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12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/pci.h>
16#include <linux/pci_hotplug.h>
17#include <linux/proc_fs.h>
18#include <linux/slab.h>
19#include <linux/types.h>
20#include <linux/mutex.h>
21
22#include <asm/sn/addrs.h>
23#include <asm/sn/geo.h>
24#include <asm/sn/l1.h>
25#include <asm/sn/module.h>
26#include <asm/sn/pcibr_provider.h>
27#include <asm/sn/pcibus_provider_defs.h>
28#include <asm/sn/pcidev.h>
29#include <asm/sn/sn_feature_sets.h>
30#include <asm/sn/sn_sal.h>
31#include <asm/sn/types.h>
32#include <linux/acpi.h>
33#include <asm/sn/acpi.h>
34
35#include "../pci.h"
36
37MODULE_LICENSE("GPL");
38MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
39MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
40
41
42
43#define PCI_SLOT_ALREADY_UP 2
44#define PCI_SLOT_ALREADY_DOWN 3
45#define PCI_L1_ERR 7
46#define PCI_EMPTY_33MHZ 15
47
48
49#define PCIIO_ASIC_TYPE_TIOCA 4
50#define PCI_L1_QSIZE 128
51#define SN_MAX_HP_SLOTS 32
52#define SN_SLOT_NAME_SIZE 33
53
54
55static struct list_head sn_hp_list;
56
57
58struct slot {
59 int device_num;
60 struct pci_bus *pci_bus;
61
62 struct hotplug_slot *hotplug_slot;
63 struct list_head hp_list;
64 char physical_path[SN_SLOT_NAME_SIZE];
65};
66
67struct pcibr_slot_enable_resp {
68 int resp_sub_errno;
69 char resp_l1_msg[PCI_L1_QSIZE + 1];
70};
71
72struct pcibr_slot_disable_resp {
73 int resp_sub_errno;
74 char resp_l1_msg[PCI_L1_QSIZE + 1];
75};
76
77enum sn_pci_req_e {
78 PCI_REQ_SLOT_ELIGIBLE,
79 PCI_REQ_SLOT_DISABLE
80};
81
82static int enable_slot(struct hotplug_slot *slot);
83static int disable_slot(struct hotplug_slot *slot);
84static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
85
86static struct hotplug_slot_ops sn_hotplug_slot_ops = {
87 .enable_slot = enable_slot,
88 .disable_slot = disable_slot,
89 .get_power_status = get_power_status,
90};
91
92static DEFINE_MUTEX(sn_hotplug_mutex);
93
94static ssize_t path_show(struct pci_slot *pci_slot, char *buf)
95{
96 int retval = -ENOENT;
97 struct slot *slot = pci_slot->hotplug->private;
98
99 if (!slot)
100 return retval;
101
102 retval = sprintf (buf, "%s\n", slot->physical_path);
103 return retval;
104}
105
106static struct pci_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
107
108static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
109{
110 struct pcibus_info *pcibus_info;
111 u16 busnum, segment, ioboard_type;
112
113 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
114
115
116 if (!(pcibus_info->pbi_valid_devices & (1 << device)))
117 return -EPERM;
118
119 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
120 busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
121 segment = pci_domain_nr(pci_bus) & 0xf;
122
123
124 if ((ioboard_type == L1_BRICKTYPE_IX ||
125 ioboard_type == L1_BRICKTYPE_IA) &&
126 (segment == 1 && busnum == 0 && device != 1))
127 return -EPERM;
128
129 return 1;
130}
131
132static int sn_pci_bus_valid(struct pci_bus *pci_bus)
133{
134 struct pcibus_info *pcibus_info;
135 u32 asic_type;
136 u16 ioboard_type;
137
138
139 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
140 asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
141 if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
142 return -EPERM;
143
144
145 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
146 switch (ioboard_type) {
147 case L1_BRICKTYPE_IX:
148 case L1_BRICKTYPE_PX:
149 case L1_BRICKTYPE_IA:
150 case L1_BRICKTYPE_PA:
151 case L1_BOARDTYPE_PCIX3SLOT:
152 return 1;
153 break;
154 default:
155 return -EPERM;
156 break;
157 }
158
159 return -EIO;
160}
161
162static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
163 struct pci_bus *pci_bus, int device,
164 char *name)
165{
166 struct pcibus_info *pcibus_info;
167 struct slot *slot;
168
169 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
170
171 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
172 if (!slot)
173 return -ENOMEM;
174 bss_hotplug_slot->private = slot;
175
176 slot->device_num = device;
177 slot->pci_bus = pci_bus;
178 sprintf(name, "%04x:%02x:%02x",
179 pci_domain_nr(pci_bus),
