drivers/pci/hotplug/rpadlpar_core.c

   1 /*
   2  * Interface for Dynamic Logical Partitioning of I/O Slots on
   3  * RPA-compliant PPC64 platform.
   4  *
   5  * John Rose <johnrose@austin.ibm.com>
   6  * Linda Xie <lxie@us.ibm.com>
   7  *
   8  * October 2003
   9  *
  10  * Copyright (C) 2003 IBM.
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17 #include <linux/init.h>
  18 #include <linux/pci.h>
  19 #include <asm/pci-bridge.h>
  20 #include <asm/semaphore.h>
  21 #include <asm/rtas.h>
  22 #include <asm/vio.h>
  23 #include "../pci.h"
  24 #include "rpaphp.h"
  25 #include "rpadlpar.h"
  26
  27 static DECLARE_MUTEX(rpadlpar_sem);
  28
  29 #define DLPAR_MODULE_NAME "rpadlpar_io"
  30
  31 #define NODE_TYPE_VIO  1
  32 #define NODE_TYPE_SLOT 2
  33 #define NODE_TYPE_PHB  3
  34
  35 static struct device_node *find_vio_slot_node(char *drc_name)
  36 {
  37         struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
  38         struct device_node *dn = NULL;
  39         char *name;
  40         int rc;
  41
  42         if (!parent)
  43                 return NULL;
  44
  45         while ((dn = of_get_next_child(parent, dn))) {
  46                 rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
  47                 if ((rc == 0) && (!strcmp(drc_name, name)))
  48                         break;
  49         }
  50
  51         return dn;
  52 }
  53
  54 /* Find dlpar-capable pci node that contains the specified name and type */
  55 static struct device_node *find_php_slot_pci_node(char *drc_name,
  56                                                   char *drc_type)
  57 {
  58         struct device_node *np = NULL;
  59         char *name;
  60         char *type;
  61         int rc;
  62
  63         while ((np = of_find_node_by_type(np, "pci"))) {
  64                 rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL);
  65                 if (rc == 0)
  66                         if (!strcmp(drc_name, name) && !strcmp(drc_type, type))
  67                                 break;
  68         }
  69
  70         return np;
  71 }
  72
  73 static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
  74 {
  75         struct device_node *dn;
  76
  77         dn = find_php_slot_pci_node(drc_name, "SLOT");
  78         if (dn) {
  79                 *node_type = NODE_TYPE_SLOT;
  80                 return dn;
  81         }
  82
  83         dn = find_php_slot_pci_node(drc_name, "PHB");
  84         if (dn) {
  85                 *node_type = NODE_TYPE_PHB;
  86                 return dn;
  87         }
  88
  89         dn = find_vio_slot_node(drc_name);
  90         if (dn) {
  91                 *node_type = NODE_TYPE_VIO;
  92                 return dn;
  93         }
  94
  95         return NULL;
  96 }
  97
  98 static struct slot *find_slot(struct device_node *dn)
  99 {
 100         struct list_head *tmp, *n;
 101         struct slot *slot;
 102
 103         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 104                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 105                 if (slot->dn == dn)
 106                         return slot;
 107         }
 108
 109         return NULL;
 110 }
 111
 112 static void rpadlpar_claim_one_bus(struct pci_bus *b)
 113 {
 114         struct list_head *ld;
 115         struct pci_bus *child_bus;
 116
 117         for (ld = b->devices.next; ld != &b->devices; ld = ld->next) {
 118                 struct pci_dev *dev = pci_dev_b(ld);
 119                 int i;
 120
 121                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 122                         struct resource *r = &dev->resource[i];
 123
 124                         if (r->parent || !r->start || !r->flags)
 125                                 continue;
 126                         rpaphp_claim_resource(dev, i);
 127                 }
 128         }
 129
 130         list_for_each_entry(child_bus, &b->children, node)
 131                 rpadlpar_claim_one_bus(child_bus);
 132 }
 133
 134 static int pci_add_secondary_bus(struct device_node *dn,
 135                 struct pci_dev *bridge_dev)
 136 {
