summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/iseries/vio.c
blob: 657b72f68493f63190fed4184e82d6cae427bfc8 (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
/*
 * Legacy iSeries specific vio initialisation
 * that needs to be built in (not a module).
 *
 * © Copyright 2007 IBM Corporation
 *	Author: Stephen Rothwell
 *	Some parts collected from various other files
 *
 * This program is free software;  you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/of.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/module.h>

#include <asm/firmware.h>
#include <asm/vio.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/iommu.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>

#define FIRST_VTY	0
#define NUM_VTYS	1
#define FIRST_VSCSI	(FIRST_VTY + NUM_VTYS)
#define NUM_VSCSIS	1
#define FIRST_VLAN	(FIRST_VSCSI + NUM_VSCSIS)
#define NUM_VLANS	HVMAXARCHITECTEDVIRTUALLANS
#define FIRST_VIODASD	(FIRST_VLAN + NUM_VLANS)
#define NUM_VIODASDS	HVMAXARCHITECTEDVIRTUALDISKS
#define FIRST_VIOCD	(FIRST_VIODASD + NUM_VIODASDS)
#define NUM_VIOCDS	HVMAXARCHITECTEDVIRTUALCDROMS
#define FIRST_VIOTAPE	(FIRST_VIOCD + NUM_VIOCDS)
#define NUM_VIOTAPES	HVMAXARCHITECTEDVIRTUALTAPES

struct vio_waitevent {
	struct completion	com;
	int			rc;
	u16			sub_result;
};

struct vio_resource {
	char	rsrcname[10];
	char	type[4];
	char	model[3];
};

static struct property *new_property(const char *name, int length,
		const void *value)
{
	struct property *np = kzalloc(sizeof(*np) + strlen(name) + 1 + length,
			GFP_KERNEL);

	if (!np)
		return NULL;
	np->name = (char *)(np + 1);
	np->value = np->name + strlen(name) + 1;
	strcpy(np->name, name);
	memcpy(np->value, value, length);
	np->length = length;
	return np;
}

static void free_property(struct property *np)
{
	kfree(np);
}

static struct device_node *new_node(const char *path,
		struct device_node *parent)
{
	struct device_node *np = kzalloc(sizeof(*np), GFP_KERNEL);

	if (!np)
		return NULL;
	np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL);
	if (!np->full_name) {
		kfree(np);
		return NULL;
	}
	strcpy(np->full_name, path);
	of_node_set_flag(np, OF_DYNAMIC);
	kref_init(&np->kref);
	np->parent = of_node_get(parent);
	return np;
}

static void free_node(struct device_node *np)
{
	struct property *next;
	struct property *prop;

	next = np->properties;
	while (next) {
		prop = next;
		next = prop->next;
		free_property(prop);
	}
	of_node_put(np->parent);
	kfree(np->full_name);
	kfree(np);
}

static int add_string_property(struct device_node *np, const char *name,
		const char *value)
{
	struct property *nprop = new_property(name, strlen(value) + 1, value);

	if (!nprop)
		return 0;
	prom_add_property(np, nprop);
	return 1;
}

static int add_raw_property(struct device_node *np, const char *name,
		int length, const void *value)
{
	struct property *nprop = new_property(name, length, value);

	if (!nprop)
		return 0;
	prom_add_property(np, nprop);
	return 1;
}

static struct device_node *do_device_node(struct device_node *parent,
		const char *name, u32 reg, u32 unit, const char *type,
		const char *compat, struct vio_resource *res)
{
	struct device_node *np;
	char path[32];

