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24
25#include <linux/delay.h>
26#include <linux/export.h>
27#include <linux/gfp.h>
28#include <linux/kernel.h>
29#include <linux/pci.h>
30#include <linux/string.h>
31
32#include <asm/pci-bridge.h>
33#include <asm/ppc-pci.h>
34
35static int eeh_pe_aux_size = 0;
36static LIST_HEAD(eeh_phb_pe);
37
38
39
40
41
42
43
44void eeh_set_pe_aux_size(int size)
45{
46 if (size < 0)
47 return;
48
49 eeh_pe_aux_size = size;
50}
51
52
53
54
55
56
57
58
59static struct eeh_pe *eeh_pe_alloc(struct pci_controller *phb, int type)
60{
61 struct eeh_pe *pe;
62 size_t alloc_size;
63
64 alloc_size = sizeof(struct eeh_pe);
65 if (eeh_pe_aux_size) {
66 alloc_size = ALIGN(alloc_size, cache_line_size());
67 alloc_size += eeh_pe_aux_size;
68 }
69
70
71 pe = kzalloc(alloc_size, GFP_KERNEL);
72 if (!pe) return NULL;
73
74
75 pe->type = type;
76 pe->phb = phb;
77 INIT_LIST_HEAD(&pe->child_list);
78 INIT_LIST_HEAD(&pe->child);
79 INIT_LIST_HEAD(&pe->edevs);
80
81 pe->data = (void *)pe + ALIGN(sizeof(struct eeh_pe),
82 cache_line_size());
83 return pe;
84}
85
86
87
88
89
90
91
92
93int eeh_phb_pe_create(struct pci_controller *phb)
94{
95 struct eeh_pe *pe;
96
97
98 pe = eeh_pe_alloc(phb, EEH_PE_PHB);
99 if (!pe) {
100 pr_err("%s: out of memory!\n", __func__);
101 return -ENOMEM;
102 }
103
104
105 list_add_tail(&pe->child, &eeh_phb_pe);
106
107 pr_debug("EEH: Add PE for PHB#%d\n", phb->global_number);
108
109 return 0;
110}
111
112
113
114
115
116
117
118
119
120struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb)
121{
122 struct eeh_pe *pe;
123
124 list_for_each_entry(pe, &eeh_phb_pe, child) {
125
126
127
128
129
130 if ((pe->type & EEH_PE_PHB) && pe->phb == phb)
131 return pe;
132 }
133
134 return NULL;
135}
136
137
138
139
140
141
142
143
144
145static struct eeh_pe *eeh_pe_next(struct eeh_pe *pe,
146 struct eeh_pe *root)
147{
148 struct list_head *next = pe->child_list.next;
149
150 if (next == &pe->child_list) {
151 while (1) {
152 if (pe == root)
153 return NULL;
154 next = pe->child.next;
155 if (next != &pe->parent->child_list)
156 break;
157 pe = pe->parent;
158 }
159 }
160
161 return list_entry(next, struct eeh_pe, child);
162}
163
164
165
166
167
168
169
170
171
172
173
174
175void *eeh_pe_traverse(struct eeh_pe *root,
176 eeh_traverse_func fn, void *flag)
177{
178 struct eeh_pe *pe;
179 void *ret;
180
181 for (pe = root; pe; pe = eeh_pe_next(pe, root)) {
182 ret = fn(pe, flag);
183 if (ret) return ret;
184 }
185
186 return NULL;
187}
188
189
190
191
192
193
194
195
196
197
198void *eeh_pe_dev_traverse(struct eeh_pe *root,
199 eeh_traverse_func fn, void *flag)
200{
201 struct eeh_pe *pe;
202 struct eeh_dev *edev, *tmp;
203 void *ret;
204
205 if (!root) {
206 pr_warn("%s: Invalid PE %p\n",
207 __func__, root);
208 return NULL;
209 }
210
211
212 for (pe = root; pe; pe = eeh_pe_next(pe, root)) {
213 eeh_pe_for_each_dev(pe, edev, tmp) {
214 ret = fn(edev, flag);
215 if (ret)
216 return ret;
217 }
218 }
219
220 return NULL;
221}
222
223
224
225
