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Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
fd6852c8 BH |
17 | |
18 | #undef DEBUG | |
19 | ||
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/pci.h> | |
4e57b681 TS |
22 | #include <linux/string.h> |
23 | ||
1da177e4 | 24 | #include <asm/pci-bridge.h> |
14cc3e2b | 25 | #include <linux/mutex.h> |
1da177e4 | 26 | #include <asm/rtas.h> |
5eeb8c63 | 27 | #include <asm/vio.h> |
4e57b681 | 28 | |
1da177e4 LT |
29 | #include "../pci.h" |
30 | #include "rpaphp.h" | |
31 | #include "rpadlpar.h" | |
32 | ||
14cc3e2b | 33 | static DEFINE_MUTEX(rpadlpar_mutex); |
1da177e4 | 34 | |
56d8456b JR |
35 | #define DLPAR_MODULE_NAME "rpadlpar_io" |
36 | ||
1da177e4 LT |
37 | #define NODE_TYPE_VIO 1 |
38 | #define NODE_TYPE_SLOT 2 | |
39 | #define NODE_TYPE_PHB 3 | |
40 | ||
5eeb8c63 | 41 | static struct device_node *find_vio_slot_node(char *drc_name) |
1da177e4 | 42 | { |
1da177e4 | 43 | struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); |
5eeb8c63 JR |
44 | struct device_node *dn = NULL; |
45 | char *name; | |
46 | int rc; | |
1da177e4 LT |
47 | |
48 | if (!parent) | |
49 | return NULL; | |
50 | ||
5eeb8c63 JR |
51 | while ((dn = of_get_next_child(parent, dn))) { |
52 | rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); | |
53 | if ((rc == 0) && (!strcmp(drc_name, name))) | |
54 | break; | |
1da177e4 LT |
55 | } |
56 | ||
5eeb8c63 | 57 | return dn; |
1da177e4 LT |
58 | } |
59 | ||
60 | /* Find dlpar-capable pci node that contains the specified name and type */ | |
61 | static struct device_node *find_php_slot_pci_node(char *drc_name, | |
62 | char *drc_type) | |
63 | { | |
64 | struct device_node *np = NULL; | |
65 | char *name; | |
66 | char *type; | |
67 | int rc; | |
68 | ||
a57ed79e | 69 | while ((np = of_find_node_by_name(np, "pci"))) { |
1da177e4 LT |
70 | rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); |
71 | if (rc == 0) | |
72 | if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) | |
73 | break; | |
74 | } | |
75 | ||
76 | return np; | |
77 | } | |
78 | ||
5eeb8c63 | 79 | static struct device_node *find_dlpar_node(char *drc_name, int *node_type) |
1da177e4 LT |
80 | { |
81 | struct device_node *dn; | |
82 | ||
83 | dn = find_php_slot_pci_node(drc_name, "SLOT"); | |
84 | if (dn) { | |
85 | *node_type = NODE_TYPE_SLOT; | |
86 | return dn; | |
87 | } | |
88 | ||
89 | dn = find_php_slot_pci_node(drc_name, "PHB"); | |
90 | if (dn) { | |
91 | *node_type = NODE_TYPE_PHB; | |
92 | return dn; | |
93 | } | |
94 | ||
5eeb8c63 | 95 | dn = find_vio_slot_node(drc_name); |
1da177e4 LT |
96 | if (dn) { |
97 | *node_type = NODE_TYPE_VIO; | |
98 | return dn; | |
99 | } | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | ||
8485d1a1 LV |
104 | /** |
105 | * find_php_slot - return hotplug slot structure for device node | |
26e6c66e | 106 | * @dn: target &device_node |
8485d1a1 LV |
107 | * |
108 | * This routine will return the hotplug slot structure | |
109 | * for a given device node. Note that built-in PCI slots | |
110 | * may be dlpar-able, but not hot-pluggable, so this routine | |