	snprintf(path, sizeof(path), "/vdevice/%s@%08x", name, reg);
	np = new_node(path, parent);
	if (!np)
		return NULL;
	if (!add_string_property(np, "name", name) ||
		!add_string_property(np, "device_type", type) ||
		!add_string_property(np, "compatible", compat) ||
		!add_raw_property(np, "reg", sizeof(reg), &reg) ||
		!add_raw_property(np, "linux,unit_address",
			sizeof(unit), &unit)) {
		goto node_free;
	}
	if (res) {
		if (!add_raw_property(np, "linux,vio_rsrcname",
				sizeof(res->rsrcname), res->rsrcname) ||
			!add_raw_property(np, "linux,vio_type",
				sizeof(res->type), res->type) ||
			!add_raw_property(np, "linux,vio_model",
				sizeof(res->model), res->model))
			goto node_free;
	}
	np->name = of_get_property(np, "name", NULL);
	np->type = of_get_property(np, "device_type", NULL);
	of_attach_node(np);
#ifdef CONFIG_PROC_DEVICETREE
	if (parent->pde) {
		struct proc_dir_entry *ent;

		ent = proc_mkdir(strrchr(np->full_name, '/') + 1, parent->pde);
		if (ent)
			proc_device_tree_add_node(np, ent);
	}
#endif
	return np;

 node_free:
	free_node(np);
	return NULL;
}

/*
 * This is here so that we can dynamically add viodasd
 * devices without exposing all the above infrastructure.
 */
struct vio_dev *vio_create_viodasd(u32 unit)
{
	struct device_node *vio_root;
	struct device_node *np;
	struct vio_dev *vdev = NULL;

	vio_root = of_find_node_by_path("/vdevice");
	if (!vio_root)
		return NULL;
	np = do_device_node(vio_root, "viodasd", FIRST_VIODASD + unit, unit,
			"block", "IBM,iSeries-viodasd", NULL);
	of_node_put(vio_root);
	if (np) {
		vdev = vio_register_device_node(np);
		if (!vdev)
			free_node(np);
	}
	return vdev;
}
EXPORT_SYMBOL_GPL(vio_create_viodasd);

static void __init handle_block_event(struct HvLpEvent *event)
{
	struct vioblocklpevent *bevent = (struct vioblocklpevent *)event;
	struct vio_waitevent *pwe;

	if (event == NULL)
		/* Notification that a partition went away! */
		return;
	/* First, we should NEVER get an int here...only acks */
	if (hvlpevent_is_int(event)) {
		printk(KERN_WARNING "handle_viod_request: "
		       "Yikes! got an int in viodasd event handler!\n");
		if (hvlpevent_need_ack(event)) {
			event->xRc = HvLpEvent_Rc_InvalidSubtype;
			HvCallEvent_ackLpEvent(event);
		}
		return;
	}

	switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
	case vioblockopen:
		/*
		 * Handle a response to an open request.  We get all the
		 * disk information in the response, so update it.  The
		 * correlation token contains a pointer to a waitevent
		 * structure that has a completion in it.  update the
		 * return code in the waitevent structure and post the
		 * completion to wake up the guy who sent the request
		 */
		pwe = (struct vio_waitevent *)event->xCorrelationToken;
		pwe->rc = event->xRc;
		pwe->sub_result = bevent->sub_result;
		complete(&pwe->com);
		break;
	case vioblockclose:
		break;
	default:
		printk(KERN_WARNING "handle_viod_request: unexpected subtype!");
		if (hvlpevent_need_ack(event)) {
			event->xRc = HvLpEvent_Rc_InvalidSubtype;
			HvCallEvent_ackLpEvent(event);
		}
	}
}

static void __init probe_disk(struct device_node *vio_root, u32 unit)
{
	HvLpEvent_Rc hvrc;
	struct vio_waitevent we;
	u16 flags = 0;

retry:
	init_completion(&we.com);

	/* Send the open event to OS/400 */
	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_blockio | vioblockopen,
			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)(unsigned long)&we, VIOVERSION << 16,
			((u64)unit << 48) | ((u64)flags<< 32),
			0, 0, 0);
	if (hvrc != 0) {
		printk(KERN_WARNING "probe_disk: bad rc on HV open %d\n",
			(int)hvrc);
		return;
	}

	wait_for_completion(&we.com);

	if (we.rc != 0) {
		if (flags != 0)
			return;
		/* try again with read only flag set */
		flags = vioblockflags_ro;
		goto retry;
	}

