1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * VFIO based AP device driver 4 * 5 * Copyright IBM Corp. 2018 6 * 7 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com> 8 * Pierre Morel <pmorel@linux.ibm.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/mod_devicetable.h> 13 #include <linux/slab.h> 14 #include <linux/string.h> 15 #include <asm/facility.h> 16 #include "vfio_ap_private.h" 17 #include "vfio_ap_debug.h" 18 19 #define VFIO_AP_ROOT_NAME "vfio_ap" 20 #define VFIO_AP_DEV_NAME "matrix" 21 22 MODULE_AUTHOR("IBM Corporation"); 23 MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018"); 24 MODULE_LICENSE("GPL v2"); 25 26 struct ap_matrix_dev *matrix_dev; 27 debug_info_t *vfio_ap_dbf_info; 28 29 /* Only type 10 adapters (CEX4 and later) are supported 30 * by the AP matrix device driver 31 */ 32 static struct ap_device_id ap_queue_ids[] = { 33 { .dev_type = AP_DEVICE_TYPE_CEX4, 34 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 35 { .dev_type = AP_DEVICE_TYPE_CEX5, 36 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 37 { .dev_type = AP_DEVICE_TYPE_CEX6, 38 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 39 { .dev_type = AP_DEVICE_TYPE_CEX7, 40 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 41 { .dev_type = AP_DEVICE_TYPE_CEX8, 42 .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, 43 { /* end of sibling */ }, 44 }; 45 46 static struct ap_driver vfio_ap_drv = { 47 .probe = vfio_ap_mdev_probe_queue, 48 .remove = vfio_ap_mdev_remove_queue, 49 .in_use = vfio_ap_mdev_resource_in_use, 50 .on_config_changed = vfio_ap_on_cfg_changed, 51 .on_scan_complete = vfio_ap_on_scan_complete, 52 .ids = ap_queue_ids, 53 }; 54 55 static void vfio_ap_matrix_dev_release(struct device *dev) 56 { 57 struct ap_matrix_dev *matrix_dev; 58 59 matrix_dev = container_of(dev, struct ap_matrix_dev, device); 60 kfree(matrix_dev); 61 } 62 63 static int matrix_bus_match(struct device *dev, struct device_driver *drv) 64 { 65 return 1; 66 } 67 68 static struct bus_type matrix_bus = { 69 .name = "matrix", 70 .match = &matrix_bus_match, 71 }; 72 73 static struct device_driver matrix_driver = { 74 .name = "vfio_ap", 75 .bus = &matrix_bus, 76 .suppress_bind_attrs = true, 77 }; 78 79 static int vfio_ap_matrix_dev_create(void) 80 { 81 int ret; 82 struct device *root_device; 83 84 root_device = root_device_register(VFIO_AP_ROOT_NAME); 85 if (IS_ERR(root_device)) 86 return PTR_ERR(root_device); 87 88 ret = bus_register(&matrix_bus); 89 if (ret) 90 goto bus_register_err; 91 92 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL); 93 if (!matrix_dev) { 94 ret = -ENOMEM; 95 goto matrix_alloc_err; 96 } 97 98 /* Fill in config info via PQAP(QCI), if available */ 99 if (test_facility(12)) { 100 ret = ap_qci(&matrix_dev->info); 101 if (ret) 102 goto matrix_alloc_err; 103 } 104 105 mutex_init(&matrix_dev->mdevs_lock); 106 INIT_LIST_HEAD(&matrix_dev->mdev_list); 107 mutex_init(&matrix_dev->guests_lock); 108 109 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME); 110 matrix_dev->device.parent = root_device; 111 matrix_dev->device.bus = &matrix_bus; 112 matrix_dev->device.release = vfio_ap_matrix_dev_release; 113 matrix_dev->vfio_ap_drv = &vfio_ap_drv; 114 115 ret = device_register(&matrix_dev->device); 116 if (ret) 117 goto matrix_reg_err; 118 119 ret = driver_register(&matrix_driver); 120 if (ret) 121 goto matrix_drv_err; 122 123 return 0; 124 125 matrix_drv_err: 126 device_del(&matrix_dev->device); 127 matrix_reg_err: 128 put_device(&matrix_dev->device); 129 matrix_alloc_err: 130 bus_unregister(&matrix_bus); 131 bus_register_err: 132 root_device_unregister(root_device); 133 return ret; 134 } 135 136 static void vfio_ap_matrix_dev_destroy(void) 137 { 138 struct device *root_device = matrix_dev->device.parent; 139 140 driver_unregister(&matrix_driver); 141 device_unregister(&matrix_dev->device); 142 bus_unregister(&matrix_bus); 143 root_device_unregister(root_device); 144 } 145 146 static int __init vfio_ap_dbf_info_init(void) 147 { 148 vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1, 149 DBF_MAX_SPRINTF_ARGS * sizeof(long)); 150 151 if (!vfio_ap_dbf_info) 152 return -ENOENT; 153 154 debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view); 155 debug_set_level(vfio_ap_dbf_info, DBF_WARN); 156 157 return 0; 158 } 159 160 static int __init vfio_ap_init(void) 161 { 162 int ret; 163 164 ret = vfio_ap_dbf_info_init(); 165 if (ret) 166 return ret; 167 168 /* If there are no AP instructions, there is nothing to pass through. */ 169 if (!ap_instructions_available()) 170 return -ENODEV; 171 172 ret = vfio_ap_matrix_dev_create(); 173 if (ret) 174 return ret; 175 176 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME); 177 if (ret) { 178 vfio_ap_matrix_dev_destroy(); 179 return ret; 180 } 181 182 ret = vfio_ap_mdev_register(); 183 if (ret) { 184 ap_driver_unregister(&vfio_ap_drv); 185 vfio_ap_matrix_dev_destroy(); 186 187 return ret; 188 } 189 190 return 0; 191 } 192 193 static void __exit vfio_ap_exit(void) 194 { 195 vfio_ap_mdev_unregister(); 196 ap_driver_unregister(&vfio_ap_drv); 197 vfio_ap_matrix_dev_destroy(); 198 debug_unregister(vfio_ap_dbf_info); 199 } 200 201 module_init(vfio_ap_init); 202 module_exit(vfio_ap_exit); 203