180 ((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
181 device + 1);
182
183 sn_generate_path(pci_bus, slot->physical_path);
184
185 slot->hotplug_slot = bss_hotplug_slot;
186 list_add(&slot->hp_list, &sn_hp_list);
187
188 return 0;
189}
190
191static struct hotplug_slot * sn_hp_destroy(void)
192{
193 struct slot *slot;
194 struct pci_slot *pci_slot;
195 struct hotplug_slot *bss_hotplug_slot = NULL;
196
197 list_for_each_entry(slot, &sn_hp_list, hp_list) {
198 bss_hotplug_slot = slot->hotplug_slot;
199 pci_slot = bss_hotplug_slot->pci_slot;
200 list_del(&((struct slot *)bss_hotplug_slot->private)->
201 hp_list);
202 sysfs_remove_file(&pci_slot->kobj,
203 &sn_slot_path_attr.attr);
204 break;
205 }
206 return bss_hotplug_slot;
207}
208
209static void sn_bus_free_data(struct pci_dev *dev)
210{
211 struct pci_bus *subordinate_bus;
212 struct pci_dev *child;
213
214
215 if (dev->subordinate) {
216 subordinate_bus = dev->subordinate;
217 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
218 sn_bus_free_data(child);
219 }
220
221
222
223
224
225
226 sn_bus_store_sysdata(dev);
227 sn_pci_unfixup_slot(dev);
228}
229
230static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
231 int device_num, char **ssdt)
232{
233 struct slot *slot = bss_hotplug_slot->private;
234 struct pcibus_info *pcibus_info;
235 struct pcibr_slot_enable_resp resp;
236 int rc;
237
238 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
239
240
241
242
243
244 rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
245
246
247 if (rc == PCI_SLOT_ALREADY_UP) {
248 dev_dbg(&slot->pci_bus->self->dev, "is already active\n");
249 return 1;
250 }
251
252 if (rc == PCI_L1_ERR) {
253 dev_dbg(&slot->pci_bus->self->dev,
254 "L1 failure %d with message: %s",
255 resp.resp_sub_errno, resp.resp_l1_msg);
256 return -EPERM;
257 }
258
259 if (rc) {
260 dev_dbg(&slot->pci_bus->self->dev,
261 "insert failed with error %d sub-error %d\n",
262 rc, resp.resp_sub_errno);
263 return -EIO;
264 }
265
266 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
267 pcibus_info->pbi_enabled_devices |= (1 << device_num);
268
269 return 0;
270}
271
272static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
273 int device_num, int action)
274{
275 struct slot *slot = bss_hotplug_slot->private;
276 struct pcibus_info *pcibus_info;
277 struct pcibr_slot_disable_resp resp;
278 int rc;
279
280 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
281
282 rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
283
284 if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
285 (rc == PCI_SLOT_ALREADY_DOWN)) {
286 dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path);
287 return 1;
288 }
289
290 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
291 dev_dbg(&slot->pci_bus->self->dev,
292 "Cannot remove last 33MHz card\n");
293 return -EPERM;
294 }
295
296 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
297 dev_dbg(&slot->pci_bus->self->dev,
298 "L1 failure %d with message \n%s\n",
299 resp.resp_sub_errno, resp.resp_l1_msg);
300 return -EPERM;
301 }
302
303 if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
304 dev_dbg(&slot->pci_bus->self->dev,
305 "remove failed with error %d sub-error %d\n",
306 rc, resp.resp_sub_errno);
307 return -EIO;
308 }
309
310 if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
311 return 0;
312
313 if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
314 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
315 pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
316 dev_dbg(&slot->pci_bus->self->dev, "remove successful\n");
317 return 0;
318 }
319
320 if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
321 dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc);
322 }
323
324 return rc;
325}
326
327
328
329
330
331
332static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
333{
334 struct slot *slot = bss_hotplug_slot->private;
335 struct pci_bus *new_bus = NULL;
336 struct pci_dev *dev;
337 int num_funcs;
338 int new_ppb = 0;
339 int rc;
340 char *ssdt = NULL;
341 void pcibios_fixup_device_resources(struct pci_dev *);
342
343
344 mutex_lock(&sn_hotplug_mutex);
345