	/* Send the close event to OS/400.  We DON'T expect a response */
	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_blockio | vioblockclose,
			HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			0, VIOVERSION << 16,
			((u64)unit << 48) | ((u64)flags << 32),
			0, 0, 0);
	if (hvrc != 0) {
		printk(KERN_WARNING "probe_disk: "
		       "bad rc sending event to OS/400 %d\n", (int)hvrc);
		return;
	}

	do_device_node(vio_root, "viodasd", FIRST_VIODASD + unit, unit,
			"block", "IBM,iSeries-viodasd", NULL);
}

static void __init get_viodasd_info(struct device_node *vio_root)
{
	int rc;
	u32 unit;

	rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio, 2);
	if (rc) {
		printk(KERN_WARNING "get_viodasd_info: "
		       "error opening path to host partition %d\n",
		       viopath_hostLp);
		return;
	}

	/* Initialize our request handler */
	vio_setHandler(viomajorsubtype_blockio, handle_block_event);

	for (unit = 0; unit < HVMAXARCHITECTEDVIRTUALDISKS; unit++)
		probe_disk(vio_root, unit);

	vio_clearHandler(viomajorsubtype_blockio);
	viopath_close(viopath_hostLp, viomajorsubtype_blockio, 2);
}

static void __init handle_cd_event(struct HvLpEvent *event)
{
	struct viocdlpevent *bevent;
	struct vio_waitevent *pwe;

	if (!event)
		/* Notification that a partition went away! */
		return;

	/* First, we should NEVER get an int here...only acks */
	if (hvlpevent_is_int(event)) {
		printk(KERN_WARNING "handle_cd_event: got an unexpected int\n");
		if (hvlpevent_need_ack(event)) {
			event->xRc = HvLpEvent_Rc_InvalidSubtype;
			HvCallEvent_ackLpEvent(event);
		}
		return;
	}

	bevent = (struct viocdlpevent *)event;

	switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
	case viocdgetinfo:
		pwe = (struct vio_waitevent *)event->xCorrelationToken;
		pwe->rc = event->xRc;
		pwe->sub_result = bevent->sub_result;
		complete(&pwe->com);
		break;

	default:
		printk(KERN_WARNING "handle_cd_event: "
			"message with unexpected subtype %0x04X!\n",
			event->xSubtype & VIOMINOR_SUBTYPE_MASK);
		if (hvlpevent_need_ack(event)) {
			event->xRc = HvLpEvent_Rc_InvalidSubtype;
			HvCallEvent_ackLpEvent(event);
		}
	}
}

static void __init get_viocd_info(struct device_node *vio_root)
{
	HvLpEvent_Rc hvrc;
	u32 unit;
	struct vio_waitevent we;
	struct vio_resource *unitinfo;
	dma_addr_t unitinfo_dmaaddr;
	int ret;

	ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio, 2);
	if (ret) {
		printk(KERN_WARNING
			"get_viocd_info: error opening path to host partition %d\n",
			viopath_hostLp);
		return;
	}

	/* Initialize our request handler */
	vio_setHandler(viomajorsubtype_cdio, handle_cd_event);

	unitinfo = iseries_hv_alloc(
			sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS,
			&unitinfo_dmaaddr, GFP_ATOMIC);
	if (!unitinfo) {
		printk(KERN_WARNING
			"get_viocd_info: error allocating unitinfo\n");
		goto clear_handler;
	}

	memset(unitinfo, 0, sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS);

	init_completion(&we.com);

