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Lines Matching refs:vb

140 	struct virtio_balloon *vb = vq->vdev->priv;  in balloon_ack()  local
142 wake_up(&vb->acked); in balloon_ack()
145 static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq) in tell_host() argument
150 sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns); in tell_host()
155 virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); in tell_host()
159 wait_event(vb->acked, virtqueue_get_buf(vq, &len)); in tell_host()
166 struct virtio_balloon *vb = in virtballoon_free_page_report() local
168 struct virtqueue *vq = vb->reporting_vq; in virtballoon_free_page_report()
172 err = virtqueue_add_inbuf(vq, sg, nents, vb, GFP_NOWAIT | __GFP_NOWARN); in virtballoon_free_page_report()
187 wait_event(vb->acked, virtqueue_get_buf(vq, &unused)); in virtballoon_free_page_report()
192 static void set_page_pfns(struct virtio_balloon *vb, in set_page_pfns() argument
204 pfns[i] = cpu_to_virtio32(vb->vdev, in set_page_pfns()
208 static unsigned int fill_balloon(struct virtio_balloon *vb, size_t num) in fill_balloon() argument
216 num = min(num, ARRAY_SIZE(vb->pfns)); in fill_balloon()
223 dev_info_ratelimited(&vb->vdev->dev, in fill_balloon()
234 mutex_lock(&vb->balloon_lock); in fill_balloon()
236 vb->num_pfns = 0; in fill_balloon()
239 balloon_page_enqueue(&vb->vb_dev_info, page); in fill_balloon()
241 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); in fill_balloon()
242 vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE; in fill_balloon()
243 if (!virtio_has_feature(vb->vdev, in fill_balloon()
246 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE; in fill_balloon()
249 num_allocated_pages = vb->num_pfns; in fill_balloon()
251 if (vb->num_pfns != 0) in fill_balloon()
252 tell_host(vb, vb->inflate_vq); in fill_balloon()
253 mutex_unlock(&vb->balloon_lock); in fill_balloon()
258 static void release_pages_balloon(struct virtio_balloon *vb, in release_pages_balloon() argument
264 if (!virtio_has_feature(vb->vdev, in release_pages_balloon()
272 static unsigned int leak_balloon(struct virtio_balloon *vb, size_t num) in leak_balloon() argument
276 struct balloon_dev_info *vb_dev_info = &vb->vb_dev_info; in leak_balloon()
280 num = min(num, ARRAY_SIZE(vb->pfns)); in leak_balloon()
282 mutex_lock(&vb->balloon_lock); in leak_balloon()
284 num = min(num, (size_t)vb->num_pages); in leak_balloon()
285 for (vb->num_pfns = 0; vb->num_pfns < num; in leak_balloon()
286 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) { in leak_balloon()
290 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); in leak_balloon()
292 vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE; in leak_balloon()
295 num_freed_pages = vb->num_pfns; in leak_balloon()
301 if (vb->num_pfns != 0) in leak_balloon()
302 tell_host(vb, vb->deflate_vq); in leak_balloon()
303 release_pages_balloon(vb, &pages); in leak_balloon()
304 mutex_unlock(&vb->balloon_lock); in leak_balloon()
308 static inline void update_stat(struct virtio_balloon *vb, int idx, in update_stat() argument
312 vb->stats[idx].tag = cpu_to_virtio16(vb->vdev, tag); in update_stat()
313 vb->stats[idx].val = cpu_to_virtio64(vb->vdev, val); in update_stat()
318 static unsigned int update_balloon_stats(struct virtio_balloon *vb) in update_balloon_stats() argument
333 update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_IN, in update_balloon_stats()
335 update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_OUT, in update_balloon_stats()
337 update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]); in update_balloon_stats()
338 update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]); in update_balloon_stats()
