1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ISM driver for s390.
4 *
5 * Copyright IBM Corp. 2018
6 */
7 #define KMSG_COMPONENT "ism"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
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
20 MODULE_DESCRIPTION("ISM driver for s390");
21 MODULE_LICENSE("GPL");
22
23 #define PCI_DEVICE_ID_IBM_ISM 0x04ED
24 #define DRV_NAME "ism"
25
26 static const struct pci_device_id ism_device_table[] = {
27 { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 },
28 { 0, }
29 };
30 MODULE_DEVICE_TABLE(pci, ism_device_table);
31
32 static debug_info_t *ism_debug_info;
33
34 #define NO_CLIENT 0xff /* must be >= MAX_CLIENTS */
35 static struct ism_client *clients[MAX_CLIENTS]; /* use an array rather than */
36 /* a list for fast mapping */
37 static u8 max_client;
38 static DEFINE_MUTEX(clients_lock);
39 struct ism_dev_list {
40 struct list_head list;
41 struct mutex mutex; /* protects ism device list */
42 };
43
44 static struct ism_dev_list ism_dev_list = {
45 .list = LIST_HEAD_INIT(ism_dev_list.list),
46 .mutex = __MUTEX_INITIALIZER(ism_dev_list.mutex),
47 };
48
ism_setup_forwarding(struct ism_client * client,struct ism_dev * ism)49 static void ism_setup_forwarding(struct ism_client *client, struct ism_dev *ism)
50 {
51 unsigned long flags;
52
53 spin_lock_irqsave(&ism->lock, flags);
54 ism->subs[client->id] = client;
55 spin_unlock_irqrestore(&ism->lock, flags);
56 }
57
ism_register_client(struct ism_client * client)58 int ism_register_client(struct ism_client *client)
59 {
60 struct ism_dev *ism;
61 int i, rc = -ENOSPC;
62
63 mutex_lock(&ism_dev_list.mutex);
64 mutex_lock(&clients_lock);
65 for (i = 0; i < MAX_CLIENTS; ++i) {
66 if (!clients[i]) {
67 clients[i] = client;
68 client->id = i;
69 if (i == max_client)
70 max_client++;
71 rc = 0;
72 break;
73 }
74 }
75 mutex_unlock(&clients_lock);
76
77 if (i < MAX_CLIENTS) {
78 /* initialize with all devices that we got so far */
79 list_for_each_entry(ism, &ism_dev_list.list, list) {
80 ism->priv[i] = NULL;
81 client->add(ism);
82 ism_setup_forwarding(client, ism);
83 }
84 }
85 mutex_unlock(&ism_dev_list.mutex);
86
87 return rc;
88 }
89 EXPORT_SYMBOL_GPL(ism_register_client);
90
ism_unregister_client(struct ism_client * client)91 int ism_unregister_client(struct ism_client *client)
92 {
93 struct ism_dev *ism;
94 unsigned long flags;
95 int rc = 0;
96
97 mutex_lock(&ism_dev_list.mutex);
98 list_for_each_entry(ism, &ism_dev_list.list, list) {
99 spin_lock_irqsave(&ism->lock, flags);
100 /* Stop forwarding IRQs and events */
101 ism->subs[client->id] = NULL;
102 for (int i = 0; i < ISM_NR_DMBS; ++i) {
103 if (ism->sba_client_arr[i] == client->id) {
104 WARN(1, "%s: attempt to unregister '%s' with registered dmb(s)\n",
105 __func__, client->name);
106 rc = -EBUSY;
107 goto err_reg_dmb;
108 }
109 }
110 spin_unlock_irqrestore(&ism->lock, flags);
111 }
112 mutex_unlock(&ism_dev_list.mutex);
113
114 mutex_lock(&clients_lock);
115 clients[client->id] = NULL;
116 if (client->id + 1 == max_client)
