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/slab.h> 14 #include <linux/irq.h> 15 #include <linux/export.h> 16 #include <linux/init.h> 17 18 #include <asm/mdesc.h> 19 #include <asm/vio.h> 20 21 static const struct vio_device_id *vio_match_device( 22 const struct vio_device_id *matches, 23 const struct vio_dev *dev) 24 { 25 const char *type, *compat; 26 int len; 27 28 type = dev->type; 29 compat = dev->compat; 30 len = dev->compat_len; 31 32 while (matches->type[0] || matches->compat[0]) { 33 int match = 1; 34 if (matches->type[0]) 35 match &= !strcmp(matches->type, type); 36 37 if (matches->compat[0]) { 38 match &= len && 39 of_find_in_proplist(compat, matches->compat, len); 40 } 41 if (match) 42 return matches; 43 matches++; 44 } 45 return NULL; 46 } 47 48 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) 49 { 50 const struct vio_dev *vio_dev = to_vio_dev(dev); 51 52 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat); 53 return 0; 54 } 55 56 static int vio_bus_match(struct device *dev, struct device_driver *drv) 57 { 58 struct vio_dev *vio_dev = to_vio_dev(dev); 59 struct vio_driver *vio_drv = to_vio_driver(drv); 60 const struct vio_device_id *matches = vio_drv->id_table; 61 62 if (!matches) 63 return 0; 64 65 return vio_match_device(matches, vio_dev) != NULL; 66 } 67 68 static int vio_device_probe(struct device *dev) 69 { 70 struct vio_dev *vdev = to_vio_dev(dev); 71 struct vio_driver *drv = to_vio_driver(dev->driver); 72 const struct vio_device_id *id; 73 int error = -ENODEV; 74 75 if (drv->probe) { 76 id = vio_match_device(drv->id_table, vdev); 77 if (id) 78 error = drv->probe(vdev, id); 79 } 80 81 return error; 82 } 83 84 static int vio_device_remove(struct device *dev) 85 { 86 struct vio_dev *vdev = to_vio_dev(dev); 87 struct vio_driver *drv = to_vio_driver(dev->driver); 88 89 if (drv->remove) 90 return drv->remove(vdev); 91 92 return 1; 93 } 94 95 static ssize_t devspec_show(struct device *dev, 96 struct device_attribute *attr, char *buf) 97 { 98 struct vio_dev *vdev = to_vio_dev(dev); 99 const char *str = "none"; 100 101 if (!strcmp(vdev->type, "vnet-port")) 102 str = "vnet"; 103 else if (!strcmp(vdev->type, "vdc-port")) 104 str = "vdisk"; 105 106 return sprintf(buf, "%s\n", str); 107 } 108 109 static ssize_t type_show(struct device *dev, 110 struct device_attribute *attr, char *buf) 111 { 112 struct vio_dev *vdev = to_vio_dev(dev); 113 return sprintf(buf, "%s\n", vdev->type); 114 } 115 116 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 117 char *buf) 118 { 119 const struct vio_dev *vdev = to_vio_dev(dev); 120 121 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat); 122 } 123 124 static struct device_attribute vio_dev_attrs[] = { 125 __ATTR_RO(devspec), 126 __ATTR_RO(type), 127 __ATTR_RO(modalias), 128 __ATTR_NULL 129 }; 130 131 static struct bus_type vio_bus_type = { 132 .name = "vio", 133 .dev_attrs = vio_dev_attrs, 134 .uevent = vio_hotplug, 135 .match = vio_bus_match, 136 .probe = vio_device_probe, 137 .remove = vio_device_remove, 138 }; 139 140 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, 141 const char *mod_name) 142 { 143 viodrv->driver.bus = &vio_bus_type; 144 viodrv->driver.name = viodrv->name; 145 viodrv->driver.owner = owner; 146 viodrv->driver.mod_name = mod_name; 147 148 return driver_register(&viodrv->driver); 149 } 150 EXPORT_SYMBOL(__vio_register_driver); 151 152 void vio_unregister_driver(struct vio_driver *viodrv) 153 { 154 driver_unregister(&viodrv->driver); 155 } 156 EXPORT_SYMBOL(vio_unregister_driver); 157 158 static void vio_dev_release(struct device *dev) 159 { 160 kfree(to_vio_dev(dev)); 161 } 162 163 static ssize_t 164 show_pciobppath_attr(struct device *dev, struct device_attribute *attr, 165 char *buf) 166 { 167 struct vio_dev *vdev; 168 struct device_node *dp; 169 170 vdev = to_vio_dev(dev); 171 dp = vdev->dp; 172 173 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); 174 } 175 176 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, 177 show_pciobppath_attr, NULL); 178 179 static struct device_node *cdev_node; 180 181 static struct vio_dev *root_vdev; 182 static u64 cdev_cfg_handle; 183 184 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, 185 struct vio_dev *vdev) 186 { 187 u64 a; 188 189 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 190 const u64 *chan_id; 191 const u64 *irq; 192 u64 target; 193 194 target = mdesc_arc_target(hp, a); 195 196 irq = mdesc_get_property(hp, target, "tx-ino", NULL); 