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) 123 { 124 viodrv->driver.bus = &vio_bus_type; 125 126 return driver_register(&viodrv->driver); 127 } 128 EXPORT_SYMBOL(vio_register_driver); 129 130 void vio_unregister_driver(struct vio_driver *viodrv) 131 { 132 driver_unregister(&viodrv->driver); 133 } 134 EXPORT_SYMBOL(vio_unregister_driver); 135 136 static void vio_dev_release(struct device *dev) 137 { 138 kfree(to_vio_dev(dev)); 139 } 140 141 static ssize_t 142 show_pciobppath_attr(struct device *dev, struct device_attribute *attr, 143 char *buf) 144 { 145 struct vio_dev *vdev; 146 struct device_node *dp; 147 148 vdev = to_vio_dev(dev); 149 dp = vdev->dp; 150 151 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); 152 } 153 154 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, 155 show_pciobppath_attr, NULL); 156 157 static struct device_node *cdev_node; 158 159 static struct vio_dev *root_vdev; 160 static u64 cdev_cfg_handle; 161 162 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, 163 struct vio_dev *vdev) 164 { 165 u64 a; 166 167 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 168 const u64 *chan_id; 169 const u64 *irq; 170 u64 target; 171 172 target = mdesc_arc_target(hp, a); 173 174 irq = mdesc_get_property(hp, target, "tx-ino", NULL); 175 if (irq) 176 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 177 178 irq = mdesc_get_property(hp, target, "rx-ino", NULL); 179 if (irq) 180 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 181 182 chan_id = mdesc_get_property(hp, target, "id", NULL); 183 if (chan_id) 184 vdev->channel_id = *chan_id; 185 } 186 } 187 188 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 189 struct device *parent) 190 { 191 const char *type, *compat, *bus_id_name; 192 struct device_node *dp; 193 struct vio_dev *vdev; 194 int err, tlen, clen; 195 const u64 *id, *cfg_handle; 196 u64 a; 197 198 type = mdesc_get_property(hp, mp, "device-type", &tlen); 199 if (!type) { 200 type = mdesc_get_property(hp, mp, "name", &tlen); 201 if (!type) { 202 type = mdesc_node_name(hp, mp); 203 tlen = strlen(type) + 1; 204 } 205 } 206 if (tlen > VIO_MAX_TYPE_LEN) { 207 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 208 type); 209 return NULL; 210 } 211 212 id = mdesc_get_property(hp, mp, "id", NULL); 213 214 cfg_handle = NULL; 215 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 216 u64 target; 217 218 target = mdesc_arc_target(hp, a); 219 cfg_handle = mdesc_get_property(hp, target, 220 "cfg-handle", NULL); 221 if (cfg_handle) 222 break; 223 } 224 225 bus_id_name = type; 226 if (!strcmp(type, "domain-services-port")) 227 bus_id_name = "ds"; 228 229 /* 230 * 20 char is the old driver-core name size limit, which is no more. 231 * This check can probably be removed after review and possible 232 * adaption of the vio users name length handling. 233 */ 234 if (strlen(bus_id_name) >= 20 - 4) { 235 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", 236 bus_id_name); 237 return NULL; 238 } 239 240 compat = mdesc_get_property(hp, mp, "device-type", &clen); 241 if (!compat) { 242 clen = 0; 243 } else if (clen > VIO_MAX_COMPAT_LEN) { 244 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 245 clen, type); 246 return NULL; 247 } 248 249 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 250 if (!vdev) { 251 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 252 return NULL; 253 } 254 255 vdev->mp = mp; 256 memcpy(vdev->type, type, tlen); 257 if (compat) 258 memcpy(vdev->compat, compat, clen); 259 else 260 memset(vdev->compat, 0, sizeof(vdev->compat)); 261 vdev->compat_len = clen; 262 263 vdev->channel_id = ~0UL; 264 vdev->tx_irq = ~0; 265 vdev->rx_irq = ~0; 266 267 vio_fill_channel_info(hp, mp, vdev); 268 269 if (!id) { 270 dev_set_name(&vdev->dev, "%s", bus_id_name); 271 vdev->dev_no = ~(u64)0; 272 } else if (!cfg_handle) { 273 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); 274 vdev->dev_no = *id; 275 } else { 276 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, 277 *cfg_handle, *id); 278 vdev->dev_no = *cfg_handle; 279 } 280 281 vdev->dev.parent = parent; 282 vdev->dev.bus = &vio_bus_type; 283 vdev->dev.release = vio_dev_release; 284 285 if (parent == NULL) { 286 dp = cdev_node; 287 } else if (to_vio_dev(parent) == root_vdev) { 288 dp = of_get_next_child(cdev_node, NULL); 289 while (dp) { 290 if (!strcmp(dp->type, type)) 291 break; 292 293 dp = of_get_next_child(cdev_node, dp); 294 } 295 } else { 296 dp = to_vio_dev(parent)->dp; 297 } 298 vdev->dp = dp; 299 300 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); 301 302 err = device_register(&vdev->dev); 303 if (err) { 304 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 305 dev_name(&vdev->dev), err); 306 kfree(vdev); 307 return NULL; 308 } 309 if (vdev->dp) 310 err = sysfs_create_file(&vdev->dev.kobj, 311 &dev_attr_obppath.attr); 312 313 return vdev; 314 } 315 316 static void vio_add(struct mdesc_handle *hp, u64 node) 317 { 318 (void) vio_create_one(hp, node, &root_vdev->dev); 319 } 320 321 static int vio_md_node_match(struct device *dev, void *arg) 322 { 323 struct vio_dev *vdev = to_vio_dev(dev); 324 325 if (vdev->mp == (u64) arg) 326 return 1; 327 328 return 0; 329 } 330 331 static void vio_remove(struct mdesc_handle *hp, u64 node) 332 { 333 struct device *dev; 334 335 dev = device_find_child(&root_vdev->dev, (void *) node, 336 vio_md_node_match); 337 if (dev) { 338 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 339 340 device_unregister(dev); 341 } 342 } 343 344 static struct mdesc_notifier_client vio_device_notifier = { 345 .add = vio_add, 346 .remove = vio_remove, 347 .node_name = "virtual-device-port", 348 }; 349 350 /* We are only interested in domain service ports under the 351 * "domain-services" node. On control nodes there is another port 352 * under "openboot" that we should not mess with as aparently that is 353 * reserved exclusively for OBP use. 354 */ 355 static void vio_add_ds(struct mdesc_handle *hp, u64 node) 356 { 357 int found; 358 u64 a; 359 360 found = 0; 361 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 362 u64 target = mdesc_arc_target(hp, a); 363 const char *name = mdesc_node_name(hp, target); 364 365 if (!strcmp(name, "domain-services")) { 366 found = 1; 367 break; 368 } 369 } 370 371 if (found) 372 (void) vio_create_one(hp, node, &root_vdev->dev); 373 } 374 375 static struct mdesc_notifier_client vio_ds_notifier = { 376 .add = vio_add_ds, 377 .remove = vio_remove, 378 .node_name = "domain-services-port", 379 }; 380 381 static const char *channel_devices_node = "channel-devices"; 382 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 383 static const char *cfg_handle_prop = "cfg-handle"; 384 385 static int __init vio_init(void) 386 { 387 struct mdesc_handle *hp; 388 const char *compat; 389 const u64 *cfg_handle; 390 int err, len; 391 u64 root; 392 393 err = bus_register(&vio_bus_type); 394 if (err) { 395 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 396 err); 397 return err; 398 } 399 400 hp = mdesc_grab(); 401 if (!hp) 402 return 0; 403 404 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 405 if (root == MDESC_NODE_NULL) { 406 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 407 mdesc_release(hp); 408 return 0; 409 } 410 411 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 412 err = -ENODEV; 413 if (!cdev_node) { 414 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 415 goto out_release; 416 } 417 418 compat = mdesc_get_property(hp, root, "compatible", &len); 419 if (!compat) { 420 printk(KERN_ERR "VIO: Channel devices lacks compatible " 421 "property\n"); 422 goto out_release; 423 } 424 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 425 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 426 "compat entry.\n", channel_devices_compat); 427 goto out_release; 428 } 429 430 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 431 if (!cfg_handle) { 432 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 433 cfg_handle_prop); 434 goto out_release; 435 } 436 437 cdev_cfg_handle = *cfg_handle; 438 439 root_vdev = vio_create_one(hp, root, NULL); 440 err = -ENODEV; 441 if (!root_vdev) { 442 printk(KERN_ERR "VIO: Coult not create root device.\n"); 443 goto out_release; 444 } 445 446 mdesc_register_notifier(&vio_device_notifier); 447 mdesc_register_notifier(&vio_ds_notifier); 448 449 mdesc_release(hp); 450 451 return err; 452 453 out_release: 454 mdesc_release(hp); 455 return err; 456 } 457 458 postcore_initcall(vio_init); 459