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/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);