117 max_client--;
118 mutex_unlock(&clients_lock);
119 return rc;
120
121 err_reg_dmb:
122 spin_unlock_irqrestore(&ism->lock, flags);
123 mutex_unlock(&ism_dev_list.mutex);
124 return rc;
125 }
126 EXPORT_SYMBOL_GPL(ism_unregister_client);
127
ism_cmd(struct ism_dev * ism,void * cmd)128 static int ism_cmd(struct ism_dev *ism, void *cmd)
129 {
130 struct ism_req_hdr *req = cmd;
131 struct ism_resp_hdr *resp = cmd;
132
133 __ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req));
134 __ism_write_cmd(ism, req, 0, sizeof(*req));
135
136 WRITE_ONCE(resp->ret, ISM_ERROR);
137
138 __ism_read_cmd(ism, resp, 0, sizeof(*resp));
139 if (resp->ret) {
140 debug_text_event(ism_debug_info, 0, "cmd failure");
141 debug_event(ism_debug_info, 0, resp, sizeof(*resp));
142 goto out;
143 }
144 __ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp));
145 out:
146 return resp->ret;
147 }
148
ism_cmd_simple(struct ism_dev * ism,u32 cmd_code)149 static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code)
150 {
151 union ism_cmd_simple cmd;
152
153 memset(&cmd, 0, sizeof(cmd));
154 cmd.request.hdr.cmd = cmd_code;
155 cmd.request.hdr.len = sizeof(cmd.request);
156
157 return ism_cmd(ism, &cmd);
158 }
159
query_info(struct ism_dev * ism)160 static int query_info(struct ism_dev *ism)
161 {
162 union ism_qi cmd;
163
164 memset(&cmd, 0, sizeof(cmd));
165 cmd.request.hdr.cmd = ISM_QUERY_INFO;
166 cmd.request.hdr.len = sizeof(cmd.request);
167
168 if (ism_cmd(ism, &cmd))
169 goto out;
170
171 debug_text_event(ism_debug_info, 3, "query info");
172 debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response));
173 out:
174 return 0;
175 }
176
register_sba(struct ism_dev * ism)177 static int register_sba(struct ism_dev *ism)
178 {
179 union ism_reg_sba cmd;
180 dma_addr_t dma_handle;
181 struct ism_sba *sba;
182
183 sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
184 GFP_KERNEL);
185 if (!sba)
186 return -ENOMEM;
187
188 memset(&cmd, 0, sizeof(cmd));
189 cmd.request.hdr.cmd = ISM_REG_SBA;
190 cmd.request.hdr.len = sizeof(cmd.request);
191 cmd.request.sba = dma_handle;
192
193 if (ism_cmd(ism, &cmd)) {
194 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle);
195 return -EIO;
196 }
197
198 ism->sba = sba;
199 ism->sba_dma_addr = dma_handle;
200
201 return 0;
202 }
203
register_ieq(struct ism_dev * ism)204 static int register_ieq(struct ism_dev *ism)
205 {
206 union ism_reg_ieq cmd;
207 dma_addr_t dma_handle;
208 struct ism_eq *ieq;
209
210 ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
211 GFP_KERNEL);
212 if (!ieq)
213 return -ENOMEM;
214
215 memset(&cmd, 0, sizeof(cmd));
216 cmd.request.hdr.cmd = ISM_REG_IEQ;
217 cmd.request.hdr.len = sizeof(cmd.request);
218 cmd.request.ieq = dma_handle;
219 cmd.request.len = sizeof(*ieq);
220
221 if (ism_cmd(ism, &cmd)) {
222 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle);
223 return -EIO;
224 }
225
226 ism->ieq = ieq;
227 ism->ieq_idx = -1;
228 ism->ieq_dma_addr = dma_handle;
229
230 return 0;
231 }
232
