Lines Matching full:rb
22 atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM); in perf_output_wakeup()
42 struct perf_buffer *rb = handle->rb; in perf_output_get_handle() local
50 (*(volatile unsigned int *)&rb->nest)++; in perf_output_get_handle()
51 handle->wakeup = local_read(&rb->wakeup); in perf_output_get_handle()
56 struct perf_buffer *rb = handle->rb; in perf_output_put_handle() local
62 * @rb->user_page->data_head. in perf_output_put_handle()
64 nest = READ_ONCE(rb->nest); in perf_output_put_handle()
66 WRITE_ONCE(rb->nest, nest - 1); in perf_output_put_handle()
73 * we must ensure the load of @rb->head happens after we've in perf_output_put_handle()
74 * incremented @rb->nest. in perf_output_put_handle()
76 * Otherwise we can observe a @rb->head value before one published in perf_output_put_handle()
80 head = local_read(&rb->head); in perf_output_put_handle()
83 * IRQ/NMI can happen here and advance @rb->head, causing our in perf_output_put_handle()
114 WRITE_ONCE(rb->user_page->data_head, head); in perf_output_put_handle()
122 WRITE_ONCE(rb->nest, 0); in perf_output_put_handle()
125 * Ensure we decrement @rb->nest before we validate the @rb->head. in perf_output_put_handle()
129 if (unlikely(head != local_read(&rb->head))) { in perf_output_put_handle()
130 WRITE_ONCE(rb->nest, 1); in perf_output_put_handle()
134 if (handle->wakeup != local_read(&rb->wakeup)) in perf_output_put_handle()
158 struct perf_buffer *rb; in __perf_output_begin() local
174 rb = rcu_dereference(event->rb); in __perf_output_begin()
175 if (unlikely(!rb)) in __perf_output_begin()
178 if (unlikely(rb->paused)) { in __perf_output_begin()
179 if (rb->nr_pages) { in __perf_output_begin()
180 local_inc(&rb->lost); in __perf_output_begin()
186 handle->rb = rb; in __perf_output_begin()
190 have_lost = local_read(&rb->lost); in __perf_output_begin()
199 offset = local_read(&rb->head); in __perf_output_begin()
202 tail = READ_ONCE(rb->user_page->data_tail); in __perf_output_begin()
203 if (!rb->overwrite) { in __perf_output_begin()
205 perf_data_size(rb), in __perf_output_begin()
226 } while (!local_try_cmpxchg(&rb->head, &offset, head)); in __perf_output_begin()
238 if (unlikely(head - local_read(&rb->wakeup) > rb->watermark)) in __perf_output_begin()
239 local_add(rb->watermark, &rb->wakeup); in __perf_output_begin()
241 page_shift = PAGE_SHIFT + page_order(rb); in __perf_output_begin()
243 handle->page = (offset >> page_shift) & (rb->nr_pages - 1); in __perf_output_begin()
245 handle->addr = rb->data_pages[handle->page] + offset; in __perf_output_begin()
253 lost_event.lost = local_xchg(&rb->lost, 0); in __perf_output_begin()
264 local_inc(&rb->lost); in __perf_output_begin()
315 ring_buffer_init(struct perf_buffer *rb, long watermark, int flags) in ring_buffer_init() argument
317 long max_size = perf_data_size(rb); in ring_buffer_init()
320 rb->watermark = min(max_size, watermark); in ring_buffer_init()
322 if (!rb->watermark) in ring_buffer_init()
323 rb->watermark = max_size / 2; in ring_buffer_init()
326 rb->overwrite = 0; in ring_buffer_init()
328 rb->overwrite = 1; in ring_buffer_init()
330 refcount_set(&rb->refcount, 1); in ring_buffer_init()
332 INIT_LIST_HEAD(&rb->event_list); in ring_buffer_init()
333 spin_lock_init(&rb->event_lock); in ring_buffer_init()
336 * perf_output_begin() only checks rb->paused, therefore in ring_buffer_init()
337 * rb->paused must be true if we have no pages for output. in ring_buffer_init()
339 if (!rb->nr_pages) in ring_buffer_init()
340 rb->paused = 1; in ring_buffer_init()
342 mutex_init(&rb->aux_mutex); in ring_buffer_init()
377 struct perf_buffer *rb; in perf_aux_output_begin() local
388 rb = ring_buffer_get(output_event); in perf_aux_output_begin()
389 if (!rb) in perf_aux_output_begin()
