summaryrefslogtreecommitdiff
path: root/drivers/s390/net/ism_drv.c
blob: 4fc2056bd2272b2607d4d6a89c73b0e91c7c9015 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
// SPDX-License-Identifier: GPL-2.0
/*
 * ISM driver for s390.
 *
 * Copyright IBM Corp. 2018
 */
#define KMSG_COMPONENT "ism"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/err.h>
#include <net/smc.h>

#include <asm/debug.h>

#include "ism.h"

MODULE_DESCRIPTION("ISM driver for s390");
MODULE_LICENSE("GPL");

#define PCI_DEVICE_ID_IBM_ISM 0x04ED
#define DRV_NAME "ism"

static const struct pci_device_id ism_device_table[] = {
	{ PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, ism_device_table);

static debug_info_t *ism_debug_info;

static int ism_cmd(struct ism_dev *ism, void *cmd)
{
	struct ism_req_hdr *req = cmd;
	struct ism_resp_hdr *resp = cmd;

	__ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req));
	__ism_write_cmd(ism, req, 0, sizeof(*req));

	WRITE_ONCE(resp->ret, ISM_ERROR);

	__ism_read_cmd(ism, resp, 0, sizeof(*resp));
	if (resp->ret) {
		debug_text_event(ism_debug_info, 0, "cmd failure");
		debug_event(ism_debug_info, 0, resp, sizeof(*resp));
		goto out;
	}
	__ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp));
out:
	return resp->ret;
}

static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code)
{
	union ism_cmd_simple cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = cmd_code;
	cmd.request.hdr.len = sizeof(cmd.request);

	return ism_cmd(ism, &cmd);
}

static int query_info(struct ism_dev *ism)
{
	union ism_qi cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_QUERY_INFO;
	cmd.request.hdr.len = sizeof(cmd.request);

	if (ism_cmd(ism, &cmd))
		goto out;

	debug_text_event(ism_debug_info, 3, "query info");
	debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response));
out:
	return 0;
}

static int register_sba(struct ism_dev *ism)
{
	union ism_reg_sba cmd;
	dma_addr_t dma_handle;
	struct ism_sba *sba;

	sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
				 GFP_KERNEL);
	if (!sba)
		return -ENOMEM;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_REG_SBA;
	cmd.request.hdr.len = sizeof(cmd.request);
	cmd.request.sba = dma_handle;

	if (ism_cmd(ism, &cmd)) {
		dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle);
		return -EIO;
	}

	ism->sba = sba;
	ism->sba_dma_addr = dma_handle;

	return 0;
}

static int register_ieq(struct ism_dev *ism)
{
	union ism_reg_ieq cmd;
	dma_addr_t dma_handle;
	struct ism_eq *ieq;

	ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle,
				 GFP_KERNEL);
	if (!ieq)
		return -ENOMEM;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_REG_IEQ;
	cmd.request.hdr.len = sizeof(cmd.request);
	cmd.request.ieq = dma_handle;
	cmd.request.len = sizeof(*ieq);

	if (ism_cmd(ism, &cmd)) {
		dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle);
		return -EIO;
	}

	ism->ieq = ieq;
	ism->ieq_idx = -1;
	ism->ieq_dma_addr = dma_handle;

	return 0;
}

static int unregister_sba(struct ism_dev *ism)
{
	int ret;

	if (!ism->sba)
		return 0;

	ret = ism_cmd_simple(ism, ISM_UNREG_SBA);
	if (ret && ret != ISM_ERROR)
		return -EIO;

	dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
			  ism->sba, ism->sba_dma_addr);

	ism->sba = NULL;
	ism->sba_dma_addr = 0;

	return 0;
}

static int unregister_ieq(struct ism_dev *ism)
{
	int ret;

	if (!ism->ieq)
		return 0;

	ret = ism_cmd_simple(ism, ISM_UNREG_IEQ);
	if (ret && ret != ISM_ERROR)
		return -EIO;

	dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
			  ism->ieq, ism->ieq_dma_addr);

	ism->ieq = NULL;
	ism->ieq_dma_addr = 0;

	return 0;
}

static int ism_read_local_gid(struct ism_dev *ism)
{
	union ism_read_gid cmd;
	int ret;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_READ_GID;
	cmd.request.hdr.len = sizeof(cmd.request);

	ret = ism_cmd(ism, &cmd);
	if (ret)
		goto out;

	ism->smcd->local_gid = cmd.response.gid;
out:
	return ret;
}

static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid,
			  u32 vid)
{
	struct ism_dev *ism = smcd->priv;
	union ism_query_rgid cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_QUERY_RGID;
	cmd.request.hdr.len = sizeof(cmd.request);

	cmd.request.rgid = rgid;
	cmd.request.vlan_valid = vid_valid;
	cmd.request.vlan_id = vid;

	return ism_cmd(ism, &cmd);
}

static void ism_free_dmb(struct ism_dev *ism, struct smcd_dmb *dmb)
{
	clear_bit(dmb->sba_idx, ism->sba_bitmap);
	dma_free_coherent(&ism->pdev->dev, dmb->dmb_len,
			  dmb->cpu_addr, dmb->dma_addr);
}