unregister_sba(struct ism_dev * ism)233 static int unregister_sba(struct ism_dev *ism)
234 {
235 int ret;
236
237 if (!ism->sba)
238 return 0;
239
240 ret = ism_cmd_simple(ism, ISM_UNREG_SBA);
241 if (ret && ret != ISM_ERROR)
242 return -EIO;
243
244 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
245 ism->sba, ism->sba_dma_addr);
246
247 ism->sba = NULL;
248 ism->sba_dma_addr = 0;
249
250 return 0;
251 }
252
unregister_ieq(struct ism_dev * ism)253 static int unregister_ieq(struct ism_dev *ism)
254 {
255 int ret;
256
257 if (!ism->ieq)
258 return 0;
259
260 ret = ism_cmd_simple(ism, ISM_UNREG_IEQ);
261 if (ret && ret != ISM_ERROR)
262 return -EIO;
263
264 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
265 ism->ieq, ism->ieq_dma_addr);
266
267 ism->ieq = NULL;
268 ism->ieq_dma_addr = 0;
269
270 return 0;
271 }
272
ism_read_local_gid(struct ism_dev * ism)273 static int ism_read_local_gid(struct ism_dev *ism)
274 {
275 union ism_read_gid cmd;
276 int ret;
277
278 memset(&cmd, 0, sizeof(cmd));
279 cmd.request.hdr.cmd = ISM_READ_GID;
280 cmd.request.hdr.len = sizeof(cmd.request);
281
282 ret = ism_cmd(ism, &cmd);
283 if (ret)
284 goto out;
285
286 ism->local_gid = cmd.response.gid;
287 out:
288 return ret;
289 }
290
ism_free_dmb(struct ism_dev * ism,struct ism_dmb * dmb)291 static void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
292 {
293 clear_bit(dmb->sba_idx, ism->sba_bitmap);
294 dma_unmap_page(&ism->pdev->dev, dmb->dma_addr, dmb->dmb_len,
295 DMA_FROM_DEVICE);
296 folio_put(virt_to_folio(dmb->cpu_addr));
297 }
298
ism_alloc_dmb(struct ism_dev * ism,struct ism_dmb * dmb)299 static int ism_alloc_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
300 {
301 struct folio *folio;
302 unsigned long bit;
303 int rc;
304
305 if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev))
306 return -EINVAL;
307
308 if (!dmb->sba_idx) {
309 bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS,
310 ISM_DMB_BIT_OFFSET);
311 if (bit == ISM_NR_DMBS)
312 return -ENOSPC;
313
314 dmb->sba_idx = bit;
315 }
316 if (dmb->sba_idx < ISM_DMB_BIT_OFFSET ||
317 test_and_set_bit(dmb->sba_idx, ism->sba_bitmap))
318 return -EINVAL;
319
320 folio = folio_alloc(GFP_KERNEL | __GFP_NOWARN | __GFP_NOMEMALLOC |
321 __GFP_NORETRY, get_order(dmb->dmb_len));
322
323 if (!folio) {
324 rc = -ENOMEM;
325 goto out_bit;
326 }
327
328 dmb->cpu_addr = folio_address(folio);
329 dmb->dma_addr = dma_map_page(&ism->pdev->dev,
330 virt_to_page(dmb->cpu_addr), 0,
331 dmb->dmb_len, DMA_FROM_DEVICE);
332 if (dma_mapping_error(&ism->pdev->dev, dmb->dma_addr)) {
333 rc = -ENOMEM;
334 goto out_free;
335 }
336
337 return 0;
338
339 out_free:
340 kfree(dmb->cpu_addr);
341 out_bit:
342 clear_bit(dmb->sba_idx, ism->sba_bitmap);
343 return rc;
344 }
345
ism_register_dmb(struct ism_dev * ism,struct ism_dmb * dmb,struct ism_client * client)346 int ism_register_dmb(struct ism_dev *ism, struct ism_dmb *dmb,
347 struct ism_client *client)
348 {
349 union ism_reg_dmb cmd;
350 unsigned long flags;
351 int ret;
352
353 ret = ism_alloc_dmb(ism, dmb);
