1 // SPDX-License-Identifier: GPL-2.0 2 /* vio.c: Virtual I/O channel devices probing infrastructure. 3 * 4 * Copyright (c) 2003-2005 IBM Corp. 5 * Dave Engebretsen engebret@us.ibm.com 6 * Santiago Leon santil@us.ibm.com 7 * Hollis Blanchard <hollisb@us.ibm.com> 8 * Stephen Rothwell 9 * 10 * Adapted to sparc64 by David S. Miller davem@davemloft.net 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/irq.h> 16 #include <linux/export.h> 17 #include <linux/init.h> 18 19 #include <asm/mdesc.h> 20 #include <asm/vio.h> 21 vio_match_device(const struct vio_device_id * matches,const struct vio_dev * dev)22 static const struct vio_device_id *vio_match_device( 23 const struct vio_device_id *matches, 24 const struct vio_dev *dev) 25 { 26 const char *type, *compat; 27 int len; 28 29 type = dev->type; 30 compat = dev->compat; 31 len = dev->compat_len; 32 33 while (matches->type[0] || matches->compat[0]) { 34 int match = 1; 35 if (matches->type[0]) 36 match &= !strcmp(matches->type, type); 37 38 if (matches->compat[0]) { 39 match &= len && 40 of_find_in_proplist(compat, matches->compat, len); 41 } 42 if (match) 43 return matches; 44 matches++; 45 } 46 return NULL; 47 } 48 vio_hotplug(struct device * dev,struct kobj_uevent_env * env)49 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) 50 { 51 const struct vio_dev *vio_dev = to_vio_dev(dev); 52 53 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat); 54 return 0; 55 } 56 vio_bus_match(struct device * dev,struct device_driver * drv)57 static int vio_bus_match(struct device *dev, struct device_driver *drv) 58 { 59 struct vio_dev *vio_dev = to_vio_dev(dev); 60 struct vio_driver *vio_drv = to_vio_driver(drv); 61 const struct vio_device_id *matches = vio_drv->id_table; 62 63 if (!matches) 64 return 0; 65 66 return vio_match_device(matches, vio_dev) != NULL; 67 } 68 vio_device_probe(struct device * dev)69 static int vio_device_probe(struct device *dev) 70 { 71 struct vio_dev *vdev = to_vio_dev(dev); 72 struct vio_driver *drv = to_vio_driver(dev->driver); 73 const struct vio_device_id *id; 74 75 if (!drv->probe) 76 return -ENODEV; 77 78 id = vio_match_device(drv->id_table, vdev); 79 if (!id) 80 return -ENODEV; 81 82 /* alloc irqs (unless the driver specified not to) */ 83 if (!drv->no_irq) { 84 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL) 85 vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle, 86 vdev->tx_ino); 87 88 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL) 89 vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle, 90 vdev->rx_ino); 91 } 92 93 return drv->probe(vdev, id); 94 } 95 vio_device_remove(struct device * dev)96 static void vio_device_remove(struct device *dev) 97 { 98 struct vio_dev *vdev = to_vio_dev(dev); 99 struct vio_driver *drv = to_vio_driver(dev->driver); 100 101 if (drv->remove) { 102 /* 103 * Ideally, we would remove/deallocate tx/rx virqs 104 * here - however, there are currently no support 105 * routines to do so at the moment. TBD 106 */ 107 108 drv->remove(vdev); 109 } 110 } 111 devspec_show(struct device * dev,struct device_attribute * attr,char * buf)112 static ssize_t devspec_show(struct device *dev, 113 struct device_attribute *attr, char *buf) 114 { 115 struct vio_dev *vdev = to_vio_dev(dev); 116 const char *str = "none"; 117 118 if (!strcmp(vdev->type, "vnet-port")) 119 str = "vnet"; 120 else if (!strcmp(vdev->type, "vdc-port")) 121 str = "vdisk"; 122 123 return sprintf(buf, "%s\n", str); 124 } 125 static DEVICE_ATTR_RO(devspec); 126 type_show(struct device * dev,struct device_attribute * attr,char * buf)127 static ssize_t type_show(struct device *dev, 128 struct device_attribute *attr, char *buf) 129 { 130 struct vio_dev *vdev = to_vio_dev(dev); 131 return sprintf(buf, "%s\n", vdev->type); 132 } 133 static DEVICE_ATTR_RO(type); 134 modalias_show(struct device * dev,struct device_attribute * attr,char * buf)135 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 