 137         struct pci_dn *pdn = dn->data;
 138         struct pci_controller *hose = pdn->phb;
 139         struct pci_bus *child;
 140         u8 sec_busno;
 141
 142         /* Get busno of downstream bus */
 143         pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
 144
 145         /* Allocate and add to children of bridge_dev->bus */
 146         child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
 147         if (!child) {
 148                 printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
 149                 return -ENOMEM;
 150         }
 151
 152         sprintf(child->name, "PCI Bus #%02x", child->number);
 153
 154         /* Fixup subordinate bridge bases and resources */
 155         pcibios_fixup_bus(child);
 156
 157         /* Claim new bus resources */
 158         rpadlpar_claim_one_bus(bridge_dev->bus);
 159
 160         if (hose->last_busno < child->number)
 161                 hose->last_busno = child->number;
 162
 163         pdn->bussubno = child->number;
 164
 165         /* ioremap() for child bus, which may or may not succeed */
 166         remap_bus_range(child);
 167
 168         return 0;
 169 }
 170
 171 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 172                                         struct device_node *dev_dn)
 173 {
 174         struct pci_dev *tmp = NULL;
 175         struct device_node *child_dn;
 176
 177         list_for_each_entry(tmp, &parent->devices, bus_list) {
 178                 child_dn = pci_device_to_OF_node(tmp);
 179                 if (child_dn == dev_dn)
 180                         return tmp;
 181         }
 182         return NULL;
 183 }
 184
 185 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
 186 {
 187         struct pci_dn *pdn = dn->data;
 188         struct pci_controller *hose = pdn->phb;
 189         struct pci_dev *dev = NULL;
 190
 191         /* Scan phb bus for EADS device, adding new one to bus->devices */
 192         if (!pci_scan_single_device(hose->bus, pdn->devfn)) {
 193                 printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
 194                 return NULL;
 195         }
 196
 197         /* Add new devices to global lists.  Register in proc, sysfs. */
 198         pci_bus_add_devices(hose->bus);
 199
 200         /* Confirm new bridge dev was created */
 201         dev = dlpar_find_new_dev(hose->bus, dn);
 202         if (dev) {
 203                 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 204                         printk(KERN_ERR "%s: unexpected header type %d\n",
 205                                 __FUNCTION__, dev->hdr_type);
 206                         return NULL;
 207                 }
 208
 209                 if (pci_add_secondary_bus(dn, dev))
 210                         return NULL;
 211         }
 212
 213         return dev;
 214 }
 215
 216 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 217 {
 218         struct pci_dev *dev;
 219         int rc;
 220
 221         if (rpaphp_find_pci_bus(dn))
 222                 return -EINVAL;
 223
 224         /* Add pci bus */
 225         dev = dlpar_pci_add_bus(dn);
 226         if (!dev) {
 227                 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
 228                         drc_name);
 229                 return -EIO;
 230         }
 231
 232         if (dn->child) {
 233                 rc = rpaphp_config_pci_adapter(dev->subordinate);
 234                 if (rc < 0) {
 235                         printk(KERN_ERR "%s: unable to enable slot %s\n",
 236                                 __FUNCTION__, drc_name);
 237                         return -EIO;
 238                 }
 239         }
 240
 241         /* Add hotplug slot */
 242         if (rpaphp_add_slot(dn)) {
 243                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 244                         __FUNCTION__, drc_name);
 245                 return -EIO;
 246         }
 247         return 0;
 248 }
 249
 250 static int dlpar_remove_root_bus(struct pci_controller *phb)
 251 {
 252         struct pci_bus *phb_bus;
 253         int rc;
 254
 255         phb_bus = phb->bus;
