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()
153 virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); in tell_host()
157 wait_event(vb->acked, virtqueue_get_buf(vq, &len)); in tell_host()
164 struct virtio_balloon *vb = in virtballoon_free_page_report() local
166 struct virtqueue *vq = vb->reporting_vq; in virtballoon_free_page_report()
170 err = virtqueue_add_inbuf(vq, sg, nents, vb, GFP_NOWAIT | __GFP_NOWARN); in virtballoon_free_page_report()
183 wait_event(vb->acked, virtqueue_get_buf(vq, &unused)); in virtballoon_free_page_report()
188 static void set_page_pfns(struct virtio_balloon *vb, in set_page_pfns() argument
200 pfns[i] = cpu_to_virtio32(vb->vdev, in set_page_pfns()
204 static unsigned int fill_balloon(struct virtio_balloon *vb, size_t num) in fill_balloon() argument
212 num = min(num, ARRAY_SIZE(vb->pfns)); in fill_balloon()
219 dev_info_ratelimited(&vb->vdev->dev, in fill_balloon()
230 mutex_lock(&vb->balloon_lock); in fill_balloon()
232 vb->num_pfns = 0; in fill_balloon()
235 balloon_page_enqueue(&vb->vb_dev_info, page); in fill_balloon()
237 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); in fill_balloon()
238 vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE; in fill_balloon()
239 if (!virtio_has_feature(vb->vdev, in fill_balloon()
242 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE; in fill_balloon()
245 num_allocated_pages = vb->num_pfns; in fill_balloon()
247 if (vb->num_pfns != 0) in fill_balloon()
248 tell_host(vb, vb->inflate_vq); in fill_balloon()
249 mutex_unlock(&vb->balloon_lock); in fill_balloon()
254 static void release_pages_balloon(struct virtio_balloon *vb, in release_pages_balloon() argument
260 if (!virtio_has_feature(vb->vdev, in release_pages_balloon()
268 static unsigned int leak_balloon(struct virtio_balloon *vb, size_t num) in leak_balloon() argument
272 struct balloon_dev_info *vb_dev_info = &vb->vb_dev_info; in leak_balloon()
276 num = min(num, ARRAY_SIZE(vb->pfns)); in leak_balloon()
278 mutex_lock(&vb->balloon_lock); in leak_balloon()
280 num = min(num, (size_t)vb->num_pages); in leak_balloon()
281 for (vb->num_pfns = 0; vb->num_pfns < num; in leak_balloon()
282 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) { in leak_balloon()
286 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); in leak_balloon()
288 vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE; in leak_balloon()
291 num_freed_pages = vb->num_pfns; in leak_balloon()
297 if (vb->num_pfns != 0) in leak_balloon()
298 tell_host(vb, vb->deflate_vq); in leak_balloon()
299 release_pages_balloon(vb, &pages); in leak_balloon()
300 mutex_unlock(&vb->balloon_lock); in leak_balloon()
304 static inline void update_stat(struct virtio_balloon *vb, int idx, in update_stat() argument
308 vb->stats[idx].tag = cpu_to_virtio16(vb->vdev, tag); in update_stat()
309 vb->stats[idx].val = cpu_to_virtio64(vb->vdev, val); in update_stat()
314 static unsigned int update_balloon_stats(struct virtio_balloon *vb) in update_balloon_stats() argument
329 update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_IN, in update_balloon_stats()
331 update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_OUT, in update_balloon_stats()
333 update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]); in update_balloon_stats()
334 update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]); in update_balloon_stats()
336 update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC, in update_balloon_stats()
338 update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL, in update_balloon_stats()
