1 /* vio.c: Virtual I/O channel devices probing infrastructure. 2 * 3 * Copyright (c) 2003-2005 IBM Corp. 4 * Dave Engebretsen engebret@us.ibm.com 5 * Santiago Leon santil@us.ibm.com 6 * Hollis Blanchard <hollisb@us.ibm.com> 7 * Stephen Rothwell 8 * 9 * Adapted to sparc64 by David S. Miller davem@davemloft.net 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/irq.h> 14 #include <linux/init.h> 15 16 #include <asm/mdesc.h> 17 #include <asm/vio.h> 18 19 static const struct vio_device_id *vio_match_device( 20 const struct vio_device_id *matches, 21 const struct vio_dev *dev) 22 { 23 const char *type, *compat; 24 int len; 25 26 type = dev->type; 27 compat = dev->compat; 28 len = dev->compat_len; 29 30 while (matches->type[0] || matches->compat[0]) { 31 int match = 1; 32 if (matches->type[0]) 33 match &= !strcmp(matches->type, type); 34 35 if (matches->compat[0]) { 36 match &= len && 37 of_find_in_proplist(compat, matches->compat, len); 38 } 39 if (match) 40 return matches; 41 matches++; 42 } 43 return NULL; 44 } 45 46 static int vio_bus_match(struct device *dev, struct device_driver *drv) 47 { 48 struct vio_dev *vio_dev = to_vio_dev(dev); 49 struct vio_driver *vio_drv = to_vio_driver(drv); 50 const struct vio_device_id *matches = vio_drv->id_table; 51 52 if (!matches) 53 return 0; 54 55 return vio_match_device(matches, vio_dev) != NULL; 56 } 57 58 static int vio_device_probe(struct device *dev) 59 { 60 struct vio_dev *vdev = to_vio_dev(dev); 61 struct vio_driver *drv = to_vio_driver(dev->driver); 62 const struct vio_device_id *id; 63 int error = -ENODEV; 64 65 if (drv->probe) { 66 id = vio_match_device(drv->id_table, vdev); 67 if (id) 68 error = drv->probe(vdev, id); 69 } 70 71 return error; 72 } 73 74 static int vio_device_remove(struct device *dev) 75 { 76 struct vio_dev *vdev = to_vio_dev(dev); 77 struct vio_driver *drv = to_vio_driver(dev->driver); 78 79 if (drv->remove) 80 return drv->remove(vdev); 81 82 return 1; 83 } 84 85 static ssize_t devspec_show(struct device *dev, 86 struct device_attribute *attr, char *buf) 87 { 88 struct vio_dev *vdev = to_vio_dev(dev); 89 const char *str = "none"; 90 91 if (!strcmp(vdev->type, "vnet-port")) 92 str = "vnet"; 93 else if (!strcmp(vdev->type, "vdc-port")) 94 str = "vdisk"; 95 96 return sprintf(buf, "%s\n", str); 97 } 98 99 static ssize_t type_show(struct device *dev, 100 struct device_attribute *attr, char *buf) 101 { 102 struct vio_dev *vdev = to_vio_dev(dev); 103 return sprintf(buf, "%s\n", vdev->type); 104 } 105 106 static struct device_attribute vio_dev_attrs[] = { 107 __ATTR_RO(devspec), 108 __ATTR_RO(type), 109 __ATTR_NULL 110 }; 111 112 static struct bus_type vio_bus_type = { 113 .name = "vio", 114 .dev_attrs = vio_dev_attrs, 115 .match = vio_bus_match, 116 .probe = vio_device_probe, 117 .remove = vio_device_remove, 118 }; 119 120 int vio_register_driver(struct vio_driver *viodrv) 121 { 122 viodrv->driver.bus = &vio_bus_type; 123 124 return driver_register(&viodrv->driver); 125 } 126 EXPORT_SYMBOL(vio_register_driver); 127 128 void vio_unregister_driver(struct vio_driver *viodrv) 129 { 130 driver_unregister(&viodrv->driver); 131 } 132 EXPORT_SYMBOL(vio_unregister_driver); 133 134 static void vio_dev_release(struct device *dev) 135 { 136 kfree(to_vio_dev(dev)); 137 } 138 139 static ssize_t 140 show_pciobppath_attr(struct device *dev, struct device_attribute *attr, 141 char *buf) 142 { 143 struct vio_dev *vdev; 144 struct device_node *dp; 145 146 vdev = to_vio_dev(dev); 147 dp = vdev->dp; 148 149 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); 150 } 151 152 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, 153 show_pciobppath_attr, NULL); 154 155 static struct device_node *cdev_node; 