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/*
* 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)
{
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)
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