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