arch/ppc64/kernel/vio.c

   1 /*
   2  * IBM PowerPC Virtual I/O Infrastructure Support.
   3  *
   4  *    Copyright (c) 2003 IBM Corp.
   5  *     Dave Engebretsen engebret@us.ibm.com
   6  *     Santiago Leon santil@us.ibm.com
   7  *     Hollis Blanchard <hollisb@us.ibm.com>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/console.h>
  17 #include <linux/version.h>
  18 #include <linux/module.h>
  19 #include <linux/kobject.h>
  20 #include <linux/mm.h>
  21 #include <linux/dma-mapping.h>
  22 #include <asm/rtas.h>
  23 #include <asm/iommu.h>
  24 #include <asm/dma.h>
  25 #include <asm/ppcdebug.h>
  26 #include <asm/vio.h>
  27 #include <asm/hvcall.h>
  28 #include <asm/iSeries/vio.h>
  29 #include <asm/iSeries/HvTypes.h>
  30 #include <asm/iSeries/HvCallXm.h>
  31 #include <asm/iSeries/HvLpConfig.h>
  32
  33 #define DBGENTER() pr_debug("%s entered\n", __FUNCTION__)
  34
  35 extern struct subsystem devices_subsys; /* needed for vio_find_name() */
  36
  37 static const struct vio_device_id *vio_match_device(
  38                 const struct vio_device_id *, const struct vio_dev *);
  39
  40 #ifdef CONFIG_PPC_PSERIES
  41 static struct iommu_table *vio_build_iommu_table(struct vio_dev *);
  42 static int vio_num_address_cells;
  43 #endif
  44 #ifdef CONFIG_PPC_ISERIES
  45 static struct iommu_table veth_iommu_table;
  46 static struct iommu_table vio_iommu_table;
  47 #endif
  48 static struct vio_dev vio_bus_device  = { /* fake "parent" device */
  49         .name = vio_bus_device.dev.bus_id,
  50         .type = "",
  51 #ifdef CONFIG_PPC_ISERIES
  52         .iommu_table = &vio_iommu_table,
  53 #endif
  54         .dev.bus_id = "vio",
  55         .dev.bus = &vio_bus_type,
  56 };
  57
  58 #ifdef CONFIG_PPC_ISERIES
  59 static struct vio_dev *__init vio_register_device_iseries(char *type,
  60                 uint32_t unit_num);
  61
  62 struct device *iSeries_vio_dev = &vio_bus_device.dev;
  63 EXPORT_SYMBOL(iSeries_vio_dev);
  64
  65 #define device_is_compatible(a, b)      1
  66
  67 #endif
  68
  69 /* convert from struct device to struct vio_dev and pass to driver.
  70  * dev->driver has already been set by generic code because vio_bus_match
  71  * succeeded. */
  72 static int vio_bus_probe(struct device *dev)
  73 {
  74         struct vio_dev *viodev = to_vio_dev(dev);
  75         struct vio_driver *viodrv = to_vio_driver(dev->driver);
  76         const struct vio_device_id *id;
  77         int error = -ENODEV;
  78
  79         DBGENTER();
  80
  81         if (!viodrv->probe)
  82                 return error;
  83
  84         id = vio_match_device(viodrv->id_table, viodev);
  85         if (id) {
  86                 error = viodrv->probe(viodev, id);
  87         }
  88
  89         return error;
  90 }
  91
  92 /* convert from struct device to struct vio_dev and pass to driver. */
  93 static int vio_bus_remove(struct device *dev)
  94 {
  95         struct vio_dev *viodev = to_vio_dev(dev);
  96         struct vio_driver *viodrv = to_vio_driver(dev->driver);
  97
  98         DBGENTER();
  99
 100         if (viodrv->remove) {
 101                 return viodrv->remove(viodev);
 102         }
 103
 104         /* driver can't remove */
 105         return 1;
 106 }
 107
 108 /**
 109  * vio_register_driver: - Register a new vio driver
 110  * @drv:        The vio_driver structure to be registered.
 111  */
 112 int vio_register_driver(struct vio_driver *viodrv)
 113 {
 114         printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
 115                 viodrv->name);
 116
 117         /* fill in 'struct driver' fields */
 118         viodrv->driver.name = viodrv->name;
 119         viodrv->driver.bus = &vio_bus_type;
 120         viodrv->driver.probe = vio_bus_probe;
 121         viodrv->driver.remove = vio_bus_remove;
 122
 123         return driver_register(&viodrv->driver);
 124 }
 125 EXPORT_SYMBOL(vio_register_driver);
 126
 127 /**
 128  * vio_unregister_driver - Remove registration of vio driver.
