[deliverable/linux.git] / fs / pstore / ram.c

/*
 * RAM Oops/Panic logger
 *
 * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
 * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/pstore.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pstore_ram.h>

#define RAMOOPS_KERNMSG_HDR "===="
#define MIN_MEM_SIZE 4096UL

static ulong record_size = MIN_MEM_SIZE;
module_param(record_size, ulong, 0400);
MODULE_PARM_DESC(record_size,
		"size of each dump done on oops/panic");

static ulong mem_address;
module_param(mem_address, ulong, 0400);
MODULE_PARM_DESC(mem_address,
		"start of reserved RAM used to store oops/panic logs");

static ulong mem_size;
module_param(mem_size, ulong, 0400);
MODULE_PARM_DESC(mem_size,
		"size of reserved RAM used to store oops/panic logs");

static int dump_oops = 1;
module_param(dump_oops, int, 0600);
MODULE_PARM_DESC(dump_oops,
		"set to 1 to dump oopses, 0 to only dump panics (default 1)");

static int ramoops_ecc;
module_param_named(ecc, ramoops_ecc, int, 0600);
MODULE_PARM_DESC(ramoops_ecc,
		"set to 1 to enable ECC support");

struct ramoops_context {
	struct persistent_ram_zone **przs;
	phys_addr_t phys_addr;
	unsigned long size;
	size_t record_size;
	int dump_oops;
	bool ecc;
	unsigned int max_dump_cnt;
	unsigned int dump_write_cnt;
	unsigned int dump_read_cnt;
	struct pstore_info pstore;
};

static struct platform_device *dummy;
static struct ramoops_platform_data *dummy_data;

static int ramoops_pstore_open(struct pstore_info *psi)
{
	struct ramoops_context *cxt = psi->data;

	cxt->dump_read_cnt = 0;
	return 0;
}

static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
				   struct timespec *time,
				   char **buf,
				   struct pstore_info *psi)
{
	ssize_t size;
	struct ramoops_context *cxt = psi->data;
	struct persistent_ram_zone *prz;

	if (cxt->dump_read_cnt >= cxt->max_dump_cnt)
		return -EINVAL;

	*id = cxt->dump_read_cnt++;
	prz = cxt->przs[*id];

	/* Only supports dmesg output so far. */
	*type = PSTORE_TYPE_DMESG;
	/* TODO(kees): Bogus time for the moment. */
	time->tv_sec = 0;
	time->tv_nsec = 0;

	/* Update old/shadowed buffer. */
	persistent_ram_save_old(prz);
	size = persistent_ram_old_size(prz);
	*buf = kmalloc(size, GFP_KERNEL);
	if (*buf == NULL)
		return -ENOMEM;
	memcpy(*buf, persistent_ram_old(prz), size);

	return size;
}

static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
{
	char *hdr;
	struct timeval timestamp;
	size_t len;

	do_gettimeofday(&timestamp);
	hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
		(long)timestamp.tv_sec, (long)timestamp.tv_usec);
	WARN_ON_ONCE(!hdr);
	len = hdr ? strlen(hdr) : 0;
	persistent_ram_write(prz, hdr, len);
	kfree(hdr);

	return len;
}

static int ramoops_pstore_write(enum pstore_type_id type,
				enum kmsg_dump_reason reason,
				u64 *id,
				unsigned int part,
				size_t size, struct pstore_info *psi)
{
	struct ramoops_context *cxt = psi->data;
	struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt];
	size_t hlen;

	/* Currently ramoops is designed to only store dmesg dumps. */
	if (type != PSTORE_TYPE_DMESG)
		return -EINVAL;

	/* Out of the various dmesg dump types, ramoops is currently designed
	 * to only store crash logs, rather than storing general kernel logs.
	 */
	if (reason != KMSG_DUMP_OOPS &&
	    reason != KMSG_DUMP_PANIC)
		return -EINVAL;

	/* Skip Oopes when configured to do so. */
	if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
		return -EINVAL;