346
347
348
349
350
351 rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
352 if (rc) {
353 mutex_unlock(&sn_hotplug_mutex);
354 return rc;
355 }
356
357 if (ssdt)
358 ssdt = __va(ssdt);
359
360 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
361 acpi_status ret;
362
363 ret = acpi_load_table((struct acpi_table_header *)ssdt);
364 if (ACPI_FAILURE(ret)) {
365 printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
366 __func__, ret);
367
368 }
369 }
370
371 num_funcs = pci_scan_slot(slot->pci_bus,
372 PCI_DEVFN(slot->device_num + 1, 0));
373 if (!num_funcs) {
374 dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n");
375 mutex_unlock(&sn_hotplug_mutex);
376 return -ENODEV;
377 }
378
379
380
381
382
383
384 list_for_each_entry(dev, &slot->pci_bus->devices, bus_list) {
385 if (PCI_SLOT(dev->devfn) != slot->device_num + 1)
386 continue;
387
388
389
390
391
392
393 pcibios_fixup_device_resources(dev);
394 if (SN_ACPI_BASE_SUPPORT())
395 sn_acpi_slot_fixup(dev);
396 else
397 sn_io_slot_fixup(dev);
398 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
399 pci_hp_add_bridge(dev);
400 if (dev->subordinate) {
401 new_bus = dev->subordinate;
402 new_ppb = 1;
403 }
404 }
405 }
406
407
408
409 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
410 unsigned long long adr;
411 struct acpi_device *pdevice;
412 acpi_handle phandle;
413 acpi_handle chandle = NULL;
414 acpi_handle rethandle;
415 acpi_status ret;
416
417 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
418
419 if (acpi_bus_get_device(phandle, &pdevice)) {
420 dev_dbg(&slot->pci_bus->self->dev,
421 "no parent device, assuming NULL\n");
422 pdevice = NULL;
423 }
424
425 acpi_scan_lock_acquire();
426
427
428
429
430
431 for (;;) {
432 rethandle = NULL;
433 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
434 phandle, chandle,
435 &rethandle);
436
437 if (ret == AE_NOT_FOUND || rethandle == NULL)
438 break;
439
440 chandle = rethandle;
441
442 ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
443 NULL, &adr);
444
445 if (ACPI_SUCCESS(ret) &&
446 (adr>>16) == (slot->device_num + 1)) {
447
448 ret = acpi_bus_scan(chandle);
449 if (ACPI_FAILURE(ret)) {
450 printk(KERN_ERR "%s: acpi_bus_scan "
451 "failed (0x%x) for slot %d "
452 "func %d\n", __func__,
453 ret, (int)(adr>>16),
454 (int)(adr&0xffff));
455
456 }
457 }
458 }
459 acpi_scan_lock_release();
460 }
461
462
463 pci_bus_add_devices(slot->pci_bus);
464
465 if (new_ppb)
466 pci_bus_add_devices(new_bus);
467
468 mutex_unlock(&sn_hotplug_mutex);
469
470 if (rc == 0)
471 dev_dbg(&slot->pci_bus->self->dev,
472 "insert operation successful\n");
473 else
474 dev_dbg(&slot->pci_bus->self->dev,
475 "insert operation failed rc = %d\n", rc);
476
477 return rc;
478}
479
480static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
481{
482 struct slot *slot = bss_hotplug_slot->private;
483 struct pci_dev *dev, *temp;
484 int rc;
485 acpi_owner_id ssdt_id = 0;
486
487
488 mutex_lock(&sn_hotplug_mutex);
489
490
491 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
492 PCI_REQ_SLOT_ELIGIBLE);
493 if (rc)
494 goto leaving;
495
496
497 if (SN_ACPI_BASE_SUPPORT() &&
498 PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
499 unsigned long long adr;
500 struct acpi_device *device;
501 acpi_handle phandle;
502 acpi_handle chandle = NULL;
503 acpi_handle rethandle;
504 acpi_status ret;
505
506
507 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
508
509 acpi_scan_lock_acquire();
510
511
512
513
514
515 for (;;) {
516 rethandle = NULL;
517 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
518 phandle, chandle,
519 &rethandle);
520
521 if (ret == AE_NOT_FOUND || rethandle == NULL)
522 break;
523
524 chandle = rethandle;
525
526 ret = acpi_evaluate_integer(chandle,
527 METHOD_NAME__ADR,
528 NULL, &adr);
529 if (ACPI_SUCCESS(ret) &&
530 (adr>>16) == (slot->device_num + 1)) {
531
532 acpi_get_id(chandle, &ssdt_id);
533
534 ret = acpi_bus_get_device(chandle,
535 &device);
536 if (ACPI_SUCCESS(ret))
537 acpi_bus_trim(device);
538 }
539 }
540 acpi_scan_lock_release();
541 }
542
543
544 list_for_each_entry_safe(dev, temp, &slot->pci_bus->devices, bus_list) {
