summaryrefslogtreecommitdiff
path: root/drivers/misc/mic/scif/scif_main.c
blob: f7187dc6851980650788bc406b501c5fd1de0a5c (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
/*
 * Intel MIC Platform Software Stack (MPSS)
 *
 * Copyright(c) 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * Intel SCIF driver.
 *
 */
#include <linux/module.h>
#include <linux/idr.h>

#include <linux/mic_common.h>
#include "../common/mic_dev.h"
#include "../bus/scif_bus.h"
#include "scif_peer_bus.h"
#include "scif_main.h"
#include "scif_map.h"

struct scif_info scif_info = {
	.mdev = {
		.minor = MISC_DYNAMIC_MINOR,
		.name = "scif",
		.fops = &scif_fops,
	}
};

struct scif_dev *scif_dev;
static atomic_t g_loopb_cnt;

/* Runs in the context of intr_wq */
static void scif_intr_bh_handler(struct work_struct *work)
{
	struct scif_dev *scifdev =
			container_of(work, struct scif_dev, intr_bh);

	if (scifdev_self(scifdev))
		scif_loopb_msg_handler(scifdev, scifdev->qpairs);
	else
		scif_nodeqp_intrhandler(scifdev, scifdev->qpairs);
}

int scif_setup_intr_wq(struct scif_dev *scifdev)
{
	if (!scifdev->intr_wq) {
		snprintf(scifdev->intr_wqname, sizeof(scifdev->intr_wqname),
			 "SCIF INTR %d", scifdev->node);
		scifdev->intr_wq =
			alloc_ordered_workqueue(scifdev->intr_wqname, 0);
		if (!scifdev->intr_wq)
			return -ENOMEM;
		INIT_WORK(&scifdev->intr_bh, scif_intr_bh_handler);
	}
	return 0;
}

void scif_destroy_intr_wq(struct scif_dev *scifdev)
{
	if (scifdev->intr_wq) {
		destroy_workqueue(scifdev->intr_wq);
		scifdev->intr_wq = NULL;
	}
}

irqreturn_t scif_intr_handler(int irq, void *data)
{
	struct scif_dev *scifdev = data;
	struct scif_hw_dev *sdev = scifdev->sdev;

	sdev->hw_ops->ack_interrupt(sdev, scifdev->db);
	queue_work(scifdev->intr_wq, &scifdev->intr_bh);
	return IRQ_HANDLED;
}

static int scif_peer_probe(struct scif_peer_dev *spdev)
{
	struct scif_dev *scifdev = &scif_dev[spdev->dnode];

	mutex_lock(&scif_info.conflock);
	scif_info.total++;
	scif_info.maxid = max_t(u32, spdev->dnode, scif_info.maxid);
	mutex_unlock(&scif_info.conflock);
	rcu_assign_pointer(scifdev->spdev, spdev);

	/* In the future SCIF kernel client devices will be added here */
	dev_info(&spdev->dev, "Peer added dnode %d\n",
		 spdev->dnode);
	return 0;
}

static void scif_peer_remove(struct scif_peer_dev *spdev)
{
	struct scif_dev *scifdev = &scif_dev[spdev->dnode];

	/* In the future SCIF kernel client devices will be removed here */
	spdev = rcu_dereference(scifdev->spdev);
	if (spdev)
		RCU_INIT_POINTER(scifdev->spdev, NULL);
	synchronize_rcu();

	mutex_lock(&scif_info.conflock);
	scif_info.total--;
	mutex_unlock(&scif_info.conflock);
	dev_info(&spdev->dev, "Peer removed dnode %d\n",
		 spdev->dnode);
}

static void scif_qp_setup_handler(struct work_struct *work)
{
	struct scif_dev *scifdev = container_of(work, struct scif_dev,
						qp_dwork.work);
	struct scif_hw_dev *sdev = scifdev->sdev;
	dma_addr_t da = 0;
	int err;

	if (scif_is_mgmt_node()) {
		struct mic_bootparam *bp = sdev->dp;

		da = bp->scif_card_dma_addr;
		scifdev->rdb = bp->h2c_scif_db;
	} else {
		struct mic_bootparam __iomem *bp = sdev->rdp;