354 if (ret)
355 goto out;
356
357 memset(&cmd, 0, sizeof(cmd));
358 cmd.request.hdr.cmd = ISM_REG_DMB;
359 cmd.request.hdr.len = sizeof(cmd.request);
360
361 cmd.request.dmb = dmb->dma_addr;
362 cmd.request.dmb_len = dmb->dmb_len;
363 cmd.request.sba_idx = dmb->sba_idx;
364 cmd.request.vlan_valid = dmb->vlan_valid;
365 cmd.request.vlan_id = dmb->vlan_id;
366 cmd.request.rgid = dmb->rgid;
367
368 ret = ism_cmd(ism, &cmd);
369 if (ret) {
370 ism_free_dmb(ism, dmb);
371 goto out;
372 }
373 dmb->dmb_tok = cmd.response.dmb_tok;
374 spin_lock_irqsave(&ism->lock, flags);
375 ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = client->id;
376 spin_unlock_irqrestore(&ism->lock, flags);
377 out:
378 return ret;
379 }
380 EXPORT_SYMBOL_GPL(ism_register_dmb);
381
ism_unregister_dmb(struct ism_dev * ism,struct ism_dmb * dmb)382 int ism_unregister_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
383 {
384 union ism_unreg_dmb cmd;
385 unsigned long flags;
386 int ret;
387
388 memset(&cmd, 0, sizeof(cmd));
389 cmd.request.hdr.cmd = ISM_UNREG_DMB;
390 cmd.request.hdr.len = sizeof(cmd.request);
391
392 cmd.request.dmb_tok = dmb->dmb_tok;
393
394 spin_lock_irqsave(&ism->lock, flags);
395 ism->sba_client_arr[dmb->sba_idx - ISM_DMB_BIT_OFFSET] = NO_CLIENT;
396 spin_unlock_irqrestore(&ism->lock, flags);
397
398 ret = ism_cmd(ism, &cmd);
399 if (ret && ret != ISM_ERROR)
400 goto out;
401
402 ism_free_dmb(ism, dmb);
403 out:
404 return ret;
405 }
406 EXPORT_SYMBOL_GPL(ism_unregister_dmb);
407
ism_add_vlan_id(struct ism_dev * ism,u64 vlan_id)408 static int ism_add_vlan_id(struct ism_dev *ism, u64 vlan_id)
409 {
410 union ism_set_vlan_id cmd;
411
412 memset(&cmd, 0, sizeof(cmd));
413 cmd.request.hdr.cmd = ISM_ADD_VLAN_ID;
414 cmd.request.hdr.len = sizeof(cmd.request);
415
416 cmd.request.vlan_id = vlan_id;
417
418 return ism_cmd(ism, &cmd);
419 }
420
ism_del_vlan_id(struct ism_dev * ism,u64 vlan_id)421 static int ism_del_vlan_id(struct ism_dev *ism, u64 vlan_id)
422 {
423 union ism_set_vlan_id cmd;
424
425 memset(&cmd, 0, sizeof(cmd));
426 cmd.request.hdr.cmd = ISM_DEL_VLAN_ID;
427 cmd.request.hdr.len = sizeof(cmd.request);
428
429 cmd.request.vlan_id = vlan_id;
430
431 return ism_cmd(ism, &cmd);
432 }
433
max_bytes(unsigned int start,unsigned int len,unsigned int boundary)434 static unsigned int max_bytes(unsigned int start, unsigned int len,
435 unsigned int boundary)
436 {
437 return min(boundary - (start & (boundary - 1)), len);
438 }
439
ism_move(struct ism_dev * ism,u64 dmb_tok,unsigned int idx,bool sf,unsigned int offset,void * data,unsigned int size)440 int ism_move(struct ism_dev *ism, u64 dmb_tok, unsigned int idx, bool sf,
441 unsigned int offset, void *data, unsigned int size)
442 {
443 unsigned int bytes;
444 u64 dmb_req;
445 int ret;
446
447 while (size) {
448 bytes = max_bytes(offset, size, PAGE_SIZE);
449 dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0,
450 offset);
451
452 ret = __ism_move(ism, dmb_req, data, bytes);
453 if (ret)
454 return ret;
455
