| 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/vfio/vfio-device.h" |
| 18 | #include "system/iommufd.h" |
| 19 | #include "hw/s390x/ap-device.h" |
| 20 | #include "hw/s390x/css.h" |
| 21 | #include "qemu/error-report.h" |
| 22 | #include "qemu/event_notifier.h" |
| 23 | #include "qemu/lockable.h" |
| 24 | #include "qemu/main-loop.h" |
| 25 | #include "qemu/module.h" |
| 26 | #include "qemu/option.h" |
| 27 | #include "qemu/config-file.h" |
| 28 | #include "target/s390x/kvm/kvm_s390x.h" |
| 29 | #include "migration/vmstate.h" |
| 30 | #include "hw/core/qdev-properties.h" |
| 31 | #include "hw/s390x/ap-bridge.h" |
| 32 | #include "system/address-spaces.h" |
| 33 | #include "qom/object.h" |
| 34 | |
| 35 | #define TYPE_VFIO_AP_DEVICE "vfio-ap" |
| 36 | |
| 37 | struct VFIOAPDevice { |
| 38 | APDevice apdev; |
| 39 | VFIODevice vdev; |
| 40 | EventNotifier req_notifier; |
| 41 | EventNotifier cfg_notifier; |
| 42 | }; |
| 43 | |
| 44 | typedef struct APConfigChgEvent { |
| 45 | QTAILQ_ENTRY(APConfigChgEvent) next; |
| 46 | } APConfigChgEvent; |
| 47 | |
| 48 | static QTAILQ_HEAD(, APConfigChgEvent) cfg_chg_events = |
| 49 | QTAILQ_HEAD_INITIALIZER(cfg_chg_events); |
| 50 | |
| 51 | static QemuMutex cfg_chg_events_lock; |
| 52 | |
| 53 | static void __attribute__((constructor)) vfio_ap_global_init(void) |
| 54 | { |
| 55 | qemu_mutex_init(&cfg_chg_events_lock); |
| 56 | } |
| 57 | |
| 58 | OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE) |
| 59 | |
| 60 | static void vfio_ap_compute_needs_reset(VFIODevice *vdev) |
| 61 | { |
| 62 | vdev->needs_reset = false; |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * We don't need vfio_hot_reset_multi and vfio_eoi operations for |
| 67 | * vfio-ap device now. |
| 68 | */ |
| 69 | struct VFIODeviceOps vfio_ap_ops = { |
| 70 | .vfio_compute_needs_reset = vfio_ap_compute_needs_reset, |
| 71 | }; |
| 72 | |
| 73 | static void vfio_ap_req_notifier_handler(void *opaque) |
| 74 | { |
| 75 | VFIOAPDevice *vapdev = opaque; |
| 76 | Error *err = NULL; |
| 77 | |
| 78 | if (!event_notifier_test_and_clear(&vapdev->req_notifier)) { |
| 79 | return; |
| 80 | } |
| 81 | |
| 82 | qdev_unplug(DEVICE(vapdev), &err); |
| 83 | |
| 84 | if (err) { |
| 85 | warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | static void vfio_ap_cfg_chg_notifier_handler(void *opaque) |
| 90 | { |
| 91 | APConfigChgEvent *cfg_chg_event; |
| 92 | VFIOAPDevice *vapdev = opaque; |
| 93 | |
| 94 | if (!event_notifier_test_and_clear(&vapdev->cfg_notifier)) { |
| 95 | return; |
| 96 | } |
| 97 | |
| 98 | cfg_chg_event = g_new0(APConfigChgEvent, 1); |
| 99 | |
| 100 | WITH_QEMU_LOCK_GUARD(&cfg_chg_events_lock) { |
| 101 | QTAILQ_INSERT_TAIL(&cfg_chg_events, cfg_chg_event, next); |
| 102 | } |
| 103 | |
| 104 | css_generate_css_crws(0); |
| 105 | |
| 106 | } |
| 107 | |
| 108 | int ap_chsc_sei_nt0_get_event(void *res) |
| 109 | { |
| 110 | ChscSeiNt0Res *nt0_res = (ChscSeiNt0Res *)res; |
| 111 | APConfigChgEvent *cfg_chg_event; |
| 112 | |
| 113 | WITH_QEMU_LOCK_GUARD(&cfg_chg_events_lock) { |
| 114 | if (QTAILQ_EMPTY(&cfg_chg_events)) { |
| 115 | return EVENT_INFORMATION_NOT_STORED; |
| 116 | } |
| 117 | |
| 118 | cfg_chg_event = QTAILQ_FIRST(&cfg_chg_events); |
| 119 | QTAILQ_REMOVE(&cfg_chg_events, cfg_chg_event, next); |
| 120 | } |
| 121 | |
| 122 | memset(nt0_res, 0, sizeof(*nt0_res)); |
| 123 | g_free(cfg_chg_event); |
| 124 | nt0_res->flags |= PENDING_EVENT_INFO_BITMASK; |
| 125 | nt0_res->length = sizeof(ChscSeiNt0Res); |
| 126 | nt0_res->code = NT0_RES_RESPONSE_CODE; |
| 127 | nt0_res->nt = NT0_RES_NT_DEFAULT; |
| 128 | nt0_res->rs = NT0_RES_RS_AP_CHANGE; |
| 129 | nt0_res->cc = NT0_RES_CC_AP_CHANGE; |
| 130 | |
| 131 | return EVENT_INFORMATION_STORED; |
| 132 | } |
| 133 | |
| 134 | bool ap_chsc_sei_nt0_have_event(void) |
| 135 | { |
| 136 | QEMU_LOCK_GUARD(&cfg_chg_events_lock); |
| 137 | return !QTAILQ_EMPTY(&cfg_chg_events); |