136 char *buf) 137 { 138 const struct vio_dev *vdev = to_vio_dev(dev); 139 140 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat); 141 } 142 static DEVICE_ATTR_RO(modalias); 143 144 static struct attribute *vio_dev_attrs[] = { 145 &dev_attr_devspec.attr, 146 &dev_attr_type.attr, 147 &dev_attr_modalias.attr, 148 NULL, 149 }; 150 ATTRIBUTE_GROUPS(vio_dev); 151 152 static struct bus_type vio_bus_type = { 153 .name = "vio", 154 .dev_groups = vio_dev_groups, 155 .uevent = vio_hotplug, 156 .match = vio_bus_match, 157 .probe = vio_device_probe, 158 .remove = vio_device_remove, 159 }; 160 __vio_register_driver(struct vio_driver * viodrv,struct module * owner,const char * mod_name)161 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, 162 const char *mod_name) 163 { 164 viodrv->driver.bus = &vio_bus_type; 165 viodrv->driver.name = viodrv->name; 166 viodrv->driver.owner = owner; 167 viodrv->driver.mod_name = mod_name; 168 169 return driver_register(&viodrv->driver); 170 } 171 EXPORT_SYMBOL(__vio_register_driver); 172 vio_unregister_driver(struct vio_driver * viodrv)173 void vio_unregister_driver(struct vio_driver *viodrv) 174 { 175 driver_unregister(&viodrv->driver); 176 } 177 EXPORT_SYMBOL(vio_unregister_driver); 178 vio_dev_release(struct device * dev)179 static void vio_dev_release(struct device *dev) 180 { 181 kfree(to_vio_dev(dev)); 182 } 183 184 static ssize_t show_pciobppath_attr(struct device * dev,struct device_attribute * attr,char * buf)185 show_pciobppath_attr(struct device *dev, struct device_attribute *attr, 186 char *buf) 187 { 188 struct vio_dev *vdev; 189 struct device_node *dp; 190 191 vdev = to_vio_dev(dev); 192 dp = vdev->dp; 193 194 return scnprintf(buf, PAGE_SIZE, "%pOF\n", dp); 195 } 196 197 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, 198 show_pciobppath_attr, NULL); 199 200 static struct device_node *cdev_node; 201 202 static struct vio_dev *root_vdev; 203 static u64 cdev_cfg_handle; 204 vio_cfg_handle(struct mdesc_handle * hp,u64 node)205 static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node) 206 { 207 const u64 *cfg_handle = NULL; 208 u64 a; 209 210 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 211 u64 target; 212 213 target = mdesc_arc_target(hp, a); 214 cfg_handle = mdesc_get_property(hp, target, 215 "cfg-handle", NULL); 216 if (cfg_handle) 217 break; 218 } 219 220 return cfg_handle; 221 } 222 223 /** 224 * vio_vdev_node() - Find VDEV node in MD 225 * @hp: Handle to the MD 226 * @vdev: Pointer to VDEV 227 * 228 * Find the node in the current MD which matches the given vio_dev. This 229 * must be done dynamically since the node value can change if the MD 230 * is updated. 231 * 232 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine 233 * 234 * Return: The VDEV node in MDESC 235 */ vio_vdev_node(struct mdesc_handle * hp,struct vio_dev * vdev)236 u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev) 237 { 238 u64 node; 239 240 if (vdev == NULL) 241 return MDESC_NODE_NULL; 242 243 node = mdesc_get_node(hp, (const char *)vdev->node_name, 244 &vdev->md_node_info); 245 246 return node; 247 } 248 EXPORT_SYMBOL(vio_vdev_node); 249 vio_fill_channel_info(struct mdesc_handle * hp,u64 mp,struct vio_dev * vdev)250 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, 251 struct vio_dev *vdev) 252 { 253 u64 a; 254 255 vdev->tx_ino = ~0UL; 256 vdev->rx_ino = ~0UL; 257 vdev->channel_id = ~0UL; 258 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 259 const u64 *chan_id; 260 const u64 *irq; 261 u64 target; 262 263 target = mdesc_arc_target(hp, a); 264 265 irq = mdesc_get_property(hp, target, "tx-ino", NULL); 266 if (irq) 267 vdev->tx_ino = *irq; 268 269 irq = mdesc_get_property(hp, target, "rx-ino", NULL); 270 if (irq) 271 vdev->rx_ino = *irq; 272 273 chan_id = mdesc_get_property(hp, target, "id", NULL); 274 if (chan_id) 275 vdev->channel_id = *chan_id; 276 } 277 278 vdev->cdev_handle = cdev_cfg_handle; 279 } 280 