342 update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE, in update_balloon_stats()
344 update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMTOT, in update_balloon_stats()
346 update_stat(vb, idx++, VIRTIO_BALLOON_S_AVAIL, in update_balloon_stats()
348 update_stat(vb, idx++, VIRTIO_BALLOON_S_CACHES, in update_balloon_stats()
365 struct virtio_balloon *vb = vq->vdev->priv; in stats_request() local
367 spin_lock(&vb->stop_update_lock); in stats_request()
368 if (!vb->stop_update) in stats_request()
369 queue_work(system_freezable_wq, &vb->update_balloon_stats_work); in stats_request()
370 spin_unlock(&vb->stop_update_lock); in stats_request()
373 static void stats_handle_request(struct virtio_balloon *vb) in stats_handle_request() argument
379 num_stats = update_balloon_stats(vb); in stats_handle_request()
381 vq = vb->stats_vq; in stats_handle_request()
384 sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats); in stats_handle_request()
385 virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); in stats_handle_request()
389 static inline s64 towards_target(struct virtio_balloon *vb) in towards_target() argument
395 virtio_cread_le(vb->vdev, struct virtio_balloon_config, num_pages, in towards_target()
399 return target - vb->num_pages; in towards_target()
403 static unsigned long return_free_pages_to_mm(struct virtio_balloon *vb, in return_free_pages_to_mm() argument
409 spin_lock_irq(&vb->free_page_list_lock); in return_free_pages_to_mm()
411 page = balloon_page_pop(&vb->free_page_list); in return_free_pages_to_mm()
417 vb->num_free_page_blocks -= num_returned; in return_free_pages_to_mm()
418 spin_unlock_irq(&vb->free_page_list_lock); in return_free_pages_to_mm()
423 static void virtio_balloon_queue_free_page_work(struct virtio_balloon *vb) in virtio_balloon_queue_free_page_work() argument
425 if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtio_balloon_queue_free_page_work()
430 &vb->config_read_bitmap)) in virtio_balloon_queue_free_page_work()
433 queue_work(vb->balloon_wq, &vb->report_free_page_work); in virtio_balloon_queue_free_page_work()
438 struct virtio_balloon *vb = vdev->priv; in virtballoon_changed() local
441 spin_lock_irqsave(&vb->stop_update_lock, flags); in virtballoon_changed()
442 if (!vb->stop_update) { in virtballoon_changed()
444 &vb->update_balloon_size_work); in virtballoon_changed()
445 virtio_balloon_queue_free_page_work(vb); in virtballoon_changed()
447 spin_unlock_irqrestore(&vb->stop_update_lock, flags); in virtballoon_changed()
450 static void update_balloon_size(struct virtio_balloon *vb) in update_balloon_size() argument
452 u32 actual = vb->num_pages; in update_balloon_size()
455 virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, actual, in update_balloon_size()
461 struct virtio_balloon *vb; in update_balloon_stats_func() local
463 vb = container_of(work, struct virtio_balloon, in update_balloon_stats_func()
465 stats_handle_request(vb); in update_balloon_stats_func()
470 struct virtio_balloon *vb; in update_balloon_size_func() local
473 vb = container_of(work, struct virtio_balloon, in update_balloon_size_func()
475 diff = towards_target(vb); in update_balloon_size_func()
481 diff -= fill_balloon(vb, diff); in update_balloon_size_func()
483 diff += leak_balloon(vb, -diff); in update_balloon_size_func()
484 update_balloon_size(vb); in update_balloon_size_func()
490 static int init_vqs(struct virtio_balloon *vb) in init_vqs() argument
512 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { in init_vqs()
517 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { in init_vqs()