| 138 | } |
| 139 | |
| 140 | static bool vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev, |
| 141 | unsigned int irq, Error **errp) |
| 142 | { |
| 143 | int fd; |
| 144 | int ret; |
| 145 | IOHandler *fd_read; |
| 146 | EventNotifier *notifier; |
| 147 | struct vfio_irq_info irq_info; |
| 148 | VFIODevice *vdev = &vapdev->vdev; |
| 149 | |
| 150 | switch (irq) { |
| 151 | case VFIO_AP_REQ_IRQ_INDEX: |
| 152 | notifier = &vapdev->req_notifier; |
| 153 | fd_read = vfio_ap_req_notifier_handler; |
| 154 | break; |
| 155 | case VFIO_AP_CFG_CHG_IRQ_INDEX: |
| 156 | notifier = &vapdev->cfg_notifier; |
| 157 | fd_read = vfio_ap_cfg_chg_notifier_handler; |
| 158 | break; |
| 159 | default: |
| 160 | error_setg(errp, "vfio: Unsupported device irq(%d)", irq); |
| 161 | return false; |
| 162 | } |
| 163 | |
| 164 | if (vdev->num_irqs < irq + 1) { |
| 165 | error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)", |
| 166 | irq, vdev->num_irqs); |
| 167 | return false; |
| 168 | } |
| 169 | |
| 170 | ret = vfio_device_get_irq_info(vdev, irq, &irq_info); |
| 171 | |
| 172 | if (ret < 0) { |
| 173 | error_setg_errno(errp, -ret, "vfio: Error getting irq info"); |
| 174 | return false; |
| 175 | } |
| 176 | |
| 177 | if (irq_info.count < 1) { |
| 178 | error_setg(errp, "vfio: Error getting irq info, count=0"); |
| 179 | return false; |
| 180 | } |
| 181 | |
| 182 | if (event_notifier_init(notifier, 0) < 0) { |
| 183 | error_setg_errno(errp, errno, |
| 184 | "vfio: Unable to init event notifier for irq (%d)", |
| 185 | irq); |
| 186 | return false; |
| 187 | } |
| 188 | |
| 189 | fd = event_notifier_get_fd(notifier); |
| 190 | qemu_set_fd_handler(fd, fd_read, NULL, vapdev); |
| 191 | |
| 192 | if (!vfio_device_irq_set_signaling(vdev, irq, 0, VFIO_IRQ_SET_ACTION_TRIGGER, fd, |
| 193 | errp)) { |
| 194 | qemu_set_fd_handler(fd, NULL, NULL, vapdev); |
| 195 | event_notifier_cleanup(notifier); |
| 196 | return false; |
| 197 | } |
| 198 | |
| 199 | return true; |
| 200 | } |
| 201 | |
| 202 | static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev, |
| 203 | unsigned int irq) |
| 204 | { |
| 205 | Error *err = NULL; |
| 206 | EventNotifier *notifier; |
| 207 | |
| 208 | switch (irq) { |
| 209 | case VFIO_AP_REQ_IRQ_INDEX: |
| 210 | notifier = &vapdev->req_notifier; |
| 211 | break; |
| 212 | case VFIO_AP_CFG_CHG_IRQ_INDEX: |
| 213 | notifier = &vapdev->cfg_notifier; |
| 214 | break; |
| 215 | default: |
| 216 | error_report("vfio: Unsupported device irq(%d)", irq); |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | if (!vfio_device_irq_set_signaling(&vapdev->vdev, irq, 0, |
| 221 | VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) { |
| 222 | warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name); |
| 223 | } |
| 224 | |
| 225 | qemu_set_fd_handler(event_notifier_get_fd(notifier), |
| 226 | NULL, NULL, vapdev); |
| 227 | event_notifier_cleanup(notifier); |
| 228 | } |
| 229 | |
| 230 | static void vfio_ap_realize(DeviceState *dev, Error **errp) |
| 231 | { |
| 232 | ERRP_GUARD(); |
| 233 | Error *err = NULL; |
| 234 | VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); |
| 235 | VFIODevice *vbasedev = &vapdev->vdev; |
| 236 | |
| 237 | if (!vfio_device_get_name(vbasedev, errp)) { |
| 238 | return; |
| 239 | } |
| 240 | |
| 241 | if (!vfio_device_attach(vbasedev->name, vbasedev, |
| 242 | &address_space_memory, errp)) { |
| 243 | goto error; |
| 244 | } |
| 245 | |
| 246 | if (!vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err)) { |
| 247 | /* |
| 248 | * Report this error, but do not make it a failing condition. |
| 249 | * Lack of this IRQ in the host does not prevent normal operation. |
| 250 | */ |
| 251 | warn_report_err(err); |
| 252 | } |
| 253 | |
| 254 | if (!vfio_ap_register_irq_notifier(vapdev, VFIO_AP_CFG_CHG_IRQ_INDEX, &err)) |
| 255 | { |
| 256 | /* |
| 257 | * Report this error, but do not make it a failing condition. |
