Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 1 | #ifndef _KERNEL_EVENTS_INTERNAL_H |
| 2 | #define _KERNEL_EVENTS_INTERNAL_H |
| 3 | |
Borislav Petkov | 9251f90 | 2011-10-16 17:15:04 +0200 | [diff] [blame] | 4 | #include <linux/hardirq.h> |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 5 | #include <linux/uaccess.h> |
Borislav Petkov | 9251f90 | 2011-10-16 17:15:04 +0200 | [diff] [blame] | 6 | |
| 7 | /* Buffer handling */ |
| 8 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 9 | #define RING_BUFFER_WRITABLE 0x01 |
| 10 | |
| 11 | struct ring_buffer { |
| 12 | atomic_t refcount; |
| 13 | struct rcu_head rcu_head; |
| 14 | #ifdef CONFIG_PERF_USE_VMALLOC |
| 15 | struct work_struct work; |
| 16 | int page_order; /* allocation order */ |
| 17 | #endif |
| 18 | int nr_pages; /* nr of data pages */ |
Stephane Eranian | dd9c086 | 2013-03-18 14:33:28 +0100 | [diff] [blame] | 19 | int overwrite; /* can overwrite itself */ |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 20 | |
| 21 | atomic_t poll; /* POLL_ for wakeups */ |
| 22 | |
| 23 | local_t head; /* write position */ |
| 24 | local_t nest; /* nested writers */ |
| 25 | local_t events; /* event limit */ |
| 26 | local_t wakeup; /* wakeup stamp */ |
| 27 | local_t lost; /* nr records lost */ |
| 28 | |
| 29 | long watermark; /* wakeup watermark */ |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 30 | /* poll crap */ |
| 31 | spinlock_t event_lock; |
| 32 | struct list_head event_list; |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 33 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 34 | atomic_t mmap_count; |
| 35 | unsigned long mmap_locked; |
Peter Zijlstra | 26cb63a | 2013-05-28 10:55:48 +0200 | [diff] [blame] | 36 | struct user_struct *mmap_user; |
| 37 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 38 | struct perf_event_mmap_page *user_page; |
| 39 | void *data_pages[0]; |
| 40 | }; |
| 41 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 42 | extern void rb_free(struct ring_buffer *rb); |
| 43 | extern struct ring_buffer * |
| 44 | rb_alloc(int nr_pages, long watermark, int cpu, int flags); |
| 45 | extern void perf_event_wakeup(struct perf_event *event); |
| 46 | |
| 47 | extern void |
| 48 | perf_event_header__init_id(struct perf_event_header *header, |
| 49 | struct perf_sample_data *data, |
| 50 | struct perf_event *event); |
| 51 | extern void |
| 52 | perf_event__output_id_sample(struct perf_event *event, |
| 53 | struct perf_output_handle *handle, |
| 54 | struct perf_sample_data *sample); |
| 55 | |
| 56 | extern struct page * |
| 57 | perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); |
| 58 | |
| 59 | #ifdef CONFIG_PERF_USE_VMALLOC |
| 60 | /* |
| 61 | * Back perf_mmap() with vmalloc memory. |
| 62 | * |
| 63 | * Required for architectures that have d-cache aliasing issues. |
| 64 | */ |
| 65 | |
| 66 | static inline int page_order(struct ring_buffer *rb) |
| 67 | { |
| 68 | return rb->page_order; |
| 69 | } |
| 70 | |
| 71 | #else |
| 72 | |
| 73 | static inline int page_order(struct ring_buffer *rb) |
| 74 | { |
| 75 | return 0; |
| 76 | } |
| 77 | #endif |
| 78 | |
Borislav Petkov | 9251f90 | 2011-10-16 17:15:04 +0200 | [diff] [blame] | 79 | static inline unsigned long perf_data_size(struct ring_buffer *rb) |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 80 | { |
| 81 | return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); |
| 82 | } |
| 83 | |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 84 | #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 85 | static inline unsigned long \ |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 86 | func_name(struct perf_output_handle *handle, \ |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 87 | const void *buf, unsigned long len) \ |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 88 | { \ |
| 89 | unsigned long size, written; \ |
| 90 | \ |
| 91 | do { \ |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 92 | size = min(handle->size, len); \ |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 93 | written = memcpy_func(handle->addr, buf, size); \ |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 94 | written = size - written; \ |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 95 | \ |
