22 	atomic_set(&handle->rb->poll, EPOLLIN);  in perf_output_wakeup()
38 	struct ring_buffer *rb = handle->rb;  in perf_output_get_handle()  local
46 	(*(volatile unsigned int *)&rb->nest)++;  in perf_output_get_handle()
47 	handle->wakeup = local_read(&rb->wakeup);  in perf_output_get_handle()
52 	struct ring_buffer *rb = handle->rb;  in perf_output_put_handle()  local
60 	nest = READ_ONCE(rb->nest);  in perf_output_put_handle()
62 		WRITE_ONCE(rb->nest, nest - 1);  in perf_output_put_handle()
76 	head = local_read(&rb->head);  in perf_output_put_handle()
110 	WRITE_ONCE(rb->user_page->data_head, head);  in perf_output_put_handle()
118 	WRITE_ONCE(rb->nest, 0);  in perf_output_put_handle()
125 	if (unlikely(head != local_read(&rb->head))) {  in perf_output_put_handle()
126 		WRITE_ONCE(rb->nest, 1);  in perf_output_put_handle()
130 	if (handle->wakeup != local_read(&rb->wakeup))  in perf_output_put_handle()
153 	struct ring_buffer *rb;  in __perf_output_begin()  local
169 	rb = rcu_dereference(event->rb);  in __perf_output_begin()
170 	if (unlikely(!rb))  in __perf_output_begin()
173 	if (unlikely(rb->paused)) {  in __perf_output_begin()
174 		if (rb->nr_pages)  in __perf_output_begin()
175 			local_inc(&rb->lost);  in __perf_output_begin()
179 	handle->rb    = rb;  in __perf_output_begin()
182 	have_lost = local_read(&rb->lost);  in __perf_output_begin()
192 		tail = READ_ONCE(rb->user_page->data_tail);  in __perf_output_begin()
193 		offset = head = local_read(&rb->head);  in __perf_output_begin()
194 		if (!rb->overwrite) {  in __perf_output_begin()
196 							    perf_data_size(rb),  in __perf_output_begin()
217 	} while (local_cmpxchg(&rb->head, offset, head) != offset);  in __perf_output_begin()
229 	if (unlikely(head - local_read(&rb->wakeup) > rb->watermark))  in __perf_output_begin()
230 		local_add(rb->watermark, &rb->wakeup);  in __perf_output_begin()
232 	page_shift = PAGE_SHIFT + page_order(rb);  in __perf_output_begin()
234 	handle->page = (offset >> page_shift) & (rb->nr_pages - 1);  in __perf_output_begin()
236 	handle->addr = rb->data_pages[handle->page] + offset;  in __perf_output_begin()
246 		lost_event.lost        = local_xchg(&rb->lost, 0);  in __perf_output_begin()
257 	local_inc(&rb->lost);  in __perf_output_begin()
304 ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)  in ring_buffer_init()  argument
306 	long max_size = perf_data_size(rb);  in ring_buffer_init()
309 		rb->watermark = min(max_size, watermark);  in ring_buffer_init()
311 	if (!rb->watermark)  in ring_buffer_init()
312 		rb->watermark = max_size / 2;  in ring_buffer_init()
315 		rb->overwrite = 0;  in ring_buffer_init()
317 		rb->overwrite = 1;  in ring_buffer_init()
319 	refcount_set(&rb->refcount, 1);  in ring_buffer_init()
321 	INIT_LIST_HEAD(&rb->event_list);  in ring_buffer_init()
322 	spin_lock_init(&rb->event_lock);  in ring_buffer_init()
328 	if (!rb->nr_pages)  in ring_buffer_init()
329 		rb->paused = 1;  in ring_buffer_init()
364 	struct ring_buffer *rb;  in perf_aux_output_begin()  local
375 	rb = ring_buffer_get(output_event);  in perf_aux_output_begin()
376 	if (!rb)  in perf_aux_output_begin()
379 	if (!rb_has_aux(rb))  in perf_aux_output_begin()
390 	if (!atomic_read(&rb->aux_mmap_count))  in perf_aux_output_begin()
393 	if (!refcount_inc_not_zero(&rb->aux_refcount))  in perf_aux_output_begin()
396 	nest = READ_ONCE(rb->aux_nest);  in perf_aux_output_begin()
404 	WRITE_ONCE(rb->aux_nest, nest + 1);  in perf_aux_output_begin()
406 	aux_head = rb->aux_head;  in perf_aux_output_begin()
408 	handle->rb = rb;  in perf_aux_output_begin()
419 	if (!rb->aux_overwrite) {  in perf_aux_output_begin()
