1 #ifndef _KERNEL_EVENTS_INTERNAL_H 2 #define _KERNEL_EVENTS_INTERNAL_H 3 4 #include <linux/hardirq.h> 5 #include <linux/uaccess.h> 6 7 /* Buffer handling */ 8 9 #define RING_BUFFER_WRITABLE 0x01 10 11 struct ring_buffer { 12 atomic_t refcount; 13 struct rcu_head rcu_head; 14 #ifdef CONFIG_PERF_USE_VMALLOC 15 struct work_struct work; 16 int page_order; /* allocation order */ 17 #endif 18 int nr_pages; /* nr of data pages */ 19 int overwrite; /* can overwrite itself */ 20 21 atomic_t poll; /* POLL_ for wakeups */ 22 23 local_t head; /* write position */ 24 local_t nest; /* nested writers */ 25 local_t events; /* event limit */ 26 local_t wakeup; /* wakeup stamp */ 27 local_t lost; /* nr records lost */ 28 29 long watermark; /* wakeup watermark */ 30 long aux_watermark; 31 /* poll crap */ 32 spinlock_t event_lock; 33 struct list_head event_list; 34 35 atomic_t mmap_count; 36 unsigned long mmap_locked; 37 struct user_struct *mmap_user; 38 39 /* AUX area */ 40 local_t aux_head; 41 local_t aux_nest; 42 local_t aux_wakeup; 43 unsigned long aux_pgoff; 44 int aux_nr_pages; 45 int aux_overwrite; 46 atomic_t aux_mmap_count; 47 unsigned long aux_mmap_locked; 48 void (*free_aux)(void *); 49 atomic_t aux_refcount; 50 void **aux_pages; 51 void *aux_priv; 52 53 struct perf_event_mmap_page *user_page; 54 void *data_pages[0]; 55 }; 56 57 extern void rb_free(struct ring_buffer *rb); 58 extern struct ring_buffer * 59 rb_alloc(int nr_pages, long watermark, int cpu, int flags); 60 extern void perf_event_wakeup(struct perf_event *event); 61 extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, 62 pgoff_t pgoff, int nr_pages, long watermark, int flags); 63 extern void rb_free_aux(struct ring_buffer *rb); 64 extern struct ring_buffer *ring_buffer_get(struct perf_event *event); 65 extern void ring_buffer_put(struct ring_buffer *rb); 66 67 static inline bool rb_has_aux(struct ring_buffer *rb) 68 { 69 return !!rb->aux_nr_pages; 70 } 71 72 void perf_event_aux_event(struct perf_event *event, unsigned long head, 73 unsigned long size, u64 flags); 74 75 extern struct page * 76 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); 77 78 #ifdef CONFIG_PERF_USE_VMALLOC 79 /* 80 * Back perf_mmap() with vmalloc memory. 81 * 82 * Required for architectures that have d-cache aliasing issues. 83 */ 84 85 static inline int page_order(struct ring_buffer *rb) 86 { 87 return rb->page_order; 88 } 89 90 #else 91 92 static inline int page_order(struct ring_buffer *rb) 93 { 94 return 0; 95 } 96 #endif 97 98 static inline unsigned long perf_data_size(struct ring_buffer *rb) 99 { 100 return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); 101 } 102 103 static inline unsigned long perf_aux_size(struct ring_buffer *rb) 104 { 105 return rb->aux_nr_pages << PAGE_SHIFT; 106 } 107 108 #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ 109 static inline unsigned long \ 110 func_name(struct perf_output_handle *handle, \ 111 const void *buf, unsigned long len) \ 112 { \ 113 unsigned long size, written; \ 114 \ 115 do { \ 116 size = min(handle->size, len); \ 117 written = memcpy_func(handle->addr, buf, size); \ 118 written = size - written; \ 119 \ 120 len -= written; \ 121 handle->addr += written; \ 122 buf += written; \ 123 handle->size -= written; \ 124 if (!handle->size) { \ 125 struct ring_buffer *rb = handle->rb; \ 126 \ 127 handle->page++; \ 128 handle->page &= rb->nr_pages - 1; \ 129 handle->addr = rb->data_pages[handle->page]; \ 130 handle->size = PAGE_SIZE << page_order(rb); \ 131 } \ 132 } while (len && written == size); \ 133 \ 134 return len; \ 135 } 136 137 static inline unsigned long 138 memcpy_common(void *dst, const void *src, unsigned long n) 139 { 140 memcpy(dst, src, n); 141 return 0; 142 } 143 144 DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) 145 146 static inline unsigned long 147 memcpy_skip(void *dst, const void *src, unsigned long n) 148 { 149 return 0; 150 } 151 152 DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) 153 154 #ifndef arch_perf_out_copy_user 155 #define arch_perf_out_copy_user arch_perf_out_copy_user 156 157 static inline unsigned long 158 arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) 159 { 160 unsigned long ret; 161 162 pagefault_disable(); 163 ret = __copy_from_user_inatomic(dst, src, n); 164 pagefault_enable(); 165 166 return ret; 167 } 168 #endif 169 170 DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) 171 172 /* Callchain handling */ 173 extern struct perf_callchain_entry * 174 perf_callchain(struct perf_event *event, struct pt_regs *regs); 175 extern int get_callchain_buffers(void); 176 extern void put_callchain_buffers(void); 177 178 static inline int get_recursion_context(int *recursion) 179 { 180 int rctx; 181 182 if (in_nmi()) 183 rctx = 3; 184 else if (in_irq()) 185 rctx = 2; 186 else if (in_softirq()) 187 rctx = 1; 188 else 189 rctx = 0; 190 191 if (recursion[rctx]) 192 return -1; 193 194 recursion[rctx]++; 195 barrier(); 196 197 return rctx; 198 } 199 200 static inline void put_recursion_context(int *recursion, int rctx) 201 { 202 barrier(); 203 recursion[rctx]--; 204 } 205 206 #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP 207 static inline bool arch_perf_have_user_stack_dump(void) 208 { 209 return true; 210 } 211 212 #define perf_user_stack_pointer(regs) user_stack_pointer(regs) 213 #else 214 static inline bool arch_perf_have_user_stack_dump(void) 215 { 216 return false; 217 } 218 219 #define perf_user_stack_pointer(regs) 0 220 #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ 221 222 #endif /* _KERNEL_EVENTS_INTERNAL_H */ 223