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  * @dn: target &device_node
 104  *
 105  * This routine will return the hotplug slot structure
 106  * for a given device node. Note that built-in PCI slots
 107  * may be dlpar-able, but not hot-pluggable, so this routine
 108  * will return NULL for built-in PCI slots.
 109  */
 110 static struct slot *find_php_slot(struct device_node *dn)
 111 {
 112         struct list_head *tmp, *n;
 113         struct slot *slot;
 114
 115         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 116                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 117                 if (slot->dn == dn)
 118                         return slot;
 119         }
 120
 121         return NULL;
 122 }
 123
 124 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 125                                         struct device_node *dev_dn)
 126 {
 127         struct pci_dev *tmp = NULL;
 128         struct device_node *child_dn;
 129
 130         list_for_each_entry(tmp, &parent->devices, bus_list) {
 131                 child_dn = pci_device_to_OF_node(tmp);
 132                 if (child_dn == dev_dn)
 133                         return tmp;
 134         }
 135         return NULL;
 136 }
 137
 138 static void dlpar_pci_add_bus(struct device_node *dn)
 139 {
 140         struct pci_dn *pdn = PCI_DN(dn);
 141         struct pci_controller *phb = pdn->phb;
 142         struct pci_dev *dev = NULL;
 143
 144         eeh_add_device_tree_early(dn);
 145
 146         /* Add EADS device to PHB bus, adding new entry to bus->devices */
 147         dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
 148         if (!dev) {
 149                 printk(KERN_ERR "%s: failed to create pci dev for %s\n",
 150                                 __FUNCTION__, dn->full_name);
 151                 return;
 152         }
 153
 154         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 155             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 156                 of_scan_pci_bridge(dn, dev);
 157
 158         pcibios_fixup_new_pci_devices(dev->subordinate);
 159
 160         /* Claim new bus resources */
 161         pcibios_claim_one_bus(dev->bus);
 162
 163         /* Map IO space for child bus, which may or may not succeed */
 164         pcibios_map_io_space(dev->subordinate);
 165
 166         /* Add new devices to global lists.  Register in proc, sysfs. */
 167         pci_bus_add_devices(phb->bus);
 168 }
 169
 170 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 171 {
 172         struct pci_dev *dev;
 173         struct pci_controller *phb;
 174
 175         if (pcibios_find_pci_bus(dn))
 176                 return -EINVAL;
 177
 178         /* Add pci bus */
 179         dlpar_pci_add_bus(dn);
 180
 181         /* Confirm new bridge dev was created */
 182         phb = PCI_DN(dn)->phb;
 183         dev = dlpar_find_new_dev(phb->bus, dn);
 184
 185         if (!dev) {
 186                 printk(KERN_ERR "%s: unable to add bus %s\n", __FUNCTION__,
 187                         drc_name);
 188                 return -EIO;
 189         }
 190
 191         if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 192                 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
 193                         __FUNCTION__, dev->hdr_type, drc_name);
 194                 return -EIO;
 195         }
 196
 197         /* Add hotplug slot */
 198         if (rpaphp_add_slot(dn)) {
 199                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 200                         __FUNCTION__, drc_name);
 201                 return -EIO;
 202         }
 203         return 0;
 204 }
 205
 206 static int dlpar_remove_root_bus(struct pci_controller *phb)
 207 {
 208         struct pci_bus *phb_bus;
 209         int rc;
 210
 211         phb_bus = phb->bus;
 212         if (!(list_empty(&phb_bus->children) &&
 213               list_empty(&phb_bus->devices))) {
 214                 return -EBUSY;
 215         }
 216
 217         rc = pcibios_remove_root_bus(phb);
 218         if (rc)
 219                 return -EIO;
 220
 221         device_unregister(phb_bus->bridge);
 222         pci_remove_bus(phb_bus);
 223
 224         return 0;
 225 }
 226
 227 static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
 228 {
 229         struct slot *slot;
 230         struct pci_dn *pdn;
 231         int rc = 0;
 232
 233         if (!pcibios_find_pci_bus(dn))
 234                 return -EINVAL;
