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