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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
76369139 FW |
2 | #ifndef _KERNEL_EVENTS_INTERNAL_H |
3 | #define _KERNEL_EVENTS_INTERNAL_H | |
4 | ||
9251f904 | 5 | #include <linux/hardirq.h> |
91d7753a | 6 | #include <linux/uaccess.h> |
fecb8ed2 | 7 | #include <linux/refcount.h> |
9251f904 BP |
8 | |
9 | /* Buffer handling */ | |
10 | ||
76369139 FW |
11 | #define RING_BUFFER_WRITABLE 0x01 |
12 | ||
13 | struct ring_buffer { | |
fecb8ed2 | 14 | refcount_t refcount; |
76369139 FW |
15 | struct rcu_head rcu_head; |
16 | #ifdef CONFIG_PERF_USE_VMALLOC | |
17 | struct work_struct work; | |
18 | int page_order; /* allocation order */ | |
19 | #endif | |
20 | int nr_pages; /* nr of data pages */ | |
dd9c086d | 21 | int overwrite; /* can overwrite itself */ |
86e7972f | 22 | int paused; /* can write into ring buffer */ |
76369139 FW |
23 | |
24 | atomic_t poll; /* POLL_ for wakeups */ | |
25 | ||
26 | local_t head; /* write position */ | |
5322ea58 | 27 | unsigned int nest; /* nested writers */ |
76369139 FW |
28 | local_t events; /* event limit */ |
29 | local_t wakeup; /* wakeup stamp */ | |
30 | local_t lost; /* nr records lost */ | |
31 | ||
32 | long watermark; /* wakeup watermark */ | |
1a594131 | 33 | long aux_watermark; |
10c6db11 PZ |
34 | /* poll crap */ |
35 | spinlock_t event_lock; | |
36 | struct list_head event_list; | |
76369139 | 37 | |
9bb5d40c PZ |
38 | atomic_t mmap_count; |
39 | unsigned long mmap_locked; | |
26cb63ad PZ |
40 | struct user_struct *mmap_user; |
41 | ||
45bfb2e5 | 42 | /* AUX area */ |
2ab346cf | 43 | long aux_head; |
5322ea58 | 44 | unsigned int aux_nest; |
d9a50b02 | 45 | long aux_wakeup; /* last aux_watermark boundary crossed by aux_head */ |
45bfb2e5 PZ |
46 | unsigned long aux_pgoff; |
47 | int aux_nr_pages; | |
2023a0d2 | 48 | int aux_overwrite; |
45bfb2e5 PZ |
49 | atomic_t aux_mmap_count; |
50 | unsigned long aux_mmap_locked; | |
51 | void (*free_aux)(void *); | |
ca3bb3d0 | 52 | refcount_t aux_refcount; |
45bfb2e5 PZ |
53 | void **aux_pages; |
54 | void *aux_priv; | |
55 | ||
76369139 FW |
56 | struct perf_event_mmap_page *user_page; |
57 | void *data_pages[0]; | |
58 | }; | |
59 | ||
76369139 | 60 | extern void rb_free(struct ring_buffer *rb); |
57ffc5ca PZ |
61 | |
62 | static inline void rb_free_rcu(struct rcu_head *rcu_head) | |
63 | { | |
64 | struct ring_buffer *rb; | |
65 | ||
66 | rb = container_of(rcu_head, struct ring_buffer, rcu_head); | |
67 | rb_free(rb); | |
68 | } | |
69 | ||
86e7972f WN |
70 | static inline void rb_toggle_paused(struct ring_buffer *rb, bool pause) |
71 | { | |
72 | if (!pause && rb->nr_pages) | |
73 | rb->paused = 0; | |
74 | else | |
75 | rb->paused = 1; | |
76 | } | |
77 | ||
76369139 FW |
78 | extern struct ring_buffer * |
79 | rb_alloc(int nr_pages, long watermark, int cpu, int flags); | |
80 | extern void perf_event_wakeup(struct perf_event *event); | |
45bfb2e5 | 81 | extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, |
1a594131 | 82 | pgoff_t pgoff, int nr_pages, long watermark, int flags); |
45bfb2e5 | 83 | extern void rb_free_aux(struct ring_buffer *rb); |
fdc26706 AS |
84 | extern struct ring_buffer *ring_buffer_get(struct perf_event *event); |
85 | extern void ring_buffer_put(struct ring_buffer *rb); | |
45bfb2e5 PZ |
86 | |
87 | static inline bool rb_has_aux(struct ring_buffer *rb) | |
88 | { | |
89 | return !!rb->aux_nr_pages; | |
90 | } | |
76369139 | 91 | |
68db7e98 AS |
92 | void perf_event_aux_event(struct perf_event *event, unsigned long head, |
93 | unsigned long size, u64 flags); | |
94 | ||
76369139 FW |
95 | extern struct page * |
96 | perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); | |
97 | ||
98 | #ifdef CONFIG_PERF_USE_VMALLOC | |
99 | /* | |
100 | * Back perf_mmap() with vmalloc memory. | |
101 | * | |
102 | * Required for architectures that have d-cache aliasing issues. | |
103 | */ | |
104 | ||
105 | static inline int page_order(struct ring_buffer *rb) | |
106 | { | |
107 | return rb->page_order; | |
108 | } | |
109 | ||
110 | #else | |
111 | ||
112 | static inline int page_order(struct ring_buffer *rb) | |
113 | { | |
114 | return 0; | |
115 | } | |
116 | #endif | |
117 | ||
9251f904 | 118 | static inline unsigned long perf_data_size(struct ring_buffer *rb) |
76369139 FW |
119 | { |
