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1 | /* |
2 | * Virtio PMEM device | |
3 | * | |
4 | * Copyright (C) 2018-2019 Red Hat, Inc. | |
5 | * | |
6 | * Authors: | |
7 | * Pankaj Gupta <pagupta@redhat.com> | |
8 | * David Hildenbrand <david@redhat.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2. | |
11 | * See the COPYING file in the top-level directory. | |
12 | */ | |
13 | ||
14 | #include "qemu/osdep.h" | |
15 | #include "qapi/error.h" | |
16 | #include "qemu-common.h" | |
17 | #include "qemu/error-report.h" | |
18 | #include "hw/virtio/virtio-pmem.h" | |
19 | #include "hw/virtio/virtio-access.h" | |
20 | #include "standard-headers/linux/virtio_ids.h" | |
21 | #include "standard-headers/linux/virtio_pmem.h" | |
22 | #include "block/aio.h" | |
23 | #include "block/thread-pool.h" | |
24 | ||
25 | typedef struct VirtIODeviceRequest { | |
26 | VirtQueueElement elem; | |
27 | int fd; | |
28 | VirtIOPMEM *pmem; | |
29 | VirtIODevice *vdev; | |
30 | struct virtio_pmem_req req; | |
31 | struct virtio_pmem_resp resp; | |
32 | } VirtIODeviceRequest; | |
33 | ||
34 | static int worker_cb(void *opaque) | |
35 | { | |
36 | VirtIODeviceRequest *req_data = opaque; | |
37 | int err = 0; | |
38 | ||
39 | /* flush raw backing image */ | |
40 | err = fsync(req_data->fd); | |
41 | if (err != 0) { | |
42 | err = 1; | |
43 | } | |
44 | ||
45 | virtio_stw_p(req_data->vdev, &req_data->resp.ret, err); | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static void done_cb(void *opaque, int ret) | |
51 | { | |
52 | VirtIODeviceRequest *req_data = opaque; | |
53 | int len = iov_from_buf(req_data->elem.in_sg, req_data->elem.in_num, 0, | |
54 | &req_data->resp, sizeof(struct virtio_pmem_resp)); | |
55 | ||
56 | /* Callbacks are serialized, so no need to use atomic ops. */ | |
57 | virtqueue_push(req_data->pmem->rq_vq, &req_data->elem, len); | |
58 | virtio_notify((VirtIODevice *)req_data->pmem, req_data->pmem->rq_vq); | |
59 | g_free(req_data); | |
60 | } | |
61 | ||
62 | static void virtio_pmem_flush(VirtIODevice *vdev, VirtQueue *vq) | |
63 | { | |
64 | VirtIODeviceRequest *req_data; | |
65 | VirtIOPMEM *pmem = VIRTIO_PMEM(vdev); | |
66 | HostMemoryBackend *backend = MEMORY_BACKEND(pmem->memdev); | |
67 | ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context()); | |
68 | ||
69 | req_data = virtqueue_pop(vq, sizeof(VirtIODeviceRequest)); | |
70 | if (!req_data) { | |
71 | virtio_error(vdev, "virtio-pmem missing request data"); | |
72 | return; | |
73 | } | |
74 | ||
75 | if (req_data->elem.out_num < 1 || req_data->elem.in_num < 1) { | |
76 | virtio_error(vdev, "virtio-pmem request not proper"); | |
77 | g_free(req_data); | |
78 | return; | |
79 | } | |
80 | req_data->fd = memory_region_get_fd(&backend->mr); | |
81 | req_data->pmem = pmem; | |
82 | req_data->vdev = vdev; | |
83 | thread_pool_submit_aio(pool, worker_cb, req_data, done_cb, req_data); | |
84 | } | |
85 | ||
86 | static void virtio_pmem_get_config(VirtIODevice *vdev, uint8_t *config) | |
87 | { | |
88 | VirtIOPMEM *pmem = VIRTIO_PMEM(vdev); | |
89 | struct virtio_pmem_config *pmemcfg = (struct virtio_pmem_config *) config; | |
90 | ||
91 | virtio_stq_p(vdev, &pmemcfg->start, pmem->start); | |
92 | virtio_stq_p(vdev, &pmemcfg->size, memory_region_size(&pmem->memdev->mr)); | |
93 | } | |
94 | ||
95 | static uint64_t virtio_pmem_get_features(VirtIODevice *vdev, uint64_t features, | |
