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