1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.
7 *
8 * This work was based on the 2.4/2.6 kernel development by Dick Reigner.
9 * Work to add BIOS PROM support was completed by Mike Habeck.
10 */
11
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/types.h>
19 #include <linux/mutex.h>
20
21 #include <asm/sn/addrs.h>
22 #include <asm/sn/geo.h>
23 #include <asm/sn/l1.h>
24 #include <asm/sn/module.h>
25 #include <asm/sn/pcibr_provider.h>
26 #include <asm/sn/pcibus_provider_defs.h>
27 #include <asm/sn/pcidev.h>
28 #include <asm/sn/sn_feature_sets.h>
29 #include <asm/sn/sn_sal.h>
30 #include <asm/sn/types.h>
31 #include <linux/acpi.h>
32 #include <asm/sn/acpi.h>
33
34 #include "../pci.h"
35
36 MODULE_LICENSE("GPL");
37 MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
38 MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
39
40
41 /* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */
42 #define PCI_SLOT_ALREADY_UP 2 /* slot already up */
43 #define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
44 #define PCI_L1_ERR 7 /* L1 console command error */
45 #define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
46
47
48 #define PCIIO_ASIC_TYPE_TIOCA 4
49 #define PCI_L1_QSIZE 128 /* our L1 message buffer size */
50 #define SN_MAX_HP_SLOTS 32 /* max hotplug slots */
51 #define SN_SLOT_NAME_SIZE 33 /* size of name string */
52
53 /* internal list head */
54 static struct list_head sn_hp_list;
55
56 /* hotplug_slot struct's private pointer */
57 struct slot {
58 int device_num;
59 struct pci_bus *pci_bus;
60 /* this struct for glue internal only */
61 struct hotplug_slot *hotplug_slot;
62 struct list_head hp_list;
63 char physical_path[SN_SLOT_NAME_SIZE];
64 };
65
66 struct pcibr_slot_enable_resp {
67 int resp_sub_errno;
68 char resp_l1_msg[PCI_L1_QSIZE + 1];
69 };
70
71 struct pcibr_slot_disable_resp {
72 int resp_sub_errno;
73 char resp_l1_msg[PCI_L1_QSIZE + 1];
74 };
75
76 enum sn_pci_req_e {
77 PCI_REQ_SLOT_ELIGIBLE,
78 PCI_REQ_SLOT_DISABLE
79 };
80
81 static int enable_slot(struct hotplug_slot *slot);
82 static int disable_slot(struct hotplug_slot *slot);
83 static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
84
85 static struct hotplug_slot_ops sn_hotplug_slot_ops = {
86 .owner = THIS_MODULE,
87 .enable_slot = enable_slot,
88 .disable_slot = disable_slot,
89 .get_power_status = get_power_status,
90 };
91
92 static DEFINE_MUTEX(sn_hotplug_mutex);
93
path_show(struct hotplug_slot * bss_hotplug_slot,char * buf)94 static ssize_t path_show (struct hotplug_slot *bss_hotplug_slot,
95 char *buf)
96 {
97 int retval = -ENOENT;
98 struct slot *slot = bss_hotplug_slot->private;
99
100 if (!slot)
101 return retval;
102
103 retval = sprintf (buf, "%s\n", slot->physical_path);
104 return retval;
105 }
106
107 static struct hotplug_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
108
sn_pci_slot_valid(struct pci_bus * pci_bus,int device)109 static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
110 {
111 struct pcibus_info *pcibus_info;
112 u16 busnum, segment, ioboard_type;
113
114 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
115
116 /* Check to see if this is a valid slot on 'pci_bus' */
117 if (!(pcibus_info->pbi_valid_devices & (1 << device)))
118 return -EPERM;
119
120 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
121 busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
122 segment = pci_domain_nr(pci_bus) & 0xf;
123
124 /* Do not allow hotplug operations on base I/O cards */
