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1da177e4 LT |
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> | |
66b15db6 | 25 | #include <linux/export.h> |
1da177e4 | 26 | #include <linux/init.h> |
5a0e3ad6 | 27 | #include <linux/gfp.h> |
1da177e4 LT |
28 | |
29 | #include <asm/io.h> | |
30 | #include <asm/prom.h> | |
31 | #include <asm/pci-bridge.h> | |
d387899f | 32 | #include <asm/ppc-pci.h> |
095eed4f | 33 | #include <asm/firmware.h> |
1da177e4 | 34 | |
cca87d30 GS |
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 | ||
b72c1f65 BH |
107 | struct pci_dn *pci_get_pdn(struct pci_dev *pdev) |
108 | { | |
cca87d30 GS |
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) | |
b72c1f65 | 128 | return NULL; |
cca87d30 GS |
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; | |
b72c1f65 BH |
137 | } |
138 | ||
a8b2f828 GS |
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 busno, int devfn) | |
143 | { | |
144 | struct pci_dn *pdn; | |
145 | ||
146 | /* Except PHB, we always have the parent */ | |
147 | if (!parent) | |
148 | return NULL; | |
149 | ||
150 | pdn = kzalloc(sizeof(*pdn), GFP_KERNEL); | |
151 | if (!pdn) { | |
152 | dev_warn(&pdev->dev, "%s: Out of memory!\n", __func__); | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | pdn->phb = parent->phb; | |
157 | pdn->parent = parent; | |
158 | pdn->busno = busno; | |
159 | pdn->devfn = devfn; | |
160 | #ifdef CONFIG_PPC_POWERNV | |
161 | pdn->pe_number = IODA_INVALID_PE; | |
162 | #endif | |
163 | INIT_LIST_HEAD(&pdn->child_list); | |
164 | INIT_LIST_HEAD(&pdn->list); | |
165 | list_add_tail(&pdn->list, &parent->child_list); | |
166 | ||
167 | /* | |
168 | * If we already have PCI device instance, lets | |
169 | * bind them. | |
170 | */ | |
171 | if (pdev) | |
172 | pdev->dev.archdata.pci_data = pdn; | |
173 | ||
174 | return pdn; | |
175 | } | |
176 | #endif | |
177 | ||
178 | struct pci_dn *add_dev_pci_data(struct pci_dev *pdev) | |
179 | { | |
180 | #ifdef CONFIG_PCI_IOV | |
181 | struct pci_dn *parent, *pdn; | |
182 | int i; | |
183 | ||
184 | /* Only support IOV for now */ | |
185 | if (!pdev->is_physfn) | |
186 | return pci_get_pdn(pdev); | |
187 | ||
188 | /* Check if VFs have been populated */ | |
189 | pdn = pci_get_pdn(pdev); | |
190 | if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF)) | |
191 | return NULL; | |
192 | ||
193 | pdn->flags |= PCI_DN_FLAG_IOV_VF; | |
194 | parent = pci_bus_to_pdn(pdev->bus); | |
195 | if (!parent) | |
196 | return NULL; | |
197 | ||
198 | for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) { | |
199 | pdn = add_one_dev_pci_data(parent, NULL, | |
200 | pci_iov_virtfn_bus(pdev, i), | |
201 | pci_iov_virtfn_devfn(pdev, i)); | |
202 | if (!pdn) { | |
203 | dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n", | |
204 | __func__, i); | |
205 | return NULL; | |
206 | } | |
207 | } | |
208 | #endif /* CONFIG_PCI_IOV */ | |
209 | ||
210 | return pci_get_pdn(pdev); | |
211 | } | |
212 | ||
213 | void remove_dev_pci_data(struct pci_dev *pdev) | |
214 | { | |
215 | #ifdef CONFIG_PCI_IOV | |
216 | struct pci_dn *parent; | |
217 | struct pci_dn *pdn, *tmp; | |
218 | int i; | |
219 | ||
781a868f WY |
220 | /* |
221 | * VF and VF PE are created/released dynamically, so we need to | |
222 | * bind/unbind them. Otherwise the VF and VF PE would be mismatched | |
223 | * when re-enabling SR-IOV. | |
224 | */ | |
225 | if (pdev->is_virtfn) { | |
226 | pdn = pci_get_pdn(pdev); | |
227 | #ifdef CONFIG_PPC_POWERNV | |
228 | pdn->pe_number = IODA_INVALID_PE; | |
229 | #endif | |
230 | return; | |
231 | } | |
232 | ||
a8b2f828 GS |
233 | /* Only support IOV PF for now */ |
234 | if (!pdev->is_physfn) | |
235 | return; | |
236 | ||
237 | /* Check if VFs have been populated */ | |
238 | pdn = pci_get_pdn(pdev); | |
239 | if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF)) | |
240 | return; | |
241 | ||
242 | pdn->flags &= ~PCI_DN_FLAG_IOV_VF; | |
243 | parent = pci_bus_to_pdn(pdev->bus); | |
244 | if (!parent) | |
245 | return; | |
246 | ||
247 | /* | |
248 | * We might introduce flag to pci_dn in future | |
249 | * so that we can release VF's firmware data in | |
250 | * a batch mode. | |
