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