	/* Explicitly only take the first part of any new crash.
	 * If our buffer is larger than kmsg_bytes, this can never happen,
	 * and if our buffer is smaller than kmsg_bytes, we don't want the
	 * report split across multiple records.
	 */
	if (part != 1)
		return -ENOSPC;

	hlen = ramoops_write_kmsg_hdr(prz);
	if (size + hlen > prz->buffer_size)
		size = prz->buffer_size - hlen;
	persistent_ram_write(prz, cxt->pstore.buf, size);

	cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;

	return 0;
}

static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
				struct pstore_info *psi)
{
	struct ramoops_context *cxt = psi->data;

	if (id >= cxt->max_dump_cnt)
		return -EINVAL;

	persistent_ram_free_old(cxt->przs[id]);
	persistent_ram_zap(cxt->przs[id]);

	return 0;
}

static struct ramoops_context oops_cxt = {
	.pstore = {
		.owner	= THIS_MODULE,
		.name	= "ramoops",
		.open	= ramoops_pstore_open,
		.read	= ramoops_pstore_read,
		.write	= ramoops_pstore_write,
		.erase	= ramoops_pstore_erase,
	},
};

static int __init ramoops_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ramoops_platform_data *pdata = pdev->dev.platform_data;
	struct ramoops_context *cxt = &oops_cxt;
	int err = -EINVAL;
	int i;

	/* Only a single ramoops area allowed at a time, so fail extra
	 * probes.
	 */
	if (cxt->max_dump_cnt)
		goto fail_out;

	if (!pdata->mem_size || !pdata->record_size) {
		pr_err("The memory size and the record size must be "
			"non-zero\n");
		goto fail_out;
	}

	pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
	pdata->record_size = rounddown_pow_of_two(pdata->record_size);

	/* Check for the minimum memory size */
	if (pdata->mem_size < MIN_MEM_SIZE &&
			pdata->record_size < MIN_MEM_SIZE) {
		pr_err("memory size too small, minimum is %lu\n",
			MIN_MEM_SIZE);
		goto fail_out;
	}

	if (pdata->mem_size < pdata->record_size) {
		pr_err("The memory size must be larger than the "
			"records size\n");
		goto fail_out;
	}

	cxt->max_dump_cnt = pdata->mem_size / pdata->record_size;
	cxt->dump_read_cnt = 0;
	cxt->size = pdata->mem_size;
	cxt->phys_addr = pdata->mem_address;
	cxt->record_size = pdata->record_size;
	cxt->dump_oops = pdata->dump_oops;
	cxt->ecc = pdata->ecc;

	cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, GFP_KERNEL);
	if (!cxt->przs) {
		err = -ENOMEM;
		dev_err(dev, "failed to initialize a prz array\n");
		goto fail_out;
	}

	for (i = 0; i < cxt->max_dump_cnt; i++) {
		size_t sz = cxt->record_size;
		phys_addr_t start = cxt->phys_addr + sz * i;

		cxt->przs[i] = persistent_ram_new(start, sz, cxt->ecc);
		if (IS_ERR(cxt->przs[i])) {
			err = PTR_ERR(cxt->przs[i]);
			dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
				sz, (unsigned long long)start, err);
			goto fail_przs;
		}
	}

	cxt->pstore.data = cxt;
	cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
	cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
	spin_lock_init(&cxt->pstore.buf_lock);
	if (!cxt->pstore.buf) {
		pr_err("cannot allocate pstore buffer\n");
		goto fail_clear;
	}

	err = pstore_register(&cxt->pstore);
	if (err) {
		pr_err("registering with pstore failed\n");
		goto fail_buf;
	}

	/*
	 * Update the module parameter variables as well so they are visible
	 * through /sys/module/ramoops/parameters/
	 */
	mem_size = pdata->mem_size;
	mem_address = pdata->mem_address;
	record_size = pdata->record_size;
	dump_oops = pdata->dump_oops;

	pr_info("attached 0x%lx@0x%llx (%ux0x%zx), ecc: %s\n",
		cxt->size, (unsigned long long)cxt->phys_addr,
		cxt->max_dump_cnt, cxt->record_size,
		ramoops_ecc ? "on" : "off");

	return 0;

fail_buf:
	kfree(cxt->pstore.buf);
fail_clear:
	cxt->pstore.bufsize = 0;
	cxt->max_dump_cnt = 0;
fail_przs:
	for (i = 0; cxt->przs[i]; i++)
		persistent_ram_free(cxt->przs[i]);
	kfree(cxt->przs);
fail_out:
	return err;
}

static int __exit ramoops_remove(struct platform_device *pdev)
{
#if 0
	/* TODO(kees): We cannot unload ramoops since pstore doesn't support
	 * unregistering yet.
	 */
	struct ramoops_context *cxt = &oops_cxt;

	iounmap(cxt->virt_addr);
	release_mem_region(cxt->phys_addr, cxt->size);
	cxt->max_dump_cnt = 0;

