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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Interface for Dynamic Logical Partitioning of I/O Slots on
4 * RPA-compliant PPC64 platform.
5 *
6 * John Rose <johnrose@austin.ibm.com>
7 * Linda Xie <lxie@us.ibm.com>
8 *
9 * October 2003
10 *
11 * Copyright (C) 2003 IBM.
12 */
13
14#undef DEBUG
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/pci.h>
19#include <linux/string.h>
20#include <linux/vmalloc.h>
21
22#include <asm/pci-bridge.h>
23#include <linux/mutex.h>
24#include <asm/rtas.h>
25#include <asm/vio.h>
26#include <linux/firmware.h>
27
28#include "../pci.h"
29#include "rpaphp.h"
30#include "rpadlpar.h"
31
32static DEFINE_MUTEX(rpadlpar_mutex);
33
34#define DLPAR_MODULE_NAME "rpadlpar_io"
35
36#define NODE_TYPE_VIO 1
37#define NODE_TYPE_SLOT 2
38#define NODE_TYPE_PHB 3
39
40static struct device_node *find_vio_slot_node(char *drc_name)
41{
42 struct device_node *parent = of_find_node_by_name(NULL, "vdevice");
43 struct device_node *dn = NULL;
44 int rc;
45
46 if (!parent)
47 return NULL;
48
49 while ((dn = of_get_next_child(parent, dn))) {
50 rc = rpaphp_check_drc_props(dn, drc_name, NULL);
51 if (rc == 0)
52 break;
53 }
54 of_node_put(parent);
55
56 return dn;
57}
58
59/* Find dlpar-capable pci node that contains the specified name and type */
60static struct device_node *find_php_slot_pci_node(char *drc_name,
61 char *drc_type)
62{
63 struct device_node *np = NULL;
64 int rc;
65
66 while ((np = of_find_node_by_name(np, "pci"))) {
67 rc = rpaphp_check_drc_props(np, drc_name, drc_type);
68 if (rc == 0)
69 break;
70 }
71
72 return np;
73}
74
75/* Returns a device_node with its reference count incremented */
76static 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 */
110static struct slot *find_php_slot(struct device_node *dn)
111{
112 struct slot *slot, *next;
113
114 list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
115 rpaphp_slot_list) {
116 if (slot->dn == dn)
117 return slot;
118 }
119
120 return NULL;
121}
122
123static 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
137static 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(pdn);
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 %pOF\n",
149 __func__, dn);
150 return;
151 }
152
153 /* Scan below the new bridge */
154 if (pci_is_bridge(dev))
155 of_scan_pci_bridge(dev);
156
157 /* Map IO space for child bus, which may or may not succeed */
158 pcibios_map_io_space(dev->subordinate);
159
160 /* Finish adding it : resource allocation, adding devices, etc...
161 * Note that we need to perform the finish pass on the -parent-
162 * bus of the EADS bridge so the bridge device itself gets
163 * properly added
164 */
165 pcibios_finish_adding_to_bus(phb->bus);
166}
167
168static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
169{
170 struct pci_dev *dev;
171 struct pci_controller *phb;
172
173 if (pci_find_bus_by_node(dn))
174 return -EINVAL;
175
176 /* Add pci bus */
177 dlpar_pci_add_bus(dn);
178
179 /* Confirm new bridge dev was created */
180 phb = PCI_DN(dn)->phb;
181 dev = dlpar_find_new_dev(phb->bus, dn);
182
183 if (!dev) {
184 printk(KERN_ERR "%s: unable to add bus %s\n", __func__,
185 drc_name);
186 return -EIO;
187 }
188
189 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
190 printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n",
191 __func__, dev->hdr_type, drc_name);
192 return -EIO;
193 }
194
195 /* Add hotplug slot */
196 if (rpaphp_add_slot(dn)) {
197 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
198 __func__, drc_name);
199 return -EIO;
200 }
201 return 0;
202}
203
204static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
205{
206 struct slot *slot;
207 struct pci_dn *pdn;
208 int rc = 0;
209
210 if (!pci_find_bus_by_node(dn))
211 return -EINVAL;
212
213 /* If pci slot is hotpluggable, use hotplug to remove it */
214 slot = find_php_slot(dn);
215 if (slot && rpaphp_deregister_slot(slot)) {
216 printk(KERN_ERR "%s: unable to remove hotplug slot %s\n",
217 __func__, drc_name);
218 return -EIO;
219 }
220
221 pdn = dn->data;
222 BUG_ON(!pdn || !pdn->phb);
223 rc = remove_phb_dynamic(pdn->phb);
224 if (rc < 0)
225 return rc;
226
227 pdn->phb = NULL;
228
229 return 0;
