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 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 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 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 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 96 static int 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 return drv->remove(vdev); 109 } 110 111 return 1; 112 } 113 114 static ssize_t devspec_show(struct device *dev, 115 struct device_attribute *attr, char *buf) 116 { 117 struct vio_dev *vdev = to_vio_dev(dev); 118 const char *str = "none"; 119 120 if (!strcmp(vdev->type, "vnet-port")) 121 str = "vnet"; 122 else if (!strcmp(vdev->type, "vdc-port")) 123 str = "vdisk"; 124 125 return sprintf(buf, "%s\n", str); 126 } 127 static DEVICE_ATTR_RO(devspec); 128 129 static ssize_t type_show(struct device *dev, 130 struct device_attribute *attr, char *buf) 131 { 132 struct vio_dev *vdev = to_vio_dev(dev); 133 return sprintf(buf, "%s\n", vdev->type); 134 } 135 static DEVICE_ATTR_RO(type); 136 137 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 138 char *buf) 139 { 140 const struct vio_dev *vdev = to_vio_dev(dev); 141 142 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat); 143 } 144 static DEVICE_ATTR_RO(modalias); 145 146 static struct attribute *vio_dev_attrs[] = { 147 &dev_attr_devspec.attr, 148 &dev_attr_type.attr, 149 &dev_attr_modalias.attr, 150 NULL, 151 }; 152 ATTRIBUTE_GROUPS(vio_dev); 153 154 static struct bus_type vio_bus_type = { 155 .name = "vio", 156 .dev_groups = vio_dev_groups, 157 .uevent = vio_hotplug, 158 .match = vio_bus_match, 159 .probe = vio_device_probe, 160 .remove = vio_device_remove, 161 }; 162 163 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, 164 const char *mod_name) 165 { 166 viodrv->driver.bus = &vio_bus_type; 167 viodrv->driver.name = viodrv->name; 168 viodrv->driver.owner = owner; 169 viodrv->driver.mod_name = mod_name; 170 171 return driver_register(&viodrv->driver); 172 } 173 EXPORT_SYMBOL(__vio_register_driver); 174 175 void vio_unregister_driver(struct vio_driver *viodrv) 176 { 177 driver_unregister(&viodrv->driver); 178 } 179 EXPORT_SYMBOL(vio_unregister_driver); 180 181 static void vio_dev_release(struct device *dev) 182 { 183 kfree(to_vio_dev(dev)); 184 } 185 186 static ssize_t 187 show_pciobppath_attr(struct device *dev, struct device_attribute *attr, 188 char *buf) 189 { 190 struct vio_dev *vdev; 191 struct device_node *dp; 192 193 vdev = to_vio_dev(dev); 194 dp = vdev->dp; 195 196 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); 197 } 198 199 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, 200 show_pciobppath_attr, NULL); 201 202 static struct device_node *cdev_node; 203 204 static struct vio_dev *root_vdev; 205 static u64 cdev_cfg_handle; 206 207 static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node) 208 { 209 const u64 *cfg_handle = NULL; 210 u64 a; 211 212 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 213 u64 target; 214 215 target = mdesc_arc_target(hp, a); 216 cfg_handle = mdesc_get_property(hp, target, 217 "cfg-handle", NULL); 218 if (cfg_handle) 219 break; 220 } 221 222 return cfg_handle; 223 } 224 225 /** 226 * vio_vdev_node() - Find VDEV node in MD 227 * @hp: Handle to the MD 228 * @vdev: Pointer to VDEV 229 * 230 * Find the node in the current MD which matches the given vio_dev. This 231 * must be done dynamically since the node value can change if the MD 232 * is updated. 