hw/arm/raspi: fix CPRMAN base address
[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 #include "qom/object.h"
32
33 #define TYPE_VFIO_AP_DEVICE "vfio-ap"
34
35 struct VFIOAPDevice {
36 APDevice apdev;
37 VFIODevice vdev;
38 };
39
40 OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE)
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 TYPE_VFIO_AP_DEVICE, vapdev->vdev.sysfsdev, gerror->message);
74 g_error_free(gerror);
75 return NULL;
76 }
77
78 if (sscanf(basename(group_path), "%d", &groupid) != 1) {
79 error_setg(errp, "vfio: failed to read %s", group_path);
80 g_free(group_path);
81 return NULL;
82 }
83
84 g_free(group_path);
85
86 return vfio_get_group(groupid, &address_space_memory, errp);
87 }
88
89 static void vfio_ap_realize(DeviceState *dev, Error **errp)
90 {
91 int ret;
92 char *mdevid;
93 VFIOGroup *vfio_group;
94 APDevice *apdev = AP_DEVICE(dev);
95 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
96
97 vfio_group = vfio_ap_get_group(vapdev, errp);
98 if (!vfio_group) {
99 return;
100 }
101
102 vapdev->vdev.ops = &vfio_ap_ops;
103 vapdev->vdev.type = VFIO_DEVICE_TYPE_AP;
104 mdevid = basename(vapdev->vdev.sysfsdev);
105 vapdev->vdev.name = g_strdup_printf("%s", mdevid);
106 vapdev->vdev.dev = dev;
107
108 /*
109 * vfio-ap devices operate in a way compatible with discarding of
110 * memory in RAM blocks, as no pages are pinned in the host.
111 * This needs to be set before vfio_get_device() for vfio common to
112 * handle ram_block_discard_disable().
113 */
114 vapdev->vdev.ram_block_discard_allowed = true;
115
116 ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, errp);
117 if (ret) {
118 goto out_get_dev_err;
119 }
120
121 return;
122
123 out_get_dev_err:
124 vfio_ap_put_device(vapdev);
125 vfio_put_group(vfio_group);
126 }
127
128 static void vfio_ap_unrealize(DeviceState *dev)
129 {
130 APDevice *apdev = AP_DEVICE(dev);
131 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
132 VFIOGroup *group = vapdev->vdev.group;
133
134 vfio_ap_put_device(vapdev);
135 vfio_put_group(group);
136 }
137
138 static Property vfio_ap_properties[] = {
139 DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
140 DEFINE_PROP_END_OF_LIST(),
141 };
142
143 static void vfio_ap_reset(DeviceState *dev)
144 {
145 int ret;
146 APDevice *apdev = AP_DEVICE(dev);
147 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
148
149 ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET);
150 if (ret) {
151 error_report("%s: failed to reset %s device: %s", __func__,
152 vapdev->vdev.name, strerror(errno));
153 }
154 }
155
156 static const VMStateDescription vfio_ap_vmstate = {
157 .name = "vfio-ap",
158 .unmigratable = 1,
159 };
160
161 static void vfio_ap_class_init(ObjectClass *klass, void *data)
162 {
163 DeviceClass *dc = DEVICE_CLASS(klass);
164
165 device_class_set_props(dc, vfio_ap_properties);
166 dc->vmsd = &vfio_ap_vmstate;
167 dc->desc = "VFIO-based AP device assignment";
168 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
169 dc->realize = vfio_ap_realize;
170 dc->unrealize = vfio_ap_unrealize;
171 dc->hotpluggable = true;
172 dc->reset = vfio_ap_reset;
173 dc->bus_type = TYPE_AP_BUS;
174 }
175
176 static const TypeInfo vfio_ap_info = {
177 .name = TYPE_VFIO_AP_DEVICE,
178 .parent = TYPE_AP_DEVICE,
179 .instance_size = sizeof(VFIOAPDevice),
180 .class_init = vfio_ap_class_init,
181 };
182
183 static void vfio_ap_type_init(void)
184 {
185 type_register_static(&vfio_ap_info);
186 }
187
188 type_init(vfio_ap_type_init)