230}
231
232static int dlpar_add_phb(char *drc_name, struct device_node *dn)
233{
234 struct pci_controller *phb;
235
236 if (PCI_DN(dn) && PCI_DN(dn)->phb) {
237 /* PHB already exists */
238 return -EINVAL;
239 }
240
241 phb = init_phb_dynamic(dn);
242 if (!phb)
243 return -EIO;
244
245 if (rpaphp_add_slot(dn)) {
246 printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
247 __func__, drc_name);
248 return -EIO;
249 }
250 return 0;
251}
252
253static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
254{
255 struct vio_dev *vio_dev;
256
257 vio_dev = vio_find_node(dn);
258 if (vio_dev) {
259 put_device(&vio_dev->dev);
260 return -EINVAL;
261 }
262
263 if (!vio_register_device_node(dn)) {
264 printk(KERN_ERR
265 "%s: failed to register vio node %s\n",
266 __func__, drc_name);
267 return -EIO;
268 }
269 return 0;
270}
271
272/**
273 * dlpar_add_slot - DLPAR add an I/O Slot
274 * @drc_name: drc-name of newly added slot
275 *
276 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
277 * Return Codes:
278 * 0 Success
279 * -ENODEV Not a valid drc_name
280 * -EINVAL Slot already added
281 * -ERESTARTSYS Signalled before obtaining lock
282 * -EIO Internal PCI Error
283 */
284int dlpar_add_slot(char *drc_name)
285{
286 struct device_node *dn = NULL;
287 int node_type;
288 int rc = -EIO;
289
290 if (mutex_lock_interruptible(&rpadlpar_mutex))
291 return -ERESTARTSYS;
292
293 /* Find newly added node */
294 dn = find_dlpar_node(drc_name, &node_type);
295 if (!dn) {
296 rc = -ENODEV;
297 goto exit;
298 }
299
300 switch (node_type) {
301 case NODE_TYPE_VIO:
302 rc = dlpar_add_vio_slot(drc_name, dn);
303 break;
304 case NODE_TYPE_SLOT:
305 rc = dlpar_add_pci_slot(drc_name, dn);
306 break;
307 case NODE_TYPE_PHB:
308 rc = dlpar_add_phb(drc_name, dn);
309 break;
310 }
311 of_node_put(dn);
312
313 printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
314exit:
315 mutex_unlock(&rpadlpar_mutex);
316 return rc;
317}
318
319/**
320 * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot
321 * @drc_name: drc-name of newly added slot
322 * @dn: &device_node
323 *
324 * Remove the kernel and hotplug representations of an I/O Slot.
325 * Return Codes:
326 * 0 Success
327 * -EINVAL Vio dev doesn't exist
328 */
329static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
330{
331 struct vio_dev *vio_dev;
332
333 vio_dev = vio_find_node(dn);
334 if (!vio_dev)
335 return -EINVAL;
336
337 vio_unregister_device(vio_dev);
338
339 put_device(&vio_dev->dev);
340
341 return 0;
342}
343
344/**
345 * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot
346 * @drc_name: drc-name of newly added slot
347 * @dn: &device_node
348 *
349 * Remove the kernel and hotplug representations of a PCI I/O Slot.
350 * Return Codes:
351 * 0 Success
352 * -ENODEV Not a valid drc_name
353 * -EIO Internal PCI Error
354 */
355int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
356{
357 struct pci_bus *bus;
358 struct slot *slot;
359 int ret = 0;
360
361 pci_lock_rescan_remove();
362
363 bus = pci_find_bus_by_node(dn);
364 if (!bus) {
365 ret = -EINVAL;
366 goto out;
367 }
368
369 pr_debug("PCI: Removing PCI slot below EADS bridge %s\n",
370 bus->self ? pci_name(bus->self) : "<!PHB!>");
371
372 slot = find_php_slot(dn);
373 if (slot) {
374 pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n",
375 pci_domain_nr(bus), bus->number);
376
377 if (rpaphp_deregister_slot(slot)) {
378 printk(KERN_ERR
379 "%s: unable to remove hotplug slot %s\n",
380 __func__, drc_name);
381 ret = -EIO;
382 goto out;
383 }
384 }
385
386 /* Remove all devices below slot */
387 pci_hp_remove_devices(bus);
388
389 /* Unmap PCI IO space */
390 if (pcibios_unmap_io_space(bus)) {
391 printk(KERN_ERR "%s: failed to unmap bus range\n",
392 __func__);
393 ret = -ERANGE;
394 goto out;
395 }
396
397 /* Remove the EADS bridge device itself */
398 BUG_ON(!bus->self);
399 pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self));
400 pci_stop_and_remove_bus_device(bus->self);
401
402 out:
403 pci_unlock_rescan_remove();
404 return ret;
405}
406
407/**
408 * dlpar_remove_slot - DLPAR remove an I/O Slot
409 * @drc_name: drc-name of newly added slot
410 *
411 * Remove the kernel and hotplug representations of an I/O Slot.