545 if (PCI_SLOT(dev->devfn) != slot->device_num + 1)
546 continue;
547
548 pci_dev_get(dev);
549 sn_bus_free_data(dev);
550 pci_stop_and_remove_bus_device(dev);
551 pci_dev_put(dev);
552 }
553
554
555 if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
556 acpi_status ret;
557 ret = acpi_unload_table_id(ssdt_id);
558 if (ACPI_FAILURE(ret)) {
559 printk(KERN_ERR "%s: acpi_unload_table_id "
560 "failed (0x%x) for id %d\n",
561 __func__, ret, ssdt_id);
562
563 }
564 }
565
566
567 sn_bus_free_sysdata();
568
569
570 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
571 PCI_REQ_SLOT_DISABLE);
572 leaving:
573
574 mutex_unlock(&sn_hotplug_mutex);
575
576 return rc;
577}
578
579static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
580 u8 *value)
581{
582 struct slot *slot = bss_hotplug_slot->private;
583 struct pcibus_info *pcibus_info;
584 u32 power;
585
586 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
587 mutex_lock(&sn_hotplug_mutex);
588 power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
589 *value = power ? 1 : 0;
590 mutex_unlock(&sn_hotplug_mutex);
591 return 0;
592}
593
594static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
595{
596 kfree(bss_hotplug_slot->info);
597 kfree(bss_hotplug_slot->private);
598 kfree(bss_hotplug_slot);
599}
600
601static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
602{
603 int device;
604 struct pci_slot *pci_slot;
605 struct hotplug_slot *bss_hotplug_slot;
606 char name[SN_SLOT_NAME_SIZE];
607 int rc = 0;
608
609
610
611
612
613
614 for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
615 if (sn_pci_slot_valid(pci_bus, device) != 1)
616 continue;
617
618 bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
619 GFP_KERNEL);
620 if (!bss_hotplug_slot) {
621 rc = -ENOMEM;
622 goto alloc_err;
623 }
624
625 bss_hotplug_slot->info =
626 kzalloc(sizeof(struct hotplug_slot_info),
627 GFP_KERNEL);
628 if (!bss_hotplug_slot->info) {
629 rc = -ENOMEM;
630 goto alloc_err;
631 }
632
633 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
634 pci_bus, device, name)) {
635 rc = -ENOMEM;
636 goto alloc_err;
637 }
638 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
639 bss_hotplug_slot->release = &sn_release_slot;
640
641 rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
642 if (rc)
643 goto register_err;
644
645 pci_slot = bss_hotplug_slot->pci_slot;
646 rc = sysfs_create_file(&pci_slot->kobj,
647 &sn_slot_path_attr.attr);
648 if (rc)
649 goto register_err;
650 }
651 dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
652 return rc;
653
654register_err:
655 dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
656 rc);
657
658alloc_err:
659 if (rc == -ENOMEM)
660 dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
661
662
663 if (bss_hotplug_slot)
664 sn_release_slot(bss_hotplug_slot);
665
666
667 while ((bss_hotplug_slot = sn_hp_destroy()))
668 pci_hp_deregister(bss_hotplug_slot);
669
670 return rc;
671}
672
673static int __init sn_pci_hotplug_init(void)
674{
675 struct pci_bus *pci_bus = NULL;
676 int rc;
677 int registered = 0;
678
679 if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
680 printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
681 __func__);
682 return -EPERM;
683 }
684
685 INIT_LIST_HEAD(&sn_hp_list);
686
687 while ((pci_bus = pci_find_next_bus(pci_bus))) {
688 if (!pci_bus->sysdata)
689 continue;
690
691 rc = sn_pci_bus_valid(pci_bus);
692 if (rc != 1) {
693 dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
694 continue;
695 }
696 dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
697
698 rc = sn_hotplug_slot_register(pci_bus);
699 if (!rc) {
700 registered = 1;
701 } else {
702 registered = 0;
703 break;
704 }
705 }
706
707 return registered == 1 ? 0 : -ENODEV;
708}
709
710static void __exit sn_pci_hotplug_exit(void)
711{
712 struct hotplug_slot *bss_hotplug_slot;
713
714 while ((bss_hotplug_slot = sn_hp_destroy()))
715 pci_hp_deregister(bss_hotplug_slot);
716
717 if (!list_empty(&sn_hp_list))
718 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
719}
720
721module_init(sn_pci_hotplug_init);
722module_exit(sn_pci_hotplug_exit);
723