vio_set_intr(unsigned long dev_ino,int state)281 int vio_set_intr(unsigned long dev_ino, int state) 282 { 283 int err; 284 285 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state); 286 return err; 287 } 288 EXPORT_SYMBOL(vio_set_intr); 289 vio_create_one(struct mdesc_handle * hp,u64 mp,const char * node_name,struct device * parent)290 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 291 const char *node_name, 292 struct device *parent) 293 { 294 const char *type, *compat; 295 struct device_node *dp; 296 struct vio_dev *vdev; 297 int err, tlen, clen; 298 const u64 *id, *cfg_handle; 299 300 type = mdesc_get_property(hp, mp, "device-type", &tlen); 301 if (!type) { 302 type = mdesc_get_property(hp, mp, "name", &tlen); 303 if (!type) { 304 type = mdesc_node_name(hp, mp); 305 tlen = strlen(type) + 1; 306 } 307 } 308 if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) { 309 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 310 type); 311 return NULL; 312 } 313 314 id = mdesc_get_property(hp, mp, "id", NULL); 315 316 cfg_handle = vio_cfg_handle(hp, mp); 317 318 compat = mdesc_get_property(hp, mp, "device-type", &clen); 319 if (!compat) { 320 clen = 0; 321 } else if (clen > VIO_MAX_COMPAT_LEN) { 322 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 323 clen, type); 324 return NULL; 325 } 326 327 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 328 if (!vdev) { 329 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 330 return NULL; 331 } 332 333 vdev->mp = mp; 334 memcpy(vdev->type, type, tlen); 335 if (compat) 336 memcpy(vdev->compat, compat, clen); 337 else 338 memset(vdev->compat, 0, sizeof(vdev->compat)); 339 vdev->compat_len = clen; 340 341 vdev->port_id = ~0UL; 342 vdev->tx_irq = 0; 343 vdev->rx_irq = 0; 344 345 vio_fill_channel_info(hp, mp, vdev); 346 347 if (!id) { 348 dev_set_name(&vdev->dev, "%s", type); 349 vdev->dev_no = ~(u64)0; 350 } else if (!cfg_handle) { 351 dev_set_name(&vdev->dev, "%s-%llu", type, *id); 352 vdev->dev_no = *id; 353 } else { 354 dev_set_name(&vdev->dev, "%s-%llu-%llu", type, 355 *cfg_handle, *id); 356 vdev->dev_no = *cfg_handle; 357 vdev->port_id = *id; 358 } 359 360 vdev->dev.parent = parent; 361 vdev->dev.bus = &vio_bus_type; 362 vdev->dev.release = vio_dev_release; 363 364 if (parent == NULL) { 365 dp = cdev_node; 366 } else if (to_vio_dev(parent) == root_vdev) { 367 for_each_child_of_node(cdev_node, dp) { 368 if (of_node_is_type(dp, type)) 369 break; 370 } 371 } else { 372 dp = to_vio_dev(parent)->dp; 373 } 374 vdev->dp = dp; 375 376 /* 377 * node_name is NULL for the parent/channel-devices node and 378 * the parent doesn't require the MD node info. 379 */ 380 if (node_name != NULL) { 381 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s", 382 node_name); 383 384 err = mdesc_get_node_info(hp, mp, node_name, 385 &vdev->md_node_info); 386 if (err) { 387 pr_err("VIO: Could not get MD node info %s, err=%d\n", 388 dev_name(&vdev->dev), err); 389 kfree(vdev); 390 return NULL; 391 } 392 } 393 394 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n", 395 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino); 396 397 err = device_register(&vdev->dev); 398 if (err) { 399 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 400 dev_name(&vdev->dev), err); 401 put_device(&vdev->dev); 402 return NULL; 403 } 404 if (vdev->dp) 405 err = sysfs_create_file(&vdev->dev.kobj, 406 &dev_attr_obppath.attr); 407 408 return vdev; 409 } 410 vio_add(struct mdesc_handle * hp,u64 node,const char * node_name)411 static void vio_add(struct mdesc_handle *hp, u64 node, 412 const char *node_name) 413 { 414 (void) vio_create_one(hp, node, node_name, &root_vdev->dev); 415 } 416 417 struct vio_remove_node_data { 418 struct mdesc_handle *hp; 419 u64 node; 420 }; 421 vio_md_node_match(struct device * dev,void * arg)422 static int vio_md_node_match(struct device *dev, void *arg) 423 { 424 struct vio_dev *vdev = to_vio_dev(dev); 