226
227
228
229
230
231
232
233static void *__eeh_pe_get(void *data, void *flag)
234{
235 struct eeh_pe *pe = (struct eeh_pe *)data;
236 struct eeh_dev *edev = (struct eeh_dev *)flag;
237
238
239 if (pe->type & EEH_PE_PHB)
240 return NULL;
241
242
243
244
245
246 if (eeh_has_flag(EEH_VALID_PE_ZERO)) {
247 if (edev->pe_config_addr == pe->addr)
248 return pe;
249 } else {
250 if (edev->pe_config_addr &&
251 (edev->pe_config_addr == pe->addr))
252 return pe;
253 }
254
255
256 if (edev->config_addr &&
257 (edev->config_addr == pe->config_addr))
258 return pe;
259
260 return NULL;
261}
262
263
264
265
266
267
268
269
270
271
272
273
274struct eeh_pe *eeh_pe_get(struct eeh_dev *edev)
275{
276 struct eeh_pe *root = eeh_phb_pe_get(edev->phb);
277 struct eeh_pe *pe;
278
279 pe = eeh_pe_traverse(root, __eeh_pe_get, edev);
280
281 return pe;
282}
283
284
285
286
287
288
289
290
291
292static struct eeh_pe *eeh_pe_get_parent(struct eeh_dev *edev)
293{
294 struct device_node *dn;
295 struct eeh_dev *parent;
296
297
298
299
300
301
302 dn = edev->dn->parent;
303 while (dn) {
304
305 if (!PCI_DN(dn)) return NULL;
306
307 parent = of_node_to_eeh_dev(dn);
308
309 if (!parent) return NULL;
310
311 if (parent->pe)
312 return parent->pe;
313
314 dn = dn->parent;
315 }
316
317 return NULL;
318}
319
320
321
322
323
324
325
326
327
328
329int eeh_add_to_parent_pe(struct eeh_dev *edev)
330{
331 struct eeh_pe *pe, *parent;
332
333
334
335
336
337
338
339 pe = eeh_pe_get(edev);
340 if (pe && !(pe->type & EEH_PE_INVALID)) {
341 if (!edev->pe_config_addr) {
342 pr_err("%s: PE with addr 0x%x already exists\n",
343 __func__, edev->config_addr);
344 return -EEXIST;
345 }
346
347
348 pe->type = EEH_PE_BUS;
349 edev->pe = pe;
350
351
352 list_add_tail(&edev->list, &pe->edevs);
353 pr_debug("EEH: Add %s to Bus PE#%x\n",
354 edev->dn->full_name, pe->addr);
355
356 return 0;
357 } else if (pe && (pe->type & EEH_PE_INVALID)) {
358 list_add_tail(&edev->list, &pe->edevs);
359 edev->pe = pe;
360
361
362
363
364 parent = pe;
365 while (parent) {
366 if (!(parent->type & EEH_PE_INVALID))
367 break;
368 parent->type &= ~(EEH_PE_INVALID | EEH_PE_KEEP);
369 parent = parent->parent;
370 }
371 pr_debug("EEH: Add %s to Device PE#%x, Parent PE#%x\n",
372 edev->dn->full_name, pe->addr, pe->parent->addr);
373
374 return 0;
375 }
376
377
378 pe = eeh_pe_alloc(edev->phb, EEH_PE_DEVICE);
379 if (!pe) {
380 pr_err("%s: out of memory!\n", __func__);
381 return -ENOMEM;
382 }
383 pe->addr = edev->pe_config_addr;
384 pe->config_addr = edev->config_addr;
385
386
387
388
389
390
391
392 parent = eeh_pe_get_parent(edev);
393 if (!parent) {
394 parent = eeh_phb_pe_get(edev->phb);
395 if (!parent) {
396 pr_err("%s: No PHB PE is found (PHB Domain=%d)\n",
397 __func__, edev->phb->global_number);
398 edev->pe = NULL;
399 kfree(pe);
400 return -EEXIST;
401 }
402 }
403 pe->parent = parent;
404
405
406
407
408
409 list_add_tail(&pe->child, &parent->child_list);
410 list_add_tail(&edev->list, &pe->edevs);
411 edev->pe = pe;