static int ism_alloc_dmb(struct ism_dev *ism, struct smcd_dmb *dmb)
{
	unsigned long bit;

	if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev))
		return -EINVAL;

	if (!dmb->sba_idx) {
		bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS,
					 ISM_DMB_BIT_OFFSET);
		if (bit == ISM_NR_DMBS)
			return -ENOMEM;

		dmb->sba_idx = bit;
	}
	if (dmb->sba_idx < ISM_DMB_BIT_OFFSET ||
	    test_and_set_bit(dmb->sba_idx, ism->sba_bitmap))
		return -EINVAL;

	dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len,
					   &dmb->dma_addr,
					   GFP_KERNEL | __GFP_NOWARN | __GFP_NOMEMALLOC | __GFP_COMP | __GFP_NORETRY);
	if (!dmb->cpu_addr)
		clear_bit(dmb->sba_idx, ism->sba_bitmap);

	return dmb->cpu_addr ? 0 : -ENOMEM;
}

static int ism_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
{
	struct ism_dev *ism = smcd->priv;
	union ism_reg_dmb cmd;
	int ret;

	ret = ism_alloc_dmb(ism, dmb);
	if (ret)
		goto out;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_REG_DMB;
	cmd.request.hdr.len = sizeof(cmd.request);

	cmd.request.dmb = dmb->dma_addr;
	cmd.request.dmb_len = dmb->dmb_len;
	cmd.request.sba_idx = dmb->sba_idx;
	cmd.request.vlan_valid = dmb->vlan_valid;
	cmd.request.vlan_id = dmb->vlan_id;
	cmd.request.rgid = dmb->rgid;

	ret = ism_cmd(ism, &cmd);
	if (ret) {
		ism_free_dmb(ism, dmb);
		goto out;
	}
	dmb->dmb_tok = cmd.response.dmb_tok;
out:
	return ret;
}

static int ism_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
{
	struct ism_dev *ism = smcd->priv;
	union ism_unreg_dmb cmd;
	int ret;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_UNREG_DMB;
	cmd.request.hdr.len = sizeof(cmd.request);

	cmd.request.dmb_tok = dmb->dmb_tok;

	ret = ism_cmd(ism, &cmd);
	if (ret && ret != ISM_ERROR)
		goto out;

	ism_free_dmb(ism, dmb);
out:
	return ret;
}

static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
{
	struct ism_dev *ism = smcd->priv;
	union ism_set_vlan_id cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_ADD_VLAN_ID;
	cmd.request.hdr.len = sizeof(cmd.request);

	cmd.request.vlan_id = vlan_id;

	return ism_cmd(ism, &cmd);
}

static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
{
	struct ism_dev *ism = smcd->priv;
	union ism_set_vlan_id cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_DEL_VLAN_ID;
	cmd.request.hdr.len = sizeof(cmd.request);

	cmd.request.vlan_id = vlan_id;

	return ism_cmd(ism, &cmd);
}

static int ism_set_vlan_required(struct smcd_dev *smcd)
{
	return ism_cmd_simple(smcd->priv, ISM_SET_VLAN);
}

static int ism_reset_vlan_required(struct smcd_dev *smcd)
{
	return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN);
}

static int ism_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq,
			  u32 event_code, u64 info)
{
	struct ism_dev *ism = smcd->priv;
	union ism_sig_ieq cmd;

	memset(&cmd, 0, sizeof(cmd));
	cmd.request.hdr.cmd = ISM_SIGNAL_IEQ;
	cmd.request.hdr.len = sizeof(cmd.request);

	cmd.request.rgid = rgid;
	cmd.request.trigger_irq = trigger_irq;
	cmd.request.event_code = event_code;
	cmd.request.info = info;

	return ism_cmd(ism, &cmd);
}

static unsigned int max_bytes(unsigned int start, unsigned int len,
			      unsigned int boundary)
{
	return min(boundary - (start & (boundary - 1)), len);
}

static int ism_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
		    bool sf, unsigned int offset, void *data, unsigned int size)
{
	struct ism_dev *ism = smcd->priv;
	unsigned int bytes;
	u64 dmb_req;
	int ret;

	while (size) {
		bytes = max_bytes(offset, size, PAGE_SIZE);
		dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0,
					 offset);

		ret = __ism_move(ism, dmb_req, data, bytes);
		if (ret)
			return ret;

		size -= bytes;
		data += bytes;
		offset += bytes;
	}

	return 0;
}

static void ism_handle_event(struct ism_dev *ism)
{
	struct smcd_event *entry;

	while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) {
		if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry))
			ism->ieq_idx = 0;

		entry = &ism->ieq->entry[ism->ieq_idx];
		debug_event(ism_debug_info, 2, entry, sizeof(*entry));
		smcd_handle_event(ism->smcd, entry);
	}
}

static irqreturn_t ism_handle_irq(int irq, void *data)
{
	struct ism_dev *ism = data;
	unsigned long bit, end;
	unsigned long *bv;

	bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET];
	end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET;

	spin_lock(&ism->lock);
	ism->sba->s = 0;
	barrier();
	for (bit = 0;;) {
		bit = find_next_bit_inv(bv, end, bit);
		if (bit >= end)
			break;

