);
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struct ftrace_event_file;
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struct ring_buffer_event *
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trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer,
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struct ftrace_event_file *ftrace_file,
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int type, unsigned long len,
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unsigned long flags, int pc);
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struct ring_buffer_event *
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trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
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int type, unsigned long len,
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unsigned long flags, int pc);
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void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
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struct ring_buffer_event *event,
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unsigned long flags, int pc);
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void trace_buffer_unlock_commit(struct ring_buffer *buffer,
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struct ring_buffer_event *event,
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unsigned long flags, int pc);
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void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer,
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struct ring_buffer_event *event,
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unsigned long flags, int pc,
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struct pt_regs *regs);
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void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
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struct ring_buffer_event *event);
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void tracing_record_cmdline(struct task_struct *tsk);
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int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
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struct event_filter;
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enum trace_reg {
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TRACE_REG_REGISTER,
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TRACE_REG_UNREGISTER,
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#ifdef CONFIG_PERF_EVENTS
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TRACE_REG_PERF_REGISTER,
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TRACE_REG_PERF_UNREGISTER,
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TRACE_REG_PERF_OPEN,
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TRACE_REG_PERF_CLOSE,
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TRACE_REG_PERF_ADD,
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TRACE_REG_PERF_DEL,
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#endif
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};
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struct ftrace_event_call;
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struct ftrace_event_class {
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const char *system;
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void *probe;
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#ifdef CONFIG_PERF_EVENTS
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void *perf_probe;
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#endif
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int (*reg)(struct ftrace_event_call *event,
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enum trace_reg type, void *data);
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int (*define_fields)(struct ftrace_event_call *);
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struct list_head *(*get_fields)(struct ftrace_event_call *);
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struct list_head fields;
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int (*raw_init)(struct ftrace_event_call *);
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};
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extern int ftrace_event_reg(struct ftrace_event_call *event,
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enum trace_reg type, void *data);
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int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
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char *fmt, ...);
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int ftrace_event_define_field(struct ftrace_event_call *call,
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char *type, int len, char *item, int offset,
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int field_size, int sign, int filter);
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struct ftrace_event_buffer {
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struct ring_buffer *buffer;
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struct ring_buffer_event *event;
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struct ftrace_event_file *ftrace_file;
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void *entry;
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unsigned long flags;
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int pc;
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};
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void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
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struct ftrace_event_file *ftrace_file,
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unsigned long len);
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void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer);
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int ftrace_event_define_field(struct ftrace_event_call *call,
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char *type, int len, char *item, int offset,
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int field_size, int sign, int filter);
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enum {
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TRACE_EVENT_FL_FILTERED_BIT,
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TRACE_EVENT_FL_CAP_ANY_BIT,
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TRACE_EVENT_FL_NO_SET_FILTER_BIT,
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TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
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TRACE_EVENT_FL_WAS_ENABLED_BIT,
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TRACE_EVENT_FL_USE_CALL_FILTER_BIT,
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TRACE_EVENT_FL_TRACEPOINT_BIT,
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TRACE_EVENT_FL_KPROBE_BIT,
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};
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/*
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* Event flags:
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* FILTERED - The event has a filter attached
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* CAP_ANY - Any user can enable for perf
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* NO_SET_FILTER - Set when filter has error and is to be ignored
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* IGNORE_ENABLE - For ftrace internal events, do not enable with debugfs file
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* WAS_ENABLED - Set and stays set when an event was ever enabled
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* (used for module unloading, if a module event is enabled,
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* it is best to clear the buffers that used it).
