summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/vio.c
blob: 32bae68e34c1b617c2e1547cbea9f609dc285d8f (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
// SPDX-License-Identifier: GPL-2.0
/* vio.c: Virtual I/O channel devices probing infrastructure.
 *
 *    Copyright (c) 2003-2005 IBM Corp.
 *     Dave Engebretsen engebret@us.ibm.com
 *     Santiago Leon santil@us.ibm.com
 *     Hollis Blanchard <hollisb@us.ibm.com>
 *     Stephen Rothwell
 *
 * Adapted to sparc64 by David S. Miller davem@davemloft.net
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/export.h>
#include <linux/init.h>

#include <asm/mdesc.h>
#include <asm/vio.h>

static const struct vio_device_id *vio_match_device(
	const struct vio_device_id *matches,
	const struct vio_dev *dev)
{
	const char *type, *compat;
	int len;

	type = dev->type;
	compat = dev->compat;
	len = dev->compat_len;

	while (matches->type[0] || matches->compat[0]) {
		int match = 1;
		if (matches->type[0])
			match &= !strcmp(matches->type, type);

		if (matches->compat[0]) {
			match &= len &&
				of_find_in_proplist(compat, matches->compat, len);
		}
		if (match)
			return matches;
		matches++;
	}
	return NULL;
}

static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
{
	const struct vio_dev *vio_dev = to_vio_dev(dev);

	add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
	return 0;
}

static int vio_bus_match(struct device *dev, struct device_driver *drv)
{
	struct vio_dev *vio_dev = to_vio_dev(dev);
	struct vio_driver *vio_drv = to_vio_driver(drv);
	const struct vio_device_id *matches = vio_drv->id_table;

	if (!matches)
		return 0;

	return vio_match_device(matches, vio_dev) != NULL;
}

static int vio_device_probe(struct device *dev)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_driver *drv = to_vio_driver(dev->driver);
	const struct vio_device_id *id;

	if (!drv->probe)
		return -ENODEV;

	id = vio_match_device(drv->id_table, vdev);
	if (!id)
		return -ENODEV;

	/* alloc irqs (unless the driver specified not to) */
	if (!drv->no_irq) {
		if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
			vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
							vdev->tx_ino);

		if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
			vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
							vdev->rx_ino);
	}

	return drv->probe(vdev, id);
}

static int vio_device_remove(struct device *dev)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_driver *drv = to_vio_driver(dev->driver);

	if (drv->remove) {
		/*
		 * Ideally, we would remove/deallocate tx/rx virqs
		 * here - however, there are currently no support
		 * routines to do so at the moment. TBD
		 */

		return drv->remove(vdev);
	}

	return 1;
}

static ssize_t devspec_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	const char *str = "none";

	if (!strcmp(vdev->type, "vnet-port"))
		str = "vnet";
	else if (!strcmp(vdev->type, "vdc-port"))
		str = "vdisk";

	return sprintf(buf, "%s\n", str);
}
static DEVICE_ATTR_RO(devspec);

static ssize_t type_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	return sprintf(buf, "%s\n", vdev->type);
}
static DEVICE_ATTR_RO(type);

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	const struct vio_dev *vdev = to_vio_dev(dev);

	return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
}
static DEVICE_ATTR_RO(modalias);

static struct attribute *vio_dev_attrs[] = {
	&dev_attr_devspec.attr,
	&dev_attr_type.attr,
	&dev_attr_modalias.attr,
	NULL,
 };
ATTRIBUTE_GROUPS(vio_dev);

static struct bus_type vio_bus_type = {
	.name		= "vio",
	.dev_groups	= vio_dev_groups,
	.uevent         = vio_hotplug,
	.match		= vio_bus_match,
	.probe		= vio_device_probe,
	.remove		= vio_device_remove,
};

int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
			const char *mod_name)
{
	viodrv->driver.bus = &vio_bus_type;
	viodrv->driver.name = viodrv->name;
	viodrv->driver.owner = owner;
	viodrv->driver.mod_name = mod_name;

	return driver_register(&viodrv->driver);
}
EXPORT_SYMBOL(__vio_register_driver);

void vio_unregister_driver(struct vio_driver *viodrv)
{
	driver_unregister(&viodrv->driver);
}
EXPORT_SYMBOL(vio_unregister_driver);

static void vio_dev_release(struct device *dev)
{
	kfree(to_vio_dev(dev));
}

static ssize_t
show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct vio_dev *vdev;
	struct device_node *dp;

	vdev = to_vio_dev(dev);
	dp = vdev->dp;

