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/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
37 MODULE_LICENSE("GPL");
38 MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
39 MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
40
41
42 /* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */
43 #define PCI_SLOT_ALREADY_UP 2 /* slot already up */
44 #define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
45 #define PCI_L1_ERR 7 /* L1 console command error */
46 #define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
47
48
49 #define PCIIO_ASIC_TYPE_TIOCA 4
50 #define PCI_L1_QSIZE 128 /* our L1 message buffer size */
51 #define SN_MAX_HP_SLOTS 32 /* max hotplug slots */
52 #define SN_SLOT_NAME_SIZE 33 /* size of name string */
53
54 /* internal list head */
55 static struct list_head sn_hp_list;
56
57 /* hotplug_slot struct's private pointer */
58 struct slot {
59 int device_num;
60 struct pci_bus *pci_bus;
61 /* this struct for glue internal only */
62 struct hotplug_slot *hotplug_slot;
63 struct list_head hp_list;
64 char physical_path[SN_SLOT_NAME_SIZE];
65 };
66
67 struct pcibr_slot_enable_resp {
68 int resp_sub_errno;
69 char resp_l1_msg[PCI_L1_QSIZE + 1];
70 };
71
72 struct pcibr_slot_disable_resp {
73 int resp_sub_errno;
74 char resp_l1_msg[PCI_L1_QSIZE + 1];
75 };
76
77 enum sn_pci_req_e {
78 PCI_REQ_SLOT_ELIGIBLE,
79 PCI_REQ_SLOT_DISABLE
80 };
81
82 static int enable_slot(struct hotplug_slot *slot);
83 static int disable_slot(struct hotplug_slot *slot);
84 static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
85
86 static 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
92 static DEFINE_MUTEX(sn_hotplug_mutex);
93
path_show(struct pci_slot * pci_slot,char * buf)94 static 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
106 static struct pci_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
107
sn_pci_slot_valid(struct pci_bus * pci_bus,int device)108 static 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 /* Check to see if this is a valid slot on 'pci_bus' */
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 /* Do not allow hotplug operations on base I/O cards */
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
sn_pci_bus_valid(struct pci_bus * pci_bus)132 static 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 /* Don't register slots hanging off the TIOCA bus */
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 /* Only register slots in I/O Bricks that support hotplug */
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
sn_hp_slot_private_alloc(struct hotplug_slot * bss_hotplug_slot,struct pci_bus * pci_bus,int device,char * name)162 static 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
sn_hp_destroy(void)191 static 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
sn_bus_free_data(struct pci_dev * dev)209 static void sn_bus_free_data(struct pci_dev *dev)
210 {
211 struct pci_bus *subordinate_bus;
212 struct pci_dev *child;
213
214 /* Recursively clean up sn_irq_info structs */
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 * Some drivers may use dma accesses during the
222 * driver remove function. We release the sysdata
223 * areas after the driver remove functions have
224 * been called.
225 */
226 sn_bus_store_sysdata(dev);
227 sn_pci_unfixup_slot(dev);
228 }
229
sn_slot_enable(struct hotplug_slot * bss_hotplug_slot,int device_num,char ** ssdt)230 static 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 * Power-on and initialize the slot in the SN
242 * PCI infrastructure.
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; /* return 1 to user */
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
sn_slot_disable(struct hotplug_slot * bss_hotplug_slot,int device_num,int action)272 static 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; /* return 1 to user */
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 * Power up and configure the slot via a SAL call to PROM.
329 * Scan slot (and any children), do any platform specific fixup,
330 * and find device driver.
331 */
enable_slot(struct hotplug_slot * bss_hotplug_slot)332 static 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 func, 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 /* Serialize the Linux PCI infrastructure */
344 mutex_lock(&sn_hotplug_mutex);
345
346 /*
347 * Power-on and initialize the slot in the SN
348 * PCI infrastructure. Also, retrieve the ACPI SSDT
349 * table for the slot (if ACPI capable PROM).
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 /* Add the new SSDT for the slot to the ACPI namespace */
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 /* try to continue on */
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 * Map SN resources for all functions on the card
381 * to the Linux PCI interface and tell the drivers
382 * about them.
383 */
384 for (func = 0; func < num_funcs; func++) {
385 dev = pci_get_slot(slot->pci_bus,
386 PCI_DEVFN(slot->device_num + 1,
387 PCI_FUNC(func)));
388 if (dev) {
389 /* Need to do slot fixup on PPB before fixup of children
390 * (PPB's pcidev_info needs to be in pcidev_info list
391 * before child's SN_PCIDEV_INFO() call to setup
392 * pdi_host_pcidev_info).
