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76369139 FW |
1 | #ifndef _KERNEL_EVENTS_INTERNAL_H |
2 | #define _KERNEL_EVENTS_INTERNAL_H | |
3 | ||
9251f904 | 4 | #include <linux/hardirq.h> |
91d7753a | 5 | #include <linux/uaccess.h> |
9251f904 BP |
6 | |
7 | /* Buffer handling */ | |
8 | ||
76369139 FW |
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 */ | |
dd9c086d | 19 | int overwrite; /* can overwrite itself */ |
76369139 FW |
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 */ | |
1a594131 | 30 | long aux_watermark; |
10c6db11 PZ |
31 | /* poll crap */ |
32 | spinlock_t event_lock; | |
33 | struct list_head event_list; | |
76369139 | 34 | |
9bb5d40c PZ |
35 | atomic_t mmap_count; |
36 | unsigned long mmap_locked; | |
26cb63ad PZ |
37 | struct user_struct *mmap_user; |
38 | ||
45bfb2e5 | 39 | /* AUX area */ |
fdc26706 AS |
40 | local_t aux_head; |
41 | local_t aux_nest; | |
1a594131 | 42 | local_t aux_wakeup; |
45bfb2e5 PZ |
43 | unsigned long aux_pgoff; |
44 | int aux_nr_pages; | |
2023a0d2 | 45 | int aux_overwrite; |
45bfb2e5 PZ |
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 | ||
76369139 FW |
53 | struct perf_event_mmap_page *user_page; |
54 | void *data_pages[0]; | |
55 | }; | |
56 | ||
76369139 FW |
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); | |
45bfb2e5 | 61 | extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, |
1a594131 | 62 | pgoff_t pgoff, int nr_pages, long watermark, int flags); |
45bfb2e5 | 63 | extern void rb_free_aux(struct ring_buffer *rb); |
fdc26706 AS |
64 | extern struct ring_buffer *ring_buffer_get(struct perf_event *event); |
65 | extern void ring_buffer_put(struct ring_buffer *rb); | |
45bfb2e5 PZ |
66 | |
67 | static inline bool rb_has_aux(struct ring_buffer *rb) | |
68 | { | |
69 | return !!rb->aux_nr_pages; | |
70 | } | |
76369139 | 71 | |
68db7e98 AS |
72 | void perf_event_aux_event(struct perf_event *event, unsigned long head, |
73 | unsigned long size, u64 flags); | |
74 | ||
76369139 FW |
75 | extern void |
76 | perf_event_header__init_id(struct perf_event_header *header, | |
77 | struct perf_sample_data *data, | |
78 | struct perf_event *event); | |
79 | extern void | |
80 | perf_event__output_id_sample(struct perf_event *event, | |
81 | struct perf_output_handle *handle, | |
82 | struct perf_sample_data *sample); | |
83 | ||
84 | extern struct page * | |
85 | perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); | |
86 | ||
87 | #ifdef CONFIG_PERF_USE_VMALLOC | |
88 | /* | |
89 | * Back perf_mmap() with vmalloc memory. | |
90 | * | |
91 | * Required for architectures that have d-cache aliasing issues. | |
92 | */ | |
93 | ||
94 | static inline int page_order(struct ring_buffer *rb) | |
95 | { | |
96 | return rb->page_order; | |
97 | } | |
98 | ||
99 | #else | |
100 | ||
101 | static inline int page_order(struct ring_buffer *rb) | |
102 | { | |
103 | return 0; | |
104 | } | |
105 | #endif | |
106 | ||
9251f904 | 107 | static inline unsigned long perf_data_size(struct ring_buffer *rb) |
76369139 FW |
108 | { |
109 | return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); | |
110 | } | |
111 | ||
45bfb2e5 PZ |
112 | static inline unsigned long perf_aux_size(struct ring_buffer *rb) |
113 | { | |
114 | return rb->aux_nr_pages << PAGE_SHIFT; | |
115 | } | |
116 | ||
91d7753a | 117 | #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ |
0a196848 | 118 | static inline unsigned long \ |
91d7753a | 119 | func_name(struct perf_output_handle *handle, \ |