 129  * @driver:     The vio_driver struct to be removed form registration
 130  */
 131 void vio_unregister_driver(struct vio_driver *viodrv)
 132 {
 133         driver_unregister(&viodrv->driver);
 134 }
 135 EXPORT_SYMBOL(vio_unregister_driver);
 136
 137 /**
 138  * vio_match_device: - Tell if a VIO device has a matching VIO device id structure.
 139  * @ids:        array of VIO device id structures to search in
 140  * @dev:        the VIO device structure to match against
 141  *
 142  * Used by a driver to check whether a VIO device present in the
 143  * system is in its list of supported devices. Returns the matching
 144  * vio_device_id structure or NULL if there is no match.
 145  */
 146 static const struct vio_device_id * vio_match_device(const struct vio_device_id *ids,
 147         const struct vio_dev *dev)
 148 {
 149         DBGENTER();
 150
 151         while (ids->type) {
 152                 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
 153                         device_is_compatible(dev->dev.platform_data, ids->compat))
 154                         return ids;
 155                 ids++;
 156         }
 157         return NULL;
 158 }
 159
 160 #ifdef CONFIG_PPC_ISERIES
 161 void __init iommu_vio_init(void)
 162 {
 163         struct iommu_table *t;
 164         struct iommu_table_cb cb;
 165         unsigned long cbp;
 166         unsigned long itc_entries;
 167
 168         cb.itc_busno = 255;    /* Bus 255 is the virtual bus */
 169         cb.itc_virtbus = 0xff; /* Ask for virtual bus */
 170
 171         cbp = virt_to_abs(&cb);
 172         HvCallXm_getTceTableParms(cbp);
 173
 174         itc_entries = cb.itc_size * PAGE_SIZE / sizeof(union tce_entry);
 175         veth_iommu_table.it_size        = itc_entries / 2;
 176         veth_iommu_table.it_busno       = cb.itc_busno;
 177         veth_iommu_table.it_offset      = cb.itc_offset;
 178         veth_iommu_table.it_index       = cb.itc_index;
 179         veth_iommu_table.it_type        = TCE_VB;
 180         veth_iommu_table.it_blocksize   = 1;
 181
 182         t = iommu_init_table(&veth_iommu_table);
 183
 184         if (!t)
 185                 printk("Virtual Bus VETH TCE table failed.\n");
 186
 187         vio_iommu_table.it_size         = itc_entries - veth_iommu_table.it_size;
 188         vio_iommu_table.it_busno        = cb.itc_busno;
 189         vio_iommu_table.it_offset       = cb.itc_offset +
 190                                           veth_iommu_table.it_size;
 191         vio_iommu_table.it_index        = cb.itc_index;
 192         vio_iommu_table.it_type         = TCE_VB;
 193         vio_iommu_table.it_blocksize    = 1;
 194
 195         t = iommu_init_table(&vio_iommu_table);
 196
 197         if (!t)
 198                 printk("Virtual Bus VIO TCE table failed.\n");
 199 }
 200 #endif
 201
 202 #ifdef CONFIG_PPC_PSERIES
 203 static void probe_bus_pseries(void)
 204 {
 205         struct device_node *node_vroot, *of_node;
 206
 207         node_vroot = find_devices("vdevice");
 208         if ((node_vroot == NULL) || (node_vroot->child == NULL))
 209                 /* this machine doesn't do virtual IO, and that's ok */
 210                 return;
 211
 212         vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
 213
 214         /*
 215          * Create struct vio_devices for each virtual device in the device tree.
 216          * Drivers will associate with them later.
