arch/sparc/kernel/vio.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* vio.c: Virtual I/O channel devices probing infrastructure.
   3  *
   4  *    Copyright (c) 2003-2005 IBM Corp.
   5  *     Dave Engebretsen engebret@us.ibm.com
   6  *     Santiago Leon santil@us.ibm.com
   7  *     Hollis Blanchard <hollisb@us.ibm.com>
   8  *     Stephen Rothwell
   9  *
  10  * Adapted to sparc64 by David S. Miller davem@davemloft.net
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/irq.h>
  16 #include <linux/export.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/mdesc.h>
  20 #include <asm/vio.h>
  21
  22 static const struct vio_device_id *vio_match_device(
  23         const struct vio_device_id *matches,
  24         const struct vio_dev *dev)
  25 {
  26         const char *type, *compat;
  27         int len;
  28
  29         type = dev->type;
  30         compat = dev->compat;
  31         len = dev->compat_len;
  32
  33         while (matches->type[0] || matches->compat[0]) {
  34                 int match = 1;
  35                 if (matches->type[0])
  36                         match &= !strcmp(matches->type, type);
  37
  38                 if (matches->compat[0]) {
  39                         match &= len &&
  40                                 of_find_in_proplist(compat, matches->compat, len);
  41                 }
  42                 if (match)
  43                         return matches;
  44                 matches++;
  45         }
  46         return NULL;
  47 }
  48
  49 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
  50 {
  51         const struct vio_dev *vio_dev = to_vio_dev(dev);
  52
  53         add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
  54         return 0;
  55 }
  56
  57 static int vio_bus_match(struct device *dev, struct device_driver *drv)
  58 {
  59         struct vio_dev *vio_dev = to_vio_dev(dev);
  60         struct vio_driver *vio_drv = to_vio_driver(drv);
  61         const struct vio_device_id *matches = vio_drv->id_table;
  62
  63         if (!matches)
  64                 return 0;
  65
  66         return vio_match_device(matches, vio_dev) != NULL;
  67 }
  68
  69 static int vio_device_probe(struct device *dev)
  70 {
  71         struct vio_dev *vdev = to_vio_dev(dev);
  72         struct vio_driver *drv = to_vio_driver(dev->driver);
  73         const struct vio_device_id *id;
  74
  75         if (!drv->probe)
  76                 return -ENODEV;
  77
  78         id = vio_match_device(drv->id_table, vdev);
  79         if (!id)
  80                 return -ENODEV;
  81
  82         /* alloc irqs (unless the driver specified not to) */
  83         if (!drv->no_irq) {
  84                 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
  85                         vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
  86                                                         vdev->tx_ino);
  87
  88                 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
  89                         vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
  90                                                         vdev->rx_ino);
  91         }
  92
  93         return drv->probe(vdev, id);
  94 }
  95
  96 static int vio_device_remove(struct device *dev)
  97 {
  98         struct vio_dev *vdev = to_vio_dev(dev);
  99         struct vio_driver *drv = to_vio_driver(dev->driver);
 100
 101         if (drv->remove) {
 102                 /*
 103                  * Ideally, we would remove/deallocate tx/rx virqs
 104                  * here - however, there are currently no support
 105                  * routines to do so at the moment. TBD
 106                  */
 107
 108                 return drv->remove(vdev);
 109         }
 110
 111         return 1;
 112 }
 113
 114 static ssize_t devspec_show(struct device *dev,
 115                 struct device_attribute *attr, char *buf)
 116 {
 117         struct vio_dev *vdev = to_vio_dev(dev);
 118         const char *str = "none";
 119
 120         if (!strcmp(vdev->type, "vnet-port"))
 121                 str = "vnet";
 122         else if (!strcmp(vdev->type, "vdc-port"))
 123                 str = "vdisk";
 124
 125         return sprintf(buf, "%s\n", str);