 256         if (!(list_empty(&phb_bus->children) &&
 257               list_empty(&phb_bus->devices))) {
 258                 return -EBUSY;
 259         }
 260
 261         rc = pcibios_remove_root_bus(phb);
 262         if (rc)
 263                 return -EIO;
 264
 265         device_unregister(phb_bus->bridge);
 266         pci_remove_bus(phb_bus);
 267
 268         return 0;
 269 }
 270
 271 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
 272 {
 273         struct slot *slot;
 274         struct pci_dn *pdn;
 275         int rc = 0;
 276
 277         if (!rpaphp_find_pci_bus(dn))
 278                 return -EINVAL;
 279
 280         slot = find_slot(dn);
 281         if (slot) {
 282                 /* Remove hotplug slot */
 283                 if (rpaphp_remove_slot(slot)) {
 284                         printk(KERN_ERR
 285                                 "%s: unable to remove hotplug slot %s\n",
 286                                 __FUNCTION__, drc_name);
 287                         return -EIO;
 288                 }
 289         }
 290
 291         pdn = dn->data;
 292         BUG_ON(!pdn || !pdn->phb);
 293         rc = dlpar_remove_root_bus(pdn->phb);
 294         if (rc < 0)
 295                 return rc;
 296
 297         pdn->phb = NULL;
 298
 299         return 0;
 300 }
 301
 302 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
 303 {
 304         struct pci_controller *phb;
 305
 306         if (PCI_DN(dn)->phb) {
 307                 /* PHB already exists */
 308                 return -EINVAL;
 309         }
 310
 311         phb = init_phb_dynamic(dn);
 312         if (!phb)
 313                 return -EIO;
 314
 315         if (rpaphp_add_slot(dn)) {
 316                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 317                         __FUNCTION__, drc_name);
 318                 return -EIO;
 319         }
 320         return 0;
 321 }
 322
 323 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
 324 {
 325         if (vio_find_node(dn))
 326                 return -EINVAL;
 327
 328         if (!vio_register_device_node(dn)) {
 329                 printk(KERN_ERR
 330                         "%s: failed to register vio node %s\n",
 331                         __FUNCTION__, drc_name);
 332                 return -EIO;
 333         }
 334         return 0;
 335 }
 336
 337 /**
 338  * dlpar_add_slot - DLPAR add an I/O Slot
 339  * @drc_name: drc-name of newly added slot
 340  *
 341  * Make the hotplug module and the kernel aware
 342  * of a newly added I/O Slot.
 343  * Return Codes -
 344  * 0                    Success
 345  * -ENODEV              Not a valid drc_name
 346  * -EINVAL              Slot already added
 347  * -ERESTARTSYS         Signalled before obtaining lock
 348  * -EIO                 Internal PCI Error
 349  */
 350 int dlpar_add_slot(char *drc_name)
 351 {
 352         struct device_node *dn = NULL;
 353         int node_type;
 354         int rc = -EIO;
 355
 356         if (down_interruptible(&rpadlpar_sem))
 357                 return -ERESTARTSYS;
 358
 359         /* Find newly added node */
 360         dn = find_dlpar_node(drc_name, &node_type);
 361         if (!dn) {
 362                 rc = -ENODEV;
 363                 goto exit;
 364         }
 365
 366         switch (node_type) {
 367                 case NODE_TYPE_VIO:
 368                         rc = dlpar_add_vio_slot(drc_name, dn);
 369                         break;
 370                 case NODE_TYPE_SLOT:
 371                         rc = dlpar_add_pci_slot(drc_name, dn);
 372                         break;
 373                 case NODE_TYPE_PHB:
 374                         rc = dlpar_add_phb(drc_name, dn);
 375                         break;
 376         }
 377
 378         printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
 379 exit:
 380         up(&rpadlpar_sem);
 381         return rc;
 382 }
 383
 384 /**
 385  * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
 386  * @drc_name: drc-name of newly added slot
 387  *
 388  * Remove the kernel and hotplug representations
 389  * of an I/O Slot.
