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 <linux/mutex.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 DEFINE_MUTEX(rpadlpar_mutex);
  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 struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 116                                         struct device_node *dev_dn)
 117 {
 118         struct pci_dev *tmp = NULL;
 119         struct device_node *child_dn;
 120
 121         list_for_each_entry(tmp, &parent->devices, bus_list) {
 122                 child_dn = pci_device_to_OF_node(tmp);
 123                 if (child_dn == dev_dn)
 124                         return tmp;
 125         }
 126         return NULL;
 127 }
 128
 129 static void dlpar_pci_add_bus(struct device_node *dn)
 130 {
 131         struct pci_dn *pdn = PCI_DN(dn);
 132         struct pci_controller *phb = pdn->phb;
 133         struct pci_dev *dev = NULL;
 134
 135         eeh_add_device_tree_early(dn);
 136
 137         /* Add EADS device to PHB bus, adding new entry to bus->devices */
 138         dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
 139         if (!dev) {
 140                 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
 141                                 __FUNCTION__, dn->full_name);
 142                 return;
 143         }
 144
 145         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 146             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 147                 of_scan_pci_bridge(dn, dev);
 148
 149         pcibios_fixup_new_pci_devices(dev->subordinate,0);
 150
 151         /* Claim new bus resources */
 152         pcibios_claim_one_bus(dev->bus);
 153
 154         /* ioremap() for child bus, which may or may not succeed */
 155         remap_bus_range(dev->subordinate);
 156
 157         /* Add new devices to global lists.  Register in proc, sysfs. */
 158         pci_bus_add_devices(phb->bus);
 159 }
 160
 161 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 162 {
 163         struct pci_dev *dev;
 164         struct pci_controller *phb;
 165
 166         if (pcibios_find_pci_bus(dn))
 167                 return -EINVAL;
 168
 169         /* Add pci bus */
 170         dlpar_pci_add_bus(dn);
 171
 172         /* Confirm new bridge dev was created */
 173         phb = PCI_DN(dn)->phb;
 174         dev = dlpar_find_new_dev(phb->bus, dn);
 175
 176         if (!dev) {
 177                 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
 178                         drc_name);
 179                 return -EIO;
 180         }
 181
 182         if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 183                 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
 184                         __FUNCTION__, dev->hdr_type, drc_name);
 185                 return -EIO;
 186         }
 187
 188         /* Add hotplug slot */
 189         if (rpaphp_add_slot(dn)) {
 190                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 191                         __FUNCTION__, drc_name);
 192                 return -EIO;
 193         }
 194         return 0;
 195 }
 196
 197 static int dlpar_remove_root_bus(struct pci_controller *phb)
 198 {
 199         struct pci_bus *phb_bus;
 200         int rc;
 201
 202         phb_bus = phb->bus;
 203         if (!(list_empty(&phb_bus->children) &&
 204               list_empty(&phb_bus->devices))) {
 205                 return -EBUSY;
 206         }
 207
 208         rc = pcibios_remove_root_bus(phb);
 209         if (rc)
 210                 return -EIO;
 211
 212         device_unregister(phb_bus->bridge);
 213         pci_remove_bus(phb_bus);
 214
 215         return 0;
 216 }
 217
 218 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
 219 {
 220         struct slot *slot;
 221         struct pci_dn *pdn;
 222         int rc = 0;
 223
 224         if (!pcibios_find_pci_bus(dn))
 225                 return -EINVAL;
 226
 227         slot = find_slot(dn);
 228         if (slot) {
 229                 /* Remove hotplug slot */
 230                 if (rpaphp_deregister_slot(slot)) {
 231                         printk(KERN_ERR
 232                                 "%s: unable to remove hotplug slot %s\n",
 233                                 __FUNCTION__, drc_name);
 234                         return -EIO;
 235                 }
 236         }
 237
 238         pdn = dn->data;
 239         BUG_ON(!pdn || !pdn->phb);
 240         rc = dlpar_remove_root_bus(pdn->phb);
 241         if (rc < 0)
 242                 return rc;
 243
 244         pdn->phb = NULL;
 245
 246         return 0;
 247 }
 248
 249 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
 250 {
 251         struct pci_controller *phb;
 252
 253         if (PCI_DN(dn) && PCI_DN(dn)->phb) {
 254                 /* PHB already exists */
 255                 return -EINVAL;
 256         }
 257
 258         phb = init_phb_dynamic(dn);
 259         if (!phb)
 260                 return -EIO;
 261
 262         if (rpaphp_add_slot(dn)) {
 263                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 264                         __FUNCTION__, drc_name);
 265                 return -EIO;
 266         }
 267         return 0;
 268 }
 269
 270 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
 271 {
 272         if (vio_find_node(dn))
 273                 return -EINVAL;
 274
 275         if (!vio_register_device_node(dn)) {
 276                 printk(KERN_ERR
 277                         "%s: failed to register vio node %s\n",
 278                         __FUNCTION__, drc_name);
 279                 return -EIO;
 280         }
 281         return 0;
 282 }
 283
 284 /**
 285  * dlpar_add_slot - DLPAR add an I/O Slot
 286  * @drc_name: drc-name of newly added slot
 287  *
 288  * Make the hotplug module and the kernel aware
 289  * of a newly added I/O Slot.
