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14#include "qemu/osdep.h"
15#include "qapi/error.h"
16#include "qemu/error-report.h"
17#include "qemu/iov.h"
18#include "qemu/main-loop.h"
19#include "hw/virtio/virtio-pmem.h"
20#include "hw/qdev-properties.h"
21#include "hw/virtio/virtio-access.h"
22#include "standard-headers/linux/virtio_ids.h"
23#include "standard-headers/linux/virtio_pmem.h"
24#include "sysemu/hostmem.h"
25#include "block/aio.h"
26#include "block/thread-pool.h"
27#include "trace.h"
28
29typedef struct VirtIODeviceRequest {
30 VirtQueueElement elem;
31 int fd;
32 VirtIOPMEM *pmem;
33 VirtIODevice *vdev;
34 struct virtio_pmem_req req;
35 struct virtio_pmem_resp resp;
36} VirtIODeviceRequest;
37
38static int worker_cb(void *opaque)
39{
40 VirtIODeviceRequest *req_data = opaque;
41 int err = 0;
42
43
44 err = fsync(req_data->fd);
45 trace_virtio_pmem_flush_done(err);
46 if (err != 0) {
47 err = 1;
48 }
49
50 virtio_stl_p(req_data->vdev, &req_data->resp.ret, err);
51
52 return 0;
53}
54
55static void done_cb(void *opaque, int ret)
56{
57 VirtIODeviceRequest *req_data = opaque;
58 int len = iov_from_buf(req_data->elem.in_sg, req_data->elem.in_num, 0,
59 &req_data->resp, sizeof(struct virtio_pmem_resp));
60
61
62 virtqueue_push(req_data->pmem->rq_vq, &req_data->elem, len);
63 virtio_notify((VirtIODevice *)req_data->pmem, req_data->pmem->rq_vq);
64 trace_virtio_pmem_response();
65 g_free(req_data);
66}
67
68static void virtio_pmem_flush(VirtIODevice *vdev, VirtQueue *vq)
69{
70 VirtIODeviceRequest *req_data;
71 VirtIOPMEM *pmem = VIRTIO_PMEM(vdev);
72 HostMemoryBackend *backend = MEMORY_BACKEND(pmem->memdev);
73 ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
74
75 trace_virtio_pmem_flush_request();
76 req_data = virtqueue_pop(vq, sizeof(VirtIODeviceRequest));
77 if (!req_data) {
78 virtio_error(vdev, "virtio-pmem missing request data");
79 return;
80 }
81
82 if (req_data->elem.out_num < 1 || req_data->elem.in_num < 1) {
83 virtio_error(vdev, "virtio-pmem request not proper");
84 virtqueue_detach_element(vq, (VirtQueueElement *)req_data, 0);
85 g_free(req_data);
86 return;
87 }
88 req_data->fd = memory_region_get_fd(&backend->mr);
89 req_data->pmem = pmem;
90 req_data->vdev = vdev;
91 thread_pool_submit_aio(pool, worker_cb, req_data, done_cb, req_data);
92}
93
94static void virtio_pmem_get_config(VirtIODevice *vdev, uint8_t *config)
95{
96 VirtIOPMEM *pmem = VIRTIO_PMEM(vdev);
97 struct virtio_pmem_config *pmemcfg = (struct virtio_pmem_config *) config;
98
99 virtio_stq_p(vdev, &pmemcfg->start, pmem->start);
100 virtio_stq_p(vdev, &pmemcfg->size, memory_region_size(&pmem->memdev->mr));
101}
102
103static uint64_t virtio_pmem_get_features(VirtIODevice *vdev, uint64_t features,
104 Error **errp)
105{
106 return features;
107}
108
109static void virtio_pmem_realize(DeviceState *dev, Error **errp)
110{
111 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
112 VirtIOPMEM *pmem = VIRTIO_PMEM(dev);
113
114 if (!pmem->memdev) {
115 error_setg(errp, "virtio-pmem memdev not set");
116 return;
117 }
118
119 if (host_memory_backend_is_mapped(pmem->memdev)) {
120 error_setg(errp, "can't use already busy memdev: %s",
121 object_get_canonical_path_component(OBJECT(pmem->memdev)));
122 return;
123 }
124
125 host_memory_backend_set_mapped(pmem->memdev, true);
126 virtio_init(vdev, VIRTIO_ID_PMEM, sizeof(struct virtio_pmem_config));
127 pmem->rq_vq = virtio_add_queue(vdev, 128, virtio_pmem_flush);
128}
129
130static void virtio_pmem_unrealize(DeviceState *dev)
131{
132 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
133 VirtIOPMEM *pmem = VIRTIO_PMEM(dev);
134
135 host_memory_backend_set_mapped(pmem->memdev, false);
136 virtio_delete_queue(pmem->rq_vq);
137 virtio_cleanup(vdev);
138}
139
140static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem,
141 VirtioPMEMDeviceInfo *vi)
142{
143 vi->memaddr = pmem->start;
144 vi->size = memory_region_size(&pmem->memdev->mr);
145 vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev));
146}
147
148static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem,
149 Error **errp)
150{
151 if (!pmem->memdev) {
152 error_setg(errp, "'%s' property must be set", VIRTIO_PMEM_MEMDEV_PROP);
153 return NULL;
154 }
155
156 return &pmem->memdev->mr;
157}
158
159static Property virtio_pmem_properties[] = {
160 DEFINE_PROP_UINT64(VIRTIO_PMEM_ADDR_PROP, VirtIOPMEM, start, 0),
161 DEFINE_PROP_LINK(VIRTIO_PMEM_MEMDEV_PROP, VirtIOPMEM, memdev,
162 TYPE_MEMORY_BACKEND, HostMemoryBackend *),
163 DEFINE_PROP_END_OF_LIST(),
164};
165
166static void virtio_pmem_class_init(ObjectClass *klass, void *data)
167{
168 DeviceClass *dc = DEVICE_CLASS(klass);
169 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
170 VirtIOPMEMClass *vpc = VIRTIO_PMEM_CLASS(klass);
171
172 device_class_set_props(dc, virtio_pmem_properties);
173
174 vdc->realize = virtio_pmem_realize;
175 vdc->unrealize = virtio_pmem_unrealize;
176 vdc->get_config = virtio_pmem_get_config;
177 vdc->get_features = virtio_pmem_get_features;
178
179 vpc->fill_device_info = virtio_pmem_fill_device_info;
180 vpc->get_memory_region = virtio_pmem_get_memory_region;
181 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
182}
183
184static const TypeInfo virtio_pmem_info = {
185 .name = TYPE_VIRTIO_PMEM,
186 .parent = TYPE_VIRTIO_DEVICE,
187 .class_size = sizeof(VirtIOPMEMClass),
188 .class_init = virtio_pmem_class_init,
189 .instance_size = sizeof(VirtIOPMEM),
190};
191
192static void virtio_register_types(void)
193{
194 type_register_static(&virtio_pmem_info);
195}
196
197type_init(virtio_register_types)
198