	/* TODO(kees): When pstore supports unregistering, call it here. */
	kfree(cxt->pstore.buf);
	cxt->pstore.bufsize = 0;

	return 0;
#endif
	return -EBUSY;
}

static struct platform_driver ramoops_driver = {
	.remove		= __exit_p(ramoops_remove),
	.driver		= {
		.name	= "ramoops",
		.owner	= THIS_MODULE,
	},
};

static int __init ramoops_init(void)
{
	int ret;
	ret = platform_driver_probe(&ramoops_driver, ramoops_probe);
	if (ret == -ENODEV) {
		/*
		 * If we didn't find a platform device, we use module parameters
		 * building platform data on the fly.
		 */
		pr_info("platform device not found, using module parameters\n");
		dummy_data = kzalloc(sizeof(struct ramoops_platform_data),
				     GFP_KERNEL);
		if (!dummy_data)
			return -ENOMEM;
		dummy_data->mem_size = mem_size;
		dummy_data->mem_address = mem_address;
		dummy_data->record_size = record_size;
		dummy_data->dump_oops = dump_oops;
		dummy_data->ecc = ramoops_ecc;
		dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
			NULL, 0, dummy_data,
			sizeof(struct ramoops_platform_data));

		if (IS_ERR(dummy))
			ret = PTR_ERR(dummy);
		else
			ret = 0;
	}

	return ret;
}

static void __exit ramoops_exit(void)
{
	platform_driver_unregister(&ramoops_driver);
	kfree(dummy_data);
}

