23 	atomic_set(&handle->rb->poll, EPOLLIN);  in perf_output_wakeup()
39 	struct ring_buffer *rb = handle->rb;  in perf_output_get_handle()  local
42 	local_inc(&rb->nest);  in perf_output_get_handle()
43 	handle->wakeup = local_read(&rb->wakeup);  in perf_output_get_handle()
48 	struct ring_buffer *rb = handle->rb;  in perf_output_put_handle()  local
52 	head = local_read(&rb->head);  in perf_output_put_handle()
58 	if (!local_dec_and_test(&rb->nest))  in perf_output_put_handle()
88 	rb->user_page->data_head = head;  in perf_output_put_handle()
94 	if (unlikely(head != local_read(&rb->head))) {  in perf_output_put_handle()
95 		local_inc(&rb->nest);  in perf_output_put_handle()
99 	if (handle->wakeup != local_read(&rb->wakeup))  in perf_output_put_handle()
122 	struct ring_buffer *rb;  in __perf_output_begin()  local
138 	rb = rcu_dereference(event->rb);  in __perf_output_begin()
139 	if (unlikely(!rb))  in __perf_output_begin()
142 	if (unlikely(rb->paused)) {  in __perf_output_begin()
143 		if (rb->nr_pages)  in __perf_output_begin()
144 			local_inc(&rb->lost);  in __perf_output_begin()
148 	handle->rb    = rb;  in __perf_output_begin()
151 	have_lost = local_read(&rb->lost);  in __perf_output_begin()
161 		tail = READ_ONCE(rb->user_page->data_tail);  in __perf_output_begin()
162 		offset = head = local_read(&rb->head);  in __perf_output_begin()
163 		if (!rb->overwrite) {  in __perf_output_begin()
165 							    perf_data_size(rb),  in __perf_output_begin()
186 	} while (local_cmpxchg(&rb->head, offset, head) != offset);  in __perf_output_begin()
198 	if (unlikely(head - local_read(&rb->wakeup) > rb->watermark))  in __perf_output_begin()
199 		local_add(rb->watermark, &rb->wakeup);  in __perf_output_begin()
201 	page_shift = PAGE_SHIFT + page_order(rb);  in __perf_output_begin()
203 	handle->page = (offset >> page_shift) & (rb->nr_pages - 1);  in __perf_output_begin()
205 	handle->addr = rb->data_pages[handle->page] + offset;  in __perf_output_begin()
215 		lost_event.lost        = local_xchg(&rb->lost, 0);  in __perf_output_begin()
226 	local_inc(&rb->lost);  in __perf_output_begin()
273 ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)  in ring_buffer_init()  argument
275 	long max_size = perf_data_size(rb);  in ring_buffer_init()
278 		rb->watermark = min(max_size, watermark);  in ring_buffer_init()
280 	if (!rb->watermark)  in ring_buffer_init()
281 		rb->watermark = max_size / 2;  in ring_buffer_init()
284 		rb->overwrite = 0;  in ring_buffer_init()
286 		rb->overwrite = 1;  in ring_buffer_init()
288 	atomic_set(&rb->refcount, 1);  in ring_buffer_init()
290 	INIT_LIST_HEAD(&rb->event_list);  in ring_buffer_init()
291 	spin_lock_init(&rb->event_lock);  in ring_buffer_init()
297 	if (!rb->nr_pages)  in ring_buffer_init()
298 		rb->paused = 1;  in ring_buffer_init()
333 	struct ring_buffer *rb;  in perf_aux_output_begin()  local
343 	rb = ring_buffer_get(output_event);  in perf_aux_output_begin()
344 	if (!rb)  in perf_aux_output_begin()
347 	if (!rb_has_aux(rb))  in perf_aux_output_begin()
358 	if (!atomic_read(&rb->aux_mmap_count))  in perf_aux_output_begin()
361 	if (!atomic_inc_not_zero(&rb->aux_refcount))  in perf_aux_output_begin()
368 	if (WARN_ON_ONCE(local_xchg(&rb->aux_nest, 1)))  in perf_aux_output_begin()
371 	aux_head = rb->aux_head;  in perf_aux_output_begin()
373 	handle->rb = rb;  in perf_aux_output_begin()
384 	if (!rb->aux_overwrite) {  in perf_aux_output_begin()
385 		aux_tail = READ_ONCE(rb->user_page->aux_tail);  in perf_aux_output_begin()
