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-rw-r--r--kernel/trace/trace.h470
1 files changed, 399 insertions, 71 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f69f86788c2..cc7a4f86403 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -5,7 +5,10 @@
#include <asm/atomic.h>
#include <linux/sched.h>
#include <linux/clocksource.h>
+#include <linux/ring_buffer.h>
#include <linux/mmiotrace.h>
+#include <linux/ftrace.h>
+#include <trace/boot.h>
enum trace_type {
__TRACE_FIRST_TYPE = 0,
@@ -13,38 +16,80 @@ enum trace_type {
TRACE_FN,
TRACE_CTX,
TRACE_WAKE,
+ TRACE_CONT,
TRACE_STACK,
+ TRACE_PRINT,
TRACE_SPECIAL,
TRACE_MMIO_RW,
TRACE_MMIO_MAP,
+ TRACE_BRANCH,
+ TRACE_BOOT_CALL,
+ TRACE_BOOT_RET,
+ TRACE_GRAPH_RET,
+ TRACE_GRAPH_ENT,
+ TRACE_USER_STACK,
+ TRACE_HW_BRANCHES,
+ TRACE_POWER,
__TRACE_LAST_TYPE
};
/*
+ * The trace entry - the most basic unit of tracing. This is what
+ * is printed in the end as a single line in the trace output, such as:
+ *
+ * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
+ */
+struct trace_entry {
+ unsigned char type;
+ unsigned char cpu;
+ unsigned char flags;
+ unsigned char preempt_count;
+ int pid;
+ int tgid;
+};
+
+/*
* Function trace entry - function address and parent function addres:
*/
struct ftrace_entry {
+ struct trace_entry ent;
unsigned long ip;
unsigned long parent_ip;
};
+/* Function call entry */
+struct ftrace_graph_ent_entry {
+ struct trace_entry ent;
+ struct ftrace_graph_ent graph_ent;
+};
+
+/* Function return entry */
+struct ftrace_graph_ret_entry {
+ struct trace_entry ent;
+ struct ftrace_graph_ret ret;
+};
+extern struct tracer boot_tracer;
+
/*
* Context switch trace entry - which task (and prio) we switched from/to:
*/
struct ctx_switch_entry {
+ struct trace_entry ent;
unsigned int prev_pid;
unsigned char prev_prio;
unsigned char prev_state;
unsigned int next_pid;
unsigned char next_prio;
unsigned char next_state;
+ unsigned int next_cpu;
};
/*
* Special (free-form) trace entry:
*/
struct special_entry {
+ struct trace_entry ent;
unsigned long arg1;
unsigned long arg2;
unsigned long arg3;
@@ -57,33 +102,94 @@ struct special_entry {
#define FTRACE_STACK_ENTRIES 8
struct stack_entry {
+ struct trace_entry ent;
+ unsigned long caller[FTRACE_STACK_ENTRIES];
+};
+
+struct userstack_entry {
+ struct trace_entry ent;
unsigned long caller[FTRACE_STACK_ENTRIES];
};
/*
- * The trace entry - the most basic unit of tracing. This is what
- * is printed in the end as a single line in the trace output, such as:
- *
- * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
+ * ftrace_printk entry:
*/
-struct trace_entry {
- char type;
- char cpu;
- char flags;
- char preempt_count;
- int pid;
- cycle_t t;
- union {
- struct ftrace_entry fn;
- struct ctx_switch_entry ctx;
- struct special_entry special;
- struct stack_entry stack;
- struct mmiotrace_rw mmiorw;
- struct mmiotrace_map mmiomap;
- };
+struct print_entry {
+ struct trace_entry ent;
+ unsigned long ip;
+ int depth;
+ char buf[];
+};
+
+#define TRACE_OLD_SIZE 88
+
+struct trace_field_cont {
+ unsigned char type;
