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