412 pr_debug("EEH: Add %s to Device PE#%x, Parent PE#%x\n",
413 edev->dn->full_name, pe->addr, pe->parent->addr);
414
415 return 0;
416}
417
418
419
420
421
422
423
424
425
426
427int eeh_rmv_from_parent_pe(struct eeh_dev *edev)
428{
429 struct eeh_pe *pe, *parent, *child;
430 int cnt;
431
432 if (!edev->pe) {
433 pr_debug("%s: No PE found for EEH device %s\n",
434 __func__, edev->dn->full_name);
435 return -EEXIST;
436 }
437
438
439 pe = eeh_dev_to_pe(edev);
440 edev->pe = NULL;
441 list_del(&edev->list);
442
443
444
445
446
447
448
449 while (1) {
450 parent = pe->parent;
451 if (pe->type & EEH_PE_PHB)
452 break;
453
454 if (!(pe->state & EEH_PE_KEEP)) {
455 if (list_empty(&pe->edevs) &&
456 list_empty(&pe->child_list)) {
457 list_del(&pe->child);
458 kfree(pe);
459 } else {
460 break;
461 }
462 } else {
463 if (list_empty(&pe->edevs)) {
464 cnt = 0;
465 list_for_each_entry(child, &pe->child_list, child) {
466 if (!(child->type & EEH_PE_INVALID)) {
467 cnt++;
468 break;
469 }
470 }
471
472 if (!cnt)
473 pe->type |= EEH_PE_INVALID;
474 else
475 break;
476 }
477 }
478
479 pe = parent;
480 }
481
482 return 0;
483}
484
485
486
487
488
489
490
491
492
493
494void eeh_pe_update_time_stamp(struct eeh_pe *pe)
495{
496 struct timeval tstamp;
497
498 if (!pe) return;
499
500 if (pe->freeze_count <= 0) {
501 pe->freeze_count = 0;
502 do_gettimeofday(&pe->tstamp);
503 } else {
504 do_gettimeofday(&tstamp);
505 if (tstamp.tv_sec - pe->tstamp.tv_sec > 3600) {
506 pe->tstamp = tstamp;
507 pe->freeze_count = 0;
508 }
509 }
510}
511
512
513
514
515
516
517
518
519
520
521static void *__eeh_pe_state_mark(void *data, void *flag)
522{
523 struct eeh_pe *pe = (struct eeh_pe *)data;
524 int state = *((int *)flag);
525 struct eeh_dev *edev, *tmp;
526 struct pci_dev *pdev;
527
528
529 if (pe->state & EEH_PE_REMOVED)
530 return NULL;
531
532 pe->state |= state;
533
534
535 if (!(state & EEH_PE_ISOLATED))
536 return NULL;
537
538 eeh_pe_for_each_dev(pe, edev, tmp) {
539 pdev = eeh_dev_to_pci_dev(edev);
540 if (pdev)
541 pdev->error_state = pci_channel_io_frozen;
542 }
543
544
545 if (pe->state & EEH_PE_CFG_RESTRICTED)
546 pe->state |= EEH_PE_CFG_BLOCKED;
547
548 return NULL;
549}
550
551
552
553
554
555
556
557
558
559void eeh_pe_state_mark(struct eeh_pe *pe, int state)
560{
561 eeh_pe_traverse(pe, __eeh_pe_state_mark, &state);
562}
563
564static void *__eeh_pe_dev_mode_mark(void *data, void *flag)
565{
566 struct eeh_dev *edev = data;
567 int mode = *((int *)flag);
568
569 edev->mode |= mode;
570
571 return NULL;
572}
573
574
575
576
577
578
579
580void eeh_pe_dev_mode_mark(struct eeh_pe *pe, int mode)
581{
582 eeh_pe_dev_traverse(pe, __eeh_pe_dev_mode_mark, &mode);
583}
584
585
586
587
588
589
590
591
592
593
594static void *__eeh_pe_state_clear(void *data, void *flag)
595{
596 struct eeh_pe *pe = (struct eeh_pe *)data;
597 int state = *((int *)flag);
598 struct eeh_dev *edev, *tmp;
599 struct pci_dev *pdev;
600
601
602 if (pe->state & EEH_PE_REMOVED)
603 return NULL;
604
605 pe->state &= ~state;
606
607
608
609
610
611