111 | * will return NULL for built-in PCI slots. | |
112 | */ | |
113 | static struct slot *find_php_slot(struct device_node *dn) | |
1da177e4 LT |
114 | { |
115 | struct list_head *tmp, *n; | |
116 | struct slot *slot; | |
117 | ||
8737d6a9 LV |
118 | list_for_each_safe(tmp, n, &rpaphp_slot_head) { |
119 | slot = list_entry(tmp, struct slot, rpaphp_slot_list); | |
120 | if (slot->dn == dn) | |
121 | return slot; | |
122 | } | |
1da177e4 | 123 | |
8737d6a9 | 124 | return NULL; |
1da177e4 LT |
125 | } |
126 | ||
0945cd5f JR |
127 | static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, |
128 | struct device_node *dev_dn) | |
129 | { | |
130 | struct pci_dev *tmp = NULL; | |
131 | struct device_node *child_dn; | |
132 | ||
133 | list_for_each_entry(tmp, &parent->devices, bus_list) { | |
134 | child_dn = pci_device_to_OF_node(tmp); | |
135 | if (child_dn == dev_dn) | |
136 | return tmp; | |
137 | } | |
138 | return NULL; | |
139 | } | |
140 | ||
8737d6a9 | 141 | static void dlpar_pci_add_bus(struct device_node *dn) |
1da177e4 | 142 | { |
8737d6a9 | 143 | struct pci_dn *pdn = PCI_DN(dn); |
5fa80fcd | 144 | struct pci_controller *phb = pdn->phb; |
1da177e4 LT |
145 | struct pci_dev *dev = NULL; |
146 | ||
d681db4a LV |
147 | eeh_add_device_tree_early(dn); |
148 | ||
5fa80fcd JR |
149 | /* Add EADS device to PHB bus, adding new entry to bus->devices */ |
150 | dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); | |
151 | if (!dev) { | |
152 | printk(KERN_ERR "%s: failed to create pci dev for %s\n", | |
66bef8c0 | 153 | __func__, dn->full_name); |
8737d6a9 | 154 | return; |
1da177e4 LT |
155 | } |
156 | ||
fd6852c8 | 157 | /* Scan below the new bridge */ |
5fa80fcd JR |
158 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
159 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
160 | of_scan_pci_bridge(dn, dev); | |
161 | ||
3d5134ee BH |
162 | /* Map IO space for child bus, which may or may not succeed */ |
163 | pcibios_map_io_space(dev->subordinate); | |
5fa80fcd | 164 | |
fd6852c8 BH |
165 | /* Finish adding it : resource allocation, adding devices, etc... |
166 | * Note that we need to perform the finish pass on the -parent- | |
167 | * bus of the EADS bridge so the bridge device itself gets | |
168 | * properly added | |
169 | */ | |
170 | pcibios_finish_adding_to_bus(phb->bus); | |
1da177e4 LT |
171 | } |
172 | ||
940903c5 | 173 | static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn) |
1da177e4 LT |
174 | { |
175 | struct pci_dev *dev; | |
8737d6a9 | 176 | struct pci_controller *phb; |
1da177e4 | 177 | |
01657868 | 178 | if (pcibios_find_pci_bus(dn)) |
56d8456b JR |
179 | return -EINVAL; |
180 | ||
1da177e4 | 181 | /* Add pci bus */ |
8737d6a9 LV |
182 | dlpar_pci_add_bus(dn); |
183 | ||
184 | /* Confirm new bridge dev was created */ | |
185 | phb = PCI_DN(dn)->phb; | |
186 | dev = dlpar_find_new_dev(phb->bus, dn); | |
187 | ||
1da177e4 | 188 | if (!dev) { |
66bef8c0 | 189 | printk(KERN_ERR "%s: unable to add bus %s\n", __func__, |
1da177e4 LT |
190 | drc_name); |
191 | return -EIO; | |
