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5f503cd9 PG |
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" | |
db725815 | 18 | #include "qemu/main-loop.h" |
5f503cd9 | 19 | #include "hw/virtio/virtio-pmem.h" |
a27bd6c7 | 20 | #include "hw/qdev-properties.h" |
5f503cd9 PG |
21 | #include "hw/virtio/virtio-access.h" |
22 | #include "standard-headers/linux/virtio_ids.h" | |
23 | #include "standard-headers/linux/virtio_pmem.h" | |
7969dd91 | 24 | #include "sysemu/hostmem.h" |
5f503cd9 PG |
25 | #include "block/aio.h" |
26 | #include "block/thread-pool.h" | |
27 | ||
28 | typedef 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 | ||
37 | static int worker_cb(void *opaque) | |
38 | { | |
39 | VirtIODeviceRequest *req_data = opaque; | |
40 | int err = 0; | |
41 | ||
42 | /* flush raw backing image */ | |
43 | err = fsync(req_data->fd); | |
44 | if (err != 0) { | |
45 | err = 1; | |
46 | } | |
47 | ||
48 | virtio_stw_p(req_data->vdev, &req_data->resp.ret, err); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static void done_cb(void *opaque, int ret) | |
54 | { | |
55 | VirtIODeviceRequest *req_data = opaque; | |
56 | int len = iov_from_buf(req_data->elem.in_sg, req_data->elem.in_num, 0, | |
57 | &req_data->resp, sizeof(struct virtio_pmem_resp)); | |
58 | ||
59 | /* Callbacks are serialized, so no need to use atomic ops. */ | |
60 | virtqueue_push(req_data->pmem->rq_vq, &req_data->elem, len); | |
61 | virtio_notify((VirtIODevice *)req_data->pmem, req_data->pmem->rq_vq); | |
62 | g_free(req_data); | |
63 | } | |
64 | ||
65 | static void virtio_pmem_flush(VirtIODevice *vdev, VirtQueue *vq) | |
66 | { | |
67 | VirtIODeviceRequest *req_data; | |
68 | VirtIOPMEM *pmem = VIRTIO_PMEM(vdev); | |
69 | HostMemoryBackend *backend = MEMORY_BACKEND(pmem->memdev); | |
70 | ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context()); | |
71 | ||
72 | req_data = virtqueue_pop(vq, sizeof(VirtIODeviceRequest)); | |
73 | if (!req_data) { | |
74 | virtio_error(vdev, "virtio-pmem missing request data"); | |
75 | return; | |
76 | } | |
77 | ||
78 | if (req_data->elem.out_num < 1 || req_data->elem.in_num < 1) { | |
79 | virtio_error(vdev, "virtio-pmem request not proper"); | |
2bc9e0da | 80 | virtqueue_detach_element(vq, (VirtQueueElement *)req_data, 0); |
5f503cd9 PG |
81 | g_free(req_data); |
82 | return; | |
83 | } | |
84 | req_data->fd = memory_region_get_fd(&backend->mr); | |
85 | req_data->pmem = pmem; | |
86 | req_data->vdev = vdev; | |
87 | thread_pool_submit_aio(pool, worker_cb, req_data, done_cb, req_data); | |
88 | } | |
89 | ||
90 | static void virtio_pmem_get_config(VirtIODevice *vdev, uint8_t *config) | |
91 | { | |
92 | VirtIOPMEM *pmem = VIRTIO_PMEM(vdev); | |
93 | struct virtio_pmem_config *pmemcfg = (struct virtio_pmem_config *) config; | |
94 | ||
95 | virtio_stq_p(vdev, &pmemcfg->start, pmem->start); | |
96 | virtio_stq_p(vdev, &pmemcfg->size, memory_region_size(&pmem->memdev->mr)); | |
97 | } | |
98 | ||
99 | static uint64_t virtio_pmem_get_features(VirtIODevice *vdev, uint64_t features, | |
100 | Error **errp) | |
101 | { | |
102 | return features; | |
103 | } | |
104 | ||
105 | static void virtio_pmem_realize(DeviceState *dev, Error **errp) | |
106 | { | |
107 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