+ /* Temporary till we get rid of this completely */
+ char buf[TRACE_OLD_SIZE - 1];
};
-#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
+struct trace_mmiotrace_rw {
+ struct trace_entry ent;
+ struct mmiotrace_rw rw;
+};
+
+struct trace_mmiotrace_map {
+ struct trace_entry ent;
+ struct mmiotrace_map map;
+};
+
+struct trace_boot_call {
+ struct trace_entry ent;
+ struct boot_trace_call boot_call;
+};
+
+struct trace_boot_ret {
+ struct trace_entry ent;
+ struct boot_trace_ret boot_ret;
+};
+
+#define TRACE_FUNC_SIZE 30
+#define TRACE_FILE_SIZE 20
+struct trace_branch {
+ struct trace_entry ent;
+ unsigned line;
+ char func[TRACE_FUNC_SIZE+1];
+ char file[TRACE_FILE_SIZE+1];
+ char correct;
+};
+
+struct hw_branch_entry {
+ struct trace_entry ent;
+ u64 from;
+ u64 to;
+};
+
+struct trace_power {
+ struct trace_entry ent;
+ struct power_trace state_data;
+};
+
+/*
+ * trace_flag_type is an enumeration that holds different
+ * states when a trace occurs. These are:
+ * IRQS_OFF - interrupts were disabled
+ * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
+ * NEED_RESCED - reschedule is requested
+ * HARDIRQ - inside an interrupt handler
+ * SOFTIRQ - inside a softirq handler
+ * CONT - multiple entries hold the trace item
+ */
+enum trace_flag_type {
+ TRACE_FLAG_IRQS_OFF = 0x01,
+ TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
+ TRACE_FLAG_NEED_RESCHED = 0x04,
+ TRACE_FLAG_HARDIRQ = 0x08,
+ TRACE_FLAG_SOFTIRQ = 0x10,
+ TRACE_FLAG_CONT = 0x20,
+};
+
+#define TRACE_BUF_SIZE 1024
/*
* The CPU trace array - it consists of thousands of trace entries
@@ -91,16 +197,9 @@ struct trace_entry {
* the trace, etc.)
*/
struct trace_array_cpu {
- struct list_head trace_pages;
atomic_t disabled;
- raw_spinlock_t lock;
- struct lock_class_key lock_key;
/* these fields get copied into max-trace: */
- unsigned trace_head_idx;
- unsigned trace_tail_idx;
- void *trace_head; /* producer */
- void *trace_tail; /* consumer */
unsigned long trace_idx;
unsigned long overrun;
unsigned long saved_latency;
@@ -124,37 +223,123 @@ struct trace_iterator;
* They have on/off state as well:
*/
struct trace_array {
+ struct ring_buffer *buffer;
unsigned long entries;
- long ctrl;
int cpu;
cycle_t time_start;
struct task_struct *waiter;
struct trace_array_cpu *data[NR_CPUS];
};
+#define FTRACE_CMP_TYPE(var, type) \
+ __builtin_types_compatible_p(typeof(var), type *)
+
+#undef IF_ASSIGN
+#define IF_ASSIGN(var, entry, etype, id) \
+ if (FTRACE_CMP_TYPE(var, etype)) { \
+ var = (typeof(var))(entry); \
+ WARN_ON(id && (entry)->type != id); \
+ break; \
+ }
+
+/* Will cause compile errors if type is not found. */
+extern void __ftrace_bad_type(void);
+
+/*
+ * The trace_assign_type is a verifier that the entry type is
+ * the same as the type being assigned. To add new types simply
+ * add a line with the following format:
+ *
+ * IF_ASSIGN(var, ent, type, id);
+ *
+ * Where "type" is the trace type that includes the trace_entry
+ * as the "ent" item. And "id" is the trace identifier that is
+ * used in the trace_type enum.
+ *
+ * If the type can have more than one id, then use zero.
