1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ISM driver for s390.
4 *
5 * Copyright IBM Corp. 2018
6 */
7#define pr_fmt(fmt) "ism: " fmt
8
9#include <linux/export.h>
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/interrupt.h>
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/ctype.h>
16#include <linux/processor.h>
17
18#include "ism.h"
19
20MODULE_DESCRIPTION("ISM driver for s390");
21MODULE_LICENSE("GPL");
22
23#define DRV_NAME "ism"
24
25static const struct pci_device_id ism_device_table[] = {
26 { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 },
27 { 0, }
28};
29MODULE_DEVICE_TABLE(pci, ism_device_table);
30
31static debug_info_t *ism_debug_info;
32
33static int ism_cmd(struct ism_dev *ism, void *cmd)
34{
35 struct ism_req_hdr *req = cmd;
36 struct ism_resp_hdr *resp = cmd;
37
38 spin_lock(lock: &ism->cmd_lock);
39 __ism_write_cmd(ism, data: req + 1, offset: sizeof(*req), len: req->len - sizeof(*req));
40 __ism_write_cmd(ism, data: req, offset: 0, len: sizeof(*req));
41
42 WRITE_ONCE(resp->ret, ISM_ERROR);
43
44 __ism_read_cmd(ism, data: resp, offset: 0, len: sizeof(*resp));
45 if (resp->ret) {
46 debug_text_event(ism_debug_info, 0, "cmd failure");
47 debug_event(ism_debug_info, 0, resp, sizeof(*resp));
48 goto out;
49 }
50 __ism_read_cmd(ism, data: resp + 1, offset: sizeof(*resp), len: resp->len - sizeof(*resp));
51out:
52 spin_unlock(lock: &ism->cmd_lock);
53 return resp->ret;
54}
55
56static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code)
57{
58 union ism_cmd_simple cmd;
59
60 memset(&cmd, 0, sizeof(cmd));
61 cmd.request.hdr.cmd = cmd_code;
62 cmd.request.hdr.len = sizeof(cmd.request);
63
64 return ism_cmd(ism, cmd: &cmd);
65}
66
67static int query_info(struct ism_dev *ism)
68{
69 union ism_qi cmd;
70
71 memset(&cmd, 0, sizeof(cmd));
72 cmd.request.hdr.cmd = ISM_QUERY_INFO;
73 cmd.request.hdr.len = sizeof(cmd.request);
74
75 if (ism_cmd(ism, cmd: &cmd))
76 goto out;
77
78 debug_text_event(ism_debug_info, 3, "query info");
79 debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response));
80out:
81 return 0;
82}
83
84static int register_sba(struct ism_dev *ism)
85{
86 union ism_reg_sba cmd;
87 dma_addr_t dma_handle;
88 struct ism_sba *sba;
89
90 sba = dma_alloc_coherent(dev: &ism->pdev->dev, PAGE_SIZE, dma_handle: &dma_handle,
91 GFP_KERNEL);
92 if (!sba)
93 return -ENOMEM;
94
95 memset(&cmd, 0, sizeof(cmd));
96 cmd.request.hdr.cmd = ISM_REG_SBA;
97 cmd.request.hdr.len = sizeof(cmd.request);
98 cmd.request.sba = dma_handle;
99
100 if (ism_cmd(ism, cmd: &cmd)) {
101 dma_free_coherent(dev: &ism->pdev->dev, PAGE_SIZE, cpu_addr: sba, dma_handle);
102 return -EIO;
103 }
104
105 ism->sba = sba;
106 ism->sba_dma_addr = dma_handle;
107
108 return 0;
109}
110
111static int register_ieq(struct ism_dev *ism)
112{
113 union ism_reg_ieq cmd;
114 dma_addr_t dma_handle;
115 struct ism_eq *ieq;
116
117 ieq = dma_alloc_coherent(dev: &ism->pdev->dev, PAGE_SIZE, dma_handle: &dma_handle,
118 GFP_KERNEL);
119 if (!ieq)
120 return -ENOMEM;
