Commit | Line | Data |
---|---|---|
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 | 20 | #include <linux/init.h> |
eefa9cfc | 21 | #include <linux/module.h> |
1da177e4 | 22 | #include <linux/pci.h> |
4e57b681 | 23 | #include <linux/string.h> |
b4a26be9 | 24 | #include <linux/vmalloc.h> |
4e57b681 | 25 | |
1da177e4 | 26 | #include <asm/pci-bridge.h> |
14cc3e2b | 27 | #include <linux/mutex.h> |
1da177e4 | 28 | #include <asm/rtas.h> |
5eeb8c63 | 29 | #include <asm/vio.h> |
4e57b681 | 30 | |
1da177e4 LT |
31 | #include "../pci.h" |
32 | #include "rpaphp.h" | |
33 | #include "rpadlpar.h" | |
34 | ||
14cc3e2b | 35 | static DEFINE_MUTEX(rpadlpar_mutex); |
1da177e4 | 36 | |
56d8456b JR |
37 | #define DLPAR_MODULE_NAME "rpadlpar_io" |
38 | ||
1da177e4 LT |
39 | #define NODE_TYPE_VIO 1 |
40 | #define NODE_TYPE_SLOT 2 | |
41 | #define NODE_TYPE_PHB 3 | |
42 | ||
5eeb8c63 | 43 | static struct device_node *find_vio_slot_node(char *drc_name) |
1da177e4 | 44 | { |
1da177e4 | 45 | struct device_node *parent = of_find_node_by_name(NULL, "vdevice"); |
5eeb8c63 JR |
46 | struct device_node *dn = NULL; |
47 | char *name; | |
48 | int rc; | |
1da177e4 LT |
49 | |
50 | if (!parent) | |
51 | return NULL; | |
52 | ||
5eeb8c63 JR |
53 | while ((dn = of_get_next_child(parent, dn))) { |
54 | rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL); | |
55 | if ((rc == 0) && (!strcmp(drc_name, name))) | |
56 | break; | |
1da177e4 LT |
57 | } |
58 | ||
5eeb8c63 | 59 | return dn; |
1da177e4 LT |
60 | } |
61 | ||
62 | /* Find dlpar-capable pci node that contains the specified name and type */ | |
63 | static struct device_node *find_php_slot_pci_node(char *drc_name, | |
64 | char *drc_type) | |
65 | { | |
66 | struct device_node *np = NULL; | |
67 | char *name; | |
68 | char *type; | |
69 | int rc; | |
70 | ||
a57ed79e | 71 | while ((np = of_find_node_by_name(np, "pci"))) { |
1da177e4 LT |
72 | rc = rpaphp_get_drc_props(np, NULL, &name, &type, NULL); |
73 | if (rc == 0) | |
74 | if (!strcmp(drc_name, name) && !strcmp(drc_type, type)) | |
75 | break; | |
76 | } | |
77 | ||
78 | return np; | |
79 | } | |
80 | ||
5eeb8c63 | 81 | static struct device_node *find_dlpar_node(char *drc_name, int *node_type) |
1da177e4 LT |
82 | { |
83 | struct device_node *dn; | |
84 | ||
85 | dn = find_php_slot_pci_node(drc_name, "SLOT"); | |
86 | if (dn) { | |
87 | *node_type = NODE_TYPE_SLOT; | |
88 | return dn; | |
89 | } | |
90 | ||
91 | dn = find_php_slot_pci_node(drc_name, "PHB"); | |
92 | if (dn) { | |
93 | *node_type = NODE_TYPE_PHB; | |
94 | return dn; | |
95 | } | |
96 | ||
5eeb8c63 | 97 | dn = find_vio_slot_node(drc_name); |
1da177e4 LT |
98 | if (dn) { |
99 | *node_type = NODE_TYPE_VIO; | |
100 | return dn; | |
101 | } | |
102 | ||
103 | return NULL; | |
104 | } | |
105 | ||
8485d1a1 LV |
106 | /** |
107 | * find_php_slot - return hotplug slot structure for device node | |
