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_name(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 /**
 102  * find_php_slot - return hotplug slot structure for device node
 103  *
 104  * This routine will return the hotplug slot structure
 105  * for a given device node. Note that built-in PCI slots
 106  * may be dlpar-able, but not hot-pluggable, so this routine
 107  * will return NULL for built-in PCI slots.
 108  */
 109 static struct slot *find_php_slot(struct device_node *dn)
 110 {
 111         struct list_head *tmp, *n;
 112         struct slot *slot;
 113
 114         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 115                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 116                 if (slot->dn == dn)
 117                         return slot;
 118         }
 119
 120         return NULL;
 121 }
 122
 123 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 124                                         struct device_node *dev_dn)
 125 {
 126         struct pci_dev *tmp = NULL;
 127         struct device_node *child_dn;
 128
 129         list_for_each_entry(tmp, &parent->devices, bus_list) {
 130                 child_dn = pci_device_to_OF_node(tmp);
 131                 if (child_dn == dev_dn)
 132                         return tmp;
 133         }
 134         return NULL;
 135 }
 136
 137 static void dlpar_pci_add_bus(struct device_node *dn)
 138 {
 139         struct pci_dn *pdn = PCI_DN(dn);
 140         struct pci_controller *phb = pdn->phb;
 141         struct pci_dev *dev = NULL;
 142
 143         eeh_add_device_tree_early(dn);
 144
 145         /* Add EADS device to PHB bus, adding new entry to bus->devices */
 146         dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
 147         if (!dev) {
 148                 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
 149                                 __FUNCTION__, dn->full_name);
 150                 return;
 151         }
 152
 153         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 154             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 155                 of_scan_pci_bridge(dn, dev);
 156
 157         pcibios_fixup_new_pci_devices(dev->subordinate,0);
 158
 159         /* Claim new bus resources */
 160         pcibios_claim_one_bus(dev->bus);
 161
 162         /* Map IO space for child bus, which may or may not succeed */
 163         pcibios_map_io_space(dev->subordinate);
 164
 165         /* Add new devices to global lists.  Register in proc, sysfs. */
 166         pci_bus_add_devices(phb->bus);
 167 }
 168
 169 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 170 {
 171         struct pci_dev *dev;
 172         struct pci_controller *phb;
 173
 174         if (pcibios_find_pci_bus(dn))
 175                 return -EINVAL;
 176
 177         /* Add pci bus */
 178         dlpar_pci_add_bus(dn);
 179
 180         /* Confirm new bridge dev was created */
 181         phb = PCI_DN(dn)->phb;
 182         dev = dlpar_find_new_dev(phb->bus, dn);
 183
 184         if (!dev) {
 185                 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
 186                         drc_name);
 187                 return -EIO;
 188         }
 189
 190         if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 191                 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
 192                         __FUNCTION__, dev->hdr_type, drc_name);
 193                 return -EIO;
 194         }
 195
 196         /* Add hotplug slot */
 197         if (rpaphp_add_slot(dn)) {
 198                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 199                         __FUNCTION__, drc_name);
 200                 return -EIO;
 201         }
 202         return 0;
 203 }
 204
 205 static int dlpar_remove_root_bus(struct pci_controller *phb)
 206 {
 207         struct pci_bus *phb_bus;
 208         int rc;
 209
 210         phb_bus = phb->bus;
 211         if (!(list_empty(&phb_bus->children) &&
 212               list_empty(&phb_bus->devices))) {
 213                 return -EBUSY;
 214         }
 215
 216         rc = pcibios_remove_root_bus(phb);
 217         if (rc)
 218                 return -EIO;
 219
 220         device_unregister(phb_bus->bridge);
 221         pci_remove_bus(phb_bus);
 222
 223         return 0;
 224 }
 225
 226 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