386 		handle->wakeup = rb->aux_wakeup + rb->aux_watermark;  in perf_aux_output_begin()
387 		if (aux_head - aux_tail < perf_aux_size(rb))  in perf_aux_output_begin()
388 			handle->size = CIRC_SPACE(aux_head, aux_tail, perf_aux_size(rb));  in perf_aux_output_begin()
398 			local_set(&rb->aux_nest, 0);  in perf_aux_output_begin()
403 	return handle->rb->aux_priv;  in perf_aux_output_begin()
407 	rb_free_aux(rb);  in perf_aux_output_begin()
410 	ring_buffer_put(rb);  in perf_aux_output_begin()
417 static __always_inline bool rb_need_aux_wakeup(struct ring_buffer *rb)  in rb_need_aux_wakeup()  argument
419 	if (rb->aux_overwrite)  in rb_need_aux_wakeup()
422 	if (rb->aux_head - rb->aux_wakeup >= rb->aux_watermark) {  in rb_need_aux_wakeup()
423 		rb->aux_wakeup = rounddown(rb->aux_head, rb->aux_watermark);  in rb_need_aux_wakeup()
443 	struct ring_buffer *rb = handle->rb;  in perf_aux_output_end()  local
447 	if (rb->aux_overwrite) {  in perf_aux_output_end()
451 		rb->aux_head = aux_head;  in perf_aux_output_end()
455 		aux_head = rb->aux_head;  in perf_aux_output_end()
456 		rb->aux_head += size;  in perf_aux_output_end()
468 	rb->user_page->aux_head = rb->aux_head;  in perf_aux_output_end()
469 	if (rb_need_aux_wakeup(rb))  in perf_aux_output_end()
480 	local_set(&rb->aux_nest, 0);  in perf_aux_output_end()
482 	rb_free_aux(rb);  in perf_aux_output_end()
483 	ring_buffer_put(rb);  in perf_aux_output_end()
493 	struct ring_buffer *rb = handle->rb;  in perf_aux_output_skip()  local
498 	rb->aux_head += size;  in perf_aux_output_skip()
500 	rb->user_page->aux_head = rb->aux_head;  in perf_aux_output_skip()
501 	if (rb_need_aux_wakeup(rb)) {  in perf_aux_output_skip()
503 		handle->wakeup = rb->aux_wakeup + rb->aux_watermark;  in perf_aux_output_skip()
506 	handle->head = rb->aux_head;  in perf_aux_output_skip()
519 	return handle->rb->aux_priv;  in perf_get_aux()
551 static void rb_free_aux_page(struct ring_buffer *rb, int idx)  in rb_free_aux_page()  argument
553 	struct page *page = virt_to_page(rb->aux_pages[idx]);  in rb_free_aux_page()
560 static void __rb_free_aux(struct ring_buffer *rb)  in __rb_free_aux()  argument
572 	if (rb->aux_priv) {  in __rb_free_aux()
573 		rb->free_aux(rb->aux_priv);  in __rb_free_aux()
574 		rb->free_aux = NULL;  in __rb_free_aux()
575 		rb->aux_priv = NULL;  in __rb_free_aux()
578 	if (rb->aux_nr_pages) {  in __rb_free_aux()
579 		for (pg = 0; pg < rb->aux_nr_pages; pg++)  in __rb_free_aux()
580 			rb_free_aux_page(rb, pg);  in __rb_free_aux()
582 		kfree(rb->aux_pages);  in __rb_free_aux()
583 		rb->aux_nr_pages = 0;  in __rb_free_aux()
587 int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event,  in rb_alloc_aux()  argument
617 	rb->aux_pages = kcalloc_node(nr_pages, sizeof(void *), GFP_KERNEL,  in rb_alloc_aux()
619 	if (!rb->aux_pages)  in rb_alloc_aux()
622 	rb->free_aux = event->pmu->free_aux;  in rb_alloc_aux()
623 	for (rb->aux_nr_pages = 0; rb->aux_nr_pages < nr_pages;) {  in rb_alloc_aux()
627 		order = min(max_order, ilog2(nr_pages - rb->aux_nr_pages));  in rb_alloc_aux()
632 		for (last = rb->aux_nr_pages + (1 << page_private(page));  in rb_alloc_aux()
633 		     last > rb->aux_nr_pages; rb->aux_nr_pages++)  in rb_alloc_aux()
634 			rb->aux_pages[rb->aux_nr_pages] = page_address(page++);  in rb_alloc_aux()
645 		struct page *page = virt_to_page(rb->aux_pages[0]);  in rb_alloc_aux()
651 	rb->aux_priv = event->pmu->setup_aux(event->cpu, rb->aux_pages, nr_pages,  in rb_alloc_aux()
653 	if (!rb->aux_priv)  in rb_alloc_aux()
664 	atomic_set(&rb->aux_refcount, 1);  in rb_alloc_aux()
