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/init.h> 16 17#include <asm/mdesc.h> 18#include <asm/vio.h> 19 20static const struct vio_device_id *vio_match_device( 21 const struct vio_device_id *matches, 22 const struct vio_dev *dev) 23{ 24 const char *type, *compat; 25 int len; 26 27 type = dev->type; 28 compat = dev->compat; 29 len = dev->compat_len; 30 31 while (matches->type[0] || matches->compat[0]) { 32 int match = 1; 33 if (matches->type[0]) 34 match &= !strcmp(matches->type, type); 35 36 if (matches->compat[0]) { 37 match &= len && 38 of_find_in_proplist(compat, matches->compat, len); 39 } 40 if (match) 41 return matches; 42 matches++; 43 } 44 return NULL; 45} 46 47static int vio_bus_match(struct device *dev, struct device_driver *drv) 48{ 49 struct vio_dev *vio_dev = to_vio_dev(dev); 50 struct vio_driver *vio_drv = to_vio_driver(drv); 51 const struct vio_device_id *matches = vio_drv->id_table; 52 53 if (!matches) 54 return 0; 55 56 return vio_match_device(matches, vio_dev) != NULL; 57} 58 59static int vio_device_probe(struct device *dev) 60{ 61 struct vio_dev *vdev = to_vio_dev(dev); 62 struct vio_driver *drv = to_vio_driver(dev->driver); 63 const struct vio_device_id *id; 64 int error = -ENODEV; 65 66 if (drv->probe) { 67 id = vio_match_device(drv->id_table, vdev); 68 if (id) 69 error = drv->probe(vdev, id); 70 } 71 72 return error; 73} 74 75static int vio_device_remove(struct device *dev) 76{ 77 struct vio_dev *vdev = to_vio_dev(dev); 78 struct vio_driver *drv = to_vio_driver(dev->driver); 79 80 if (drv->remove) 81 return drv->remove(vdev); 82 83 return 1; 84} 85 86static ssize_t devspec_show(struct device *dev, 87 struct device_attribute *attr, char *buf) 88{ 89 struct vio_dev *vdev = to_vio_dev(dev); 90 const char *str = "none"; 91 92 if (!strcmp(vdev->type, "vnet-port")) 93 str = "vnet"; 94 else if (!strcmp(vdev->type, "vdc-port")) 95 str = "vdisk"; 96 97 return sprintf(buf, "%s\n", str); 98} 99 100static ssize_t type_show(struct device *dev, 101 struct device_attribute *attr, char *buf) 102{ 103 struct vio_dev *vdev = to_vio_dev(dev); 104 return sprintf(buf, "%s\n", vdev->type); 105} 106 107static struct device_attribute vio_dev_attrs[] = { 108 __ATTR_RO(devspec), 109 __ATTR_RO(type), 110 __ATTR_NULL 111}; 112 113static struct bus_type vio_bus_type = { 114 .name = "vio", 115 .dev_attrs = vio_dev_attrs, 116 .match = vio_bus_match, 117 .probe = vio_device_probe, 118 .remove = vio_device_remove, 119}; 120 121int vio_register_driver(struct vio_driver *viodrv) 122{ 123 viodrv->driver.bus = &vio_bus_type; 124 125 return driver_register(&viodrv->driver); 126} 127EXPORT_SYMBOL(vio_register_driver); 128 129void vio_unregister_driver(struct vio_driver *viodrv) 130{ 131 driver_unregister(&viodrv->driver); 132} 133EXPORT_SYMBOL(vio_unregister_driver); 134 135static void vio_dev_release(struct device *dev) 136{ 137 kfree(to_vio_dev(dev)); 138} 139 140static ssize_t 141show_pciobppath_attr(struct device *dev, struct device_attribute *attr, 142 char *buf) 143{ 144 struct vio_dev *vdev; 145 struct device_node *dp; 146 147 vdev = to_vio_dev(dev); 148 dp = vdev->dp; 149 150 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); 151} 152 153static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, 154 show_pciobppath_attr, NULL); 155 156static struct device_node *cdev_node; 157 158static struct vio_dev *root_vdev; 159static u64 cdev_cfg_handle; 160 161static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, 162 struct vio_dev *vdev) 163{ 164 u64 a; 165 166 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 167 const u64 *chan_id; 168 const u64 *irq; 169 u64 target; 170 171 target = mdesc_arc_target(hp, a); 172 173 irq = mdesc_get_property(hp, target, "tx-ino", NULL); 174 if (irq) 175 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 176 177 irq = mdesc_get_property(hp, target, "rx-ino", NULL); 178 if (irq) 179 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); 180 181 chan_id = mdesc_get_property(hp, target, "id", NULL); 182 if (chan_id) 183 vdev->channel_id = *chan_id; 184 } 185} 186 187static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, 188 struct device *parent) 189{ 190 const char *type, *compat, *bus_id_name; 191 struct device_node *dp; 192 struct vio_dev *vdev; 193 int err, tlen, clen; 194 const u64 *id, *cfg_handle; 195 u64 a; 196 197 type = mdesc_get_property(hp, mp, "device-type", &tlen); 198 if (!type) { 199 type = mdesc_get_property(hp, mp, "name", &tlen); 200 if (!type) { 201 type = mdesc_node_name(hp, mp); 202 tlen = strlen(type) + 1; 203 } 204 } 205 if (tlen > VIO_MAX_TYPE_LEN) { 206 printk(KERN_ERR "VIO: Type string [%s] is too long.\n", 207 type); 208 return NULL; 209 } 210 211 id = mdesc_get_property(hp, mp, "id", NULL); 212 213 cfg_handle = NULL; 214 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 215 u64 target; 216 217 target = mdesc_arc_target(hp, a); 218 cfg_handle = mdesc_get_property(hp, target, 219 "cfg-handle", NULL); 220 if (cfg_handle) 221 break; 222 } 223 224 bus_id_name = type; 225 if (!strcmp(type, "domain-services-port")) 226 bus_id_name = "ds"; 227 228 /* 229 * 20 char is the old driver-core name size limit, which is no more. 230 * This check can probably be removed after review and possible 231 * adaption of the vio users name length handling. 232 */ 233 if (strlen(bus_id_name) >= 20 - 4) { 234 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", 235 bus_id_name); 236 return NULL; 237 } 238 239 compat = mdesc_get_property(hp, mp, "device-type", &clen); 240 if (!compat) { 241 clen = 0; 242 } else if (clen > VIO_MAX_COMPAT_LEN) { 243 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", 244 clen, type); 245 return NULL; 246 } 247 248 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 249 if (!vdev) { 250 printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); 251 return NULL; 252 } 253 254 vdev->mp = mp; 255 memcpy(vdev->type, type, tlen); 256 if (compat) 257 memcpy(vdev->compat, compat, clen); 258 else 259 memset(vdev->compat, 0, sizeof(vdev->compat)); 260 vdev->compat_len = clen; 261 262 vdev->channel_id = ~0UL; 263 vdev->tx_irq = ~0; 264 vdev->rx_irq = ~0; 265 266 vio_fill_channel_info(hp, mp, vdev); 267 268 if (!id) { 269 dev_set_name(&vdev->dev, "%s", bus_id_name); 270 vdev->dev_no = ~(u64)0; 271 } else if (!cfg_handle) { 272 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); 273 vdev->dev_no = *id; 274 } else { 275 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, 276 *cfg_handle, *id); 277 vdev->dev_no = *cfg_handle; 278 } 279 280 vdev->dev.parent = parent; 281 vdev->dev.bus = &vio_bus_type; 282 vdev->dev.release = vio_dev_release; 283 284 if (parent == NULL) { 285 dp = cdev_node; 286 } else if (to_vio_dev(parent) == root_vdev) { 287 dp = of_get_next_child(cdev_node, NULL); 288 while (dp) { 289 if (!strcmp(dp->type, type)) 290 break; 291 292 dp = of_get_next_child(cdev_node, dp); 293 } 294 } else { 295 dp = to_vio_dev(parent)->dp; 296 } 297 vdev->dp = dp; 298 299 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); 300 301 err = device_register(&vdev->dev); 302 if (err) { 303 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", 304 dev_name(&vdev->dev), err); 305 kfree(vdev); 306 return NULL; 307 } 308 if (vdev->dp) 309 err = sysfs_create_file(&vdev->dev.kobj, 310 &dev_attr_obppath.attr); 