251 | */ | |
252 | for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) { | |
253 | list_for_each_entry_safe(pdn, tmp, | |
254 | &parent->child_list, list) { | |
255 | if (pdn->busno != pci_iov_virtfn_bus(pdev, i) || | |
256 | pdn->devfn != pci_iov_virtfn_devfn(pdev, i)) | |
257 | continue; | |
258 | ||
259 | if (!list_empty(&pdn->list)) | |
260 | list_del(&pdn->list); | |
261 | ||
262 | kfree(pdn); | |
263 | } | |
264 | } | |
265 | #endif /* CONFIG_PCI_IOV */ | |
266 | } | |
267 | ||
1da177e4 LT |
268 | /* |
269 | * Traverse_func that inits the PCI fields of the device node. | |
270 | * NOTE: this *must* be done before read/write config to the device. | |
271 | */ | |
cad5cef6 | 272 | void *update_dn_pci_info(struct device_node *dn, void *data) |
1da177e4 LT |
273 | { |
274 | struct pci_controller *phb = data; | |
c6296b96 AB |
275 | const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL); |
276 | const __be32 *regs; | |
cca87d30 | 277 | struct device_node *parent; |
1635317f PM |
278 | struct pci_dn *pdn; |
279 | ||
a56555e5 | 280 | pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL); |
1635317f PM |
281 | if (pdn == NULL) |
282 | return NULL; | |
1635317f PM |
283 | dn->data = pdn; |
284 | pdn->node = dn; | |
285 | pdn->phb = phb; | |
184cd4a3 BH |
286 | #ifdef CONFIG_PPC_POWERNV |
287 | pdn->pe_number = IODA_INVALID_PE; | |
288 | #endif | |
e2eb6392 | 289 | regs = of_get_property(dn, "reg", NULL); |
1da177e4 | 290 | if (regs) { |
c6296b96 AB |
291 | u32 addr = of_read_number(regs, 1); |
292 | ||
1da177e4 | 293 | /* First register entry is addr (00BBSS00) */ |
c6296b96 AB |
294 | pdn->busno = (addr >> 16) & 0xff; |
295 | pdn->devfn = (addr >> 8) & 0xff; | |
1da177e4 LT |
296 | } |
297 | ||
c035ff1d GS |
298 | /* vendor/device IDs and class code */ |
299 | regs = of_get_property(dn, "vendor-id", NULL); | |
300 | pdn->vendor_id = regs ? of_read_number(regs, 1) : 0; | |
301 | regs = of_get_property(dn, "device-id", NULL); | |
302 | pdn->device_id = regs ? of_read_number(regs, 1) : 0; | |
303 | regs = of_get_property(dn, "class-code", NULL); | |
304 | pdn->class_code = regs ? of_read_number(regs, 1) : 0; | |
305 | ||
306 | /* Extended config space */ | |
c6296b96 | 307 | pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1); |
cca87d30 GS |
308 | |
309 | /* Attach to parent node */ | |
310 | INIT_LIST_HEAD(&pdn->child_list); | |
311 | INIT_LIST_HEAD(&pdn->list); | |
312 | parent = of_get_parent(dn); | |
313 | pdn->parent = parent ? PCI_DN(parent) : NULL; | |
314 | if (pdn->parent) | |
315 | list_add_tail(&pdn->list, &pdn->parent->child_list); | |
316 | ||
1da177e4 LT |
317 | return NULL; |
318 | } | |
319 | ||
320 | /* | |
321 | * Traverse a device tree stopping each PCI device in the tree. | |
322 | * This is done depth first. As each node is processed, a "pre" | |
323 | * function is called and the children are processed recursively. | |
324 | * | |
325 | * The "pre" func returns a value. If non-zero is returned from | |
326 | * the "pre" func, the traversal stops and this value is returned. | |
327 | * This return value is useful when using traverse as a method of | |
328 | * finding a device. | |
329 | * | |
330 | * NOTE: we do not run the func for devices that do not appear to | |
331 | * be PCI except for the start node which we assume (this is good | |
332 | * because the start node is often a phb which may be missing PCI | |
333 | * properties). | |
334 | * We use the class-code as an indicator. If we run into | |
335 | * one of these nodes we also assume its siblings are non-pci for | |
336 | * performance. | |
337 | */ | |
338 | void *traverse_pci_devices(struct device_node *start, traverse_func pre, | |
339 | void *data) | |
340 | { | |
341 | struct device_node *dn, *nextdn; | |
342 | void *ret; | |
343 | ||
344 | /* We started with a phb, iterate all childs */ | |
345 | for (dn = start->child; dn; dn = nextdn) { | |
c6296b96 AB |
346 | const __be32 *classp; |
347 | u32 class = 0; | |
1da177e4 LT |
348 | |
349 | nextdn = NULL; | |
e2eb6392 | 350 | classp = of_get_property(dn, "class-code", NULL); |
c6296b96 AB |
351 | if (classp) |
352 | class = of_read_number(classp, 1); | |
1da177e4 LT |
