1 #ifndef _KERNEL_EVENTS_INTERNAL_H 2 #define _KERNEL_EVENTS_INTERNAL_H 3 4 #define RING_BUFFER_WRITABLE 0x01 5 6 struct ring_buffer { 7 atomic_t refcount; 8 struct rcu_head rcu_head; 9 #ifdef CONFIG_PERF_USE_VMALLOC 10 struct work_struct work; 11 int page_order; /* allocation order */ 12 #endif 13 int nr_pages; /* nr of data pages */ 14 int writable; /* are we writable */ 15 16 atomic_t poll; /* POLL_ for wakeups */ 17 18 local_t head; /* write position */ 19 local_t nest; /* nested writers */ 20 local_t events; /* event limit */ 21 local_t wakeup; /* wakeup stamp */ 22 local_t lost; /* nr records lost */ 23 24 long watermark; /* wakeup watermark */ 25 /* poll crap */ 26 spinlock_t event_lock; 27 struct list_head event_list; 28 29 struct perf_event_mmap_page *user_page; 30 void *data_pages[0]; 31 }; 32 33 extern void rb_free(struct ring_buffer *rb); 34 extern struct ring_buffer * 35 rb_alloc(int nr_pages, long watermark, int cpu, int flags); 36 extern void perf_event_wakeup(struct perf_event *event); 37 38 extern void 39 perf_event_header__init_id(struct perf_event_header *header, 40 struct perf_sample_data *data, 41 struct perf_event *event); 42 extern void 43 perf_event__output_id_sample(struct perf_event *event, 44 struct perf_output_handle *handle, 45 struct perf_sample_data *sample); 46 47 extern struct page * 48 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); 49 50 #ifdef CONFIG_PERF_USE_VMALLOC 51 /* 52 * Back perf_mmap() with vmalloc memory. 53 * 54 * Required for architectures that have d-cache aliasing issues. 55 */ 56 57 static inline int page_order(struct ring_buffer *rb) 58 { 59 return rb->page_order; 60 } 61 62 #else 63 64 static inline int page_order(struct ring_buffer *rb) 65 { 66 return 0; 67 } 68 #endif 69 70 static unsigned long perf_data_size(struct ring_buffer *rb) 71 { 72 return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); 73 } 74 75 static inline void 76 __output_copy(struct perf_output_handle *handle, 77 const void *buf, unsigned int len) 78 { 79 do { 80 unsigned long size = min_t(unsigned long, handle->size, len); 81 82 memcpy(handle->addr, buf, size); 83 84 len -= size; 85 handle->addr += size; 86 buf += size; 87 handle->size -= size; 88 if (!handle->size) { 89 struct ring_buffer *rb = handle->rb; 90 91 handle->page++; 92 handle->page &= rb->nr_pages - 1; 93 handle->addr = rb->data_pages[handle->page]; 94 handle->size = PAGE_SIZE << page_order(rb); 95 } 96 } while (len); 97 } 98 99 #endif /* _KERNEL_EVENTS_INTERNAL_H */ 100