		da = readq(&bp->scif_host_dma_addr);
		scifdev->rdb = ioread8(&bp->c2h_scif_db);
	}
	if (da) {
		err = scif_qp_response(da, scifdev);
		if (err)
			dev_err(&scifdev->sdev->dev,
				"scif_qp_response err %d\n", err);
	} else {
		schedule_delayed_work(&scifdev->qp_dwork,
				      msecs_to_jiffies(1000));
	}
}

static int scif_setup_scifdev(struct scif_hw_dev *sdev)
{
	int i;
	u8 num_nodes;

	if (sdev->snode) {
		struct mic_bootparam __iomem *bp = sdev->rdp;

		num_nodes = ioread8(&bp->tot_nodes);
	} else {
		struct mic_bootparam *bp = sdev->dp;

		num_nodes = bp->tot_nodes;
	}
	scif_dev = kcalloc(num_nodes, sizeof(*scif_dev), GFP_KERNEL);
	if (!scif_dev)
		return -ENOMEM;
	for (i = 0; i < num_nodes; i++) {
		struct scif_dev *scifdev = &scif_dev[i];

		scifdev->node = i;
		scifdev->exit = OP_IDLE;
		init_waitqueue_head(&scifdev->disconn_wq);
		mutex_init(&scifdev->lock);
		INIT_WORK(&scifdev->init_msg_work, scif_qp_response_ack);
		INIT_DELAYED_WORK(&scifdev->p2p_dwork,
				  scif_poll_qp_state);
		INIT_DELAYED_WORK(&scifdev->qp_dwork,
				  scif_qp_setup_handler);
		INIT_LIST_HEAD(&scifdev->p2p);
		RCU_INIT_POINTER(scifdev->spdev, NULL);
	}
	return 0;
}

static void scif_destroy_scifdev(void)
{
	kfree(scif_dev);
}

static int scif_probe(struct scif_hw_dev *sdev)
{
	struct scif_dev *scifdev;
	int rc;

	dev_set_drvdata(&sdev->dev, sdev);
	if (1 == atomic_add_return(1, &g_loopb_cnt)) {
		struct scif_dev *loopb_dev;

		rc = scif_setup_scifdev(sdev);
		if (rc)
			goto exit;
		scifdev = &scif_dev[sdev->dnode];
		scifdev->sdev = sdev;
		loopb_dev = &scif_dev[sdev->snode];
		loopb_dev->sdev = sdev;
		rc = scif_setup_loopback_qp(loopb_dev);
		if (rc)
			goto free_sdev;
	} else {
		scifdev = &scif_dev[sdev->dnode];
		scifdev->sdev = sdev;
	}
	rc = scif_setup_intr_wq(scifdev);
	if (rc)
		goto destroy_loopb;
	rc = scif_setup_qp(scifdev);
	if (rc)
		goto destroy_intr;
	scifdev->db = sdev->hw_ops->next_db(sdev);
	scifdev->cookie = sdev->hw_ops->request_irq(sdev, scif_intr_handler,
						    "SCIF_INTR", scifdev,
						    scifdev->db);
	if (IS_ERR(scifdev->cookie)) {
		rc = PTR_ERR(scifdev->cookie);
		goto free_qp;
	}
	if (scif_is_mgmt_node()) {
		struct mic_bootparam *bp = sdev->dp;

		bp->c2h_scif_db = scifdev->db;
		bp->scif_host_dma_addr = scifdev->qp_dma_addr;
	} else {
		struct mic_bootparam __iomem *bp = sdev->rdp;

		iowrite8(scifdev->db, &bp->h2c_scif_db);
		writeq(scifdev->qp_dma_addr, &bp->scif_card_dma_addr);
	}
	schedule_delayed_work(&scifdev->qp_dwork,
			      msecs_to_jiffies(1000));
	return rc;
free_qp:
	scif_free_qp(scifdev);
destroy_intr:
	scif_destroy_intr_wq(scifdev);
destroy_loopb:
	if (atomic_dec_and_test(&g_loopb_cnt))
		scif_destroy_loopback_qp(&scif_dev[sdev->snode]);
free_sdev:
	scif_destroy_scifdev();
exit:
	return rc;
}

void scif_stop(struct scif_dev *scifdev)
{
	struct scif_dev *dev;
	int i;

	for (i = scif_info.maxid; i >= 0; i--) {
		dev = &scif_dev[i];
		if (scifdev_self(dev))
			continue;
		scif_handle_remove_node(i);
	}
}