26e6c66e | 108 | * @dn: target &device_node |
8485d1a1 LV |
109 | * |
110 | * This routine will return the hotplug slot structure | |
111 | * for a given device node. Note that built-in PCI slots | |
112 | * may be dlpar-able, but not hot-pluggable, so this routine | |
113 | * will return NULL for built-in PCI slots. | |
114 | */ | |
115 | static struct slot *find_php_slot(struct device_node *dn) | |
1da177e4 | 116 | { |
2ac83ccc | 117 | struct slot *slot, *next; |
1da177e4 | 118 | |
2ac83ccc GT |
119 | list_for_each_entry_safe(slot, next, &rpaphp_slot_head, |
120 | rpaphp_slot_list) { | |
8737d6a9 | 121 | if (slot->dn == dn) |
122 | return slot; | |
123 | } | |
1da177e4 | 124 | |
8737d6a9 | 125 | return NULL; |
1da177e4 LT |
126 | } |
127 | ||
0945cd5f JR |
128 | static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent, |
129 | struct device_node *dev_dn) | |
130 | { | |
131 | struct pci_dev *tmp = NULL; | |
132 | struct device_node *child_dn; | |
133 | ||
134 | list_for_each_entry(tmp, &parent->devices, bus_list) { | |
135 | child_dn = pci_device_to_OF_node(tmp); | |
136 | if (child_dn == dev_dn) | |
137 | return tmp; | |
138 | } | |
139 | return NULL; | |
140 | } | |
141 | ||
8737d6a9 | 142 | static void dlpar_pci_add_bus(struct device_node *dn) |
1da177e4 | 143 | { |
8737d6a9 | 144 | struct pci_dn *pdn = PCI_DN(dn); |
5fa80fcd | 145 | struct pci_controller *phb = pdn->phb; |
1da177e4 LT |
146 | struct pci_dev *dev = NULL; |
147 | ||
ff57b454 | 148 | eeh_add_device_tree_early(pdn); |
d681db4a | 149 | |
5fa80fcd JR |
150 | /* Add EADS device to PHB bus, adding new entry to bus->devices */ |
151 | dev = of_create_pci_dev(dn, phb->bus, pdn->devfn); | |
152 | if (!dev) { | |
153 | printk(KERN_ERR "%s: failed to create pci dev for %s\n", | |
66bef8c0 | 154 | __func__, dn->full_name); |
8737d6a9 | 155 | return; |
1da177e4 LT |
156 | } |
157 | ||
fd6852c8 | 158 | /* Scan below the new bridge */ |
f86e1f15 | 159 | if (pci_is_bridge(dev)) |
98d9f30c | 160 | of_scan_pci_bridge(dev); |
5fa80fcd | 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 | 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 | 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 | 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 | |
f7625980 | 218 | /* If pci slot is hotpluggable, use hotplug to remove it */ |
8485d1a1 | 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; | |
c4ec84c7 RW |
355 | int ret = 0; |
356 | ||
357 | pci_lock_rescan_remove(); | |
1da177e4 | 358 | |
01657868 | 359 | bus = pcibios_find_pci_bus(dn); |
c4ec84c7 RW |
360 | if (!bus) { |
361 | ret = -EINVAL; | |
362 | goto out; | |
363 | } | |
56d8456b | 364 | |
fd6852c8 BH |
365 | pr_debug("PCI: Removing PCI slot below EADS bridge %s\n", |
366 | bus->self ? pci_name(bus->self) : "<!PHB!>"); | |
367 | ||
8485d1a1 | 368 | slot = find_php_slot(dn); |
56d8456b | 369 | if (slot) { |
