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_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);