d6c1c49de5
Merge reason: Add these cherry-picked commits so that future changes
on perf/core don't conflict.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
#ifndef _KERNEL_EVENTS_INTERNAL_H
|
|
#define _KERNEL_EVENTS_INTERNAL_H
|
|
|
|
#include <linux/hardirq.h>
|
|
|
|
/* Buffer handling */
|
|
|
|
#define RING_BUFFER_WRITABLE 0x01
|
|
|
|
struct ring_buffer {
|
|
atomic_t refcount;
|
|
struct rcu_head rcu_head;
|
|
#ifdef CONFIG_PERF_USE_VMALLOC
|
|
struct work_struct work;
|
|
int page_order; /* allocation order */
|
|
#endif
|
|
int nr_pages; /* nr of data pages */
|
|
int writable; /* are we writable */
|
|
|
|
atomic_t poll; /* POLL_ for wakeups */
|
|
|
|
local_t head; /* write position */
|
|
local_t nest; /* nested writers */
|
|
local_t events; /* event limit */
|
|
local_t wakeup; /* wakeup stamp */
|
|
local_t lost; /* nr records lost */
|
|
|
|
long watermark; /* wakeup watermark */
|
|
/* poll crap */
|
|
spinlock_t event_lock;
|
|
struct list_head event_list;
|
|
|
|
struct perf_event_mmap_page *user_page;
|
|
void *data_pages[0];
|
|
};
|
|
|
|
extern void rb_free(struct ring_buffer *rb);
|
|
extern struct ring_buffer *
|
|
rb_alloc(int nr_pages, long watermark, int cpu, int flags);
|
|
extern void perf_event_wakeup(struct perf_event *event);
|
|
|
|
extern void
|
|
perf_event_header__init_id(struct perf_event_header *header,
|
|
struct perf_sample_data *data,
|
|
struct perf_event *event);
|
|
extern void
|
|
perf_event__output_id_sample(struct perf_event *event,
|
|
struct perf_output_handle *handle,
|
|
struct perf_sample_data *sample);
|
|
|
|
extern struct page *
|
|
perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
|
|
|
|
#ifdef CONFIG_PERF_USE_VMALLOC
|
|
/*
|
|
* Back perf_mmap() with vmalloc memory.
|
|
*
|
|
* Required for architectures that have d-cache aliasing issues.
|
|
*/
|
|
|
|
static inline int page_order(struct ring_buffer *rb)
|
|
{
|
|
return rb->page_order;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int page_order(struct ring_buffer *rb)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static inline unsigned long perf_data_size(struct ring_buffer *rb)
|
|
{
|
|
return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
|
|
}
|
|
|
|
static inline void
|
|
__output_copy(struct perf_output_handle *handle,
|
|
const void *buf, unsigned int len)
|
|
{
|
|
do {
|
|
unsigned long size = min_t(unsigned long, handle->size, len);
|
|
|
|
memcpy(handle->addr, buf, size);
|
|
|
|
len -= size;
|
|
handle->addr += size;
|
|
buf += size;
|
|
handle->size -= size;
|
|
if (!handle->size) {
|
|
struct ring_buffer *rb = handle->rb;
|
|
|
|
handle->page++;
|
|
handle->page &= rb->nr_pages - 1;
|
|
handle->addr = rb->data_pages[handle->page];
|
|
handle->size = PAGE_SIZE << page_order(rb);
|
|
}
|
|
} while (len);
|
|
}
|
|
|
|
/* Callchain handling */
|
|
extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
|
|
extern int get_callchain_buffers(void);
|
|
extern void put_callchain_buffers(void);
|
|
|
|
static inline int get_recursion_context(int *recursion)
|
|
{
|
|
int rctx;
|
|
|
|
if (in_nmi())
|
|
rctx = 3;
|
|
else if (in_irq())
|
|
rctx = 2;
|
|
else if (in_softirq())
|
|
rctx = 1;
|
|
else
|
|
rctx = 0;
|
|
|
|
if (recursion[rctx])
|
|
return -1;
|
|
|
|
recursion[rctx]++;
|
|
barrier();
|
|
|
|
return rctx;
|
|
}
|
|
|
|
static inline void put_recursion_context(int *recursion, int rctx)
|
|
{
|
|
barrier();
|
|
recursion[rctx]--;
|
|
}
|
|
|
|
#endif /* _KERNEL_EVENTS_INTERNAL_H */
|