192 | } | |
193 | ||
8737d6a9 LV |
194 | if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { |
195 | printk(KERN_ERR "%s: unexpected header type %d, unable to add bus %s\n", | |
66bef8c0 | 196 | __func__, dev->hdr_type, drc_name); |
8737d6a9 LV |
197 | return -EIO; |
198 | } | |
199 | ||
5eeb8c63 JR |
200 | /* Add hotplug slot */ |
201 | if (rpaphp_add_slot(dn)) { | |
202 | printk(KERN_ERR "%s: unable to add hotplug slot %s\n", | |
66bef8c0 | 203 | __func__, drc_name); |
5eeb8c63 JR |
204 | return -EIO; |
205 | } | |
1da177e4 LT |
206 | return 0; |
207 | } | |
208 | ||
56d8456b | 209 | static int dlpar_remove_phb(char *drc_name, struct device_node *dn) |
1da177e4 | 210 | { |
56d8456b | 211 | struct slot *slot; |
1635317f | 212 | struct pci_dn *pdn; |
1da177e4 LT |
213 | int rc = 0; |
214 | ||
01657868 | 215 | if (!pcibios_find_pci_bus(dn)) |
56d8456b | 216 | return -EINVAL; |
1da177e4 | 217 | |
8485d1a1 LV |
218 | /* If pci slot is hotplugable, use hotplug to remove it */ |
219 | slot = find_php_slot(dn); | |
fd6852c8 BH |
220 | if (slot && rpaphp_deregister_slot(slot)) { |
221 | printk(KERN_ERR "%s: unable to remove hotplug slot %s\n", | |
222 | __func__, drc_name); | |
223 | return -EIO; | |
1da177e4 LT |
224 | } |
225 | ||
1635317f PM |
226 | pdn = dn->data; |
227 | BUG_ON(!pdn || !pdn->phb); | |
fd6852c8 | 228 | rc = remove_phb_dynamic(pdn->phb); |
1da177e4 LT |
229 | if (rc < 0) |
230 | return rc; | |
231 | ||
1635317f | 232 | pdn->phb = NULL; |
56d8456b | 233 | |
1da177e4 LT |
234 | return 0; |
235 | } | |
236 | ||
5eeb8c63 | 237 | static int dlpar_add_phb(char *drc_name, struct device_node *dn) |
1da177e4 LT |
238 | { |
239 | struct pci_controller *phb; | |
240 | ||
fe98aeab | 241 | if (PCI_DN(dn) && PCI_DN(dn)->phb) { |
56d8456b JR |
242 | /* PHB already exists */ |
243 | return -EINVAL; | |
244 | } | |
245 | ||
1da177e4 LT |
246 | phb = init_phb_dynamic(dn); |
247 | if (!phb) | |
56d8456b | 248 | return -EIO; |
1da177e4 | 249 | |
5eeb8c63 JR |
250 | if (rpaphp_add_slot(dn)) { |
251 | printk(KERN_ERR "%s: unable to add hotplug slot %s\n", | |
66bef8c0 | 252 | __func__, drc_name); |
5eeb8c63 JR |
253 | return -EIO; |
254 | } | |
1da177e4 LT |
255 | return 0; |
256 | } | |
257 | ||
56d8456b JR |
258 | static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn) |
259 | { | |
260 | if (vio_find_node(dn)) | |
261 | return -EINVAL; | |
262 | ||
263 | if (!vio_register_device_node(dn)) { | |
264 | printk(KERN_ERR | |
265 | "%s: failed to register vio node %s\n", | |
66bef8c0 | 266 | __func__, drc_name); |
56d8456b JR |
267 | return -EIO; |
268 | } | |
269 | return 0; | |
270 | } | |
271 | ||
1da177e4 LT |
272 | /** |
273 | * dlpar_add_slot - DLPAR add an I/O Slot | |
274 | * @drc_name: drc-name of newly added slot | |
275 | * | |
26e6c66e RD |
276 | * Make the hotplug module and the kernel aware of a newly added I/O Slot. |
277 | * Return Codes: | |
1da177e4 LT |
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 | */ | |
284 | int dlpar_add_slot(char *drc_name) | |
285 | { | |
286 | struct device_node *dn = NULL; | |
