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); 185 186 chan_id = mdesc_get_property(hp, target, "id", NULL); 187 if (chan_id) 188 vdev->channel_id = *chan_id; 189 } 190 } 191 192 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 193 struct device *parent) 194 { 195 const char *type, *compat, *bus_id_name; 196 struct device_node *dp; 197 struct vio_dev *vdev; 198 int err, tlen, clen; 199 const u64 *id, *cfg_handle; 200 u64 a; 201 202 type = mdesc_get_property(hp, mp, "device-type", &tlen); 203 if (!type) { 204 type = mdesc_get_property(hp, mp, "name", &tlen); 205 if (!type) { 206 type = mdesc_node_name(hp, mp); 207 tlen = strlen(type) + 1; 208 } 209 } 210 if (tlen > VIO_MAX_TYPE_LEN) { 211 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 212 type); 213 return NULL; 214 } 215 216 id = mdesc_get_property(hp, mp, "id", NULL); 217 218 cfg_handle = NULL; 219 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 220 u64 target; 221 222 target = mdesc_arc_target(hp, a); 223 cfg_handle = mdesc_get_property(hp, target, 224 "cfg-handle", NULL); 225 if (cfg_handle) 226 break; 227 } 228 229 bus_id_name = type; 230 if (!strcmp(type, "domain-services-port")) 231 bus_id_name = "ds"; 232 233 /* 234 * 20 char is the old driver-core name size limit, which is no more. 235 * This check can probably be removed after review and possible 236 * adaption of the vio users name length handling. 237 */ 238 if (strlen(bus_id_name) >= 20 - 4) { 239 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", 240 bus_id_name); 241 return NULL; 242 } 243 244 compat = mdesc_get_property(hp, mp, "device-type", &clen); 245 if (!compat) { 246 clen = 0; 247 } else if (clen > VIO_MAX_COMPAT_LEN) { 248 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 249 clen, type); 250 return NULL; 251 } 252 253 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 254 if (!vdev) { 255 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 256 return NULL; 257 } 258 259 vdev->mp = mp; 260 memcpy(vdev->type, type, tlen); 261 if (compat) 262 memcpy(vdev->compat, compat, clen); 263 else 264 memset(vdev->compat, 0, sizeof(vdev->compat)); 265 vdev->compat_len = clen; 266 267 vdev->channel_id = ~0UL; 268 vdev->tx_irq = ~0; 269 vdev->rx_irq = ~0; 270 271 vio_fill_channel_info(hp, mp, vdev); 272 273 if (!id) { 274 dev_set_name(&vdev->dev, "%s", bus_id_name); 275 vdev->dev_no = ~(u64)0; 276 } else if (!cfg_handle) { 277 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); 278 vdev->dev_no = *id; 279 } else { 280 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, 281 *cfg_handle, *id); 282 vdev->dev_no = *cfg_handle; 283 } 284 285 vdev->dev.parent = parent; 286 vdev->dev.bus = &vio_bus_type; 287 vdev->dev.release = vio_dev_release; 288 289 if (parent == NULL) { 290 dp = cdev_node; 291 } else if (to_vio_dev(parent) == root_vdev) { 292 dp = of_get_next_child(cdev_node, NULL); 293 while (dp) { 294 if (!strcmp(dp->type, type)) 295 break; 296 297 dp = of_get_next_child(cdev_node, dp); 298 } 299 } else { 300 dp = to_vio_dev(parent)->dp; 301 } 302 vdev->dp = dp; 303 304 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); 305 306 err = device_register(&vdev->dev); 307 if (err) { 308 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 309 dev_name(&vdev->dev), err); 310 kfree(vdev); 311 return NULL; 312 } 313 if (vdev->dp) 314 err = sysfs_create_file(&vdev->dev.kobj, 315 &dev_attr_obppath.attr); 316 317 return vdev; 318 } 319 320 static void vio_add(struct mdesc_handle *hp, u64 node) 321 { 322 (void) vio_create_one(hp, node, &root_vdev->dev); 323 } 324 325 static int vio_md_node_match(struct device *dev, void *arg) 326 { 327 struct vio_dev *vdev = to_vio_dev(dev); 328 329 if (vdev->mp == (u64) arg) 330 return 1; 331 332 return 0; 333 } 334 335 static void vio_remove(struct mdesc_handle *hp, u64 node) 336 { 337 struct device *dev; 338 339 dev = device_find_child(&root_vdev->dev, (void *) node, 340 vio_md_node_match); 341 if (dev) { 342 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 343 344 device_unregister(dev); 345 put_device(dev); 346 } 347 } 348 349 static struct mdesc_notifier_client vio_device_notifier = { 350 .add = vio_add, 351 .remove = vio_remove, 352 .node_name = "virtual-device-port", 353 }; 354 355 /* We are only interested in domain service ports under the 356 * "domain-services" node. On control nodes there is another port 357 * under "openboot" that we should not mess with as aparently that is 358 * reserved exclusively for OBP use. 359 */ 360 static void vio_add_ds(struct mdesc_handle *hp, u64 node) 361 { 362 int found; 363 u64 a; 364 365 found = 0; 366 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 367 u64 target = mdesc_arc_target(hp, a); 368 const char *name = mdesc_node_name(hp, target); 369 370 if (!strcmp(name, "domain-services")) { 371 found = 1; 372 break; 373 } 374 } 375 376 if (found) 377 (void) vio_create_one(hp, node, &root_vdev->dev); 378 } 379 380 static struct mdesc_notifier_client vio_ds_notifier = { 381 .add = vio_add_ds, 382 .remove = vio_remove, 383 .node_name = "domain-services-port", 384 }; 385 386 static const char *channel_devices_node = "channel-devices"; 387 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 388 static const char *cfg_handle_prop = "cfg-handle"; 389 390 static int __init vio_init(void) 391 { 392 struct mdesc_handle *hp; 393 const char *compat; 394 const u64 *cfg_handle; 395 int err, len; 396 u64 root; 397 398 err = bus_register(&vio_bus_type); 399 if (err) { 400 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 401 err); 402 return err; 403 } 404 405 hp = mdesc_grab(); 406 if (!hp) 407 return 0; 408 409 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 410 if (root == MDESC_NODE_NULL) { 411 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 412 mdesc_release(hp); 413 return 0; 414 } 415 416 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 417 err = -ENODEV; 418 if (!cdev_node) { 419 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 420 goto out_release; 421 } 422 423 compat = mdesc_get_property(hp, root, "compatible", &len); 424 if (!compat) { 425 printk(KERN_ERR "VIO: Channel devices lacks compatible " 426 "property\n"); 427 goto out_release; 428 } 429 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 430 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 431 "compat entry.\n", channel_devices_compat); 432 goto out_release; 433 } 434 435 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 436 if (!cfg_handle) { 437 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 438 cfg_handle_prop); 439 goto out_release; 440 } 441 442 cdev_cfg_handle = *cfg_handle; 443 444 root_vdev = vio_create_one(hp, root, NULL); 445 err = -ENODEV; 446 if (!root_vdev) { 447 printk(KERN_ERR "VIO: Could not create root device.\n"); 448 goto out_release; 449 } 450 451 mdesc_register_notifier(&vio_device_notifier); 452 mdesc_register_notifier(&vio_ds_notifier); 453 454 mdesc_release(hp); 455 456 return err; 457 458 out_release: 459 mdesc_release(hp); 460 return err; 461 } 462 463 postcore_initcall(vio_init); 464