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* USE_CALL_FILTER - For ftrace internal events, don't use file filter
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* TRACEPOINT - Event is a tracepoint
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* KPROBE - Event is a kprobe
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*/
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enum {
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TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
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TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
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TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
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TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
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TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
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TRACE_EVENT_FL_USE_CALL_FILTER = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT),
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TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
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TRACE_EVENT_FL_KPROBE = (1 << TRACE_EVENT_FL_KPROBE_BIT),
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};
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struct ftrace_event_call {
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struct list_head list;
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struct ftrace_event_class *class;
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union {
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char *name;
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/* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
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struct tracepoint *tp;
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};
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struct trace_event event;
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char *print_fmt;
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struct event_filter *filter;
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void *mod;
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void *data;
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/*
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* bit 0: filter_active
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* bit 1: allow trace by non root (cap any)
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* bit 2: failed to apply filter
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* bit 3: ftrace internal event (do not enable)
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* bit 4: Event was enabled by module
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* bit 5: use call filter rather than file filter
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* bit 6: Event is a tracepoint
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*/
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int flags; /* static flags of different events */
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#ifdef CONFIG_PERF_EVENTS
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int perf_refcount;
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struct hlist_head __percpu *perf_events;
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struct bpf_prog *prog;
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int (*perf_perm)(struct ftrace_event_call *,
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struct perf_event *);
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#endif
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};
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static inline const char *
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ftrace_event_name(struct ftrace_event_call *call)
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{
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if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
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return call->tp ? call->tp->name : NULL;
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else
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return call->name;
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}
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struct trace_array;
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struct ftrace_subsystem_dir;
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enum {
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FTRACE_EVENT_FL_ENABLED_BIT,
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FTRACE_EVENT_FL_RECORDED_CMD_BIT,
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FTRACE_EVENT_FL_FILTERED_BIT,
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FTRACE_EVENT_FL_NO_SET_FILTER_BIT,
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FTRACE_EVENT_FL_SOFT_MODE_BIT,
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FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
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FTRACE_EVENT_FL_TRIGGER_MODE_BIT,
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FTRACE_EVENT_FL_TRIGGER_COND_BIT,
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};
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/*
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* Ftrace event file flags:
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* ENABLED - The event is enabled
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* RECORDED_CMD - The comms should be recorded at sched_switch
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* FILTERED - The event has a filter attached
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* NO_SET_FILTER - Set when filter has error and is to be ignored
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* SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
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* SOFT_DISABLED - When set, do not trace the event (even though its
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* tracepoint may be enabled)
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* TRIGGER_MODE - When set, invoke the triggers associated with the event
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* TRIGGER_COND - When set, one or more triggers has an associated filter
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*/
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enum {
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FTRACE_EVENT_FL_ENABLED = (1 << FTRACE_EVENT_FL_ENABLED_BIT),