+ */
+#define trace_assign_type(var, ent) \
+ do { \
+ IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
+ IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
+ IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
+ IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
+ IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
+ IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
+ IF_ASSIGN(var, ent, struct special_entry, 0); \
+ IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
+ TRACE_MMIO_RW); \
+ IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
+ TRACE_MMIO_MAP); \
+ IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
+ IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
+ IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
+ IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
+ TRACE_GRAPH_ENT); \
+ IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
+ TRACE_GRAPH_RET); \
+ IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
+ IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
+ __ftrace_bad_type(); \
+ } while (0)
+
+/* Return values for print_line callback */
+enum print_line_t {
+ TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
+ TRACE_TYPE_HANDLED = 1,
+ TRACE_TYPE_UNHANDLED = 2 /* Relay to other output functions */
+};
+
+
+/*
+ * An option specific to a tracer. This is a boolean value.
+ * The bit is the bit index that sets its value on the
+ * flags value in struct tracer_flags.
+ */
+struct tracer_opt {
+ const char *name; /* Will appear on the trace_options file */
+ u32 bit; /* Mask assigned in val field in tracer_flags */
+};
+
+/*
+ * The set of specific options for a tracer. Your tracer
+ * have to set the initial value of the flags val.
+ */
+struct tracer_flags {
+ u32 val;
+ struct tracer_opt *opts;
+};
+
+/* Makes more easy to define a tracer opt */
+#define TRACER_OPT(s, b) .name = #s, .bit = b
+
/*
* A specific tracer, represented by methods that operate on a trace array:
*/
struct tracer {
const char *name;
- void (*init)(struct trace_array *tr);
+ /* Your tracer should raise a warning if init fails */
+ int (*init)(struct trace_array *tr);
void (*reset)(struct trace_array *tr);
+ void (*start)(struct trace_array *tr);
+ void (*stop)(struct trace_array *tr);
void (*open)(struct trace_iterator *iter);
void (*pipe_open)(struct trace_iterator *iter);
void (*close)(struct trace_iterator *iter);
- void (*start)(struct trace_iterator *iter);
- void (*stop)(struct trace_iterator *iter);
ssize_t (*read)(struct trace_iterator *iter,
struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos);
- void (*ctrl_update)(struct trace_array *tr);
#ifdef CONFIG_FTRACE_STARTUP_TEST
int (*selftest)(struct tracer *trace,
struct trace_array *tr);
#endif
- int (*print_line)(struct trace_iterator *iter);
+ void (*print_header)(struct seq_file *m);
+ enum print_line_t (*print_line)(struct trace_iterator *iter);
+ /* If you handled the flag setting, return 0 */
+ int (*set_flag)(u32 old_flags, u32 bit, int set);
struct tracer *next;
int print_max;
+ struct tracer_flags *flags;
};
struct trace_seq {
@@ -171,60 +356,72 @@ struct trace_iterator {
struct trace_array *tr;
struct tracer *trace;
void *private;
- long last_overrun[NR_CPUS];
- long overrun[NR_CPUS];
+ struct ring_buffer_iter *buffer_iter[NR_CPUS];
/* The below is zeroed out in pipe_read */
struct trace_seq seq;
struct trace_entry *ent;
int cpu;
-
- struct trace_entry *prev_ent;
- int prev_cpu;
+ u64 ts;
unsigned long iter_flags;
loff_t pos;
- unsigned long next_idx[NR_CPUS];
- struct list_head *next_page[NR_CPUS];
- unsigned next_page_idx[NR_CPUS];
long idx;
+
+ cpumask_t started;
};
-void tracing_reset(struct trace_array_cpu *data);
+int tracing_is_enabled(void);
+void trace_wake_up(void);
+void tracing_reset(struct trace_array *tr, int cpu);
+void tracing_reset_online_cpus(struct trace_array *tr);
int tracing_open_generic(struct inode *inode, struct file *filp);
struct dentry *tracing_init_dentry(void);
void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
+struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
+ struct trace_array_cpu *data);
+void tracing_generic_entry_update(struct trace_entry *entry,
+ unsigned long flags,
+ int pc);
+
void ftrace(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long ip,
unsigned long parent_ip,
- unsigned long flags);
+ unsigned long flags, int pc);
void tracing_sched_switch_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *prev,
struct task_struct *next,
- unsigned long flags);
+ unsigned long flags, int pc);
void tracing_record_cmdline(struct task_struct *tsk);
