diff options
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 90 |
1 files changed, 50 insertions, 40 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 404a686a3644..662697babd48 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -33,8 +33,7 @@ * features, then it must call an indirect function that * does. Or at least does enough to prevent any unwelcomed side effects. */ -#if !defined(CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST) || \ - !ARCH_SUPPORTS_FTRACE_OPS +#if !ARCH_SUPPORTS_FTRACE_OPS # define FTRACE_FORCE_LIST_FUNC 1 #else # define FTRACE_FORCE_LIST_FUNC 0 @@ -57,6 +56,8 @@ struct ftrace_ops; typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct pt_regs *regs); +ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); + /* * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are * set in the flags member. @@ -90,6 +91,9 @@ typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, * INITIALIZED - The ftrace_ops has already been initialized (first use time * register_ftrace_function() is called, it will initialized the ops) * DELETED - The ops are being deleted, do not let them be registered again. + * ADDING - The ops is in the process of being added. + * REMOVING - The ops is in the process of being removed. + * MODIFYING - The ops is in the process of changing its filter functions. */ enum { FTRACE_OPS_FL_ENABLED = 1 << 0, @@ -101,8 +105,20 @@ enum { FTRACE_OPS_FL_STUB = 1 << 6, FTRACE_OPS_FL_INITIALIZED = 1 << 7, FTRACE_OPS_FL_DELETED = 1 << 8, + FTRACE_OPS_FL_ADDING = 1 << 9, + FTRACE_OPS_FL_REMOVING = 1 << 10, + FTRACE_OPS_FL_MODIFYING = 1 << 11, }; +#ifdef CONFIG_DYNAMIC_FTRACE +/* The hash used to know what functions callbacks trace */ +struct ftrace_ops_hash { + struct ftrace_hash *notrace_hash; + struct ftrace_hash *filter_hash; + struct mutex regex_lock; +}; +#endif + /* * Note, ftrace_ops can be referenced outside of RCU protection. * (Although, for perf, the control ops prevent that). If ftrace_ops is @@ -118,17 +134,17 @@ struct ftrace_ops { ftrace_func_t func; struct ftrace_ops *next; unsigned long flags; - int __percpu *disabled; void *private; + int __percpu *disabled; #ifdef CONFIG_DYNAMIC_FTRACE - struct ftrace_hash *notrace_hash; - struct ftrace_hash *filter_hash; - struct mutex regex_lock; + int nr_trampolines; + struct ftrace_ops_hash local_hash; + struct ftrace_ops_hash *func_hash; + struct ftrace_ops_hash old_hash; + unsigned long trampoline; #endif }; -extern int function_trace_stop; - /* * Type of the current tracing. */ @@ -140,32 +156,6 @@ enum ftrace_tracing_type_t { /* Current tracing type, default is FTRACE_TYPE_ENTER */ extern enum ftrace_tracing_type_t ftrace_tracing_type; -/** - * ftrace_stop - stop function tracer. - * - * A quick way to stop the function tracer. Note this an on off switch, - * it is not something that is recursive like preempt_disable. - * This does not disable the calling of mcount, it only stops the - * calling of functions from mcount. - */ -static inline void ftrace_stop(void) -{ - function_trace_stop = 1; -} - -/** - * ftrace_start - start the function tracer. - * - * This function is the inverse of ftrace_stop. This does not enable - * the function tracing if the function tracer is disabled. This only - * sets the function tracer flag to continue calling the functions - * from mcount. - */ -static inline void ftrace_start(void) -{ - function_trace_stop = 0; -} - /* * The ftrace_ops must be a static and should also * be read_mostly. These functions do modify read_mostly variables @@ -242,8 +232,6 @@ static inline int ftrace_nr_registered_ops(void) } static inline void clear_ftrace_function(void) { } static inline void ftrace_kill(void) { } -static inline void ftrace_stop(void) { } -static inline void ftrace_start(void) { } #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_STACK_TRACER @@ -317,13 +305,20 @@ extern int ftrace_nr_registered_ops(void); * from tracing that function. */ enum { - FTRACE_FL_ENABLED = (1UL << 29), + FTRACE_FL_ENABLED = (1UL << 31), FTRACE_FL_REGS = (1UL << 30), - FTRACE_FL_REGS_EN = (1UL << 31) + FTRACE_FL_REGS_EN = (1UL << 29), + FTRACE_FL_TRAMP = (1UL << 28), + FTRACE_FL_TRAMP_EN = (1UL << 27), }; -#define FTRACE_FL_MASK (0x7UL << 29) -#define FTRACE_REF_MAX ((1UL << 29) - 1) +#define FTRACE_REF_MAX_SHIFT 27 +#define FTRACE_FL_BITS 5 +#define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1) +#define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT) +#define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1) + +#define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK) struct dyn_ftrace { unsigned long ip; /* address of mcount call-site */ @@ -431,6 +426,10 @@ void ftrace_modify_all_code(int command); #define FTRACE_ADDR ((unsigned long)ftrace_caller) #endif +#ifndef FTRACE_GRAPH_ADDR +#define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller) +#endif + #ifndef FTRACE_REGS_ADDR #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) @@ -439,6 +438,16 @@ void ftrace_modify_all_code(int command); #endif #endif +/* + * If an arch would like functions that are only traced + * by the function graph tracer to jump directly to its own + * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR + * to be that address to jump to. + */ +#ifndef FTRACE_GRAPH_TRAMP_ADDR +#define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0) +#endif + #ifdef CONFIG_FUNCTION_GRAPH_TRACER extern void ftrace_graph_caller(void); extern int ftrace_enable_ftrace_graph_caller(void); @@ -736,6 +745,7 @@ extern char __irqentry_text_end[]; extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, trace_func_graph_ent_t entryfunc); +extern bool ftrace_graph_is_dead(void); extern void ftrace_graph_stop(void); /* The current handlers in use */ |