Lines Matching full:vb
147 struct virtio_balloon *vb = vq->vdev->priv; in balloon_ack() local
149 wake_up(&vb->acked); in balloon_ack()
152 static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq) in tell_host() argument
157 sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns); in tell_host()
160 virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); in tell_host()
164 wait_event(vb->acked, virtqueue_get_buf(vq, &len)); in tell_host()
171 struct virtio_balloon *vb = in virtballoon_free_page_report() local
173 struct virtqueue *vq = vb->reporting_vq; in virtballoon_free_page_report()
177 err = virtqueue_add_inbuf(vq, sg, nents, vb, GFP_NOWAIT | __GFP_NOWARN); in virtballoon_free_page_report()
190 wait_event(vb->acked, virtqueue_get_buf(vq, &unused)); in virtballoon_free_page_report()
195 static void set_page_pfns(struct virtio_balloon *vb, in set_page_pfns() argument
207 pfns[i] = cpu_to_virtio32(vb->vdev, in set_page_pfns()
211 static unsigned fill_balloon(struct virtio_balloon *vb, size_t num) in fill_balloon() argument
219 num = min(num, ARRAY_SIZE(vb->pfns)); in fill_balloon()
226 dev_info_ratelimited(&vb->vdev->dev, in fill_balloon()
237 mutex_lock(&vb->balloon_lock); in fill_balloon()
239 vb->num_pfns = 0; in fill_balloon()
242 balloon_page_enqueue(&vb->vb_dev_info, page); in fill_balloon()
244 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); in fill_balloon()
245 vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE; in fill_balloon()
246 if (!virtio_has_feature(vb->vdev, in fill_balloon()
249 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE; in fill_balloon()
252 num_allocated_pages = vb->num_pfns; in fill_balloon()
254 if (vb->num_pfns != 0) in fill_balloon()
255 tell_host(vb, vb->inflate_vq); in fill_balloon()
256 mutex_unlock(&vb->balloon_lock); in fill_balloon()
261 static void release_pages_balloon(struct virtio_balloon *vb, in release_pages_balloon() argument
267 if (!virtio_has_feature(vb->vdev, in release_pages_balloon()
275 static unsigned leak_balloon(struct virtio_balloon *vb, size_t num) in leak_balloon() argument
279 struct balloon_dev_info *vb_dev_info = &vb->vb_dev_info; in leak_balloon()
283 num = min(num, ARRAY_SIZE(vb->pfns)); in leak_balloon()
285 mutex_lock(&vb->balloon_lock); in leak_balloon()
287 num = min(num, (size_t)vb->num_pages); in leak_balloon()
288 for (vb->num_pfns = 0; vb->num_pfns < num; in leak_balloon()
289 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) { in leak_balloon()
293 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); in leak_balloon()
295 vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE; in leak_balloon()
298 num_freed_pages = vb->num_pfns; in leak_balloon()
304 if (vb->num_pfns != 0) in leak_balloon()
305 tell_host(vb, vb->deflate_vq); in leak_balloon()
306 release_pages_balloon(vb, &pages); in leak_balloon()
307 mutex_unlock(&vb->balloon_lock); in leak_balloon()
311 static inline void update_stat(struct virtio_balloon *vb, int idx, in update_stat() argument
315 vb->stats[idx].tag = cpu_to_virtio16(vb->vdev, tag); in update_stat()
316 vb->stats[idx].val = cpu_to_virtio64(vb->vdev, val); in update_stat()
321 static unsigned int update_balloon_stats(struct virtio_balloon *vb) in update_balloon_stats() argument
336 update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_IN, in update_balloon_stats()
338 update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_OUT, in update_balloon_stats()
340 update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]); in update_balloon_stats()
341 update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]); in update_balloon_stats()
343 update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC, in update_balloon_stats()