287 | int node_type; | |
56d8456b | 288 | int rc = -EIO; |
1da177e4 | 289 | |
14cc3e2b | 290 | if (mutex_lock_interruptible(&rpadlpar_mutex)) |
1da177e4 LT |
291 | return -ERESTARTSYS; |
292 | ||
5eeb8c63 JR |
293 | /* Find newly added node */ |
294 | dn = find_dlpar_node(drc_name, &node_type); | |
1da177e4 LT |
295 | if (!dn) { |
296 | rc = -ENODEV; | |
297 | goto exit; | |
298 | } | |
299 | ||
300 | switch (node_type) { | |
301 | case NODE_TYPE_VIO: | |
56d8456b | 302 | rc = dlpar_add_vio_slot(drc_name, dn); |
1da177e4 LT |
303 | break; |
304 | case NODE_TYPE_SLOT: | |
305 | rc = dlpar_add_pci_slot(drc_name, dn); | |
306 | break; | |
307 | case NODE_TYPE_PHB: | |
5eeb8c63 | 308 | rc = dlpar_add_phb(drc_name, dn); |
1da177e4 | 309 | break; |
1da177e4 LT |
310 | } |
311 | ||
56d8456b | 312 | printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); |
1da177e4 | 313 | exit: |
14cc3e2b | 314 | mutex_unlock(&rpadlpar_mutex); |
1da177e4 LT |
315 | return rc; |
316 | } | |
317 | ||
318 | /** | |
319 | * dlpar_remove_vio_slot - DLPAR remove a virtual I/O Slot | |
320 | * @drc_name: drc-name of newly added slot | |
26e6c66e | 321 | * @dn: &device_node |
1da177e4 | 322 | * |
26e6c66e | 323 | * Remove the kernel and hotplug representations of an I/O Slot. |
1da177e4 LT |
324 | * Return Codes: |
325 | * 0 Success | |
56d8456b | 326 | * -EINVAL Vio dev doesn't exist |
1da177e4 | 327 | */ |
56d8456b | 328 | static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn) |
1da177e4 | 329 | { |
5eeb8c63 | 330 | struct vio_dev *vio_dev; |
1da177e4 | 331 | |
5eeb8c63 | 332 | vio_dev = vio_find_node(dn); |
56d8456b JR |
333 | if (!vio_dev) |
334 | return -EINVAL; | |
5eeb8c63 JR |
335 | |
336 | vio_unregister_device(vio_dev); | |
1da177e4 LT |
337 | return 0; |
338 | } | |
339 | ||
340 | /** | |
26e6c66e | 341 | * dlpar_remove_pci_slot - DLPAR remove a PCI I/O Slot |
1da177e4 | 342 | * @drc_name: drc-name of newly added slot |
26e6c66e | 343 | * @dn: &device_node |
1da177e4 | 344 | * |
26e6c66e | 345 | * Remove the kernel and hotplug representations of a PCI I/O Slot. |
1da177e4 LT |
346 | * Return Codes: |
347 | * 0 Success | |
348 | * -ENODEV Not a valid drc_name | |
349 | * -EIO Internal PCI Error | |
350 | */ | |
56d8456b | 351 | int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn) |
1da177e4 | 352 | { |
56d8456b JR |
353 | struct pci_bus *bus; |
354 | struct slot *slot; | |
1da177e4 | 355 | |
01657868 | 356 | bus = pcibios_find_pci_bus(dn); |
56d8456b JR |
357 | if (!bus) |
358 | return -EINVAL; | |
359 | ||
fd6852c8 BH |
360 | pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", |
361 | bus->self ? pci_name(bus->self) : "<!PHB!>"); | |
362 | ||
8485d1a1 | 363 | slot = find_php_slot(dn); |
56d8456b | 364 | if (slot) { |
fd6852c8 BH |
365 | pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", |
366 | pci_domain_nr(bus), bus->number); | |
367 | ||
f6afbad8 | 368 | if (rpaphp_deregister_slot(slot)) { |
56d8456b JR |
369 | printk(KERN_ERR |
370 | "%s: unable to remove hotplug slot %s\n", | |
66bef8c0 | 371 | __func__, drc_name); |
