[deliverable/linux.git] / arch / powerpc / platforms / powernv / opal-dump.c

/*
 * 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();
}
Commit	Line	Data
c7e64b9c SS	1	/*
	2	* PowerNV OPAL Dump Interface
	3	*
	4	* Copyright 2013,2014 IBM Corp.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/kobject.h>
	13	#include <linux/mm.h>
	14	#include <linux/slab.h>
	15	#include <linux/vmalloc.h>
	16	#include <linux/pagemap.h>
	17	#include <linux/delay.h>
8034f715	18	#include <linux/interrupt.h>
c7e64b9c SS	19
	20	#include <asm/opal.h>
	21
	22	#define DUMP_TYPE_FSP 0x01
	23
	24	struct dump_obj {
	25	struct kobject kobj;
	26	struct bin_attribute dump_attr;
	27	uint32_t id; /* becomes object name */
	28	uint32_t type;
	29	uint32_t size;
	30	char *buffer;
	31	};
	32	#define to_dump_obj(x) container_of(x, struct dump_obj, kobj)
	33
	34	struct dump_attribute {
	35	struct attribute attr;
	36	ssize_t (show)(struct dump_obj dump, struct dump_attribute *attr,
	37	char *buf);
	38	ssize_t (store)(struct dump_obj dump, struct dump_attribute *attr,
	39	const char *buf, size_t count);
	40	};
	41	#define to_dump_attr(x) container_of(x, struct dump_attribute, attr)
	42
	43	static ssize_t dump_id_show(struct dump_obj *dump_obj,
	44	struct dump_attribute *attr,
	45	char *buf)
	46	{
	47	return sprintf(buf, "0x%x\n", dump_obj->id);
	48	}
	49
	50	static const char* dump_type_to_string(uint32_t type)
	51	{
	52	switch (type) {
	53	case 0x01: return "SP Dump";
	54	case 0x02: return "System/Platform Dump";
	55	case 0x03: return "SMA Dump";
	56	default: return "unknown";
	57	}
	58	}
	59
	60	static ssize_t dump_type_show(struct dump_obj *dump_obj,
	61	struct dump_attribute *attr,
	62	char *buf)
	63	{
8034f715	64
c7e64b9c SS	65	return sprintf(buf, "0x%x %s\n", dump_obj->type,
	66	dump_type_to_string(dump_obj->type));
	67	}
	68
	69	static ssize_t dump_ack_show(struct dump_obj *dump_obj,
	70	struct dump_attribute *attr,
	71	char *buf)
	72	{
	73	return sprintf(buf, "ack - acknowledge dump\n");
	74	}
	75
	76	/*
	77	* Send acknowledgement to OPAL
	78	*/
	79	static int64_t dump_send_ack(uint32_t dump_id)
	80	{
	81	int rc;
	82
	83	rc = opal_dump_ack(dump_id);
	84	if (rc)
	85	pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n",
	86	__func__, dump_id, rc);
	87	return rc;
	88	}
	89
c7e64b9c SS	90	static ssize_t dump_ack_store(struct dump_obj *dump_obj,
	91	struct dump_attribute *attr,
	92	const char *buf,
	93	size_t count)
	94	{
	95	dump_send_ack(dump_obj->id);
cc4f265a SS	96	sysfs_remove_file_self(&dump_obj->kobj, &attr->attr);
cc4f265a SS	97	kobject_put(&dump_obj->kobj);
c7e64b9c SS	98	return count;
	99	}
	100
	101	/* Attributes of a dump
	102	* The binary attribute of the dump itself is dynamic
	103	* due to the dynamic size of the dump
	104	*/
	105	static struct dump_attribute id_attribute =
76215b04	106	__ATTR(id, S_IRUGO, dump_id_show, NULL);
c7e64b9c	107	static struct dump_attribute type_attribute =
76215b04	108	__ATTR(type, S_IRUGO, dump_type_show, NULL);
c7e64b9c SS	109	static struct dump_attribute ack_attribute =
	110	__ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);
	111
	112	static ssize_t init_dump_show(struct dump_obj *dump_obj,
	113	struct dump_attribute *attr,
	114	char *buf)
	115	{
cdd91b89	116	return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
c7e64b9c SS	117	}
	118
	119	static int64_t dump_fips_init(uint8_t type)
	120	{
	121	int rc;
	122
	123	rc = opal_dump_init(type);
	124	if (rc)
cdd91b89	125	pr_warn("%s: Failed to initiate FSP dump (%d)\n",
c7e64b9c SS	126	__func__, rc);
	127	return rc;
	128	}
	129
	130	static ssize_t init_dump_store(struct dump_obj *dump_obj,
	131	struct dump_attribute *attr,
	132	const char *buf,
	133	size_t count)
	134	{
cdd91b89 VH	135	int rc;
	136
	137	rc = dump_fips_init(DUMP_TYPE_FSP);
	138	if (rc == OPAL_SUCCESS)
	139	pr_info("%s: Initiated FSP dump\n", __func__);
	140
c7e64b9c SS	141	return count;
	142	}
	143
	144	static struct dump_attribute initiate_attribute =