340 update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC, in update_balloon_stats()
342 update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL, in update_balloon_stats()
346 update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE, in update_balloon_stats()
348 update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMTOT, in update_balloon_stats()
350 update_stat(vb, idx++, VIRTIO_BALLOON_S_AVAIL, in update_balloon_stats()
352 update_stat(vb, idx++, VIRTIO_BALLOON_S_CACHES, in update_balloon_stats()
369 struct virtio_balloon *vb = vq->vdev->priv; in stats_request() local
371 spin_lock(&vb->stop_update_lock); in stats_request()
372 if (!vb->stop_update) in stats_request()
373 queue_work(system_freezable_wq, &vb->update_balloon_stats_work); in stats_request()
374 spin_unlock(&vb->stop_update_lock); in stats_request()
377 static void stats_handle_request(struct virtio_balloon *vb) in stats_handle_request() argument
383 num_stats = update_balloon_stats(vb); in stats_handle_request()
385 vq = vb->stats_vq; in stats_handle_request()
388 sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats); in stats_handle_request()
389 virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); in stats_handle_request()
393 static inline s64 towards_target(struct virtio_balloon *vb) in towards_target() argument
399 virtio_cread_le(vb->vdev, struct virtio_balloon_config, num_pages, in towards_target()
407 return target - vb->num_pages; in towards_target()
411 static unsigned long return_free_pages_to_mm(struct virtio_balloon *vb, in return_free_pages_to_mm() argument
417 spin_lock_irq(&vb->free_page_list_lock); in return_free_pages_to_mm()
419 page = balloon_page_pop(&vb->free_page_list); in return_free_pages_to_mm()
425 vb->num_free_page_blocks -= num_returned; in return_free_pages_to_mm()
426 spin_unlock_irq(&vb->free_page_list_lock); in return_free_pages_to_mm()
431 static void virtio_balloon_queue_free_page_work(struct virtio_balloon *vb) in virtio_balloon_queue_free_page_work() argument
433 if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtio_balloon_queue_free_page_work()
438 &vb->config_read_bitmap)) in virtio_balloon_queue_free_page_work()
441 queue_work(vb->balloon_wq, &vb->report_free_page_work); in virtio_balloon_queue_free_page_work()
446 struct virtio_balloon *vb = vdev->priv; in virtballoon_changed() local
449 spin_lock_irqsave(&vb->stop_update_lock, flags); in virtballoon_changed()
450 if (!vb->stop_update) { in virtballoon_changed()
452 &vb->update_balloon_size_work); in virtballoon_changed()
453 virtio_balloon_queue_free_page_work(vb); in virtballoon_changed()
455 spin_unlock_irqrestore(&vb->stop_update_lock, flags); in virtballoon_changed()
458 static void update_balloon_size(struct virtio_balloon *vb) in update_balloon_size() argument
460 u32 actual = vb->num_pages; in update_balloon_size()
463 virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, actual, in update_balloon_size()
469 struct virtio_balloon *vb; in update_balloon_stats_func() local
471 vb = container_of(work, struct virtio_balloon, in update_balloon_stats_func()
473 stats_handle_request(vb); in update_balloon_stats_func()
478 struct virtio_balloon *vb; in update_balloon_size_func() local
481 vb = container_of(work, struct virtio_balloon, in update_balloon_size_func()
483 diff = towards_target(vb); in update_balloon_size_func()
489 diff -= fill_balloon(vb, diff); in update_balloon_size_func()
491 diff += leak_balloon(vb, -diff); in update_balloon_size_func()
492 update_balloon_size(vb); in update_balloon_size_func()
498 static int init_vqs(struct virtio_balloon *vb) in init_vqs() argument