| 258 | * Lack of this IRQ in the host does not prevent normal operation. |
| 259 | */ |
| 260 | warn_report_err(err); |
| 261 | } |
| 262 | |
| 263 | return; |
| 264 | |
| 265 | error: |
| 266 | error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->name); |
| 267 | vfio_device_free_name(vbasedev); |
| 268 | } |
| 269 | |
| 270 | static void vfio_ap_unrealize(DeviceState *dev) |
| 271 | { |
| 272 | VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); |
| 273 | |
| 274 | vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX); |
| 275 | vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_CFG_CHG_IRQ_INDEX); |
| 276 | vfio_device_detach(&vapdev->vdev); |
| 277 | vfio_device_free_name(&vapdev->vdev); |
| 278 | } |
| 279 | |
| 280 | static const Property vfio_ap_properties[] = { |
| 281 | DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev), |
| 282 | DEFINE_PROP_LINK("iommufd", VFIOAPDevice, vdev.iommufd, |
| 283 | TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *), |
| 284 | }; |
| 285 | |
| 286 | static void vfio_ap_reset(DeviceState *dev) |
| 287 | { |
| 288 | int ret; |
| 289 | VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); |
| 290 | |
| 291 | ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET); |
| 292 | if (ret) { |
| 293 | error_report("%s: failed to reset %s device: %s", __func__, |
| 294 | vapdev->vdev.name, strerror(errno)); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | static const VMStateDescription vfio_ap_vmstate = { |
| 299 | .name = "vfio-ap", |
| 300 | .unmigratable = 1, |
| 301 | }; |
| 302 | |
| 303 | static void vfio_ap_instance_init(Object *obj) |
| 304 | { |
| 305 | VFIOAPDevice *vapdev = VFIO_AP_DEVICE(obj); |
| 306 | VFIODevice *vbasedev = &vapdev->vdev; |
| 307 | |
| 308 | /* |
| 309 | * vfio-ap devices operate in a way compatible with discarding of |
| 310 | * memory in RAM blocks, as no pages are pinned in the host. |
| 311 | * This needs to be set before vfio_get_device() for vfio common to |
| 312 | * handle ram_block_discard_disable(). |
| 313 | */ |
| 314 | vfio_device_init(vbasedev, VFIO_DEVICE_TYPE_AP, &vfio_ap_ops, |
| 315 | DEVICE(vapdev), true); |
| 316 | |
| 317 | /* AP device is mdev type device */ |
| 318 | vbasedev->mdev = true; |
| 319 | } |
| 320 | |
| 321 | static void vfio_ap_set_fd(Object *obj, const char *str, Error **errp) |
| 322 | { |
| 323 | vfio_device_set_fd(&VFIO_AP_DEVICE(obj)->vdev, str, errp); |
| 324 | } |
| 325 | |
| 326 | static void vfio_ap_class_init(ObjectClass *klass, const void *data) |
| 327 | { |
| 328 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 329 | |
| 330 | device_class_set_props(dc, vfio_ap_properties); |
| 331 | object_class_property_add_str(klass, "fd", NULL, vfio_ap_set_fd); |
| 332 | dc->vmsd = &vfio_ap_vmstate; |
| 333 | dc->desc = "VFIO-based AP device assignment"; |
| 334 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 335 | dc->realize = vfio_ap_realize; |
| 336 | dc->unrealize = vfio_ap_unrealize; |
| 337 | dc->hotpluggable = true; |
| 338 | device_class_set_legacy_reset(dc, vfio_ap_reset); |
| 339 | dc->bus_type = TYPE_AP_BUS; |
| 340 | |
| 341 | object_class_property_set_description(klass, /* 3.1 */ |
| 342 | "sysfsdev", |
| 343 | "Host sysfs path of assigned device"); |
| 344 | object_class_property_set_description(klass, /* 9.0 */ |
| 345 | "iommufd", |
| 346 | "Set host IOMMUFD backend device"); |
| 347 | } |
| 348 | |
| 349 | static const TypeInfo vfio_ap_info = { |
| 350 | .name = TYPE_VFIO_AP_DEVICE, |
| 351 | .parent = TYPE_AP_DEVICE, |
| 352 | .instance_size = sizeof(VFIOAPDevice), |
| 353 | .instance_init = vfio_ap_instance_init, |
| 354 | .class_init = vfio_ap_class_init, |
| 355 | }; |
| 356 | |
| 357 | static void vfio_ap_type_init(void) |
| 358 | { |
| 359 | type_register_static(&vfio_ap_info); |
| 360 | } |
| 361 | |
| 362 | type_init(vfio_ap_type_init) |