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13#include <linux/vfio.h>
14#include <sys/ioctl.h>
15#include "qemu/osdep.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/queue.h"
23#include "qemu/option.h"
24#include "qemu/config-file.h"
25#include "cpu.h"
26#include "kvm_s390x.h"
27#include "sysemu/sysemu.h"
28#include "hw/s390x/ap-bridge.h"
29#include "exec/address-spaces.h"
30
31#define VFIO_AP_DEVICE_TYPE "vfio-ap"
32
33typedef struct VFIOAPDevice {
34 APDevice apdev;
35 VFIODevice vdev;
36} VFIOAPDevice;
37
38#define VFIO_AP_DEVICE(obj) \
39 OBJECT_CHECK(VFIOAPDevice, (obj), VFIO_AP_DEVICE_TYPE)
40
41static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
42{
43 vdev->needs_reset = false;
44}
45
46
47
48
49
50struct VFIODeviceOps vfio_ap_ops = {
51 .vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
52};
53
54static void vfio_ap_put_device(VFIOAPDevice *vapdev)
55{
56 g_free(vapdev->vdev.name);
57 vfio_put_base_device(&vapdev->vdev);
58}
59
60static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
61{
62 GError *gerror = NULL;
63 char *symlink, *group_path;
64 int groupid;
65
66 symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
67 group_path = g_file_read_link(symlink, &gerror);
68 g_free(symlink);
69
70 if (!group_path) {
71 error_setg(errp, "%s: no iommu_group found for %s: %s",
72 VFIO_AP_DEVICE_TYPE, vapdev->vdev.sysfsdev, gerror->message);
73 return NULL;
74 }
75
76 if (sscanf(basename(group_path), "%d", &groupid) != 1) {
77 error_setg(errp, "vfio: failed to read %s", group_path);
78 g_free(group_path);
79 return NULL;
80 }
81
82 g_free(group_path);
83
84 return vfio_get_group(groupid, &address_space_memory, errp);
85}
86
87static void vfio_ap_realize(DeviceState *dev, Error **errp)
88{
89 int ret;
90 char *mdevid;
91 Error *local_err = NULL;
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, &local_err);
97 if (!vfio_group) {
98 goto out_err;
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 ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, &local_err);
108 if (ret) {
109 goto out_get_dev_err;
110 }
111
112 return;
113
114out_get_dev_err:
115 vfio_ap_put_device(vapdev);
116 vfio_put_group(vfio_group);
117out_err:
118 error_propagate(errp, local_err);
119}
120
121static void vfio_ap_unrealize(DeviceState *dev, Error **errp)
122{
123 APDevice *apdev = AP_DEVICE(dev);
124 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
125 VFIOGroup *group = vapdev->vdev.group;
126
127 vfio_ap_put_device(vapdev);
128 vfio_put_group(group);
129}
130
131static Property vfio_ap_properties[] = {
132 DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
133 DEFINE_PROP_END_OF_LIST(),
134};
135
136static void vfio_ap_reset(DeviceState *dev)
137{
138 int ret;
139 APDevice *apdev = AP_DEVICE(dev);
140 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
141
142 ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET);
143 if (ret) {
144 error_report("%s: failed to reset %s device: %s", __func__,
145 vapdev->vdev.name, strerror(errno));
146 }
147}
148
149static const VMStateDescription vfio_ap_vmstate = {
150 .name = VFIO_AP_DEVICE_TYPE,
151 .unmigratable = 1,
152};
153
154static void vfio_ap_class_init(ObjectClass *klass, void *data)
155{
156 DeviceClass *dc = DEVICE_CLASS(klass);
157
158 dc->props = vfio_ap_properties;
159 dc->vmsd = &vfio_ap_vmstate;
160 dc->desc = "VFIO-based AP device assignment";
161 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
162 dc->realize = vfio_ap_realize;
163 dc->unrealize = vfio_ap_unrealize;
164 dc->hotpluggable = false;
165 dc->reset = vfio_ap_reset;
166 dc->bus_type = TYPE_AP_BUS;
167}
168
169static const TypeInfo vfio_ap_info = {
170 .name = VFIO_AP_DEVICE_TYPE,
171 .parent = AP_DEVICE_TYPE,
172 .instance_size = sizeof(VFIOAPDevice),
173 .class_init = vfio_ap_class_init,
174};
175
176static void vfio_ap_type_init(void)
177{
178 type_register_static(&vfio_ap_info);
179}
180
181type_init(vfio_ap_type_init)
182