121
122 memset(&cmd, 0, sizeof(cmd));
123 cmd.request.hdr.cmd = ISM_REG_IEQ;
124 cmd.request.hdr.len = sizeof(cmd.request);
125 cmd.request.ieq = dma_handle;
126 cmd.request.len = sizeof(*ieq);
127
128 if (ism_cmd(ism, cmd: &cmd)) {
129 dma_free_coherent(dev: &ism->pdev->dev, PAGE_SIZE, cpu_addr: ieq, dma_handle);
130 return -EIO;
131 }
132
133 ism->ieq = ieq;
134 ism->ieq_idx = -1;
135 ism->ieq_dma_addr = dma_handle;
136
137 return 0;
138}
139
140static int unregister_sba(struct ism_dev *ism)
141{
142 int ret;
143
144 if (!ism->sba)
145 return 0;
146
147 ret = ism_cmd_simple(ism, ISM_UNREG_SBA);
148 if (ret && ret != ISM_ERROR)
149 return -EIO;
150
151 dma_free_coherent(dev: &ism->pdev->dev, PAGE_SIZE,
152 cpu_addr: ism->sba, dma_handle: ism->sba_dma_addr);
153
154 ism->sba = NULL;
155 ism->sba_dma_addr = 0;
156
157 return 0;
158}
159
160static int unregister_ieq(struct ism_dev *ism)
161{
162 int ret;
163
164 if (!ism->ieq)
165 return 0;
166
167 ret = ism_cmd_simple(ism, ISM_UNREG_IEQ);
168 if (ret && ret != ISM_ERROR)
169 return -EIO;
170
171 dma_free_coherent(dev: &ism->pdev->dev, PAGE_SIZE,
172 cpu_addr: ism->ieq, dma_handle: ism->ieq_dma_addr);
173
174 ism->ieq = NULL;
175 ism->ieq_dma_addr = 0;
176
177 return 0;
178}
179
180static int ism_read_local_gid(struct dibs_dev *dibs)
181{
182 struct ism_dev *ism = dibs->drv_priv;
183 union ism_read_gid cmd;
184 int ret;
185
186 memset(&cmd, 0, sizeof(cmd));
187 cmd.request.hdr.cmd = ISM_READ_GID;
188 cmd.request.hdr.len = sizeof(cmd.request);
189
190 ret = ism_cmd(ism, cmd: &cmd);
191 if (ret)
192 goto out;
193
194 memset(&dibs->gid, 0, sizeof(dibs->gid));
195 memcpy(&dibs->gid, &cmd.response.gid, sizeof(cmd.response.gid));
196out:
197 return ret;
198}
199
200static int ism_query_rgid(struct dibs_dev *dibs, const uuid_t *rgid,
201 u32 vid_valid, u32 vid)
202{
203 struct ism_dev *ism = dibs->drv_priv;
204 union ism_query_rgid cmd;
205
206 memset(&cmd, 0, sizeof(cmd));
207 cmd.request.hdr.cmd = ISM_QUERY_RGID;
208 cmd.request.hdr.len = sizeof(cmd.request);
209
210 memcpy(&cmd.request.rgid, rgid, sizeof(cmd.request.rgid));
211 cmd.request.vlan_valid = vid_valid;
212 cmd.request.vlan_id = vid;
213
214 return ism_cmd(ism, cmd: &cmd);
215}
216
217static int ism_max_dmbs(void)
218{
219 return ISM_NR_DMBS;
220}
221
222static void ism_free_dmb(struct ism_dev *ism, struct dibs_dmb *dmb)
223{
224 clear_bit(nr: dmb->idx, addr: ism->sba_bitmap);
225 dma_unmap_page(&ism->pdev->dev, dmb->dma_addr, dmb->dmb_len,
226 DMA_FROM_DEVICE);
227 folio_put(folio: virt_to_folio(x: dmb->cpu_addr));
228}
229
230static int ism_alloc_dmb(struct ism_dev *ism, struct dibs_dmb *dmb)
231{
232 struct folio *folio;
233 unsigned long bit;
234 int rc;
235
236 if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(dev: &ism->pdev->dev))
237 return -EINVAL;
238
239 if (!dmb->idx) {
240 bit = find_next_zero_bit(addr: ism->sba_bitmap, ISM_NR_DMBS,
241 ISM_DMB_BIT_OFFSET);
242 if (bit == ISM_NR_DMBS)
243 return -ENOSPC;
244
245 dmb->idx = bit;