456 size -= bytes;
457 data += bytes;
458 offset += bytes;
459 }
460
461 return 0;
462 }
463 EXPORT_SYMBOL_GPL(ism_move);
464
465 static struct ism_systemeid SYSTEM_EID = {
466 .seid_string = "IBM-SYSZ-ISMSEID00000000",
467 .serial_number = "0000",
468 .type = "0000",
469 };
470
ism_create_system_eid(void)471 static void ism_create_system_eid(void)
472 {
473 struct cpuid id;
474 u16 ident_tail;
475 char tmp[5];
476
477 get_cpu_id(&id);
478 ident_tail = (u16)(id.ident & ISM_IDENT_MASK);
479 snprintf(tmp, 5, "%04X", ident_tail);
480 memcpy(&SYSTEM_EID.serial_number, tmp, 4);
481 snprintf(tmp, 5, "%04X", id.machine);
482 memcpy(&SYSTEM_EID.type, tmp, 4);
483 }
484
ism_get_seid(void)485 u8 *ism_get_seid(void)
486 {
487 return SYSTEM_EID.seid_string;
488 }
489 EXPORT_SYMBOL_GPL(ism_get_seid);
490
ism_handle_event(struct ism_dev * ism)491 static void ism_handle_event(struct ism_dev *ism)
492 {
493 struct ism_event *entry;
494 struct ism_client *clt;
495 int i;
496
497 while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) {
498 if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry))
499 ism->ieq_idx = 0;
500
501 entry = &ism->ieq->entry[ism->ieq_idx];
502 debug_event(ism_debug_info, 2, entry, sizeof(*entry));
503 for (i = 0; i < max_client; ++i) {
504 clt = ism->subs[i];
505 if (clt)
506 clt->handle_event(ism, entry);
507 }
508 }
509 }
510
ism_handle_irq(int irq,void * data)511 static irqreturn_t ism_handle_irq(int irq, void *data)
512 {
513 struct ism_dev *ism = data;
514 unsigned long bit, end;
515 unsigned long *bv;
516 u16 dmbemask;
517 u8 client_id;
518
519 bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET];
520 end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET;
521
522 spin_lock(&ism->lock);
523 ism->sba->s = 0;
524 barrier();
525 for (bit = 0;;) {
526 bit = find_next_bit_inv(bv, end, bit);
527 if (bit >= end)
528 break;
529
530 clear_bit_inv(bit, bv);
531 dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET];
532 ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
533 barrier();
534 client_id = ism->sba_client_arr[bit];
535 if (unlikely(client_id == NO_CLIENT || !ism->subs[client_id]))
536 continue;
537 ism->subs[client_id]->handle_irq(ism, bit + ISM_DMB_BIT_OFFSET, dmbemask);
538 }
539
540 if (ism->sba->e) {
541 ism->sba->e = 0;
542 barrier();
543 ism_handle_event(ism);
544 }
545 spin_unlock(&ism->lock);
546 return IRQ_HANDLED;
547 }
548
ism_dev_init(struct ism_dev * ism)549 static int ism_dev_init(struct ism_dev *ism)
550 {
551 struct pci_dev *pdev = ism->pdev;
552 int i, ret;
553
554 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
555 if (ret <= 0)
556 goto out;
557
558 ism->sba_client_arr = kzalloc(ISM_NR_DMBS, GFP_KERNEL);
559 if (!ism->sba_client_arr)
560 goto free_vectors;
561 memset(ism->sba_client_arr, NO_CLIENT, ISM_NR_DMBS);
562
563 ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0,
564 pci_name(pdev), ism);
565 if (ret)
566 goto free_client_arr;
567
568 ret = register_sba(ism);
569 if (ret)
570 goto free_irq;
571
572 ret = register_ieq(ism);
