summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/powernv/opal-dump.c
blob: 4c827826c05eb13b09f4e0cd9f9c73d6967ec9a9 (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
/*
 * PowerNV OPAL Dump Interface
 *
 * Copyright 2013,2014 IBM Corp.
 *
 * 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.
 */

#include <linux/kobject.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include <asm/opal.h>

#define DUMP_TYPE_FSP	0x01

struct dump_obj {
	struct kobject  kobj;
	struct bin_attribute dump_attr;
	uint32_t	id;  /* becomes object name */
	uint32_t	type;
	uint32_t	size;
	char		*buffer;
};
#define to_dump_obj(x) container_of(x, struct dump_obj, kobj)

struct dump_attribute {
	struct attribute attr;
	ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr,
			char *buf);
	ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr,
			 const char *buf, size_t count);
};
#define to_dump_attr(x) container_of(x, struct dump_attribute, attr)

static ssize_t dump_id_show(struct dump_obj *dump_obj,
			    struct dump_attribute *attr,
			    char *buf)
{
	return sprintf(buf, "0x%x\n", dump_obj->id);
}

static const char* dump_type_to_string(uint32_t type)
{
	switch (type) {
	case 0x01: return "SP Dump";
	case 0x02: return "System/Platform Dump";
	case 0x03: return "SMA Dump";
	default: return "unknown";
	}
}

static ssize_t dump_type_show(struct dump_obj *dump_obj,
			      struct dump_attribute *attr,
			      char *buf)
{

	return sprintf(buf, "0x%x %s\n", dump_obj->type,
		       dump_type_to_string(dump_obj->type));
}

static ssize_t dump_ack_show(struct dump_obj *dump_obj,
			     struct dump_attribute *attr,
			     char *buf)
{
	return sprintf(buf, "ack - acknowledge dump\n");
}

/*
 * Send acknowledgement to OPAL
 */
static int64_t dump_send_ack(uint32_t dump_id)
{
	int rc;

	rc = opal_dump_ack(dump_id);
	if (rc)
		pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n",
			__func__, dump_id, rc);
	return rc;
}

static ssize_t dump_ack_store(struct dump_obj *dump_obj,
			      struct dump_attribute *attr,
			      const char *buf,
			      size_t count)
{
	dump_send_ack(dump_obj->id);
	sysfs_remove_file_self(&dump_obj->kobj, &attr->attr);
	kobject_put(&dump_obj->kobj);
	return count;
}

/* Attributes of a dump
 * The binary attribute of the dump itself is dynamic
 * due to the dynamic size of the dump
 */
static struct dump_attribute id_attribute =
	__ATTR(id, S_IRUGO, dump_id_show, NULL);
static struct dump_attribute type_attribute =
	__ATTR(type, S_IRUGO, dump_type_show, NULL);
static struct dump_attribute ack_attribute =
	__ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);

static ssize_t init_dump_show(struct dump_obj *dump_obj,
			      struct dump_attribute *attr,
			      char *buf)
{
	return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
}

static int64_t dump_fips_init(uint8_t type)
{
	int rc;

	rc = opal_dump_init(type);
	if (rc)
		pr_warn("%s: Failed to initiate FSP dump (%d)\n",
			__func__, rc);
	return rc;
}

static ssize_t init_dump_store(struct dump_obj *dump_obj,
			       struct dump_attribute *attr,
			       const char *buf,
			       size_t count)
{
	int rc;

	rc = dump_fips_init(DUMP_TYPE_FSP);
	if (rc == OPAL_SUCCESS)
		pr_info("%s: Initiated FSP dump\n", __func__);

	return count;
}

static struct dump_attribute initiate_attribute =
	__ATTR(initiate_dump, 0600, init_dump_show, init_dump_store);

static struct attribute *initiate_attrs[] = {
	&initiate_attribute.attr,
	NULL,
};

static struct attribute_group initiate_attr_group = {
	.attrs = initiate_attrs,
};

static struct kset *dump_kset;

static ssize_t dump_attr_show(struct kobject *kobj,
			      struct attribute *attr,
			      char *buf)
{
	struct dump_attribute *attribute;
	struct dump_obj *dump;

	attribute = to_dump_attr(attr);
	dump = to_dump_obj(kobj);

	if (!attribute->show)
		return -EIO;

	return attribute->show(dump, attribute, buf);
}

static ssize_t dump_attr_store(struct kobject *kobj,
			       struct attribute *attr,
			       const char *buf, size_t len)
{
	struct dump_attribute *attribute;
	struct dump_obj *dump;

	attribute = to_dump_attr(attr);
	dump = to_dump_obj(kobj);

	if (!attribute->store)
		return -EIO;

	return attribute->store(dump, attribute, buf, len);
}

static const struct sysfs_ops dump_sysfs_ops = {
	.show = dump_attr_show,
	.store = dump_attr_store,
};

static void dump_release(struct kobject *kobj)
{
	struct dump_obj *dump;

	dump = to_dump_obj(kobj);
	vfree(dump->buffer);
	kfree(dump);
}

static struct attribute *dump_default_attrs[] = {
	&id_attribute.attr,
	&type_attribute.attr,
	&ack_attribute.attr,
	NULL,
};

static struct kobj_type dump_ktype = {
	.sysfs_ops = &dump_sysfs_ops,
	.release = &dump_release,
	.default_attrs = dump_default_attrs,
};

static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type)
{
	__be32 id, size, type;
	int rc;

	type = cpu_to_be32(0xffffffff);

	rc = opal_dump_info2(&id, &size, &type);
	if (rc == OPAL_PARAMETER)
		rc = opal_dump_info(&id, &size);