	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
}

static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
		   show_pciobppath_attr, NULL);

static struct device_node *cdev_node;

static struct vio_dev *root_vdev;
static u64 cdev_cfg_handle;

static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
{
	const u64 *cfg_handle = NULL;
	u64 a;

	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
		u64 target;

		target = mdesc_arc_target(hp, a);
		cfg_handle = mdesc_get_property(hp, target,
						"cfg-handle", NULL);
		if (cfg_handle)
			break;
	}

	return cfg_handle;
}

/**
 * vio_vdev_node() - Find VDEV node in MD
 * @hp:  Handle to the MD
 * @vdev:  Pointer to VDEV
 *
 * Find the node in the current MD which matches the given vio_dev. This
 * must be done dynamically since the node value can change if the MD
 * is updated.
 *
 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
 *
 * Return: The VDEV node in MDESC
 */
u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
{
	u64 node;

	if (vdev == NULL)
		return MDESC_NODE_NULL;

	node = mdesc_get_node(hp, (const char *)vdev->node_name,
			      &vdev->md_node_info);

	return node;
}
EXPORT_SYMBOL(vio_vdev_node);

static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
				  struct vio_dev *vdev)
{
	u64 a;

	vdev->tx_ino = ~0UL;
	vdev->rx_ino = ~0UL;
	vdev->channel_id = ~0UL;
	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
		const u64 *chan_id;
		const u64 *irq;
		u64 target;

		target = mdesc_arc_target(hp, a);

		irq = mdesc_get_property(hp, target, "tx-ino", NULL);
		if (irq)
			vdev->tx_ino = *irq;

		irq = mdesc_get_property(hp, target, "rx-ino", NULL);
		if (irq)
			vdev->rx_ino = *irq;

		chan_id = mdesc_get_property(hp, target, "id", NULL);
		if (chan_id)
			vdev->channel_id = *chan_id;
	}

	vdev->cdev_handle = cdev_cfg_handle;
}

int vio_set_intr(unsigned long dev_ino, int state)
{
	int err;

	err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
	return err;
}
EXPORT_SYMBOL(vio_set_intr);

static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
				      const char *node_name,
				      struct device *parent)
{
	const char *type, *compat;
	struct device_node *dp;
	struct vio_dev *vdev;
	int err, tlen, clen;
	const u64 *id, *cfg_handle;

	type = mdesc_get_property(hp, mp, "device-type", &tlen);
	if (!type) {
		type = mdesc_get_property(hp, mp, "name", &tlen);
		if (!type) {
			type = mdesc_node_name(hp, mp);
			tlen = strlen(type) + 1;
		}
	}
	if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
		printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
		       type);
		return NULL;
	}

	id = mdesc_get_property(hp, mp, "id", NULL);

	cfg_handle = vio_cfg_handle(hp, mp);

	compat = mdesc_get_property(hp, mp, "device-type", &clen);
	if (!compat) {
		clen = 0;
	} else if (clen > VIO_MAX_COMPAT_LEN) {
		printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
		       clen, type);
		return NULL;
	}

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev) {
		printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
		return NULL;
	}

	vdev->mp = mp;
	memcpy(vdev->type, type, tlen);
	if (compat)
		memcpy(vdev->compat, compat, clen);
	else
		memset(vdev->compat, 0, sizeof(vdev->compat));
	vdev->compat_len = clen;

	vdev->port_id = ~0UL;
	vdev->tx_irq = 0;
	vdev->rx_irq = 0;

	vio_fill_channel_info(hp, mp, vdev);

	if (!id) {
		dev_set_name(&vdev->dev, "%s", type);
		vdev->dev_no = ~(u64)0;
	} else if (!cfg_handle) {
		dev_set_name(&vdev->dev, "%s-%llu", type, *id);
		vdev->dev_no = *id;
	} else {
		dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
			     *cfg_handle, *id);
		vdev->dev_no = *cfg_handle;
		vdev->port_id = *id;
	}

	vdev->dev.parent = parent;
	vdev->dev.bus = &vio_bus_type;
	vdev->dev.release = vio_dev_release;

	if (parent == NULL) {
		dp = cdev_node;
	} else if (to_vio_dev(parent) == root_vdev) {
		dp = of_get_next_child(cdev_node, NULL);
		while (dp) {
			if (!strcmp(dp->type, type))
				break;

			dp = of_get_next_child(cdev_node, dp);
		}
	} else {
		dp = to_vio_dev(parent)->dp;
	}
	vdev->dp = dp;