static void scif_remove(struct scif_hw_dev *sdev)
{
	struct scif_dev *scifdev = &scif_dev[sdev->dnode];

	if (scif_is_mgmt_node()) {
		struct mic_bootparam *bp = sdev->dp;

		bp->c2h_scif_db = -1;
		bp->scif_host_dma_addr = 0x0;
	} else {
		struct mic_bootparam __iomem *bp = sdev->rdp;

		iowrite8(-1, &bp->h2c_scif_db);
		writeq(0x0, &bp->scif_card_dma_addr);
	}
	if (scif_is_mgmt_node()) {
		scif_disconnect_node(scifdev->node, true);
	} else {
		scif_info.card_initiated_exit = true;
		scif_stop(scifdev);
	}
	if (atomic_dec_and_test(&g_loopb_cnt))
		scif_destroy_loopback_qp(&scif_dev[sdev->snode]);
	if (scifdev->cookie) {
		sdev->hw_ops->free_irq(sdev, scifdev->cookie, scifdev);
		scifdev->cookie = NULL;
	}
	scif_destroy_intr_wq(scifdev);
	cancel_delayed_work(&scifdev->qp_dwork);
	scif_free_qp(scifdev);
	scifdev->rdb = -1;
	scifdev->sdev = NULL;
}

static struct scif_peer_driver scif_peer_driver = {
	.driver.name =	KBUILD_MODNAME,
	.driver.owner =	THIS_MODULE,
	.probe = scif_peer_probe,
	.remove = scif_peer_remove,
};

static struct scif_hw_dev_id id_table[] = {
	{ MIC_SCIF_DEV, SCIF_DEV_ANY_ID },
	{ 0 },
};

static struct scif_driver scif_driver = {
	.driver.name =	KBUILD_MODNAME,
	.driver.owner =	THIS_MODULE,
	.id_table = id_table,
	.probe = scif_probe,
	.remove = scif_remove,
};

static int _scif_init(void)
{
	spin_lock_init(&scif_info.eplock);
	spin_lock_init(&scif_info.nb_connect_lock);
	spin_lock_init(&scif_info.port_lock);
	mutex_init(&scif_info.conflock);
	mutex_init(&scif_info.connlock);
	INIT_LIST_HEAD(&scif_info.uaccept);
	INIT_LIST_HEAD(&scif_info.listen);
	INIT_LIST_HEAD(&scif_info.zombie);
	INIT_LIST_HEAD(&scif_info.connected);
	INIT_LIST_HEAD(&scif_info.disconnected);
	INIT_LIST_HEAD(&scif_info.nb_connect_list);
	init_waitqueue_head(&scif_info.exitwq);
	scif_info.en_msg_log = 0;
	scif_info.p2p_enable = 1;
	INIT_WORK(&scif_info.misc_work, scif_misc_handler);
	INIT_WORK(&scif_info.conn_work, scif_conn_handler);
	idr_init(&scif_ports);
	return 0;
}

static void _scif_exit(void)
{
	idr_destroy(&scif_ports);
	scif_destroy_scifdev();
}

static int __init scif_init(void)
{
	struct miscdevice *mdev = &scif_info.mdev;
	int rc;

	_scif_init();
	rc = scif_peer_bus_init();
	if (rc)
		goto exit;
	rc = scif_peer_register_driver(&scif_peer_driver);
	if (rc)
		goto peer_bus_exit;
	rc = scif_register_driver(&scif_driver);
	if (rc)
		goto unreg_scif_peer;
	rc = misc_register(mdev);
	if (rc)
		goto unreg_scif;
	scif_init_debugfs();
	return 0;
unreg_scif:
	scif_unregister_driver(&scif_driver);
unreg_scif_peer:
	scif_peer_unregister_driver(&scif_peer_driver);
peer_bus_exit:
	scif_peer_bus_exit();
exit:
	_scif_exit();
	return rc;
}

static void __exit scif_exit(void)
{
	scif_exit_debugfs();
	misc_deregister(&scif_info.mdev);
	scif_unregister_driver(&scif_driver);
	scif_peer_unregister_driver(&scif_peer_driver);
	scif_peer_bus_exit();
	_scif_exit();
}

module_init(scif_init);
module_exit(scif_exit);

MODULE_DEVICE_TABLE(scif, id_table);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) SCIF driver");
MODULE_LICENSE("GPL v2");