345 update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL, in update_balloon_stats()
349 update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE, in update_balloon_stats()
351 update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMTOT, in update_balloon_stats()
353 update_stat(vb, idx++, VIRTIO_BALLOON_S_AVAIL, in update_balloon_stats()
355 update_stat(vb, idx++, VIRTIO_BALLOON_S_CACHES, in update_balloon_stats()
372 struct virtio_balloon *vb = vq->vdev->priv; in stats_request() local
374 spin_lock(&vb->stop_update_lock); in stats_request()
375 if (!vb->stop_update) in stats_request()
376 queue_work(system_freezable_wq, &vb->update_balloon_stats_work); in stats_request()
377 spin_unlock(&vb->stop_update_lock); in stats_request()
380 static void stats_handle_request(struct virtio_balloon *vb) in stats_handle_request() argument
386 num_stats = update_balloon_stats(vb); in stats_handle_request()
388 vq = vb->stats_vq; in stats_handle_request()
391 sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats); in stats_handle_request()
392 virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); in stats_handle_request()
396 static inline s64 towards_target(struct virtio_balloon *vb) in towards_target() argument
402 virtio_cread_le(vb->vdev, struct virtio_balloon_config, num_pages, in towards_target()
410 return target - vb->num_pages; in towards_target()
414 static unsigned long return_free_pages_to_mm(struct virtio_balloon *vb, in return_free_pages_to_mm() argument
420 spin_lock_irq(&vb->free_page_list_lock); in return_free_pages_to_mm()
422 page = balloon_page_pop(&vb->free_page_list); in return_free_pages_to_mm()
428 vb->num_free_page_blocks -= num_returned; in return_free_pages_to_mm()
429 spin_unlock_irq(&vb->free_page_list_lock); in return_free_pages_to_mm()
434 static void virtio_balloon_queue_free_page_work(struct virtio_balloon *vb) in virtio_balloon_queue_free_page_work() argument
436 if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtio_balloon_queue_free_page_work()
441 &vb->config_read_bitmap)) in virtio_balloon_queue_free_page_work()
444 queue_work(vb->balloon_wq, &vb->report_free_page_work); in virtio_balloon_queue_free_page_work()
449 struct virtio_balloon *vb = vdev->priv; in virtballoon_changed() local
452 spin_lock_irqsave(&vb->stop_update_lock, flags); in virtballoon_changed()
453 if (!vb->stop_update) { in virtballoon_changed()
455 &vb->update_balloon_size_work); in virtballoon_changed()
456 virtio_balloon_queue_free_page_work(vb); in virtballoon_changed()
458 spin_unlock_irqrestore(&vb->stop_update_lock, flags); in virtballoon_changed()
461 static void update_balloon_size(struct virtio_balloon *vb) in update_balloon_size() argument
463 u32 actual = vb->num_pages; in update_balloon_size()
466 virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, actual, in update_balloon_size()
472 struct virtio_balloon *vb; in update_balloon_stats_func() local
474 vb = container_of(work, struct virtio_balloon, in update_balloon_stats_func()
476 stats_handle_request(vb); in update_balloon_stats_func()
481 struct virtio_balloon *vb; in update_balloon_size_func() local
484 vb = container_of(work, struct virtio_balloon, in update_balloon_size_func()
486 diff = towards_target(vb); in update_balloon_size_func()
492 diff -= fill_balloon(vb, diff); in update_balloon_size_func()
494 diff += leak_balloon(vb, -diff); in update_balloon_size_func()
495 update_balloon_size(vb); in update_balloon_size_func()
501 static int init_vqs(struct virtio_balloon *vb) in init_vqs() argument
523 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { in init_vqs()
528 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { in init_vqs()
533 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in init_vqs()