573 if (ret)
574 goto unreg_sba;
575
576 ret = ism_read_local_gid(ism);
577 if (ret)
578 goto unreg_ieq;
579
580 if (!ism_add_vlan_id(ism, ISM_RESERVED_VLANID))
581 /* hardware is V2 capable */
582 ism_create_system_eid();
583
584 mutex_lock(&ism_dev_list.mutex);
585 mutex_lock(&clients_lock);
586 for (i = 0; i < max_client; ++i) {
587 if (clients[i]) {
588 clients[i]->add(ism);
589 ism_setup_forwarding(clients[i], ism);
590 }
591 }
592 mutex_unlock(&clients_lock);
593
594 list_add(&ism->list, &ism_dev_list.list);
595 mutex_unlock(&ism_dev_list.mutex);
596
597 query_info(ism);
598 return 0;
599
600 unreg_ieq:
601 unregister_ieq(ism);
602 unreg_sba:
603 unregister_sba(ism);
604 free_irq:
605 free_irq(pci_irq_vector(pdev, 0), ism);
606 free_client_arr:
607 kfree(ism->sba_client_arr);
608 free_vectors:
609 pci_free_irq_vectors(pdev);
610 out:
611 return ret;
612 }
613
ism_probe(struct pci_dev * pdev,const struct pci_device_id * id)614 static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
615 {
616 struct ism_dev *ism;
617 int ret;
618
619 ism = kzalloc(sizeof(*ism), GFP_KERNEL);
620 if (!ism)
621 return -ENOMEM;
622
623 spin_lock_init(&ism->lock);
624 dev_set_drvdata(&pdev->dev, ism);
625 ism->pdev = pdev;
626 ism->dev.parent = &pdev->dev;
627 device_initialize(&ism->dev);
628 dev_set_name(&ism->dev, dev_name(&pdev->dev));
629 ret = device_add(&ism->dev);
630 if (ret)
631 goto err_dev;
632
633 ret = pci_enable_device_mem(pdev);
634 if (ret)
635 goto err;
636
637 ret = pci_request_mem_regions(pdev, DRV_NAME);
638 if (ret)
639 goto err_disable;
640
641 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
642 if (ret)
643 goto err_resource;
644
645 dma_set_seg_boundary(&pdev->dev, SZ_1M - 1);
646 dma_set_max_seg_size(&pdev->dev, SZ_1M);
647 pci_set_master(pdev);
648
649 ret = ism_dev_init(ism);
650 if (ret)
651 goto err_resource;
652
653 return 0;
654
655 err_resource:
656 pci_release_mem_regions(pdev);
657 err_disable:
658 pci_disable_device(pdev);
659 err:
660 device_del(&ism->dev);
661 err_dev:
662 dev_set_drvdata(&pdev->dev, NULL);
663 kfree(ism);
664
665 return ret;
666 }
667
ism_dev_exit(struct ism_dev * ism)668 static void ism_dev_exit(struct ism_dev *ism)
669 {
670 struct pci_dev *pdev = ism->pdev;
671 unsigned long flags;
672 int i;
673
674 spin_lock_irqsave(&ism->lock, flags);
675 for (i = 0; i < max_client; ++i)
676 ism->subs[i] = NULL;
677 spin_unlock_irqrestore(&ism->lock, flags);
678
679 mutex_lock(&ism_dev_list.mutex);
680 mutex_lock(&clients_lock);
681 for (i = 0; i < max_client; ++i) {
682 if (clients[i])
683 clients[i]->remove(ism);
684 }
685 mutex_unlock(&clients_lock);
686
687 if (SYSTEM_EID.serial_number[0] != '0' ||
688 SYSTEM_EID.type[0] != '0')
689 ism_del_vlan_id(ism, ISM_RESERVED_VLANID);
690 unregister_ieq(ism);
691 unregister_sba(ism);
692 free_irq(pci_irq_vector(pdev, 0), ism);
693 kfree(ism->sba_client_arr);
694 pci_free_irq_vectors(pdev);
695 list_del_init(&ism->list);
696 mutex_unlock(&ism_dev_list.mutex);
697 }
698
