1
2
3
4
5
6
7
8
9
10
11
12
13
14#include "qemu/osdep.h"
15#include "qapi/error.h"
16#include "qemu/error-report.h"
17#include "qemu/main-loop.h"
18#include "hw/virtio/virtio-pmem.h"
19#include "hw/qdev-properties.h"
20#include "hw/virtio/virtio-access.h"
21#include "standard-headers/linux/virtio_ids.h"
22#include "standard-headers/linux/virtio_pmem.h"
23#include "sysemu/hostmem.h"
24#include "block/aio.h"
25#include "block/thread-pool.h"
26#include "trace.h"
27
28typedef struct VirtIODeviceRequest {
29 VirtQueueElement elem;
30 int fd;
31 VirtIOPMEM *pmem;
32 VirtIODevice *vdev;
33 struct virtio_pmem_req req;
34 struct virtio_pmem_resp resp;
35} VirtIODeviceRequest;
36
37static int worker_cb(void *opaque)
38{
39 VirtIODeviceRequest *req_data = opaque;
40 int err = 0;
41
42
43 err = fsync(req_data->fd);
44 trace_virtio_pmem_flush_done(err);
45 if (err != 0) {
46 err = 1;
47 }
48
49 virtio_stl_p(req_data->vdev, &req_data->resp.ret, err);
50
51 return 0;
52}
53
54static void done_cb(void *opaque, int ret)
55{
56 VirtIODeviceRequest *req_data = opaque;
57 int len = iov_from_buf(req_data->elem.in_sg, req_data->elem.in_num, 0,
58 &req_data->resp, sizeof(struct virtio_pmem_resp));
59
60
61 virtqueue_push(req_data->pmem->rq_vq, &req_data->elem, len);
62 virtio_notify((VirtIODevice *)req_data->pmem, req_data->pmem->rq_vq);
63 trace_virtio_pmem_response();
64 g_free(req_data);
65}
66
67static void virtio_pmem_flush(VirtIODevice *vdev, VirtQueue *vq)
68{
69 VirtIODeviceRequest *req_data;
70 VirtIOPMEM *pmem = VIRTIO_PMEM(vdev);
71 HostMemoryBackend *backend = MEMORY_BACKEND(pmem->memdev);
72 ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
73
74 trace_virtio_pmem_flush_request();
75 req_data = virtqueue_pop(vq, sizeof(VirtIODeviceRequest));
76 if (!req_data) {
77 virtio_error(vdev, "virtio-pmem missing request data");
78 return;
79 }
80
81 if (req_data->elem.out_num < 1 || req_data->elem.in_num < 1) {
82 virtio_error(vdev, "virtio-pmem request not proper");
83 virtqueue_detach_element(vq, (VirtQueueElement *)req_data, 0);
84 g_free(req_data);
85 return;
86 }
87 req_data->fd = memory_region_get_fd(&backend->mr);
88 req_data->pmem = pmem;
89 req_data->vdev = vdev;
90 thread_pool_submit_aio(pool, worker_cb, req_data, done_cb, req_data);
91}
92
93static void virtio_pmem_get_config(VirtIODevice *vdev, uint8_t *config)
94{
95 VirtIOPMEM *pmem = VIRTIO_PMEM(vdev);
96 struct virtio_pmem_config *pmemcfg = (struct virtio_pmem_config *) config;
97
98 virtio_stq_p(vdev, &pmemcfg->start, pmem->start);
99 virtio_stq_p(vdev, &pmemcfg->size, memory_region_size(&pmem->memdev->mr));
100}
101
102static uint64_t virtio_pmem_get_features(VirtIODevice *vdev, uint64_t features,
103 Error **errp)
104{
105 return features;
106}
107
108static void virtio_pmem_realize(DeviceState *dev, Error **errp)
109{
110 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
111 VirtIOPMEM *pmem = VIRTIO_PMEM(dev);
112
113 if (!pmem->memdev) {
114 error_setg(errp, "virtio-pmem memdev not set");
115 return;
116 }
117
118 if (host_memory_backend_is_mapped(pmem->memdev)) {
119 error_setg(errp, "can't use already busy memdev: %s",
120 object_get_canonical_path_component(OBJECT(pmem->memdev)));
121 return;
122 }
123
124 host_memory_backend_set_mapped(pmem->memdev, true);
125 virtio_init(vdev, VIRTIO_ID_PMEM, sizeof(struct virtio_pmem_config));
126 pmem->rq_vq = virtio_add_queue(vdev, 128, virtio_pmem_flush);
127}
128
129static void virtio_pmem_unrealize(DeviceState *dev)
130{
131 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
132 VirtIOPMEM *pmem = VIRTIO_PMEM(dev);
133
134 host_memory_backend_set_mapped(pmem->memdev, false);
135 virtio_delete_queue(pmem->rq_vq);
136 virtio_cleanup(vdev);
137}
138
139static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem,
140 VirtioPMEMDeviceInfo *vi)
141{
142 vi->memaddr = pmem->start;
143 vi->size = memory_region_size(&pmem->memdev->mr);
144 vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev));
145}
146
147static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem,
148 Error **errp)
149{
150 if (!pmem->memdev) {
151 error_setg(errp, "'%s' property must be set", VIRTIO_PMEM_MEMDEV_PROP);
152 return NULL;
153 }
154
155 return &pmem->memdev->mr;
156}
157
158static Property virtio_pmem_properties[] = {
159 DEFINE_PROP_UINT64(VIRTIO_PMEM_ADDR_PROP, VirtIOPMEM, start, 0),
160 DEFINE_PROP_LINK(VIRTIO_PMEM_MEMDEV_PROP, VirtIOPMEM, memdev,
161 TYPE_MEMORY_BACKEND, HostMemoryBackend *),
162 DEFINE_PROP_END_OF_LIST(),
163};
164
165static void virtio_pmem_class_init(ObjectClass *klass, void *data)
166{
167 DeviceClass *dc = DEVICE_CLASS(klass);
168 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
169 VirtIOPMEMClass *vpc = VIRTIO_PMEM_CLASS(klass);
170
171 device_class_set_props(dc, virtio_pmem_properties);
172
173 vdc->realize = virtio_pmem_realize;
174 vdc->unrealize = virtio_pmem_unrealize;
175 vdc->get_config = virtio_pmem_get_config;
176 vdc->get_features = virtio_pmem_get_features;
177
178 vpc->fill_device_info = virtio_pmem_fill_device_info;
179 vpc->get_memory_region = virtio_pmem_get_memory_region;
180 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
181}
182
183static const TypeInfo virtio_pmem_info = {
184 .name = TYPE_VIRTIO_PMEM,
185 .parent = TYPE_VIRTIO_DEVICE,
186 .class_size = sizeof(VirtIOPMEMClass),
187 .class_init = virtio_pmem_class_init,
188 .instance_size = sizeof(VirtIOPMEM),
189};
190
191static void virtio_register_types(void)
192{
193 type_register_static(&virtio_pmem_info);
194}
195
196type_init(virtio_register_types)
197