96 | Error **errp) | |
97 | { | |
98 | return features; | |
99 | } | |
100 | ||
101 | static void virtio_pmem_realize(DeviceState *dev, Error **errp) | |
102 | { | |
103 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
104 | VirtIOPMEM *pmem = VIRTIO_PMEM(dev); | |
105 | ||
106 | if (!pmem->memdev) { | |
107 | error_setg(errp, "virtio-pmem memdev not set"); | |
108 | return; | |
109 | } | |
110 | ||
111 | if (host_memory_backend_is_mapped(pmem->memdev)) { | |
112 | char *path = object_get_canonical_path_component(OBJECT(pmem->memdev)); | |
113 | error_setg(errp, "can't use already busy memdev: %s", path); | |
114 | g_free(path); | |
115 | return; | |
116 | } | |
117 | ||
118 | host_memory_backend_set_mapped(pmem->memdev, true); | |
119 | virtio_init(vdev, TYPE_VIRTIO_PMEM, VIRTIO_ID_PMEM, | |
120 | sizeof(struct virtio_pmem_config)); | |
121 | pmem->rq_vq = virtio_add_queue(vdev, 128, virtio_pmem_flush); | |
122 | } | |
123 | ||
124 | static void virtio_pmem_unrealize(DeviceState *dev, Error **errp) | |
125 | { | |
126 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
127 | VirtIOPMEM *pmem = VIRTIO_PMEM(dev); | |
128 | ||
129 | host_memory_backend_set_mapped(pmem->memdev, false); | |
130 | virtio_cleanup(vdev); | |
131 | } | |
132 | ||
133 | static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem, | |
134 | VirtioPMEMDeviceInfo *vi) | |
135 | { | |
136 | vi->memaddr = pmem->start; | |
7b8a8474 PG |
137 | vi->size = memory_region_size(&pmem->memdev->mr); |
138 | vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev)); | |
5f503cd9 PG |
139 | } |
140 | ||
141 | static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem, | |
142 | Error **errp) | |
143 | { | |
144 | if (!pmem->memdev) { | |
145 | error_setg(errp, "'%s' property must be set", VIRTIO_PMEM_MEMDEV_PROP); | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | return &pmem->memdev->mr; | |
150 | } | |
151 | ||
152 | static Property virtio_pmem_properties[] = { | |
153 | DEFINE_PROP_UINT64(VIRTIO_PMEM_ADDR_PROP, VirtIOPMEM, start, 0), | |
154 | DEFINE_PROP_LINK(VIRTIO_PMEM_MEMDEV_PROP, VirtIOPMEM, memdev, | |
155 | TYPE_MEMORY_BACKEND, HostMemoryBackend *), | |
156 | DEFINE_PROP_END_OF_LIST(), | |
157 | }; | |
158 | ||
159 | static void virtio_pmem_class_init(ObjectClass *klass, void *data) | |
160 | { | |
161 | DeviceClass *dc = DEVICE_CLASS(klass); | |
162 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
163 | VirtIOPMEMClass *vpc = VIRTIO_PMEM_CLASS(klass); | |
164 | ||
165 | dc->props = virtio_pmem_properties; | |
166 | ||
167 | vdc->realize = virtio_pmem_realize; | |
168 | vdc->unrealize = virtio_pmem_unrealize; | |
169 | vdc->get_config = virtio_pmem_get_config; | |
170 | vdc->get_features = virtio_pmem_get_features; | |
171 | ||
172 | vpc->fill_device_info = virtio_pmem_fill_device_info; | |
173 | vpc->get_memory_region = virtio_pmem_get_memory_region; | |
174 | } | |
175 | ||
176 | static TypeInfo virtio_pmem_info = { | |
177 | .name = TYPE_VIRTIO_PMEM, | |
178 | .parent = TYPE_VIRTIO_DEVICE, | |
179 | .class_size = sizeof(VirtIOPMEMClass), | |
180 | .class_init = virtio_pmem_class_init, | |
181 | .instance_size = sizeof(VirtIOPMEM), | |
182 | }; | |
183 | ||
184 | static void virtio_register_types(void) | |
185 | { | |
186 | type_register_static(&virtio_pmem_info); | |
187 | } | |
188 | ||
189 | type_init(virtio_register_types) |