56d8456b JR |
372 | return -EIO; |
373 | } | |
fd6852c8 BH |
374 | } |
375 | ||
376 | /* Remove all devices below slot */ | |
377 | pcibios_remove_pci_devices(bus); | |
1da177e4 | 378 | |
fd6852c8 | 379 | /* Unmap PCI IO space */ |
3d5134ee | 380 | if (pcibios_unmap_io_space(bus)) { |
9c209c91 | 381 | printk(KERN_ERR "%s: failed to unmap bus range\n", |
66bef8c0 | 382 | __func__); |
9c209c91 | 383 | return -ERANGE; |
1da177e4 | 384 | } |
9c209c91 | 385 | |
fd6852c8 | 386 | /* Remove the EADS bridge device itself */ |
9c209c91 | 387 | BUG_ON(!bus->self); |
fd6852c8 BH |
388 | pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); |
389 | eeh_remove_bus_device(bus->self); | |
9c209c91 | 390 | pci_remove_bus_device(bus->self); |
fd6852c8 | 391 | |
1da177e4 LT |
392 | return 0; |
393 | } | |
394 | ||
395 | /** | |
396 | * dlpar_remove_slot - DLPAR remove an I/O Slot | |
397 | * @drc_name: drc-name of newly added slot | |
398 | * | |
26e6c66e | 399 | * Remove the kernel and hotplug representations of an I/O Slot. |
1da177e4 LT |
400 | * Return Codes: |
401 | * 0 Success | |
402 | * -ENODEV Not a valid drc_name | |
403 | * -EINVAL Slot already removed | |
404 | * -ERESTARTSYS Signalled before obtaining lock | |
405 | * -EIO Internal Error | |
406 | */ | |
407 | int dlpar_remove_slot(char *drc_name) | |
408 | { | |
5eeb8c63 | 409 | struct device_node *dn; |
5eeb8c63 | 410 | int node_type; |
1da177e4 LT |
411 | int rc = 0; |
412 | ||
14cc3e2b | 413 | if (mutex_lock_interruptible(&rpadlpar_mutex)) |
1da177e4 LT |
414 | return -ERESTARTSYS; |
415 | ||
5eeb8c63 JR |
416 | dn = find_dlpar_node(drc_name, &node_type); |
417 | if (!dn) { | |
1da177e4 LT |
418 | rc = -ENODEV; |
419 | goto exit; | |
420 | } | |
421 | ||
56d8456b JR |
422 | switch (node_type) { |
423 | case NODE_TYPE_VIO: | |
424 | rc = dlpar_remove_vio_slot(drc_name, dn); | |
425 | break; | |
426 | case NODE_TYPE_PHB: | |
427 | rc = dlpar_remove_phb(drc_name, dn); | |
428 | break; | |
429 | case NODE_TYPE_SLOT: | |
430 | rc = dlpar_remove_pci_slot(drc_name, dn); | |
431 | break; | |
1da177e4 | 432 | } |
56d8456b | 433 | printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); |
1da177e4 | 434 | exit: |
14cc3e2b | 435 | mutex_unlock(&rpadlpar_mutex); |
1da177e4 LT |
436 | return rc; |
437 | } | |
438 | ||
439 | static inline int is_dlpar_capable(void) | |
440 | { | |
441 | int rc = rtas_token("ibm,configure-connector"); | |
442 | ||
443 | return (int) (rc != RTAS_UNKNOWN_SERVICE); | |
444 | } | |
445 | ||
446 | int __init rpadlpar_io_init(void) | |
447 | { | |
448 | int rc = 0; | |
449 | ||
450 | if (!is_dlpar_capable()) { | |
451 | printk(KERN_WARNING "%s: partition not DLPAR capable\n", | |
66bef8c0 | 452 | __func__); |
1da177e4 LT |
453 | return -EPERM; |
454 | } | |
455 | ||
456 | rc = dlpar_sysfs_init(); | |
457 | return rc; | |
458 | } | |
459 | ||
460 | void rpadlpar_io_exit(void) | |
461 | { | |
462 | dlpar_sysfs_exit(); | |
463 | return; | |
464 | } | |
465 | ||
466 | module_init(rpadlpar_io_init); | |
467 | module_exit(rpadlpar_io_exit); | |
468 | MODULE_LICENSE("GPL"); |