425 struct vio_remove_node_data *node_data; 426 u64 node; 427 428 node_data = (struct vio_remove_node_data *)arg; 429 430 node = vio_vdev_node(node_data->hp, vdev); 431 432 if (node == node_data->node) 433 return 1; 434 else 435 return 0; 436 } 437 vio_remove(struct mdesc_handle * hp,u64 node,const char * node_name)438 static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name) 439 { 440 struct vio_remove_node_data node_data; 441 struct device *dev; 442 443 node_data.hp = hp; 444 node_data.node = node; 445 446 dev = device_find_child(&root_vdev->dev, (void *)&node_data, 447 vio_md_node_match); 448 if (dev) { 449 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 450 451 device_unregister(dev); 452 put_device(dev); 453 } else { 454 pr_err("VIO: %s node not found in MDESC\n", node_name); 455 } 456 } 457 458 static struct mdesc_notifier_client vio_device_notifier = { 459 .add = vio_add, 460 .remove = vio_remove, 461 .node_name = "virtual-device-port", 462 }; 463 464 /* We are only interested in domain service ports under the 465 * "domain-services" node. On control nodes there is another port 466 * under "openboot" that we should not mess with as aparently that is 467 * reserved exclusively for OBP use. 468 */ vio_add_ds(struct mdesc_handle * hp,u64 node,const char * node_name)469 static void vio_add_ds(struct mdesc_handle *hp, u64 node, 470 const char *node_name) 471 { 472 int found; 473 u64 a; 474 475 found = 0; 476 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 477 u64 target = mdesc_arc_target(hp, a); 478 const char *name = mdesc_node_name(hp, target); 479 480 if (!strcmp(name, "domain-services")) { 481 found = 1; 482 break; 483 } 484 } 485 486 if (found) 487 (void) vio_create_one(hp, node, node_name, &root_vdev->dev); 488 } 489 490 static struct mdesc_notifier_client vio_ds_notifier = { 491 .add = vio_add_ds, 492 .remove = vio_remove, 493 .node_name = "domain-services-port", 494 }; 495 496 static const char *channel_devices_node = "channel-devices"; 497 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 498 static const char *cfg_handle_prop = "cfg-handle"; 499 vio_init(void)500 static int __init vio_init(void) 501 { 502 struct mdesc_handle *hp; 503 const char *compat; 504 const u64 *cfg_handle; 505 int err, len; 506 u64 root; 507 508 err = bus_register(&vio_bus_type); 509 if (err) { 510 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 511 err); 512 return err; 513 } 514 515 hp = mdesc_grab(); 516 if (!hp) 517 return 0; 518 519 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 520 if (root == MDESC_NODE_NULL) { 521 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 522 mdesc_release(hp); 523 return 0; 524 } 525 526 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 527 err = -ENODEV; 528 if (!cdev_node) { 529 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 530 goto out_release; 531 } 532 533 compat = mdesc_get_property(hp, root, "compatible", &len); 534 if (!compat) { 535 printk(KERN_ERR "VIO: Channel devices lacks compatible " 536 "property\n"); 537 goto out_release; 538 } 539 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 540 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 541 "compat entry.\n", channel_devices_compat); 542 goto out_release; 543 } 544 545 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 546 if (!cfg_handle) { 547 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 548 cfg_handle_prop); 549 goto out_release; 550 } 551 552 cdev_cfg_handle = *cfg_handle; 553 554 root_vdev = vio_create_one(hp, root, NULL, NULL); 555 err = -ENODEV; 556 if (!root_vdev) { 557 printk(KERN_ERR "VIO: Could not create root device.\n"); 558 goto out_release; 559 } 560 561 mdesc_register_notifier(&vio_device_notifier); 562 mdesc_register_notifier(&vio_ds_notifier); 563 564 mdesc_release(hp); 565 566 return err; 567 568 out_release: 569 mdesc_release(hp); 570 return err; 571 } 572 573 postcore_initcall(vio_init); 574