522 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in init_vqs()
527 err = virtio_find_vqs(vb->vdev, VIRTIO_BALLOON_VQ_MAX, vqs, in init_vqs()
532 vb->inflate_vq = vqs[VIRTIO_BALLOON_VQ_INFLATE]; in init_vqs()
533 vb->deflate_vq = vqs[VIRTIO_BALLOON_VQ_DEFLATE]; in init_vqs()
534 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { in init_vqs()
537 vb->stats_vq = vqs[VIRTIO_BALLOON_VQ_STATS]; in init_vqs()
543 num_stats = update_balloon_stats(vb); in init_vqs()
545 sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats); in init_vqs()
546 err = virtqueue_add_outbuf(vb->stats_vq, &sg, 1, vb, in init_vqs()
549 dev_warn(&vb->vdev->dev, "%s: add stat_vq failed\n", in init_vqs()
553 virtqueue_kick(vb->stats_vq); in init_vqs()
556 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in init_vqs()
557 vb->free_page_vq = vqs[VIRTIO_BALLOON_VQ_FREE_PAGE]; in init_vqs()
559 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) in init_vqs()
560 vb->reporting_vq = vqs[VIRTIO_BALLOON_VQ_REPORTING]; in init_vqs()
565 static u32 virtio_balloon_cmd_id_received(struct virtio_balloon *vb) in virtio_balloon_cmd_id_received() argument
568 &vb->config_read_bitmap)) { in virtio_balloon_cmd_id_received()
570 virtio_cread_le(vb->vdev, struct virtio_balloon_config, in virtio_balloon_cmd_id_received()
572 &vb->cmd_id_received_cache); in virtio_balloon_cmd_id_received()
575 return vb->cmd_id_received_cache; in virtio_balloon_cmd_id_received()
578 static int send_cmd_id_start(struct virtio_balloon *vb) in send_cmd_id_start() argument
581 struct virtqueue *vq = vb->free_page_vq; in send_cmd_id_start()
588 vb->cmd_id_active = cpu_to_virtio32(vb->vdev, in send_cmd_id_start()
589 virtio_balloon_cmd_id_received(vb)); in send_cmd_id_start()
590 sg_init_one(&sg, &vb->cmd_id_active, sizeof(vb->cmd_id_active)); in send_cmd_id_start()
591 err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_active, GFP_KERNEL); in send_cmd_id_start()
597 static int send_cmd_id_stop(struct virtio_balloon *vb) in send_cmd_id_stop() argument
600 struct virtqueue *vq = vb->free_page_vq; in send_cmd_id_stop()
607 sg_init_one(&sg, &vb->cmd_id_stop, sizeof(vb->cmd_id_stop)); in send_cmd_id_stop()
608 err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_stop, GFP_KERNEL); in send_cmd_id_stop()
614 static int get_free_page_and_send(struct virtio_balloon *vb) in get_free_page_and_send() argument
616 struct virtqueue *vq = vb->free_page_vq; in get_free_page_and_send()
646 spin_lock_irq(&vb->free_page_list_lock); in get_free_page_and_send()
647 balloon_page_push(&vb->free_page_list, page); in get_free_page_and_send()
648 vb->num_free_page_blocks++; in get_free_page_and_send()
649 spin_unlock_irq(&vb->free_page_list_lock); in get_free_page_and_send()
661 static int send_free_pages(struct virtio_balloon *vb) in send_free_pages() argument
671 cmd_id_active = virtio32_to_cpu(vb->vdev, vb->cmd_id_active); in send_free_pages()
673 virtio_balloon_cmd_id_received(vb))) in send_free_pages()
680 err = get_free_page_and_send(vb); in send_free_pages()
690 static void virtio_balloon_report_free_page(struct virtio_balloon *vb) in virtio_balloon_report_free_page() argument
693 struct device *dev = &vb->vdev->dev; in virtio_balloon_report_free_page()
696 err = send_cmd_id_start(vb); in virtio_balloon_report_free_page()
700 err = send_free_pages(vb); in virtio_balloon_report_free_page()
705 err = send_cmd_id_stop(vb); in virtio_balloon_report_free_page()
712 struct virtio_balloon *vb = container_of(work, struct virtio_balloon, in report_free_page_func() local