311 312 return vdev; 313} 314 315static void vio_add(struct mdesc_handle *hp, u64 node) 316{ 317 (void) vio_create_one(hp, node, &root_vdev->dev); 318} 319 320static int vio_md_node_match(struct device *dev, void *arg) 321{ 322 struct vio_dev *vdev = to_vio_dev(dev); 323 324 if (vdev->mp == (u64) arg) 325 return 1; 326 327 return 0; 328} 329 330static void vio_remove(struct mdesc_handle *hp, u64 node) 331{ 332 struct device *dev; 333 334 dev = device_find_child(&root_vdev->dev, (void *) node, 335 vio_md_node_match); 336 if (dev) { 337 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); 338 339 device_unregister(dev); 340 } 341} 342 343static struct mdesc_notifier_client vio_device_notifier = { 344 .add = vio_add, 345 .remove = vio_remove, 346 .node_name = "virtual-device-port", 347}; 348 349/* We are only interested in domain service ports under the 350 * "domain-services" node. On control nodes there is another port 351 * under "openboot" that we should not mess with as aparently that is 352 * reserved exclusively for OBP use. 353 */ 354static void vio_add_ds(struct mdesc_handle *hp, u64 node) 355{ 356 int found; 357 u64 a; 358 359 found = 0; 360 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 361 u64 target = mdesc_arc_target(hp, a); 362 const char *name = mdesc_node_name(hp, target); 363 364 if (!strcmp(name, "domain-services")) { 365 found = 1; 366 break; 367 } 368 } 369 370 if (found) 371 (void) vio_create_one(hp, node, &root_vdev->dev); 372} 373 374static struct mdesc_notifier_client vio_ds_notifier = { 375 .add = vio_add_ds, 376 .remove = vio_remove, 377 .node_name = "domain-services-port", 378}; 379 380static const char *channel_devices_node = "channel-devices"; 381static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; 382static const char *cfg_handle_prop = "cfg-handle"; 383 384static int __init vio_init(void) 385{ 386 struct mdesc_handle *hp; 387 const char *compat; 388 const u64 *cfg_handle; 389 int err, len; 390 u64 root; 391 392 err = bus_register(&vio_bus_type); 393 if (err) { 394 printk(KERN_ERR "VIO: Could not register bus type err=%d\n", 395 err); 396 return err; 397 } 398 399 hp = mdesc_grab(); 400 if (!hp) 401 return 0; 402 403 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); 404 if (root == MDESC_NODE_NULL) { 405 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); 406 mdesc_release(hp); 407 return 0; 408 } 409 410 cdev_node = of_find_node_by_name(NULL, "channel-devices"); 411 err = -ENODEV; 412 if (!cdev_node) { 413 printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); 414 goto out_release; 415 } 416 417 compat = mdesc_get_property(hp, root, "compatible", &len); 418 if (!compat) { 419 printk(KERN_ERR "VIO: Channel devices lacks compatible " 420 "property\n"); 421 goto out_release; 422 } 423 if (!of_find_in_proplist(compat, channel_devices_compat, len)) { 424 printk(KERN_ERR "VIO: Channel devices node lacks (%s) " 425 "compat entry.\n", channel_devices_compat); 426 goto out_release; 427 } 428 429 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); 430 if (!cfg_handle) { 431 printk(KERN_ERR "VIO: Channel devices lacks %s property\n", 432 cfg_handle_prop); 433 goto out_release; 434 } 435 436 cdev_cfg_handle = *cfg_handle; 437 438 root_vdev = vio_create_one(hp, root, NULL); 439 err = -ENODEV; 440 if (!root_vdev) { 441 printk(KERN_ERR "VIO: Coult not create root device.\n"); 442 goto out_release; 443 } 444 445 mdesc_register_notifier(&vio_device_notifier); 446 mdesc_register_notifier(&vio_ds_notifier); 447 448 mdesc_release(hp); 449 450 return err; 451 452out_release: 453 mdesc_release(hp); 454 return err; 455} 456 457postcore_initcall(vio_init); 458