353 | |
354 | if (pre && ((ret = pre(dn, data)) != NULL)) | |
355 | return ret; | |
356 | ||
357 | /* If we are a PCI bridge, go down */ | |
358 | if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI || | |
359 | (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)) | |
360 | /* Depth first...do children */ | |
361 | nextdn = dn->child; | |
362 | else if (dn->sibling) | |
363 | /* ok, try next sibling instead. */ | |
364 | nextdn = dn->sibling; | |
365 | if (!nextdn) { | |
366 | /* Walk up to next valid sibling. */ | |
367 | do { | |
368 | dn = dn->parent; | |
369 | if (dn == start) | |
370 | return NULL; | |
371 | } while (dn->sibling == NULL); | |
372 | nextdn = dn->sibling; | |
373 | } | |
374 | } | |
375 | return NULL; | |
376 | } | |
377 | ||
e8e9b34c GS |
378 | static struct pci_dn *pci_dn_next_one(struct pci_dn *root, |
379 | struct pci_dn *pdn) | |
380 | { | |
381 | struct list_head *next = pdn->child_list.next; | |
382 | ||
383 | if (next != &pdn->child_list) | |
384 | return list_entry(next, struct pci_dn, list); | |
385 | ||
386 | while (1) { | |
387 | if (pdn == root) | |
388 | return NULL; | |
389 | ||
390 | next = pdn->list.next; | |
391 | if (next != &pdn->parent->child_list) | |
392 | break; | |
393 | ||
394 | pdn = pdn->parent; | |
395 | } | |
396 | ||
397 | return list_entry(next, struct pci_dn, list); | |
398 | } | |
399 | ||
400 | void *traverse_pci_dn(struct pci_dn *root, | |
401 | void *(*fn)(struct pci_dn *, void *), | |
402 | void *data) | |
403 | { | |
404 | struct pci_dn *pdn = root; | |
405 | void *ret; | |
406 | ||
407 | /* Only scan the child nodes */ | |
408 | for (pdn = pci_dn_next_one(root, pdn); pdn; | |
409 | pdn = pci_dn_next_one(root, pdn)) { | |
410 | ret = fn(pdn, data); | |
411 | if (ret) | |
412 | return ret; | |
413 | } | |
414 | ||
415 | return NULL; | |
416 | } | |
417 | ||
18126f35 LV |
418 | /** |
419 | * pci_devs_phb_init_dynamic - setup pci devices under this PHB | |
420 | * phb: pci-to-host bridge (top-level bridge connecting to cpu) | |
421 | * | |
422 | * This routine is called both during boot, (before the memory | |
423 | * subsystem is set up, before kmalloc is valid) and during the | |
424 | * dynamic lpar operation of adding a PHB to a running system. | |
425 | */ | |
cad5cef6 | 426 | void pci_devs_phb_init_dynamic(struct pci_controller *phb) |
1da177e4 | 427 | { |
44ef3390 | 428 | struct device_node *dn = phb->dn; |
1635317f | 429 | struct pci_dn *pdn; |
1da177e4 LT |
430 | |
431 | /* PHB nodes themselves must not match */ | |
1635317f PM |
432 | update_dn_pci_info(dn, phb); |
433 | pdn = dn->data; | |
cca87d30 | 434 | if (pdn) { |
1635317f | 435 | pdn->devfn = pdn->busno = -1; |
c035ff1d | 436 | pdn->vendor_id = pdn->device_id = pdn->class_code = 0; |
cca87d30 GS |
437 | pdn->phb = phb; |
438 | phb->pci_data = pdn; | |
439 | } | |
1da177e4 LT |
440 | |
441 | /* Update dn->phb ptrs for new phb and children devices */ | |
442 | traverse_pci_devices(dn, update_dn_pci_info, phb); | |
443 | } | |
444 | ||
18126f35 LV |
445 | /** |
446 | * pci_devs_phb_init - Initialize phbs and pci devs under them. | |
447 | * | |
448 | * This routine walks over all phb's (pci-host bridges) on the | |
449 | * system, and sets up assorted pci-related structures | |
450 | * (including pci info in the device node structs) for each | |
451 | * pci device found underneath. This routine runs once, | |
452 | * early in the boot sequence. | |
1da177e4 LT |
453 | */ |
454 | void __init pci_devs_phb_init(void) | |
455 | { | |
456 | struct pci_controller *phb, *tmp; | |
457 | ||
458 | /* This must be done first so the device nodes have valid pci info! */ | |
459 | list_for_each_entry_safe(phb, tmp, &hose_list, list_node) | |
460 | pci_devs_phb_init_dynamic(phb); | |
1da177e4 | 461 | } |
cca87d30 GS |
462 | |
463 | static void pci_dev_pdn_setup(struct pci_dev *pdev) | |
464 | { | |
465 | struct pci_dn *pdn; | |
466 | ||
467 | if (pdev->dev.archdata.pci_data) | |
468 | return; | |
469 | ||
470 | /* Setup the fast path */ | |
471 | pdn = pci_get_pdn(pdev); | |
472 | pdev->dev.archdata.pci_data = pdn; | |
473 | } | |
474 | DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup); |