125 if ((ioboard_type == L1_BRICKTYPE_IX ||
126 ioboard_type == L1_BRICKTYPE_IA) &&
127 (segment == 1 && busnum == 0 && device != 1))
128 return -EPERM;
129
130 return 1;
131 }
132
sn_pci_bus_valid(struct pci_bus * pci_bus)133 static int sn_pci_bus_valid(struct pci_bus *pci_bus)
134 {
135 struct pcibus_info *pcibus_info;
136 u32 asic_type;
137 u16 ioboard_type;
138
139 /* Don't register slots hanging off the TIOCA bus */
140 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
141 asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
142 if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
143 return -EPERM;
144
145 /* Only register slots in I/O Bricks that support hotplug */
146 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
147 switch (ioboard_type) {
148 case L1_BRICKTYPE_IX:
149 case L1_BRICKTYPE_PX:
150 case L1_BRICKTYPE_IA:
151 case L1_BRICKTYPE_PA:
152 case L1_BOARDTYPE_PCIX3SLOT:
153 return 1;
154 break;
155 default:
156 return -EPERM;
157 break;
158 }
159
160 return -EIO;
161 }
162
sn_hp_slot_private_alloc(struct hotplug_slot * bss_hotplug_slot,struct pci_bus * pci_bus,int device,char * name)163 static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
164 struct pci_bus *pci_bus, int device,
165 char *name)
166 {
167 struct pcibus_info *pcibus_info;
168 struct slot *slot;
169
170 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
171
172 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
173 if (!slot)
174 return -ENOMEM;
175 bss_hotplug_slot->private = slot;
176
177 slot->device_num = device;
178 slot->pci_bus = pci_bus;
179 sprintf(name, "%04x:%02x:%02x",
180 pci_domain_nr(pci_bus),
181 ((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
182 device + 1);
183
184 sn_generate_path(pci_bus, slot->physical_path);
185
186 slot->hotplug_slot = bss_hotplug_slot;
187 list_add(&slot->hp_list, &sn_hp_list);
188
189 return 0;
190 }
191
sn_hp_destroy(void)192 static struct hotplug_slot * sn_hp_destroy(void)
193 {
194 struct slot *slot;
195 struct pci_slot *pci_slot;
196 struct hotplug_slot *bss_hotplug_slot = NULL;
197
198 list_for_each_entry(slot, &sn_hp_list, hp_list) {
199 bss_hotplug_slot = slot->hotplug_slot;
200 pci_slot = bss_hotplug_slot->pci_slot;
201 list_del(&((struct slot *)bss_hotplug_slot->private)->
202 hp_list);
203 sysfs_remove_file(&pci_slot->kobj,
204 &sn_slot_path_attr.attr);
205 break;
206 }
207 return bss_hotplug_slot;
208 }
209
sn_bus_free_data(struct pci_dev * dev)210 static void sn_bus_free_data(struct pci_dev *dev)
211 {
212 struct pci_bus *subordinate_bus;
213 struct pci_dev *child;
214
215 /* Recursively clean up sn_irq_info structs */
216 if (dev->subordinate) {
217 subordinate_bus = dev->subordinate;
218 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
219 sn_bus_free_data(child);
220 }
221 /*
222 * Some drivers may use dma accesses during the
223 * driver remove function. We release the sysdata
224 * areas after the driver remove functions have
225 * been called.
226 */
227 sn_bus_store_sysdata(dev);
228 sn_pci_unfixup_slot(dev);
229 }
230
sn_slot_enable(struct hotplug_slot * bss_hotplug_slot,int device_num,char ** ssdt)231 static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
232 int device_num, char **ssdt)
233 {
234 struct slot *slot = bss_hotplug_slot->private;
235 struct pcibus_info *pcibus_info;
236 struct pcibr_slot_enable_resp resp;
237 int rc;
238
239 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
240
241 /*
242 * Power-on and initialize the slot in the SN
243 * PCI infrastructure.
