176369139SFrederic Weisbecker #ifndef _KERNEL_EVENTS_INTERNAL_H 276369139SFrederic Weisbecker #define _KERNEL_EVENTS_INTERNAL_H 376369139SFrederic Weisbecker 49251f904SBorislav Petkov #include <linux/hardirq.h> 591d7753aSFrederic Weisbecker #include <linux/uaccess.h> 69251f904SBorislav Petkov 79251f904SBorislav Petkov /* Buffer handling */ 89251f904SBorislav Petkov 976369139SFrederic Weisbecker #define RING_BUFFER_WRITABLE 0x01 1076369139SFrederic Weisbecker 1176369139SFrederic Weisbecker struct ring_buffer { 1276369139SFrederic Weisbecker atomic_t refcount; 1376369139SFrederic Weisbecker struct rcu_head rcu_head; 1476369139SFrederic Weisbecker #ifdef CONFIG_PERF_USE_VMALLOC 1576369139SFrederic Weisbecker struct work_struct work; 1676369139SFrederic Weisbecker int page_order; /* allocation order */ 1776369139SFrederic Weisbecker #endif 1876369139SFrederic Weisbecker int nr_pages; /* nr of data pages */ 19dd9c086dSStephane Eranian int overwrite; /* can overwrite itself */ 2076369139SFrederic Weisbecker 2176369139SFrederic Weisbecker atomic_t poll; /* POLL_ for wakeups */ 2276369139SFrederic Weisbecker 2376369139SFrederic Weisbecker local_t head; /* write position */ 2476369139SFrederic Weisbecker local_t nest; /* nested writers */ 2576369139SFrederic Weisbecker local_t events; /* event limit */ 2676369139SFrederic Weisbecker local_t wakeup; /* wakeup stamp */ 2776369139SFrederic Weisbecker local_t lost; /* nr records lost */ 2876369139SFrederic Weisbecker 2976369139SFrederic Weisbecker long watermark; /* wakeup watermark */ 3010c6db11SPeter Zijlstra /* poll crap */ 3110c6db11SPeter Zijlstra spinlock_t event_lock; 3210c6db11SPeter Zijlstra struct list_head event_list; 3376369139SFrederic Weisbecker 349bb5d40cSPeter Zijlstra atomic_t mmap_count; 359bb5d40cSPeter Zijlstra unsigned long mmap_locked; 3626cb63adSPeter Zijlstra struct user_struct *mmap_user; 3726cb63adSPeter Zijlstra 3876369139SFrederic Weisbecker struct perf_event_mmap_page *user_page; 3976369139SFrederic Weisbecker void *data_pages[0]; 4076369139SFrederic Weisbecker }; 4176369139SFrederic Weisbecker 4276369139SFrederic Weisbecker extern void rb_free(struct ring_buffer *rb); 4376369139SFrederic Weisbecker extern struct ring_buffer * 4476369139SFrederic Weisbecker rb_alloc(int nr_pages, long watermark, int cpu, int flags); 4576369139SFrederic Weisbecker extern void perf_event_wakeup(struct perf_event *event); 4676369139SFrederic Weisbecker 4776369139SFrederic Weisbecker extern void 4876369139SFrederic Weisbecker perf_event_header__init_id(struct perf_event_header *header, 4976369139SFrederic Weisbecker struct perf_sample_data *data, 5076369139SFrederic Weisbecker struct perf_event *event); 5176369139SFrederic Weisbecker extern void 5276369139SFrederic Weisbecker perf_event__output_id_sample(struct perf_event *event, 5376369139SFrederic Weisbecker struct perf_output_handle *handle, 5476369139SFrederic Weisbecker struct perf_sample_data *sample); 5576369139SFrederic Weisbecker 5676369139SFrederic Weisbecker extern struct page * 5776369139SFrederic Weisbecker perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); 5876369139SFrederic Weisbecker 5976369139SFrederic Weisbecker #ifdef CONFIG_PERF_USE_VMALLOC 6076369139SFrederic Weisbecker /* 6176369139SFrederic Weisbecker * Back perf_mmap() with vmalloc memory. 