meson: convert qapi-specific to meson
[qemu.git] / hw / vfio / ap.c
1 /*
2 * VFIO based AP matrix device assignment
3 *
4 * Copyright 2018 IBM Corp.
5 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
6 * Halil Pasic <pasic@linux.ibm.com>
7 *
8 * This work is licensed under the terms of the GNU GPL, version 2 or (at
9 * your option) any later version. See the COPYING file in the top-level
10 * directory.
11 */
12
13 #include "qemu/osdep.h"
14 #include <linux/vfio.h>
15 #include <sys/ioctl.h>
16 #include "qapi/error.h"
17 #include "hw/sysbus.h"
18 #include "hw/vfio/vfio.h"
19 #include "hw/vfio/vfio-common.h"
20 #include "hw/s390x/ap-device.h"
21 #include "qemu/error-report.h"
22 #include "qemu/module.h"
23 #include "qemu/option.h"
24 #include "qemu/config-file.h"
25 #include "cpu.h"
26 #include "kvm_s390x.h"
27 #include "migration/vmstate.h"
28 #include "hw/qdev-properties.h"
29 #include "hw/s390x/ap-bridge.h"
30 #include "exec/address-spaces.h"
31
32 #define VFIO_AP_DEVICE_TYPE "vfio-ap"
33
34 typedef struct VFIOAPDevice {
35 APDevice apdev;
36 VFIODevice vdev;
37 } VFIOAPDevice;
38
39 #define VFIO_AP_DEVICE(obj) \
40 OBJECT_CHECK(VFIOAPDevice, (obj), VFIO_AP_DEVICE_TYPE)
41
42 static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
43 {
44 vdev->needs_reset = false;
45 }
46
47 /*
48 * We don't need vfio_hot_reset_multi and vfio_eoi operations for
49 * vfio-ap device now.
50 */
51 struct VFIODeviceOps vfio_ap_ops = {
52 .vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
53 };
54
55 static void vfio_ap_put_device(VFIOAPDevice *vapdev)
56 {
57 g_free(vapdev->vdev.name);
58 vfio_put_base_device(&vapdev->vdev);
59 }
60
61 static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
62 {
63 GError *gerror = NULL;
64 char *symlink, *group_path;
65 int groupid;
66
67 symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
68 group_path = g_file_read_link(symlink, &gerror);
69 g_free(symlink);
70
71 if (!group_path) {
72 error_setg(errp, "%s: no iommu_group found for %s: %s",
73 VFIO_AP_DEVICE_TYPE, vapdev->vdev.sysfsdev, gerror->message);
74 return NULL;
75 }
76
77 if (sscanf(basename(group_path), "%d", &groupid) != 1) {
78 error_setg(errp, "vfio: failed to read %s", group_path);
79 g_free(group_path);
80 return NULL;
81 }
82
83 g_free(group_path);
84
85 return vfio_get_group(groupid, &address_space_memory, errp);
86 }
87
88 static void vfio_ap_realize(DeviceState *dev, Error **errp)
89 {
90 int ret;
91 char *mdevid;
92 VFIOGroup *vfio_group;
93 APDevice *apdev = AP_DEVICE(dev);
94 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
95
96 vfio_group = vfio_ap_get_group(vapdev, errp);
97 if (!vfio_group) {
98 return;
99 }
100
101 vapdev->vdev.ops = &vfio_ap_ops;
102 vapdev->vdev.type = VFIO_DEVICE_TYPE_AP;
103 mdevid = basename(vapdev->vdev.sysfsdev);
104 vapdev->vdev.name = g_strdup_printf("%s", mdevid);
105 vapdev->vdev.dev = dev;
106
107 /*
108 * vfio-ap devices operate in a way compatible with discarding of
109 * memory in RAM blocks, as no pages are pinned in the host.
110 * This needs to be set before vfio_get_device() for vfio common to
111 * handle ram_block_discard_disable().
112 */
113 vapdev->vdev.ram_block_discard_allowed = true;
114
115 ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, errp);
116 if (ret) {
117 goto out_get_dev_err;
118 }
119
120 return;
121
122 out_get_dev_err:
123 vfio_ap_put_device(vapdev);
124 vfio_put_group(vfio_group);
125 }
126
127 static void vfio_ap_unrealize(DeviceState *dev)
128 {
129 APDevice *apdev = AP_DEVICE(dev);
130 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
131 VFIOGroup *group = vapdev->vdev.group;
132
133 vfio_ap_put_device(vapdev);
134 vfio_put_group(group);
135 }
136
137 static Property vfio_ap_properties[] = {
138 DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
139 DEFINE_PROP_END_OF_LIST(),
140 };
141
142 static void vfio_ap_reset(DeviceState *dev)
143 {
144 int ret;
145 APDevice *apdev = AP_DEVICE(dev);
146 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
147
148 ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET);
149 if (ret) {
150 error_report("%s: failed to reset %s device: %s", __func__,
151 vapdev->vdev.name, strerror(errno));
152 }
153 }
154
155 static const VMStateDescription vfio_ap_vmstate = {
156 .name = "vfio-ap",
157 .unmigratable = 1,
158 };
159
160 static void vfio_ap_class_init(ObjectClass *klass, void *data)
161 {
162 DeviceClass *dc = DEVICE_CLASS(klass);
163
164 device_class_set_props(dc, vfio_ap_properties);
165 dc->vmsd = &vfio_ap_vmstate;
166 dc->desc = "VFIO-based AP device assignment";
167 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
168 dc->realize = vfio_ap_realize;
169 dc->unrealize = vfio_ap_unrealize;
170 dc->hotpluggable = true;
171 dc->reset = vfio_ap_reset;
172 dc->bus_type = TYPE_AP_BUS;
173 }
174
175 static const TypeInfo vfio_ap_info = {
176 .name = VFIO_AP_DEVICE_TYPE,
177 .parent = AP_DEVICE_TYPE,
178 .instance_size = sizeof(VFIOAPDevice),
179 .class_init = vfio_ap_class_init,
180 };
181
182 static void vfio_ap_type_init(void)
183 {
184 type_register_static(&vfio_ap_info);
185 }
186
187 type_init(vfio_ap_type_init)