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 CONFIG_DEVICES /* CONFIG_IOMMUFD */ 15 #include <linux/vfio.h> 16 #include <sys/ioctl.h> 17 #include "qapi/error.h" 18 #include "hw/vfio/vfio-common.h" 19 #include "sysemu/iommufd.h" 20 #include "hw/s390x/ap-device.h" 21 #include "qemu/error-report.h" 22 #include "qemu/event_notifier.h" 23 #include "qemu/main-loop.h" 24 #include "qemu/module.h" 25 #include "qemu/option.h" 26 #include "qemu/config-file.h" 27 #include "kvm/kvm_s390x.h" 28 #include "migration/vmstate.h" 29 #include "hw/qdev-properties.h" 30 #include "hw/s390x/ap-bridge.h" 31 #include "exec/address-spaces.h" 32 #include "qom/object.h" 33 34 #define TYPE_VFIO_AP_DEVICE "vfio-ap" 35 36 struct VFIOAPDevice { 37 APDevice apdev; 38 VFIODevice vdev; 39 EventNotifier req_notifier; 40 }; 41 42 OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE) 43 44 static void vfio_ap_compute_needs_reset(VFIODevice *vdev) 45 { 46 vdev->needs_reset = false; 47 } 48 49 /* 50 * We don't need vfio_hot_reset_multi and vfio_eoi operations for 51 * vfio-ap device now. 52 */ 53 struct VFIODeviceOps vfio_ap_ops = { 54 .vfio_compute_needs_reset = vfio_ap_compute_needs_reset, 55 }; 56 57 static void vfio_ap_req_notifier_handler(void *opaque) 58 { 59 VFIOAPDevice *vapdev = opaque; 60 Error *err = NULL; 61 62 if (!event_notifier_test_and_clear(&vapdev->req_notifier)) { 63 return; 64 } 65 66 qdev_unplug(DEVICE(vapdev), &err); 67 68 if (err) { 69 warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name); 70 } 71 } 72 73 static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev, 74 unsigned int irq, Error **errp) 75 { 76 int fd; 77 size_t argsz; 78 IOHandler *fd_read; 79 EventNotifier *notifier; 80 struct vfio_irq_info *irq_info; 81 VFIODevice *vdev = &vapdev->vdev; 82 83 switch (irq) { 84 case VFIO_AP_REQ_IRQ_INDEX: 85 notifier = &vapdev->req_notifier; 86 fd_read = vfio_ap_req_notifier_handler; 87 break; 88 default: 89 error_setg(errp, "vfio: Unsupported device irq(%d)", irq); 90 return; 91 } 92 93 if (vdev->num_irqs < irq + 1) { 94 error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)", 95 irq, vdev->num_irqs); 96 return; 97 } 98 99 argsz = sizeof(*irq_info); 100 irq_info = g_malloc0(argsz); 101 irq_info->index = irq; 102 irq_info->argsz = argsz; 103 104 if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO, 105 irq_info) < 0 || irq_info->count < 1) { 106 error_setg_errno(errp, errno, "vfio: Error getting irq info"); 107 goto out_free_info; 108 } 109 110 if (event_notifier_init(notifier, 0)) { 111 error_setg_errno(errp, errno, 112 "vfio: Unable to init event notifier for irq (%d)", 113 irq); 114 goto out_free_info; 115 } 116 117 fd = event_notifier_get_fd(notifier); 118 qemu_set_fd_handler(fd, fd_read, NULL, vapdev); 119 120 if (vfio_set_irq_signaling(vdev, irq, 0, VFIO_IRQ_SET_ACTION_TRIGGER, fd, 121 errp)) { 122 qemu_set_fd_handler(fd, NULL, NULL, vapdev); 123 event_notifier_cleanup(notifier); 124 } 125 126 out_free_info: 127 g_free(irq_info); 128 129 } 130 131 static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev, 132 unsigned int irq) 133 { 134 Error *err = NULL; 135 EventNotifier *notifier; 136 137 switch (irq) { 138 case VFIO_AP_REQ_IRQ_INDEX: 139 notifier = &vapdev->req_notifier; 140 break; 141 default: 142 error_report("vfio: Unsupported device irq(%d)", irq); 143 return; 144 } 145 146 if (vfio_set_irq_signaling(&vapdev->vdev, irq, 0, 147 VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) { 148 warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name); 149 } 150 151 qemu_set_fd_handler(event_notifier_get_fd(notifier), 