This patch adds trace events for virtio-pmem functionality. Adding trace events for virtio pmem request, reponse and host side fsync functionality. Signed-off-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Message-Id: <20201117115705.32195-1-pankaj.gupta.linux@gmail.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
198 lines
5.8 KiB
C
198 lines
5.8 KiB
C
/*
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* Virtio PMEM device
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*
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* Copyright (C) 2018-2019 Red Hat, Inc.
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*
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* Authors:
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* Pankaj Gupta <pagupta@redhat.com>
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* David Hildenbrand <david@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "hw/virtio/virtio-pmem.h"
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#include "hw/qdev-properties.h"
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#include "hw/virtio/virtio-access.h"
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#include "standard-headers/linux/virtio_ids.h"
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#include "standard-headers/linux/virtio_pmem.h"
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#include "sysemu/hostmem.h"
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#include "block/aio.h"
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#include "block/thread-pool.h"
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#include "trace.h"
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typedef struct VirtIODeviceRequest {
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VirtQueueElement elem;
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int fd;
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VirtIOPMEM *pmem;
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VirtIODevice *vdev;
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struct virtio_pmem_req req;
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struct virtio_pmem_resp resp;
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} VirtIODeviceRequest;
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static int worker_cb(void *opaque)
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{
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VirtIODeviceRequest *req_data = opaque;
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int err = 0;
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/* flush raw backing image */
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err = fsync(req_data->fd);
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trace_virtio_pmem_flush_done(err);
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if (err != 0) {
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err = 1;
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}
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virtio_stw_p(req_data->vdev, &req_data->resp.ret, err);
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return 0;
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}
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static void done_cb(void *opaque, int ret)
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{
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VirtIODeviceRequest *req_data = opaque;
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int len = iov_from_buf(req_data->elem.in_sg, req_data->elem.in_num, 0,
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&req_data->resp, sizeof(struct virtio_pmem_resp));
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/* Callbacks are serialized, so no need to use atomic ops. */
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virtqueue_push(req_data->pmem->rq_vq, &req_data->elem, len);
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virtio_notify((VirtIODevice *)req_data->pmem, req_data->pmem->rq_vq);
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trace_virtio_pmem_response();
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g_free(req_data);
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}
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static void virtio_pmem_flush(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIODeviceRequest *req_data;
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VirtIOPMEM *pmem = VIRTIO_PMEM(vdev);
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HostMemoryBackend *backend = MEMORY_BACKEND(pmem->memdev);
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ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
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trace_virtio_pmem_flush_request();
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req_data = virtqueue_pop(vq, sizeof(VirtIODeviceRequest));
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if (!req_data) {
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virtio_error(vdev, "virtio-pmem missing request data");
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return;
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}
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if (req_data->elem.out_num < 1 || req_data->elem.in_num < 1) {
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virtio_error(vdev, "virtio-pmem request not proper");
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virtqueue_detach_element(vq, (VirtQueueElement *)req_data, 0);
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g_free(req_data);
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return;
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}
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req_data->fd = memory_region_get_fd(&backend->mr);
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req_data->pmem = pmem;
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req_data->vdev = vdev;
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thread_pool_submit_aio(pool, worker_cb, req_data, done_cb, req_data);
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}
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static void virtio_pmem_get_config(VirtIODevice *vdev, uint8_t *config)
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{
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VirtIOPMEM *pmem = VIRTIO_PMEM(vdev);
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struct virtio_pmem_config *pmemcfg = (struct virtio_pmem_config *) config;
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virtio_stq_p(vdev, &pmemcfg->start, pmem->start);
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virtio_stq_p(vdev, &pmemcfg->size, memory_region_size(&pmem->memdev->mr));
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}
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static uint64_t virtio_pmem_get_features(VirtIODevice *vdev, uint64_t features,
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Error **errp)
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{
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return features;
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}
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static void virtio_pmem_realize(DeviceState *dev, Error **errp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VirtIOPMEM *pmem = VIRTIO_PMEM(dev);
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if (!pmem->memdev) {
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error_setg(errp, "virtio-pmem memdev not set");
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return;
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}
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if (host_memory_backend_is_mapped(pmem->memdev)) {
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error_setg(errp, "can't use already busy memdev: %s",
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object_get_canonical_path_component(OBJECT(pmem->memdev)));
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return;
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}
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host_memory_backend_set_mapped(pmem->memdev, true);
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virtio_init(vdev, TYPE_VIRTIO_PMEM, VIRTIO_ID_PMEM,
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sizeof(struct virtio_pmem_config));
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pmem->rq_vq = virtio_add_queue(vdev, 128, virtio_pmem_flush);
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}
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static void virtio_pmem_unrealize(DeviceState *dev)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VirtIOPMEM *pmem = VIRTIO_PMEM(dev);
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host_memory_backend_set_mapped(pmem->memdev, false);
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virtio_delete_queue(pmem->rq_vq);
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virtio_cleanup(vdev);
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}
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static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem,
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VirtioPMEMDeviceInfo *vi)
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{
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vi->memaddr = pmem->start;
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vi->size = memory_region_size(&pmem->memdev->mr);
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vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev));
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}
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static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem,
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Error **errp)
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{
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if (!pmem->memdev) {
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error_setg(errp, "'%s' property must be set", VIRTIO_PMEM_MEMDEV_PROP);
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return NULL;
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}
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return &pmem->memdev->mr;
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}
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static Property virtio_pmem_properties[] = {
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DEFINE_PROP_UINT64(VIRTIO_PMEM_ADDR_PROP, VirtIOPMEM, start, 0),
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DEFINE_PROP_LINK(VIRTIO_PMEM_MEMDEV_PROP, VirtIOPMEM, memdev,
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TYPE_MEMORY_BACKEND, HostMemoryBackend *),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void virtio_pmem_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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VirtIOPMEMClass *vpc = VIRTIO_PMEM_CLASS(klass);
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device_class_set_props(dc, virtio_pmem_properties);
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vdc->realize = virtio_pmem_realize;
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vdc->unrealize = virtio_pmem_unrealize;
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vdc->get_config = virtio_pmem_get_config;
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vdc->get_features = virtio_pmem_get_features;
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vpc->fill_device_info = virtio_pmem_fill_device_info;
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vpc->get_memory_region = virtio_pmem_get_memory_region;
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}
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static TypeInfo virtio_pmem_info = {
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.name = TYPE_VIRTIO_PMEM,
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.parent = TYPE_VIRTIO_DEVICE,
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.class_size = sizeof(VirtIOPMEMClass),
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.class_init = virtio_pmem_class_init,
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.instance_size = sizeof(VirtIOPMEM),
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};
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static void virtio_register_types(void)
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{
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type_register_static(&virtio_pmem_info);
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}
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type_init(virtio_register_types)
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