666 	rb->aux_overwrite = overwrite;  in rb_alloc_aux()
667 	rb->aux_watermark = watermark;  in rb_alloc_aux()
669 	if (!rb->aux_watermark && !rb->aux_overwrite)  in rb_alloc_aux()
670 		rb->aux_watermark = nr_pages << (PAGE_SHIFT - 1);  in rb_alloc_aux()
674 		rb->aux_pgoff = pgoff;  in rb_alloc_aux()
676 		__rb_free_aux(rb);  in rb_alloc_aux()
681 void rb_free_aux(struct ring_buffer *rb)  in rb_free_aux()  argument
683 	if (atomic_dec_and_test(&rb->aux_refcount))  in rb_free_aux()
684 		__rb_free_aux(rb);  in rb_free_aux()
694 __perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)  in __perf_mmap_to_page()  argument
696 	if (pgoff > rb->nr_pages)  in __perf_mmap_to_page()
700 		return virt_to_page(rb->user_page);  in __perf_mmap_to_page()
702 	return virt_to_page(rb->data_pages[pgoff - 1]);  in __perf_mmap_to_page()
720 	struct ring_buffer *rb;  in rb_alloc()  local
727 	rb = kzalloc(size, GFP_KERNEL);  in rb_alloc()
728 	if (!rb)  in rb_alloc()
731 	rb->user_page = perf_mmap_alloc_page(cpu);  in rb_alloc()
732 	if (!rb->user_page)  in rb_alloc()
736 		rb->data_pages[i] = perf_mmap_alloc_page(cpu);  in rb_alloc()
737 		if (!rb->data_pages[i])  in rb_alloc()
741 	rb->nr_pages = nr_pages;  in rb_alloc()
743 	ring_buffer_init(rb, watermark, flags);  in rb_alloc()
745 	return rb;  in rb_alloc()
749 		free_page((unsigned long)rb->data_pages[i]);  in rb_alloc()
751 	free_page((unsigned long)rb->user_page);  in rb_alloc()
754 	kfree(rb);  in rb_alloc()
768 void rb_free(struct ring_buffer *rb)  in rb_free()  argument
772 	perf_mmap_free_page((unsigned long)rb->user_page);  in rb_free()
773 	for (i = 0; i < rb->nr_pages; i++)  in rb_free()
774 		perf_mmap_free_page((unsigned long)rb->data_pages[i]);  in rb_free()
775 	kfree(rb);  in rb_free()
779 static int data_page_nr(struct ring_buffer *rb)  in data_page_nr()  argument
781 	return rb->nr_pages << page_order(rb);  in data_page_nr()
785 __perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)  in __perf_mmap_to_page()  argument
788 	if (pgoff > data_page_nr(rb))  in __perf_mmap_to_page()
791 	return vmalloc_to_page((void *)rb->user_page + pgoff * PAGE_SIZE);  in __perf_mmap_to_page()
803 	struct ring_buffer *rb;  in rb_free_work()  local
807 	rb = container_of(work, struct ring_buffer, work);  in rb_free_work()
808 	nr = data_page_nr(rb);  in rb_free_work()
810 	base = rb->user_page;  in rb_free_work()
816 	kfree(rb);  in rb_free_work()
819 void rb_free(struct ring_buffer *rb)  in rb_free()  argument
821 	schedule_work(&rb->work);  in rb_free()
826 	struct ring_buffer *rb;  in rb_alloc()  local
833 	rb = kzalloc(size, GFP_KERNEL);  in rb_alloc()
834 	if (!rb)  in rb_alloc()
837 	INIT_WORK(&rb->work, rb_free_work);  in rb_alloc()
843 	rb->user_page = all_buf;  in rb_alloc()
844 	rb->data_pages[0] = all_buf + PAGE_SIZE;  in rb_alloc()
846 		rb->nr_pages = 1;  in rb_alloc()
847 		rb->page_order = ilog2(nr_pages);  in rb_alloc()
850 	ring_buffer_init(rb, watermark, flags);  in rb_alloc()
852 	return rb;  in rb_alloc()
855 	kfree(rb);  in rb_alloc()
864 perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff)  in perf_mmap_to_page()  argument
866 	if (rb->aux_nr_pages) {  in perf_mmap_to_page()
868 		if (pgoff > rb->aux_pgoff + rb->aux_nr_pages)  in perf_mmap_to_page()
872 		if (pgoff >= rb->aux_pgoff) {  in perf_mmap_to_page()
873 			int aux_pgoff = array_index_nospec(pgoff - rb->aux_pgoff, rb->aux_nr_pages);  in perf_mmap_to_page()
874 			return virt_to_page(rb->aux_pages[aux_pgoff]);  in perf_mmap_to_page()
878 	return __perf_mmap_to_page(rb, pgoff);  in perf_mmap_to_page()