module_init(ramoops_init);
module_exit(ramoops_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
Commit	Line	Data
56d611a0 MS	1	/*
	2	* RAM Oops/Panic logger
	3	*
	4	* Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
9ba80d99	5	* Copyright (C) 2011 Kees Cook <keescook@chromium.org>
56d611a0 MS	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*
	21	*/
	22
0169256e MS	23	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0169256e MS	24
56d611a0	25	#include <linux/kernel.h>
83c1b317	26	#include <linux/err.h>
56d611a0	27	#include <linux/module.h>
9ba80d99	28	#include <linux/pstore.h>
56d611a0 MS	29	#include <linux/time.h>
	30	#include <linux/io.h>
	31	#include <linux/ioport.h>
c3b92ce9	32	#include <linux/platform_device.h>
13aefd72	33	#include <linux/slab.h>
1894a253	34	#include <linux/pstore_ram.h>
56d611a0 MS	35
56d611a0 MS	36	#define RAMOOPS_KERNMSG_HDR "===="
3e5c4fad	37	#define MIN_MEM_SIZE 4096UL
56d611a0	38
3e5c4fad SI	39	static ulong record_size = MIN_MEM_SIZE;
	40	module_param(record_size, ulong, 0400);
	41	MODULE_PARM_DESC(record_size,
	42	"size of each dump done on oops/panic");
56d611a0 MS	43
	44	static ulong mem_address;
	45	module_param(mem_address, ulong, 0400);
	46	MODULE_PARM_DESC(mem_address,
	47	"start of reserved RAM used to store oops/panic logs");
	48
	49	static ulong mem_size;
	50	module_param(mem_size, ulong, 0400);
	51	MODULE_PARM_DESC(mem_size,
	52	"size of reserved RAM used to store oops/panic logs");
	53
	54	static int dump_oops = 1;
	55	module_param(dump_oops, int, 0600);
	56	MODULE_PARM_DESC(dump_oops,
	57	"set to 1 to dump oopses, 0 to only dump panics (default 1)");
	58
39eb7e97 AV	59	static int ramoops_ecc;
	60	module_param_named(ecc, ramoops_ecc, int, 0600);
	61	MODULE_PARM_DESC(ramoops_ecc,
	62	"set to 1 to enable ECC support");
	63
9ba80d99	64	struct ramoops_context {
896fc1f0	65	struct persistent_ram_zone **przs;
56d611a0 MS	66	phys_addr_t phys_addr;
56d611a0 MS	67	unsigned long size;
9ba80d99	68	size_t record_size;
6b4d2a27	69	int dump_oops;
39eb7e97	70	bool ecc;
cac2eb7b AV	71	unsigned int max_dump_cnt;
	72	unsigned int dump_write_cnt;
	73	unsigned int dump_read_cnt;
9ba80d99 KC	74	struct pstore_info pstore;
9ba80d99 KC	75	};
56d611a0	76
13aefd72 MS	77	static struct platform_device *dummy;
	78	static struct ramoops_platform_data *dummy_data;
	79
9ba80d99 KC	80	static int ramoops_pstore_open(struct pstore_info *psi)
	81	{
	82	struct ramoops_context *cxt = psi->data;
	83
cac2eb7b	84	cxt->dump_read_cnt = 0;
9ba80d99 KC	85	return 0;
	86	}
	87
	88	static ssize_t ramoops_pstore_read(u64 id, enum pstore_type_id type,
	89	struct timespec *time,
	90	char **buf,
	91	struct pstore_info *psi)
56d611a0	92	{
9ba80d99	93	ssize_t size;
9ba80d99	94	struct ramoops_context *cxt = psi->data;
896fc1f0	95	struct persistent_ram_zone *prz;
9ba80d99	96
cac2eb7b	97	if (cxt->dump_read_cnt >= cxt->max_dump_cnt)
9ba80d99	98	return -EINVAL;
896fc1f0	99
cac2eb7b	100	*id = cxt->dump_read_cnt++;
896fc1f0 AV	101	prz = cxt->przs[*id];
896fc1f0 AV	102
9ba80d99 KC	103	/* Only supports dmesg output so far. */
	104	*type = PSTORE_TYPE_DMESG;
	105	/* TODO(kees): Bogus time for the moment. */
	106	time->tv_sec = 0;
	107	time->tv_nsec = 0;
	108
201e4aca AV	109	/* Update old/shadowed buffer. */
201e4aca AV	110	persistent_ram_save_old(prz);
896fc1f0	111	size = persistent_ram_old_size(prz);
9ba80d99 KC	112	*buf = kmalloc(size, GFP_KERNEL);
	113	if (*buf == NULL)
	114	return -ENOMEM;
896fc1f0	115	memcpy(*buf, persistent_ram_old(prz), size);
9ba80d99 KC	116
	117	return size;
	118	}
	119
896fc1f0 AV	120	static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
	121	{
	122	char *hdr;
	123	struct timeval timestamp;
	124	size_t len;
	125
	126	do_gettimeofday(&timestamp);
	127	hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
	128	(long)timestamp.tv_sec, (long)timestamp.tv_usec);
	129	WARN_ON_ONCE(!hdr);
	130	len = hdr ? strlen(hdr) : 0;
	131	persistent_ram_write(prz, hdr, len);
	132	kfree(hdr);
	133
	134	return len;
	135	}
	136
9ba80d99 KC	137	static int ramoops_pstore_write(enum pstore_type_id type,
	138	enum kmsg_dump_reason reason,
	139	u64 *id,
	140	unsigned int part,
