powerpc/mm/radix: Update LPCR only if it is powernv
[deliverable/linux.git] / arch / powerpc / kernel / pci_dn.c
1 /*
2 * pci_dn.c
3 *
4 * Copyright (C) 2001 Todd Inglett, IBM Corporation
5 *
6 * PCI manipulation via device_nodes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/kernel.h>
23 #include <linux/pci.h>
24 #include <linux/string.h>
25 #include <linux/export.h>
26 #include <linux/init.h>
27 #include <linux/gfp.h>
28
29 #include <asm/io.h>
30 #include <asm/prom.h>
31 #include <asm/pci-bridge.h>
32 #include <asm/ppc-pci.h>
33 #include <asm/firmware.h>
34
35 /*
36 * The function is used to find the firmware data of one
37 * specific PCI device, which is attached to the indicated
38 * PCI bus. For VFs, their firmware data is linked to that
39 * one of PF's bridge. For other devices, their firmware
40 * data is linked to that of their bridge.
41 */
42 static struct pci_dn *pci_bus_to_pdn(struct pci_bus *bus)
43 {
44 struct pci_bus *pbus;
45 struct device_node *dn;
46 struct pci_dn *pdn;
47
48 /*
49 * We probably have virtual bus which doesn't
50 * have associated bridge.
51 */
52 pbus = bus;
53 while (pbus) {
54 if (pci_is_root_bus(pbus) || pbus->self)
55 break;
56
57 pbus = pbus->parent;
58 }
59
60 /*
61 * Except virtual bus, all PCI buses should
62 * have device nodes.
63 */
64 dn = pci_bus_to_OF_node(pbus);
65 pdn = dn ? PCI_DN(dn) : NULL;
66
67 return pdn;
68 }
69
70 struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
71 int devfn)
72 {
73 struct device_node *dn = NULL;
74 struct pci_dn *parent, *pdn;
75 struct pci_dev *pdev = NULL;
76
77 /* Fast path: fetch from PCI device */
78 list_for_each_entry(pdev, &bus->devices, bus_list) {
79 if (pdev->devfn == devfn) {
80 if (pdev->dev.archdata.pci_data)
81 return pdev->dev.archdata.pci_data;
82
83 dn = pci_device_to_OF_node(pdev);
84 break;
85 }
86 }
87
88 /* Fast path: fetch from device node */
89 pdn = dn ? PCI_DN(dn) : NULL;
90 if (pdn)
91 return pdn;
92
93 /* Slow path: fetch from firmware data hierarchy */
94 parent = pci_bus_to_pdn(bus);
95 if (!parent)
96 return NULL;
97
98 list_for_each_entry(pdn, &parent->child_list, list) {
99 if (pdn->busno == bus->number &&
100 pdn->devfn == devfn)
101 return pdn;
102 }
103
104 return NULL;
105 }
106
107 struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
108 {
109 struct device_node *dn;
110 struct pci_dn *parent, *pdn;
111
112 /* Search device directly */
113 if (pdev->dev.archdata.pci_data)
114 return pdev->dev.archdata.pci_data;
115
116 /* Check device node */
117 dn = pci_device_to_OF_node(pdev);
118 pdn = dn ? PCI_DN(dn) : NULL;
119 if (pdn)
120 return pdn;
121
122 /*
123 * VFs don't have device nodes. We hook their
124 * firmware data to PF's bridge.
