Commit | Line | Data |
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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; | |
57ffc5ca | 14 | struct irq_work irq_work; |
76369139 FW |
15 | #ifdef CONFIG_PERF_USE_VMALLOC |
16 | struct work_struct work; | |
17 | int page_order; /* allocation order */ | |
18 | #endif | |
19 | int nr_pages; /* nr of data pages */ | |
dd9c086d | 20 | int overwrite; /* can overwrite itself */ |
76369139 FW |
21 | |
22 | atomic_t poll; /* POLL_ for wakeups */ | |
23 | ||
24 | local_t head; /* write position */ | |
25 | local_t nest; /* nested writers */ | |
26 | local_t events; /* event limit */ | |
27 | local_t wakeup; /* wakeup stamp */ | |
28 | local_t lost; /* nr records lost */ | |
29 | ||
30 | long watermark; /* wakeup watermark */ | |
1a594131 | 31 | long aux_watermark; |
10c6db11 PZ |
32 | /* poll crap */ |
33 | spinlock_t event_lock; | |
34 | struct list_head event_list; | |
76369139 | 35 | |
9bb5d40c PZ |
36 | atomic_t mmap_count; |
37 | unsigned long mmap_locked; | |
26cb63ad PZ |
38 | struct user_struct *mmap_user; |
39 | ||
45bfb2e5 | 40 | /* AUX area */ |
fdc26706 AS |
41 | local_t aux_head; |
42 | local_t aux_nest; | |
1a594131 | 43 | local_t aux_wakeup; |
45bfb2e5 PZ |
44 | unsigned long aux_pgoff; |
45 | int aux_nr_pages; | |
2023a0d2 | 46 | int aux_overwrite; |
45bfb2e5 PZ |
47 | atomic_t aux_mmap_count; |
48 | unsigned long aux_mmap_locked; | |
49 | void (*free_aux)(void *); | |
50 | atomic_t aux_refcount; | |
51 | void **aux_pages; | |
52 | void *aux_priv; | |
53 | ||
76369139 FW |
54 | struct perf_event_mmap_page *user_page; |
55 | void *data_pages[0]; | |
56 | }; | |
57 | ||
76369139 | 58 | extern void rb_free(struct ring_buffer *rb); |
57ffc5ca PZ |
59 | |
60 | static inline void rb_free_rcu(struct rcu_head *rcu_head) | |
61 | { | |
62 | struct ring_buffer *rb; | |
63 | ||
64 | rb = container_of(rcu_head, struct ring_buffer, rcu_head); | |
65 | rb_free(rb); | |
66 | } | |
67 | ||
76369139 FW |
68 | extern struct ring_buffer * |
69 | rb_alloc(int nr_pages, long watermark, int cpu, int flags); | |
70 | extern void perf_event_wakeup(struct perf_event *event); | |
45bfb2e5 | 71 | extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, |
1a594131 | 72 | pgoff_t pgoff, int nr_pages, long watermark, int flags); |
45bfb2e5 | 73 | extern void rb_free_aux(struct ring_buffer *rb); |
fdc26706 AS |
74 | extern struct ring_buffer *ring_buffer_get(struct perf_event *event); |
75 | extern void ring_buffer_put(struct ring_buffer *rb); | |
45bfb2e5 PZ |
76 | |
77 | static inline bool rb_has_aux(struct ring_buffer *rb) | |
78 | { | |
79 | return !!rb->aux_nr_pages; | |
80 | } | |
76369139 | 81 | |
68db7e98 AS |
82 | void perf_event_aux_event(struct perf_event *event, unsigned long head, |
83 | unsigned long size, u64 flags); | |
84 | ||
76369139 FW |
85 | extern struct page * |
86 | perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); | |
87 | ||
88 | #ifdef CONFIG_PERF_USE_VMALLOC | |
89 | /* | |
90 | * Back perf_mmap() with vmalloc memory. | |
91 | * | |
92 | * Required for architectures that have d-cache aliasing issues. | |
93 | */ | |
94 | ||
95 | static inline int page_order(struct ring_buffer *rb) | |
96 | { | |
97 | return rb->page_order; | |
98 | } | |
99 | ||
100 | #else | |
101 | ||
102 | static inline int page_order(struct ring_buffer *rb) | |
103 | { | |
104 | return 0; | |
105 | } | |
106 | #endif | |
107 | ||
9251f904 | 108 | static inline unsigned long perf_data_size(struct ring_buffer *rb) |
76369139 FW |
109 | { |
110 | return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); | |
111 | } | |
112 | ||
45bfb2e5 PZ |
113 | static inline unsigned long perf_aux_size(struct ring_buffer *rb) |
