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_fill_channel_info(struct mdesc_handle *hp, u64 mp,
 176                                   struct vio_dev *vdev)
 177 {
 178         u64 a;
 179
 180         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
 181                 const u64 *chan_id;
 182                 const u64 *irq;
 183                 u64 target;
 184
 185                 target = mdesc_arc_target(hp, a);
 186
 187                 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
 188                 if (irq)
 189                         vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 190
 191                 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
 192                 if (irq)
 193                         vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 194
 195                 chan_id = mdesc_get_property(hp, target, "id", NULL);
 196                 if (chan_id)
 197                         vdev->channel_id = *chan_id;
 198         }
 199 }
 200
 201 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
 202                                       struct device *parent)
 203 {
 204         const char *type, *compat, *bus_id_name;
 205         struct device_node *dp;
 206         struct vio_dev *vdev;
 207         int err, tlen, clen;
 208         const u64 *id;
 209
 210         type = mdesc_get_property(hp, mp, "device-type", &tlen);
 211         if (!type) {
 212                 type = mdesc_get_property(hp, mp, "name", &tlen);
 213                 if (!type) {
 214                         type = mdesc_node_name(hp, mp);
 215                         tlen = strlen(type) + 1;
 216                 }
 217         }
 218         if (tlen > VIO_MAX_TYPE_LEN) {
 219                 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
 220                        type);
 221                 return NULL;
 222         }
 223
 224         bus_id_name = type;
 225         if (!strcmp(type, "domain-services-port"))
 226                 bus_id_name = "ds";
 227
 228         if (strlen(bus_id_name) >= KOBJ_NAME_LEN - 4) {
 229                 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
 230                        bus_id_name);
 231                 return NULL;
 232         }
 233
 234         compat = mdesc_get_property(hp, mp, "device-type", &clen);
 235         if (!compat) {
 236                 clen = 0;
 237         } else if (clen > VIO_MAX_COMPAT_LEN) {
 238                 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
 239                        clen, type);
 240                 return NULL;
 241         }
 242
 243         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 244         if (!vdev) {
 245                 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
 246                 return NULL;
 247         }
 248
 249         vdev->mp = mp;
 250         memcpy(vdev->type, type, tlen);
 251         if (compat)
 252                 memcpy(vdev->compat, compat, clen);
 253         else
 254                 memset(vdev->compat, 0, sizeof(vdev->compat));
 255         vdev->compat_len = clen;
 256
 257         vdev->channel_id = ~0UL;
 258         vdev->tx_irq = ~0;
 259         vdev->rx_irq = ~0;
 260
 261         vio_fill_channel_info(hp, mp, vdev);
 262
 263         id = mdesc_get_property(hp, mp, "id", NULL);
 264         if (!id)
 265                 snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s",
 266                          bus_id_name);
 267         else
 268                 snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu",
 269                          bus_id_name, *id);
 270
 271         vdev->dev.parent = parent;
 272         vdev->dev.bus = &vio_bus_type;
 273         vdev->dev.release = vio_dev_release;
 274
 275         if (parent == NULL) {
 276                 dp = cdev_node;
 277         } else if (to_vio_dev(parent) == root_vdev) {
 278                 dp = of_get_next_child(cdev_node, NULL);
 279                 while (dp) {
 280                         if (!strcmp(dp->type, type))
 281                                 break;
 282
 283                         dp = of_get_next_child(cdev_node, dp);
 284                 }
 285         } else {
 286                 dp = to_vio_dev(parent)->dp;
 287         }
 288         vdev->dp = dp;
 289
 290         printk(KERN_ERR "VIO: Adding device %s\n", vdev->dev.bus_id);
 291
 292         err = device_register(&vdev->dev);
 293         if (err) {
 294                 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
 295                        vdev->dev.bus_id, err);
 296                 kfree(vdev);
 297                 return NULL;
 298         }
 299         if (vdev->dp)
 300                 err = sysfs_create_file(&vdev->dev.kobj,
 301                                         &dev_attr_obppath.attr);
 302
 303         return vdev;
 304 }
 305
 306 static void vio_add(struct mdesc_handle *hp, u64 node)
 307 {
 308         (void) vio_create_one(hp, node, &root_vdev->dev);
 309 }
 310
 311 static int vio_md_node_match(struct device *dev, void *arg)
 312 {
 313         struct vio_dev *vdev = to_vio_dev(dev);
 314
 315         if (vdev->mp == (u64) arg)
 316                 return 1;
 317
 318         return 0;
 319 }
 320
 321 static void vio_remove(struct mdesc_handle *hp, u64 node)
 322 {
 323         struct device *dev;
 324
 325         dev = device_find_child(&root_vdev->dev, (void *) node,
 326                                 vio_md_node_match);
 327         if (dev) {
 328                 printk(KERN_INFO "VIO: Removing device %s\n", dev->bus_id);
 329
 330                 device_unregister(dev);
 331         }
 332 }
 333
 334 static struct mdesc_notifier_client vio_device_notifier = {
 335         .add            = vio_add,
 336         .remove         = vio_remove,
 337         .node_name      = "virtual-device-port",
 338 };
 339
 340 static struct mdesc_notifier_client vio_ds_notifier = {
 341         .add            = vio_add,
 342         .remove         = vio_remove,
 343         .node_name      = "domain-services-port",
 344 };
 345
 346 const char *channel_devices_node = "channel-devices";
 347 const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
 348 const char *cfg_handle_prop = "cfg-handle";
 349
 350 static int __init vio_init(void)
 351 {
 352         struct mdesc_handle *hp;
 353         const char *compat;
 354         const u64 *cfg_handle;
 355         int err, len;
 356         u64 root;
 357
 358         err = bus_register(&vio_bus_type);
 359         if (err) {
 360                 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
 361                        err);
 362                 return err;
 363         }
 364
 365         hp = mdesc_grab();
 366         if (!hp)
 367                 return 0;
 368
 369         root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
 370         if (root == MDESC_NODE_NULL) {
 371                 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
 372                 mdesc_release(hp);
 373                 return 0;
 374         }
 375
 376         cdev_node = of_find_node_by_name(NULL, "channel-devices");
 377         err = -ENODEV;
 378         if (!cdev_node) {
 379                 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
 380                 goto out_release;
 381         }
 382
 383         compat = mdesc_get_property(hp, root, "compatible", &len);
 384         if (!compat) {
 385                 printk(KERN_ERR "VIO: Channel devices lacks compatible "
 386                        "property\n");
 387                 goto out_release;
 388         }
 389         if (!find_in_proplist(compat, channel_devices_compat, len)) {
 390                 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
 391                        "compat entry.\n", channel_devices_compat);
 392                 goto out_release;
 393         }
 394
 395         cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
 396         if (!cfg_handle) {
 397                 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
 398                        cfg_handle_prop);
 399                 goto out_release;
 400         }
 401
 402         cdev_cfg_handle = *cfg_handle;
 403
 404         root_vdev = vio_create_one(hp, root, NULL);
 405         err = -ENODEV;
 406         if (!root_vdev) {
 407                 printk(KERN_ERR "VIO: Coult not create root device.\n");
 408                 goto out_release;
 409         }
 410
 411         mdesc_register_notifier(&vio_device_notifier);
 412         mdesc_register_notifier(&vio_ds_notifier);
 413
 414         mdesc_release(hp);
 415
 416         return err;
 417
 418 out_release:
 419         mdesc_release(hp);
 420         return err;
 421 }
 422
 423 postcore_initcall(vio_init);