538 err = vb->vdev->config->find_vqs(vb->vdev, VIRTIO_BALLOON_VQ_MAX, in init_vqs()
543 vb->inflate_vq = vqs[VIRTIO_BALLOON_VQ_INFLATE]; in init_vqs()
544 vb->deflate_vq = vqs[VIRTIO_BALLOON_VQ_DEFLATE]; in init_vqs()
545 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { in init_vqs()
548 vb->stats_vq = vqs[VIRTIO_BALLOON_VQ_STATS]; in init_vqs()
554 num_stats = update_balloon_stats(vb); in init_vqs()
556 sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats); in init_vqs()
557 err = virtqueue_add_outbuf(vb->stats_vq, &sg, 1, vb, in init_vqs()
560 dev_warn(&vb->vdev->dev, "%s: add stat_vq failed\n", in init_vqs()
564 virtqueue_kick(vb->stats_vq); in init_vqs()
567 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in init_vqs()
568 vb->free_page_vq = vqs[VIRTIO_BALLOON_VQ_FREE_PAGE]; in init_vqs()
570 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) in init_vqs()
571 vb->reporting_vq = vqs[VIRTIO_BALLOON_VQ_REPORTING]; in init_vqs()
576 static u32 virtio_balloon_cmd_id_received(struct virtio_balloon *vb) in virtio_balloon_cmd_id_received() argument
579 &vb->config_read_bitmap)) { in virtio_balloon_cmd_id_received()
581 virtio_cread_le(vb->vdev, struct virtio_balloon_config, in virtio_balloon_cmd_id_received()
583 &vb->cmd_id_received_cache); in virtio_balloon_cmd_id_received()
586 return vb->cmd_id_received_cache; in virtio_balloon_cmd_id_received()
589 static int send_cmd_id_start(struct virtio_balloon *vb) in send_cmd_id_start() argument
592 struct virtqueue *vq = vb->free_page_vq; in send_cmd_id_start()
599 vb->cmd_id_active = cpu_to_virtio32(vb->vdev, in send_cmd_id_start()
600 virtio_balloon_cmd_id_received(vb)); in send_cmd_id_start()
601 sg_init_one(&sg, &vb->cmd_id_active, sizeof(vb->cmd_id_active)); in send_cmd_id_start()
602 err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_active, GFP_KERNEL); in send_cmd_id_start()
608 static int send_cmd_id_stop(struct virtio_balloon *vb) in send_cmd_id_stop() argument
611 struct virtqueue *vq = vb->free_page_vq; in send_cmd_id_stop()
618 sg_init_one(&sg, &vb->cmd_id_stop, sizeof(vb->cmd_id_stop)); in send_cmd_id_stop()
619 err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_stop, GFP_KERNEL); in send_cmd_id_stop()
625 static int get_free_page_and_send(struct virtio_balloon *vb) in get_free_page_and_send() argument
627 struct virtqueue *vq = vb->free_page_vq; in get_free_page_and_send()
657 spin_lock_irq(&vb->free_page_list_lock); in get_free_page_and_send()
658 balloon_page_push(&vb->free_page_list, page); in get_free_page_and_send()
659 vb->num_free_page_blocks++; in get_free_page_and_send()
660 spin_unlock_irq(&vb->free_page_list_lock); in get_free_page_and_send()
672 static int send_free_pages(struct virtio_balloon *vb) in send_free_pages() argument
682 cmd_id_active = virtio32_to_cpu(vb->vdev, vb->cmd_id_active); in send_free_pages()
684 virtio_balloon_cmd_id_received(vb))) in send_free_pages()
691 err = get_free_page_and_send(vb); in send_free_pages()
701 static void virtio_balloon_report_free_page(struct virtio_balloon *vb) in virtio_balloon_report_free_page() argument
704 struct device *dev = &vb->vdev->dev; in virtio_balloon_report_free_page()
707 err = send_cmd_id_start(vb); in virtio_balloon_report_free_page()
711 err = send_free_pages(vb); in virtio_balloon_report_free_page()
716 err = send_cmd_id_stop(vb); in virtio_balloon_report_free_page()
723 struct virtio_balloon *vb = container_of(work, struct virtio_balloon, in report_free_page_func() local
727 cmd_id_received = virtio_balloon_cmd_id_received(vb); in report_free_page_func()
730 return_free_pages_to_mm(vb, ULONG_MAX); in report_free_page_func()
733 virtio32_to_cpu(vb->vdev, vb->cmd_id_active)) { in report_free_page_func()