197 if (irq) 198 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 199 200 irq = mdesc_get_property(hp, target, "rx-ino", NULL); 201 if (irq) { 202 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 203 vdev->rx_ino = *irq; 204 } 205 206 chan_id = mdesc_get_property(hp, target, "id", NULL); 207 if (chan_id) 208 vdev->channel_id = *chan_id; 209 } 210 } 211 212 int vio_set_intr(unsigned long dev_ino, int state) 213 { 214 int err; 215 216 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state); 217 return err; 218 } 219 EXPORT_SYMBOL(vio_set_intr); 220 221 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 222 struct device *parent) 223 { 224 const char *type, *compat, *bus_id_name; 225 struct device_node *dp; 226 struct vio_dev *vdev; 227 int err, tlen, clen; 228 const u64 *id, *cfg_handle; 229 u64 a; 230 231 type = mdesc_get_property(hp, mp, "device-type", &tlen); 232 if (!type) { 233 type = mdesc_get_property(hp, mp, "name", &tlen); 234 if (!type) { 235 type = mdesc_node_name(hp, mp); 236 tlen = strlen(type) + 1; 237 } 238 } 239 if (tlen > VIO_MAX_TYPE_LEN) { 240 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 241 type); 242 return NULL; 243 } 244 245 id = mdesc_get_property(hp, mp, "id", NULL); 246 247 cfg_handle = NULL; 248 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 249 u64 target; 250 251 target = mdesc_arc_target(hp, a); 252 cfg_handle = mdesc_get_property(hp, target, 253 "cfg-handle", NULL); 254 if (cfg_handle) 255 break; 256 } 257 258 bus_id_name = type; 259 if (!strcmp(type, "domain-services-port")) 260 bus_id_name = "ds"; 261 262 /* 263 * 20 char is the old driver-core name size limit, which is no more. 264 * This check can probably be removed after review and possible 265 * adaption of the vio users name length handling. 266 */ 267 if (strlen(bus_id_name) >= 20 - 4) { 268 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", 269 bus_id_name); 270 return NULL; 271 } 272 273 compat = mdesc_get_property(hp, mp, "device-type", &clen); 274 if (!compat) { 275 clen = 0; 276 } else if (clen > VIO_MAX_COMPAT_LEN) { 277 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 278 clen, type); 279 return NULL; 280 } 281 282 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 283 if (!vdev) { 284 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 285 return NULL; 286 } 287 288 vdev->mp = mp; 289 memcpy(vdev->type, type, tlen); 290 if (compat) 291 memcpy(vdev->compat, compat, clen); 292 else 293 memset(vdev->compat, 0, sizeof(vdev->compat)); 294 vdev->compat_len = clen; 295 296 vdev->channel_id = ~0UL; 297 vdev->tx_irq = ~0; 298 vdev->rx_irq = ~0; 299 300 vio_fill_channel_info(hp, mp, vdev); 301 302 if (!id) { 303 dev_set_name(&vdev->dev, "%s", bus_id_name); 304 vdev->dev_no = ~(u64)0; 305 vdev->id = ~(u64)0; 306 } else if (!cfg_handle) { 307 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); 308 vdev->dev_no = *id; 309 vdev->id = ~(u64)0; 310 } else { 311 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, 312 *cfg_handle, *id); 313 vdev->dev_no = *cfg_handle; 314 vdev->id = *id; 315 } 316 317 vdev->dev.parent = parent; 318 vdev->dev.bus = &vio_bus_type; 319 vdev->dev.release = vio_dev_release; 320 321 if (parent == NULL) { 322 dp = cdev_node; 323 } else if (to_vio_dev(parent) == root_vdev) { 324 dp = of_get_next_child(cdev_node, NULL); 325 while (dp) { 326 if (!strcmp(dp->type, type)) 327 break; 328 329 dp = of_get_next_child(cdev_node, dp); 330 } 331 } else { 332 dp = to_vio_dev(parent)->dp; 333 } 334 vdev->dp = dp; 335 336 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); 337 338 err = device_register(&vdev->dev); 339 if (err) { 340 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 341 dev_name(&vdev->dev), err); 342 kfree(vdev); 343 return NULL; 344 } 345 if (vdev->dp) 346 err = sysfs_create_file(&vdev->dev.kobj, 347 &dev_attr_obppath.attr); 348 349 return vdev; 350 } 351 352 static void vio_add(struct mdesc_handle *hp, u64 node) 353 { 354 (void) vio_create_one(hp, node, &root_vdev->dev); 355 } 356 357 struct vio_md_node_query { 358 const char *type; 359 u64 dev_no; 360 u64 id; 361 }; 362 363 static int vio_md_node_match(struct device *dev, void *arg) 364 { 365 struct vio_md_node_query *query = (struct vio_md_node_query *) arg; 366 struct vio_dev *vdev = to_vio_dev(dev); 367 368 if (vdev->dev_no != query->dev_no) 369 return 0; 370 if (vdev->id != query->id) 371 return 0; 372 if (strcmp(vdev->type, query->type)) 373 return 0; 374 375 