	/*
	 * node_name is NULL for the parent/channel-devices node and
	 * the parent doesn't require the MD node info.
	 */
	if (node_name != NULL) {
		(void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
				node_name);

		err = mdesc_get_node_info(hp, mp, node_name,
					  &vdev->md_node_info);
		if (err) {
			pr_err("VIO: Could not get MD node info %s, err=%d\n",
			       dev_name(&vdev->dev), err);
			kfree(vdev);
			return NULL;
		}
	}

	pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
		dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);

	err = device_register(&vdev->dev);
	if (err) {
		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
		       dev_name(&vdev->dev), err);
		put_device(&vdev->dev);
		return NULL;
	}
	if (vdev->dp)
		err = sysfs_create_file(&vdev->dev.kobj,
					&dev_attr_obppath.attr);

	return vdev;
}

static void vio_add(struct mdesc_handle *hp, u64 node,
		    const char *node_name)
{
	(void) vio_create_one(hp, node, node_name, &root_vdev->dev);
}

struct vio_remove_node_data {
	struct mdesc_handle *hp;
	u64 node;
};

static int vio_md_node_match(struct device *dev, void *arg)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_remove_node_data *node_data;
	u64 node;

	node_data = (struct vio_remove_node_data *)arg;

	node = vio_vdev_node(node_data->hp, vdev);

	if (node == node_data->node)
		return 1;
	else
		return 0;
}

static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
{
	struct vio_remove_node_data node_data;
	struct device *dev;

	node_data.hp = hp;
	node_data.node = node;

	dev = device_find_child(&root_vdev->dev, (void *)&node_data,
				vio_md_node_match);
	if (dev) {
		printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));

		device_unregister(dev);
		put_device(dev);
	} else {
		pr_err("VIO: %s node not found in MDESC\n", node_name);
	}
}

static struct mdesc_notifier_client vio_device_notifier = {
	.add		= vio_add,
	.remove		= vio_remove,
	.node_name	= "virtual-device-port",
};

/* We are only interested in domain service ports under the
 * "domain-services" node.  On control nodes there is another port
 * under "openboot" that we should not mess with as aparently that is
 * reserved exclusively for OBP use.
 */
static void vio_add_ds(struct mdesc_handle *hp, u64 node,
		       const char *node_name)
{
	int found;
	u64 a;

	found = 0;
	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
		u64 target = mdesc_arc_target(hp, a);
		const char *name = mdesc_node_name(hp, target);

		if (!strcmp(name, "domain-services")) {
			found = 1;
			break;
		}
	}

	if (found)
		(void) vio_create_one(hp, node, node_name, &root_vdev->dev);
}

static struct mdesc_notifier_client vio_ds_notifier = {
	.add		= vio_add_ds,
	.remove		= vio_remove,
	.node_name	= "domain-services-port",
};

static const char *channel_devices_node = "channel-devices";
static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
static const char *cfg_handle_prop = "cfg-handle";

static int __init vio_init(void)
{
	struct mdesc_handle *hp;
	const char *compat;
	const u64 *cfg_handle;
	int err, len;
	u64 root;

	err = bus_register(&vio_bus_type);
	if (err) {
		printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
		       err);
		return err;
	}

	hp = mdesc_grab();
	if (!hp)
		return 0;

	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
	if (root == MDESC_NODE_NULL) {
		printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
		mdesc_release(hp);
		return 0;
	}

	cdev_node = of_find_node_by_name(NULL, "channel-devices");
	err = -ENODEV;
	if (!cdev_node) {
		printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
		goto out_release;
	}

	compat = mdesc_get_property(hp, root, "compatible", &len);
	if (!compat) {
		printk(KERN_ERR "VIO: Channel devices lacks compatible "
		       "property\n");
		goto out_release;
	}
	if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
		printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
		       "compat entry.\n", channel_devices_compat);
		goto out_release;
	}

	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
	if (!cfg_handle) {
		printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
		       cfg_handle_prop);
		goto out_release;
	}

	cdev_cfg_handle = *cfg_handle;

	root_vdev = vio_create_one(hp, root, NULL, NULL);
	err = -ENODEV;
	if (!root_vdev) {
		printk(KERN_ERR "VIO: Could not create root device.\n");
		goto out_release;
	}

	mdesc_register_notifier(&vio_device_notifier);
	mdesc_register_notifier(&vio_ds_notifier);

	mdesc_release(hp);

	return err;

out_release:
	mdesc_release(hp);
	return err;
}

postcore_initcall(vio_init);
OpenPOWER on IntegriCloud