arch/sparc/kernel/vio.c

   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_hotplug(struct device *dev, struct kobj_uevent_env *env)
  49 {
  50         const struct vio_dev *vio_dev = to_vio_dev(dev);
  51
  52         add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
  53         return 0;
  54 }
  55
  56 static int vio_bus_match(struct device *dev, struct device_driver *drv)
  57 {
  58         struct vio_dev *vio_dev = to_vio_dev(dev);
  59         struct vio_driver *vio_drv = to_vio_driver(drv);
  60         const struct vio_device_id *matches = vio_drv->id_table;
  61
  62         if (!matches)
  63                 return 0;
  64
  65         return vio_match_device(matches, vio_dev) != NULL;
  66 }
  67
  68 static int vio_device_probe(struct device *dev)
  69 {
  70         struct vio_dev *vdev = to_vio_dev(dev);
  71         struct vio_driver *drv = to_vio_driver(dev->driver);
  72         const struct vio_device_id *id;
  73         int error = -ENODEV;
  74
  75         if (drv->probe) {
  76                 id = vio_match_device(drv->id_table, vdev);
  77                 if (id)
  78                         error = drv->probe(vdev, id);
  79         }
  80
  81         return error;
  82 }
  83
  84 static int vio_device_remove(struct device *dev)
  85 {
  86         struct vio_dev *vdev = to_vio_dev(dev);
  87         struct vio_driver *drv = to_vio_driver(dev->driver);
  88
  89         if (drv->remove)
  90                 return drv->remove(vdev);
  91
  92         return 1;
  93 }
  94
  95 static ssize_t devspec_show(struct device *dev,
  96                 struct device_attribute *attr, char *buf)
  97 {
  98         struct vio_dev *vdev = to_vio_dev(dev);
  99         const char *str = "none";
 100
 101         if (!strcmp(vdev->type, "vnet-port"))
 102                 str = "vnet";
 103         else if (!strcmp(vdev->type, "vdc-port"))
 104                 str = "vdisk";
 105
 106         return sprintf(buf, "%s\n", str);
 107 }
 108
 109 static ssize_t type_show(struct device *dev,
 110                 struct device_attribute *attr, char *buf)
 111 {
 112         struct vio_dev *vdev = to_vio_dev(dev);
 113         return sprintf(buf, "%s\n", vdev->type);
 114 }
 115
 116 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 117                              char *buf)
 118 {
 119         const struct vio_dev *vdev = to_vio_dev(dev);
 120
 121         return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
 122 }
 123
 124 static struct device_attribute vio_dev_attrs[] = {
 125         __ATTR_RO(devspec),
 126         __ATTR_RO(type),
 127         __ATTR_RO(modalias),
 128         __ATTR_NULL
 129 };
 130
 131 static struct bus_type vio_bus_type = {
 132         .name           = "vio",
 133         .dev_attrs      = vio_dev_attrs,
 134         .uevent         = vio_hotplug,
 135         .match          = vio_bus_match,
 136         .probe          = vio_device_probe,
 137         .remove         = vio_device_remove,
 138 };
 139
 140 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
 141                         const char *mod_name)
 142 {
 143         viodrv->driver.bus = &vio_bus_type;
 144         viodrv->driver.name = viodrv->name;
 145         viodrv->driver.owner = owner;
 146         viodrv->driver.mod_name = mod_name;
 147
 148         return driver_register(&viodrv->driver);
 149 }
 150 EXPORT_SYMBOL(__vio_register_driver);
 151
 152 void vio_unregister_driver(struct vio_driver *viodrv)
 153 {
 154         driver_unregister(&viodrv->driver);
 155 }
 156 EXPORT_SYMBOL(vio_unregister_driver);
 157
 158 static void vio_dev_release(struct device *dev)
 159 {
 160         kfree(to_vio_dev(dev));
 161 }
 162
 163 static ssize_t
 164 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
 165                      char *buf)
 166 {
 167         struct vio_dev *vdev;
 168         struct device_node *dp;
 169
 170         vdev = to_vio_dev(dev);
 171         dp = vdev->dp;
 172
 173         return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
 174 }
 175
 176 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
 177                    show_pciobppath_attr, NULL);
 178
 179 static struct device_node *cdev_node;
 180
 181 static struct vio_dev *root_vdev;
 182 static u64 cdev_cfg_handle;
 183
 184 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
 185                                   struct vio_dev *vdev)
 186 {
 187         u64 a;
 188
 189         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
 190                 const u64 *chan_id;
 191                 const u64 *irq;
 192                 u64 target;
 193
 194                 target = mdesc_arc_target(hp, a);
 195
 196                 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
 197                 if (irq)
 198                         vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 199
 200                 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
 201                 if (irq) {
 202                         vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 203                         vdev->rx_ino = *irq;