393 */
394 pcibios_fixup_device_resources(dev);
395 if (SN_ACPI_BASE_SUPPORT())
396 sn_acpi_slot_fixup(dev);
397 else
398 sn_io_slot_fixup(dev);
399 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
400 unsigned char sec_bus;
401 pci_read_config_byte(dev, PCI_SECONDARY_BUS,
402 &sec_bus);
403 new_bus = pci_add_new_bus(dev->bus, dev,
404 sec_bus);
405 pci_scan_child_bus(new_bus);
406 new_ppb = 1;
407 }
408 pci_dev_put(dev);
409 }
410 }
411
412 /*
413 * Add the slot's devices to the ACPI infrastructure */
414 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
415 unsigned long long adr;
416 struct acpi_device *pdevice;
417 struct acpi_device *device;
418 acpi_handle phandle;
419 acpi_handle chandle = NULL;
420 acpi_handle rethandle;
421 acpi_status ret;
422
423 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
424
425 if (acpi_bus_get_device(phandle, &pdevice)) {
426 dev_dbg(&slot->pci_bus->self->dev,
427 "no parent device, assuming NULL\n");
428 pdevice = NULL;
429 }
430
431 /*
432 * Walk the rootbus node's immediate children looking for
433 * the slot's device node(s). There can be more than
434 * one for multifunction devices.
435 */
436 for (;;) {
437 rethandle = NULL;
438 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
439 phandle, chandle,
440 &rethandle);
441
442 if (ret == AE_NOT_FOUND || rethandle == NULL)
443 break;
444
445 chandle = rethandle;
446
447 ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
448 NULL, &adr);
449
450 if (ACPI_SUCCESS(ret) &&
451 (adr>>16) == (slot->device_num + 1)) {
452
453 ret = acpi_bus_add(&device, pdevice, chandle,
454 ACPI_BUS_TYPE_DEVICE);
455 if (ACPI_FAILURE(ret)) {
456 printk(KERN_ERR "%s: acpi_bus_add "
457 "failed (0x%x) for slot %d "
458 "func %d\n", __func__,
459 ret, (int)(adr>>16),
460 (int)(adr&0xffff));
461 /* try to continue on */
462 } else {
463 acpi_bus_start(device);
464 }
465 }
466 }
467 }
468
469 /* Call the driver for the new device */
470 pci_bus_add_devices(slot->pci_bus);
471 /* Call the drivers for the new devices subordinate to PPB */
472 if (new_ppb)
473 pci_bus_add_devices(new_bus);
474
475 mutex_unlock(&sn_hotplug_mutex);
476
477 if (rc == 0)
478 dev_dbg(&slot->pci_bus->self->dev,
479 "insert operation successful\n");
480 else
481 dev_dbg(&slot->pci_bus->self->dev,
482 "insert operation failed rc = %d\n", rc);
483
484 return rc;
485 }
486
disable_slot(struct hotplug_slot * bss_hotplug_slot)487 static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
488 {
489 struct slot *slot = bss_hotplug_slot->private;
490 struct pci_dev *dev;
491 int func;
492 int rc;
493 acpi_owner_id ssdt_id = 0;
494
495 /* Acquire update access to the bus */
496 mutex_lock(&sn_hotplug_mutex);
497
498 /* is it okay to bring this slot down? */
499 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
500 PCI_REQ_SLOT_ELIGIBLE);
501 if (rc)
502 goto leaving;
503
504 /* free the ACPI resources for the slot */
505 if (SN_ACPI_BASE_SUPPORT() &&
506 PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
507 unsigned long long adr;
508 struct acpi_device *device;
509 acpi_handle phandle;
510 acpi_handle chandle = NULL;
511 acpi_handle rethandle;
512 acpi_status ret;
513
514 /* Get the rootbus node pointer */
515 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
516
517 /*
518 * Walk the rootbus node's immediate children looking for
519 * the slot's device node(s). There can be more than
520 * one for multifunction devices.