 227 {
 228         struct slot *slot;
 229         struct pci_dn *pdn;
 230         int rc = 0;
 231
 232         if (!pcibios_find_pci_bus(dn))
 233                 return -EINVAL;
 234
 235         /* If pci slot is hotplugable, use hotplug to remove it */
 236         slot = find_php_slot(dn);
 237         if (slot) {
 238                 if (rpaphp_deregister_slot(slot)) {
 239                         printk(KERN_ERR
 240                                 "%s: unable to remove hotplug slot %s\n",
 241                                 __FUNCTION__, drc_name);
 242                         return -EIO;
 243                 }
 244         }
 245
 246         pdn = dn->data;
 247         BUG_ON(!pdn || !pdn->phb);
 248         rc = dlpar_remove_root_bus(pdn->phb);
 249         if (rc < 0)
 250                 return rc;
 251
 252         pdn->phb = NULL;
 253
 254         return 0;
 255 }
 256
 257 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
 258 {
 259         struct pci_controller *phb;
 260
 261         if (PCI_DN(dn) && PCI_DN(dn)->phb) {
 262                 /* PHB already exists */
 263                 return -EINVAL;
 264         }
 265
 266         phb = init_phb_dynamic(dn);
 267         if (!phb)
 268                 return -EIO;
 269
 270         if (rpaphp_add_slot(dn)) {
 271                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 272                         __FUNCTION__, drc_name);
 273                 return -EIO;
 274         }
 275         return 0;
 276 }
 277
 278 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
 279 {
 280         if (vio_find_node(dn))
 281                 return -EINVAL;
 282
 283         if (!vio_register_device_node(dn)) {
 284                 printk(KERN_ERR
 285                         "%s: failed to register vio node %s\n",
 286                         __FUNCTION__, drc_name);
 287                 return -EIO;
 288         }
 289         return 0;
 290 }
 291
 292 /**
 293  * dlpar_add_slot - DLPAR add an I/O Slot
 294  * @drc_name: drc-name of newly added slot
 295  *
 296  * Make the hotplug module and the kernel aware
 297  * of a newly added I/O Slot.
 298  * Return Codes -
 299  * 0                    Success
 300  * -ENODEV              Not a valid drc_name
 301  * -EINVAL              Slot already added
 302  * -ERESTARTSYS         Signalled before obtaining lock
 303  * -EIO                 Internal PCI Error
 304  */
 305 int dlpar_add_slot(char *drc_name)
 306 {
 307         struct device_node *dn = NULL;
 308         int node_type;
 309         int rc = -EIO;
 310
 311         if (mutex_lock_interruptible(&rpadlpar_mutex))
 312                 return -ERESTARTSYS;
 313
 314         /* Find newly added node */
 315         dn = find_dlpar_node(drc_name, &node_type);
 316         if (!dn) {
 317                 rc = -ENODEV;
 318                 goto exit;
 319         }
 320
 321         switch (node_type) {
 322                 case NODE_TYPE_VIO:
 323                         rc = dlpar_add_vio_slot(drc_name, dn);
 324                         break;
 325                 case NODE_TYPE_SLOT:
 326                         rc = dlpar_add_pci_slot(drc_name, dn);
 327                         break;
 328                 case NODE_TYPE_PHB:
 329                         rc = dlpar_add_phb(drc_name, dn);
 330                         break;
 331         }
 332
 333         printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
 334 exit:
 335         mutex_unlock(&rpadlpar_mutex);
 336         return rc;
 337 }
 338
 339 /**
 340  * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
 341  * @drc_name: drc-name of newly added slot
 342  *
 343  * Remove the kernel and hotplug representations
 344  * of an I/O Slot.
 345  * Return Codes:
 346  * 0                    Success
 347  * -EINVAL              Vio dev doesn't exist
 348  */
 349 static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
 350 {
 351         struct vio_dev *vio_dev;
 352
 353         vio_dev = vio_find_node(dn);
 354         if (!vio_dev)
 355                 return -EINVAL;
 356
 357         vio_unregister_device(vio_dev);
 358         return 0;
 359 }
 360
 361 /**
 362  * dlpar_remove_slot - DLPAR remove a PCI I/O Slot
 363  * @drc_name: drc-name of newly added slot
 364  *
 365  * Remove the kernel and hotplug representations
 366  * of a PCI I/O Slot.