return 1; 376 } 377 378 static void vio_remove(struct mdesc_handle *hp, u64 node) 379 { 380 const char *type; 381 const u64 *id, *cfg_handle; 382 u64 a; 383 struct vio_md_node_query query; 384 struct device *dev; 385 386 type = mdesc_get_property(hp, node, "device-type", NULL); 387 if (!type) { 388 type = mdesc_get_property(hp, node, "name", NULL); 389 if (!type) 390 type = mdesc_node_name(hp, node); 391 } 392 393 query.type = type; 394 395 id = mdesc_get_property(hp, node, "id", NULL); 396 cfg_handle = NULL; 397 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 398 u64 target; 399 400 target = mdesc_arc_target(hp, a); 401 cfg_handle = mdesc_get_property(hp, target, 402 "cfg-handle", NULL); 403 if (cfg_handle) 404 break; 405 } 406 407 if (!id) { 408 query.dev_no = ~(u64)0; 409 query.id = ~(u64)0; 410 } else if (!cfg_handle) { 411 query.dev_no = *id; 412 query.id = ~(u64)0; 413 } else { 414 query.dev_no = *cfg_handle; 415 query.id = *id; 416 } 417 418 dev = device_find_child(&root_vdev->dev, &query, 419 vio_md_node_match); 420 if (dev) { 421 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 422 423 device_unregister(dev); 424 put_device(dev); 425 } else { 426 if (!id) 427 printk(KERN_ERR "VIO: Removed unknown %s node.\n", 428 type); 429 else if (!cfg_handle) 430 printk(KERN_ERR "VIO: Removed unknown %s node %llu.\n", 431 type, *id); 432 else 433 printk(KERN_ERR "VIO: Removed unknown %s node %llu-%llu.\n", 434 type, *cfg_handle, *id); 435 } 436 } 437 438 static struct mdesc_notifier_client vio_device_notifier = { 439 .add = vio_add, 440 .remove = vio_remove, 441 .node_name = "virtual-device-port", 442 }; 443 444 /* We are only interested in domain service ports under the 445 * "domain-services" node. On control nodes there is another port 446 * under "openboot" that we should not mess with as aparently that is 447 * reserved exclusively for OBP use. 448 */ 449 static void vio_add_ds(struct mdesc_handle *hp, u64 node) 450 { 451 int found; 452 u64 a; 453 454 found = 0; 455 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 456 u64 target = mdesc_arc_target(hp, a); 457 const char *name = mdesc_node_name(hp, target); 458 459 if (!strcmp(name, "domain-services")) { 460 found = 1; 461 break; 462 } 463 } 464 465 if (found) 466 (void) vio_create_one(hp, node, &root_vdev->dev); 467 } 468 469 static struct mdesc_notifier_client vio_ds_notifier = { 470 .add = vio_add_ds, 471 .remove = vio_remove, 472 .node_name = "domain-services-port", 473 }; 474 475 static const char *channel_devices_node = "channel-devices"; 476 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 477 static const char *cfg_handle_prop = "cfg-handle"; 478 479 static int __init vio_init(void) 480 { 481 struct mdesc_handle *hp; 482 const char *compat; 483 const u64 *cfg_handle; 484 int err, len; 485 u64 root; 486 487 err = bus_register(&vio_bus_type); 488 if (err) { 489 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 490 err); 491 return err; 492 } 493 494 hp = mdesc_grab(); 495 if (!hp) 496 return 0; 497 498 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 499 if (root == MDESC_NODE_NULL) { 500 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 501 mdesc_release(hp); 502 return 0; 503 } 504 505 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 506 err = -ENODEV; 507 if (!cdev_node) { 508 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 509 goto out_release; 510 } 511 512 compat = mdesc_get_property(hp, root, "compatible", &len); 513 if (!compat) { 514 printk(KERN_ERR "VIO: Channel devices lacks compatible " 515 "property\n"); 516 goto out_release; 517 } 518 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 519 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 520 "compat entry.\n", channel_devices_compat); 521 goto out_release; 522 } 523 524 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 525 if (!cfg_handle) { 526 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 527 cfg_handle_prop); 528 goto out_release; 529 } 530 531 cdev_cfg_handle = *cfg_handle; 532 533 root_vdev = vio_create_one(hp, root, NULL); 534 err = -ENODEV; 535 if (!root_vdev) { 536 printk(KERN_ERR "VIO: Could not create root device.\n"); 537 goto out_release; 538 } 539 540 mdesc_register_notifier(&vio_device_notifier); 541 mdesc_register_notifier(&vio_ds_notifier); 542 543 mdesc_release(hp); 544 545 return err; 546 547 out_release: 548 mdesc_release(hp); 549 return err; 550 } 551 552 postcore_initcall(vio_init); 553