125 */
126 parent = pci_bus_to_pdn(pdev->bus);
127 if (!parent)
128 return NULL;
129
130 list_for_each_entry(pdn, &parent->child_list, list) {
131 if (pdn->busno == pdev->bus->number &&
132 pdn->devfn == pdev->devfn)
133 return pdn;
134 }
135
136 return NULL;
137 }
138
139 #ifdef CONFIG_PCI_IOV
140 static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
141 struct pci_dev *pdev,
142 int vf_index,
143 int busno, int devfn)
144 {
145 struct pci_dn *pdn;
146
147 /* Except PHB, we always have the parent */
148 if (!parent)
149 return NULL;
150
151 pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
152 if (!pdn) {
153 dev_warn(&pdev->dev, "%s: Out of memory!\n", __func__);
154 return NULL;
155 }
156
157 pdn->phb = parent->phb;
158 pdn->parent = parent;
159 pdn->busno = busno;
160 pdn->devfn = devfn;
161 #ifdef CONFIG_PPC_POWERNV
162 pdn->vf_index = vf_index;
163 pdn->pe_number = IODA_INVALID_PE;
164 #endif
165 INIT_LIST_HEAD(&pdn->child_list);
166 INIT_LIST_HEAD(&pdn->list);
167 list_add_tail(&pdn->list, &parent->child_list);
168
169 /*
170 * If we already have PCI device instance, lets
171 * bind them.
172 */
173 if (pdev)
174 pdev->dev.archdata.pci_data = pdn;
175
176 return pdn;
177 }
178 #endif
179
180 struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
181 {
182 #ifdef CONFIG_PCI_IOV
183 struct pci_dn *parent, *pdn;
184 struct eeh_dev *edev;
185 int i;
186
187 /* Only support IOV for now */
188 if (!pdev->is_physfn)
189 return pci_get_pdn(pdev);
190
191 /* Check if VFs have been populated */
192 pdn = pci_get_pdn(pdev);
193 if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
194 return NULL;
195
196 pdn->flags |= PCI_DN_FLAG_IOV_VF;
197 parent = pci_bus_to_pdn(pdev->bus);
198 if (!parent)
199 return NULL;
200
201 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
202 pdn = add_one_dev_pci_data(parent, NULL, i,
203 pci_iov_virtfn_bus(pdev, i),
204 pci_iov_virtfn_devfn(pdev, i));
205 if (!pdn) {
206 dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
207 __func__, i);
208 return NULL;
209 }
210
211 /* Create the EEH device for the VF */
212 eeh_dev_init(pdn, pci_bus_to_host(pdev->bus));
213 edev = pdn_to_eeh_dev(pdn);
214 BUG_ON(!edev);
215 edev->physfn = pdev;
216 }
217 #endif /* CONFIG_PCI_IOV */
218
219 return pci_get_pdn(pdev);
220 }
221
222 void remove_dev_pci_data(struct pci_dev *pdev)
223 {
224 #ifdef CONFIG_PCI_IOV
225 struct pci_dn *parent;
226 struct pci_dn *pdn, *tmp;
227 struct eeh_dev *edev;
228 int i;
229
230 /*
231 * VF and VF PE are created/released dynamically, so we need to
232 * bind/unbind them. Otherwise the VF and VF PE would be mismatched
233 * when re-enabling SR-IOV.
234 */
235 if (pdev->is_virtfn) {
236 pdn = pci_get_pdn(pdev);
237 #ifdef CONFIG_PPC_POWERNV
238 pdn->pe_number = IODA_INVALID_PE;
239 #endif
240 return;
241 }
242
243 /* Only support IOV PF for now */
244 if (!pdev->is_physfn)
245 return;
246
247 /* Check if VFs have been populated */
248 pdn = pci_get_pdn(pdev);
249 if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF))
250 return;
251
252 pdn->flags &= ~PCI_DN_FLAG_IOV_VF;
253 parent = pci_bus_to_pdn(pdev->bus);
254 if (!parent)
255 return;
256
257 /*
258 * We might introduce flag to pci_dn in future
259 * so that we can release VF's firmware data in
260 * a batch mode.