114 | { | |
115 | return rb->aux_nr_pages << PAGE_SHIFT; | |
116 | } | |
117 | ||
91d7753a | 118 | #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ |
0a196848 | 119 | static inline unsigned long \ |
91d7753a | 120 | func_name(struct perf_output_handle *handle, \ |
0a196848 | 121 | const void *buf, unsigned long len) \ |
91d7753a FW |
122 | { \ |
123 | unsigned long size, written; \ | |
124 | \ | |
125 | do { \ | |
0a196848 | 126 | size = min(handle->size, len); \ |
91d7753a | 127 | written = memcpy_func(handle->addr, buf, size); \ |
0a196848 | 128 | written = size - written; \ |
91d7753a FW |
129 | \ |
130 | len -= written; \ | |
131 | handle->addr += written; \ | |
132 | buf += written; \ | |
133 | handle->size -= written; \ | |
134 | if (!handle->size) { \ | |
135 | struct ring_buffer *rb = handle->rb; \ | |
136 | \ | |
137 | handle->page++; \ | |
138 | handle->page &= rb->nr_pages - 1; \ | |
139 | handle->addr = rb->data_pages[handle->page]; \ | |
140 | handle->size = PAGE_SIZE << page_order(rb); \ | |
141 | } \ | |
142 | } while (len && written == size); \ | |
143 | \ | |
144 | return len; \ | |
145 | } | |
146 | ||
0a196848 PZ |
147 | static inline unsigned long |
148 | memcpy_common(void *dst, const void *src, unsigned long n) | |
76369139 | 149 | { |
91d7753a | 150 | memcpy(dst, src, n); |
0a196848 | 151 | return 0; |
76369139 FW |
152 | } |
153 | ||
91d7753a FW |
154 | DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) |
155 | ||
0a196848 PZ |
156 | static inline unsigned long |
157 | memcpy_skip(void *dst, const void *src, unsigned long n) | |
158 | { | |
159 | return 0; | |
160 | } | |
5685e0ff | 161 | |
0a196848 | 162 | DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) |
5685e0ff | 163 | |
91d7753a | 164 | #ifndef arch_perf_out_copy_user |
0a196848 PZ |
165 | #define arch_perf_out_copy_user arch_perf_out_copy_user |
166 | ||
167 | static inline unsigned long | |
168 | arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) | |
169 | { | |
170 | unsigned long ret; | |
171 | ||
172 | pagefault_disable(); | |
173 | ret = __copy_from_user_inatomic(dst, src, n); | |
174 | pagefault_enable(); | |
175 | ||
176 | return ret; | |
177 | } | |
91d7753a FW |
178 | #endif |
179 | ||
180 | DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) | |
181 | ||
9251f904 | 182 | /* Callchain handling */ |
e6dab5ff AV |
183 | extern struct perf_callchain_entry * |
184 | perf_callchain(struct perf_event *event, struct pt_regs *regs); | |
9251f904 BP |
185 | |
186 | static inline int get_recursion_context(int *recursion) | |
187 | { | |
188 | int rctx; | |
189 | ||
190 | if (in_nmi()) | |
191 | rctx = 3; | |
192 | else if (in_irq()) | |
193 | rctx = 2; | |
194 | else if (in_softirq()) | |
195 | rctx = 1; | |
196 | else | |
197 | rctx = 0; | |
198 | ||
199 | if (recursion[rctx]) | |
200 | return -1; | |
201 | ||
202 | recursion[rctx]++; | |
203 | barrier(); | |
204 | ||
205 | return rctx; | |
206 | } | |
207 | ||
208 | static inline void put_recursion_context(int *recursion, int rctx) | |
209 | { | |
210 | barrier(); | |
211 | recursion[rctx]--; | |
212 | } | |
213 | ||
c5ebcedb JO |
214 | #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP |
215 | static inline bool arch_perf_have_user_stack_dump(void) | |
216 | { | |
217 | return true; | |
218 | } | |
219 | ||
220 | #define perf_user_stack_pointer(regs) user_stack_pointer(regs) | |
221 | #else | |
222 | static inline bool arch_perf_have_user_stack_dump(void) | |
223 | { | |
224 | return false; | |
225 | } | |
226 | ||
227 | #define perf_user_stack_pointer(regs) 0 | |
228 | #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ | |
229 | ||
76369139 | 230 | #endif /* _KERNEL_EVENTS_INTERNAL_H */ |