 235
 236         /* If pci slot is hotplugable, use hotplug to remove it */
 237         slot = find_php_slot(dn);
 238         if (slot) {
 239                 if (rpaphp_deregister_slot(slot)) {
 240                         printk(KERN_ERR
 241                                 "%s: unable to remove hotplug slot %s\n",
 242                                 __FUNCTION__, drc_name);
 243                         return -EIO;
 244                 }
 245         }
 246
 247         pdn = dn->data;
 248         BUG_ON(!pdn || !pdn->phb);
 249         rc = dlpar_remove_root_bus(pdn->phb);
 250         if (rc < 0)
 251                 return rc;
 252
 253         pdn->phb = NULL;
 254
 255         return 0;
 256 }
 257
 258 static int dlpar_add_phb(char *drc_name, struct device_node *dn)
 259 {
 260         struct pci_controller *phb;
 261
 262         if (PCI_DN(dn) && PCI_DN(dn)->phb) {
 263                 /* PHB already exists */
 264                 return -EINVAL;
 265         }
 266
 267         phb = init_phb_dynamic(dn);
 268         if (!phb)
 269                 return -EIO;
 270
 271         if (rpaphp_add_slot(dn)) {
 272                 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
 273                         __FUNCTION__, drc_name);
 274                 return -EIO;
 275         }
 276         return 0;
 277 }
 278
 279 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
 280 {
 281         if (vio_find_node(dn))
 282                 return -EINVAL;
 283
 284         if (!vio_register_device_node(dn)) {
 285                 printk(KERN_ERR
 286                         "%s: failed to register vio node %s\n",
 287                         __FUNCTION__, drc_name);
 288                 return -EIO;
 289         }
 290         return 0;
 291 }
 292
 293 /**
 294  * dlpar_add_slot - DLPAR add an I/O Slot
 295  * @drc_name: drc-name of newly added slot
 296  *
 297  * Make the hotplug module and the kernel aware 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  * @dn: &device_node
 343  *
 344  * Remove the kernel and hotplug representations 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_pci_slot - DLPAR remove a PCI I/O Slot
 363  * @drc_name: drc-name of newly added slot
 364  * @dn: &device_node
 365  *
 366  * Remove the kernel and hotplug representations 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 of an I/O Slot.
 409  * Return Codes:
 410  * 0                    Success
 411  * -ENODEV              Not a valid drc_name
 412  * -EINVAL              Slot already removed
 413  * -ERESTARTSYS         Signalled before obtaining lock
 414  * -EIO                 Internal Error
 415  */
 416 int dlpar_remove_slot(char *drc_name)
 417 {
 418         struct device_node *dn;
 419         int node_type;
 420         int rc = 0;
 421
 422         if (mutex_lock_interruptible(&rpadlpar_mutex))
 423                 return -ERESTARTSYS;
 424
 425         dn = find_dlpar_node(drc_name, &node_type);
 426         if (!dn) {
 427                 rc = -ENODEV;
 428                 goto exit;
 429         }
 430
 431         switch (node_type) {
 432                 case NODE_TYPE_VIO:
 433                         rc = dlpar_remove_vio_slot(drc_name, dn);
 434                         break;
 435                 case NODE_TYPE_PHB:
 436                         rc = dlpar_remove_phb(drc_name, dn);
 437                         break;
 438                 case NODE_TYPE_SLOT:
 439                         rc = dlpar_remove_pci_slot(drc_name, dn);
 440                         break;
 441         }
 442         printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
 443 exit:
 444         mutex_unlock(&rpadlpar_mutex);
 445         return rc;
 446 }
 447
 448 static inline int is_dlpar_capable(void)
 449 {
 450         int rc = rtas_token("ibm,configure-connector");
 451
 452         return (int) (rc != RTAS_UNKNOWN_SERVICE);
 453 }
 454
 455 int __init rpadlpar_io_init(void)
 456 {
 457         int rc = 0;
 458
 459         if (!is_dlpar_capable()) {
 460                 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
 461                         __FUNCTION__);
 462                 return -EPERM;
 463         }
 464
 465         rc = dlpar_sysfs_init();
 466         return rc;
 467 }
 468
 469 void rpadlpar_io_exit(void)
 470 {
 471         dlpar_sysfs_exit();
 472         return;
 473 }
 474
 475 module_init(rpadlpar_io_init);
 476 module_exit(rpadlpar_io_exit);
 477 MODULE_LICENSE("GPL");