	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_cdio | viocdgetinfo,
			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
			sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS, 0);
	if (hvrc != HvLpEvent_Rc_Good) {
		printk(KERN_WARNING
			"get_viocd_info: cdrom error sending event. rc %d\n",
			(int)hvrc);
		goto hv_free;
	}

	wait_for_completion(&we.com);

	if (we.rc) {
		printk(KERN_WARNING "get_viocd_info: bad rc %d:0x%04X\n",
			we.rc, we.sub_result);
		goto hv_free;
	}

	for (unit = 0; (unit < HVMAXARCHITECTEDVIRTUALCDROMS) &&
			unitinfo[unit].rsrcname[0]; unit++) {
		if (!do_device_node(vio_root, "viocd", FIRST_VIOCD + unit, unit,
				"block", "IBM,iSeries-viocd", &unitinfo[unit]))
			break;
	}

 hv_free:
	iseries_hv_free(sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS,
			unitinfo, unitinfo_dmaaddr);
 clear_handler:
	vio_clearHandler(viomajorsubtype_cdio);
	viopath_close(viopath_hostLp, viomajorsubtype_cdio, 2);
}

/* Handle interrupt events for tape */
static void __init handle_tape_event(struct HvLpEvent *event)
{
	struct vio_waitevent *we;
	struct viotapelpevent *tevent = (struct viotapelpevent *)event;

	if (event == NULL)
		/* Notification that a partition went away! */
		return;

	we = (struct vio_waitevent *)event->xCorrelationToken;
	switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
	case viotapegetinfo:
		we->rc = tevent->sub_type_result;
		complete(&we->com);
		break;
	default:
		printk(KERN_WARNING "handle_tape_event: weird ack\n");
	}
}

static void __init get_viotape_info(struct device_node *vio_root)
{
	HvLpEvent_Rc hvrc;
	u32 unit;
	struct vio_resource *unitinfo;
	dma_addr_t unitinfo_dmaaddr;
	size_t len = sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALTAPES;
	struct vio_waitevent we;
	int ret;

	ret = viopath_open(viopath_hostLp, viomajorsubtype_tape, 2);
	if (ret) {
		printk(KERN_WARNING "get_viotape_info: "
			"error on viopath_open to hostlp %d\n", ret);
		return;
	}

	vio_setHandler(viomajorsubtype_tape, handle_tape_event);

	unitinfo = iseries_hv_alloc(len, &unitinfo_dmaaddr, GFP_ATOMIC);
	if (!unitinfo)
		goto clear_handler;

	memset(unitinfo, 0, len);

	hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
			HvLpEvent_Type_VirtualIo,
			viomajorsubtype_tape | viotapegetinfo,
			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
			viopath_sourceinst(viopath_hostLp),
			viopath_targetinst(viopath_hostLp),
			(u64)(unsigned long)&we, VIOVERSION << 16,
			unitinfo_dmaaddr, len, 0, 0);
	if (hvrc != HvLpEvent_Rc_Good) {
		printk(KERN_WARNING "get_viotape_info: hv error on op %d\n",
				(int)hvrc);
		goto hv_free;
	}

	wait_for_completion(&we.com);

	for (unit = 0; (unit < HVMAXARCHITECTEDVIRTUALTAPES) &&
			unitinfo[unit].rsrcname[0]; unit++) {
		if (!do_device_node(vio_root, "viotape", FIRST_VIOTAPE + unit,
				unit, "byte", "IBM,iSeries-viotape",
				&unitinfo[unit]))
			break;
	}

 hv_free:
	iseries_hv_free(len, unitinfo, unitinfo_dmaaddr);
 clear_handler:
	vio_clearHandler(viomajorsubtype_tape);
	viopath_close(viopath_hostLp, viomajorsubtype_tape, 2);
}

static int __init iseries_vio_init(void)
{
	struct device_node *vio_root;
	int ret = -ENODEV;

	if (!firmware_has_feature(FW_FEATURE_ISERIES))
		goto out;

	iommu_vio_init();

	vio_root = of_find_node_by_path("/vdevice");
	if (!vio_root)
		goto out;

	if (viopath_hostLp == HvLpIndexInvalid) {
		vio_set_hostlp();
		/* If we don't have a host, bail out */
		if (viopath_hostLp == HvLpIndexInvalid)
			goto put_node;
	}

	get_viodasd_info(vio_root);
	get_viocd_info(vio_root);
	get_viotape_info(vio_root);

	ret = 0;

 put_node:
	of_node_put(vio_root);
 out:
	return ret;
}
arch_initcall(iseries_vio_init);