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 = dev_get_drvdata(dev); 58 59 kfree(matrix_dev); 60 } 61 62 static int matrix_bus_match(struct device *dev, struct device_driver *drv) 63 { 64 return 1; 65 } 66 67 static struct bus_type matrix_bus = { 68 .name = "matrix", 69 .match = &matrix_bus_match, 70 }; 71 72 static struct device_driver matrix_driver = { 73 .name = "vfio_ap", 74 .bus = &matrix_bus, 75 .suppress_bind_attrs = true, 76 }; 77 78 static int vfio_ap_matrix_dev_create(void) 79 { 80 int ret; 81 struct device *root_device; 82 83 root_device = root_device_register(VFIO_AP_ROOT_NAME); 84 if (IS_ERR(root_device)) 85 return PTR_ERR(root_device); 86 87 ret = bus_register(&matrix_bus); 88 if (ret) 89 goto bus_register_err; 90 91 matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL); 92 if (!matrix_dev) { 93 ret = -ENOMEM; 94 goto matrix_alloc_err; 95 } 96 97 /* Fill in config info via PQAP(QCI), if available */ 98 if (test_facility(12)) { 99 ret = ap_qci(&matrix_dev->info); 100 if (ret) 101 goto matrix_alloc_err; 102 } 103 104 mutex_init(&matrix_dev->mdevs_lock); 105 INIT_LIST_HEAD(&matrix_dev->mdev_list); 106 mutex_init(&matrix_dev->guests_lock); 107 108 dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME); 109 matrix_dev->device.parent = root_device; 110 matrix_dev->device.bus = &matrix_bus; 111 matrix_dev->device.release = vfio_ap_matrix_dev_release; 112 matrix_dev->vfio_ap_drv = &vfio_ap_drv; 113 114 ret = device_register(&matrix_dev->device); 115 if (ret) 116 goto matrix_reg_err; 117 118 ret = driver_register(&matrix_driver); 119 if (ret) 120 goto matrix_drv_err; 121 122 return 0; 123 124 matrix_drv_err: 125 device_del(&matrix_dev->device); 126 matrix_reg_err: 127 put_device(&matrix_dev->device); 128 matrix_alloc_err: 129 bus_unregister(&matrix_bus); 130 bus_register_err: 131 root_device_unregister(root_device); 132 return ret; 133 } 134 135 static void vfio_ap_matrix_dev_destroy(void) 136 { 137 struct device *root_device = matrix_dev->device.parent; 138 139 driver_unregister(&matrix_driver); 140 device_unregister(&matrix_dev->device); 141 bus_unregister(&matrix_bus); 142 root_device_unregister(root_device); 143 } 144 145 static int __init vfio_ap_dbf_info_init(void) 146 { 147 vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1, 148 DBF_MAX_SPRINTF_ARGS * sizeof(long)); 149 150 if (!vfio_ap_dbf_info) 151 return -ENOENT; 152 153 debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view); 154 debug_set_level(vfio_ap_dbf_info, DBF_WARN); 155 156 return 0; 157 } 158 159 static int __init vfio_ap_init(void) 160 { 161 int ret; 162 163 ret = vfio_ap_dbf_info_init(); 164 if (ret) 165 return ret; 166 167 /* If there are no AP instructions, there is nothing to pass through. */ 168 if (!ap_instructions_available()) 169 return -ENODEV; 170 171 ret = vfio_ap_matrix_dev_create(); 172 if (ret) 173 return ret; 174 175 ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME); 176 if (ret) { 177 vfio_ap_matrix_dev_destroy(); 178 return ret; 179 } 180 181 ret = vfio_ap_mdev_register(); 182 if (ret) { 183 ap_driver_unregister(&vfio_ap_drv); 184 vfio_ap_matrix_dev_destroy(); 185 186 return ret; 187 } 188 189 return 0; 190 } 191 192 static void __exit vfio_ap_exit(void) 193 { 194 vfio_ap_mdev_unregister(); 195 ap_driver_unregister(&vfio_ap_drv); 196 vfio_ap_matrix_dev_destroy(); 197 debug_unregister(vfio_ap_dbf_info); 198 } 199 200 module_init(vfio_ap_init); 201 module_exit(vfio_ap_exit); 202