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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
11struct 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
42extern void rb_free(struct ring_buffer *rb);
43extern struct ring_buffer *
44rb_alloc(int nr_pages, long watermark, int cpu, int flags);
45extern void perf_event_wakeup(struct perf_event *event);
46
47extern void
48perf_event_header__init_id(struct perf_event_header *header,
49 struct perf_sample_data *data,
50 struct perf_event *event);
51extern void
52perf_event__output_id_sample(struct perf_event *event,
53 struct perf_output_handle *handle,
54 struct perf_sample_data *sample);
55
56extern struct page *
57perf_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
66static inline int page_order(struct ring_buffer *rb)
67{
68 return rb->page_order;
69}
70
71#else
72
73static inline int page_order(struct ring_buffer *rb)
74{
75 return 0;
76}
77#endif
78
79static 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) \
85static inline unsigned long \
86func_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
113static inline unsigned long
114memcpy_common(void *dst, const void *src, unsigned long n)
115{
116 memcpy(dst, src, n);
117 return 0;
118}
119
120DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
121
122static inline unsigned long
123memcpy_skip(void *dst, const void *src, unsigned long n)
124{
125 return 0;
126}
127
128DEFINE_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
133static inline unsigned long
134arch_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
146DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)
147
148/* Callchain handling */
149extern struct perf_callchain_entry *
150perf_callchain(struct perf_event *event, struct pt_regs *regs);
151extern int get_callchain_buffers(void);
152extern void put_callchain_buffers(void);
153
154static 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
176static 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
183static 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
190static 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 */
1#ifndef _KERNEL_EVENTS_INTERNAL_H
2#define _KERNEL_EVENTS_INTERNAL_H
3
4#define RING_BUFFER_WRITABLE 0x01
5
6struct 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
26 struct perf_event_mmap_page *user_page;
27 void *data_pages[0];
28};
29
30extern void rb_free(struct ring_buffer *rb);
31extern struct ring_buffer *
32rb_alloc(int nr_pages, long watermark, int cpu, int flags);
33extern void perf_event_wakeup(struct perf_event *event);
34
35extern void
36perf_event_header__init_id(struct perf_event_header *header,
37 struct perf_sample_data *data,
38 struct perf_event *event);
39extern void
40perf_event__output_id_sample(struct perf_event *event,
41 struct perf_output_handle *handle,
42 struct perf_sample_data *sample);
43
44extern struct page *
45perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
46
47#ifdef CONFIG_PERF_USE_VMALLOC
48/*
49 * Back perf_mmap() with vmalloc memory.
50 *
51 * Required for architectures that have d-cache aliasing issues.
52 */
53
54static inline int page_order(struct ring_buffer *rb)
55{
56 return rb->page_order;
57}
58
59#else
60
61static inline int page_order(struct ring_buffer *rb)
62{
63 return 0;
64}
65#endif
66
67static unsigned long perf_data_size(struct ring_buffer *rb)
68{
69 return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
70}
71
72static inline void
73__output_copy(struct perf_output_handle *handle,
74 const void *buf, unsigned int len)
75{
76 do {
77 unsigned long size = min_t(unsigned long, handle->size, len);
78
79 memcpy(handle->addr, buf, size);
80
81 len -= size;
82 handle->addr += size;
83 buf += size;
84 handle->size -= size;
85 if (!handle->size) {
86 struct ring_buffer *rb = handle->rb;
87
88 handle->page++;
89 handle->page &= rb->nr_pages - 1;
90 handle->addr = rb->data_pages[handle->page];
91 handle->size = PAGE_SIZE << page_order(rb);
92 }
93 } while (len);
94}
95
96#endif /* _KERNEL_EVENTS_INTERNAL_H */