 126 }
 127 static DEVICE_ATTR_RO(devspec);
 128
 129 static ssize_t type_show(struct device *dev,
 130                 struct device_attribute *attr, char *buf)
 131 {
 132         struct vio_dev *vdev = to_vio_dev(dev);
 133         return sprintf(buf, "%s\n", vdev->type);
 134 }
 135 static DEVICE_ATTR_RO(type);
 136
 137 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 138                              char *buf)
 139 {
 140         const struct vio_dev *vdev = to_vio_dev(dev);
 141
 142         return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
 143 }
 144 static DEVICE_ATTR_RO(modalias);
 145
 146 static struct attribute *vio_dev_attrs[] = {
 147         &dev_attr_devspec.attr,
 148         &dev_attr_type.attr,
 149         &dev_attr_modalias.attr,
 150         NULL,
 151  };
 152 ATTRIBUTE_GROUPS(vio_dev);
 153
 154 static struct bus_type vio_bus_type = {
 155         .name           = "vio",
 156         .dev_groups     = vio_dev_groups,
 157         .uevent         = vio_hotplug,
 158         .match          = vio_bus_match,
 159         .probe          = vio_device_probe,
 160         .remove         = vio_device_remove,
 161 };
 162
 163 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
 164                         const char *mod_name)
 165 {
 166         viodrv->driver.bus = &vio_bus_type;
 167         viodrv->driver.name = viodrv->name;
 168         viodrv->driver.owner = owner;
 169         viodrv->driver.mod_name = mod_name;
 170
 171         return driver_register(&viodrv->driver);
 172 }
 173 EXPORT_SYMBOL(__vio_register_driver);
 174
 175 void vio_unregister_driver(struct vio_driver *viodrv)
 176 {
 177         driver_unregister(&viodrv->driver);
 178 }
 179 EXPORT_SYMBOL(vio_unregister_driver);
 180
 181 static void vio_dev_release(struct device *dev)
 182 {
 183         kfree(to_vio_dev(dev));
 184 }
 185
 186 static ssize_t
 187 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
 188                      char *buf)
 189 {
 190         struct vio_dev *vdev;
 191         struct device_node *dp;
 192
 193         vdev = to_vio_dev(dev);
 194         dp = vdev->dp;
 195
 196         return snprintf (buf, PAGE_SIZE, "%pOF\n", dp);
 197 }
 198
 199 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
 200                    show_pciobppath_attr, NULL);
 201
 202 static struct device_node *cdev_node;
 203
 204 static struct vio_dev *root_vdev;
 205 static u64 cdev_cfg_handle;
 206
 207 static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
 208 {
 209         const u64 *cfg_handle = NULL;
 210         u64 a;
 211
 212         mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
 213                 u64 target;
 214
 215                 target = mdesc_arc_target(hp, a);
 216                 cfg_handle = mdesc_get_property(hp, target,
 217                                                 "cfg-handle", NULL);
 218                 if (cfg_handle)
 219                         break;
 220         }
 221
 222         return cfg_handle;
 223 }
 224
 225 /**
 226  * vio_vdev_node() - Find VDEV node in MD
 227  * @hp:  Handle to the MD
 228  * @vdev:  Pointer to VDEV
 229  *
 230  * Find the node in the current MD which matches the given vio_dev. This
 231  * must be done dynamically since the node value can change if the MD
 232  * is updated.
 233  *
 234  * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
 235  *
 236  * Return: The VDEV node in MDESC
 237  */
 238 u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
 239 {
 240         u64 node;
 241
 242         if (vdev == NULL)
 243                 return MDESC_NODE_NULL;
 244
 245         node = mdesc_get_node(hp, (const char *)vdev->node_name,
 246                               &vdev->md_node_info);
 247
 248         return node;
 249 }
 250 EXPORT_SYMBOL(vio_vdev_node);
 251
 252 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
 253                                   struct vio_dev *vdev)
 254 {
 255         u64 a;
 256
 257         vdev->tx_ino = ~0UL;
 258         vdev->rx_ino = ~0UL;
 259         vdev->channel_id = ~0UL;
 260         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
 261                 const u64 *chan_id;
 262                 const u64 *irq;