0a196848 | 120 | const void *buf, unsigned long len) \ |
91d7753a FW |
121 | { \ |
122 | unsigned long size, written; \ | |
123 | \ | |
124 | do { \ | |
0a196848 | 125 | size = min(handle->size, len); \ |
91d7753a | 126 | written = memcpy_func(handle->addr, buf, size); \ |
0a196848 | 127 | written = size - written; \ |
91d7753a FW |
128 | \ |
129 | len -= written; \ | |
130 | handle->addr += written; \ | |
131 | buf += written; \ | |
132 | handle->size -= written; \ | |
133 | if (!handle->size) { \ | |
134 | struct ring_buffer *rb = handle->rb; \ | |
135 | \ | |
136 | handle->page++; \ | |
137 | handle->page &= rb->nr_pages - 1; \ | |
138 | handle->addr = rb->data_pages[handle->page]; \ | |
139 | handle->size = PAGE_SIZE << page_order(rb); \ | |
140 | } \ | |
141 | } while (len && written == size); \ | |
142 | \ | |
143 | return len; \ | |
144 | } | |
145 | ||
0a196848 PZ |
146 | static inline unsigned long |
147 | memcpy_common(void *dst, const void *src, unsigned long n) | |
76369139 | 148 | { |
91d7753a | 149 | memcpy(dst, src, n); |
0a196848 | 150 | return 0; |
76369139 FW |
151 | } |
152 | ||
91d7753a FW |
153 | DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) |
154 | ||
0a196848 PZ |
155 | static inline unsigned long |
156 | memcpy_skip(void *dst, const void *src, unsigned long n) | |
157 | { | |
158 | return 0; | |
159 | } | |
5685e0ff | 160 | |
0a196848 | 161 | DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) |
5685e0ff | 162 | |
91d7753a | 163 | #ifndef arch_perf_out_copy_user |
0a196848 PZ |
164 | #define arch_perf_out_copy_user arch_perf_out_copy_user |
165 | ||
166 | static inline unsigned long | |
167 | arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) | |
168 | { | |
169 | unsigned long ret; | |
170 | ||
171 | pagefault_disable(); | |
172 | ret = __copy_from_user_inatomic(dst, src, n); | |
173 | pagefault_enable(); | |
174 | ||
175 | return ret; | |
176 | } | |
91d7753a FW |
177 | #endif |
178 | ||
179 | DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) | |
180 | ||
9251f904 | 181 | /* Callchain handling */ |
e6dab5ff AV |
182 | extern struct perf_callchain_entry * |
183 | perf_callchain(struct perf_event *event, struct pt_regs *regs); | |
9251f904 BP |
184 | extern int get_callchain_buffers(void); |
185 | extern void put_callchain_buffers(void); | |
186 | ||
187 | static inline int get_recursion_context(int *recursion) | |
188 | { | |
189 | int rctx; | |
190 | ||
191 | if (in_nmi()) | |
192 | rctx = 3; | |
193 | else if (in_irq()) | |
194 | rctx = 2; | |
195 | else if (in_softirq()) | |
196 | rctx = 1; | |
197 | else | |
198 | rctx = 0; | |
199 | ||
200 | if (recursion[rctx]) | |
201 | return -1; | |
202 | ||
203 | recursion[rctx]++; | |
204 | barrier(); | |
205 | ||
206 | return rctx; | |
207 | } | |
208 | ||
209 | static inline void put_recursion_context(int *recursion, int rctx) | |
210 | { | |
211 | barrier(); | |
212 | recursion[rctx]--; | |
213 | } | |
214 | ||
c5ebcedb JO |
215 | #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP |
216 | static inline bool arch_perf_have_user_stack_dump(void) | |
217 | { | |
218 | return true; | |
219 | } | |
220 | ||
221 | #define perf_user_stack_pointer(regs) user_stack_pointer(regs) | |
222 | #else | |
223 | static inline bool arch_perf_have_user_stack_dump(void) | |
224 | { | |
225 | return false; | |
226 | } | |
227 | ||
228 | #define perf_user_stack_pointer(regs) 0 | |
229 | #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ | |
230 | ||
76369139 | 231 | #endif /* _KERNEL_EVENTS_INTERNAL_H */ |