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