152 NULL, NULL, vapdev); 153 event_notifier_cleanup(notifier); 154 } 155 156 static void vfio_ap_realize(DeviceState *dev, Error **errp) 157 { 158 int ret; 159 Error *err = NULL; 160 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); 161 VFIODevice *vbasedev = &vapdev->vdev; 162 163 if (vfio_device_get_name(vbasedev, errp) < 0) { 164 return; 165 } 166 167 ret = vfio_attach_device(vbasedev->name, vbasedev, 168 &address_space_memory, errp); 169 if (ret) { 170 goto error; 171 } 172 173 vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err); 174 if (err) { 175 /* 176 * Report this error, but do not make it a failing condition. 177 * Lack of this IRQ in the host does not prevent normal operation. 178 */ 179 error_report_err(err); 180 } 181 182 return; 183 184 error: 185 error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->name); 186 g_free(vbasedev->name); 187 } 188 189 static void vfio_ap_unrealize(DeviceState *dev) 190 { 191 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); 192 193 vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX); 194 vfio_detach_device(&vapdev->vdev); 195 g_free(vapdev->vdev.name); 196 } 197 198 static Property vfio_ap_properties[] = { 199 DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev), 200 #ifdef CONFIG_IOMMUFD 201 DEFINE_PROP_LINK("iommufd", VFIOAPDevice, vdev.iommufd, 202 TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *), 203 #endif 204 DEFINE_PROP_END_OF_LIST(), 205 }; 206 207 static void vfio_ap_reset(DeviceState *dev) 208 { 209 int ret; 210 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev); 211 212 ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET); 213 if (ret) { 214 error_report("%s: failed to reset %s device: %s", __func__, 215 vapdev->vdev.name, strerror(errno)); 216 } 217 } 218 219 static const VMStateDescription vfio_ap_vmstate = { 220 .name = "vfio-ap", 221 .unmigratable = 1, 222 }; 223 224 static void vfio_ap_instance_init(Object *obj) 225 { 226 VFIOAPDevice *vapdev = VFIO_AP_DEVICE(obj); 227 VFIODevice *vbasedev = &vapdev->vdev; 228 229 /* 230 * vfio-ap devices operate in a way compatible with discarding of 231 * memory in RAM blocks, as no pages are pinned in the host. 232 * This needs to be set before vfio_get_device() for vfio common to 233 * handle ram_block_discard_disable(). 234 */ 235 vfio_device_init(vbasedev, VFIO_DEVICE_TYPE_AP, &vfio_ap_ops, 236 DEVICE(vapdev), true); 237 } 238 239 #ifdef CONFIG_IOMMUFD 240 static void vfio_ap_set_fd(Object *obj, const char *str, Error **errp) 241 { 242 vfio_device_set_fd(&VFIO_AP_DEVICE(obj)->vdev, str, errp); 243 } 244 #endif 245 246 static void vfio_ap_class_init(ObjectClass *klass, void *data) 247 { 248 DeviceClass *dc = DEVICE_CLASS(klass); 249 250 device_class_set_props(dc, vfio_ap_properties); 251 #ifdef CONFIG_IOMMUFD 252 object_class_property_add_str(klass, "fd", NULL, vfio_ap_set_fd); 253 #endif 254 dc->vmsd = &vfio_ap_vmstate; 255 dc->desc = "VFIO-based AP device assignment"; 256 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 257 dc->realize = vfio_ap_realize; 258 dc->unrealize = vfio_ap_unrealize; 259 dc->hotpluggable = true; 260 dc->reset = vfio_ap_reset; 261 dc->bus_type = TYPE_AP_BUS; 262 } 263 264 static const TypeInfo vfio_ap_info = { 265 .name = TYPE_VFIO_AP_DEVICE, 266 .parent = TYPE_AP_DEVICE, 267 .instance_size = sizeof(VFIOAPDevice), 268 .instance_init = vfio_ap_instance_init, 269 .class_init = vfio_ap_class_init, 270 }; 271 272 static void vfio_ap_type_init(void) 273 { 274 type_register_static(&vfio_ap_info); 275 } 276 277 type_init(vfio_ap_type_init) 278