arch/sparc64/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 inline int find_in_proplist(const char *list, const char *match,
  20                                    int len)
  21 {
  22         while (len > 0) {
  23                 int l;
  24
  25                 if (!strcmp(list, match))
  26                         return 1;
  27                 l = strlen(list) + 1;
  28                 list += l;
  29                 len -= l;
  30         }
  31         return 0;
  32 }
  33
  34 static const struct vio_device_id *vio_match_device(
  35         const struct vio_device_id *matches,
  36         const struct vio_dev *dev)
  37 {
  38         const char *type, *compat;
  39         int len;
  40
  41         type = dev->type;
  42         compat = dev->compat;
  43         len = dev->compat_len;
  44
  45         while (matches->type[0] || matches->compat[0]) {
  46                 int match = 1;
  47                 if (matches->type[0])
  48                         match &= !strcmp(matches->type, type);
  49
  50                 if (matches->compat[0]) {
  51                         match &= len &&
  52                                 find_in_proplist(compat, matches->compat, len);
  53                 }
  54                 if (match)
  55                         return matches;
  56                 matches++;
  57         }
  58         return NULL;
  59 }
  60
  61 static int vio_bus_match(struct device *dev, struct device_driver *drv)
  62 {
  63         struct vio_dev *vio_dev = to_vio_dev(dev);
  64         struct vio_driver *vio_drv = to_vio_driver(drv);
  65         const struct vio_device_id *matches = vio_drv->id_table;
  66
  67         if (!matches)
  68                 return 0;
  69
  70         return vio_match_device(matches, vio_dev) != NULL;
  71 }
  72
  73 static int vio_device_probe(struct device *dev)
  74 {
  75         struct vio_dev *vdev = to_vio_dev(dev);
  76         struct vio_driver *drv = to_vio_driver(dev->driver);
  77         const struct vio_device_id *id;
  78         int error = -ENODEV;
  79
  80         if (drv->probe) {
  81                 id = vio_match_device(drv->id_table, vdev);
  82                 if (id)
  83                         error = drv->probe(vdev, id);
  84         }
  85
  86         return error;
  87 }
  88
  89 static int vio_device_remove(struct device *dev)
  90 {
  91         struct vio_dev *vdev = to_vio_dev(dev);
  92         struct vio_driver *drv = to_vio_driver(dev->driver);
  93
  94         if (drv->remove)
  95                 return drv->remove(vdev);
  96
  97         return 1;
  98 }
  99
 100 static ssize_t devspec_show(struct device *dev,
 101                 struct device_attribute *attr, char *buf)
 102 {
 103         struct vio_dev *vdev = to_vio_dev(dev);
 104         const char *str = "none";
 105
 106         if (!strcmp(vdev->type, "network"))
 107                 str = "vnet";
 108         else if (!strcmp(vdev->type, "block"))
 109                 str = "vdisk";
 110
 111         return sprintf(buf, "%s\n", str);
 112 }
 113
 114 static ssize_t type_show(struct device *dev,
 115                 struct device_attribute *attr, char *buf)
 116 {
 117         struct vio_dev *vdev = to_vio_dev(dev);
 118         return sprintf(buf, "%s\n", vdev->type);
 119 }
 120
 121 static struct device_attribute vio_dev_attrs[] = {
 122         __ATTR_RO(devspec),
 123         __ATTR_RO(type),
 124         __ATTR_NULL
 125 };
 126
 127 static struct bus_type vio_bus_type = {
 128         .name           = "vio",
 129         .dev_attrs      = vio_dev_attrs,
 130         .match          = vio_bus_match,
 131         .probe          = vio_device_probe,
 132         .remove         = vio_device_remove,
 133 };
 134
 135 int vio_register_driver(struct vio_driver *viodrv)
 136 {
 137         viodrv->driver.bus = &vio_bus_type;
 138
 139         return driver_register(&viodrv->driver);
 140 }
 141 EXPORT_SYMBOL(vio_register_driver);
 142
 143 void vio_unregister_driver(struct vio_driver *viodrv)
 144 {
 145         driver_unregister(&viodrv->driver);
 146 }
 147 EXPORT_SYMBOL(vio_unregister_driver);
 148
 149 static void __devinit vio_dev_release(struct device *dev)
 150 {
 151         kfree(to_vio_dev(dev));
 152 }
 153
 154 static ssize_t
 155 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
 156                      char *buf)
 157 {
 158         struct vio_dev *vdev;
 159         struct device_node *dp;
 160
 161         vdev = to_vio_dev(dev);
 162         dp = vdev->dp;
 163