	141	size_t size, struct pstore_info *psi)
	142	{
9ba80d99	143	struct ramoops_context *cxt = psi->data;
cac2eb7b	144	struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt];
896fc1f0	145	size_t hlen;
9ba80d99 KC	146
	147	/* Currently ramoops is designed to only store dmesg dumps. */
	148	if (type != PSTORE_TYPE_DMESG)
	149	return -EINVAL;
56d611a0	150
9ba80d99 KC	151	/* Out of the various dmesg dump types, ramoops is currently designed
	152	* to only store crash logs, rather than storing general kernel logs.
	153	*/
fc2d557c	154	if (reason != KMSG_DUMP_OOPS &&
a3dd3323	155	reason != KMSG_DUMP_PANIC)
9ba80d99	156	return -EINVAL;
fc2d557c	157
9ba80d99	158	/* Skip Oopes when configured to do so. */
6b4d2a27	159	if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
9ba80d99 KC	160	return -EINVAL;
	161
	162	/* Explicitly only take the first part of any new crash.
	163	* If our buffer is larger than kmsg_bytes, this can never happen,
	164	* and if our buffer is smaller than kmsg_bytes, we don't want the
	165	* report split across multiple records.
	166	*/
	167	if (part != 1)
	168	return -ENOSPC;
56d611a0	169
896fc1f0 AV	170	hlen = ramoops_write_kmsg_hdr(prz);
	171	if (size + hlen > prz->buffer_size)
	172	size = prz->buffer_size - hlen;
	173	persistent_ram_write(prz, cxt->pstore.buf, size);
56d611a0	174
cac2eb7b	175	cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
9ba80d99 KC	176
	177	return 0;
	178	}
	179
	180	static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
	181	struct pstore_info *psi)
	182	{
9ba80d99 KC	183	struct ramoops_context *cxt = psi->data;
9ba80d99 KC	184
cac2eb7b	185	if (id >= cxt->max_dump_cnt)
9ba80d99 KC	186	return -EINVAL;
9ba80d99 KC	187
896fc1f0	188	persistent_ram_free_old(cxt->przs[id]);
93cce049	189	persistent_ram_zap(cxt->przs[id]);
9ba80d99 KC	190
9ba80d99 KC	191	return 0;
56d611a0 MS	192	}
56d611a0 MS	193
9ba80d99 KC	194	static struct ramoops_context oops_cxt = {
	195	.pstore = {
	196	.owner = THIS_MODULE,
	197	.name = "ramoops",
	198	.open = ramoops_pstore_open,
	199	.read = ramoops_pstore_read,
	200	.write = ramoops_pstore_write,
	201	.erase = ramoops_pstore_erase,
	202	},
	203	};
	204
c3b92ce9	205	static int __init ramoops_probe(struct platform_device *pdev)
56d611a0	206	{
896fc1f0	207	struct device *dev = &pdev->dev;
c3b92ce9	208	struct ramoops_platform_data *pdata = pdev->dev.platform_data;
56d611a0 MS	209	struct ramoops_context *cxt = &oops_cxt;
56d611a0 MS	210	int err = -EINVAL;
896fc1f0	211	int i;
56d611a0	212
9ba80d99 KC	213	/* Only a single ramoops area allowed at a time, so fail extra
	214	* probes.
	215	*/
cac2eb7b	216	if (cxt->max_dump_cnt)
9ba80d99 KC	217	goto fail_out;
9ba80d99 KC	218
3e5c4fad SI	219	if (!pdata->mem_size \|\| !pdata->record_size) {
	220	pr_err("The memory size and the record size must be "
	221	"non-zero\n");
9ba80d99	222	goto fail_out;
56d611a0 MS	223	}
56d611a0 MS	224
fdb59507 MS	225	pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
fdb59507 MS	226	pdata->record_size = rounddown_pow_of_two(pdata->record_size);
56d611a0	227
3e5c4fad SI	228	/* Check for the minimum memory size */
	229	if (pdata->mem_size < MIN_MEM_SIZE &&
	230	pdata->record_size < MIN_MEM_SIZE) {
9ba80d99 KC	231	pr_err("memory size too small, minimum is %lu\n",
	232	MIN_MEM_SIZE);
	233	goto fail_out;
56d611a0 MS	234	}
56d611a0 MS	235
3e5c4fad SI	236	if (pdata->mem_size < pdata->record_size) {
	237	pr_err("The memory size must be larger than the "
	238	"records size\n");
9ba80d99	239	goto fail_out;
3e5c4fad SI	240	}
3e5c4fad SI	241
cac2eb7b AV	242	cxt->max_dump_cnt = pdata->mem_size / pdata->record_size;
cac2eb7b AV	243	cxt->dump_read_cnt = 0;
13aefd72 MS	244	cxt->size = pdata->mem_size;
13aefd72 MS	245	cxt->phys_addr = pdata->mem_address;
3e5c4fad	246	cxt->record_size = pdata->record_size;
6b4d2a27	247	cxt->dump_oops = pdata->dump_oops;
39eb7e97	248	cxt->ecc = pdata->ecc;
56d611a0	249
cac2eb7b	250	cxt->przs = kzalloc(sizeof(cxt->przs) cxt->max_dump_cnt, GFP_KERNEL);
896fc1f0 AV	251	if (!cxt->przs) {
	252	err = -ENOMEM;
	253	dev_err(dev, "failed to initialize a prz array\n");
	254	goto fail_out;
	255	}
	256