 367  * Return Codes:
 368  * 0                    Success
 369  * -ENODEV              Not a valid drc_name
 370  * -EIO                 Internal PCI Error
 371  */
 372 int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
 373 {
 374         struct pci_bus *bus;
 375         struct slot *slot;
 376
 377         bus = pcibios_find_pci_bus(dn);
 378         if (!bus)
 379                 return -EINVAL;
 380
 381         /* If pci slot is hotplugable, use hotplug to remove it */
 382         slot = find_php_slot(dn);
 383         if (slot) {
 384                 if (rpaphp_deregister_slot(slot)) {
 385                         printk(KERN_ERR
 386                                 "%s: unable to remove hotplug slot %s\n",
 387                                 __FUNCTION__, drc_name);
 388                         return -EIO;
 389                 }
 390         } else
 391                 pcibios_remove_pci_devices(bus);
 392
 393         if (pcibios_unmap_io_space(bus)) {
 394                 printk(KERN_ERR "%s: failed to unmap bus range\n",
 395                         __FUNCTION__);
 396                 return -ERANGE;
 397         }
 398
 399         BUG_ON(!bus->self);
 400         pci_remove_bus_device(bus->self);
 401         return 0;
 402 }
 403
 404 /**
 405  * dlpar_remove_slot - DLPAR remove an I/O Slot
 406  * @drc_name: drc-name of newly added slot
 407  *
 408  * Remove the kernel and hotplug representations
 409  * of an I/O Slot.
 410  * Return Codes:
 411  * 0                    Success
 412  * -ENODEV              Not a valid drc_name
 413  * -EINVAL              Slot already removed
 414  * -ERESTARTSYS         Signalled before obtaining lock
 415  * -EIO                 Internal Error
 416  */
 417 int dlpar_remove_slot(char *drc_name)
 418 {
 419         struct device_node *dn;
 420         int node_type;
 421         int rc = 0;
 422
 423         if (mutex_lock_interruptible(&rpadlpar_mutex))
 424                 return -ERESTARTSYS;
 425
 426         dn = find_dlpar_node(drc_name, &node_type);
 427         if (!dn) {
 428                 rc = -ENODEV;
 429                 goto exit;
 430         }
 431
 432         switch (node_type) {
 433                 case NODE_TYPE_VIO:
 434                         rc = dlpar_remove_vio_slot(drc_name, dn);
 435                         break;
 436                 case NODE_TYPE_PHB:
 437                         rc = dlpar_remove_phb(drc_name, dn);
 438                         break;
 439                 case NODE_TYPE_SLOT:
 440                         rc = dlpar_remove_pci_slot(drc_name, dn);
 441                         break;
 442         }
 443         printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
 444 exit:
 445         mutex_unlock(&rpadlpar_mutex);
 446         return rc;
 447 }
 448
 449 static inline int is_dlpar_capable(void)
 450 {
 451         int rc = rtas_token("ibm,configure-connector");
 452
 453         return (int) (rc != RTAS_UNKNOWN_SERVICE);
 454 }
 455
 456 int __init rpadlpar_io_init(void)
 457 {
 458         int rc = 0;
 459
 460         if (!is_dlpar_capable()) {
 461                 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
 462                         __FUNCTION__);
 463                 return -EPERM;
 464         }
 465
 466         rc = dlpar_sysfs_init();
 467         return rc;
 468 }
 469
 470 void rpadlpar_io_exit(void)
 471 {
 472         dlpar_sysfs_exit();
 473         return;
 474 }
 475
 476 module_init(rpadlpar_io_init);
 477 module_exit(rpadlpar_io_exit);
 478 MODULE_LICENSE("GPL");