244 */
245 rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
246
247
248 if (rc == PCI_SLOT_ALREADY_UP) {
249 dev_dbg(&slot->pci_bus->self->dev, "is already active\n");
250 return 1; /* return 1 to user */
251 }
252
253 if (rc == PCI_L1_ERR) {
254 dev_dbg(&slot->pci_bus->self->dev,
255 "L1 failure %d with message: %s",
256 resp.resp_sub_errno, resp.resp_l1_msg);
257 return -EPERM;
258 }
259
260 if (rc) {
261 dev_dbg(&slot->pci_bus->self->dev,
262 "insert failed with error %d sub-error %d\n",
263 rc, resp.resp_sub_errno);
264 return -EIO;
265 }
266
267 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
268 pcibus_info->pbi_enabled_devices |= (1 << device_num);
269
270 return 0;
271 }
272
sn_slot_disable(struct hotplug_slot * bss_hotplug_slot,int device_num,int action)273 static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
274 int device_num, int action)
275 {
276 struct slot *slot = bss_hotplug_slot->private;
277 struct pcibus_info *pcibus_info;
278 struct pcibr_slot_disable_resp resp;
279 int rc;
280
281 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
282
283 rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
284
285 if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
286 (rc == PCI_SLOT_ALREADY_DOWN)) {
287 dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path);
288 return 1; /* return 1 to user */
289 }
290
291 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
292 dev_dbg(&slot->pci_bus->self->dev,
293 "Cannot remove last 33MHz card\n");
294 return -EPERM;
295 }
296
297 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
298 dev_dbg(&slot->pci_bus->self->dev,
299 "L1 failure %d with message \n%s\n",
300 resp.resp_sub_errno, resp.resp_l1_msg);
301 return -EPERM;
302 }
303
304 if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
305 dev_dbg(&slot->pci_bus->self->dev,
306 "remove failed with error %d sub-error %d\n",
307 rc, resp.resp_sub_errno);
308 return -EIO;
309 }
310
311 if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
312 return 0;
313
314 if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
315 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
316 pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
317 dev_dbg(&slot->pci_bus->self->dev, "remove successful\n");
318 return 0;
319 }
320
321 if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
322 dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc);
323 }
324
325 return rc;
326 }
327
328 /*
329 * Power up and configure the slot via a SAL call to PROM.
330 * Scan slot (and any children), do any platform specific fixup,
331 * and find device driver.
332 */
enable_slot(struct hotplug_slot * bss_hotplug_slot)333 static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
334 {
335 struct slot *slot = bss_hotplug_slot->private;
336 struct pci_bus *new_bus = NULL;
337 struct pci_dev *dev;
338 int func, num_funcs;
339 int new_ppb = 0;
340 int rc;
341 char *ssdt = NULL;
342 void pcibios_fixup_device_resources(struct pci_dev *);
343
344 /* Serialize the Linux PCI infrastructure */
345 mutex_lock(&sn_hotplug_mutex);
346
347 /*
348 * Power-on and initialize the slot in the SN
349 * PCI infrastructure. Also, retrieve the ACPI SSDT
350 * table for the slot (if ACPI capable PROM).
351 */
352 rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
353 if (rc) {
354 mutex_unlock(&sn_hotplug_mutex);
355 return rc;
356 }
357
358 if (ssdt)
359 ssdt = __va(ssdt);
360 /* Add the new SSDT for the slot to the ACPI namespace */
361 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
362 acpi_status ret;
363
364 ret = acpi_load_table((struct acpi_table_header *)ssdt);
365 if (ACPI_FAILURE(ret)) {
366 printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
367 __func__, ret);
368 /* try to continue on */
369 }
370 }
371
372 num_funcs = pci_scan_slot(slot->pci_bus,
373 PCI_DEVFN(slot->device_num + 1, 0));
374 if (!num_funcs) {
375 dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n");
376 mutex_unlock(&sn_hotplug_mutex);
377 return -ENODEV;
378 }
379
380 /*
381 * Map SN resources for all functions on the card
382 * to the Linux PCI interface and tell the drivers
383 * about them.
384 */
385 for (func = 0; func < num_funcs; func++) {
386 dev = pci_get_slot(slot->pci_bus,
387 PCI_DEVFN(slot->device_num + 1,
388 PCI_FUNC(func)));
389 if (dev) {
390 /* Need to do slot fixup on PPB before fixup of children
391 * (PPB's pcidev_info needs to be in pcidev_info list
392 * before child's SN_PCIDEV_INFO() call to setup
393 * pdi_host_pcidev_info).
394 */
395 pcibios_fixup_device_resources(dev);
396 if (SN_ACPI_BASE_SUPPORT())
397 sn_acpi_slot_fixup(dev);
398 else
399 sn_io_slot_fixup(dev);
400 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
401 unsigned char sec_bus;
402 pci_read_config_byte(dev, PCI_SECONDARY_BUS,
403 &sec_bus);
404 new_bus = pci_add_new_bus(dev->bus, dev,
405 sec_bus);
406 pci_scan_child_bus(new_bus);
407 new_ppb = 1;
408 }
409 pci_dev_put(dev);
410 }
411 }
412
413 /*
414 * Add the slot's devices to the ACPI infrastructure */
415 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
416 unsigned long long adr;
417 struct acpi_device *pdevice;
418 struct acpi_device *device;
419 acpi_handle phandle;
420 acpi_handle chandle = NULL;
421 acpi_handle rethandle;
422 acpi_status ret;
423
424 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
425
426 if (acpi_bus_get_device(phandle, &pdevice)) {
427 dev_dbg(&slot->pci_bus->self->dev,
428 "no parent device, assuming NULL\n");
429 pdevice = NULL;
430 }
431
432 /*
433 * Walk the rootbus node's immediate children looking for
434 * the slot's device node(s). There can be more than
435 * one for multifunction devices.