716 cmd_id_received = virtio_balloon_cmd_id_received(vb); in report_free_page_func()
719 return_free_pages_to_mm(vb, ULONG_MAX); in report_free_page_func()
722 virtio32_to_cpu(vb->vdev, vb->cmd_id_active)) { in report_free_page_func()
723 virtio_balloon_report_free_page(vb); in report_free_page_func()
749 struct virtio_balloon *vb = container_of(vb_dev_info, in virtballoon_migratepage() local
761 if (!mutex_trylock(&vb->balloon_lock)) in virtballoon_migratepage()
771 if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM) && in virtballoon_migratepage()
783 vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE; in virtballoon_migratepage()
784 set_page_pfns(vb, vb->pfns, newpage); in virtballoon_migratepage()
785 tell_host(vb, vb->inflate_vq); in virtballoon_migratepage()
791 vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE; in virtballoon_migratepage()
792 set_page_pfns(vb, vb->pfns, page); in virtballoon_migratepage()
793 tell_host(vb, vb->deflate_vq); in virtballoon_migratepage()
795 mutex_unlock(&vb->balloon_lock); in virtballoon_migratepage()
803 static unsigned long shrink_free_pages(struct virtio_balloon *vb, in shrink_free_pages() argument
811 blocks_freed = return_free_pages_to_mm(vb, blocks_to_free); in shrink_free_pages()
819 struct virtio_balloon *vb = container_of(shrinker, in virtio_balloon_shrinker_scan() local
822 return shrink_free_pages(vb, sc->nr_to_scan); in virtio_balloon_shrinker_scan()
828 struct virtio_balloon *vb = container_of(shrinker, in virtio_balloon_shrinker_count() local
831 return vb->num_free_page_blocks * VIRTIO_BALLOON_HINT_BLOCK_PAGES; in virtio_balloon_shrinker_count()
837 struct virtio_balloon *vb = container_of(nb, in virtio_balloon_oom_notify() local
841 *freed += leak_balloon(vb, VIRTIO_BALLOON_OOM_NR_PAGES) / in virtio_balloon_oom_notify()
843 update_balloon_size(vb); in virtio_balloon_oom_notify()
848 static void virtio_balloon_unregister_shrinker(struct virtio_balloon *vb) in virtio_balloon_unregister_shrinker() argument
850 unregister_shrinker(&vb->shrinker); in virtio_balloon_unregister_shrinker()
853 static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) in virtio_balloon_register_shrinker() argument
855 vb->shrinker.scan_objects = virtio_balloon_shrinker_scan; in virtio_balloon_register_shrinker()
856 vb->shrinker.count_objects = virtio_balloon_shrinker_count; in virtio_balloon_register_shrinker()
857 vb->shrinker.seeks = DEFAULT_SEEKS; in virtio_balloon_register_shrinker()
859 return register_shrinker(&vb->shrinker, "virtio-balloon"); in virtio_balloon_register_shrinker()
864 struct virtio_balloon *vb; in virtballoon_probe() local
873 vdev->priv = vb = kzalloc(sizeof(*vb), GFP_KERNEL); in virtballoon_probe()
874 if (!vb) { in virtballoon_probe()
879 INIT_WORK(&vb->update_balloon_stats_work, update_balloon_stats_func); in virtballoon_probe()
880 INIT_WORK(&vb->update_balloon_size_work, update_balloon_size_func); in virtballoon_probe()
881 spin_lock_init(&vb->stop_update_lock); in virtballoon_probe()
882 mutex_init(&vb->balloon_lock); in virtballoon_probe()
883 init_waitqueue_head(&vb->acked); in virtballoon_probe()
884 vb->vdev = vdev; in virtballoon_probe()
886 balloon_devinfo_init(&vb->vb_dev_info); in virtballoon_probe()
888 err = init_vqs(vb); in virtballoon_probe()
893 vb->vb_dev_info.migratepage = virtballoon_migratepage; in virtballoon_probe()
900 if (virtqueue_get_vring_size(vb->free_page_vq) < 2) { in virtballoon_probe()
904 vb->balloon_wq = alloc_workqueue("balloon-wq", in virtballoon_probe()
906 if (!vb->balloon_wq) { in virtballoon_probe()
910 INIT_WORK(&vb->report_free_page_work, report_free_page_func); in virtballoon_probe()