6276369139SFrederic Weisbecker * 6376369139SFrederic Weisbecker * Required for architectures that have d-cache aliasing issues. 6476369139SFrederic Weisbecker */ 6576369139SFrederic Weisbecker 6676369139SFrederic Weisbecker static inline int page_order(struct ring_buffer *rb) 6776369139SFrederic Weisbecker { 6876369139SFrederic Weisbecker return rb->page_order; 6976369139SFrederic Weisbecker } 7076369139SFrederic Weisbecker 7176369139SFrederic Weisbecker #else 7276369139SFrederic Weisbecker 7376369139SFrederic Weisbecker static inline int page_order(struct ring_buffer *rb) 7476369139SFrederic Weisbecker { 7576369139SFrederic Weisbecker return 0; 7676369139SFrederic Weisbecker } 7776369139SFrederic Weisbecker #endif 7876369139SFrederic Weisbecker 799251f904SBorislav Petkov static inline unsigned long perf_data_size(struct ring_buffer *rb) 8076369139SFrederic Weisbecker { 8176369139SFrederic Weisbecker return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); 8276369139SFrederic Weisbecker } 8376369139SFrederic Weisbecker 8491d7753aSFrederic Weisbecker #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ 850a196848SPeter Zijlstra static inline unsigned long \ 8691d7753aSFrederic Weisbecker func_name(struct perf_output_handle *handle, \ 870a196848SPeter Zijlstra const void *buf, unsigned long len) \ 8891d7753aSFrederic Weisbecker { \ 8991d7753aSFrederic Weisbecker unsigned long size, written; \ 9091d7753aSFrederic Weisbecker \ 9191d7753aSFrederic Weisbecker do { \ 920a196848SPeter Zijlstra size = min(handle->size, len); \ 9391d7753aSFrederic Weisbecker written = memcpy_func(handle->addr, buf, size); \ 940a196848SPeter Zijlstra written = size - written; \ 9591d7753aSFrederic Weisbecker \ 9691d7753aSFrederic Weisbecker len -= written; \ 9791d7753aSFrederic Weisbecker handle->addr += written; \ 9891d7753aSFrederic Weisbecker buf += written; \ 9991d7753aSFrederic Weisbecker handle->size -= written; \ 10091d7753aSFrederic Weisbecker if (!handle->size) { \ 10191d7753aSFrederic Weisbecker struct ring_buffer *rb = handle->rb; \ 10291d7753aSFrederic Weisbecker \ 10391d7753aSFrederic Weisbecker handle->page++; \ 10491d7753aSFrederic Weisbecker handle->page &= rb->nr_pages - 1; \ 10591d7753aSFrederic Weisbecker handle->addr = rb->data_pages[handle->page]; \ 10691d7753aSFrederic Weisbecker handle->size = PAGE_SIZE << page_order(rb); \ 10791d7753aSFrederic Weisbecker } \ 10891d7753aSFrederic Weisbecker } while (len && written == size); \ 10991d7753aSFrederic Weisbecker \ 11091d7753aSFrederic Weisbecker return len; \ 11191d7753aSFrederic Weisbecker } 11291d7753aSFrederic Weisbecker 1130a196848SPeter Zijlstra static inline unsigned long 1140a196848SPeter Zijlstra memcpy_common(void *dst, const void *src, unsigned long n) 11576369139SFrederic Weisbecker { 11691d7753aSFrederic Weisbecker memcpy(dst, src, n); 1170a196848SPeter Zijlstra return 0; 11876369139SFrederic Weisbecker } 11991d7753aSFrederic Weisbecker 12091d7753aSFrederic Weisbecker DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) 12191d7753aSFrederic Weisbecker 1220a196848SPeter Zijlstra static inline unsigned long 1230a196848SPeter Zijlstra memcpy_skip(void *dst, const void *src, unsigned long n) 1240a196848SPeter Zijlstra { 1250a196848SPeter Zijlstra return 0; 1260a196848SPeter