 164         return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
 165 }
 166
 167 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
 168                    show_pciobppath_attr, NULL);
 169
 170 struct device_node *cdev_node;
 171
 172 static struct vio_dev *root_vdev;
 173 static u64 cdev_cfg_handle;
 174
 175 static void vio_add(struct mdesc_handle *hp, u64 node)
 176 {
 177         const char *name = mdesc_get_property(hp, node, "name", NULL);
 178         const u64 *id = mdesc_get_property(hp, node, "id", NULL);
 179
 180         printk(KERN_ERR "VIO: Device add (%s) ID[%lx]\n",
 181                name, *id);
 182 }
 183
 184 static void vio_remove(struct mdesc_handle *hp, u64 node)
 185 {
 186         const char *name = mdesc_get_property(hp, node, "name", NULL);
 187         const u64 *id = mdesc_get_property(hp, node, "id", NULL);
 188
 189         printk(KERN_ERR "VIO: Device remove (%s) ID[%lx]\n",
 190                name, *id);
 191 }
 192
 193 static struct mdesc_notifier_client vio_device_notifier = {
 194         .add            = vio_add,
 195         .remove         = vio_remove,
 196         .node_name      = "virtual-device-port",
 197 };
 198
 199 static struct mdesc_notifier_client vio_ds_notifier = {
 200         .add            = vio_add,
 201         .remove         = vio_remove,
 202         .node_name      = "domain-services-port",
 203 };
 204
 205 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
 206                                   struct vio_dev *vdev)
 207 {
 208         u64 a;
 209
 210         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
 211                 const u64 *chan_id;
 212                 const u64 *irq;
 213                 u64 target;
 214
 215                 target = mdesc_arc_target(hp, a);
 216
 217                 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
 218                 if (irq)
 219                         vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 220
 221                 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
 222                 if (irq)
 223                         vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 224
 225                 chan_id = mdesc_get_property(hp, target, "id", NULL);
 226                 if (chan_id)
 227                         vdev->channel_id = *chan_id;
 228         }
 229 }
 230
 231 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
 232                                       struct device *parent)
 233 {
 234         const char *type, *compat;
 235         struct device_node *dp;
 236         struct vio_dev *vdev;
 237         int err, tlen, clen;
 238
 239         type = mdesc_get_property(hp, mp, "device-type", &tlen);
 240         if (!type) {
 241                 type = mdesc_get_property(hp, mp, "name", &tlen);
 242                 if (!type) {
 243                         type = mdesc_node_name(hp, mp);
 244                         tlen = strlen(type) + 1;
 245                 }
 246         }
 247         if (tlen > VIO_MAX_TYPE_LEN) {
 248                 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
 249                        type);
 250                 return NULL;
 251         }
 252
 253         compat = mdesc_get_property(hp, mp, "device-type", &clen);
 254         if (!compat) {
 255                 clen = 0;
 256         } else if (clen > VIO_MAX_COMPAT_LEN) {
 257                 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
 258                        clen, type);
 259                 return NULL;
 260         }
 261
 262         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 263         if (!vdev) {
 264                 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
 265                 return NULL;
 266         }
 267
 268         vdev->mp = mp;
 269         memcpy(vdev->type, type, tlen);
 270         if (compat)
 271                 memcpy(vdev->compat, compat, clen);
 272         else
 273                 memset(vdev->compat, 0, sizeof(vdev->compat));
 274         vdev->compat_len = clen;
 275
 276         vdev->channel_id = ~0UL;
 277         vdev->tx_irq = ~0;
 278         vdev->rx_irq = ~0;
 279
 280         vio_fill_channel_info(hp, mp, vdev);
 281
 282         snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp);
 283         vdev->dev.parent = parent;
 284         vdev->dev.bus = &vio_bus_type;
 285         vdev->dev.release = vio_dev_release;
 286
 287         if (parent == NULL) {
 288                 dp = cdev_node;
 289         } else if (to_vio_dev(parent) == root_vdev) {