246 }
247 if (dmb->idx < ISM_DMB_BIT_OFFSET ||
248 test_and_set_bit(nr: dmb->idx, addr: ism->sba_bitmap))
249 return -EINVAL;
250
251 folio = folio_alloc(GFP_KERNEL | __GFP_NOWARN | __GFP_NOMEMALLOC |
252 __GFP_NORETRY, get_order(dmb->dmb_len));
253
254 if (!folio) {
255 rc = -ENOMEM;
256 goto out_bit;
257 }
258
259 dmb->cpu_addr = folio_address(folio);
260 dmb->dma_addr = dma_map_page(&ism->pdev->dev,
261 virt_to_page(dmb->cpu_addr), 0,
262 dmb->dmb_len, DMA_FROM_DEVICE);
263 if (dma_mapping_error(dev: &ism->pdev->dev, dma_addr: dmb->dma_addr)) {
264 rc = -ENOMEM;
265 goto out_free;
266 }
267
268 return 0;
269
270out_free:
271 kfree(objp: dmb->cpu_addr);
272out_bit:
273 clear_bit(nr: dmb->idx, addr: ism->sba_bitmap);
274 return rc;
275}
276
277static int ism_register_dmb(struct dibs_dev *dibs, struct dibs_dmb *dmb,
278 struct dibs_client *client)
279{
280 struct ism_dev *ism = dibs->drv_priv;
281 union ism_reg_dmb cmd;
282 unsigned long flags;
283 int ret;
284
285 ret = ism_alloc_dmb(ism, dmb);
286 if (ret)
287 goto out;
288
289 memset(&cmd, 0, sizeof(cmd));
290 cmd.request.hdr.cmd = ISM_REG_DMB;
291 cmd.request.hdr.len = sizeof(cmd.request);
292
293 cmd.request.dmb = dmb->dma_addr;
294 cmd.request.dmb_len = dmb->dmb_len;
295 cmd.request.sba_idx = dmb->idx;
296 cmd.request.vlan_valid = dmb->vlan_valid;
297 cmd.request.vlan_id = dmb->vlan_id;
298 memcpy(&cmd.request.rgid, &dmb->rgid, sizeof(u64));
299
300 ret = ism_cmd(ism, cmd: &cmd);
301 if (ret) {
302 ism_free_dmb(ism, dmb);
303 goto out;
304 }
305 dmb->dmb_tok = cmd.response.dmb_tok;
306 spin_lock_irqsave(&dibs->lock, flags);
307 dibs->dmb_clientid_arr[dmb->idx - ISM_DMB_BIT_OFFSET] = client->id;
308 spin_unlock_irqrestore(lock: &dibs->lock, flags);
309out:
310 return ret;
311}
312
313static int ism_unregister_dmb(struct dibs_dev *dibs, struct dibs_dmb *dmb)
314{
315 struct ism_dev *ism = dibs->drv_priv;
316 union ism_unreg_dmb cmd;
317 unsigned long flags;
318 int ret;
319
320 memset(&cmd, 0, sizeof(cmd));
321 cmd.request.hdr.cmd = ISM_UNREG_DMB;
322 cmd.request.hdr.len = sizeof(cmd.request);
323
324 cmd.request.dmb_tok = dmb->dmb_tok;
325
326 spin_lock_irqsave(&dibs->lock, flags);
327 dibs->dmb_clientid_arr[dmb->idx - ISM_DMB_BIT_OFFSET] = NO_DIBS_CLIENT;
328 spin_unlock_irqrestore(lock: &dibs->lock, flags);
329
330 ret = ism_cmd(ism, cmd: &cmd);
331 if (ret && ret != ISM_ERROR)
332 goto out;
333
334 ism_free_dmb(ism, dmb);
335out:
336 return ret;
337}
338
339static int ism_add_vlan_id(struct dibs_dev *dibs, u64 vlan_id)
340{
341 struct ism_dev *ism = dibs->drv_priv;
342 union ism_set_vlan_id cmd;
343
344 memset(&cmd, 0, sizeof(cmd));
345 cmd.request.hdr.cmd = ISM_ADD_VLAN_ID;
346 cmd.request.hdr.len = sizeof(cmd.request);
347
348 cmd.request.vlan_id = vlan_id;
349
350 return ism_cmd(ism, cmd: &cmd);
351}
352
353static int ism_del_vlan_id(struct dibs_dev *dibs, u64 vlan_id)
354{
355 struct ism_dev *ism = dibs->drv_priv;
356 union ism_set_vlan_id cmd;
357
358 memset(&cmd, 0, sizeof(cmd));