612 if (!(state & EEH_PE_ISOLATED))
613 return NULL;
614
615 pe->check_count = 0;
616 eeh_pe_for_each_dev(pe, edev, tmp) {
617 pdev = eeh_dev_to_pci_dev(edev);
618 if (!pdev)
619 continue;
620
621 pdev->error_state = pci_channel_io_normal;
622 }
623
624
625 if (pe->state & EEH_PE_CFG_RESTRICTED)
626 pe->state &= ~EEH_PE_CFG_BLOCKED;
627
628 return NULL;
629}
630
631
632
633
634
635
636
637
638
639
640void eeh_pe_state_clear(struct eeh_pe *pe, int state)
641{
642 eeh_pe_traverse(pe, __eeh_pe_state_clear, &state);
643}
644
645
646
647
648
649
650
651
652
653
654
655
656static void eeh_bridge_check_link(struct eeh_dev *edev,
657 struct device_node *dn)
658{
659 int cap;
660 uint32_t val;
661 int timeout = 0;
662
663
664
665
666
667 if (!(edev->mode & (EEH_DEV_ROOT_PORT | EEH_DEV_DS_PORT)))
668 return;
669
670 pr_debug("%s: Check PCIe link for %04x:%02x:%02x.%01x ...\n",
671 __func__, edev->phb->global_number,
672 edev->config_addr >> 8,
673 PCI_SLOT(edev->config_addr & 0xFF),
674 PCI_FUNC(edev->config_addr & 0xFF));
675
676
677 cap = edev->pcie_cap;
678 eeh_ops->read_config(dn, cap + PCI_EXP_SLTSTA, 2, &val);
679 if (!(val & PCI_EXP_SLTSTA_PDS)) {
680 pr_debug(" No card in the slot (0x%04x) !\n", val);
681 return;
682 }
683
684
685 eeh_ops->read_config(dn, cap + PCI_EXP_SLTCAP, 2, &val);
686 if (val & PCI_EXP_SLTCAP_PCP) {
687 eeh_ops->read_config(dn, cap + PCI_EXP_SLTCTL, 2, &val);
688 if (val & PCI_EXP_SLTCTL_PCC) {
689 pr_debug(" In power-off state, power it on ...\n");
690 val &= ~(PCI_EXP_SLTCTL_PCC | PCI_EXP_SLTCTL_PIC);
691 val |= (0x0100 & PCI_EXP_SLTCTL_PIC);
692 eeh_ops->write_config(dn, cap + PCI_EXP_SLTCTL, 2, val);
693 msleep(2 * 1000);
694 }
695 }
696
697
698 eeh_ops->read_config(dn, cap + PCI_EXP_LNKCTL, 2, &val);
699 val &= ~PCI_EXP_LNKCTL_LD;
700 eeh_ops->write_config(dn, cap + PCI_EXP_LNKCTL, 2, val);
701
702
703 eeh_ops->read_config(dn, cap + PCI_EXP_LNKCAP, 4, &val);
704 if (!(val & PCI_EXP_LNKCAP_DLLLARC)) {
705 pr_debug(" No link reporting capability (0x%08x) \n", val);
706 msleep(1000);
707 return;
708 }
709
710
711 timeout = 0;
712 while (timeout < 5000) {
713 msleep(20);
714 timeout += 20;
715
716 eeh_ops->read_config(dn, cap + PCI_EXP_LNKSTA, 2, &val);
717 if (val & PCI_EXP_LNKSTA_DLLLA)
718 break;
719 }
720
721 if (val & PCI_EXP_LNKSTA_DLLLA)
722 pr_debug(" Link up (%s)\n",
723 (val & PCI_EXP_LNKSTA_CLS_2_5GB) ? "2.5GB" : "5GB");
724 else
725 pr_debug(" Link not ready (0x%04x)\n", val);
726}
727
728#define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF))
729#define SAVED_BYTE(OFF) (((u8 *)(edev->config_space))[BYTE_SWAP(OFF)])
730
731static void eeh_restore_bridge_bars(struct eeh_dev *edev,
732 struct device_node *dn)
733{
734 int i;
735
736
737
738
739
740 for (i = 4; i < 13; i++)
741 eeh_ops->write_config(dn, i*4, 4, edev->config_space[i]);
742
743 eeh_ops->write_config(dn, 14*4, 4, edev->config_space[14]);
744
745
746 eeh_ops->write_config(dn, PCI_CACHE_LINE_SIZE, 1,
747 SAVED_BYTE(PCI_CACHE_LINE_SIZE));
748 eeh_ops->write_config(dn, PCI_LATENCY_TIMER, 1,