 217          */
 218         for (of_node = node_vroot->child; of_node != NULL;
 219                         of_node = of_node->sibling) {
 220                 printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
 221                 vio_register_device_node(of_node);
 222         }
 223 }
 224 #endif
 225
 226 #ifdef CONFIG_PPC_ISERIES
 227 static void probe_bus_iseries(void)
 228 {
 229         HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap();
 230         struct vio_dev *viodev;
 231         int i;
 232
 233         /* there is only one of each of these */
 234         vio_register_device_iseries("viocons", 0);
 235         vio_register_device_iseries("vscsi", 0);
 236
 237         vlan_map = HvLpConfig_getVirtualLanIndexMap();
 238         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
 239                 if ((vlan_map & (0x8000 >> i)) == 0)
 240                         continue;
 241                 viodev = vio_register_device_iseries("vlan", i);
 242                 /* veth is special and has it own iommu_table */
 243                 viodev->iommu_table = &veth_iommu_table;
 244         }
 245         for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
 246                 vio_register_device_iseries("viodasd", i);
 247         for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
 248                 vio_register_device_iseries("viocd", i);
 249         for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
 250                 vio_register_device_iseries("viotape", i);
 251 }
 252 #endif
 253
 254 /**
 255  * vio_bus_init: - Initialize the virtual IO bus
 256  */
 257 static int __init vio_bus_init(void)
 258 {
 259         int err;
 260
 261         err = bus_register(&vio_bus_type);
 262         if (err) {
 263                 printk(KERN_ERR "failed to register VIO bus\n");
 264                 return err;
 265         }
 266
 267         /* the fake parent of all vio devices, just to give us a nice directory */
 268         err = device_register(&vio_bus_device.dev);
 269         if (err) {
 270                 printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
 271                         err);
 272                 return err;
 273         }
 274
 275 #ifdef CONFIG_PPC_PSERIES
 276         probe_bus_pseries();
 277 #endif
 278 #ifdef CONFIG_PPC_ISERIES
 279         probe_bus_iseries();
 280 #endif
 281
 282         return 0;
 283 }
 284
 285 __initcall(vio_bus_init);
 286
 287 /* vio_dev refcount hit 0 */
 288 static void __devinit vio_dev_release(struct device *dev)
 289 {
 290         DBGENTER();
 291
 292 #ifdef CONFIG_PPC_PSERIES
 293         /* XXX free TCE table */
 294         of_node_put(dev->platform_data);
 295 #endif
 296         kfree(to_vio_dev(dev));
 297 }
 298
 299 #ifdef CONFIG_PPC_PSERIES
 300 static ssize_t viodev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 301 {
 302         struct device_node *of_node = dev->platform_data;
 303
 304         return sprintf(buf, "%s\n", of_node->full_name);
 305 }
 306 DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
 307 #endif
 308
 309 static ssize_t viodev_show_name(struct device *dev, struct device_attribute *attr, char *buf)
 310 {
 311         return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
 312 }
 313 DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
 314
 315 static struct vio_dev * __devinit vio_register_device_common(
 316                 struct vio_dev *viodev, char *name, char *type,
 317                 uint32_t unit_address, struct iommu_table *iommu_table)
 318 {
 319         DBGENTER();
 320
 321         viodev->name = name;
 322         viodev->type = type;
 323         viodev->unit_address = unit_address;
 324         viodev->iommu_table = iommu_table;
 325         /* init generic 'struct device' fields: */
 326         viodev->dev.parent = &vio_bus_device.dev;
 327         viodev->dev.bus = &vio_bus_type;
 328         viodev->dev.release = vio_dev_release;
 329
 330         /* register with generic device framework */
 331         if (device_register(&viodev->dev)) {
 332                 printk(KERN_ERR "%s: failed to register device %s\n",
 333                                 __FUNCTION__, viodev->dev.bus_id);
 334                 return NULL;
 335         }
 336         device_create_file(&viodev->dev, &dev_attr_name);
 337
 338         return viodev;
 339 }
 340
 341 #ifdef CONFIG_PPC_PSERIES
 342 /**
 343  * vio_register_device_node: - Register a new vio device.
 344  * @of_node:    The OF node for this device.
 345  *
 346  * Creates and initializes a vio_dev structure from the data in
 347  * of_node (dev.platform_data) and adds it to the list of virtual devices.
 348  * Returns a pointer to the created vio_dev or NULL if node has
 349  * NULL device_type or compatible fields.