 390  * Return Codes:
 391  * 0                    Success
 392  * -EINVAL              Vio dev doesn't exist
 393  */
 394 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
 395 {
 396         struct vio_dev *vio_dev;
 397
 398         vio_dev = vio_find_node(dn);
 399         if (!vio_dev)
 400                 return -EINVAL;
 401
 402         vio_unregister_device(vio_dev);
 403         return 0;
 404 }
 405
 406 /**
 407  * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
 408  * @drc_name: drc-name of newly added slot
 409  *
 410  * Remove the kernel and hotplug representations
 411  * of a PCI I/O Slot.
 412  * Return Codes:
 413  * 0                    Success
 414  * -ENODEV              Not a valid drc_name
 415  * -EIO                 Internal PCI Error
 416  */
 417 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
 418 {
 419         struct pci_bus *bus;
 420         struct slot *slot;
 421
 422         bus = rpaphp_find_pci_bus(dn);
 423         if (!bus)
 424                 return -EINVAL;
 425
 426         slot = find_slot(dn);
 427         if (slot) {
 428                 /* Remove hotplug slot */
 429                 if (rpaphp_remove_slot(slot)) {
 430                         printk(KERN_ERR
 431                                 "%s: unable to remove hotplug slot %s\n",
 432                                 __FUNCTION__, drc_name);
 433                         return -EIO;
 434                 }
 435         }
 436
 437         if (unmap_bus_range(bus)) {
 438                 printk(KERN_ERR "%s: failed to unmap bus range\n",
 439                         __FUNCTION__);
 440                 return -ERANGE;
 441         }
 442
 443         BUG_ON(!bus->self);
 444         pci_remove_bus_device(bus->self);
 445         return 0;
 446 }
 447
 448 /**
 449  * dlpar_remove_slot - DLPAR remove an I/O Slot
 450  * @drc_name: drc-name of newly added slot
 451  *
 452  * Remove the kernel and hotplug representations
 453  * of an I/O Slot.
 454  * Return Codes:
 455  * 0                    Success
 456  * -ENODEV              Not a valid drc_name
 457  * -EINVAL              Slot already removed
 458  * -ERESTARTSYS         Signalled before obtaining lock
 459  * -EIO                 Internal Error
 460  */
 461 int dlpar_remove_slot(char *drc_name)
 462 {
 463         struct device_node *dn;
 464         int node_type;
 465         int rc = 0;
 466
 467         if (down_interruptible(&rpadlpar_sem))
 468                 return -ERESTARTSYS;
 469
 470         dn = find_dlpar_node(drc_name, &node_type);
 471         if (!dn) {
 472                 rc = -ENODEV;
 473                 goto exit;
 474         }
 475
 476         switch (node_type) {
 477                 case NODE_TYPE_VIO:
 478                         rc = dlpar_remove_vio_slot(drc_name, dn);
 479                         break;
 480                 case NODE_TYPE_PHB:
 481                         rc = dlpar_remove_phb(drc_name, dn);
 482                         break;
 483                 case NODE_TYPE_SLOT:
 484                         rc = dlpar_remove_pci_slot(drc_name, dn);
 485                         break;
 486         }
 487         printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
 488 exit:
 489         up(&rpadlpar_sem);
 490         return rc;
 491 }
 492
 493 static inline int is_dlpar_capable(void)
 494 {
 495         int rc = rtas_token("ibm,configure-connector");
 496
 497         return (int) (rc != RTAS_UNKNOWN_SERVICE);
 498 }
 499
 500 int __init rpadlpar_io_init(void)
 501 {
 502         int rc = 0;
 503
 504         if (!is_dlpar_capable()) {
 505                 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
 506                         __FUNCTION__);
 507                 return -EPERM;
 508         }
 509
 510         rc = dlpar_sysfs_init();
 511         return rc;
 512 }
 513
 514 void rpadlpar_io_exit(void)
 515 {
 516         dlpar_sysfs_exit();
 517         return;
 518 }
 519
 520 module_init(rpadlpar_io_init);
 521 module_exit(rpadlpar_io_exit);
 522 MODULE_LICENSE("GPL");