 263                 u64 target;
 264
 265                 target = mdesc_arc_target(hp, a);
 266
 267                 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
 268                 if (irq)
 269                         vdev->tx_ino = *irq;
 270
 271                 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
 272                 if (irq)
 273                         vdev->rx_ino = *irq;
 274
 275                 chan_id = mdesc_get_property(hp, target, "id", NULL);
 276                 if (chan_id)
 277                         vdev->channel_id = *chan_id;
 278         }
 279
 280         vdev->cdev_handle = cdev_cfg_handle;
 281 }
 282
 283 int vio_set_intr(unsigned long dev_ino, int state)
 284 {
 285         int err;
 286
 287         err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
 288         return err;
 289 }
 290 EXPORT_SYMBOL(vio_set_intr);
 291
 292 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
 293                                       const char *node_name,
 294                                       struct device *parent)
 295 {
 296         const char *type, *compat;
 297         struct device_node *dp;
 298         struct vio_dev *vdev;
 299         int err, tlen, clen;
 300         const u64 *id, *cfg_handle;
 301
 302         type = mdesc_get_property(hp, mp, "device-type", &tlen);
 303         if (!type) {
 304                 type = mdesc_get_property(hp, mp, "name", &tlen);
 305                 if (!type) {
 306                         type = mdesc_node_name(hp, mp);
 307                         tlen = strlen(type) + 1;
 308                 }
 309         }
 310         if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
 311                 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
 312                        type);
 313                 return NULL;
 314         }
 315
 316         id = mdesc_get_property(hp, mp, "id", NULL);
 317
 318         cfg_handle = vio_cfg_handle(hp, mp);
 319
 320         compat = mdesc_get_property(hp, mp, "device-type", &clen);
 321         if (!compat) {
 322                 clen = 0;
 323         } else if (clen > VIO_MAX_COMPAT_LEN) {
 324                 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
 325                        clen, type);
 326                 return NULL;
 327         }
 328
 329         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 330         if (!vdev) {
 331                 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
 332                 return NULL;
 333         }
 334
 335         vdev->mp = mp;
 336         memcpy(vdev->type, type, tlen);
 337         if (compat)
 338                 memcpy(vdev->compat, compat, clen);
 339         else
 340                 memset(vdev->compat, 0, sizeof(vdev->compat));
 341         vdev->compat_len = clen;
 342
 343         vdev->port_id = ~0UL;
 344         vdev->tx_irq = 0;
 345         vdev->rx_irq = 0;
 346
 347         vio_fill_channel_info(hp, mp, vdev);
 348
 349         if (!id) {
 350                 dev_set_name(&vdev->dev, "%s", type);
 351                 vdev->dev_no = ~(u64)0;
 352         } else if (!cfg_handle) {
 353                 dev_set_name(&vdev->dev, "%s-%llu", type, *id);
 354                 vdev->dev_no = *id;
 355         } else {
 356                 dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
 357                              *cfg_handle, *id);
 358                 vdev->dev_no = *cfg_handle;
 359                 vdev->port_id = *id;
 360         }
 361
 362         vdev->dev.parent = parent;
 363         vdev->dev.bus = &vio_bus_type;
 364         vdev->dev.release = vio_dev_release;
 365
 366         if (parent == NULL) {
 367                 dp = cdev_node;
 368         } else if (to_vio_dev(parent) == root_vdev) {
 369                 for_each_child_of_node(cdev_node, dp) {
 370                         if (of_node_is_type(dp, type))
 371                                 break;
 372                 }
 373         } else {
 374                 dp = to_vio_dev(parent)->dp;
 375         }
 376         vdev->dp = dp;
 377
 378         /*
 379          * node_name is NULL for the parent/channel-devices node and
 380          * the parent doesn't require the MD node info.