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FTRACE_EVENT_FL_RECORDED_CMD = (1 << FTRACE_EVENT_FL_RECORDED_CMD_BIT),
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FTRACE_EVENT_FL_FILTERED = (1 << FTRACE_EVENT_FL_FILTERED_BIT),
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FTRACE_EVENT_FL_NO_SET_FILTER = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT),
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FTRACE_EVENT_FL_SOFT_MODE = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT),
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FTRACE_EVENT_FL_SOFT_DISABLED = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT),
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FTRACE_EVENT_FL_TRIGGER_MODE = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT),
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FTRACE_EVENT_FL_TRIGGER_COND = (1 << FTRACE_EVENT_FL_TRIGGER_COND_BIT),
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};
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struct ftrace_event_file {
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struct list_head list;
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struct ftrace_event_call *event_call;
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struct event_filter *filter;
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struct dentry *dir;
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struct trace_array *tr;
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struct ftrace_subsystem_dir *system;
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struct list_head triggers;
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/*
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* 32 bit flags:
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* bit 0: enabled
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* bit 1: enabled cmd record
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* bit 2: enable/disable with the soft disable bit
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* bit 3: soft disabled
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* bit 4: trigger enabled
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*
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* Note: The bits must be set atomically to prevent races
|
|
* from other writers. Reads of flags do not need to be in
|
|
* sync as they occur in critical sections. But the way flags
|
|
* is currently used, these changes do not affect the code
|
|
* except that when a change is made, it may have a slight
|
|
* delay in propagating the changes to other CPUs due to
|
|
* caching and such. Which is mostly OK ;-)
|
|
*/
|
|
unsigned long flags;
|
|
atomic_t sm_ref; /* soft-mode reference counter */
|
|
atomic_t tm_ref; /* trigger-mode reference counter */
|
|
};
|
|
|
|
#define __TRACE_EVENT_FLAGS(name, value) \
|
|
static int __init trace_init_flags_##name(void) \
|
|
{ \
|
|
event_##name.flags |= value; \
|
|
return 0; \
|
|
} \
|
|
early_initcall(trace_init_flags_##name);
|
|
|
|
#define __TRACE_EVENT_PERF_PERM(name, expr...) \
|
|
static int perf_perm_##name(struct ftrace_event_call *tp_event, \
|
|
struct perf_event *p_event) \
|
|
{ \
|
|
return ({ expr; }); \
|
|
} \
|
|
static int __init trace_init_perf_perm_##name(void) \
|
|
{ \
|
|
event_##name.perf_perm = &perf_perm_##name; \
|
|
return 0; \
|
|
} \
|
|
early_initcall(trace_init_perf_perm_##name);
|
|
|
|
#define PERF_MAX_TRACE_SIZE 2048
|
|
|
|
#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
|
|
|
|
enum event_trigger_type {
|
|
ETT_NONE = (0),
|
|
ETT_TRACE_ONOFF = (1 << 0),
|
|
ETT_SNAPSHOT = (1 << 1),
|
|
ETT_STACKTRACE = (1 << 2),
|
|
ETT_EVENT_ENABLE = (1 << 3),
|
|
};
|
|
|
|
extern int filter_match_preds(struct event_filter *filter, void *rec);
|
|
|
|
extern int filter_check_discard(struct ftrace_event_file *file, void *rec,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
extern int call_filter_check_discard(struct ftrace_event_call *call, void *rec,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event);
|
|
extern enum event_trigger_type event_triggers_call(struct ftrace_event_file *file,
|
|
void *rec);
|
|
extern void event_triggers_post_call(struct ftrace_event_file *file,
|
|
enum event_trigger_type tt);
|
|
|
|
/**
|
|
* ftrace_trigger_soft_disabled - do triggers and test if soft disabled
|
|
* @file: The file pointer of the event to test
|
|
*
|
|
* If any triggers without filters are attached to this event, they
|
|
* will be called here. If the event is soft disabled and has no
|
|
* triggers that require testing the fields, it will return true,
|
|
* otherwise false.
|
|
*/
|
|
static inline bool
|
|
ftrace_trigger_soft_disabled(struct ftrace_event_file *file)
|
|
{
|
|
unsigned long eflags = file->flags;
|
|
|
|
if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
|
|
if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
|
|
event_triggers_call(file, NULL);
|
|
if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Helper function for event_trigger_unlock_commit{_regs}().
|
|
* If there are event triggers attached to this event that requires
|
|
* filtering against its fields, then they wil be called as the
|
|
* entry already holds the field information of the current event.
|
|
*
|
|
* It also checks if the event should be discarded or not.
|
|
* It is to be discarded if the event is soft disabled and the
|
|
* event was only recorded to process triggers, or if the event
|
|
* filter is active and this event did not match the filters.
|
|
*
|
|
* Returns true if the event is discarded, false otherwise.
|
|
*/
|
|
static inline bool
|
|
__event_trigger_test_discard(struct ftrace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry,
|
|
enum event_trigger_type *tt)
|
|
{
|
|
unsigned long eflags = file->flags;
|
|
|
|
if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
|
|
*tt = event_triggers_call(file, entry);
|
|
|
|
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags))
|
|
ring_buffer_discard_commit(buffer, event);
|
|
else if (!filter_check_discard(file, entry, buffer, event))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* event_trigger_unlock_commit - handle triggers and finish event commit
|
|
* @file: The file pointer assoctiated to the event
|
|
* @buffer: The ring buffer that the event is being written to
|
|
* @event: The event meta data in the ring buffer
|
|
* @entry: The event itself
|
|
* @irq_flags: The state of the interrupts at the start of the event
|
|
* @pc: The state of the preempt count at the start of the event.
|
|
*
|
|
* This is a helper function to handle triggers that require data
|
|
* from the event itself. It also tests the event against filters and
|
|
* if the event is soft disabled and should be discarded.