 204                 }
 205
 206                 chan_id = mdesc_get_property(hp, target, "id", NULL);
 207                 if (chan_id)
 208                         vdev->channel_id = *chan_id;
 209         }
 210 }
 211
 212 int vio_set_intr(unsigned long dev_ino, int state)
 213 {
 214         int err;
 215
 216         err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
 217         return err;
 218 }
 219 EXPORT_SYMBOL(vio_set_intr);
 220
 221 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
 222                                       struct device *parent)
 223 {
 224         const char *type, *compat, *bus_id_name;
 225         struct device_node *dp;
 226         struct vio_dev *vdev;
 227         int err, tlen, clen;
 228         const u64 *id, *cfg_handle;
 229         u64 a;
 230
 231         type = mdesc_get_property(hp, mp, "device-type", &tlen);
 232         if (!type) {
 233                 type = mdesc_get_property(hp, mp, "name", &tlen);
 234                 if (!type) {
 235                         type = mdesc_node_name(hp, mp);
 236                         tlen = strlen(type) + 1;
 237                 }
 238         }
 239         if (tlen > VIO_MAX_TYPE_LEN) {
 240                 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
 241                        type);
 242                 return NULL;
 243         }
 244
 245         id = mdesc_get_property(hp, mp, "id", NULL);
 246
 247         cfg_handle = NULL;
 248         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
 249                 u64 target;
 250
 251                 target = mdesc_arc_target(hp, a);
 252                 cfg_handle = mdesc_get_property(hp, target,
 253                                                 "cfg-handle", NULL);
 254                 if (cfg_handle)
 255                         break;
 256         }
 257
 258         bus_id_name = type;
 259         if (!strcmp(type, "domain-services-port"))
 260                 bus_id_name = "ds";
 261
 262         /*
 263          * 20 char is the old driver-core name size limit, which is no more.
 264          * This check can probably be removed after review and possible
 265          * adaption of the vio users name length handling.
 266          */
 267         if (strlen(bus_id_name) >= 20 - 4) {
 268                 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
 269                        bus_id_name);
 270                 return NULL;
 271         }
 272
 273         compat = mdesc_get_property(hp, mp, "device-type", &clen);
 274         if (!compat) {
 275                 clen = 0;
 276         } else if (clen > VIO_MAX_COMPAT_LEN) {
 277                 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
 278                        clen, type);
 279                 return NULL;
 280         }
 281
 282         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 283         if (!vdev) {
 284                 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
 285                 return NULL;
 286         }
 287
 288         vdev->mp = mp;
 289         memcpy(vdev->type, type, tlen);
 290         if (compat)
 291                 memcpy(vdev->compat, compat, clen);
 292         else
 293                 memset(vdev->compat, 0, sizeof(vdev->compat));
 294         vdev->compat_len = clen;
 295
 296         vdev->channel_id = ~0UL;
 297         vdev->tx_irq = ~0;
 298         vdev->rx_irq = ~0;
 299
 300         vio_fill_channel_info(hp, mp, vdev);
 301
 302         if (!id) {
 303                 dev_set_name(&vdev->dev, "%s", bus_id_name);
 304                 vdev->dev_no = ~(u64)0;
 305         } else if (!cfg_handle) {
 306                 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
 307                 vdev->dev_no = *id;
 308         } else {
 309                 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
 310                              *cfg_handle, *id);
 311                 vdev->dev_no = *cfg_handle;
 312         }
 313
 314         vdev->dev.parent = parent;
 315         vdev->dev.bus = &vio_bus_type;
 316         vdev->dev.release = vio_dev_release;
 317
 318         if (parent == NULL) {
 319                 dp = cdev_node;
 320         } else if (to_vio_dev(parent) == root_vdev) {
 321                 dp = of_get_next_child(cdev_node, NULL);
 322                 while (dp) {
 323                         if (!strcmp(dp->type, type))
 324                                 break;
 325
 326                         dp = of_get_next_child(cdev_node, dp);
 327                 }
 328         } else {
 329                 dp = to_vio_dev(parent)->dp;
 330         }
 331         vdev->dp = dp;
 332
 333         printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
 334
 335         err = device_register(&vdev->dev);
 336         if (err) {
 337                 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
 338                        dev_name(&vdev->dev), err);
 339                 kfree(vdev);
 340                 return NULL;