cac2eb7b	257	for (i = 0; i < cxt->max_dump_cnt; i++) {
896fc1f0 AV	258	size_t sz = cxt->record_size;
	259	phys_addr_t start = cxt->phys_addr + sz * i;
	260
39eb7e97	261	cxt->przs[i] = persistent_ram_new(start, sz, cxt->ecc);
896fc1f0 AV	262	if (IS_ERR(cxt->przs[i])) {
	263	err = PTR_ERR(cxt->przs[i]);
	264	dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
	265	sz, (unsigned long long)start, err);
	266	goto fail_przs;
	267	}
	268	}
	269
9ba80d99	270	cxt->pstore.data = cxt;
896fc1f0	271	cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
9ba80d99 KC	272	cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
	273	spin_lock_init(&cxt->pstore.buf_lock);
	274	if (!cxt->pstore.buf) {
	275	pr_err("cannot allocate pstore buffer\n");
	276	goto fail_clear;
	277	}
	278
9ba80d99	279	err = pstore_register(&cxt->pstore);
56d611a0	280	if (err) {
9ba80d99	281	pr_err("registering with pstore failed\n");
896fc1f0	282	goto fail_buf;
56d611a0 MS	283	}
56d611a0 MS	284
c755201e KC	285	/*
	286	* Update the module parameter variables as well so they are visible
	287	* through /sys/module/ramoops/parameters/
	288	*/
	289	mem_size = pdata->mem_size;
	290	mem_address = pdata->mem_address;
	291	record_size = pdata->record_size;
	292	dump_oops = pdata->dump_oops;
	293
39eb7e97	294	pr_info("attached 0x%lx@0x%llx (%ux0x%zx), ecc: %s\n",
d109a674	295	cxt->size, (unsigned long long)cxt->phys_addr,
cac2eb7b	296	cxt->max_dump_cnt, cxt->record_size,
39eb7e97	297	ramoops_ecc ? "on" : "off");
9ba80d99	298
56d611a0 MS	299	return 0;
56d611a0 MS	300
9ba80d99 KC	301	fail_buf:
	302	kfree(cxt->pstore.buf);
	303	fail_clear:
	304	cxt->pstore.bufsize = 0;
cac2eb7b	305	cxt->max_dump_cnt = 0;
896fc1f0 AV	306	fail_przs:
	307	for (i = 0; cxt->przs[i]; i++)
	308	persistent_ram_free(cxt->przs[i]);
	309	kfree(cxt->przs);
9ba80d99	310	fail_out:
56d611a0 MS	311	return err;
	312	}
	313
c3b92ce9	314	static int __exit ramoops_remove(struct platform_device *pdev)
56d611a0	315	{
9ba80d99 KC	316	#if 0
	317	/* TODO(kees): We cannot unload ramoops since pstore doesn't support
	318	* unregistering yet.
	319	*/
56d611a0 MS	320	struct ramoops_context *cxt = &oops_cxt;
56d611a0 MS	321
56d611a0 MS	322	iounmap(cxt->virt_addr);
56d611a0 MS	323	release_mem_region(cxt->phys_addr, cxt->size);
cac2eb7b	324	cxt->max_dump_cnt = 0;
9ba80d99 KC	325
	326	/* TODO(kees): When pstore supports unregistering, call it here. */
	327	kfree(cxt->pstore.buf);
	328	cxt->pstore.bufsize = 0;
	329
c3b92ce9	330	return 0;
9ba80d99 KC	331	#endif
9ba80d99 KC	332	return -EBUSY;
56d611a0 MS	333	}
56d611a0 MS	334
c3b92ce9 KP	335	static struct platform_driver ramoops_driver = {
	336	.remove = __exit_p(ramoops_remove),
	337	.driver = {
	338	.name = "ramoops",
	339	.owner = THIS_MODULE,
	340	},
	341	};
	342
	343	static int __init ramoops_init(void)
	344	{
13aefd72 MS	345	int ret;
	346	ret = platform_driver_probe(&ramoops_driver, ramoops_probe);
	347	if (ret == -ENODEV) {
	348	/*
	349	* If we didn't find a platform device, we use module parameters
	350	* building platform data on the fly.
	351	*/
0169256e	352	pr_info("platform device not found, using module parameters\n");
13aefd72 MS	353	dummy_data = kzalloc(sizeof(struct ramoops_platform_data),
	354	GFP_KERNEL);
	355	if (!dummy_data)
	356	return -ENOMEM;
	357	dummy_data->mem_size = mem_size;
	358	dummy_data->mem_address = mem_address;
3e5c4fad	359	dummy_data->record_size = record_size;
6b4d2a27	360	dummy_data->dump_oops = dump_oops;
39eb7e97	361	dummy_data->ecc = ramoops_ecc;
13aefd72 MS	362	dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
	363	NULL, 0, dummy_data,
	364	sizeof(struct ramoops_platform_data));
	365
	366	if (IS_ERR(dummy))
	367	ret = PTR_ERR(dummy);
	368	else
	369	ret = 0;
	370	}
	371
	372	return ret;
c3b92ce9 KP	373	}
	374
	375	static void __exit ramoops_exit(void)
	376	{
	377	platform_driver_unregister(&ramoops_driver);
13aefd72	378	kfree(dummy_data);
c3b92ce9	379	}
56d611a0 MS	380
	381	module_init(ramoops_init);
	382	module_exit(ramoops_exit);
	383
	384	MODULE_LICENSE("GPL");
	385	MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
	386	MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");