fd6852c8 BH |
370 | pr_debug("PCI: Removing hotplug slot for %04x:%02x...\n", |
371 | pci_domain_nr(bus), bus->number); | |
372 | ||
f6afbad8 | 373 | if (rpaphp_deregister_slot(slot)) { |
56d8456b JR |
374 | printk(KERN_ERR |
375 | "%s: unable to remove hotplug slot %s\n", | |
66bef8c0 | 376 | __func__, drc_name); |
c4ec84c7 RW |
377 | ret = -EIO; |
378 | goto out; | |
56d8456b | 379 | } |
fd6852c8 BH |
380 | } |
381 | ||
382 | /* Remove all devices below slot */ | |
383 | pcibios_remove_pci_devices(bus); | |
1da177e4 | 384 | |
fd6852c8 | 385 | /* Unmap PCI IO space */ |
3d5134ee | 386 | if (pcibios_unmap_io_space(bus)) { |
9c209c91 | 387 | printk(KERN_ERR "%s: failed to unmap bus range\n", |
66bef8c0 | 388 | __func__); |
c4ec84c7 RW |
389 | ret = -ERANGE; |
390 | goto out; | |
1da177e4 | 391 | } |
9c209c91 | 392 | |
fd6852c8 | 393 | /* Remove the EADS bridge device itself */ |
9c209c91 | 394 | BUG_ON(!bus->self); |
fd6852c8 | 395 | pr_debug("PCI: Now removing bridge device %s\n", pci_name(bus->self)); |
210647af | 396 | pci_stop_and_remove_bus_device(bus->self); |
fd6852c8 | 397 | |
c4ec84c7 RW |
398 | out: |
399 | pci_unlock_rescan_remove(); | |
400 | return ret; | |
1da177e4 LT |
401 | } |
402 | ||
403 | /** | |
404 | * dlpar_remove_slot - DLPAR remove an I/O Slot | |
405 | * @drc_name: drc-name of newly added slot | |
406 | * | |
26e6c66e | 407 | * Remove the kernel and hotplug representations of an I/O Slot. |
1da177e4 LT |
408 | * Return Codes: |
409 | * 0 Success | |
410 | * -ENODEV Not a valid drc_name | |
411 | * -EINVAL Slot already removed | |
412 | * -ERESTARTSYS Signalled before obtaining lock | |
413 | * -EIO Internal Error | |
414 | */ | |
415 | int dlpar_remove_slot(char *drc_name) | |
416 | { | |
5eeb8c63 | 417 | struct device_node *dn; |
5eeb8c63 | 418 | int node_type; |
1da177e4 LT |
419 | int rc = 0; |
420 | ||
14cc3e2b | 421 | if (mutex_lock_interruptible(&rpadlpar_mutex)) |
1da177e4 LT |
422 | return -ERESTARTSYS; |
423 | ||
5eeb8c63 JR |
424 | dn = find_dlpar_node(drc_name, &node_type); |
425 | if (!dn) { | |
1da177e4 LT |
426 | rc = -ENODEV; |
427 | goto exit; | |
428 | } | |
429 | ||
56d8456b JR |
430 | switch (node_type) { |
431 | case NODE_TYPE_VIO: | |
432 | rc = dlpar_remove_vio_slot(drc_name, dn); | |
433 | break; | |
434 | case NODE_TYPE_PHB: | |
435 | rc = dlpar_remove_phb(drc_name, dn); | |
436 | break; | |
437 | case NODE_TYPE_SLOT: | |
438 | rc = dlpar_remove_pci_slot(drc_name, dn); | |
439 | break; | |
1da177e4 | 440 | } |
b4a26be9 BH |
441 | vm_unmap_aliases(); |
442 | ||
56d8456b | 443 | printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); |
1da177e4 | 444 | exit: |
14cc3e2b | 445 | mutex_unlock(&rpadlpar_mutex); |
1da177e4 LT |
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", | |
66bef8c0 | 462 | __func__); |
1da177e4 LT |
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"); |