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