520 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { in init_vqs()
525 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { in init_vqs()
530 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in init_vqs()
535 err = virtio_find_vqs(vb->vdev, VIRTIO_BALLOON_VQ_MAX, vqs, in init_vqs()
540 vb->inflate_vq = vqs[VIRTIO_BALLOON_VQ_INFLATE]; in init_vqs()
541 vb->deflate_vq = vqs[VIRTIO_BALLOON_VQ_DEFLATE]; in init_vqs()
542 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { in init_vqs()
545 vb->stats_vq = vqs[VIRTIO_BALLOON_VQ_STATS]; in init_vqs()
551 num_stats = update_balloon_stats(vb); in init_vqs()
553 sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats); in init_vqs()
554 err = virtqueue_add_outbuf(vb->stats_vq, &sg, 1, vb, in init_vqs()
557 dev_warn(&vb->vdev->dev, "%s: add stat_vq failed\n", in init_vqs()
561 virtqueue_kick(vb->stats_vq); in init_vqs()
564 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { in init_vqs()
565 vb->free_page_vq = vqs[VIRTIO_BALLOON_VQ_FREE_PAGE]; in init_vqs()
566 virtqueue_disable_dma_api_for_buffers(vb->free_page_vq); in init_vqs()
569 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in init_vqs()
570 vb->reporting_vq = vqs[VIRTIO_BALLOON_VQ_REPORTING]; in init_vqs()
571 virtqueue_disable_dma_api_for_buffers(vb->reporting_vq); in init_vqs()
577 static u32 virtio_balloon_cmd_id_received(struct virtio_balloon *vb) in virtio_balloon_cmd_id_received() argument
580 &vb->config_read_bitmap)) { in virtio_balloon_cmd_id_received()
582 virtio_cread_le(vb->vdev, struct virtio_balloon_config, in virtio_balloon_cmd_id_received()
584 &vb->cmd_id_received_cache); in virtio_balloon_cmd_id_received()
587 return vb->cmd_id_received_cache; in virtio_balloon_cmd_id_received()
590 static int send_cmd_id_start(struct virtio_balloon *vb) in send_cmd_id_start() argument
593 struct virtqueue *vq = vb->free_page_vq; in send_cmd_id_start()
600 vb->cmd_id_active = cpu_to_virtio32(vb->vdev, in send_cmd_id_start()
601 virtio_balloon_cmd_id_received(vb)); in send_cmd_id_start()
602 sg_init_one(&sg, &vb->cmd_id_active, sizeof(vb->cmd_id_active)); in send_cmd_id_start()
603 err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_active, GFP_KERNEL); in send_cmd_id_start()
609 static int send_cmd_id_stop(struct virtio_balloon *vb) in send_cmd_id_stop() argument
612 struct virtqueue *vq = vb->free_page_vq; in send_cmd_id_stop()
619 sg_init_one(&sg, &vb->cmd_id_stop, sizeof(vb->cmd_id_stop)); in send_cmd_id_stop()
620 err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_stop, GFP_KERNEL); in send_cmd_id_stop()
626 static int get_free_page_and_send(struct virtio_balloon *vb) in get_free_page_and_send() argument
628 struct virtqueue *vq = vb->free_page_vq; in get_free_page_and_send()
658 spin_lock_irq(&vb->free_page_list_lock); in get_free_page_and_send()
659 balloon_page_push(&vb->free_page_list, page); in get_free_page_and_send()
660 vb->num_free_page_blocks++; in get_free_page_and_send()
661 spin_unlock_irq(&vb->free_page_list_lock); in get_free_page_and_send()
673 static int send_free_pages(struct virtio_balloon *vb) in send_free_pages() argument
683 cmd_id_active = virtio32_to_cpu(vb->vdev, vb->cmd_id_active); in send_free_pages()
685 virtio_balloon_cmd_id_received(vb))) in send_free_pages()
692 err = get_free_page_and_send(vb); in send_free_pages()
702 static void virtio_balloon_report_free_page(struct virtio_balloon *vb) in virtio_balloon_report_free_page() argument
705 struct device *dev = &vb->vdev->dev; in virtio_balloon_report_free_page()
708 err = send_cmd_id_start(vb); in virtio_balloon_report_free_page()
712 err = send_free_pages(vb); in virtio_balloon_report_free_page()
