struct perf_callchain_entry {
__u64 nr;
- __u64 ip[PERF_MAX_STACK_DEPTH];
+ __u64 ip[0]; /* /proc/sys/kernel/perf_event_max_stack */
+};
+
+struct perf_callchain_entry_ctx {
+ struct perf_callchain_entry *entry;
+ u32 max_stack;
+ u32 nr;
+ short contexts;
+ bool contexts_maxed;
};
struct perf_raw_record {
*/
struct task_struct *target;
+ /*
+ * PMU would store hardware filter configuration
+ * here.
+ */
+ void *addr_filters;
+
+ /* Last sync'ed generation of filters */
+ unsigned long addr_filters_gen;
+
/*
* hw_perf_event::state flags; used to track the PERF_EF_* state.
*/
#define PERF_PMU_CAP_AUX_SW_DOUBLEBUF 0x08
#define PERF_PMU_CAP_EXCLUSIVE 0x10
#define PERF_PMU_CAP_ITRACE 0x20
+#define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x40
/**
* struct pmu - generic performance monitoring unit
int task_ctx_nr;
int hrtimer_interval_ms;
+ /* number of address filters this PMU can do */
+ unsigned int nr_addr_filters;
+
/*
* Fully disable/enable this PMU, can be used to protect from the PMI
* as well as for lazy/batch writing of the MSRs.
*/
void (*free_aux) (void *aux); /* optional */
+ /*
+ * Validate address range filters: make sure the HW supports the
+ * requested configuration and number of filters; return 0 if the
+ * supplied filters are valid, -errno otherwise.
+ *
+ * Runs in the context of the ioctl()ing process and is not serialized
+ * with the rest of the PMU callbacks.
+ */
+ int (*addr_filters_validate) (struct list_head *filters);
+ /* optional */
+
+ /*
+ * Synchronize address range filter configuration:
+ * translate hw-agnostic filters into hardware configuration in
+ * event::hw::addr_filters.
+ *
+ * Runs as a part of filter sync sequence that is done in ->start()
+ * callback by calling perf_event_addr_filters_sync().
+ *
+ * May (and should) traverse event::addr_filters::list, for which its
+ * caller provides necessary serialization.
+ */
+ void (*addr_filters_sync) (struct perf_event *event);
+ /* optional */
+
/*
* Filter events for PMU-specific reasons.
*/
int (*filter_match) (struct perf_event *event); /* optional */
};
+/**
+ * struct perf_addr_filter - address range filter definition
+ * @entry: event's filter list linkage
+ * @inode: object file's inode for file-based filters
+ * @offset: filter range offset
+ * @size: filter range size
+ * @range: 1: range, 0: address
+ * @filter: 1: filter/start, 0: stop
+ *
+ * This is a hardware-agnostic filter configuration as specified by the user.
+ */
+struct perf_addr_filter {
+ struct list_head entry;
+ struct inode *inode;
+ unsigned long offset;
+ unsigned long size;
+ unsigned int range : 1,
+ filter : 1;
+};
+
+/**
+ * struct perf_addr_filters_head - container for address range filters
+ * @list: list of filters for this event
+ * @lock: spinlock that serializes accesses to the @list and event's
+ * (and its children's) filter generations.
+ *
+ * A child event will use parent's @list (and therefore @lock), so they are
+ * bundled together; see perf_event_addr_filters().
+ */
+struct perf_addr_filters_head {
+ struct list_head list;
+ raw_spinlock_t lock;
+};
+
/**
* enum perf_event_active_state - the states of a event
*/
atomic_t event_limit;
+ /* address range filters */
+ struct perf_addr_filters_head addr_filters;
+ /* vma address array for file-based filders */
+ unsigned long *addr_filters_offs;
+ unsigned long addr_filters_gen;
+
void (*destroy)(struct perf_event *);
struct rcu_head rcu_head;
struct perf_sample_data *data,
struct pt_regs *regs);
+extern void perf_event_output_forward(struct perf_event *event,
+ struct perf_sample_data *data,
+ struct pt_regs *regs);
+extern void perf_event_output_backward(struct perf_event *event,
+ struct perf_sample_data *data,
+ struct pt_regs *regs);
extern void perf_event_output(struct perf_event *event,
- struct perf_sample_data *data,
- struct pt_regs *regs);
+ struct perf_sample_data *data,
+ struct pt_regs *regs);
+
+static inline bool
+is_default_overflow_handler(struct perf_event *event)
+{
+ if (likely(event->overflow_handler == perf_event_output_forward))
+ return true;
+ if (unlikely(event->overflow_handler == perf_event_output_backward))
+ return true;
+ return false;
+}
extern void
perf_event_header__init_id(struct perf_event_header *header,
/* Callchains */
DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
-extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
-extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
+extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
+extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
extern struct perf_callchain_entry *
get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
- bool crosstask, bool add_mark);
+ u32 max_stack, bool crosstask, bool add_mark);
extern int get_callchain_buffers(void);
extern void put_callchain_buffers(void);
-static inline int perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
+extern int sysctl_perf_event_max_stack;
+extern int sysctl_perf_event_max_contexts_per_stack;
+
+static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip)
+{
+ if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) {
+ struct perf_callchain_entry *entry = ctx->entry;
+ entry->ip[entry->nr++] = ip;
+ ++ctx->contexts;
+ return 0;
+ } else {
+ ctx->contexts_maxed = true;
+ return -1; /* no more room, stop walking the stack */
+ }
+}
+
+static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip)
{
- if (entry->nr < PERF_MAX_STACK_DEPTH) {
+ if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) {
+ struct perf_callchain_entry *entry = ctx->entry;
entry->ip[entry->nr++] = ip;
+ ++ctx->nr;
return 0;
} else {
return -1; /* no more room, stop walking the stack */
void __user *buffer, size_t *lenp,
loff_t *ppos);
+int perf_event_max_stack_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
static inline bool perf_paranoid_tracepoint_raw(void)
{
return event->pmu->setup_aux;
}
+static inline bool is_write_backward(struct perf_event *event)
+{
+ return !!event->attr.write_backward;
+}
+
+static inline bool has_addr_filter(struct perf_event *event)
+{
+ return event->pmu->nr_addr_filters;
+}
+
+/*
+ * An inherited event uses parent's filters
+ */
+static inline struct perf_addr_filters_head *
+perf_event_addr_filters(struct perf_event *event)
+{
+ struct perf_addr_filters_head *ifh = &event->addr_filters;
+
+ if (event->parent)
+ ifh = &event->parent->addr_filters;
+
+ return ifh;
+}
+
+extern void perf_event_addr_filters_sync(struct perf_event *event);
+
extern int perf_output_begin(struct perf_output_handle *handle,
struct perf_event *event, unsigned int size);
+extern int perf_output_begin_forward(struct perf_output_handle *handle,
+ struct perf_event *event,
+ unsigned int size);
+extern int perf_output_begin_backward(struct perf_output_handle *handle,
+ struct perf_event *event,
+ unsigned int size);
+
extern void perf_output_end(struct perf_output_handle *handle);
extern unsigned int perf_output_copy(struct perf_output_handle *handle,
const void *buf, unsigned int len);
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