233 * 234 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine 235 * 236 * Return: The VDEV node in MDESC 237 */ 238 u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev) 239 { 240 u64 node; 241 242 if (vdev == NULL) 243 return MDESC_NODE_NULL; 244 245 node = mdesc_get_node(hp, (const char *)vdev->node_name, 246 &vdev->md_node_info); 247 248 return node; 249 } 250 EXPORT_SYMBOL(vio_vdev_node); 251 252 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, 253 struct vio_dev *vdev) 254 { 255 u64 a; 256 257 vdev->tx_ino = ~0UL; 258 vdev->rx_ino = ~0UL; 259 vdev->channel_id = ~0UL; 260 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 261 const u64 *chan_id; 262 const u64 *irq; 263 u64 target; 264 265 target = mdesc_arc_target(hp, a); 266 267 irq = mdesc_get_property(hp, target, "tx-ino", NULL); 268 if (irq) 269 vdev->tx_ino = *irq; 270 271 irq = mdesc_get_property(hp, target, "rx-ino", NULL); 272 if (irq) 273 vdev->rx_ino = *irq; 274 275 chan_id = mdesc_get_property(hp, target, "id", NULL); 276 if (chan_id) 277 vdev->channel_id = *chan_id; 278 } 279 280 vdev->cdev_handle = cdev_cfg_handle; 281 } 282 283 int vio_set_intr(unsigned long dev_ino, int state) 284 { 285 int err; 286 287 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state); 288 return err; 289 } 290 EXPORT_SYMBOL(vio_set_intr); 291 292 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 293 const char *node_name, 294 struct device *parent) 295 { 296 const char *type, *compat; 297 struct device_node *dp; 298 struct vio_dev *vdev; 299 int err, tlen, clen; 300 const u64 *id, *cfg_handle; 301 302 type = mdesc_get_property(hp, mp, "device-type", &tlen); 303 if (!type) { 304 type = mdesc_get_property(hp, mp, "name", &tlen); 305 if (!type) { 306 type = mdesc_node_name(hp, mp); 307 tlen = strlen(type) + 1; 308 } 309 } 310 if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) { 311 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 312 type); 313 return NULL; 314 } 315 316 id = mdesc_get_property(hp, mp, "id", NULL); 317 318 cfg_handle = vio_cfg_handle(hp, mp); 319 320 compat = mdesc_get_property(hp, mp, "device-type", &clen); 321 if (!compat) { 322 clen = 0; 323 } else if (clen > VIO_MAX_COMPAT_LEN) { 324 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 325 clen, type); 326 return NULL; 327 } 328 329 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 330 if (!vdev) { 331 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 332 return NULL; 333 } 334 335 vdev->mp = mp; 336 memcpy(vdev->type, type, tlen); 337 if (compat) 338 memcpy(vdev->compat, compat, clen); 339 else 340 memset(vdev->compat, 0, sizeof(vdev->compat)); 341 vdev->compat_len = clen; 342 343 vdev->port_id = ~0UL; 344 vdev->tx_irq = 0; 345 vdev->rx_irq = 0; 346 347 vio_fill_channel_info(hp, mp, vdev); 348 349 if (!id) { 350 dev_set_name(&vdev->dev, "%s", type); 351 vdev->dev_no = ~(u64)0; 352 } else if (!cfg_handle) { 353 dev_set_name(&vdev->dev, "%s-%llu", type, *id); 354 vdev->dev_no = *id; 355 } else { 356 dev_set_name(&vdev->dev, "%s-%llu-%llu", type, 357 *cfg_handle, *id); 358 vdev->dev_no = *cfg_handle; 359 vdev->port_id = *id; 360 } 361 362 vdev->dev.parent = parent; 363 vdev->dev.bus = &vio_bus_type; 364 vdev->dev.release = vio_dev_release; 365 366 if (parent == NULL) { 367 dp = cdev_node; 368 } else if (to_vio_dev(parent) == root_vdev) { 369 dp = of_get_next_child(cdev_node, NULL); 370 while (dp) { 371 if (!strcmp(dp->type, type)) 372 break; 373 374 dp = of_get_next_child(cdev_node, dp); 375 } 376 } else { 377 dp = to_vio_dev(parent)->dp; 378 } 379 vdev->dp = dp; 380 381 /* 382 * node_name is NULL for the parent/channel-devices node and 383 * the parent doesn't require the MD node info. 384 */ 385 if (node_name != NULL) { 386 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s", 387 node_name); 388 389 err = mdesc_get_node_info(hp, mp, node_name, 390 &vdev->md_node_info); 391 if (err) { 392 pr_err("VIO: Could not get MD node info %s, err=%d\n", 393 dev_name(&vdev->dev), err); 394 kfree(vdev); 395 return NULL; 396 } 397 } 398 399 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n", 400 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino); 401 402 err = device_register(&vdev->dev); 403 if (err) { 404 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 405 dev_name(&vdev->dev), err); 406 kfree(vdev); 407 return NULL; 408 } 409 if (vdev->dp) 410 err = sysfs_create_file(&vdev->dev.kobj, 411 &dev_attr_obppath.attr); 412 413 return vdev; 414 } 415 416 static void vio_add(struct mdesc_handle *hp, u64 node, 417 const char *node_name) 418 { 419 (void) vio_create_one(hp, node, node_name, &root_vdev->dev); 420 } 421 422 struct vio_remove_node_data { 423 struct mdesc_handle *hp; 424 u64 node; 425 }; 426 427 static int vio_md_node_match(struct device *dev, void *arg) 428 { 429 struct vio_dev *vdev = to_vio_dev(dev); 430 struct vio_remove_node_data *node_data; 431 u64 node; 432 433 node_data = (struct vio_remove_node_data *)arg; 434 435 node = vio_vdev_node(node_data->hp, vdev); 436 437 if (node == node_data->node) 438 return 1; 439 else 440 return 0; 441 } 442 443 static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name) 444 { 445 struct vio_remove_node_data node_data; 446 struct device *dev; 447 448 node_data.hp = hp; 449 node_data.node = node; 450 451 dev = device_find_child(&root_vdev->dev, (void *)&node_data, 452 vio_md_node_match); 453 if (dev) { 454 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 455 456 device_unregister(dev); 457 put_device(dev); 458 } else { 459 pr_err("VIO: %s node not found in MDESC\n", node_name); 460 } 461 } 462 463 static struct mdesc_notifier_client vio_device_notifier = { 464 .add = vio_add, 465 .remove = vio_remove, 466 .node_name = "virtual-device-port", 467 }; 468 469 /* We are only interested in domain service ports under the 470 * "domain-services" node. On control nodes there is another port 471 * under "openboot" that we should not mess with as aparently that is 472 * reserved exclusively for OBP use. 473 */ 474 static void vio_add_ds(struct mdesc_handle *hp, u64 node, 475 const char *node_name) 476 { 477 int found; 478 u64 a; 479 480 found = 0; 481 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 482 u64 target = mdesc_arc_target(hp, a); 483 const char *name = mdesc_node_name(hp, target); 484 485 if (!strcmp(name, "domain-services")) { 486 found = 1; 487 break; 488 } 489 } 490 491 if (found) 492 (void) vio_create_one(hp, node, node_name, &root_vdev->dev); 493 } 494 495 static struct mdesc_notifier_client vio_ds_notifier = { 496 .add = vio_add_ds, 497 .remove = vio_remove, 498 .node_name = "domain-services-port", 499 }; 500 501 static const char *channel_devices_node = "channel-devices"; 502 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 503 static const char *cfg_handle_prop = "cfg-handle"; 504 505 static int __init vio_init(void) 506 { 507 struct mdesc_handle *hp; 508 const char *compat; 509 const u64 *cfg_handle; 510 int err, len; 511 u64 root; 512 513 err = bus_register(&vio_bus_type); 514 if (err) { 515 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 516 err); 517 return err; 518 } 519 520 hp = mdesc_grab(); 521 if (!hp) 522 return 0; 523 524 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 525 if (root == MDESC_NODE_NULL) { 526 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 527 mdesc_release(hp); 528 return 0; 529 } 530 531 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 532 err = -ENODEV; 533 if (!cdev_node) { 534 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 535 goto out_release; 536 } 537 538 compat = mdesc_get_property(hp, root, "compatible", &len); 539 if (!compat) { 540 printk(KERN_ERR "VIO: Channel devices lacks compatible " 541 "property\n"); 542 goto out_release; 543 } 544 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 545 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 546 "compat entry.\n", channel_devices_compat); 547 goto out_release; 548 } 549 550 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 551 if (!cfg_handle) { 552 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 553 cfg_handle_prop); 554 goto out_release; 555 } 556 557 cdev_cfg_handle = *cfg_handle; 558 559 root_vdev = vio_create_one(hp, root, NULL, NULL); 560 err = -ENODEV; 561 if (!root_vdev) { 562 printk(KERN_ERR "VIO: Could not create root device.\n"); 563 goto out_release; 564 } 565 566 mdesc_register_notifier(&vio_device_notifier); 567 mdesc_register_notifier(&vio_ds_notifier); 568 569 mdesc_release(hp); 570 571 return err; 572 573 out_release: 574 mdesc_release(hp); 575 return err; 576 } 577 578 postcore_initcall(vio_init); 579