Zijlstra } 1275685e0ffSJiri Olsa 1280a196848SPeter Zijlstra DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) 1295685e0ffSJiri Olsa 13091d7753aSFrederic Weisbecker #ifndef arch_perf_out_copy_user 1310a196848SPeter Zijlstra #define arch_perf_out_copy_user arch_perf_out_copy_user 1320a196848SPeter Zijlstra 1330a196848SPeter Zijlstra static inline unsigned long 1340a196848SPeter Zijlstra arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) 1350a196848SPeter Zijlstra { 1360a196848SPeter Zijlstra unsigned long ret; 1370a196848SPeter Zijlstra 1380a196848SPeter Zijlstra pagefault_disable(); 1390a196848SPeter Zijlstra ret = __copy_from_user_inatomic(dst, src, n); 1400a196848SPeter Zijlstra pagefault_enable(); 1410a196848SPeter Zijlstra 1420a196848SPeter Zijlstra return ret; 1430a196848SPeter Zijlstra } 14491d7753aSFrederic Weisbecker #endif 14591d7753aSFrederic Weisbecker 14691d7753aSFrederic Weisbecker DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) 14776369139SFrederic Weisbecker 1489251f904SBorislav Petkov /* Callchain handling */ 149e6dab5ffSAndrew Vagin extern struct perf_callchain_entry * 150e6dab5ffSAndrew Vagin perf_callchain(struct perf_event *event, struct pt_regs *regs); 1519251f904SBorislav Petkov extern int get_callchain_buffers(void); 1529251f904SBorislav Petkov extern void put_callchain_buffers(void); 1539251f904SBorislav Petkov 1549251f904SBorislav Petkov static inline int get_recursion_context(int *recursion) 1559251f904SBorislav Petkov { 1569251f904SBorislav Petkov int rctx; 1579251f904SBorislav Petkov 1589251f904SBorislav Petkov if (in_nmi()) 1599251f904SBorislav Petkov rctx = 3; 1609251f904SBorislav Petkov else if (in_irq()) 1619251f904SBorislav Petkov rctx = 2; 1629251f904SBorislav Petkov else if (in_softirq()) 1639251f904SBorislav Petkov rctx = 1; 1649251f904SBorislav Petkov else 1659251f904SBorislav Petkov rctx = 0; 1669251f904SBorislav Petkov 1679251f904SBorislav Petkov if (recursion[rctx]) 1689251f904SBorislav Petkov return -1; 1699251f904SBorislav Petkov 1709251f904SBorislav Petkov recursion[rctx]++; 1719251f904SBorislav Petkov barrier(); 1729251f904SBorislav Petkov 1739251f904SBorislav Petkov return rctx; 1749251f904SBorislav Petkov } 1759251f904SBorislav Petkov 1769251f904SBorislav Petkov static inline void put_recursion_context(int *recursion, int rctx) 1779251f904SBorislav Petkov { 1789251f904SBorislav Petkov barrier(); 1799251f904SBorislav Petkov recursion[rctx]--; 1809251f904SBorislav Petkov } 1819251f904SBorislav Petkov 182c5ebcedbSJiri Olsa #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP 183c5ebcedbSJiri Olsa static inline bool arch_perf_have_user_stack_dump(void) 184c5ebcedbSJiri Olsa { 185c5ebcedbSJiri Olsa return true; 186c5ebcedbSJiri Olsa } 187c5ebcedbSJiri Olsa 188c5ebcedbSJiri Olsa #define perf_user_stack_pointer(regs) user_stack_pointer(regs) 189c5ebcedbSJiri Olsa #else 190c5ebcedbSJiri Olsa static inline bool arch_perf_have_user_stack_dump(void) 191c5ebcedbSJiri Olsa { 192c5ebcedbSJiri Olsa return false; 193c5ebcedbSJiri Olsa } 194c5ebcedbSJiri Olsa 195c5ebcedbSJiri Olsa #define perf_user_stack_pointer(regs) 0 196c5ebcedbSJiri Olsa #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ 197c5ebcedbSJiri Olsa 19876369139SFrederic Weisbecker #endif /* _KERNEL_EVENTS_INTERNAL_H */ 199