 381          */
 382         if (node_name != NULL) {
 383                 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
 384                                 node_name);
 385
 386                 err = mdesc_get_node_info(hp, mp, node_name,
 387                                           &vdev->md_node_info);
 388                 if (err) {
 389                         pr_err("VIO: Could not get MD node info %s, err=%d\n",
 390                                dev_name(&vdev->dev), err);
 391                         kfree(vdev);
 392                         return NULL;
 393                 }
 394         }
 395
 396         pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
 397                 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
 398
 399         err = device_register(&vdev->dev);
 400         if (err) {
 401                 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
 402                        dev_name(&vdev->dev), err);
 403                 put_device(&vdev->dev);
 404                 return NULL;
 405         }
 406         if (vdev->dp)
 407                 err = sysfs_create_file(&vdev->dev.kobj,
 408                                         &dev_attr_obppath.attr);
 409
 410         return vdev;
 411 }
 412
 413 static void vio_add(struct mdesc_handle *hp, u64 node,
 414                     const char *node_name)
 415 {
 416         (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
 417 }
 418
 419 struct vio_remove_node_data {
 420         struct mdesc_handle *hp;
 421         u64 node;
 422 };
 423
 424 static int vio_md_node_match(struct device *dev, void *arg)
 425 {
 426         struct vio_dev *vdev = to_vio_dev(dev);
 427         struct vio_remove_node_data *node_data;
 428         u64 node;
 429
 430         node_data = (struct vio_remove_node_data *)arg;
 431
 432         node = vio_vdev_node(node_data->hp, vdev);
 433
 434         if (node == node_data->node)
 435                 return 1;
 436         else
 437                 return 0;
 438 }
 439
 440 static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
 441 {
 442         struct vio_remove_node_data node_data;
 443         struct device *dev;
 444
 445         node_data.hp = hp;
 446         node_data.node = node;
 447
 448         dev = device_find_child(&root_vdev->dev, (void *)&node_data,
 449                                 vio_md_node_match);
 450         if (dev) {
 451                 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
 452
 453                 device_unregister(dev);
 454                 put_device(dev);
 455         } else {
 456                 pr_err("VIO: %s node not found in MDESC\n", node_name);
 457         }
 458 }
 459
 460 static struct mdesc_notifier_client vio_device_notifier = {
 461         .add            = vio_add,
 462         .remove         = vio_remove,
 463         .node_name      = "virtual-device-port",
 464 };
 465
 466 /* We are only interested in domain service ports under the
 467  * "domain-services" node.  On control nodes there is another port
 468  * under "openboot" that we should not mess with as aparently that is
 469  * reserved exclusively for OBP use.
 470  */
 471 static void vio_add_ds(struct mdesc_handle *hp, u64 node,
 472                        const char *node_name)
 473 {
 474         int found;
 475         u64 a;
 476
 477         found = 0;
 478         mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
 479                 u64 target = mdesc_arc_target(hp, a);
 480                 const char *name = mdesc_node_name(hp, target);
 481
 482                 if (!strcmp(name, "domain-services")) {
 483                         found = 1;
 484                         break;
 485                 }
 486         }
 487
 488         if (found)
 489                 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
 490 }
 491
 492 static struct mdesc_notifier_client vio_ds_notifier = {
 493         .add            = vio_add_ds,
 494         .remove         = vio_remove,
 495         .node_name      = "domain-services-port",
 496 };
 497
 498 static const char *channel_devices_node = "channel-devices";
 499 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
 500 static const char *cfg_handle_prop = "cfg-handle";
 501
 502 static int __init vio_init(void)
 503 {
 504         struct mdesc_handle *hp;
 505         const char *compat;
 506         const u64 *cfg_handle;
 507         int err, len;
 508         u64 root;
 509
 510         err = bus_register(&vio_bus_type);
 511         if (err) {
 512                 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
 513                        err);
 514                 return err;
 515         }
 516
 517         hp = mdesc_grab();
 518         if (!hp)
 519                 return 0;
 520
 521         root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
 522         if (root == MDESC_NODE_NULL) {
 523                 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
 524                 mdesc_release(hp);
 525                 return 0;
 526         }
 527
 528         cdev_node = of_find_node_by_name(NULL, "channel-devices");
 529         err = -ENODEV;
 530         if (!cdev_node) {
 531                 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
 532                 goto out_release;
 533         }
 534
 535         compat = mdesc_get_property(hp, root, "compatible", &len);
 536         if (!compat) {
 537                 printk(KERN_ERR "VIO: Channel devices lacks compatible "
 538                        "property\n");
 539                 goto out_release;
 540         }
 541         if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
 542                 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
 543                        "compat entry.\n", channel_devices_compat);
 544                 goto out_release;
 545         }
 546
 547         cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
 548         if (!cfg_handle) {
 549                 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
 550                        cfg_handle_prop);
 551                 goto out_release;
 552         }
 553
 554         cdev_cfg_handle = *cfg_handle;
 555
 556         root_vdev = vio_create_one(hp, root, NULL, NULL);
 557         err = -ENODEV;
 558         if (!root_vdev) {
 559                 printk(KERN_ERR "VIO: Could not create root device.\n");
 560                 goto out_release;
 561         }
 562
 563         mdesc_register_notifier(&vio_device_notifier);
 564         mdesc_register_notifier(&vio_ds_notifier);
 565
 566         mdesc_release(hp);
 567
 568         return err;
 569
 570 out_release:
 571         mdesc_release(hp);
 572         return err;
 573 }
 574
 575 postcore_initcall(vio_init);