		clear_bit_inv(bit, bv);
		ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
		barrier();
		smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET);
	}

	if (ism->sba->e) {
		ism->sba->e = 0;
		barrier();
		ism_handle_event(ism);
	}
	spin_unlock(&ism->lock);
	return IRQ_HANDLED;
}

static const struct smcd_ops ism_ops = {
	.query_remote_gid = ism_query_rgid,
	.register_dmb = ism_register_dmb,
	.unregister_dmb = ism_unregister_dmb,
	.add_vlan_id = ism_add_vlan_id,
	.del_vlan_id = ism_del_vlan_id,
	.set_vlan_required = ism_set_vlan_required,
	.reset_vlan_required = ism_reset_vlan_required,
	.signal_event = ism_signal_ieq,
	.move_data = ism_move,
};

static int ism_dev_init(struct ism_dev *ism)
{
	struct pci_dev *pdev = ism->pdev;
	int ret;

	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
	if (ret <= 0)
		goto out;

	ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0,
			  pci_name(pdev), ism);
	if (ret)
		goto free_vectors;

	ret = register_sba(ism);
	if (ret)
		goto free_irq;

	ret = register_ieq(ism);
	if (ret)
		goto unreg_sba;

	ret = ism_read_local_gid(ism);
	if (ret)
		goto unreg_ieq;

	ret = smcd_register_dev(ism->smcd);
	if (ret)
		goto unreg_ieq;

	query_info(ism);
	return 0;

unreg_ieq:
	unregister_ieq(ism);
unreg_sba:
	unregister_sba(ism);
free_irq:
	free_irq(pci_irq_vector(pdev, 0), ism);
free_vectors:
	pci_free_irq_vectors(pdev);
out:
	return ret;
}

static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct ism_dev *ism;
	int ret;

	ism = kzalloc(sizeof(*ism), GFP_KERNEL);
	if (!ism)
		return -ENOMEM;

	spin_lock_init(&ism->lock);
	dev_set_drvdata(&pdev->dev, ism);
	ism->pdev = pdev;

	ret = pci_enable_device_mem(pdev);
	if (ret)
		goto err;

	ret = pci_request_mem_regions(pdev, DRV_NAME);
	if (ret)
		goto err_disable;

	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
	if (ret)
		goto err_resource;

	dma_set_seg_boundary(&pdev->dev, SZ_1M - 1);
	dma_set_max_seg_size(&pdev->dev, SZ_1M);
	pci_set_master(pdev);

	ism->smcd = smcd_alloc_dev(&pdev->dev, dev_name(&pdev->dev), &ism_ops,
				   ISM_NR_DMBS);
	if (!ism->smcd)
		goto err_resource;

	ism->smcd->priv = ism;
	ret = ism_dev_init(ism);
	if (ret)
		goto err_free;

	return 0;

err_free:
	smcd_free_dev(ism->smcd);
err_resource:
	pci_release_mem_regions(pdev);
err_disable:
	pci_disable_device(pdev);
err:
	kfree(ism);
	dev_set_drvdata(&pdev->dev, NULL);
	return ret;
}

static void ism_dev_exit(struct ism_dev *ism)
{
	struct pci_dev *pdev = ism->pdev;

	smcd_unregister_dev(ism->smcd);
	unregister_ieq(ism);
	unregister_sba(ism);
	free_irq(pci_irq_vector(pdev, 0), ism);
	pci_free_irq_vectors(pdev);
}

static void ism_remove(struct pci_dev *pdev)
{
	struct ism_dev *ism = dev_get_drvdata(&pdev->dev);

	ism_dev_exit(ism);

	smcd_free_dev(ism->smcd);
	pci_release_mem_regions(pdev);
	pci_disable_device(pdev);
	dev_set_drvdata(&pdev->dev, NULL);
	kfree(ism);
}

static int ism_suspend(struct device *dev)
{
	struct ism_dev *ism = dev_get_drvdata(dev);

	ism_dev_exit(ism);
	return 0;
}

static int ism_resume(struct device *dev)
{
	struct ism_dev *ism = dev_get_drvdata(dev);

	return ism_dev_init(ism);
}

static SIMPLE_DEV_PM_OPS(ism_pm_ops, ism_suspend, ism_resume);

static struct pci_driver ism_driver = {
	.name	  = DRV_NAME,
	.id_table = ism_device_table,
	.probe	  = ism_probe,
	.remove	  = ism_remove,
	.driver	  = {
		.pm = &ism_pm_ops,
	},
};

static int __init ism_init(void)
{
	int ret;

	ism_debug_info = debug_register("ism", 2, 1, 16);
	if (!ism_debug_info)
		return -ENODEV;

	debug_register_view(ism_debug_info, &debug_hex_ascii_view);
	ret = pci_register_driver(&ism_driver);
	if (ret)
		debug_unregister(ism_debug_info);

	return ret;
}

static void __exit ism_exit(void)
{
	pci_unregister_driver(&ism_driver);
	debug_unregister(ism_debug_info);
}

module_init(ism_init);
module_exit(ism_exit);