392 if (!rb_has_aux(rb)) in perf_aux_output_begin()
399 * Checking rb::aux_mmap_count and rb::refcount has to be done in in perf_aux_output_begin()
403 if (!refcount_read(&rb->aux_mmap_count)) in perf_aux_output_begin()
406 if (!refcount_inc_not_zero(&rb->aux_refcount)) in perf_aux_output_begin()
409 nest = READ_ONCE(rb->aux_nest); in perf_aux_output_begin()
417 WRITE_ONCE(rb->aux_nest, nest + 1); in perf_aux_output_begin()
419 aux_head = rb->aux_head; in perf_aux_output_begin()
421 handle->rb = rb; in perf_aux_output_begin()
432 if (!rb->aux_overwrite) { in perf_aux_output_begin()
433 aux_tail = READ_ONCE(rb->user_page->aux_tail); in perf_aux_output_begin()
434 handle->wakeup = rb->aux_wakeup + rb->aux_watermark; in perf_aux_output_begin()
435 if (aux_head - aux_tail < perf_aux_size(rb)) in perf_aux_output_begin()
436 handle->size = CIRC_SPACE(aux_head, aux_tail, perf_aux_size(rb)); in perf_aux_output_begin()
446 WRITE_ONCE(rb->aux_nest, 0); in perf_aux_output_begin()
451 return handle->rb->aux_priv; in perf_aux_output_begin()
455 rb_free_aux(rb); in perf_aux_output_begin()
458 ring_buffer_put(rb); in perf_aux_output_begin()
465 static __always_inline bool rb_need_aux_wakeup(struct perf_buffer *rb) in rb_need_aux_wakeup() argument
467 if (rb->aux_overwrite) in rb_need_aux_wakeup()
470 if (rb->aux_head - rb->aux_wakeup >= rb->aux_watermark) { in rb_need_aux_wakeup()
471 rb->aux_wakeup = rounddown(rb->aux_head, rb->aux_watermark); in rb_need_aux_wakeup()
491 struct perf_buffer *rb = handle->rb; in perf_aux_output_end() local
495 if (rb->aux_overwrite) { in perf_aux_output_end()
499 rb->aux_head = aux_head; in perf_aux_output_end()
503 aux_head = rb->aux_head; in perf_aux_output_end()
504 rb->aux_head += size; in perf_aux_output_end()
523 WRITE_ONCE(rb->user_page->aux_head, rb->aux_head); in perf_aux_output_end()
524 if (rb_need_aux_wakeup(rb)) in perf_aux_output_end()
535 WRITE_ONCE(rb->aux_nest, 0); in perf_aux_output_end()
537 rb_free_aux(rb); in perf_aux_output_end()
538 ring_buffer_put(rb); in perf_aux_output_end()
548 struct perf_buffer *rb = handle->rb; in perf_aux_output_skip() local
553 rb->aux_head += size; in perf_aux_output_skip()
555 WRITE_ONCE(rb->user_page->aux_head, rb->aux_head); in perf_aux_output_skip()
556 if (rb_need_aux_wakeup(rb)) { in perf_aux_output_skip()
558 handle->wakeup = rb->aux_wakeup + rb->aux_watermark; in perf_aux_output_skip()
561 handle->head = rb->aux_head; in perf_aux_output_skip()
574 return handle->rb->aux_priv; in perf_get_aux()
585 struct perf_buffer *rb = aux_handle->rb; in perf_output_copy_aux() local
589 from &= (rb->aux_nr_pages << PAGE_SHIFT) - 1; in perf_output_copy_aux()
590 to &= (rb->aux_nr_pages << PAGE_SHIFT) - 1; in perf_output_copy_aux()
599 addr = rb->aux_pages[from >> PAGE_SHIFT]; in perf_output_copy_aux()
608 from &= (rb->aux_nr_pages << PAGE_SHIFT) - 1; in perf_output_copy_aux()
642 static void rb_free_aux_page(struct perf_buffer *rb, int idx) in rb_free_aux_page() argument
644 struct page *page = virt_to_page(rb->aux_pages[idx]); in rb_free_aux_page()
650 static void __rb_free_aux(struct perf_buffer *rb) in __rb_free_aux() argument
662 if (rb->aux_priv) { in __rb_free_aux()
663 rb->free_aux(rb->aux_priv); in __rb_free_aux()
664 rb->free_aux = NULL; in __rb_free_aux()
665 rb->aux_priv = NULL; in __rb_free_aux()
668 if (rb->aux_nr_pages) { in __rb_free_aux()
669 for (pg = 0; pg < rb->aux_nr_pages; pg++) in __rb_free_aux()
670 rb_free_aux_page(rb, pg); in __rb_free_aux()
672 kfree(rb->aux_pages); in __rb_free_aux()
673 rb->aux_nr_pages = 0; in __rb_free_aux()
677 int rb_alloc_aux(struct perf_buffer *rb, struct perf_event *event, in rb_alloc_aux() argument
731 rb->aux_pages = kcalloc_node(nr_pages, sizeof(void *), GFP_KERNEL, in rb_alloc_aux()
733 if (!rb->aux_pages) in rb_alloc_aux()