261 */
262 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
263 list_for_each_entry_safe(pdn, tmp,
264 &parent->child_list, list) {
265 if (pdn->busno != pci_iov_virtfn_bus(pdev, i) ||
266 pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
267 continue;
268
269 /* Release EEH device for the VF */
270 edev = pdn_to_eeh_dev(pdn);
271 if (edev) {
272 pdn->edev = NULL;
273 kfree(edev);
274 }
275
276 if (!list_empty(&pdn->list))
277 list_del(&pdn->list);
278
279 kfree(pdn);
280 }
281 }
282 #endif /* CONFIG_PCI_IOV */
283 }
284
285 struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
286 struct device_node *dn)
287 {
288 const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
289 const __be32 *regs;
290 struct device_node *parent;
291 struct pci_dn *pdn;
292
293 pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
294 if (pdn == NULL)
295 return NULL;
296 dn->data = pdn;
297 pdn->node = dn;
298 pdn->phb = hose;
299 #ifdef CONFIG_PPC_POWERNV
300 pdn->pe_number = IODA_INVALID_PE;
301 #endif
302 regs = of_get_property(dn, "reg", NULL);
303 if (regs) {
304 u32 addr = of_read_number(regs, 1);
305
306 /* First register entry is addr (00BBSS00) */
307 pdn->busno = (addr >> 16) & 0xff;
308 pdn->devfn = (addr >> 8) & 0xff;
309 }
310
311 /* vendor/device IDs and class code */
312 regs = of_get_property(dn, "vendor-id", NULL);
313 pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
314 regs = of_get_property(dn, "device-id", NULL);
315 pdn->device_id = regs ? of_read_number(regs, 1) : 0;
316 regs = of_get_property(dn, "class-code", NULL);
317 pdn->class_code = regs ? of_read_number(regs, 1) : 0;
318
319 /* Extended config space */
320 pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
321
322 /* Attach to parent node */
323 INIT_LIST_HEAD(&pdn->child_list);
324 INIT_LIST_HEAD(&pdn->list);
325 parent = of_get_parent(dn);
326 pdn->parent = parent ? PCI_DN(parent) : NULL;
327 if (pdn->parent)
328 list_add_tail(&pdn->list, &pdn->parent->child_list);
329
330 return pdn;
331 }
332 EXPORT_SYMBOL_GPL(pci_add_device_node_info);
333
334 void pci_remove_device_node_info(struct device_node *dn)
335 {
336 struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL;
337 #ifdef CONFIG_EEH
338 struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
339
340 if (edev)
341 edev->pdn = NULL;
342 #endif
343
344 if (!pdn)
345 return;
346
347 WARN_ON(!list_empty(&pdn->child_list));
348 list_del(&pdn->list);
349 if (pdn->parent)
350 of_node_put(pdn->parent->node);
351
352 dn->data = NULL;
353 kfree(pdn);
354 }
355 EXPORT_SYMBOL_GPL(pci_remove_device_node_info);
356
357 /*
358 * Traverse a device tree stopping each PCI device in the tree.
359 * This is done depth first. As each node is processed, a "pre"
360 * function is called and the children are processed recursively.
361 *
362 * The "pre" func returns a value. If non-zero is returned from
363 * the "pre" func, the traversal stops and this value is returned.
364 * This return value is useful when using traverse as a method of
365 * finding a device.
366 *
367 * NOTE: we do not run the func for devices that do not appear to
368 * be PCI except for the start node which we assume (this is good
369 * because the start node is often a phb which may be missing PCI
370 * properties).
371 * We use the class-code as an indicator. If we run into
372 * one of these nodes we also assume its siblings are non-pci for
373 * performance.
