1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _KERNEL_EVENTS_INTERNAL_H
3 #define _KERNEL_EVENTS_INTERNAL_H
5 #include <linux/hardirq.h>
6 #include <linux/uaccess.h>
7 #include <linux/refcount.h>
11 #define RING_BUFFER_WRITABLE 0x01
15 struct rcu_head rcu_head;
16 #ifdef CONFIG_PERF_USE_VMALLOC
17 struct work_struct work;
18 int page_order; /* allocation order */
20 int nr_pages; /* nr of data pages */
21 int overwrite; /* can overwrite itself */
22 int paused; /* can write into ring buffer */
24 atomic_t poll; /* POLL_ for wakeups */
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 */
32 long watermark; /* wakeup watermark */
35 spinlock_t event_lock;
36 struct list_head event_list;
39 unsigned long mmap_locked;
40 struct user_struct *mmap_user;
44 unsigned int aux_nest;
45 long aux_wakeup; /* last aux_watermark boundary crossed by aux_head */
46 unsigned long aux_pgoff;
49 atomic_t aux_mmap_count;
50 unsigned long aux_mmap_locked;
51 void (*free_aux)(void *);
52 refcount_t aux_refcount;
56 struct perf_event_mmap_page *user_page;
60 extern void rb_free(struct ring_buffer *rb);
62 static inline void rb_free_rcu(struct rcu_head *rcu_head)
64 struct ring_buffer *rb;
66 rb = container_of(rcu_head, struct ring_buffer, rcu_head);
70 static inline void rb_toggle_paused(struct ring_buffer *rb, bool pause)
72 if (!pause && rb->nr_pages)
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);
81 extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event,
82 pgoff_t pgoff, int nr_pages, long watermark, int flags);
83 extern void rb_free_aux(struct ring_buffer *rb);
84 extern struct ring_buffer *ring_buffer_get(struct perf_event *event);
85 extern void ring_buffer_put(struct ring_buffer *rb);
87 static inline bool rb_has_aux(struct ring_buffer *rb)
89 return !!rb->aux_nr_pages;
92 void perf_event_aux_event(struct perf_event *event, unsigned long head,
93 unsigned long size, u64 flags);
96 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
98 #ifdef CONFIG_PERF_USE_VMALLOC
100 * Back perf_mmap() with vmalloc memory.
102 * Required for architectures that have d-cache aliasing issues.
105 static inline int page_order(struct ring_buffer *rb)
107 return rb->page_order;
112 static inline int page_order(struct ring_buffer *rb)
118 static inline unsigned long perf_data_size(struct ring_buffer *rb)
120 return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
123 static inline unsigned long perf_aux_size(struct ring_buffer *rb)
125 return rb->aux_nr_pages << PAGE_SHIFT;
128 #define __DEFINE_OUTPUT_COPY_BODY(advance_buf, memcpy_func, ...) \
130 unsigned long size, written; \
133 size = min(handle->size, len); \
134 written = memcpy_func(__VA_ARGS__); \
135 written = size - written; \
138 handle->addr += written; \
141 handle->size -= written; \
142 if (!handle->size) { \
143 struct ring_buffer *rb = handle->rb; \
146 handle->page &= rb->nr_pages - 1; \
147 handle->addr = rb->data_pages[handle->page]; \
148 handle->size = PAGE_SIZE << page_order(rb); \
150 } while (len && written == size); \
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) \
159 __DEFINE_OUTPUT_COPY_BODY(true, memcpy_func, handle->addr, buf, size)
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)
165 unsigned long orig_len = len;
166 __DEFINE_OUTPUT_COPY_BODY(false, copy_func, handle->addr, buf,
167 orig_len - len, size)
170 static inline unsigned long
171 memcpy_common(void *dst, const void *src, unsigned long n)
177 DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
179 static inline unsigned long
180 memcpy_skip(void *dst, const void *src, unsigned long n)
185 DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip)
187 #ifndef arch_perf_out_copy_user
188 #define arch_perf_out_copy_user arch_perf_out_copy_user
190 static inline unsigned long
191 arch_perf_out_copy_user(void *dst, const void *src, unsigned long n)
196 ret = __copy_from_user_inatomic(dst, src, n);
203 DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)
205 static inline int get_recursion_context(int *recursion)
209 if (unlikely(in_nmi()))
213 else if (in_serving_softirq())
227 static inline void put_recursion_context(int *recursion, int rctx)
233 #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP
234 static inline bool arch_perf_have_user_stack_dump(void)
239 #define perf_user_stack_pointer(regs) user_stack_pointer(regs)
241 static inline bool arch_perf_have_user_stack_dump(void)
246 #define perf_user_stack_pointer(regs) 0
247 #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */
249 #endif /* _KERNEL_EVENTS_INTERNAL_H */