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 /* poll crap */
31 spinlock_t event_lock;
32 struct list_head event_list;
33
34 atomic_t mmap_count;
35 unsigned long mmap_locked;
36 struct user_struct *mmap_user;
37
38 struct perf_event_mmap_page *user_page;
39 void *data_pages[0];
40 };
41
42 extern void rb_free(struct ring_buffer *rb);
43 extern struct ring_buffer *
44 rb_alloc(int nr_pages, long watermark, int cpu, int flags);
45 extern void perf_event_wakeup(struct perf_event *event);
46
47 extern void
48 perf_event_header__init_id(struct perf_event_header *header,
49 struct perf_sample_data *data,
50 struct perf_event *event);
51 extern void
52 perf_event__output_id_sample(struct perf_event *event,
53 struct perf_output_handle *handle,
54 struct perf_sample_data *sample);
55
56 extern struct page *
57 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
58
59 #ifdef CONFIG_PERF_USE_VMALLOC
60 /*
61 * Back perf_mmap() with vmalloc memory.
62 *
63 * Required for architectures that have d-cache aliasing issues.
64 */
65
page_order(struct ring_buffer * rb)66 static inline int page_order(struct ring_buffer *rb)
67 {
68 return rb->page_order;
69 }
70
71 #else
72
page_order(struct ring_buffer * rb)73 static inline int page_order(struct ring_buffer *rb)
74 {
75 return 0;
76 }
77 #endif
78
perf_data_size(struct ring_buffer * rb)79 static inline unsigned long perf_data_size(struct ring_buffer *rb)
80 {
81 return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
82 }
83
84 #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \
85 static inline unsigned long \
86 func_name(struct perf_output_handle *handle, \
87 const void *buf, unsigned long len) \
88 { \
89 unsigned long size, written; \
90 \
91 do { \
92 size = min(handle->size, len); \
93 written = memcpy_func(handle->addr, buf, size); \
94 written = size - written; \
95 \
96 len -= written; \
97 handle->addr += written; \
98 buf += written; \
99 handle->size -= written; \
100 if (!handle->size) { \
101 struct ring_buffer *rb = handle->rb; \
102 \
103 handle->page++; \
104 handle->page &= rb->nr_pages - 1; \
105 handle->addr = rb->data_pages[handle->page]; \
106 handle->size = PAGE_SIZE << page_order(rb); \
107 } \
108 } while (len && written == size); \
109 \
110 return len; \
111 }
112
113 static inline unsigned long
memcpy_common(void * dst,const void * src,unsigned long n)114 memcpy_common(void *dst, const void *src, unsigned long n)
115 {
116 memcpy(dst, src, n);
117 return 0;
118 }
119
DEFINE_OUTPUT_COPY(__output_copy,memcpy_common)120 DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
121
122 static inline unsigned long
123 memcpy_skip(void *dst, const void *src, unsigned long n)
124 {
125 return 0;
126 }
127
DEFINE_OUTPUT_COPY(__output_skip,memcpy_skip)128 DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip)
129
130 #ifndef arch_perf_out_copy_user
131 #define arch_perf_out_copy_user arch_perf_out_copy_user
132
133 static inline unsigned long
134 arch_perf_out_copy_user(void *dst, const void *src, unsigned long n)
135 {
136 unsigned long ret;
137
138 pagefault_disable();
139 ret = __copy_from_user_inatomic(dst, src, n);
140 pagefault_enable();
141
142 return ret;
143 }
144 #endif
145
146 DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)
147
148 /* Callchain handling */
149 extern struct perf_callchain_entry *
150 perf_callchain(struct perf_event *event, struct pt_regs *regs);
151 extern int get_callchain_buffers(void);
152 extern void put_callchain_buffers(void);
153
get_recursion_context(int * recursion)154 static inline int get_recursion_context(int *recursion)
155 {
156 int rctx;
157
158 if (in_nmi())
159 rctx = 3;
160 else if (in_irq())
161 rctx = 2;
162 else if (in_softirq())
163 rctx = 1;
164 else
165 rctx = 0;
166
167 if (recursion[rctx])
168 return -1;
169
170 recursion[rctx]++;
171 barrier();
172
173 return rctx;
174 }
175
put_recursion_context(int * recursion,int rctx)176 static inline void put_recursion_context(int *recursion, int rctx)
177 {
178 barrier();
179 recursion[rctx]--;
180 }
181
182 #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP
arch_perf_have_user_stack_dump(void)183 static inline bool arch_perf_have_user_stack_dump(void)
184 {
185 return true;
186 }
187
188 #define perf_user_stack_pointer(regs) user_stack_pointer(regs)
189 #else
arch_perf_have_user_stack_dump(void)190 static inline bool arch_perf_have_user_stack_dump(void)
191 {
192 return false;
193 }
194
195 #define perf_user_stack_pointer(regs) 0
196 #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */
197
198 #endif /* _KERNEL_EVENTS_INTERNAL_H */
199