436 */
437 for (;;) {
438 rethandle = NULL;
439 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
440 phandle, chandle,
441 &rethandle);
442
443 if (ret == AE_NOT_FOUND || rethandle == NULL)
444 break;
445
446 chandle = rethandle;
447
448 ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
449 NULL, &adr);
450
451 if (ACPI_SUCCESS(ret) &&
452 (adr>>16) == (slot->device_num + 1)) {
453
454 ret = acpi_bus_add(&device, pdevice, chandle,
455 ACPI_BUS_TYPE_DEVICE);
456 if (ACPI_FAILURE(ret)) {
457 printk(KERN_ERR "%s: acpi_bus_add "
458 "failed (0x%x) for slot %d "
459 "func %d\n", __func__,
460 ret, (int)(adr>>16),
461 (int)(adr&0xffff));
462 /* try to continue on */
463 } else {
464 acpi_bus_start(device);
465 }
466 }
467 }
468 }
469
470 /* Call the driver for the new device */
471 pci_bus_add_devices(slot->pci_bus);
472 /* Call the drivers for the new devices subordinate to PPB */
473 if (new_ppb)
474 pci_bus_add_devices(new_bus);
475
476 mutex_unlock(&sn_hotplug_mutex);
477
478 if (rc == 0)
479 dev_dbg(&slot->pci_bus->self->dev,
480 "insert operation successful\n");
481 else
482 dev_dbg(&slot->pci_bus->self->dev,
483 "insert operation failed rc = %d\n", rc);
484
485 return rc;
486 }
487
disable_slot(struct hotplug_slot * bss_hotplug_slot)488 static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
489 {
490 struct slot *slot = bss_hotplug_slot->private;
491 struct pci_dev *dev;
492 int func;
493 int rc;
494 acpi_owner_id ssdt_id = 0;
495
496 /* Acquire update access to the bus */
497 mutex_lock(&sn_hotplug_mutex);
498
499 /* is it okay to bring this slot down? */
500 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
501 PCI_REQ_SLOT_ELIGIBLE);
502 if (rc)
503 goto leaving;
504
505 /* free the ACPI resources for the slot */
506 if (SN_ACPI_BASE_SUPPORT() &&
507 PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
508 unsigned long long adr;
509 struct acpi_device *device;
510 acpi_handle phandle;
511 acpi_handle chandle = NULL;
512 acpi_handle rethandle;
513 acpi_status ret;
514
515 /* Get the rootbus node pointer */
516 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
517
518 /*
519 * Walk the rootbus node's immediate children looking for
520 * the slot's device node(s). There can be more than
521 * one for multifunction devices.
522 */
523 for (;;) {
524 rethandle = NULL;
525 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
526 phandle, chandle,
527 &rethandle);
528
529 if (ret == AE_NOT_FOUND || rethandle == NULL)
530 break;
531
532 chandle = rethandle;
533
534 ret = acpi_evaluate_integer(chandle,
535 METHOD_NAME__ADR,
536 NULL, &adr);
537 if (ACPI_SUCCESS(ret) &&
538 (adr>>16) == (slot->device_num + 1)) {
539 /* retain the owner id */
540 acpi_get_id(chandle, &ssdt_id);
541
542 ret = acpi_bus_get_device(chandle,
543 &device);
544 if (ACPI_SUCCESS(ret))
545 acpi_bus_trim(device, 1);
546 }
547 }
548
549 }
550
551 /* Free the SN resources assigned to the Linux device.*/
552 for (func = 0; func < 8; func++) {
553 dev = pci_get_slot(slot->pci_bus,
554 PCI_DEVFN(slot->device_num + 1,
555 PCI_FUNC(func)));
556 if (dev) {
557 sn_bus_free_data(dev);
558 pci_remove_bus_device(dev);
559 pci_dev_put(dev);
560 }
561 }
562
563 /* Remove the SSDT for the slot from the ACPI namespace */
564 if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
565 acpi_status ret;
566 ret = acpi_unload_table_id(ssdt_id);
567 if (ACPI_FAILURE(ret)) {
568 printk(KERN_ERR "%s: acpi_unload_table_id "
569 "failed (0x%x) for id %d\n",
570 __func__, ret, ssdt_id);
571 /* try to continue on */
572 }
573 }
574
575 /* free the collected sysdata pointers */
576 sn_bus_free_sysdata();
577
578 /* Deactivate slot */
579 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
580 PCI_REQ_SLOT_DISABLE);
581 leaving:
582 /* Release the bus lock */
583 mutex_unlock(&sn_hotplug_mutex);
584
585 return rc;