 341         }
 342         if (vdev->dp)
 343                 err = sysfs_create_file(&vdev->dev.kobj,
 344                                         &dev_attr_obppath.attr);
 345
 346         return vdev;
 347 }
 348
 349 static void vio_add(struct mdesc_handle *hp, u64 node)
 350 {
 351         (void) vio_create_one(hp, node, &root_vdev->dev);
 352 }
 353
 354 static int vio_md_node_match(struct device *dev, void *arg)
 355 {
 356         struct vio_dev *vdev = to_vio_dev(dev);
 357
 358         if (vdev->mp == (u64) arg)
 359                 return 1;
 360
 361         return 0;
 362 }
 363
 364 static void vio_remove(struct mdesc_handle *hp, u64 node)
 365 {
 366         struct device *dev;
 367
 368         dev = device_find_child(&root_vdev->dev, (void *) node,
 369                                 vio_md_node_match);
 370         if (dev) {
 371                 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
 372
 373                 device_unregister(dev);
 374                 put_device(dev);
 375         }
 376 }
 377
 378 static struct mdesc_notifier_client vio_device_notifier = {
 379         .add            = vio_add,
 380         .remove         = vio_remove,
 381         .node_name      = "virtual-device-port",
 382 };
 383
 384 /* We are only interested in domain service ports under the
 385  * "domain-services" node.  On control nodes there is another port
 386  * under "openboot" that we should not mess with as aparently that is
 387  * reserved exclusively for OBP use.
 388  */
 389 static void vio_add_ds(struct mdesc_handle *hp, u64 node)
 390 {
 391         int found;
 392         u64 a;
 393
 394         found = 0;
 395         mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
 396                 u64 target = mdesc_arc_target(hp, a);
 397                 const char *name = mdesc_node_name(hp, target);
 398
 399                 if (!strcmp(name, "domain-services")) {
 400                         found = 1;
 401                         break;
 402                 }
 403         }
 404
 405         if (found)
 406                 (void) vio_create_one(hp, node, &root_vdev->dev);
 407 }
 408
 409 static struct mdesc_notifier_client vio_ds_notifier = {
 410         .add            = vio_add_ds,
 411         .remove         = vio_remove,
 412         .node_name      = "domain-services-port",
 413 };
 414
 415 static const char *channel_devices_node = "channel-devices";
 416 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
 417 static const char *cfg_handle_prop = "cfg-handle";
 418
 419 static int __init vio_init(void)
 420 {
 421         struct mdesc_handle *hp;
 422         const char *compat;
 423         const u64 *cfg_handle;
 424         int err, len;
 425         u64 root;
 426
 427         err = bus_register(&vio_bus_type);
 428         if (err) {
 429                 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
 430                        err);
 431                 return err;
 432         }
 433
 434         hp = mdesc_grab();
 435         if (!hp)
 436                 return 0;
 437
 438         root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
 439         if (root == MDESC_NODE_NULL) {
 440                 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
 441                 mdesc_release(hp);
 442                 return 0;
 443         }
 444
 445         cdev_node = of_find_node_by_name(NULL, "channel-devices");
 446         err = -ENODEV;
 447         if (!cdev_node) {
 448                 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
 449                 goto out_release;
 450         }
 451
 452         compat = mdesc_get_property(hp, root, "compatible", &len);
 453         if (!compat) {
 454                 printk(KERN_ERR "VIO: Channel devices lacks compatible "
 455                        "property\n");
 456                 goto out_release;
 457         }
 458         if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
 459                 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
 460                        "compat entry.\n", channel_devices_compat);
 461                 goto out_release;
 462         }
 463
 464         cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
 465         if (!cfg_handle) {
 466                 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
 467                        cfg_handle_prop);
 468                 goto out_release;
 469         }
 470
 471         cdev_cfg_handle = *cfg_handle;
 472
 473         root_vdev = vio_create_one(hp, root, NULL);
 474         err = -ENODEV;
 475         if (!root_vdev) {
 476                 printk(KERN_ERR "VIO: Could not create root device.\n");
 477                 goto out_release;
 478         }
 479
 480         mdesc_register_notifier(&vio_device_notifier);
 481         mdesc_register_notifier(&vio_ds_notifier);
 482
 483         mdesc_release(hp);
 484
 485         return err;
 486
 487 out_release:
 488         mdesc_release(hp);
 489         return err;
 490 }
 491
 492 postcore_initcall(vio_init);