359 cmd.request.hdr.cmd = ISM_DEL_VLAN_ID;
360 cmd.request.hdr.len = sizeof(cmd.request);
361
362 cmd.request.vlan_id = vlan_id;
363
364 return ism_cmd(ism, cmd: &cmd);
365}
366
367static int ism_signal_ieq(struct dibs_dev *dibs, const uuid_t *rgid,
368 u32 trigger_irq, u32 event_code, u64 info)
369{
370 struct ism_dev *ism = dibs->drv_priv;
371 union ism_sig_ieq cmd;
372
373 memset(&cmd, 0, sizeof(cmd));
374 cmd.request.hdr.cmd = ISM_SIGNAL_IEQ;
375 cmd.request.hdr.len = sizeof(cmd.request);
376
377 memcpy(&cmd.request.rgid, rgid, sizeof(cmd.request.rgid));
378 cmd.request.trigger_irq = trigger_irq;
379 cmd.request.event_code = event_code;
380 cmd.request.info = info;
381
382 return ism_cmd(ism, cmd: &cmd);
383}
384
385static unsigned int max_bytes(unsigned int start, unsigned int len,
386 unsigned int boundary)
387{
388 return min(boundary - (start & (boundary - 1)), len);
389}
390
391static int ism_move(struct dibs_dev *dibs, u64 dmb_tok, unsigned int idx,
392 bool sf, unsigned int offset, void *data,
393 unsigned int size)
394{
395 struct ism_dev *ism = dibs->drv_priv;
396 unsigned int bytes;
397 u64 dmb_req;
398 int ret;
399
400 while (size) {
401 bytes = max_bytes(start: offset, len: size, PAGE_SIZE);
402 dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0,
403 offset);
404
405 ret = __ism_move(ism, dmb_req, data, size: bytes);
406 if (ret)
407 return ret;
408
409 size -= bytes;
410 data += bytes;
411 offset += bytes;
412 }
413
414 return 0;
415}
416
417static u16 ism_get_chid(struct dibs_dev *dibs)
418{
419 struct ism_dev *ism = dibs->drv_priv;
420
421 if (!ism || !ism->pdev)
422 return 0;
423
424 return to_zpci(ism->pdev)->pchid;
425}
426
427static int ism_match_event_type(u32 s390_event_type)
428{
429 switch (s390_event_type) {
430 case ISM_EVENT_BUF:
431 return DIBS_BUF_EVENT;
432 case ISM_EVENT_DEV:
433 return DIBS_DEV_EVENT;
434 case ISM_EVENT_SWR:
435 return DIBS_SW_EVENT;
436 default:
437 return DIBS_OTHER_TYPE;
438 }
439}
440
441static int ism_match_event_subtype(u32 s390_event_subtype)
442{
443 switch (s390_event_subtype) {
444 case ISM_BUF_DMB_UNREGISTERED:
445 return DIBS_BUF_UNREGISTERED;
446 case ISM_DEV_GID_DISABLED:
447 return DIBS_DEV_DISABLED;
448 case ISM_DEV_GID_ERR_STATE:
449 return DIBS_DEV_ERR_STATE;
450 default:
451 return DIBS_OTHER_SUBTYPE;
452 }
453}
454
455static void ism_handle_event(struct ism_dev *ism)
456{
457 struct dibs_dev *dibs = ism->dibs;
458 struct dibs_event event;
459 struct ism_event *entry;
460 struct dibs_client *clt;
461 int i;
462
463 while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) {
464 if (++ism->ieq_idx == ARRAY_SIZE(ism->ieq->entry))
465 ism->ieq_idx = 0;
466
467 entry = &ism->ieq->entry[ism->ieq_idx];
468 debug_event(ism_debug_info, 2, entry, sizeof(*entry));
469 __memset(s: &event, c: 0, n: sizeof(event));
470 event.type = ism_match_event_type(s390_event_type: entry->type);
471 if (event.type == DIBS_SW_EVENT)
472 event.subtype = entry->code;
473 else
