| /* |
| * Virtio PMEM device |
| * |
| * Copyright (C) 2018-2019 Red Hat, Inc. |
| * |
| * Authors: |
| * Pankaj Gupta <pagupta@redhat.com> |
| * David Hildenbrand <david@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. |
| * See the COPYING file in the top-level directory. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qemu-common.h" |
| #include "qemu/error-report.h" |
| #include "qemu/main-loop.h" |
| #include "hw/virtio/virtio-pmem.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/virtio/virtio-access.h" |
| #include "standard-headers/linux/virtio_ids.h" |
| #include "standard-headers/linux/virtio_pmem.h" |
| #include "sysemu/hostmem.h" |
| #include "block/aio.h" |
| #include "block/thread-pool.h" |
| |
| typedef struct VirtIODeviceRequest { |
| VirtQueueElement elem; |
| int fd; |
| VirtIOPMEM *pmem; |
| VirtIODevice *vdev; |
| struct virtio_pmem_req req; |
| struct virtio_pmem_resp resp; |
| } VirtIODeviceRequest; |
| |
| static int worker_cb(void *opaque) |
| { |
| VirtIODeviceRequest *req_data = opaque; |
| int err = 0; |
| |
| /* flush raw backing image */ |
| err = fsync(req_data->fd); |
| if (err != 0) { |
| err = 1; |
| } |
| |
| virtio_stw_p(req_data->vdev, &req_data->resp.ret, err); |
| |
| return 0; |
| } |
| |
| static void done_cb(void *opaque, int ret) |
| { |
| VirtIODeviceRequest *req_data = opaque; |
| int len = iov_from_buf(req_data->elem.in_sg, req_data->elem.in_num, 0, |
| &req_data->resp, sizeof(struct virtio_pmem_resp)); |
| |
| /* Callbacks are serialized, so no need to use atomic ops. */ |
| virtqueue_push(req_data->pmem->rq_vq, &req_data->elem, len); |
| virtio_notify((VirtIODevice *)req_data->pmem, req_data->pmem->rq_vq); |
| g_free(req_data); |
| } |
| |
| static void virtio_pmem_flush(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| VirtIODeviceRequest *req_data; |
| VirtIOPMEM *pmem = VIRTIO_PMEM(vdev); |
| HostMemoryBackend *backend = MEMORY_BACKEND(pmem->memdev); |
| ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context()); |
| |
| req_data = virtqueue_pop(vq, sizeof(VirtIODeviceRequest)); |
| if (!req_data) { |
| virtio_error(vdev, "virtio-pmem missing request data"); |
| return; |
| } |
| |
| if (req_data->elem.out_num < 1 || req_data->elem.in_num < 1) { |
| virtio_error(vdev, "virtio-pmem request not proper"); |
| g_free(req_data); |
| return; |
| } |
| req_data->fd = memory_region_get_fd(&backend->mr); |
| req_data->pmem = pmem; |
| req_data->vdev = vdev; |
| thread_pool_submit_aio(pool, worker_cb, req_data, done_cb, req_data); |
| } |
| |
| static void virtio_pmem_get_config(VirtIODevice *vdev, uint8_t *config) |
| { |
| VirtIOPMEM *pmem = VIRTIO_PMEM(vdev); |
| struct virtio_pmem_config *pmemcfg = (struct virtio_pmem_config *) config; |
| |
| virtio_stq_p(vdev, &pmemcfg->start, pmem->start); |
| virtio_stq_p(vdev, &pmemcfg->size, memory_region_size(&pmem->memdev->mr)); |
| } |
| |
| static uint64_t virtio_pmem_get_features(VirtIODevice *vdev, uint64_t features, |
| Error **errp) |
| { |
| return features; |
| } |
| |
| static void virtio_pmem_realize(DeviceState *dev, Error **errp) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VirtIOPMEM *pmem = VIRTIO_PMEM(dev); |
| |
| if (!pmem->memdev) { |
| error_setg(errp, "virtio-pmem memdev not set"); |
| return; |
| } |
| |
| if (host_memory_backend_is_mapped(pmem->memdev)) { |
| char *path = object_get_canonical_path_component(OBJECT(pmem->memdev)); |
| error_setg(errp, "can't use already busy memdev: %s", path); |
| g_free(path); |
| return; |
| } |
| |
| host_memory_backend_set_mapped(pmem->memdev, true); |
| virtio_init(vdev, TYPE_VIRTIO_PMEM, VIRTIO_ID_PMEM, |
| sizeof(struct virtio_pmem_config)); |
| pmem->rq_vq = virtio_add_queue(vdev, 128, virtio_pmem_flush); |
| } |
| |
| static void virtio_pmem_unrealize(DeviceState *dev, Error **errp) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VirtIOPMEM *pmem = VIRTIO_PMEM(dev); |
| |
| host_memory_backend_set_mapped(pmem->memdev, false); |
| virtio_delete_queue(pmem->rq_vq); |
| virtio_cleanup(vdev); |
| } |
| |
| static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem, |
| VirtioPMEMDeviceInfo *vi) |
| { |
| vi->memaddr = pmem->start; |
| vi->size = memory_region_size(&pmem->memdev->mr); |
| vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev)); |
| } |
| |
| static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem, |
| Error **errp) |
| { |
| if (!pmem->memdev) { |
| error_setg(errp, "'%s' property must be set", VIRTIO_PMEM_MEMDEV_PROP); |
| return NULL; |
| } |
| |
| return &pmem->memdev->mr; |
| } |
| |
| static Property virtio_pmem_properties[] = { |
| DEFINE_PROP_UINT64(VIRTIO_PMEM_ADDR_PROP, VirtIOPMEM, start, 0), |
| DEFINE_PROP_LINK(VIRTIO_PMEM_MEMDEV_PROP, VirtIOPMEM, memdev, |
| TYPE_MEMORY_BACKEND, HostMemoryBackend *), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void virtio_pmem_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| VirtIOPMEMClass *vpc = VIRTIO_PMEM_CLASS(klass); |
| |
| device_class_set_props(dc, virtio_pmem_properties); |
| |
| vdc->realize = virtio_pmem_realize; |
| vdc->unrealize = virtio_pmem_unrealize; |
| vdc->get_config = virtio_pmem_get_config; |
| vdc->get_features = virtio_pmem_get_features; |
| |
| vpc->fill_device_info = virtio_pmem_fill_device_info; |
| vpc->get_memory_region = virtio_pmem_get_memory_region; |
| } |
| |
| static TypeInfo virtio_pmem_info = { |
| .name = TYPE_VIRTIO_PMEM, |
| .parent = TYPE_VIRTIO_DEVICE, |
| .class_size = sizeof(VirtIOPMEMClass), |
| .class_init = virtio_pmem_class_init, |
| .instance_size = sizeof(VirtIOPMEM), |
| }; |
| |
| static void virtio_register_types(void) |
| { |
| type_register_static(&virtio_pmem_info); |
| } |
| |
| type_init(virtio_register_types) |