717 err = send_cmd_id_stop(vb); in virtio_balloon_report_free_page()
724 struct virtio_balloon *vb = container_of(work, struct virtio_balloon, in report_free_page_func() local
728 cmd_id_received = virtio_balloon_cmd_id_received(vb); in report_free_page_func()
731 return_free_pages_to_mm(vb, ULONG_MAX); in report_free_page_func()
734 virtio32_to_cpu(vb->vdev, vb->cmd_id_active)) { in report_free_page_func()
735 virtio_balloon_report_free_page(vb); in report_free_page_func()
761 struct virtio_balloon *vb = container_of(vb_dev_info, in virtballoon_migratepage() local
773 if (!mutex_trylock(&vb->balloon_lock)) in virtballoon_migratepage()
783 if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM) && in virtballoon_migratepage()
795 vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE; in virtballoon_migratepage()
796 set_page_pfns(vb, vb->pfns, newpage); in virtballoon_migratepage()
797 tell_host(vb, vb->inflate_vq); in virtballoon_migratepage()
803 vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE; in virtballoon_migratepage()
804 set_page_pfns(vb, vb->pfns, page); in virtballoon_migratepage()
805 tell_host(vb, vb->deflate_vq); in virtballoon_migratepage()
807 mutex_unlock(&vb->balloon_lock); in virtballoon_migratepage()
815 static unsigned long shrink_free_pages(struct virtio_balloon *vb, in shrink_free_pages() argument
823 blocks_freed = return_free_pages_to_mm(vb, blocks_to_free); in shrink_free_pages()
831 struct virtio_balloon *vb = container_of(shrinker, in virtio_balloon_shrinker_scan() local
834 return shrink_free_pages(vb, sc->nr_to_scan); in virtio_balloon_shrinker_scan()
840 struct virtio_balloon *vb = container_of(shrinker, in virtio_balloon_shrinker_count() local
843 return vb->num_free_page_blocks * VIRTIO_BALLOON_HINT_BLOCK_PAGES; in virtio_balloon_shrinker_count()
849 struct virtio_balloon *vb = container_of(nb, in virtio_balloon_oom_notify() local
853 *freed += leak_balloon(vb, VIRTIO_BALLOON_OOM_NR_PAGES) / in virtio_balloon_oom_notify()
855 update_balloon_size(vb); in virtio_balloon_oom_notify()
860 static void virtio_balloon_unregister_shrinker(struct virtio_balloon *vb) in virtio_balloon_unregister_shrinker() argument
862 unregister_shrinker(&vb->shrinker); in virtio_balloon_unregister_shrinker()
865 static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) in virtio_balloon_register_shrinker() argument
867 vb->shrinker.scan_objects = virtio_balloon_shrinker_scan; in virtio_balloon_register_shrinker()
868 vb->shrinker.count_objects = virtio_balloon_shrinker_count; in virtio_balloon_register_shrinker()
869 vb->shrinker.seeks = DEFAULT_SEEKS; in virtio_balloon_register_shrinker()
871 return register_shrinker(&vb->shrinker, "virtio-balloon"); in virtio_balloon_register_shrinker()
876 struct virtio_balloon *vb; in virtballoon_probe() local
885 vdev->priv = vb = kzalloc(sizeof(*vb), GFP_KERNEL); in virtballoon_probe()
886 if (!vb) { in virtballoon_probe()
891 INIT_WORK(&vb->update_balloon_stats_work, update_balloon_stats_func); in virtballoon_probe()
892 INIT_WORK(&vb->update_balloon_size_work, update_balloon_size_func); in virtballoon_probe()
893 spin_lock_init(&vb->stop_update_lock); in virtballoon_probe()
894 mutex_init(&vb->balloon_lock); in virtballoon_probe()
895 init_waitqueue_head(&vb->acked); in virtballoon_probe()
896 vb->vdev = vdev; in virtballoon_probe()
898 balloon_devinfo_init(&vb->vb_dev_info); in virtballoon_probe()
900 err = init_vqs(vb); in virtballoon_probe()
905 vb->vb_dev_info.migratepage = virtballoon_migratepage; in virtballoon_probe()
912 if (virtqueue_get_vring_size(vb->free_page_vq) < 2) { in virtballoon_probe()
916 vb->balloon_wq = alloc_workqueue("balloon-wq", in virtballoon_probe()