|
|
*/
|
|
static inline void
|
|
event_trigger_unlock_commit(struct ftrace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry, unsigned long irq_flags, int pc)
|
|
{
|
|
enum event_trigger_type tt = ETT_NONE;
|
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
|
|
trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
|
|
|
|
if (tt)
|
|
event_triggers_post_call(file, tt);
|
|
}
|
|
|
|
/**
|
|
* event_trigger_unlock_commit_regs - handle triggers and finish event commit
|
|
* @file: The file pointer assoctiated to the event
|
|
* @buffer: The ring buffer that the event is being written to
|
|
* @event: The event meta data in the ring buffer
|
|
* @entry: The event itself
|
|
* @irq_flags: The state of the interrupts at the start of the event
|
|
* @pc: The state of the preempt count at the start of the event.
|
|
*
|
|
* This is a helper function to handle triggers that require data
|
|
* from the event itself. It also tests the event against filters and
|
|
* if the event is soft disabled and should be discarded.
|
|
*
|
|
* Same as event_trigger_unlock_commit() but calls
|
|
* trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
|
|
*/
|
|
static inline void
|
|
event_trigger_unlock_commit_regs(struct ftrace_event_file *file,
|
|
struct ring_buffer *buffer,
|
|
struct ring_buffer_event *event,
|
|
void *entry, unsigned long irq_flags, int pc,
|
|
struct pt_regs *regs)
|
|
{
|
|
enum event_trigger_type tt = ETT_NONE;
|
|
|
|
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
|
|
trace_buffer_unlock_commit_regs(buffer, event,
|
|
irq_flags, pc, regs);
|
|
|
|
if (tt)
|
|
event_triggers_post_call(file, tt);
|
|
}
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx);
|
|
#else
|
|
static inline unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
enum {
|
|
FILTER_OTHER = 0,
|
|
FILTER_STATIC_STRING,
|
|
FILTER_DYN_STRING,
|
|
FILTER_PTR_STRING,
|
|
FILTER_TRACE_FN,
|
|
};
|
|
|
|
extern int trace_event_raw_init(struct ftrace_event_call *call);
|
|
extern int trace_define_field(struct ftrace_event_call *call, const char *type,
|
|
const char *name, int offset, int size,
|
|
int is_signed, int filter_type);
|
|
extern int trace_add_event_call(struct ftrace_event_call *call);
|
|
extern int trace_remove_event_call(struct ftrace_event_call *call);
|
|
|
|
#define is_signed_type(type) (((type)(-1)) < (type)1)
|
|
|
|
int trace_set_clr_event(const char *system, const char *event, int set);
|
|
|
|
/*
|
|
* The double __builtin_constant_p is because gcc will give us an error
|
|
* if we try to allocate the static variable to fmt if it is not a
|
|
* constant. Even with the outer if statement optimizing out.
|
|
*/
|
|
#define event_trace_printk(ip, fmt, args...) \
|
|
do { \
|
|
__trace_printk_check_format(fmt, ##args); \
|
|
tracing_record_cmdline(current); \
|
|
if (__builtin_constant_p(fmt)) { \
|
|
static const char *trace_printk_fmt \
|
|
__attribute__((section("__trace_printk_fmt"))) = \
|
|
__builtin_constant_p(fmt) ? fmt : NULL; \
|
|
\
|
|
__trace_bprintk(ip, trace_printk_fmt, ##args); \
|
|
} else \
|
|
__trace_printk(ip, fmt, ##args); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
struct perf_event;
|
|
|
|
DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
|
|
|
|
extern int perf_trace_init(struct perf_event *event);
|
|
extern void perf_trace_destroy(struct perf_event *event);
|
|
extern int perf_trace_add(struct perf_event *event, int flags);
|
|
extern void perf_trace_del(struct perf_event *event, int flags);
|
|
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
|
|
char *filter_str);
|
|
extern void ftrace_profile_free_filter(struct perf_event *event);
|
|
extern void *perf_trace_buf_prepare(int size, unsigned short type,
|
|
struct pt_regs **regs, int *rctxp);
|
|
|
|
static inline void
|
|
perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
|
|
u64 count, struct pt_regs *regs, void *head,
|
|
struct task_struct *task)
|
|
{
|
|
perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_FTRACE_EVENT_H */
|