749 SAVED_BYTE(PCI_LATENCY_TIMER));
750
751 eeh_ops->write_config(dn, 15*4, 4, edev->config_space[15]);
752
753
754 eeh_ops->write_config(dn, PCI_COMMAND, 4, edev->config_space[1]);
755
756
757 eeh_bridge_check_link(edev, dn);
758}
759
760static void eeh_restore_device_bars(struct eeh_dev *edev,
761 struct device_node *dn)
762{
763 int i;
764 u32 cmd;
765
766 for (i = 4; i < 10; i++)
767 eeh_ops->write_config(dn, i*4, 4, edev->config_space[i]);
768
769 eeh_ops->write_config(dn, 12*4, 4, edev->config_space[12]);
770
771 eeh_ops->write_config(dn, PCI_CACHE_LINE_SIZE, 1,
772 SAVED_BYTE(PCI_CACHE_LINE_SIZE));
773 eeh_ops->write_config(dn, PCI_LATENCY_TIMER, 1,
774 SAVED_BYTE(PCI_LATENCY_TIMER));
775
776
777 eeh_ops->write_config(dn, 15*4, 4, edev->config_space[15]);
778
779
780
781
782
783 eeh_ops->read_config(dn, PCI_COMMAND, 4, &cmd);
784 if (edev->config_space[1] & PCI_COMMAND_PARITY)
785 cmd |= PCI_COMMAND_PARITY;
786 else
787 cmd &= ~PCI_COMMAND_PARITY;
788 if (edev->config_space[1] & PCI_COMMAND_SERR)
789 cmd |= PCI_COMMAND_SERR;
790 else
791 cmd &= ~PCI_COMMAND_SERR;
792 eeh_ops->write_config(dn, PCI_COMMAND, 4, cmd);
793}
794
795
796
797
798
799
800
801
802
803
804static void *eeh_restore_one_device_bars(void *data, void *flag)
805{
806 struct eeh_dev *edev = (struct eeh_dev *)data;
807 struct device_node *dn = eeh_dev_to_of_node(edev);
808
809
810 if (edev->mode & EEH_DEV_BRIDGE)
811 eeh_restore_bridge_bars(edev, dn);
812 else
813 eeh_restore_device_bars(edev, dn);
814
815 if (eeh_ops->restore_config)
816 eeh_ops->restore_config(dn);
817
818 return NULL;
819}
820
821
822
823
824
825
826
827
828void eeh_pe_restore_bars(struct eeh_pe *pe)
829{
830
831
832
833
834 eeh_pe_dev_traverse(pe, eeh_restore_one_device_bars, NULL);
835}
836
837
838
839
840
841
842
843
844
845
846const char *eeh_pe_loc_get(struct eeh_pe *pe)
847{
848 struct pci_bus *bus = eeh_pe_bus_get(pe);
849 struct device_node *dn = pci_bus_to_OF_node(bus);
850 const char *loc = NULL;
851
852 if (!dn)
853 goto out;
854
855
856 if (pci_is_root_bus(bus)) {
857 loc = of_get_property(dn, "ibm,loc-code", NULL);
858 if (!loc)
859 loc = of_get_property(dn, "ibm,io-base-loc-code", NULL);
860 if (loc)
861 goto out;
862
863
864 dn = dn->child;
865 if (!dn)
866 goto out;
867 }
868
869 loc = of_get_property(dn, "ibm,loc-code", NULL);
870 if (!loc)
871 loc = of_get_property(dn, "ibm,slot-location-code", NULL);
872
873out:
874 return loc ? loc : "N/A";
875}
876
877
878
879
880
881
882
883
884
885
886
887struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe)
888{
889 struct pci_bus *bus = NULL;
890 struct eeh_dev *edev;
891 struct pci_dev *pdev;
892
893 if (pe->type & EEH_PE_PHB) {
894 bus = pe->phb->bus;
895 } else if (pe->type & EEH_PE_BUS ||
896 pe->type & EEH_PE_DEVICE) {
897 if (pe->bus) {
898 bus = pe->bus;
899 goto out;
900 }
901
902 edev = list_first_entry(&pe->edevs, struct eeh_dev, list);
903 pdev = eeh_dev_to_pci_dev(edev);
904 if (pdev)
905 bus = pdev->bus;
906 }
907
908out:
909 return bus;
910}
911