| 96 | len -= written; \ |
| 97 | handle->addr += written; \ |
| 98 | buf += written; \ |
| 99 | handle->size -= written; \ |
| 100 | if (!handle->size) { \ |
| 101 | struct ring_buffer *rb = handle->rb; \ |
| 102 | \ |
| 103 | handle->page++; \ |
| 104 | handle->page &= rb->nr_pages - 1; \ |
| 105 | handle->addr = rb->data_pages[handle->page]; \ |
| 106 | handle->size = PAGE_SIZE << page_order(rb); \ |
| 107 | } \ |
| 108 | } while (len && written == size); \ |
| 109 | \ |
| 110 | return len; \ |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 111 | } |
| 112 | |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 113 | static inline unsigned long |
| 114 | memcpy_common(void *dst, const void *src, unsigned long n) |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 115 | { |
| 116 | memcpy(dst, src, n); |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 117 | return 0; |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) |
| 121 | |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 122 | static inline unsigned long |
| 123 | memcpy_skip(void *dst, const void *src, unsigned long n) |
| 124 | { |
| 125 | return 0; |
| 126 | } |
Jiri Olsa | 5685e0f | 2012-08-07 15:20:39 +0200 | [diff] [blame] | 127 | |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 128 | DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) |
Jiri Olsa | 5685e0f | 2012-08-07 15:20:39 +0200 | [diff] [blame] | 129 | |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 130 | #ifndef arch_perf_out_copy_user |
Peter Zijlstra | 0a19684 | 2013-10-30 21:16:22 +0100 | [diff] [blame] | 131 | #define arch_perf_out_copy_user arch_perf_out_copy_user |
| 132 | |
| 133 | static inline unsigned long |
| 134 | arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) |
| 135 | { |
| 136 | unsigned long ret; |
| 137 | |
| 138 | pagefault_disable(); |
| 139 | ret = __copy_from_user_inatomic(dst, src, n); |
| 140 | pagefault_enable(); |
| 141 | |
| 142 | return ret; |
| 143 | } |
Frederic Weisbecker | 91d7753 | 2012-08-07 15:20:38 +0200 | [diff] [blame] | 144 | #endif |
| 145 | |
| 146 | DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) |
| 147 | |
Borislav Petkov | 9251f90 | 2011-10-16 17:15:04 +0200 | [diff] [blame] | 148 | /* Callchain handling */ |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 149 | extern struct perf_callchain_entry * |
| 150 | perf_callchain(struct perf_event *event, struct pt_regs *regs); |
Borislav Petkov | 9251f90 | 2011-10-16 17:15:04 +0200 | [diff] [blame] | 151 | extern int get_callchain_buffers(void); |
| 152 | extern void put_callchain_buffers(void); |
| 153 | |
| 154 | static inline int get_recursion_context(int *recursion) |
| 155 | { |
| 156 | int rctx; |
| 157 | |
| 158 | if (in_nmi()) |
| 159 | rctx = 3; |
| 160 | else if (in_irq()) |
| 161 | rctx = 2; |
| 162 | else if (in_softirq()) |
| 163 | rctx = 1; |
| 164 | else |
| 165 | rctx = 0; |
| 166 | |
| 167 | if (recursion[rctx]) |
| 168 | return -1; |
| 169 | |
| 170 | recursion[rctx]++; |
| 171 | barrier(); |
| 172 | |
| 173 | return rctx; |
| 174 | } |
| 175 | |
| 176 | static inline void put_recursion_context(int *recursion, int rctx) |
| 177 | { |
| 178 | barrier(); |
| 179 | recursion[rctx]--; |
| 180 | } |
| 181 | |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 182 | #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP |
| 183 | static inline bool arch_perf_have_user_stack_dump(void) |
| 184 | { |
| 185 | return true; |
| 186 | } |
| 187 | |
| 188 | #define perf_user_stack_pointer(regs) user_stack_pointer(regs) |
| 189 | #else |
| 190 | static inline bool arch_perf_have_user_stack_dump(void) |
| 191 | { |
| 192 | return false; |
| 193 | } |
| 194 | |
| 195 | #define perf_user_stack_pointer(regs) 0 |
| 196 | #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ |
| 197 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 198 | #endif /* _KERNEL_EVENTS_INTERNAL_H */ |