	*dump_id = be32_to_cpu(id);
	*dump_size = be32_to_cpu(size);
	*dump_type = be32_to_cpu(type);

	if (rc)
		pr_warn("%s: Failed to get dump info (%d)\n",
			__func__, rc);
	return rc;
}

static int64_t dump_read_data(struct dump_obj *dump)
{
	struct opal_sg_list *list;
	uint64_t addr;
	int64_t rc;

	/* Allocate memory */
	dump->buffer = vzalloc(PAGE_ALIGN(dump->size));
	if (!dump->buffer) {
		pr_err("%s : Failed to allocate memory\n", __func__);
		rc = -ENOMEM;
		goto out;
	}

	/* Generate SG list */
	list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
	if (!list) {
		rc = -ENOMEM;
		goto out;
	}

	/* First entry address */
	addr = __pa(list);

	/* Fetch data */
	rc = OPAL_BUSY_EVENT;
	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
		rc = opal_dump_read(dump->id, addr);
		if (rc == OPAL_BUSY_EVENT) {
			opal_poll_events(NULL);
			msleep(20);
		}
	}

	if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL)
		pr_warn("%s: Extract dump failed for ID 0x%x\n",
			__func__, dump->id);

	/* Free SG list */
	opal_free_sg_list(list);

out:
	return rc;
}

static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj,
			      struct bin_attribute *bin_attr,
			      char *buffer, loff_t pos, size_t count)
{
	ssize_t rc;

	struct dump_obj *dump = to_dump_obj(kobj);

	if (!dump->buffer) {
		rc = dump_read_data(dump);

		if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) {
			vfree(dump->buffer);
			dump->buffer = NULL;

			return -EIO;
		}
		if (rc == OPAL_PARTIAL) {
			/* On a partial read, we just return EIO
			 * and rely on userspace to ask us to try
			 * again.
			 */
			pr_info("%s: Platform dump partially read. ID = 0x%x\n",
				__func__, dump->id);
			return -EIO;
		}
	}

	memcpy(buffer, dump->buffer + pos, count);

	/* You may think we could free the dump buffer now and retrieve
	 * it again later if needed, but due to current firmware limitation,
	 * that's not the case. So, once read into userspace once,
	 * we keep the dump around until it's acknowledged by userspace.
	 */

	return count;
}

static struct dump_obj *create_dump_obj(uint32_t id, size_t size,
					uint32_t type)
{
	struct dump_obj *dump;
	int rc;

	dump = kzalloc(sizeof(*dump), GFP_KERNEL);
	if (!dump)
		return NULL;

	dump->kobj.kset = dump_kset;

	kobject_init(&dump->kobj, &dump_ktype);

	sysfs_bin_attr_init(&dump->dump_attr);

	dump->dump_attr.attr.name = "dump";
	dump->dump_attr.attr.mode = 0400;
	dump->dump_attr.size = size;
	dump->dump_attr.read = dump_attr_read;

	dump->id = id;
	dump->size = size;
	dump->type = type;

	rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id);
	if (rc) {
		kobject_put(&dump->kobj);
		return NULL;
	}

	rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr);
	if (rc) {
		kobject_put(&dump->kobj);
		return NULL;
	}

	pr_info("%s: New platform dump. ID = 0x%x Size %u\n",
		__func__, dump->id, dump->size);

	kobject_uevent(&dump->kobj, KOBJ_ADD);

	return dump;
}

static irqreturn_t process_dump(int irq, void *data)
{
	int rc;
	uint32_t dump_id, dump_size, dump_type;
	struct dump_obj *dump;
	char name[22];
	struct kobject *kobj;

	rc = dump_read_info(&dump_id, &dump_size, &dump_type);
	if (rc != OPAL_SUCCESS)
		return rc;

	sprintf(name, "0x%x-0x%x", dump_type, dump_id);

	/* we may get notified twice, let's handle
	 * that gracefully and not create two conflicting
	 * entries.
	 */
	kobj = kset_find_obj(dump_kset, name);
	if (kobj) {
		/* Drop reference added by kset_find_obj() */
		kobject_put(kobj);
		return 0;
	}

	dump = create_dump_obj(dump_id, dump_size, dump_type);
	if (!dump)
		return -1;

	return IRQ_HANDLED;
}

void __init opal_platform_dump_init(void)
{
	int rc;
	int dump_irq;

	/* ELOG not supported by firmware */
	if (!opal_check_token(OPAL_DUMP_READ))
		return;

	dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
	if (!dump_kset) {
		pr_warn("%s: Failed to create dump kset\n", __func__);
		return;
	}

	rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group);
	if (rc) {
		pr_warn("%s: Failed to create initiate dump attr group\n",
			__func__);
		kobject_put(&dump_kset->kobj);
		return;
	}

	dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL));
	if (!dump_irq) {
		pr_err("%s: Can't register OPAL event irq (%d)\n",
		       __func__, dump_irq);
		return;
	}

	rc = request_threaded_irq(dump_irq, NULL, process_dump,
				IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
				"opal-dump", NULL);
	if (rc) {
		pr_err("%s: Can't request OPAL event irq (%d)\n",
		       __func__, rc);
		return;
	}

	if (opal_check_token(OPAL_DUMP_RESEND))
		opal_dump_resend_notification();
}
OpenPOWER on IntegriCloud