	145	__ATTR(initiate_dump, 0600, init_dump_show, init_dump_store);
	146
	147	static struct attribute *initiate_attrs[] = {
	148	&initiate_attribute.attr,
	149	NULL,
	150	};
	151
	152	static struct attribute_group initiate_attr_group = {
	153	.attrs = initiate_attrs,
	154	};
	155
	156	static struct kset *dump_kset;
	157
	158	static ssize_t dump_attr_show(struct kobject *kobj,
	159	struct attribute *attr,
	160	char *buf)
	161	{
	162	struct dump_attribute *attribute;
	163	struct dump_obj *dump;
	164
	165	attribute = to_dump_attr(attr);
	166	dump = to_dump_obj(kobj);
	167
	168	if (!attribute->show)
	169	return -EIO;
	170
	171	return attribute->show(dump, attribute, buf);
	172	}
	173
	174	static ssize_t dump_attr_store(struct kobject *kobj,
	175	struct attribute *attr,
	176	const char *buf, size_t len)
	177	{
	178	struct dump_attribute *attribute;
	179	struct dump_obj *dump;
	180
	181	attribute = to_dump_attr(attr);
	182	dump = to_dump_obj(kobj);
	183
	184	if (!attribute->store)
	185	return -EIO;
	186
	187	return attribute->store(dump, attribute, buf, len);
	188	}
	189
	190	static const struct sysfs_ops dump_sysfs_ops = {
	191	.show = dump_attr_show,
	192	.store = dump_attr_store,
	193	};
	194
	195	static void dump_release(struct kobject *kobj)
	196	{
	197	struct dump_obj *dump;
	198
	199	dump = to_dump_obj(kobj);
	200	vfree(dump->buffer);
	201	kfree(dump);
	202	}
	203
	204	static struct attribute *dump_default_attrs[] = {
205	&id_attribute.attr,
206	&type_attribute.attr,
207	&ack_attribute.attr,
208	NULL,
209	};
210
211	static struct kobj_type dump_ktype = {
212	.sysfs_ops = &dump_sysfs_ops,
213	.release = &dump_release,
214	.default_attrs = dump_default_attrs,
215	};
216
2d6b63bb	217	static int64_t dump_read_info(uint32_t dump_id, uint32_t dump_size, uint32_t *dump_type)
c7e64b9c	218	{
2d6b63bb	219	__be32 id, size, type;
c7e64b9c	220	int rc;
c7e64b9c	221
2d6b63bb	222	type = cpu_to_be32(0xffffffff);
c7e64b9c	223
2d6b63bb	224	rc = opal_dump_info2(&id, &size, &type);
c7e64b9c	225	if (rc == OPAL_PARAMETER)
2d6b63bb AB	226	rc = opal_dump_info(&id, &size);
	227
	228	*dump_id = be32_to_cpu(id);
	229	*dump_size = be32_to_cpu(size);
	230	*dump_type = be32_to_cpu(type);
c7e64b9c SS	231
	232	if (rc)
	233	pr_warn("%s: Failed to get dump info (%d)\n",
	234	__func__, rc);
	235	return rc;
	236	}
	237
	238	static int64_t dump_read_data(struct dump_obj *dump)
	239	{
	240	struct opal_sg_list *list;
	241	uint64_t addr;
	242	int64_t rc;
	243
	244	/* Allocate memory */
	245	dump->buffer = vzalloc(PAGE_ALIGN(dump->size));
	246	if (!dump->buffer) {
	247	pr_err("%s : Failed to allocate memory\n", __func__);
	248	rc = -ENOMEM;
	249	goto out;
	250	}
	251
	252	/* Generate SG list */
3441f04b	253	list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
c7e64b9c SS	254	if (!list) {
	255	rc = -ENOMEM;
	256	goto out;
	257	}
	258
c7e64b9c SS	259	/* First entry address */
	260	addr = __pa(list);
	261
	262	/* Fetch data */
	263	rc = OPAL_BUSY_EVENT;
	264	while (rc == OPAL_BUSY \|\| rc == OPAL_BUSY_EVENT) {
	265	rc = opal_dump_read(dump->id, addr);
	266	if (rc == OPAL_BUSY_EVENT) {
	267	opal_poll_events(NULL);
	268	msleep(20);
	269	}
	270	}
	271
	272	if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL)
	273	pr_warn("%s: Extract dump failed for ID 0x%x\n",
	274	__func__, dump->id);
	275
	276	/* Free SG list */
3441f04b	277	opal_free_sg_list(list);
c7e64b9c SS	278
	279	out:
	280	return rc;
	281	}
	282
	283	static ssize_t dump_attr_read(struct file filep, struct kobject kobj,
	284	struct bin_attribute *bin_attr,
	285	char *buffer, loff_t pos, size_t count)
	286	{
	287	ssize_t rc;
	288
	289	struct dump_obj *dump = to_dump_obj(kobj);
	290
	291	if (!dump->buffer) {
	292	rc = dump_read_data(dump);
	293
	294	if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) {
	295	vfree(dump->buffer);
	296	dump->buffer = NULL;
	297
	298	return -EIO;
	299	}
	300	if (rc == OPAL_PARTIAL) {
	301	/* On a partial read, we just return EIO
	302	* and rely on userspace to ask us to try
	303	* again.