918 if (!vb->balloon_wq) { in virtballoon_probe()
922 INIT_WORK(&vb->report_free_page_work, report_free_page_func); in virtballoon_probe()
923 vb->cmd_id_received_cache = VIRTIO_BALLOON_CMD_ID_STOP; in virtballoon_probe()
924 vb->cmd_id_active = cpu_to_virtio32(vb->vdev, in virtballoon_probe()
926 vb->cmd_id_stop = cpu_to_virtio32(vb->vdev, in virtballoon_probe()
928 spin_lock_init(&vb->free_page_list_lock); in virtballoon_probe()
929 INIT_LIST_HEAD(&vb->free_page_list); in virtballoon_probe()
934 err = virtio_balloon_register_shrinker(vb); in virtballoon_probe()
939 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) { in virtballoon_probe()
940 vb->oom_nb.notifier_call = virtio_balloon_oom_notify; in virtballoon_probe()
941 vb->oom_nb.priority = VIRTIO_BALLOON_OOM_NOTIFY_PRIORITY; in virtballoon_probe()
942 err = register_oom_notifier(&vb->oom_nb); in virtballoon_probe()
963 virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, in virtballoon_probe()
967 vb->pr_dev_info.report = virtballoon_free_page_report; in virtballoon_probe()
968 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in virtballoon_probe()
971 capacity = virtqueue_get_vring_size(vb->reporting_vq); in virtballoon_probe()
991 vb->pr_dev_info.order = 5; in virtballoon_probe()
994 err = page_reporting_register(&vb->pr_dev_info); in virtballoon_probe()
1001 if (towards_target(vb)) in virtballoon_probe()
1006 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) in virtballoon_probe()
1007 unregister_oom_notifier(&vb->oom_nb); in virtballoon_probe()
1009 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtballoon_probe()
1010 virtio_balloon_unregister_shrinker(vb); in virtballoon_probe()
1013 destroy_workqueue(vb->balloon_wq); in virtballoon_probe()
1017 kfree(vb); in virtballoon_probe()
1022 static void remove_common(struct virtio_balloon *vb) in remove_common() argument
1025 while (vb->num_pages) in remove_common()
1026 leak_balloon(vb, vb->num_pages); in remove_common()
1027 update_balloon_size(vb); in remove_common()
1030 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in remove_common()
1031 return_free_pages_to_mm(vb, ULONG_MAX); in remove_common()
1034 virtio_reset_device(vb->vdev); in remove_common()
1036 vb->vdev->config->del_vqs(vb->vdev); in remove_common()
1041 struct virtio_balloon *vb = vdev->priv; in virtballoon_remove() local
1043 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) in virtballoon_remove()
1044 page_reporting_unregister(&vb->pr_dev_info); in virtballoon_remove()
1045 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) in virtballoon_remove()
1046 unregister_oom_notifier(&vb->oom_nb); in virtballoon_remove()
1047 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtballoon_remove()
1048 virtio_balloon_unregister_shrinker(vb); in virtballoon_remove()
1049 spin_lock_irq(&vb->stop_update_lock); in virtballoon_remove()
1050 vb->stop_update = true; in virtballoon_remove()
1051 spin_unlock_irq(&vb->stop_update_lock); in virtballoon_remove()
1052 cancel_work_sync(&vb->update_balloon_size_work); in virtballoon_remove()
1053 cancel_work_sync(&vb->update_balloon_stats_work); in virtballoon_remove()
1056 cancel_work_sync(&vb->report_free_page_work); in virtballoon_remove()
1057 destroy_workqueue(vb->balloon_wq); in virtballoon_remove()
1060 remove_common(vb); in virtballoon_remove()
1061 kfree(vb); in virtballoon_remove()
1067 struct virtio_balloon *vb = vdev->priv; in virtballoon_freeze() local
1073 remove_common(vb); in virtballoon_freeze()
1079 struct virtio_balloon *vb = vdev->priv; in virtballoon_restore() local
1088 if (towards_target(vb)) in virtballoon_restore()
1090 update_balloon_size(vb); in virtballoon_restore()