ism_remove(struct pci_dev * pdev)699 static void ism_remove(struct pci_dev *pdev)
700 {
701 struct ism_dev *ism = dev_get_drvdata(&pdev->dev);
702
703 ism_dev_exit(ism);
704
705 pci_release_mem_regions(pdev);
706 pci_disable_device(pdev);
707 device_del(&ism->dev);
708 dev_set_drvdata(&pdev->dev, NULL);
709 kfree(ism);
710 }
711
712 static struct pci_driver ism_driver = {
713 .name = DRV_NAME,
714 .id_table = ism_device_table,
715 .probe = ism_probe,
716 .remove = ism_remove,
717 };
718
ism_init(void)719 static int __init ism_init(void)
720 {
721 int ret;
722
723 ism_debug_info = debug_register("ism", 2, 1, 16);
724 if (!ism_debug_info)
725 return -ENODEV;
726
727 memset(clients, 0, sizeof(clients));
728 max_client = 0;
729 debug_register_view(ism_debug_info, &debug_hex_ascii_view);
730 ret = pci_register_driver(&ism_driver);
731 if (ret)
732 debug_unregister(ism_debug_info);
733
734 return ret;
735 }
736
ism_exit(void)737 static void __exit ism_exit(void)
738 {
739 pci_unregister_driver(&ism_driver);
740 debug_unregister(ism_debug_info);
741 }
742
743 module_init(ism_init);
744 module_exit(ism_exit);
745
746 /*************************** SMC-D Implementation *****************************/
747
748 #if IS_ENABLED(CONFIG_SMC)
ism_query_rgid(struct ism_dev * ism,u64 rgid,u32 vid_valid,u32 vid)749 static int ism_query_rgid(struct ism_dev *ism, u64 rgid, u32 vid_valid,
750 u32 vid)
751 {
752 union ism_query_rgid cmd;
753
754 memset(&cmd, 0, sizeof(cmd));
755 cmd.request.hdr.cmd = ISM_QUERY_RGID;
756 cmd.request.hdr.len = sizeof(cmd.request);
757
758 cmd.request.rgid = rgid;
759 cmd.request.vlan_valid = vid_valid;
760 cmd.request.vlan_id = vid;
761
762 return ism_cmd(ism, &cmd);
763 }
764
smcd_query_rgid(struct smcd_dev * smcd,u64 rgid,u32 vid_valid,u32 vid)765 static int smcd_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid,
766 u32 vid)
767 {
768 return ism_query_rgid(smcd->priv, rgid, vid_valid, vid);
769 }
770
smcd_register_dmb(struct smcd_dev * smcd,struct smcd_dmb * dmb,struct ism_client * client)771 static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
772 struct ism_client *client)
773 {
774 return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, client);
775 }
776
smcd_unregister_dmb(struct smcd_dev * smcd,struct smcd_dmb * dmb)777 static int smcd_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
778 {
779 return ism_unregister_dmb(smcd->priv, (struct ism_dmb *)dmb);
780 }
781
smcd_add_vlan_id(struct smcd_dev * smcd,u64 vlan_id)782 static int smcd_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
783 {
784 return ism_add_vlan_id(smcd->priv, vlan_id);
785 }
786
smcd_del_vlan_id(struct smcd_dev * smcd,u64 vlan_id)787 static int smcd_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
788 {
789 return ism_del_vlan_id(smcd->priv, vlan_id);
790 }
791
smcd_set_vlan_required(struct smcd_dev * smcd)792 static int smcd_set_vlan_required(struct smcd_dev *smcd)
793 {
794 return ism_cmd_simple(smcd->priv, ISM_SET_VLAN);
795 }
796
