travis: stop redefining the script commands
[qemu/ar7.git] / hw / vfio / ap.c
blob6166ccd47a4ad659c6958bf437035f00d1fae7a3
1 /*
2 * VFIO based AP matrix device assignment
4 * Copyright 2018 IBM Corp.
5 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
6 * Halil Pasic <pasic@linux.ibm.com>
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.
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/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"
31 #define VFIO_AP_DEVICE_TYPE "vfio-ap"
33 typedef struct VFIOAPDevice {
34 APDevice apdev;
35 VFIODevice vdev;
36 } VFIOAPDevice;
38 #define VFIO_AP_DEVICE(obj) \
39 OBJECT_CHECK(VFIOAPDevice, (obj), VFIO_AP_DEVICE_TYPE)
41 static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
43 vdev->needs_reset = false;
47 * We don't need vfio_hot_reset_multi and vfio_eoi operations for
48 * vfio-ap device now.
50 struct VFIODeviceOps vfio_ap_ops = {
51 .vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
54 static void vfio_ap_put_device(VFIOAPDevice *vapdev)
56 g_free(vapdev->vdev.name);
57 vfio_put_base_device(&vapdev->vdev);
60 static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
62 GError *gerror = NULL;
63 char *symlink, *group_path;
64 int groupid;
66 symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
67 group_path = g_file_read_link(symlink, &gerror);
68 g_free(symlink);
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;
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;
82 g_free(group_path);
84 return vfio_get_group(groupid, &address_space_memory, errp);
87 static void vfio_ap_realize(DeviceState *dev, Error **errp)
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);
96 vfio_group = vfio_ap_get_group(vapdev, &local_err);
97 if (!vfio_group) {
98 goto out_err;
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;
108 * vfio-ap devices operate in a way compatible with
109 * memory ballooning, as no pages are pinned in the host.
110 * This needs to be set before vfio_get_device() for vfio common to
111 * handle the balloon inhibitor.
113 vapdev->vdev.balloon_allowed = true;
115 ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, &local_err);
116 if (ret) {
117 goto out_get_dev_err;
120 return;
122 out_get_dev_err:
123 vfio_ap_put_device(vapdev);
124 vfio_put_group(vfio_group);
125 out_err:
126 error_propagate(errp, local_err);
129 static void vfio_ap_unrealize(DeviceState *dev, Error **errp)
131 APDevice *apdev = AP_DEVICE(dev);
132 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
133 VFIOGroup *group = vapdev->vdev.group;
135 vfio_ap_put_device(vapdev);
136 vfio_put_group(group);
139 static Property vfio_ap_properties[] = {
140 DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
141 DEFINE_PROP_END_OF_LIST(),
144 static void vfio_ap_reset(DeviceState *dev)
146 int ret;
147 APDevice *apdev = AP_DEVICE(dev);
148 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
150 ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET);
151 if (ret) {
152 error_report("%s: failed to reset %s device: %s", __func__,
153 vapdev->vdev.name, strerror(errno));
157 static const VMStateDescription vfio_ap_vmstate = {
158 .name = VFIO_AP_DEVICE_TYPE,
159 .unmigratable = 1,
162 static void vfio_ap_class_init(ObjectClass *klass, void *data)
164 DeviceClass *dc = DEVICE_CLASS(klass);
166 dc->props = vfio_ap_properties;
167 dc->vmsd = &vfio_ap_vmstate;
168 dc->desc = "VFIO-based AP device assignment";
169 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
170 dc->realize = vfio_ap_realize;
171 dc->unrealize = vfio_ap_unrealize;
172 dc->hotpluggable = false;
173 dc->reset = vfio_ap_reset;
174 dc->bus_type = TYPE_AP_BUS;
177 static const TypeInfo vfio_ap_info = {
178 .name = VFIO_AP_DEVICE_TYPE,
179 .parent = AP_DEVICE_TYPE,
180 .instance_size = sizeof(VFIOAPDevice),
181 .class_init = vfio_ap_class_init,
184 static void vfio_ap_type_init(void)
186 type_register_static(&vfio_ap_info);
189 type_init(vfio_ap_type_init)