374 */
375 void *pci_traverse_device_nodes(struct device_node *start,
376 void *(*fn)(struct device_node *, void *),
377 void *data)
378 {
379 struct device_node *dn, *nextdn;
380 void *ret;
381
382 /* We started with a phb, iterate all childs */
383 for (dn = start->child; dn; dn = nextdn) {
384 const __be32 *classp;
385 u32 class = 0;
386
387 nextdn = NULL;
388 classp = of_get_property(dn, "class-code", NULL);
389 if (classp)
390 class = of_read_number(classp, 1);
391
392 if (fn) {
393 ret = fn(dn, data);
394 if (ret)
395 return ret;
396 }
397
398 /* If we are a PCI bridge, go down */
399 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
400 (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
401 /* Depth first...do children */
402 nextdn = dn->child;
403 else if (dn->sibling)
404 /* ok, try next sibling instead. */
405 nextdn = dn->sibling;
406 if (!nextdn) {
407 /* Walk up to next valid sibling. */
408 do {
409 dn = dn->parent;
410 if (dn == start)
411 return NULL;
412 } while (dn->sibling == NULL);
413 nextdn = dn->sibling;
414 }
415 }
416 return NULL;
417 }
418 EXPORT_SYMBOL_GPL(pci_traverse_device_nodes);
419
420 static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
421 struct pci_dn *pdn)
422 {
423 struct list_head *next = pdn->child_list.next;
424
425 if (next != &pdn->child_list)
426 return list_entry(next, struct pci_dn, list);
427
428 while (1) {
429 if (pdn == root)
430 return NULL;
431
432 next = pdn->list.next;
433 if (next != &pdn->parent->child_list)
434 break;
435
436 pdn = pdn->parent;
437 }
438
439 return list_entry(next, struct pci_dn, list);
440 }
441
442 void *traverse_pci_dn(struct pci_dn *root,
443 void *(*fn)(struct pci_dn *, void *),
444 void *data)
445 {
446 struct pci_dn *pdn = root;
447 void *ret;
448
449 /* Only scan the child nodes */
450 for (pdn = pci_dn_next_one(root, pdn); pdn;
451 pdn = pci_dn_next_one(root, pdn)) {
452 ret = fn(pdn, data);
453 if (ret)
454 return ret;
455 }
456
457 return NULL;
458 }
459
460 static void *add_pdn(struct device_node *dn, void *data)
461 {
462 struct pci_controller *hose = data;
463 struct pci_dn *pdn;
464
465 pdn = pci_add_device_node_info(hose, dn);
466 if (!pdn)
467 return ERR_PTR(-ENOMEM);
468
469 return NULL;
470 }
471
472 /**
473 * pci_devs_phb_init_dynamic - setup pci devices under this PHB
474 * phb: pci-to-host bridge (top-level bridge connecting to cpu)
475 *
476 * This routine is called both during boot, (before the memory
477 * subsystem is set up, before kmalloc is valid) and during the
478 * dynamic lpar operation of adding a PHB to a running system.
479 */
480 void pci_devs_phb_init_dynamic(struct pci_controller *phb)
481 {
482 struct device_node *dn = phb->dn;
483 struct pci_dn *pdn;
484
485 /* PHB nodes themselves must not match */
486 pdn = pci_add_device_node_info(phb, dn);
487 if (pdn) {
488 pdn->devfn = pdn->busno = -1;
489 pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
490 pdn->phb = phb;
491 phb->pci_data = pdn;
492 }
493
494 /* Update dn->phb ptrs for new phb and children devices */
495 pci_traverse_device_nodes(dn, add_pdn, phb);
496 }
497
498 /**
499 * pci_devs_phb_init - Initialize phbs and pci devs under them.
500 *
501 * This routine walks over all phb's (pci-host bridges) on the
502 * system, and sets up assorted pci-related structures
503 * (including pci info in the device node structs) for each
504 * pci device found underneath. This routine runs once,
505 * early in the boot sequence.
506 */
507 void __init pci_devs_phb_init(void)
508 {
509 struct pci_controller *phb, *tmp;
510
511 /* This must be done first so the device nodes have valid pci info! */
512 list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
513 pci_devs_phb_init_dynamic(phb);
514 }
515
516 static void pci_dev_pdn_setup(struct pci_dev *pdev)
517 {
518 struct pci_dn *pdn;
519
520 if (pdev->dev.archdata.pci_data)
521 return;
522
523 /* Setup the fast path */
524 pdn = pci_get_pdn(pdev);
525 pdev->dev.archdata.pci_data = pdn;
526 }
527 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);
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