521 */
522 for (;;) {
523 rethandle = NULL;
524 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
525 phandle, chandle,
526 &rethandle);
527
528 if (ret == AE_NOT_FOUND || rethandle == NULL)
529 break;
530
531 chandle = rethandle;
532
533 ret = acpi_evaluate_integer(chandle,
534 METHOD_NAME__ADR,
535 NULL, &adr);
536 if (ACPI_SUCCESS(ret) &&
537 (adr>>16) == (slot->device_num + 1)) {
538 /* retain the owner id */
539 acpi_get_id(chandle, &ssdt_id);
540
541 ret = acpi_bus_get_device(chandle,
542 &device);
543 if (ACPI_SUCCESS(ret))
544 acpi_bus_trim(device, 1);
545 }
546 }
547
548 }
549
550 /* Free the SN resources assigned to the Linux device.*/
551 for (func = 0; func < 8; func++) {
552 dev = pci_get_slot(slot->pci_bus,
553 PCI_DEVFN(slot->device_num + 1,
554 PCI_FUNC(func)));
555 if (dev) {
556 sn_bus_free_data(dev);
557 pci_remove_bus_device(dev);
558 pci_dev_put(dev);
559 }
560 }
561
562 /* Remove the SSDT for the slot from the ACPI namespace */
563 if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
564 acpi_status ret;
565 ret = acpi_unload_table_id(ssdt_id);
566 if (ACPI_FAILURE(ret)) {
567 printk(KERN_ERR "%s: acpi_unload_table_id "
568 "failed (0x%x) for id %d\n",
569 __func__, ret, ssdt_id);
570 /* try to continue on */
571 }
572 }
573
574 /* free the collected sysdata pointers */
575 sn_bus_free_sysdata();
576
577 /* Deactivate slot */
578 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
579 PCI_REQ_SLOT_DISABLE);
580 leaving:
581 /* Release the bus lock */
582 mutex_unlock(&sn_hotplug_mutex);
583
584 return rc;
585 }
586
get_power_status(struct hotplug_slot * bss_hotplug_slot,u8 * value)587 static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
588 u8 *value)
589 {
590 struct slot *slot = bss_hotplug_slot->private;
591 struct pcibus_info *pcibus_info;
592 u32 power;
593
594 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
595 mutex_lock(&sn_hotplug_mutex);
596 power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
597 *value = power ? 1 : 0;
598 mutex_unlock(&sn_hotplug_mutex);
599 return 0;
600 }
601
sn_release_slot(struct hotplug_slot * bss_hotplug_slot)602 static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
603 {
604 kfree(bss_hotplug_slot->info);
605 kfree(bss_hotplug_slot->private);
606 kfree(bss_hotplug_slot);
607 }
608
sn_hotplug_slot_register(struct pci_bus * pci_bus)609 static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
610 {
611 int device;
612 struct pci_slot *pci_slot;
613 struct hotplug_slot *bss_hotplug_slot;
614 char name[SN_SLOT_NAME_SIZE];
615 int rc = 0;
616
617 /*
618 * Currently only four devices are supported,
619 * in the future there maybe more -- up to 32.
620 */
621
622 for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
623 if (sn_pci_slot_valid(pci_bus, device) != 1)
624 continue;
625
626 bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
627 GFP_KERNEL);
628 if (!bss_hotplug_slot) {
629 rc = -ENOMEM;
630 goto alloc_err;
631 }
632
633 bss_hotplug_slot->info =
634 kzalloc(sizeof(struct hotplug_slot_info),
635 GFP_KERNEL);
636 if (!bss_hotplug_slot->info) {
637 rc = -ENOMEM;
638 goto alloc_err;
639 }
640
641 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
642 pci_bus, device, name)) {
643 rc = -ENOMEM;
644 goto alloc_err;
645 }
646 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
647 bss_hotplug_slot->release = &sn_release_slot;
648
649 rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
650 if (rc)
651 goto register_err;
652
653 pci_slot = bss_hotplug_slot->pci_slot;
654 rc = sysfs_create_file(&pci_slot->kobj,
655 &sn_slot_path_attr.attr);
656 if (rc)
657 goto register_err;
658 }
659 dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
660 return rc;
661
662 register_err:
663 dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
664 rc);
665
666 alloc_err:
667 if (rc == -ENOMEM)
668 dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
669
670 /* destroy THIS element */
671 if (bss_hotplug_slot)
672 sn_release_slot(bss_hotplug_slot);
673
674 /* destroy anything else on the list */
675 while ((bss_hotplug_slot = sn_hp_destroy()))
676 pci_hp_deregister(bss_hotplug_slot);
677
678 return rc;
679 }
680
sn_pci_hotplug_init(void)681 static int __init sn_pci_hotplug_init(void)
682 {
683 struct pci_bus *pci_bus = NULL;
684 int rc;
685 int registered = 0;
686
687 if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
688 printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
689 __func__);
690 return -EPERM;
691 }
692
693 INIT_LIST_HEAD(&sn_hp_list);
694
695 while ((pci_bus = pci_find_next_bus(pci_bus))) {
696 if (!pci_bus->sysdata)
697 continue;
698
699 rc = sn_pci_bus_valid(pci_bus);
700 if (rc != 1) {
701 dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
702 continue;
703 }
704 dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
705
706 rc = sn_hotplug_slot_register(pci_bus);
707 if (!rc) {
708 registered = 1;
709 } else {
710 registered = 0;
711 break;
712 }
713 }
714
715 return registered == 1 ? 0 : -ENODEV;
716 }
717
sn_pci_hotplug_exit(void)718 static void __exit sn_pci_hotplug_exit(void)
719 {
720 struct hotplug_slot *bss_hotplug_slot;
721
722 while ((bss_hotplug_slot = sn_hp_destroy()))
723 pci_hp_deregister(bss_hotplug_slot);
724
725 if (!list_empty(&sn_hp_list))
726 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
727 }
728
729 module_init(sn_pci_hotplug_init);
730 module_exit(sn_pci_hotplug_exit);
731