 350  */
 351 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
 352 {
 353         struct vio_dev *viodev;
 354         unsigned int *unit_address;
 355         unsigned int *irq_p;
 356
 357         DBGENTER();
 358
 359         /* we need the 'device_type' property, in order to match with drivers */
 360         if ((NULL == of_node->type)) {
 361                 printk(KERN_WARNING
 362                         "%s: node %s missing 'device_type'\n", __FUNCTION__,
 363                         of_node->name ? of_node->name : "<unknown>");
 364                 return NULL;
 365         }
 366
 367         unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
 368         if (!unit_address) {
 369                 printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
 370                         of_node->name ? of_node->name : "<unknown>");
 371                 return NULL;
 372         }
 373
 374         /* allocate a vio_dev for this node */
 375         viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
 376         if (!viodev) {
 377                 return NULL;
 378         }
 379         memset(viodev, 0, sizeof(struct vio_dev));
 380
 381         viodev->dev.platform_data = of_node_get(of_node);
 382
 383         viodev->irq = NO_IRQ;
 384         irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
 385         if (irq_p) {
 386                 int virq = virt_irq_create_mapping(*irq_p);
 387                 if (virq == NO_IRQ) {
 388                         printk(KERN_ERR "Unable to allocate interrupt "
 389                                "number for %s\n", of_node->full_name);
 390                 } else
 391                         viodev->irq = irq_offset_up(virq);
 392         }
 393
 394         snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
 395
 396         /* register with generic device framework */
 397         if (vio_register_device_common(viodev, of_node->name, of_node->type,
 398                                 *unit_address, vio_build_iommu_table(viodev))
 399                         == NULL) {
 400                 /* XXX free TCE table */
 401                 kfree(viodev);
 402                 return NULL;
 403         }
 404         device_create_file(&viodev->dev, &dev_attr_devspec);
 405
 406         return viodev;
 407 }
 408 EXPORT_SYMBOL(vio_register_device_node);
 409 #endif
 410
 411 #ifdef CONFIG_PPC_ISERIES
 412 /**
 413  * vio_register_device: - Register a new vio device.
 414  * @voidev:     The device to register.
 415  */
 416 static struct vio_dev *__init vio_register_device_iseries(char *type,
 417                 uint32_t unit_num)
 418 {
 419         struct vio_dev *viodev;
 420
 421         DBGENTER();
 422
 423         /* allocate a vio_dev for this node */
 424         viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
 425         if (!viodev)
 426                 return NULL;
 427         memset(viodev, 0, sizeof(struct vio_dev));
 428
 429         snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num);
 430
 431         return vio_register_device_common(viodev, viodev->dev.bus_id, type,
 432                         unit_num, &vio_iommu_table);
 433 }
 434 #endif
 435
 436 void __devinit vio_unregister_device(struct vio_dev *viodev)
 437 {
 438         DBGENTER();
 439 #ifdef CONFIG_PPC_PSERIES
 440         device_remove_file(&viodev->dev, &dev_attr_devspec);
 441 #endif
 442         device_remove_file(&viodev->dev, &dev_attr_name);
 443         device_unregister(&viodev->dev);
 444 }
 445 EXPORT_SYMBOL(vio_unregister_device);
 446
 447 #ifdef CONFIG_PPC_PSERIES
 448 /**
 449  * vio_get_attribute: - get attribute for virtual device
 450  * @vdev:       The vio device to get property.
 451  * @which:      The property/attribute to be extracted.
 452  * @length:     Pointer to length of returned data size (unused if NULL).
 453  *
 454  * Calls prom.c's get_property() to return the value of the
 455  * attribute specified by the preprocessor constant @which
 456 */
 457 const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
 458 {
 459         return get_property(vdev->dev.platform_data, (char*)which, length);
 460 }
 461 EXPORT_SYMBOL(vio_get_attribute);
 462
 463 /* vio_find_name() - internal because only vio.c knows how we formatted the
 464  * kobject name
 465  * XXX once vio_bus_type.devices is actually used as a kset in
 466  * drivers/base/bus.c, this function should be removed in favor of
 467  * "device_find(kobj_name, &vio_bus_type)"
 468  */
 469 static struct vio_dev *vio_find_name(const char *kobj_name)
 470 {
 471         struct kobject *found;
 472
 473         found = kset_find_obj(&devices_subsys.kset, kobj_name);
 474         if (!found)
 475                 return NULL;
 476
 477         return to_vio_dev(container_of(found, struct device, kobj));
 478 }
 479
 480 /**
 481  * vio_find_node - find an already-registered vio_dev
 482  * @vnode: device_node of the virtual device we're looking for
 483  */
 484 struct vio_dev *vio_find_node(struct device_node *vnode)
 485 {
 486         uint32_t *unit_address;
 487         char kobj_name[BUS_ID_SIZE];
 488
 489         /* construct the kobject name from the device node */
 490         unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
 491         if (!unit_address)
 492                 return NULL;
 493         snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
 494
 495         return vio_find_name(kobj_name);
 496 }
 497 EXPORT_SYMBOL(vio_find_node);
 498
 499 /**
 500  * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree.