586 }
587
get_power_status(struct hotplug_slot * bss_hotplug_slot,u8 * value)588 static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
589 u8 *value)
590 {
591 struct slot *slot = bss_hotplug_slot->private;
592 struct pcibus_info *pcibus_info;
593 u32 power;
594
595 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
596 mutex_lock(&sn_hotplug_mutex);
597 power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
598 *value = power ? 1 : 0;
599 mutex_unlock(&sn_hotplug_mutex);
600 return 0;
601 }
602
sn_release_slot(struct hotplug_slot * bss_hotplug_slot)603 static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
604 {
605 kfree(bss_hotplug_slot->info);
606 kfree(bss_hotplug_slot->private);
607 kfree(bss_hotplug_slot);
608 }
609
sn_hotplug_slot_register(struct pci_bus * pci_bus)610 static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
611 {
612 int device;
613 struct pci_slot *pci_slot;
614 struct hotplug_slot *bss_hotplug_slot;
615 char name[SN_SLOT_NAME_SIZE];
616 int rc = 0;
617
618 /*
619 * Currently only four devices are supported,
620 * in the future there maybe more -- up to 32.
621 */
622
623 for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
624 if (sn_pci_slot_valid(pci_bus, device) != 1)
625 continue;
626
627 bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
628 GFP_KERNEL);
629 if (!bss_hotplug_slot) {
630 rc = -ENOMEM;
631 goto alloc_err;
632 }
633
634 bss_hotplug_slot->info =
635 kzalloc(sizeof(struct hotplug_slot_info),
636 GFP_KERNEL);
637 if (!bss_hotplug_slot->info) {
638 rc = -ENOMEM;
639 goto alloc_err;
640 }
641
642 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
643 pci_bus, device, name)) {
644 rc = -ENOMEM;
645 goto alloc_err;
646 }
647 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
648 bss_hotplug_slot->release = &sn_release_slot;
649
650 rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
651 if (rc)
652 goto register_err;
653
654 pci_slot = bss_hotplug_slot->pci_slot;
655 rc = sysfs_create_file(&pci_slot->kobj,
656 &sn_slot_path_attr.attr);
657 if (rc)
658 goto register_err;
659 }
660 dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
661 return rc;
662
663 register_err:
664 dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
665 rc);
666
667 alloc_err:
668 if (rc == -ENOMEM)
669 dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
670
671 /* destroy THIS element */
672 if (bss_hotplug_slot)
673 sn_release_slot(bss_hotplug_slot);
674
675 /* destroy anything else on the list */
676 while ((bss_hotplug_slot = sn_hp_destroy()))
677 pci_hp_deregister(bss_hotplug_slot);
678
679 return rc;
680 }
681
sn_pci_hotplug_init(void)682 static int sn_pci_hotplug_init(void)
683 {
684 struct pci_bus *pci_bus = NULL;
685 int rc;
686 int registered = 0;
687
688 if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
689 printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
690 __func__);
691 return -EPERM;
692 }
693
694 INIT_LIST_HEAD(&sn_hp_list);
695
696 while ((pci_bus = pci_find_next_bus(pci_bus))) {
697 if (!pci_bus->sysdata)
698 continue;
699
700 rc = sn_pci_bus_valid(pci_bus);
701 if (rc != 1) {
702 dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
703 continue;
704 }
705 dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
706
707 rc = sn_hotplug_slot_register(pci_bus);
708 if (!rc) {
709 registered = 1;
710 } else {
711 registered = 0;
712 break;
713 }
714 }
715
716 return registered == 1 ? 0 : -ENODEV;
717 }
718
sn_pci_hotplug_exit(void)719 static void sn_pci_hotplug_exit(void)
720 {
721 struct hotplug_slot *bss_hotplug_slot;
722
723 while ((bss_hotplug_slot = sn_hp_destroy()))
724 pci_hp_deregister(bss_hotplug_slot);
725
726 if (!list_empty(&sn_hp_list))
727 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
728 }
729
730 module_init(sn_pci_hotplug_init);
731 module_exit(sn_pci_hotplug_exit);
732