474 event.subtype = ism_match_event_subtype(s390_event_subtype: entry->code);
475 event.time = entry->time;
476 event.data = entry->info;
477 switch (event.type) {
478 case DIBS_BUF_EVENT:
479 event.buffer_tok = entry->tok;
480 break;
481 case DIBS_DEV_EVENT:
482 case DIBS_SW_EVENT:
483 memcpy(&event.gid, &entry->tok, sizeof(u64));
484 }
485 for (i = 0; i < MAX_DIBS_CLIENTS; ++i) {
486 clt = dibs->subs[i];
487 if (clt)
488 clt->ops->handle_event(dibs, &event);
489 }
490 }
491}
492
493static irqreturn_t ism_handle_irq(int irq, void *data)
494{
495 struct ism_dev *ism = data;
496 unsigned long bit, end;
497 struct dibs_dev *dibs;
498 unsigned long *bv;
499 u16 dmbemask;
500 u8 client_id;
501
502 dibs = ism->dibs;
503
504 bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET];
505 end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET;
506
507 spin_lock(lock: &dibs->lock);
508 ism->sba->s = 0;
509 barrier();
510 for (bit = 0;;) {
511 bit = find_next_bit_inv(bv, end, bit);
512 if (bit >= end)
513 break;
514
515 clear_bit_inv(bit, bv);
516 dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET];
517 ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
518 barrier();
519 client_id = dibs->dmb_clientid_arr[bit];
520 if (unlikely(client_id == NO_DIBS_CLIENT ||
521 !dibs->subs[client_id]))
522 continue;
523 dibs->subs[client_id]->ops->handle_irq(dibs,
524 bit + ISM_DMB_BIT_OFFSET,
525 dmbemask);
526 }
527
528 if (ism->sba->e) {
529 ism->sba->e = 0;
530 barrier();
531 ism_handle_event(ism);
532 }
533 spin_unlock(lock: &dibs->lock);
534 return IRQ_HANDLED;
535}
536
537static const struct dibs_dev_ops ism_ops = {
538 .get_fabric_id = ism_get_chid,
539 .query_remote_gid = ism_query_rgid,
540 .max_dmbs = ism_max_dmbs,
541 .register_dmb = ism_register_dmb,
542 .unregister_dmb = ism_unregister_dmb,
543 .move_data = ism_move,
544 .add_vlan_id = ism_add_vlan_id,
545 .del_vlan_id = ism_del_vlan_id,
546 .signal_event = ism_signal_ieq,
547};
548
549static int ism_dev_init(struct ism_dev *ism)
550{
551 struct pci_dev *pdev = ism->pdev;
552 int ret;
553
554 ret = pci_alloc_irq_vectors(dev: pdev, min_vecs: 1, max_vecs: 1, PCI_IRQ_MSI);
555 if (ret <= 0)
556 goto out;
557
558 ret = request_irq(irq: pci_irq_vector(dev: pdev, nr: 0), handler: ism_handle_irq, flags: 0,
559 name: pci_name(pdev), dev: ism);
560 if (ret)
561 goto free_vectors;
562
563 ret = register_sba(ism);
564 if (ret)
565 goto free_irq;
566
567 ret = register_ieq(ism);
568 if (ret)
569 goto unreg_sba;
570
571 query_info(ism);
572 return 0;
573
574unreg_sba:
575 unregister_sba(ism);
576free_irq:
577 free_irq(pci_irq_vector(dev: pdev, nr: 0), ism);
578free_vectors:
579 pci_free_irq_vectors(dev: pdev);
580out:
581 return ret;
582}
583
584static void ism_dev_exit(struct ism_dev *ism)
585{
586 struct pci_dev *pdev = ism->pdev;
587
588 unregister_ieq(ism);
589 unregister_sba(ism);
590 free_irq(pci_irq_vector(dev: pdev, nr: 0), ism);
591 pci_free_irq_vectors(dev: pdev);
592}
593
594static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
595{