412 * Return Codes:
413 * 0 Success
414 * -ENODEV Not a valid drc_name
415 * -EINVAL Slot already removed
416 * -ERESTARTSYS Signalled before obtaining lock
417 * -EIO Internal Error
418 */
419int dlpar_remove_slot(char *drc_name)
420{
421 struct device_node *dn;
422 int node_type;
423 int rc = 0;
424
425 if (mutex_lock_interruptible(&rpadlpar_mutex))
426 return -ERESTARTSYS;
427
428 dn = find_dlpar_node(drc_name, &node_type);
429 if (!dn) {
430 rc = -ENODEV;
431 goto exit;
432 }
433
434 switch (node_type) {
435 case NODE_TYPE_VIO:
436 rc = dlpar_remove_vio_slot(drc_name, dn);
437 break;
438 case NODE_TYPE_PHB:
439 rc = dlpar_remove_phb(drc_name, dn);
440 break;
441 case NODE_TYPE_SLOT:
442 rc = dlpar_remove_pci_slot(drc_name, dn);
443 break;
444 }
445 of_node_put(dn);
446 vm_unmap_aliases();
447
448 printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
449exit:
450 mutex_unlock(&rpadlpar_mutex);
451 return rc;
452}
453
454static inline int is_dlpar_capable(void)
455{
456 int rc = rtas_token("ibm,configure-connector");
457
458 return (int) (rc != RTAS_UNKNOWN_SERVICE);
459}
460
461int __init rpadlpar_io_init(void)
462{
463
464 if (!is_dlpar_capable()) {
465 printk(KERN_WARNING "%s: partition not DLPAR capable\n",
466 __func__);
467 return -EPERM;
468 }
469
470 return dlpar_sysfs_init();
471}
472
473void rpadlpar_io_exit(void)
474{
475 dlpar_sysfs_exit();
476}
477
478module_init(rpadlpar_io_init);
479module_exit(rpadlpar_io_exit);
480MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Interface for Dynamic Logical Partitioning of I/O Slots on
4 * RPA-compliant PPC64 platform.
5 *
6 * John Rose <johnrose@austin.ibm.com>
7 * Linda Xie <lxie@us.ibm.com>
8 *
9 * October 2003
10 *
11 * Copyright (C) 2003 IBM.
12 */
13
14#undef DEBUG
15
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 1
38#define NODE_TYPE_SLOT 2
39#define NODE_TYPE_PHB 3
40
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 node
104 * @dn: target &device_node
105 *
106 * This routine will return the hotplug slot structure
107 * for a given device node. Note that built-in PCI slots
108 * may be dlpar-able, but not hot-pluggable, so this routine
109 * 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 gets
164 * properly added
165 */
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_ERR
266 "%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 Slot
275 * @drc_name: drc-name of newly added slot
276 *
277 * Make the hotplug module and the kernel aware of a newly added I/O Slot.
278 * Return Codes:
279 * 0 Success
280 * -ENODEV Not a valid drc_name
281 * -EINVAL Slot already added
282 * -ERESTARTSYS Signalled before obtaining lock
283 * -EIO Internal PCI Error
284 */
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 Slot
322 * @drc_name: drc-name of newly added slot
323 * @dn: &device_node
324 *
325 * Remove the kernel and hotplug representations of an I/O Slot.
326 * Return Codes:
327 * 0 Success
328 * -EINVAL Vio dev doesn't exist
329 */
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 Slot
347 * @drc_name: drc-name of newly added slot
348 * @dn: &device_node
349 *
350 * Remove the kernel and hotplug representations of a PCI I/O Slot.
351 * Return Codes:
352 * 0 Success
353 * -ENODEV Not a valid drc_name
354 * -EIO Internal PCI Error
355 */
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_ERR
380 "%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 Slot
410 * @drc_name: drc-name of newly added slot
411 *
412 * Remove the kernel and hotplug representations of an I/O Slot.
413 * Return Codes:
414 * 0 Success
415 * -ENODEV Not a valid drc_name
416 * -EINVAL Slot already removed
417 * -ERESTARTSYS Signalled before obtaining lock
418 * -EIO Internal Error
419 */
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");