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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Interface for Dynamic Logical Partitioning of I/O Slots on4 * RPA-compliant PPC64 platform.5 *6 * John Rose <johnrose@austin.ibm.com>7 * Linda Xie <lxie@us.ibm.com>8 *9 * October 200310 *11 * Copyright (C) 2003 IBM.12 */13 14#undef DEBUG15 16#include <linux/init.h>17#include <linux/module.h>18#include <linux/of.h>19#include <linux/pci.h>20#include <linux/string.h>21#include <linux/vmalloc.h>22 23#include <asm/pci-bridge.h>24#include <linux/mutex.h>25#include <asm/rtas.h>26#include <asm/vio.h>27#include <linux/firmware.h>28 29#include "../pci.h"30#include "rpaphp.h"31#include "rpadlpar.h"32 33static DEFINE_MUTEX(rpadlpar_mutex);34 35#define DLPAR_MODULE_NAME "rpadlpar_io"36 37#define NODE_TYPE_VIO 138#define NODE_TYPE_SLOT 239#define NODE_TYPE_PHB 340 41static struct device_node *find_vio_slot_node(char *drc_name)42{43 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");44 struct device_node *dn;45 int rc;46 47 if (!parent)48 return NULL;49 50 for_each_child_of_node(parent, dn) {51 rc = rpaphp_check_drc_props(dn, drc_name, NULL);52 if (rc == 0)53 break;54 }55 of_node_put(parent);56 57 return dn;58}59 60/* Find dlpar-capable pci node that contains the specified name and type */61static struct device_node *find_php_slot_pci_node(char *drc_name,62 char *drc_type)63{64 struct device_node *np;65 int rc;66 67 for_each_node_by_name(np, "pci") {68 rc = rpaphp_check_drc_props(np, drc_name, drc_type);69 if (rc == 0)70 break;71 }72 73 return np;74}75 76/* Returns a device_node with its reference count incremented */77static struct device_node *find_dlpar_node(char *drc_name, int *node_type)78{79 struct device_node *dn;80 81 dn = find_php_slot_pci_node(drc_name, "SLOT");82 if (dn) {83 *node_type = NODE_TYPE_SLOT;84 return dn;85 }86 87 dn = find_php_slot_pci_node(drc_name, "PHB");88 if (dn) {89 *node_type = NODE_TYPE_PHB;90 return dn;91 }92 93 dn = find_vio_slot_node(drc_name);94 if (dn) {95 *node_type = NODE_TYPE_VIO;96 return dn;97 }98 99 return NULL;100}101 102/**103 * find_php_slot - return hotplug slot structure for device node104 * @dn: target &device_node105 *106 * This routine will return the hotplug slot structure107 * for a given device node. Note that built-in PCI slots108 * may be dlpar-able, but not hot-pluggable, so this routine109 * will return NULL for built-in PCI slots.110 */111static struct slot *find_php_slot(struct device_node *dn)112{113 struct slot *slot, *next;114 115 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,116 rpaphp_slot_list) {117 if (slot->dn == dn)118 return slot;119 }120 121 return NULL;122}123 124static 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 138static 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 pseries_eeh_init_edev_recursive(pdn);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 %pOF\n",150 __func__, dn);151 return;152 }153 154 /* Scan below the new bridge */155 if (pci_is_bridge(dev))156 of_scan_pci_bridge(dev);157 158 /* Map IO space for child bus, which may or may not succeed */159 pcibios_map_io_space(dev->subordinate);160 161 /* Finish adding it : resource allocation, adding devices, etc...162 * Note that we need to perform the finish pass on the -parent-163 * bus of the EADS bridge so the bridge device itself gets164 * properly added165 */166 pcibios_finish_adding_to_bus(phb->bus);167}168 169static 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 (pci_find_bus_by_node(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", __func__,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 __func__, 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 __func__, drc_name);200 return -EIO;201 }202 return 0;203}204 205static int dlpar_remove_phb(char *drc_name, struct device_node *dn)206{207 struct slot *slot;208 struct pci_dn *pdn;209 int rc = 0;210 211 if (!pci_find_bus_by_node(dn))212 return -EINVAL;213 214 /* If pci slot is hotpluggable, use hotplug to remove it */215 slot = find_php_slot(dn);216 if (slot && rpaphp_deregister_slot(slot)) {217 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",218 __func__, drc_name);219 return -EIO;220 }221 222 pdn = dn->data;223 BUG_ON(!pdn || !pdn->phb);224 rc = remove_phb_dynamic(pdn->phb);225 if (rc < 0)226 return rc;227 228 pdn->phb = NULL;229 230 return 0;231}232 233static int dlpar_add_phb(char *drc_name, struct device_node *dn)234{235 struct pci_controller *phb;236 237 if (PCI_DN(dn) && PCI_DN(dn)->phb) {238 /* PHB already exists */239 return -EINVAL;240 }241 242 phb = init_phb_dynamic(dn);243 if (!phb)244 return -EIO;245 246 if (rpaphp_add_slot(dn)) {247 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",248 __func__, drc_name);249 return -EIO;250 }251 return 0;252}253 254static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)255{256 struct vio_dev *vio_dev;257 258 vio_dev = vio_find_node(dn);259 if (vio_dev) {260 put_device(&vio_dev->dev);261 return -EINVAL;262 }263 264 if (!vio_register_device_node(dn)) {265 printk(KERN_ERR266 "%s: failed to register vio node %s\n",267 __func__, drc_name);268 return -EIO;269 }270 return 0;271}272 273/**274 * dlpar_add_slot - DLPAR add an I/O Slot275 * @drc_name: drc-name of newly added slot276 *277 * Make the hotplug module and the kernel aware of a newly added I/O Slot.278 * Return Codes:279 * 0 Success280 * -ENODEV Not a valid drc_name281 * -EINVAL Slot already added282 * -ERESTARTSYS Signalled before obtaining lock283 * -EIO Internal PCI Error284 */285int dlpar_add_slot(char *drc_name)286{287 struct device_node *dn = NULL;288 int node_type;289 int rc = -EIO;290 291 if (mutex_lock_interruptible(&rpadlpar_mutex))292 return -ERESTARTSYS;293 294 /* Find newly added node */295 dn = find_dlpar_node(drc_name, &node_type);296 if (!dn) {297 rc = -ENODEV;298 goto exit;299 }300 301 switch (node_type) {302 case NODE_TYPE_VIO:303 rc = dlpar_add_vio_slot(drc_name, dn);304 break;305 case NODE_TYPE_SLOT:306 rc = dlpar_add_pci_slot(drc_name, dn);307 break;308 case NODE_TYPE_PHB:309 rc = dlpar_add_phb(drc_name, dn);310 break;311 }312 of_node_put(dn);313 314 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);315exit:316 mutex_unlock(&rpadlpar_mutex);317 return rc;318}319 320/**321 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot322 * @drc_name: drc-name of newly added slot323 * @dn: &device_node324 *325 * Remove the kernel and hotplug representations of an I/O Slot.326 * Return Codes:327 * 0 Success328 * -EINVAL Vio dev doesn't exist329 */330static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)331{332 struct vio_dev *vio_dev;333 334 vio_dev = vio_find_node(dn);335 if (!vio_dev)336 return -EINVAL;337 338 vio_unregister_device(vio_dev);339 340 put_device(&vio_dev->dev);341 342 return 0;343}344 345/**346 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot347 * @drc_name: drc-name of newly added slot348 * @dn: &device_node349 *350 * Remove the kernel and hotplug representations of a PCI I/O Slot.351 * Return Codes:352 * 0 Success353 * -ENODEV Not a valid drc_name354 * -EIO Internal PCI Error355 */356static int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)357{358 struct pci_bus *bus;359 struct slot *slot;360 int ret = 0;361 362 pci_lock_rescan_remove();363 364 bus = pci_find_bus_by_node(dn);365 if (!bus) {366 ret = -EINVAL;367 goto out;368 }369 370 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",371 bus->self ? pci_name(bus->self) : "<!PHB!>");372 373 slot = find_php_slot(dn);374 if (slot) {375 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",376 pci_domain_nr(bus), bus->number);377 378 if (rpaphp_deregister_slot(slot)) {379 printk(KERN_ERR380 "%s: unable to remove hotplug slot %s\n",381 __func__, drc_name);382 ret = -EIO;383 goto out;384 }385 }386 387 /* Remove all devices below slot */388 pci_hp_remove_devices(bus);389 390 /* Unmap PCI IO space */391 if (pcibios_unmap_io_space(bus)) {392 printk(KERN_ERR "%s: failed to unmap bus range\n",393 __func__);394 ret = -ERANGE;395 goto out;396 }397 398 /* Remove the EADS bridge device itself */399 BUG_ON(!bus->self);400 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));401 pci_stop_and_remove_bus_device(bus->self);402 403 out:404 pci_unlock_rescan_remove();405 return ret;406}407 408/**409 * dlpar_remove_slot - DLPAR remove an I/O Slot410 * @drc_name: drc-name of newly added slot411 *412 * Remove the kernel and hotplug representations of an I/O Slot.413 * Return Codes:414 * 0 Success415 * -ENODEV Not a valid drc_name416 * -EINVAL Slot already removed417 * -ERESTARTSYS Signalled before obtaining lock418 * -EIO Internal Error419 */420int dlpar_remove_slot(char *drc_name)421{422 struct device_node *dn;423 int node_type;424 int rc = 0;425 426 if (mutex_lock_interruptible(&rpadlpar_mutex))427 return -ERESTARTSYS;428 429 dn = find_dlpar_node(drc_name, &node_type);430 if (!dn) {431 rc = -ENODEV;432 goto exit;433 }434 435 switch (node_type) {436 case NODE_TYPE_VIO:437 rc = dlpar_remove_vio_slot(drc_name, dn);438 break;439 case NODE_TYPE_PHB:440 rc = dlpar_remove_phb(drc_name, dn);441 break;442 case NODE_TYPE_SLOT:443 rc = dlpar_remove_pci_slot(drc_name, dn);444 break;445 }446 of_node_put(dn);447 vm_unmap_aliases();448 449 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);450exit:451 mutex_unlock(&rpadlpar_mutex);452 return rc;453}454 455static inline int is_dlpar_capable(void)456{457 int rc = rtas_token("ibm,configure-connector");458 459 return (int) (rc != RTAS_UNKNOWN_SERVICE);460}461 462static int __init rpadlpar_io_init(void)463{464 465 if (!is_dlpar_capable()) {466 printk(KERN_WARNING "%s: partition not DLPAR capable\n",467 __func__);468 return -EPERM;469 }470 471 return dlpar_sysfs_init();472}473 474static void __exit rpadlpar_io_exit(void)475{476 dlpar_sysfs_exit();477}478 479module_init(rpadlpar_io_init);480module_exit(rpadlpar_io_exit);481MODULE_LICENSE("GPL");482MODULE_DESCRIPTION("RPA Dynamic Logical Partitioning driver for I/O slots");483