596 struct dibs_dev *dibs;
597 struct zpci_dev *zdev;
598 struct ism_dev *ism;
599 int ret;
600
601 ism = kzalloc(sizeof(*ism), GFP_KERNEL);
602 if (!ism)
603 return -ENOMEM;
604
605 spin_lock_init(&ism->cmd_lock);
606 dev_set_drvdata(dev: &pdev->dev, data: ism);
607 ism->pdev = pdev;
608
609 ret = pci_enable_device_mem(dev: pdev);
610 if (ret)
611 goto err_dev;
612
613 ret = pci_request_mem_regions(pdev, DRV_NAME);
614 if (ret)
615 goto err_disable;
616
617 ret = dma_set_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(64));
618 if (ret)
619 goto err_resource;
620
621 dma_set_seg_boundary(dev: &pdev->dev, SZ_1M - 1);
622 dma_set_max_seg_size(dev: &pdev->dev, SZ_1M);
623 pci_set_master(dev: pdev);
624
625 dibs = dibs_dev_alloc();
626 if (!dibs) {
627 ret = -ENOMEM;
628 goto err_resource;
629 }
630 /* set this up before we enable interrupts */
631 ism->dibs = dibs;
632 dibs->drv_priv = ism;
633 dibs->ops = &ism_ops;
634
635 /* enable ism device, but any interrupts and events will be ignored
636 * before dibs_dev_add() adds it to any clients.
637 */
638 ret = ism_dev_init(ism);
639 if (ret)
640 goto err_dibs;
641
642 /* after ism_dev_init() we can call ism function to set gid */
643 ret = ism_read_local_gid(dibs);
644 if (ret)
645 goto err_ism;
646
647 dibs->dev.parent = &pdev->dev;
648
649 zdev = to_zpci(pdev);
650 dev_set_name(dev: &dibs->dev, name: "ism%x", zdev->uid ? zdev->uid : zdev->fid);
651
652 ret = dibs_dev_add(dibs);
653 if (ret)
654 goto err_ism;
655
656 return 0;
657
658err_ism:
659 ism_dev_exit(ism);
660err_dibs:
661 /* pairs with dibs_dev_alloc() */
662 put_device(dev: &dibs->dev);
663err_resource:
664 pci_release_mem_regions(pdev);
665err_disable:
666 pci_disable_device(dev: pdev);
667err_dev:
668 dev_set_drvdata(dev: &pdev->dev, NULL);
669 kfree(objp: ism);
670
671 return ret;
672}
673
674static void ism_remove(struct pci_dev *pdev)
675{
676 struct ism_dev *ism = dev_get_drvdata(dev: &pdev->dev);
677 struct dibs_dev *dibs = ism->dibs;
678
679 dibs_dev_del(dibs);
680 ism_dev_exit(ism);
681 /* pairs with dibs_dev_alloc() */
682 put_device(dev: &dibs->dev);
683
684 pci_release_mem_regions(pdev);
685 pci_disable_device(dev: pdev);
686 dev_set_drvdata(dev: &pdev->dev, NULL);
687 kfree(objp: ism);
688}
689
690static struct pci_driver ism_driver = {
691 .name = DRV_NAME,
692 .id_table = ism_device_table,
693 .probe = ism_probe,
694 .remove = ism_remove,
695};
696
697static int __init ism_init(void)
698{
699 int ret;
700
701 ism_debug_info = debug_register("ism", 2, 1, 16);
702 if (!ism_debug_info)
703 return -ENODEV;
704
705 debug_register_view(ism_debug_info, &debug_hex_ascii_view);
706 ret = pci_register_driver(&ism_driver);
707 if (ret)
708 debug_unregister(ism_debug_info);
709
710 return ret;
711}
712
713static void __exit ism_exit(void)
714{
715 pci_unregister_driver(dev: &ism_driver);
716 debug_unregister(ism_debug_info);
717}
718
719module_init(ism_init);
720module_exit(ism_exit);
721

source code of linux/drivers/s390/net/ism_drv.c