120 | return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); | |
121 | } | |
122 | ||
45bfb2e5 PZ |
123 | static inline unsigned long perf_aux_size(struct ring_buffer *rb) |
124 | { | |
125 | return rb->aux_nr_pages << PAGE_SHIFT; | |
126 | } | |
127 | ||
aa7145c1 | 128 | #define __DEFINE_OUTPUT_COPY_BODY(advance_buf, memcpy_func, ...) \ |
91d7753a FW |
129 | { \ |
130 | unsigned long size, written; \ | |
131 | \ | |
132 | do { \ | |
0a196848 | 133 | size = min(handle->size, len); \ |
aa7145c1 | 134 | written = memcpy_func(__VA_ARGS__); \ |
0a196848 | 135 | written = size - written; \ |
91d7753a FW |
136 | \ |
137 | len -= written; \ | |
138 | handle->addr += written; \ | |
aa7145c1 DB |
139 | if (advance_buf) \ |
140 | buf += written; \ | |
91d7753a FW |
141 | handle->size -= written; \ |
142 | if (!handle->size) { \ | |
143 | struct ring_buffer *rb = handle->rb; \ | |
144 | \ | |
145 | handle->page++; \ | |
146 | handle->page &= rb->nr_pages - 1; \ | |
147 | handle->addr = rb->data_pages[handle->page]; \ | |
148 | handle->size = PAGE_SIZE << page_order(rb); \ | |
149 | } \ | |
150 | } while (len && written == size); \ | |
151 | \ | |
152 | return len; \ | |
153 | } | |
154 | ||
7e3f977e DB |
155 | #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ |
156 | static inline unsigned long \ | |
157 | func_name(struct perf_output_handle *handle, \ | |
158 | const void *buf, unsigned long len) \ | |
aa7145c1 | 159 | __DEFINE_OUTPUT_COPY_BODY(true, memcpy_func, handle->addr, buf, size) |
7e3f977e DB |
160 | |
161 | static inline unsigned long | |
162 | __output_custom(struct perf_output_handle *handle, perf_copy_f copy_func, | |
163 | const void *buf, unsigned long len) | |
aa7145c1 DB |
164 | { |
165 | unsigned long orig_len = len; | |
166 | __DEFINE_OUTPUT_COPY_BODY(false, copy_func, handle->addr, buf, | |
167 | orig_len - len, size) | |
168 | } | |
7e3f977e | 169 | |
0a196848 PZ |
170 | static inline unsigned long |
171 | memcpy_common(void *dst, const void *src, unsigned long n) | |
76369139 | 172 | { |
91d7753a | 173 | memcpy(dst, src, n); |
0a196848 | 174 | return 0; |
76369139 FW |
175 | } |
176 | ||
91d7753a FW |
177 | DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) |
178 | ||
0a196848 PZ |
179 | static inline unsigned long |
180 | memcpy_skip(void *dst, const void *src, unsigned long n) | |
181 | { | |
182 | return 0; | |
183 | } | |
5685e0ff | 184 | |
0a196848 | 185 | DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) |
5685e0ff | 186 | |
91d7753a | 187 | #ifndef arch_perf_out_copy_user |
0a196848 PZ |
188 | #define arch_perf_out_copy_user arch_perf_out_copy_user |
189 | ||
190 | static inline unsigned long | |
191 | arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) | |
192 | { | |
193 | unsigned long ret; | |
194 | ||
195 | pagefault_disable(); | |
196 | ret = __copy_from_user_inatomic(dst, src, n); | |
197 | pagefault_enable(); | |
198 | ||
199 | return ret; | |
200 | } | |
91d7753a FW |
201 | #endif |
202 | ||
203 | DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) | |
204 | ||
9251f904 BP |
205 | static inline int get_recursion_context(int *recursion) |
206 | { | |
207 | int rctx; | |
208 | ||
d0618410 | 209 | if (unlikely(in_nmi())) |
9251f904 BP |
210 | rctx = 3; |
211 | else if (in_irq()) | |
212 | rctx = 2; | |
213 | else if (in_softirq()) | |
214 | rctx = 1; | |
215 | else | |
216 | rctx = 0; | |
217 | ||
218 | if (recursion[rctx]) | |
219 | return -1; | |
220 | ||
221 | recursion[rctx]++; | |
222 | barrier(); | |
223 | ||
224 | return rctx; | |
225 | } | |
226 | ||
227 | static inline void put_recursion_context(int *recursion, int rctx) | |
228 | { | |
229 | barrier(); | |
230 | recursion[rctx]--; | |
231 | } | |
232 | ||
c5ebcedb JO |
233 | #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP |
234 | static inline bool arch_perf_have_user_stack_dump(void) | |
235 | { | |
236 | return true; | |
237 | } | |
238 | ||
239 | #define perf_user_stack_pointer(regs) user_stack_pointer(regs) | |
240 | #else | |
241 | static inline bool arch_perf_have_user_stack_dump(void) | |
242 | { | |
243 | return false; | |
244 | } | |
245 | ||
246 | #define perf_user_stack_pointer(regs) 0 | |
247 | #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ | |
248 | ||
76369139 | 249 | #endif /* _KERNEL_EVENTS_INTERNAL_H */ |