void tracing_sched_wakeup_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *wakee,
struct task_struct *cur,
- unsigned long flags);
+ unsigned long flags, int pc);
void trace_special(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long arg1,
unsigned long arg2,
- unsigned long arg3);
+ unsigned long arg3, int pc);
void trace_function(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long ip,
unsigned long parent_ip,
- unsigned long flags);
+ unsigned long flags, int pc);
+
+void trace_graph_return(struct ftrace_graph_ret *trace);
+int trace_graph_entry(struct ftrace_graph_ent *trace);
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
void tracing_start_cmdline_record(void);
void tracing_stop_cmdline_record(void);
+void tracing_sched_switch_assign_trace(struct trace_array *tr);
+void tracing_stop_sched_switch_record(void);
+void tracing_start_sched_switch_record(void);
int register_tracer(struct tracer *type);
void unregister_tracer(struct tracer *type);
@@ -239,7 +436,7 @@ void update_max_tr_single(struct trace_array *tr,
extern cycle_t ftrace_now(int cpu);
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
void tracing_start_function_trace(void);
void tracing_stop_function_trace(void);
#else
@@ -260,6 +457,7 @@ struct tracer_switch_ops {
struct tracer_switch_ops *next;
};
+char *trace_find_cmdline(int pid);
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -268,54 +466,96 @@ extern unsigned long ftrace_update_tot_cnt;
extern int DYN_FTRACE_TEST_NAME(void);
#endif
-#ifdef CONFIG_MMIOTRACE
-extern void __trace_mmiotrace_rw(struct trace_array *tr,
- struct trace_array_cpu *data,
- struct mmiotrace_rw *rw);
-extern void __trace_mmiotrace_map(struct trace_array *tr,
- struct trace_array_cpu *data,
- struct mmiotrace_map *map);
-#endif
-
#ifdef CONFIG_FTRACE_STARTUP_TEST
-#ifdef CONFIG_FTRACE
extern int trace_selftest_startup_function(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_IRQSOFF_TRACER
extern int trace_selftest_startup_irqsoff(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_PREEMPT_TRACER
extern int trace_selftest_startup_preemptoff(struct tracer *trace,
struct trace_array *tr);
-#endif
-#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_SCHED_TRACER
extern int trace_selftest_startup_wakeup(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_CONTEXT_SWITCH_TRACER
+extern int trace_selftest_startup_nop(struct tracer *trace,
+ struct trace_array *tr);
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_SYSPROF_TRACER
extern int trace_selftest_startup_sysprof(struct tracer *trace,
struct trace_array *tr);
-#endif
+extern int trace_selftest_startup_branch(struct tracer *trace,
+ struct trace_array *tr);
#endif /* CONFIG_FTRACE_STARTUP_TEST */
extern void *head_page(struct trace_array_cpu *data);
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
+extern void trace_seq_print_cont(struct trace_seq *s,
+ struct trace_iterator *iter);
+
+extern int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
+ unsigned long sym_flags);
extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
size_t cnt);
extern long ns2usecs(cycle_t nsec);
+extern int
+trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args);
extern unsigned long trace_flags;
+/* Standard output formatting function used for function return traces */
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+extern enum print_line_t print_graph_function(struct trace_iterator *iter);
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+/* TODO: make this variable */
+#define FTRACE_GRAPH_MAX_FUNCS 32
+extern int ftrace_graph_count;
+extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
+
+static inline int ftrace_graph_addr(unsigned long addr)
+{
+ int i;
+
+ if (!ftrace_graph_count || test_tsk_trace_graph(current))
+ return 1;
+
+ for (i = 0; i < ftrace_graph_count; i++) {
+ if (addr == ftrace_graph_funcs[i])
+ return 1;
+ }
+
+ return 0;
+}
+#else
+static inline int ftrace_trace_addr(unsigned long addr)
+{
+ return 1;
+}
+static inline int ftrace_graph_addr(unsigned long addr)
+{
+ return 1;
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
+#else /* CONFIG_FUNCTION_GRAPH_TRACER */
+static inline enum print_line_t
+print_graph_function(struct trace_iterator *iter)
+{
+ return TRACE_TYPE_UNHANDLED;
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+extern struct pid *ftrace_pid_trace;
+
+static inline int ftrace_trace_task(struct task_struct *task)
+{
+ if (!ftrace_pid_trace)
+ return 1;
+
+ return test_tsk_trace_trace(task);
+}
+
/*
* trace_iterator_flags is an enumeration that defines bit
* positions into trace_flags that controls the output.
