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 | |
33 | static 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 | |
41 | static struct device_node *find_vio_slot_node(char *drc_name) |
42 | { |
43 | struct device_node *parent = of_find_node_by_name(NULL, name: "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(node: parent); |
56 | |
57 | return dn; |
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; |
65 | int rc; |
66 | |
67 | for_each_node_by_name(np, "pci" ) { |
68 | rc = rpaphp_check_drc_props(dn: 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 */ |
77 | static 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, drc_type: "SLOT" ); |
82 | if (dn) { |
83 | *node_type = NODE_TYPE_SLOT; |
84 | return dn; |
85 | } |
86 | |
87 | dn = find_php_slot_pci_node(drc_name, drc_type: "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 | */ |
111 | static 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 | |
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(pdev: 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 | 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 | |
169 | static 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(parent: phb->bus, dev_dn: 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 | |
205 | static 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 | |
233 | static 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 | |
254 | static 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(dev: &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 | */ |
285 | int 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: &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(node: dn); |
313 | |
314 | printk(KERN_INFO "%s: slot %s added\n" , DLPAR_MODULE_NAME, drc_name); |
315 | exit: |
316 | mutex_unlock(lock: &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 | */ |
330 | static 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(dev: &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 | */ |
356 | static 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(dev: 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 | */ |
420 | int 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: &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(node: dn); |
447 | vm_unmap_aliases(); |
448 | |
449 | printk(KERN_INFO "%s: slot %s removed\n" , DLPAR_MODULE_NAME, drc_name); |
450 | exit: |
451 | mutex_unlock(lock: &rpadlpar_mutex); |
452 | return rc; |
453 | } |
454 | |
455 | static 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 | |
462 | static 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 | |
474 | static void __exit rpadlpar_io_exit(void) |
475 | { |
476 | dlpar_sysfs_exit(); |
477 | } |
478 | |
479 | module_init(rpadlpar_io_init); |
480 | module_exit(rpadlpar_io_exit); |
481 | MODULE_LICENSE("GPL" ); |
482 | MODULE_DESCRIPTION("RPA Dynamic Logical Partitioning driver for I/O slots" ); |
483 | |