734 virtio_balloon_report_free_page(vb); in report_free_page_func()
751 * 1) insert newpage into vb->pages list and update the host about it;
752 * 2) update the host about the old page removed from vb->pages list;
760 struct virtio_balloon *vb = container_of(vb_dev_info, in virtballoon_migratepage() local
772 if (!mutex_trylock(&vb->balloon_lock)) in virtballoon_migratepage()
782 if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM) && in virtballoon_migratepage()
794 vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE; in virtballoon_migratepage()
795 set_page_pfns(vb, vb->pfns, newpage); in virtballoon_migratepage()
796 tell_host(vb, vb->inflate_vq); in virtballoon_migratepage()
802 vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE; in virtballoon_migratepage()
803 set_page_pfns(vb, vb->pfns, page); in virtballoon_migratepage()
804 tell_host(vb, vb->deflate_vq); in virtballoon_migratepage()
806 mutex_unlock(&vb->balloon_lock); in virtballoon_migratepage()
826 static unsigned long shrink_free_pages(struct virtio_balloon *vb, in shrink_free_pages() argument
834 blocks_freed = return_free_pages_to_mm(vb, blocks_to_free); in shrink_free_pages()
842 struct virtio_balloon *vb = container_of(shrinker, in virtio_balloon_shrinker_scan() local
845 return shrink_free_pages(vb, sc->nr_to_scan); in virtio_balloon_shrinker_scan()
851 struct virtio_balloon *vb = container_of(shrinker, in virtio_balloon_shrinker_count() local
854 return vb->num_free_page_blocks * VIRTIO_BALLOON_HINT_BLOCK_PAGES; in virtio_balloon_shrinker_count()
860 struct virtio_balloon *vb = container_of(nb, in virtio_balloon_oom_notify() local
864 *freed += leak_balloon(vb, VIRTIO_BALLOON_OOM_NR_PAGES) / in virtio_balloon_oom_notify()
866 update_balloon_size(vb); in virtio_balloon_oom_notify()
871 static void virtio_balloon_unregister_shrinker(struct virtio_balloon *vb) in virtio_balloon_unregister_shrinker() argument
873 unregister_shrinker(&vb->shrinker); in virtio_balloon_unregister_shrinker()
876 static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) in virtio_balloon_register_shrinker() argument
878 vb->shrinker.scan_objects = virtio_balloon_shrinker_scan; in virtio_balloon_register_shrinker()
879 vb->shrinker.count_objects = virtio_balloon_shrinker_count; in virtio_balloon_register_shrinker()
880 vb->shrinker.seeks = DEFAULT_SEEKS; in virtio_balloon_register_shrinker()
882 return register_shrinker(&vb->shrinker); in virtio_balloon_register_shrinker()
887 struct virtio_balloon *vb; in virtballoon_probe() local
896 vdev->priv = vb = kzalloc(sizeof(*vb), GFP_KERNEL); in virtballoon_probe()
897 if (!vb) { in virtballoon_probe()
902 INIT_WORK(&vb->update_balloon_stats_work, update_balloon_stats_func); in virtballoon_probe()
903 INIT_WORK(&vb->update_balloon_size_work, update_balloon_size_func); in virtballoon_probe()
904 spin_lock_init(&vb->stop_update_lock); in virtballoon_probe()
905 mutex_init(&vb->balloon_lock); in virtballoon_probe()
906 init_waitqueue_head(&vb->acked); in virtballoon_probe()
907 vb->vdev = vdev; in virtballoon_probe()
909 balloon_devinfo_init(&vb->vb_dev_info); in virtballoon_probe()
911 err = init_vqs(vb); in virtballoon_probe()
922 vb->vb_dev_info.migratepage = virtballoon_migratepage; in virtballoon_probe()
923 vb->vb_dev_info.inode = alloc_anon_inode(balloon_mnt->mnt_sb); in virtballoon_probe()
924 if (IS_ERR(vb->vb_dev_info.inode)) { in virtballoon_probe()
925 err = PTR_ERR(vb->vb_dev_info.inode); in virtballoon_probe()
928 vb->vb_dev_info.inode->i_mapping->a_ops = &balloon_aops; in virtballoon_probe()
935 if (virtqueue_get_vring_size(vb->free_page_vq) < 2) { in virtballoon_probe()
939 vb->balloon_wq = alloc_workqueue("balloon-wq", in virtballoon_probe()
941 if (!vb->balloon_wq) { in virtballoon_probe()
