diff options
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 215 |
1 files changed, 149 insertions, 66 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index f69f867..8465ad0 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -5,7 +5,9 @@ #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> enum trace_type { __TRACE_FIRST_TYPE = 0, @@ -13,38 +15,60 @@ enum trace_type { TRACE_FN, TRACE_CTX, TRACE_WAKE, + TRACE_CONT, TRACE_STACK, + TRACE_PRINT, TRACE_SPECIAL, TRACE_MMIO_RW, TRACE_MMIO_MAP, + TRACE_BOOT, __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; +}; + +/* * Function trace entry - function address and parent function addres: */ struct ftrace_entry { + struct trace_entry ent; unsigned long ip; unsigned long parent_ip; }; +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 +81,62 @@ struct special_entry { #define FTRACE_STACK_ENTRIES 8 struct stack_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; + 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]; +}; + +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 { + struct trace_entry ent; + struct boot_trace initcall; +}; + +/* + * 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_ENTRY_SIZE sizeof(struct trace_entry) +#define TRACE_BUF_SIZE 1024 /* * The CPU trace array - it consists of thousands of trace entries @@ -91,16 +144,9 @@ 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; @@ -124,6 +170,7 @@ struct trace_iterator; * They have on/off state as well: */ struct trace_array { + struct ring_buffer *buffer; unsigned long entries; long ctrl; int cpu; @@ -132,6 +179,56 @@ struct trace_array { 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 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, TRACE_BOOT); \ + __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 */ +}; + /* * A specific tracer, represented by methods that operate on a trace array: */ @@ -152,7 +249,7 @@ struct tracer { int (*selftest)(struct tracer *trace, struct trace_array *tr); #endif - int (*print_line)(struct trace_iterator *iter); + enum print_line_t (*print_line)(struct trace_iterator *iter); struct tracer *next; int print_max; }; @@ -171,57 +268,58 @@ 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; }; -void tracing_reset(struct trace_array_cpu *data); +void trace_wake_up(void); +void tracing_reset(struct trace_array *tr, int cpu); 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 tracing_start_cmdline_record(void); void tracing_stop_cmdline_record(void); @@ -239,7 +337,7 @@ 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 @@ -268,51 +366,33 @@ 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 #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 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, const char *fmt, va_list args); extern unsigned long trace_flags; @@ -334,6 +414,9 @@ enum trace_iterator_flags { TRACE_ITER_BLOCK = 0x80, TRACE_ITER_STACKTRACE = 0x100, TRACE_ITER_SCHED_TREE = 0x200, + TRACE_ITER_PRINTK = 0x400, }; +extern struct tracer nop_trace; + #endif /* _LINUX_KERNEL_TRACE_H */ |