@@ -334,6 +574,94 @@ enum trace_iterator_flags {
TRACE_ITER_BLOCK = 0x80,
TRACE_ITER_STACKTRACE = 0x100,
TRACE_ITER_SCHED_TREE = 0x200,
+ TRACE_ITER_PRINTK = 0x400,
+ TRACE_ITER_PREEMPTONLY = 0x800,
+ TRACE_ITER_BRANCH = 0x1000,
+ TRACE_ITER_ANNOTATE = 0x2000,
+ TRACE_ITER_USERSTACKTRACE = 0x4000,
+ TRACE_ITER_SYM_USEROBJ = 0x8000,
+ TRACE_ITER_PRINTK_MSGONLY = 0x10000
};
+/*
+ * TRACE_ITER_SYM_MASK masks the options in trace_flags that
+ * control the output of kernel symbols.
+ */
+#define TRACE_ITER_SYM_MASK \
+ (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
+
+extern struct tracer nop_trace;
+
+/**
+ * ftrace_preempt_disable - disable preemption scheduler safe
+ *
+ * When tracing can happen inside the scheduler, there exists
+ * cases that the tracing might happen before the need_resched
+ * flag is checked. If this happens and the tracer calls
+ * preempt_enable (after a disable), a schedule might take place
+ * causing an infinite recursion.
+ *
+ * To prevent this, we read the need_recshed flag before
+ * disabling preemption. When we want to enable preemption we
+ * check the flag, if it is set, then we call preempt_enable_no_resched.
+ * Otherwise, we call preempt_enable.
+ *
+ * The rational for doing the above is that if need resched is set
+ * and we have yet to reschedule, we are either in an atomic location
+ * (where we do not need to check for scheduling) or we are inside
+ * the scheduler and do not want to resched.
+ */
+static inline int ftrace_preempt_disable(void)
+{
+ int resched;
+
+ resched = need_resched();
+ preempt_disable_notrace();
+
+ return resched;
+}
+
+/**
+ * ftrace_preempt_enable - enable preemption scheduler safe
+ * @resched: the return value from ftrace_preempt_disable
+ *
+ * This is a scheduler safe way to enable preemption and not miss
+ * any preemption checks. The disabled saved the state of preemption.
+ * If resched is set, then we were either inside an atomic or
+ * are inside the scheduler (we would have already scheduled
+ * otherwise). In this case, we do not want to call normal
+ * preempt_enable, but preempt_enable_no_resched instead.
+ */
+static inline void ftrace_preempt_enable(int resched)
+{
+ if (resched)
+ preempt_enable_no_resched_notrace();
+ else
+ preempt_enable_notrace();
+}
+
+#ifdef CONFIG_BRANCH_TRACER
+extern int enable_branch_tracing(struct trace_array *tr);
+extern void disable_branch_tracing(void);
+static inline int trace_branch_enable(struct trace_array *tr)
+{
+ if (trace_flags & TRACE_ITER_BRANCH)
+ return enable_branch_tracing(tr);
+ return 0;
+}
+static inline void trace_branch_disable(void)
+{
+ /* due to races, always disable */
+ disable_branch_tracing();
+}
+#else
+static inline int trace_branch_enable(struct trace_array *tr)
+{
+ return 0;
+}
+static inline void trace_branch_disable(void)
+{
+}
+#endif /* CONFIG_BRANCH_TRACER */
+
#endif /* _LINUX_KERNEL_TRACE_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-23 06:02:01 +0000