945 INIT_WORK(&vb->report_free_page_work, report_free_page_func); in virtballoon_probe()
946 vb->cmd_id_received_cache = VIRTIO_BALLOON_CMD_ID_STOP; in virtballoon_probe()
947 vb->cmd_id_active = cpu_to_virtio32(vb->vdev, in virtballoon_probe()
949 vb->cmd_id_stop = cpu_to_virtio32(vb->vdev, in virtballoon_probe()
951 spin_lock_init(&vb->free_page_list_lock); in virtballoon_probe()
952 INIT_LIST_HEAD(&vb->free_page_list); in virtballoon_probe()
957 err = virtio_balloon_register_shrinker(vb); in virtballoon_probe()
962 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) { in virtballoon_probe()
963 vb->oom_nb.notifier_call = virtio_balloon_oom_notify; in virtballoon_probe()
964 vb->oom_nb.priority = VIRTIO_BALLOON_OOM_NOTIFY_PRIORITY; in virtballoon_probe()
965 err = register_oom_notifier(&vb->oom_nb); in virtballoon_probe()
986 virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, in virtballoon_probe()
990 vb->pr_dev_info.report = virtballoon_free_page_report; in virtballoon_probe()
991 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in virtballoon_probe()
994 capacity = virtqueue_get_vring_size(vb->reporting_vq); in virtballoon_probe()
1000 err = page_reporting_register(&vb->pr_dev_info); in virtballoon_probe()
1007 if (towards_target(vb)) in virtballoon_probe()
1012 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) in virtballoon_probe()
1013 unregister_oom_notifier(&vb->oom_nb); in virtballoon_probe()
1015 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtballoon_probe()
1016 virtio_balloon_unregister_shrinker(vb); in virtballoon_probe()
1019 destroy_workqueue(vb->balloon_wq); in virtballoon_probe()
1022 iput(vb->vb_dev_info.inode); in virtballoon_probe()
1029 kfree(vb); in virtballoon_probe()
1034 static void remove_common(struct virtio_balloon *vb) in remove_common() argument
1037 while (vb->num_pages) in remove_common()
1038 leak_balloon(vb, vb->num_pages); in remove_common()
1039 update_balloon_size(vb); in remove_common()
1042 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in remove_common()
1043 return_free_pages_to_mm(vb, ULONG_MAX); in remove_common()
1046 vb->vdev->config->reset(vb->vdev); in remove_common()
1048 vb->vdev->config->del_vqs(vb->vdev); in remove_common()
1053 struct virtio_balloon *vb = vdev->priv; in virtballoon_remove() local
1055 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) in virtballoon_remove()
1056 page_reporting_unregister(&vb->pr_dev_info); in virtballoon_remove()
1057 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) in virtballoon_remove()
1058 unregister_oom_notifier(&vb->oom_nb); in virtballoon_remove()
1059 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtballoon_remove()
1060 virtio_balloon_unregister_shrinker(vb); in virtballoon_remove()
1061 spin_lock_irq(&vb->stop_update_lock); in virtballoon_remove()
1062 vb->stop_update = true; in virtballoon_remove()
1063 spin_unlock_irq(&vb->stop_update_lock); in virtballoon_remove()
1064 cancel_work_sync(&vb->update_balloon_size_work); in virtballoon_remove()
1065 cancel_work_sync(&vb->update_balloon_stats_work); in virtballoon_remove()
1068 cancel_work_sync(&vb->report_free_page_work); in virtballoon_remove()
1069 destroy_workqueue(vb->balloon_wq); in virtballoon_remove()
1072 remove_common(vb); in virtballoon_remove()
1074 if (vb->vb_dev_info.inode) in virtballoon_remove()
1075 iput(vb->vb_dev_info.inode); in virtballoon_remove()
1079 kfree(vb); in virtballoon_remove()
1085 struct virtio_balloon *vb = vdev->priv; in virtballoon_freeze() local
1091 remove_common(vb); in virtballoon_freeze()
1097 struct virtio_balloon *vb = vdev->priv; in virtballoon_restore() local
1106 if (towards_target(vb)) in virtballoon_restore()
1108 update_balloon_size(vb); in virtballoon_restore()