736 rb->free_aux = event->pmu->free_aux; in rb_alloc_aux()
737 for (rb->aux_nr_pages = 0; rb->aux_nr_pages < nr_pages;) { in rb_alloc_aux()
741 order = min(max_order, ilog2(nr_pages - rb->aux_nr_pages)); in rb_alloc_aux()
746 for (last = rb->aux_nr_pages + (1 << page_private(page)); in rb_alloc_aux()
747 last > rb->aux_nr_pages; rb->aux_nr_pages++) in rb_alloc_aux()
748 rb->aux_pages[rb->aux_nr_pages] = page_address(page++); in rb_alloc_aux()
759 struct page *page = virt_to_page(rb->aux_pages[0]); in rb_alloc_aux()
765 rb->aux_priv = event->pmu->setup_aux(event, rb->aux_pages, nr_pages, in rb_alloc_aux()
767 if (!rb->aux_priv) in rb_alloc_aux()
778 refcount_set(&rb->aux_refcount, 1); in rb_alloc_aux()
780 rb->aux_overwrite = overwrite; in rb_alloc_aux()
781 rb->aux_watermark = watermark; in rb_alloc_aux()
785 rb->aux_pgoff = pgoff; in rb_alloc_aux()
787 __rb_free_aux(rb); in rb_alloc_aux()
792 void rb_free_aux(struct perf_buffer *rb) in rb_free_aux() argument
794 if (refcount_dec_and_test(&rb->aux_refcount)) in rb_free_aux()
795 __rb_free_aux(rb); in rb_free_aux()
805 __perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff) in __perf_mmap_to_page() argument
807 if (pgoff > rb->nr_pages) in __perf_mmap_to_page()
811 return virt_to_page(rb->user_page); in __perf_mmap_to_page()
813 return virt_to_page(rb->data_pages[pgoff - 1]); in __perf_mmap_to_page()
838 struct perf_buffer *rb; in rb_alloc() local
849 rb = kzalloc_node(size, GFP_KERNEL, node); in rb_alloc()
850 if (!rb) in rb_alloc()
853 rb->user_page = perf_mmap_alloc_page(cpu); in rb_alloc()
854 if (!rb->user_page) in rb_alloc()
858 rb->data_pages[i] = perf_mmap_alloc_page(cpu); in rb_alloc()
859 if (!rb->data_pages[i]) in rb_alloc()
863 rb->nr_pages = nr_pages; in rb_alloc()
865 ring_buffer_init(rb, watermark, flags); in rb_alloc()
867 return rb; in rb_alloc()
871 perf_mmap_free_page(rb->data_pages[i]); in rb_alloc()
873 perf_mmap_free_page(rb->user_page); in rb_alloc()
876 kfree(rb); in rb_alloc()
882 void rb_free(struct perf_buffer *rb) in rb_free() argument
886 perf_mmap_free_page(rb->user_page); in rb_free()
887 for (i = 0; i < rb->nr_pages; i++) in rb_free()
888 perf_mmap_free_page(rb->data_pages[i]); in rb_free()
889 kfree(rb); in rb_free()
894 __perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff) in __perf_mmap_to_page() argument
897 if (pgoff > data_page_nr(rb)) in __perf_mmap_to_page()
900 return vmalloc_to_page((void *)rb->user_page + pgoff * PAGE_SIZE); in __perf_mmap_to_page()
905 struct perf_buffer *rb; in rb_free_work() local
907 rb = container_of(work, struct perf_buffer, work); in rb_free_work()
909 vfree(rb->user_page); in rb_free_work()
910 kfree(rb); in rb_free_work()
913 void rb_free(struct perf_buffer *rb) in rb_free() argument
915 schedule_work(&rb->work); in rb_free()
920 struct perf_buffer *rb; in rb_alloc() local
929 rb = kzalloc_node(size, GFP_KERNEL, node); in rb_alloc()
930 if (!rb) in rb_alloc()
933 INIT_WORK(&rb->work, rb_free_work); in rb_alloc()
939 rb->user_page = all_buf; in rb_alloc()
940 rb->data_pages[0] = all_buf + PAGE_SIZE; in rb_alloc()
942 rb->nr_pages = 1; in rb_alloc()
943 rb->page_order = ilog2(nr_pages); in rb_alloc()
946 ring_buffer_init(rb, watermark, flags); in rb_alloc()
948 return rb; in rb_alloc()
951 kfree(rb); in rb_alloc()
960 perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff) in perf_mmap_to_page() argument
962 if (rb->aux_nr_pages) { in perf_mmap_to_page()
964 if (pgoff > rb->aux_pgoff + rb->aux_nr_pages) in perf_mmap_to_page()
968 if (pgoff >= rb->aux_pgoff) { in perf_mmap_to_page()
969 int aux_pgoff = array_index_nospec(pgoff - rb->aux_pgoff, rb->aux_nr_pages); in perf_mmap_to_page()
970 return virt_to_page(rb->aux_pages[aux_pgoff]); in perf_mmap_to_page()
974 return __perf_mmap_to_page(rb, pgoff); in perf_mmap_to_page()