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 <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 33 typedef 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 41 static void vfio_ap_compute_needs_reset(VFIODevice *vdev) 42 { 43 vdev->needs_reset = false; 44 } 45 46 /* 47 * We don't need vfio_hot_reset_multi and vfio_eoi operations for 48 * vfio-ap device now. 49 */ 50 struct VFIODeviceOps vfio_ap_ops = { 51 .vfio_compute_needs_reset = vfio_ap_compute_needs_reset, 52 }; 53 54 static void vfio_ap_put_device(VFIOAPDevice *vapdev) 55 { 56 g_free(vapdev->vdev.name); 57 vfio_put_base_device(&vapdev->vdev); 58 } 59 60 static 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 87 static 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; 113 114 out_get_dev_err: 115 vfio_ap_put_device(vapdev); 116 vfio_put_group(vfio_group); 117 out_err: 118 error_propagate(errp, local_err); 119 } 120 121 static 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 } 130 131 static Property vfio_ap_properties[] = { 132 DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev), 133 DEFINE_PROP_END_OF_LIST(), 134 }; 135 136 static 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(ret)); 146 } 147 } 148 149 static const VMStateDescription vfio_ap_vmstate = { 150 .name = VFIO_AP_DEVICE_TYPE, 151 .unmigratable = 1, 152 }; 153 154 static 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 } 168 169 static 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 }; 175 176 static void vfio_ap_type_init(void) 177 { 178 type_register_static(&vfio_ap_info); 179 } 180 181 type_init(vfio_ap_type_init) 182