 290                 dp = of_get_next_child(cdev_node, NULL);
 291                 while (dp) {
 292                         if (!strcmp(dp->type, type))
 293                                 break;
 294
 295                         dp = of_get_next_child(cdev_node, dp);
 296                 }
 297         } else {
 298                 dp = to_vio_dev(parent)->dp;
 299         }
 300         vdev->dp = dp;
 301
 302         err = device_register(&vdev->dev);
 303         if (err) {
 304                 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
 305                        vdev->dev.bus_id, 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 walk_tree(struct mdesc_handle *hp, u64 n, struct vio_dev *parent)
 317 {
 318         u64 a;
 319
 320         mdesc_for_each_arc(a, hp, n, MDESC_ARC_TYPE_FWD) {
 321                 struct vio_dev *vdev;
 322                 u64 target;
 323
 324                 target = mdesc_arc_target(hp, a);
 325                 vdev = vio_create_one(hp, target, &parent->dev);
 326                 if (vdev)
 327                         walk_tree(hp, target, vdev);
 328         }
 329 }
 330
 331 static void create_devices(struct mdesc_handle *hp, u64 root)
 332 {
 333         u64 mp;
 334
 335         root_vdev = vio_create_one(hp, root, NULL);
 336         if (!root_vdev) {
 337                 printk(KERN_ERR "VIO: Coult not create root device.\n");
 338                 return;
 339         }
 340
 341         walk_tree(hp, root, root_vdev);
 342
 343         /* Domain services is odd as it doesn't sit underneath the
 344          * channel-devices node, so we plug it in manually.
 345          */
 346         mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "domain-services");
 347         if (mp != MDESC_NODE_NULL) {
 348                 struct vio_dev *parent = vio_create_one(hp, mp,
 349                                                         &root_vdev->dev);
 350
 351                 if (parent)
 352                         walk_tree(hp, mp, parent);
 353         }
 354 }
 355
 356 const char *channel_devices_node = "channel-devices";
 357 const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
 358 const char *cfg_handle_prop = "cfg-handle";
 359
 360 static int __init vio_init(void)
 361 {
 362         struct mdesc_handle *hp;
 363         const char *compat;
 364         const u64 *cfg_handle;
 365         int err, len;
 366         u64 root;
 367
 368         err = bus_register(&vio_bus_type);
 369         if (err) {
 370                 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
 371                        err);
 372                 return err;
 373         }
 374
 375         hp = mdesc_grab();
 376         if (!hp)
 377                 return 0;
 378
 379         root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
 380         if (root == MDESC_NODE_NULL) {
 381                 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
 382                 mdesc_release(hp);
 383                 return 0;
 384         }
 385
 386         cdev_node = of_find_node_by_name(NULL, "channel-devices");
 387         err = -ENODEV;
 388         if (!cdev_node) {
 389                 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
 390                 goto out_release;
 391         }
 392
 393         compat = mdesc_get_property(hp, root, "compatible", &len);
 394         if (!compat) {
 395                 printk(KERN_ERR "VIO: Channel devices lacks compatible "
 396                        "property\n");
 397                 goto out_release;
 398         }
 399         if (!find_in_proplist(compat, channel_devices_compat, len)) {
 400                 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
 401                        "compat entry.\n", channel_devices_compat);
 402                 goto out_release;
 403         }
 404
 405         cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
 406         if (!cfg_handle) {
 407                 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
 408                        cfg_handle_prop);
 409                 goto out_release;
 410         }
 411
 412         cdev_cfg_handle = *cfg_handle;
 413
 414         mdesc_register_notifier(&vio_device_notifier);
 415         mdesc_register_notifier(&vio_ds_notifier);
 416
 417         create_devices(hp, root);
 418
 419         mdesc_release(hp);
 420
 421         return 0;
 422
 423 out_release:
 424         mdesc_release(hp);
 425         return err;
 426 }
 427
 428 postcore_initcall(vio_init);