420 		aux_tail = READ_ONCE(rb->user_page->aux_tail);  in perf_aux_output_begin()
421 		handle->wakeup = rb->aux_wakeup + rb->aux_watermark;  in perf_aux_output_begin()
422 		if (aux_head - aux_tail < perf_aux_size(rb))  in perf_aux_output_begin()
423 			handle->size = CIRC_SPACE(aux_head, aux_tail, perf_aux_size(rb));  in perf_aux_output_begin()
433 			WRITE_ONCE(rb->aux_nest, 0);  in perf_aux_output_begin()
438 	return handle->rb->aux_priv;  in perf_aux_output_begin()
442 	rb_free_aux(rb);  in perf_aux_output_begin()
445 	ring_buffer_put(rb);  in perf_aux_output_begin()
452 static __always_inline bool rb_need_aux_wakeup(struct ring_buffer *rb)  in rb_need_aux_wakeup()  argument
454 	if (rb->aux_overwrite)  in rb_need_aux_wakeup()
457 	if (rb->aux_head - rb->aux_wakeup >= rb->aux_watermark) {  in rb_need_aux_wakeup()
458 		rb->aux_wakeup = rounddown(rb->aux_head, rb->aux_watermark);  in rb_need_aux_wakeup()
478 	struct ring_buffer *rb = handle->rb;  in perf_aux_output_end()  local
482 	if (rb->aux_overwrite) {  in perf_aux_output_end()
486 		rb->aux_head = aux_head;  in perf_aux_output_end()
490 		aux_head = rb->aux_head;  in perf_aux_output_end()
491 		rb->aux_head += size;  in perf_aux_output_end()
510 	WRITE_ONCE(rb->user_page->aux_head, rb->aux_head);  in perf_aux_output_end()
511 	if (rb_need_aux_wakeup(rb))  in perf_aux_output_end()
522 	WRITE_ONCE(rb->aux_nest, 0);  in perf_aux_output_end()
524 	rb_free_aux(rb);  in perf_aux_output_end()
525 	ring_buffer_put(rb);  in perf_aux_output_end()
535 	struct ring_buffer *rb = handle->rb;  in perf_aux_output_skip()  local
540 	rb->aux_head += size;  in perf_aux_output_skip()
542 	WRITE_ONCE(rb->user_page->aux_head, rb->aux_head);  in perf_aux_output_skip()
543 	if (rb_need_aux_wakeup(rb)) {  in perf_aux_output_skip()
545 		handle->wakeup = rb->aux_wakeup + rb->aux_watermark;  in perf_aux_output_skip()
548 	handle->head = rb->aux_head;  in perf_aux_output_skip()
561 	return handle->rb->aux_priv;  in perf_get_aux()
593 static void rb_free_aux_page(struct ring_buffer *rb, int idx)  in rb_free_aux_page()  argument
595 	struct page *page = virt_to_page(rb->aux_pages[idx]);  in rb_free_aux_page()
602 static void __rb_free_aux(struct ring_buffer *rb)  in __rb_free_aux()  argument
614 	if (rb->aux_priv) {  in __rb_free_aux()
615 		rb->free_aux(rb->aux_priv);  in __rb_free_aux()
616 		rb->free_aux = NULL;  in __rb_free_aux()
617 		rb->aux_priv = NULL;  in __rb_free_aux()
620 	if (rb->aux_nr_pages) {  in __rb_free_aux()
621 		for (pg = 0; pg < rb->aux_nr_pages; pg++)  in __rb_free_aux()
622 			rb_free_aux_page(rb, pg);  in __rb_free_aux()
624 		kfree(rb->aux_pages);  in __rb_free_aux()
625 		rb->aux_nr_pages = 0;  in __rb_free_aux()
629 int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event,  in rb_alloc_aux()  argument
656 	rb->aux_pages = kcalloc_node(nr_pages, sizeof(void *), GFP_KERNEL,  in rb_alloc_aux()
658 	if (!rb->aux_pages)  in rb_alloc_aux()
661 	rb->free_aux = event->pmu->free_aux;  in rb_alloc_aux()
662 	for (rb->aux_nr_pages = 0; rb->aux_nr_pages < nr_pages;) {  in rb_alloc_aux()
666 		order = min(max_order, ilog2(nr_pages - rb->aux_nr_pages));  in rb_alloc_aux()
671 		for (last = rb->aux_nr_pages + (1 << page_private(page));  in rb_alloc_aux()
672 		     last > rb->aux_nr_pages; rb->aux_nr_pages++)  in rb_alloc_aux()
673 			rb->aux_pages[rb->aux_nr_pages] = page_address(page++);  in rb_alloc_aux()
684 		struct page *page = virt_to_page(rb->aux_pages[0]);  in rb_alloc_aux()
690 	rb->aux_priv = event->pmu->setup_aux(event, rb->aux_pages, nr_pages,  in rb_alloc_aux()
692 	if (!rb->aux_priv)  in rb_alloc_aux()