911 vb->cmd_id_received_cache = VIRTIO_BALLOON_CMD_ID_STOP; in virtballoon_probe()
912 vb->cmd_id_active = cpu_to_virtio32(vb->vdev, in virtballoon_probe()
914 vb->cmd_id_stop = cpu_to_virtio32(vb->vdev, in virtballoon_probe()
916 spin_lock_init(&vb->free_page_list_lock); in virtballoon_probe()
917 INIT_LIST_HEAD(&vb->free_page_list); in virtballoon_probe()
922 err = virtio_balloon_register_shrinker(vb); in virtballoon_probe()
927 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) { in virtballoon_probe()
928 vb->oom_nb.notifier_call = virtio_balloon_oom_notify; in virtballoon_probe()
929 vb->oom_nb.priority = VIRTIO_BALLOON_OOM_NOTIFY_PRIORITY; in virtballoon_probe()
930 err = register_oom_notifier(&vb->oom_nb); in virtballoon_probe()
951 virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, in virtballoon_probe()
955 vb->pr_dev_info.report = virtballoon_free_page_report; in virtballoon_probe()
956 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { in virtballoon_probe()
959 capacity = virtqueue_get_vring_size(vb->reporting_vq); in virtballoon_probe()
979 vb->pr_dev_info.order = 5; in virtballoon_probe()
982 err = page_reporting_register(&vb->pr_dev_info); in virtballoon_probe()
989 if (towards_target(vb)) in virtballoon_probe()
994 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) in virtballoon_probe()
995 unregister_oom_notifier(&vb->oom_nb); in virtballoon_probe()
997 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtballoon_probe()
998 virtio_balloon_unregister_shrinker(vb); in virtballoon_probe()
1001 destroy_workqueue(vb->balloon_wq); in virtballoon_probe()
1005 kfree(vb); in virtballoon_probe()
1010 static void remove_common(struct virtio_balloon *vb) in remove_common() argument
1013 while (vb->num_pages) in remove_common()
1014 leak_balloon(vb, vb->num_pages); in remove_common()
1015 update_balloon_size(vb); in remove_common()
1018 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in remove_common()
1019 return_free_pages_to_mm(vb, ULONG_MAX); in remove_common()
1022 virtio_reset_device(vb->vdev); in remove_common()
1024 vb->vdev->config->del_vqs(vb->vdev); in remove_common()
1029 struct virtio_balloon *vb = vdev->priv; in virtballoon_remove() local
1031 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) in virtballoon_remove()
1032 page_reporting_unregister(&vb->pr_dev_info); in virtballoon_remove()
1033 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) in virtballoon_remove()
1034 unregister_oom_notifier(&vb->oom_nb); in virtballoon_remove()
1035 if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) in virtballoon_remove()
1036 virtio_balloon_unregister_shrinker(vb); in virtballoon_remove()
1037 spin_lock_irq(&vb->stop_update_lock); in virtballoon_remove()
1038 vb->stop_update = true; in virtballoon_remove()
1039 spin_unlock_irq(&vb->stop_update_lock); in virtballoon_remove()
1040 cancel_work_sync(&vb->update_balloon_size_work); in virtballoon_remove()
1041 cancel_work_sync(&vb->update_balloon_stats_work); in virtballoon_remove()
1044 cancel_work_sync(&vb->report_free_page_work); in virtballoon_remove()
1045 destroy_workqueue(vb->balloon_wq); in virtballoon_remove()
1048 remove_common(vb); in virtballoon_remove()
1049 kfree(vb); in virtballoon_remove()
1055 struct virtio_balloon *vb = vdev->priv; in virtballoon_freeze() local
1061 remove_common(vb); in virtballoon_freeze()
1067 struct virtio_balloon *vb = vdev->priv; in virtballoon_restore() local
1076 if (towards_target(vb)) in virtballoon_restore()
1078 update_balloon_size(vb); in virtballoon_restore()