108 | VirtIOPMEM *pmem = VIRTIO_PMEM(dev); | |
109 | ||
110 | if (!pmem->memdev) { | |
111 | error_setg(errp, "virtio-pmem memdev not set"); | |
112 | return; | |
113 | } | |
114 | ||
115 | if (host_memory_backend_is_mapped(pmem->memdev)) { | |
7a309cc9 MA |
116 | error_setg(errp, "can't use already busy memdev: %s", |
117 | object_get_canonical_path_component(OBJECT(pmem->memdev))); | |
5f503cd9 PG |
118 | return; |
119 | } | |
120 | ||
121 | host_memory_backend_set_mapped(pmem->memdev, true); | |
122 | virtio_init(vdev, TYPE_VIRTIO_PMEM, VIRTIO_ID_PMEM, | |
123 | sizeof(struct virtio_pmem_config)); | |
124 | pmem->rq_vq = virtio_add_queue(vdev, 128, virtio_pmem_flush); | |
125 | } | |
126 | ||
b69c3c21 | 127 | static void virtio_pmem_unrealize(DeviceState *dev) |
5f503cd9 PG |
128 | { |
129 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
130 | VirtIOPMEM *pmem = VIRTIO_PMEM(dev); | |
131 | ||
132 | host_memory_backend_set_mapped(pmem->memdev, false); | |
9861546e | 133 | virtio_delete_queue(pmem->rq_vq); |
5f503cd9 PG |
134 | virtio_cleanup(vdev); |
135 | } | |
136 | ||
137 | static void virtio_pmem_fill_device_info(const VirtIOPMEM *pmem, | |
138 | VirtioPMEMDeviceInfo *vi) | |
139 | { | |
140 | vi->memaddr = pmem->start; | |
7b8a8474 PG |
141 | vi->size = memory_region_size(&pmem->memdev->mr); |
142 | vi->memdev = object_get_canonical_path(OBJECT(pmem->memdev)); | |
5f503cd9 PG |
143 | } |
144 | ||
145 | static MemoryRegion *virtio_pmem_get_memory_region(VirtIOPMEM *pmem, | |
146 | Error **errp) | |
147 | { | |
148 | if (!pmem->memdev) { | |
149 | error_setg(errp, "'%s' property must be set", VIRTIO_PMEM_MEMDEV_PROP); | |
150 | return NULL; | |
151 | } | |
152 | ||
153 | return &pmem->memdev->mr; | |
154 | } | |
155 | ||
156 | static Property virtio_pmem_properties[] = { | |
157 | DEFINE_PROP_UINT64(VIRTIO_PMEM_ADDR_PROP, VirtIOPMEM, start, 0), | |
158 | DEFINE_PROP_LINK(VIRTIO_PMEM_MEMDEV_PROP, VirtIOPMEM, memdev, | |
159 | TYPE_MEMORY_BACKEND, HostMemoryBackend *), | |
160 | DEFINE_PROP_END_OF_LIST(), | |
161 | }; | |
162 | ||
163 | static void virtio_pmem_class_init(ObjectClass *klass, void *data) | |
164 | { | |
165 | DeviceClass *dc = DEVICE_CLASS(klass); | |
166 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
167 | VirtIOPMEMClass *vpc = VIRTIO_PMEM_CLASS(klass); | |
168 | ||
4f67d30b | 169 | device_class_set_props(dc, virtio_pmem_properties); |
5f503cd9 PG |
170 | |
171 | vdc->realize = virtio_pmem_realize; | |
172 | vdc->unrealize = virtio_pmem_unrealize; | |
173 | vdc->get_config = virtio_pmem_get_config; | |
174 | vdc->get_features = virtio_pmem_get_features; | |
175 | ||
176 | vpc->fill_device_info = virtio_pmem_fill_device_info; | |
177 | vpc->get_memory_region = virtio_pmem_get_memory_region; | |
178 | } | |
179 | ||
180 | static TypeInfo virtio_pmem_info = { | |
181 | .name = TYPE_VIRTIO_PMEM, | |
182 | .parent = TYPE_VIRTIO_DEVICE, | |
183 | .class_size = sizeof(VirtIOPMEMClass), | |
184 | .class_init = virtio_pmem_class_init, | |
185 | .instance_size = sizeof(VirtIOPMEM), | |
186 | }; | |
187 | ||
188 | static void virtio_register_types(void) | |
189 | { | |
190 | type_register_static(&virtio_pmem_info); | |
191 | } | |
192 | ||
193 | type_init(virtio_register_types) |