 501  * @dev: the virtual device.
 502  *
 503  * Returns a pointer to the built tce tree, or NULL if it can't
 504  * find property.
 505 */
 506 static struct iommu_table * vio_build_iommu_table(struct vio_dev *dev)
 507 {
 508         unsigned int *dma_window;
 509         struct iommu_table *newTceTable;
 510         unsigned long offset;
 511         int dma_window_property_size;
 512
 513         dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
 514         if(!dma_window) {
 515                 return NULL;
 516         }
 517
 518         newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
 519
 520         /*  There should be some code to extract the phys-encoded offset
 521                 using prom_n_addr_cells(). However, according to a comment
 522                 on earlier versions, it's always zero, so we don't bother */
 523         offset = dma_window[1] >>  PAGE_SHIFT;
 524
 525         /* TCE table size - measured in tce entries */
 526         newTceTable->it_size            = dma_window[4] >> PAGE_SHIFT;
 527         /* offset for VIO should always be 0 */
 528         newTceTable->it_offset          = offset;
 529         newTceTable->it_busno           = 0;
 530         newTceTable->it_index           = (unsigned long)dma_window[0];
 531         newTceTable->it_type            = TCE_VB;
 532
 533         return iommu_init_table(newTceTable);
 534 }
 535
 536 int vio_enable_interrupts(struct vio_dev *dev)
 537 {
 538         int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
 539         if (rc != H_Success) {
 540                 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
 541         }
 542         return rc;
 543 }
 544 EXPORT_SYMBOL(vio_enable_interrupts);
 545
 546 int vio_disable_interrupts(struct vio_dev *dev)
 547 {
 548         int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
 549         if (rc != H_Success) {
 550                 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
 551         }
 552         return rc;
 553 }
 554 EXPORT_SYMBOL(vio_disable_interrupts);
 555 #endif
 556
 557 static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
 558                           size_t size, enum dma_data_direction direction)
 559 {
 560         return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
 561                         direction);
 562 }
 563
 564 static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
 565                       size_t size, enum dma_data_direction direction)
 566 {
 567         iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
 568                         direction);
 569 }
 570
 571 static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
 572                 int nelems, enum dma_data_direction direction)
 573 {
 574         return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
 575                         nelems, direction);
 576 }
 577
 578 static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
 579                 int nelems, enum dma_data_direction direction)
 580 {
 581         iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
 582 }
 583
 584 static void *vio_alloc_coherent(struct device *dev, size_t size,
 585                            dma_addr_t *dma_handle, unsigned int __nocast flag)
 586 {
 587         return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
 588                         dma_handle, flag);
 589 }
 590
 591 static void vio_free_coherent(struct device *dev, size_t size,
 592                          void *vaddr, dma_addr_t dma_handle)
 593 {
 594         iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
 595                         dma_handle);
 596 }
 597
 598 static int vio_dma_supported(struct device *dev, u64 mask)
 599 {
 600         return 1;
 601 }
 602
 603 struct dma_mapping_ops vio_dma_ops = {
 604         .alloc_coherent = vio_alloc_coherent,
 605         .free_coherent = vio_free_coherent,
 606         .map_single = vio_map_single,
 607         .unmap_single = vio_unmap_single,
 608         .map_sg = vio_map_sg,
 609         .unmap_sg = vio_unmap_sg,
 610         .dma_supported = vio_dma_supported,
 611 };
 612
 613 static int vio_bus_match(struct device *dev, struct device_driver *drv)
 614 {
 615         const struct vio_dev *vio_dev = to_vio_dev(dev);
 616         struct vio_driver *vio_drv = to_vio_driver(drv);
 617         const struct vio_device_id *ids = vio_drv->id_table;
 618         const struct vio_device_id *found_id;
 619
 620         DBGENTER();
 621
 622         if (!ids)
 623                 return 0;
 624
 625         found_id = vio_match_device(ids, vio_dev);
 626         if (found_id)
 627                 return 1;
 628
 629         return 0;
 630 }
 631
 632 struct bus_type vio_bus_type = {
 633         .name = "vio",
 634         .match = vio_bus_match,
 635 };