	304	*/
cdd91b89	305	pr_info("%s: Platform dump partially read. ID = 0x%x\n",
c7e64b9c SS	306	__func__, dump->id);
	307	return -EIO;
	308	}
	309	}
	310
	311	memcpy(buffer, dump->buffer + pos, count);
	312
	313	/* You may think we could free the dump buffer now and retrieve
	314	* it again later if needed, but due to current firmware limitation,
	315	* that's not the case. So, once read into userspace once,
	316	* we keep the dump around until it's acknowledged by userspace.
	317	*/
	318
	319	return count;
	320	}
	321
	322	static struct dump_obj *create_dump_obj(uint32_t id, size_t size,
	323	uint32_t type)
	324	{
	325	struct dump_obj *dump;
	326	int rc;
	327
	328	dump = kzalloc(sizeof(*dump), GFP_KERNEL);
	329	if (!dump)
	330	return NULL;
	331
	332	dump->kobj.kset = dump_kset;
	333
	334	kobject_init(&dump->kobj, &dump_ktype);
	335
	336	sysfs_bin_attr_init(&dump->dump_attr);
	337
	338	dump->dump_attr.attr.name = "dump";
	339	dump->dump_attr.attr.mode = 0400;
	340	dump->dump_attr.size = size;
	341	dump->dump_attr.read = dump_attr_read;
	342
	343	dump->id = id;
	344	dump->size = size;
	345	dump->type = type;
	346
	347	rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id);
	348	if (rc) {
	349	kobject_put(&dump->kobj);
	350	return NULL;
	351	}
	352
	353	rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr);
	354	if (rc) {
	355	kobject_put(&dump->kobj);
	356	return NULL;
	357	}
	358
	359	pr_info("%s: New platform dump. ID = 0x%x Size %u\n",
	360	__func__, dump->id, dump->size);
	361
	362	kobject_uevent(&dump->kobj, KOBJ_ADD);
	363
	364	return dump;
	365	}
	366
8034f715	367	static irqreturn_t process_dump(int irq, void *data)
c7e64b9c SS	368	{
	369	int rc;
	370	uint32_t dump_id, dump_size, dump_type;
	371	struct dump_obj *dump;
	372	char name[22];
a9cbf0b2	373	struct kobject *kobj;
c7e64b9c SS	374
	375	rc = dump_read_info(&dump_id, &dump_size, &dump_type);
	376	if (rc != OPAL_SUCCESS)
	377	return rc;
	378
	379	sprintf(name, "0x%x-0x%x", dump_type, dump_id);
	380
	381	/* we may get notified twice, let's handle
	382	* that gracefully and not create two conflicting
	383	* entries.
	384	*/
a9cbf0b2 MO	385	kobj = kset_find_obj(dump_kset, name);
	386	if (kobj) {
	387	/* Drop reference added by kset_find_obj() */
	388	kobject_put(kobj);
c7e64b9c	389	return 0;
a9cbf0b2	390	}
c7e64b9c SS	391
	392	dump = create_dump_obj(dump_id, dump_size, dump_type);
	393	if (!dump)
	394	return -1;
	395
8034f715	396	return IRQ_HANDLED;
c7e64b9c SS	397	}
c7e64b9c SS	398
c7e64b9c SS	399	void __init opal_platform_dump_init(void)
	400	{
	401	int rc;
8034f715	402	int dump_irq;
c7e64b9c	403
831cf65b MN	404	/* ELOG not supported by firmware */
	405	if (!opal_check_token(OPAL_DUMP_READ))
	406	return;
	407
c7e64b9c SS	408	dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
	409	if (!dump_kset) {
	410	pr_warn("%s: Failed to create dump kset\n", __func__);
	411	return;
	412	}
	413
	414	rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group);
	415	if (rc) {
	416	pr_warn("%s: Failed to create initiate dump attr group\n",
	417	__func__);
	418	kobject_put(&dump_kset->kobj);
	419	return;
	420	}
	421
8034f715 AP	422	dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL));
	423	if (!dump_irq) {
	424	pr_err("%s: Can't register OPAL event irq (%d)\n",
	425	__func__, dump_irq);
	426	return;
	427	}
	428
	429	rc = request_threaded_irq(dump_irq, NULL, process_dump,
	430	IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
	431	"opal-dump", NULL);
c7e64b9c	432	if (rc) {
8034f715 AP	433	pr_err("%s: Can't request OPAL event irq (%d)\n",
8034f715 AP	434	__func__, rc);
c7e64b9c SS	435	return;
	436	}
	437
7e73a3b7 SS	438	if (opal_check_token(OPAL_DUMP_RESEND))
7e73a3b7 SS	439	opal_dump_resend_notification();
c7e64b9c	440	}