178 lines
4.0 KiB
C
178 lines
4.0 KiB
C
#ifndef _KERNEL_EVENTS_INTERNAL_H
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#define _KERNEL_EVENTS_INTERNAL_H
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#include <linux/hardirq.h>
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#include <linux/uaccess.h>
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/* Buffer handling */
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#define RING_BUFFER_WRITABLE 0x01
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struct ring_buffer {
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atomic_t refcount;
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struct rcu_head rcu_head;
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#ifdef CONFIG_PERF_USE_VMALLOC
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struct work_struct work;
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int page_order; /* allocation order */
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#endif
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int nr_pages; /* nr of data pages */
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int writable; /* are we writable */
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atomic_t poll; /* POLL_ for wakeups */
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local_t head; /* write position */
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local_t nest; /* nested writers */
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local_t events; /* event limit */
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local_t wakeup; /* wakeup stamp */
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local_t lost; /* nr records lost */
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long watermark; /* wakeup watermark */
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/* poll crap */
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spinlock_t event_lock;
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struct list_head event_list;
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struct perf_event_mmap_page *user_page;
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void *data_pages[0];
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};
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extern void rb_free(struct ring_buffer *rb);
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extern struct ring_buffer *
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rb_alloc(int nr_pages, long watermark, int cpu, int flags);
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extern void perf_event_wakeup(struct perf_event *event);
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extern void
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perf_event_header__init_id(struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_event *event);
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extern void
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perf_event__output_id_sample(struct perf_event *event,
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struct perf_output_handle *handle,
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struct perf_sample_data *sample);
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extern struct page *
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perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
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#ifdef CONFIG_PERF_USE_VMALLOC
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/*
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* Back perf_mmap() with vmalloc memory.
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*
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* Required for architectures that have d-cache aliasing issues.
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*/
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static inline int page_order(struct ring_buffer *rb)
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{
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return rb->page_order;
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}
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#else
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static inline int page_order(struct ring_buffer *rb)
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{
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return 0;
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}
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#endif
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static inline unsigned long perf_data_size(struct ring_buffer *rb)
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{
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return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
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}
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#define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \
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static inline unsigned int \
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func_name(struct perf_output_handle *handle, \
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const void *buf, unsigned int len) \
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{ \
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unsigned long size, written; \
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\
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do { \
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size = min_t(unsigned long, handle->size, len); \
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\
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written = memcpy_func(handle->addr, buf, size); \
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\
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len -= written; \
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handle->addr += written; \
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buf += written; \
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handle->size -= written; \
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if (!handle->size) { \
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struct ring_buffer *rb = handle->rb; \
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\
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handle->page++; \
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handle->page &= rb->nr_pages - 1; \
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handle->addr = rb->data_pages[handle->page]; \
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handle->size = PAGE_SIZE << page_order(rb); \
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} \
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} while (len && written == size); \
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\
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return len; \
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}
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static inline int memcpy_common(void *dst, const void *src, size_t n)
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{
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memcpy(dst, src, n);
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return n;
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}
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DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
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#define MEMCPY_SKIP(dst, src, n) (n)
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DEFINE_OUTPUT_COPY(__output_skip, MEMCPY_SKIP)
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#ifndef arch_perf_out_copy_user
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#define arch_perf_out_copy_user __copy_from_user_inatomic
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#endif
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DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)
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/* Callchain handling */
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extern struct perf_callchain_entry *
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perf_callchain(struct perf_event *event, struct pt_regs *regs);
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extern int get_callchain_buffers(void);
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extern void put_callchain_buffers(void);
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static inline int get_recursion_context(int *recursion)
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{
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int rctx;
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if (in_nmi())
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rctx = 3;
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else if (in_irq())
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rctx = 2;
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else if (in_softirq())
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rctx = 1;
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else
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rctx = 0;
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if (recursion[rctx])
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return -1;
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recursion[rctx]++;
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barrier();
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return rctx;
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}
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static inline void put_recursion_context(int *recursion, int rctx)
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{
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barrier();
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recursion[rctx]--;
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}
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#ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP
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static inline bool arch_perf_have_user_stack_dump(void)
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{
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return true;
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}
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#define perf_user_stack_pointer(regs) user_stack_pointer(regs)
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#else
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static inline bool arch_perf_have_user_stack_dump(void)
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{
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return false;
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}
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#define perf_user_stack_pointer(regs) 0
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#endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */
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#endif /* _KERNEL_EVENTS_INTERNAL_H */
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