 290  * Return Codes -
 291  * 0                    Success
 292  * -ENODEV              Not a valid drc_name
 293  * -EINVAL              Slot already added
 294  * -ERESTARTSYS         Signalled before obtaining lock
 295  * -EIO                 Internal PCI Error
 296  */
 297 int dlpar_add_slot(char *drc_name)
 298 {
 299         struct device_node *dn = NULL;
 300         int node_type;
 301         int rc = -EIO;
 302
 303         if (mutex_lock_interruptible(&rpadlpar_mutex))
 304                 return -ERESTARTSYS;
 305
 306         /* Find newly added node */
 307         dn = find_dlpar_node(drc_name, &node_type);
 308         if (!dn) {
 309                 rc = -ENODEV;
 310                 goto exit;
 311         }
 312
 313         switch (node_type) {
 314                 case NODE_TYPE_VIO:
 315                         rc = dlpar_add_vio_slot(drc_name, dn);
 316                         break;
 317                 case NODE_TYPE_SLOT:
 318                         rc = dlpar_add_pci_slot(drc_name, dn);
 319                         break;
 320                 case NODE_TYPE_PHB:
 321                         rc = dlpar_add_phb(drc_name, dn);
 322                         break;
 323         }
 324
 325         printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
 326 exit:
 327         mutex_unlock(&rpadlpar_mutex);
 328         return rc;
 329 }
 330
 331 /**
 332  * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
 333  * @drc_name: drc-name of newly added slot
 334  *
 335  * Remove the kernel and hotplug representations
 336  * of an I/O Slot.
 337  * Return Codes:
 338  * 0                    Success
 339  * -EINVAL              Vio dev doesn't exist
 340  */
 341 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
 342 {
 343         struct vio_dev *vio_dev;
 344
 345         vio_dev = vio_find_node(dn);
 346         if (!vio_dev)
 347                 return -EINVAL;
 348
 349         vio_unregister_device(vio_dev);
 350         return 0;
 351 }
 352
 353 /**
 354  * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
 355  * @drc_name: drc-name of newly added slot
 356  *
 357  * Remove the kernel and hotplug representations
 358  * of a PCI I/O Slot.
 359  * Return Codes:
 360  * 0                    Success
 361  * -ENODEV              Not a valid drc_name
 362  * -EIO                 Internal PCI Error
 363  */
 364 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
 365 {
 366         struct pci_bus *bus;
 367         struct slot *slot;
 368
 369         bus = pcibios_find_pci_bus(dn);
 370         if (!bus)
 371                 return -EINVAL;
 372
 373         slot = find_slot(dn);
 374         if (slot) {
 375                 /* Remove hotplug slot */
 376                 if (rpaphp_deregister_slot(slot)) {
 377                         printk(KERN_ERR
 378                                 "%s: unable to remove hotplug slot %s\n",
 379                                 __FUNCTION__, drc_name);
 380                         return -EIO;
 381                 }
 382         } else {
 383                 struct pci_dev *dev, *tmp;
 384                 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
 385                         eeh_remove_bus_device(dev);
 386                         pci_remove_bus_device(dev);
 387                 }
 388         }
 389
 390         if (unmap_bus_range(bus)) {
 391                 printk(KERN_ERR "%s: failed to unmap bus range\n",
 392                         __FUNCTION__);
 393                 return -ERANGE;
 394         }
 395
 396         BUG_ON(!bus->self);
 397         pci_remove_bus_device(bus->self);
 398         return 0;
 399 }
 400
 401 /**
 402  * dlpar_remove_slot - DLPAR remove an I/O Slot
 403  * @drc_name: drc-name of newly added slot
 404  *
 405  * Remove the kernel and hotplug representations
 406  * of an I/O Slot.
 407  * Return Codes:
 408  * 0                    Success
 409  * -ENODEV              Not a valid drc_name
 410  * -EINVAL              Slot already removed
 411  * -ERESTARTSYS         Signalled before obtaining lock
 412  * -EIO                 Internal Error
 413  */
 414 int dlpar_remove_slot(char *drc_name)
 415 {
 416         struct device_node *dn;
 417         int node_type;
 418         int rc = 0;
 419
 420         if (mutex_lock_interruptible(&rpadlpar_mutex))
 421                 return -ERESTARTSYS;
 422
 423         dn = find_dlpar_node(drc_name, &node_type);
 424         if (!dn) {
 425                 rc = -ENODEV;
 426                 goto exit;
 427         }
 428
 429         switch (node_type) {
 430                 case NODE_TYPE_VIO:
 431                         rc = dlpar_remove_vio_slot(drc_name, dn);
 432                         break;
 433                 case NODE_TYPE_PHB:
 434                         rc = dlpar_remove_phb(drc_name, dn);
 435                         break;
 436                 case NODE_TYPE_SLOT:
 437                         rc = dlpar_remove_pci_slot(drc_name, dn);
 438                         break;
 439         }
 440         printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
 441 exit:
 442         mutex_unlock(&rpadlpar_mutex);
 443         return rc;
 444 }
 445
 446 static inline int is_dlpar_capable(void)
 447 {
 448         int rc = rtas_token("ibm,configure-connector");
 449
 450         return (int) (rc != RTAS_UNKNOWN_SERVICE);
 451 }
 452
 453 int __init rpadlpar_io_init(void)
 454 {
 455         int rc = 0;
 456
 457         if (!is_dlpar_capable()) {
 458                 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
 459                         __FUNCTION__);
 460                 return -EPERM;
 461         }
 462
 463         rc = dlpar_sysfs_init();
 464         return rc;
 465 }
 466
 467 void rpadlpar_io_exit(void)
 468 {
 469         dlpar_sysfs_exit();
 470         return;
 471 }
 472
 473 module_init(rpadlpar_io_init);
 474 module_exit(rpadlpar_io_exit);
 475 MODULE_LICENSE("GPL");