703 	refcount_set(&rb->aux_refcount, 1);  in rb_alloc_aux()
705 	rb->aux_overwrite = overwrite;  in rb_alloc_aux()
706 	rb->aux_watermark = watermark;  in rb_alloc_aux()
708 	if (!rb->aux_watermark && !rb->aux_overwrite)  in rb_alloc_aux()
709 		rb->aux_watermark = nr_pages << (PAGE_SHIFT - 1);  in rb_alloc_aux()
713 		rb->aux_pgoff = pgoff;  in rb_alloc_aux()
715 		__rb_free_aux(rb);  in rb_alloc_aux()
720 void rb_free_aux(struct ring_buffer *rb)  in rb_free_aux()  argument
722 	if (refcount_dec_and_test(&rb->aux_refcount))  in rb_free_aux()
723 		__rb_free_aux(rb);  in rb_free_aux()
733 __perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)  in __perf_mmap_to_page()  argument
735 	if (pgoff > rb->nr_pages)  in __perf_mmap_to_page()
739 		return virt_to_page(rb->user_page);  in __perf_mmap_to_page()
741 	return virt_to_page(rb->data_pages[pgoff - 1]);  in __perf_mmap_to_page()
759 	struct ring_buffer *rb;  in rb_alloc()  local
769 	rb = kzalloc(size, GFP_KERNEL);  in rb_alloc()
770 	if (!rb)  in rb_alloc()
773 	rb->user_page = perf_mmap_alloc_page(cpu);  in rb_alloc()
774 	if (!rb->user_page)  in rb_alloc()
778 		rb->data_pages[i] = perf_mmap_alloc_page(cpu);  in rb_alloc()
779 		if (!rb->data_pages[i])  in rb_alloc()
783 	rb->nr_pages = nr_pages;  in rb_alloc()
785 	ring_buffer_init(rb, watermark, flags);  in rb_alloc()
787 	return rb;  in rb_alloc()
791 		free_page((unsigned long)rb->data_pages[i]);  in rb_alloc()
793 	free_page((unsigned long)rb->user_page);  in rb_alloc()
796 	kfree(rb);  in rb_alloc()
810 void rb_free(struct ring_buffer *rb)  in rb_free()  argument
814 	perf_mmap_free_page((unsigned long)rb->user_page);  in rb_free()
815 	for (i = 0; i < rb->nr_pages; i++)  in rb_free()
816 		perf_mmap_free_page((unsigned long)rb->data_pages[i]);  in rb_free()
817 	kfree(rb);  in rb_free()
821 static int data_page_nr(struct ring_buffer *rb)  in data_page_nr()  argument
823 	return rb->nr_pages << page_order(rb);  in data_page_nr()
827 __perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)  in __perf_mmap_to_page()  argument
830 	if (pgoff > data_page_nr(rb))  in __perf_mmap_to_page()
833 	return vmalloc_to_page((void *)rb->user_page + pgoff * PAGE_SIZE);  in __perf_mmap_to_page()
845 	struct ring_buffer *rb;  in rb_free_work()  local
849 	rb = container_of(work, struct ring_buffer, work);  in rb_free_work()
850 	nr = data_page_nr(rb);  in rb_free_work()
852 	base = rb->user_page;  in rb_free_work()
858 	kfree(rb);  in rb_free_work()
861 void rb_free(struct ring_buffer *rb)  in rb_free()  argument
863 	schedule_work(&rb->work);  in rb_free()
868 	struct ring_buffer *rb;  in rb_alloc()  local
875 	rb = kzalloc(size, GFP_KERNEL);  in rb_alloc()
876 	if (!rb)  in rb_alloc()
879 	INIT_WORK(&rb->work, rb_free_work);  in rb_alloc()
885 	rb->user_page = all_buf;  in rb_alloc()
886 	rb->data_pages[0] = all_buf + PAGE_SIZE;  in rb_alloc()
888 		rb->nr_pages = 1;  in rb_alloc()
889 		rb->page_order = ilog2(nr_pages);  in rb_alloc()
892 	ring_buffer_init(rb, watermark, flags);  in rb_alloc()
894 	return rb;  in rb_alloc()
897 	kfree(rb);  in rb_alloc()
906 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)  in perf_mmap_to_page()  argument
908 	if (rb->aux_nr_pages) {  in perf_mmap_to_page()
910 		if (pgoff > rb->aux_pgoff + rb->aux_nr_pages)  in perf_mmap_to_page()
914 		if (pgoff >= rb->aux_pgoff) {  in perf_mmap_to_page()
915 			int aux_pgoff = array_index_nospec(pgoff - rb->aux_pgoff, rb->aux_nr_pages);  in perf_mmap_to_page()
916 			return virt_to_page(rb->aux_pages[aux_pgoff]);  in perf_mmap_to_page()
920 	return __perf_mmap_to_page(rb, pgoff);  in perf_mmap_to_page()