smcd_reset_vlan_required(struct smcd_dev * smcd)797 static int smcd_reset_vlan_required(struct smcd_dev *smcd)
798 {
799 return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN);
800 }
801
ism_signal_ieq(struct ism_dev * ism,u64 rgid,u32 trigger_irq,u32 event_code,u64 info)802 static int ism_signal_ieq(struct ism_dev *ism, u64 rgid, u32 trigger_irq,
803 u32 event_code, u64 info)
804 {
805 union ism_sig_ieq cmd;
806
807 memset(&cmd, 0, sizeof(cmd));
808 cmd.request.hdr.cmd = ISM_SIGNAL_IEQ;
809 cmd.request.hdr.len = sizeof(cmd.request);
810
811 cmd.request.rgid = rgid;
812 cmd.request.trigger_irq = trigger_irq;
813 cmd.request.event_code = event_code;
814 cmd.request.info = info;
815
816 return ism_cmd(ism, &cmd);
817 }
818
smcd_signal_ieq(struct smcd_dev * smcd,u64 rgid,u32 trigger_irq,u32 event_code,u64 info)819 static int smcd_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq,
820 u32 event_code, u64 info)
821 {
822 return ism_signal_ieq(smcd->priv, rgid, trigger_irq, event_code, info);
823 }
824
smcd_move(struct smcd_dev * smcd,u64 dmb_tok,unsigned int idx,bool sf,unsigned int offset,void * data,unsigned int size)825 static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
826 bool sf, unsigned int offset, void *data,
827 unsigned int size)
828 {
829 return ism_move(smcd->priv, dmb_tok, idx, sf, offset, data, size);
830 }
831
smcd_supports_v2(void)832 static int smcd_supports_v2(void)
833 {
834 return SYSTEM_EID.serial_number[0] != '0' ||
835 SYSTEM_EID.type[0] != '0';
836 }
837
ism_get_local_gid(struct ism_dev * ism)838 static u64 ism_get_local_gid(struct ism_dev *ism)
839 {
840 return ism->local_gid;
841 }
842
smcd_get_local_gid(struct smcd_dev * smcd)843 static u64 smcd_get_local_gid(struct smcd_dev *smcd)
844 {
845 return ism_get_local_gid(smcd->priv);
846 }
847
ism_get_chid(struct ism_dev * ism)848 static u16 ism_get_chid(struct ism_dev *ism)
849 {
850 if (!ism || !ism->pdev)
851 return 0;
852
853 return to_zpci(ism->pdev)->pchid;
854 }
855
smcd_get_chid(struct smcd_dev * smcd)856 static u16 smcd_get_chid(struct smcd_dev *smcd)
857 {
858 return ism_get_chid(smcd->priv);
859 }
860
smcd_get_dev(struct smcd_dev * dev)861 static inline struct device *smcd_get_dev(struct smcd_dev *dev)
862 {
863 struct ism_dev *ism = dev->priv;
864
865 return &ism->dev;
866 }
867
868 static const struct smcd_ops ism_ops = {
869 .query_remote_gid = smcd_query_rgid,
870 .register_dmb = smcd_register_dmb,
871 .unregister_dmb = smcd_unregister_dmb,
872 .add_vlan_id = smcd_add_vlan_id,
873 .del_vlan_id = smcd_del_vlan_id,
874 .set_vlan_required = smcd_set_vlan_required,
875 .reset_vlan_required = smcd_reset_vlan_required,
876 .signal_event = smcd_signal_ieq,
877 .move_data = smcd_move,
878 .supports_v2 = smcd_supports_v2,
879 .get_system_eid = ism_get_seid,
880 .get_local_gid = smcd_get_local_gid,
881 .get_chid = smcd_get_chid,
882 .get_dev = smcd_get_dev,
883 };
884
ism_get_smcd_ops(void)885 const struct smcd_ops *ism_get_smcd_ops(void)
886 {
887 return &ism_ops;
888 }
889 EXPORT_SYMBOL_GPL(ism_get_smcd_ops);
890 #endif
891