156 157 static struct vio_dev *root_vdev; 158 static u64 cdev_cfg_handle; 159 160 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, 161 struct vio_dev *vdev) 162 { 163 u64 a; 164 165 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 166 const u64 *chan_id; 167 const u64 *irq; 168 u64 target; 169 170 target = mdesc_arc_target(hp, a); 171 172 irq = mdesc_get_property(hp, target, "tx-ino", NULL); 173 if (irq) 174 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 175 176 irq = mdesc_get_property(hp, target, "rx-ino", NULL); 177 if (irq) 178 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 179 180 chan_id = mdesc_get_property(hp, target, "id", NULL); 181 if (chan_id) 182 vdev->channel_id = *chan_id; 183 } 184 } 185 186 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 187 struct device *parent) 188 { 189 const char *type, *compat, *bus_id_name; 190 struct device_node *dp; 191 struct vio_dev *vdev; 192 int err, tlen, clen; 193 const u64 *id, *cfg_handle; 194 u64 a; 195 196 type = mdesc_get_property(hp, mp, "device-type", &tlen); 197 if (!type) { 198 type = mdesc_get_property(hp, mp, "name", &tlen); 199 if (!type) { 200 type = mdesc_node_name(hp, mp); 201 tlen = strlen(type) + 1; 202 } 203 } 204 if (tlen > VIO_MAX_TYPE_LEN) { 205 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 206 type); 207 return NULL; 208 } 209 210 id = mdesc_get_property(hp, mp, "id", NULL); 211 212 cfg_handle = NULL; 213 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 214 u64 target; 215 216 target = mdesc_arc_target(hp, a); 217 cfg_handle = mdesc_get_property(hp, target, 218 "cfg-handle", NULL); 219 if (cfg_handle) 220 break; 221 } 222 223 bus_id_name = type; 224 if (!strcmp(type, "domain-services-port")) 225 bus_id_name = "ds"; 226 227 if (strlen(bus_id_name) >= BUS_ID_SIZE - 4) { 228 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", 229 bus_id_name); 230 return NULL; 231 } 232 233 compat = mdesc_get_property(hp, mp, "device-type", &clen); 234 if (!compat) { 235 clen = 0; 236 } else if (clen > VIO_MAX_COMPAT_LEN) { 237 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 238 clen, type); 239 return NULL; 240 } 241 242 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 243 if (!vdev) { 244 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 245 return NULL; 246 } 247 248 vdev->mp = mp; 249 memcpy(vdev->type, type, tlen); 250 if (compat) 251 memcpy(vdev->compat, compat, clen); 252 else 253 memset(vdev->compat, 0, sizeof(vdev->compat)); 254 vdev->compat_len = clen; 255 256 vdev->channel_id = ~0UL; 257 vdev->tx_irq = ~0; 258 vdev->rx_irq = ~0; 259 260 vio_fill_channel_info(hp, mp, vdev); 261 262 if (!id) { 263 dev_set_name(&vdev->dev, "%s", bus_id_name); 264 vdev->dev_no = ~(u64)0; 265 } else if (!cfg_handle) { 266 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); 267 vdev->dev_no = *id; 268 } else { 269 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, 270 *cfg_handle, *id); 271 vdev->dev_no = *cfg_handle; 272 } 273 274 vdev->dev.parent = parent; 275 vdev->dev.bus = &vio_bus_type; 276 vdev->dev.release = vio_dev_release; 277 278 if (parent == NULL) { 279 dp = cdev_node; 280 } else if (to_vio_dev(parent) == root_vdev) { 281 dp = of_get_next_child(cdev_node, NULL); 282 while (dp) { 283 if (!strcmp(dp->type, type)) 284 break; 285 286 dp = of_get_next_child(cdev_node, dp); 287 } 288 } else { 289 dp = to_vio_dev(parent)->dp; 290 } 291 vdev->dp = dp; 292 293 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); 294 295 err = device_register(&vdev->dev); 296 if (err) { 297 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 298 dev_name(&vdev->dev), err); 299 kfree(vdev); 300 return NULL; 301 } 302 if (vdev->dp) 303 err = sysfs_create_file(&vdev->dev.kobj, 304 &dev_attr_obppath.attr); 305 306 return vdev; 307 } 308 309 static void vio_add(struct mdesc_handle *hp, u64 node) 310 { 311 (void) vio_create_one(hp, node, &root_vdev->dev); 312 } 313 314 static int vio_md_node_match(struct device *dev, void *arg) 315 { 316 struct vio_dev *vdev = to_vio_dev(dev); 317 318 if (vdev->mp == (u64) arg) 319 return 1; 320 321 return 0; 322 } 323 324 static void vio_remove(struct mdesc_handle *hp, u64 node) 325 { 326 struct device *dev; 327 328 dev = device_find_child(&root_vdev->dev, (void *) node, 329 vio_md_node_match); 330 if (dev) { 331 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 332 333 device_unregister(dev); 334 } 335 } 336 337 static struct mdesc_notifier_client vio_device_notifier = { 338 .add = vio_add, 339 .remove = vio_remove, 340 .node_name = "virtual-device-port", 341 }; 342 343 /* We are only interested in domain service ports under the 344 * "domain-services" node. On control nodes there is another port 345 * under "openboot" that we should not mess with as aparently that is 346 * reserved exclusively for OBP use. 347 */ 348 static void vio_add_ds(struct mdesc_handle *hp, u64 node) 349 { 350 int found; 351 u64 a; 352 353 found = 0; 354 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 355 u64 target = mdesc_arc_target(hp, a); 356 const char *name = mdesc_node_name(hp, target); 357 358 if (!strcmp(name, "domain-services")) { 359 found = 1; 360 break; 361 } 362 } 363 364 if (found) 365 (void) vio_create_one(hp, node, &root_vdev->dev); 366 } 367 368 static struct mdesc_notifier_client vio_ds_notifier = { 369 .add = vio_add_ds, 370 .remove = vio_remove, 371 .node_name = "domain-services-port", 372 }; 373 374 static const char *channel_devices_node = "channel-devices"; 375 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 376 static const char *cfg_handle_prop = "cfg-handle"; 377 378 static int __init vio_init(void) 379 { 380 struct mdesc_handle *hp; 381 const char *compat; 382 const u64 *cfg_handle; 383 int err, len; 384 u64 root; 385 386 err = bus_register(&vio_bus_type); 387 if (err) { 388 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 389 err); 390 return err; 391 } 392 393 hp = mdesc_grab(); 394 if (!hp) 395 return 0; 396 397 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 398 if (root == MDESC_NODE_NULL) { 399 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 400 mdesc_release(hp); 401 return 0; 402 } 403 404 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 405 err = -ENODEV; 406 if (!cdev_node) { 407 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 408 goto out_release; 409 } 410 411 compat = mdesc_get_property(hp, root, "compatible", &len); 412 if (!compat) { 413 printk(KERN_ERR "VIO: Channel devices lacks compatible " 414 "property\n"); 415 goto out_release; 416 } 417 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 418 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 419 "compat entry.\n", channel_devices_compat); 420 goto out_release; 421 } 422 423 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 424 if (!cfg_handle) { 425 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 426 cfg_handle_prop); 427 goto out_release; 428 } 429 430 cdev_cfg_handle = *cfg_handle; 431 432 root_vdev = vio_create_one(hp, root, NULL); 433 err = -ENODEV; 434 if (!root_vdev) { 435 printk(KERN_ERR "VIO: Coult not create root device.\n"); 436 goto out_release; 437 } 438 439 mdesc_register_notifier(&vio_device_notifier); 440 mdesc_register_notifier(&vio_ds_notifier); 441 442 mdesc_release(hp); 443 444 return err; 445 446 out_release: 447 mdesc_release(hp); 448 return err; 449 } 450 451 postcore_initcall(vio_init); 452