[linux-2.6-block.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 void ramoops_free_przs(struct ramoops_context *cxt)
{
	int i;

	if (!cxt->przs)
		return;

	for (i = 0; cxt->przs[i]; i++)
		persistent_ram_free(cxt->przs[i]);
	kfree(cxt->przs);
}

static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
			      phys_addr_t *paddr, size_t dump_mem_sz)
{
	int err = -ENOMEM;
	int i;

	if (!cxt->record_size)
		return 0;

	cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
	if (!cxt->max_dump_cnt)
		return -ENOMEM;

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

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

		cxt->przs[i] = persistent_ram_new(*paddr, 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)*paddr, err);
			goto fail_prz;
		}
		*paddr += sz;
	}

	return 0;
fail_prz:
	ramoops_free_przs(cxt);
	return err;
}

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;
	size_t dump_mem_sz;
	phys_addr_t paddr;
	int err = -EINVAL;

	/* 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);

	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;

	paddr = cxt->phys_addr;

	dump_mem_sz = cxt->size;
	err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
	if (err) {
		pr_err("memory size too small, minimum is %lu\n",
			cxt->record_size);
		goto fail_count;
	}

	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_count:
	ramoops_free_przs(cxt);
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
f4c5d242 AV	205	static void ramoops_free_przs(struct ramoops_context *cxt)
	206	{
	207	int i;
	208
	209	if (!cxt->przs)
	210	return;
	211
	212	for (i = 0; cxt->przs[i]; i++)
	213	persistent_ram_free(cxt->przs[i]);
	214	kfree(cxt->przs);
	215	}
	216
	217	static int ramoops_init_przs(struct device dev, struct ramoops_context cxt,
	218	phys_addr_t *paddr, size_t dump_mem_sz)
	219	{
	220	int err = -ENOMEM;
	221	int i;
	222
	223	if (!cxt->record_size)
	224	return 0;
	225
	226	cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
	227	if (!cxt->max_dump_cnt)
	228	return -ENOMEM;
	229
	230	cxt->przs = kzalloc(sizeof(cxt->przs) cxt->max_dump_cnt,
	231	GFP_KERNEL);
	232	if (!cxt->przs) {
	233	dev_err(dev, "failed to initialize a prz array for dumps\n");
	234	return -ENOMEM;
	235	}
	236
	237	for (i = 0; i < cxt->max_dump_cnt; i++) {
	238	size_t sz = cxt->record_size;
	239
	240	cxt->przs[i] = persistent_ram_new(*paddr, sz, cxt->ecc);
	241	if (IS_ERR(cxt->przs[i])) {
	242	err = PTR_ERR(cxt->przs[i]);
	243	dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
	244	sz, (unsigned long long)*paddr, err);
	245	goto fail_prz;
	246	}
	247	*paddr += sz;
	248	}
	249
	250	return 0;
	251	fail_prz:
	252	ramoops_free_przs(cxt);
	253	return err;
	254	}
	255
c3b92ce9	256	static int __init ramoops_probe(struct platform_device *pdev)
56d611a0	257	{
896fc1f0	258	struct device *dev = &pdev->dev;
c3b92ce9	259	struct ramoops_platform_data *pdata = pdev->dev.platform_data;
56d611a0	260	struct ramoops_context *cxt = &oops_cxt;
f4c5d242 AV	261	size_t dump_mem_sz;
f4c5d242 AV	262	phys_addr_t paddr;
56d611a0 MS	263	int err = -EINVAL;
56d611a0 MS	264
9ba80d99 KC	265	/* Only a single ramoops area allowed at a time, so fail extra
	266	* probes.
	267	*/
cac2eb7b	268	if (cxt->max_dump_cnt)
9ba80d99 KC	269	goto fail_out;
9ba80d99 KC	270
3e5c4fad SI	271	if (!pdata->mem_size \|\| !pdata->record_size) {
	272	pr_err("The memory size and the record size must be "
	273	"non-zero\n");
9ba80d99	274	goto fail_out;
56d611a0 MS	275	}
56d611a0 MS	276
fdb59507 MS	277	pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
fdb59507 MS	278	pdata->record_size = rounddown_pow_of_two(pdata->record_size);
56d611a0	279
cac2eb7b	280	cxt->dump_read_cnt = 0;
13aefd72 MS	281	cxt->size = pdata->mem_size;
13aefd72 MS	282	cxt->phys_addr = pdata->mem_address;
3e5c4fad	283	cxt->record_size = pdata->record_size;
6b4d2a27	284	cxt->dump_oops = pdata->dump_oops;
39eb7e97	285	cxt->ecc = pdata->ecc;
56d611a0	286
f4c5d242	287	paddr = cxt->phys_addr;
896fc1f0	288
f4c5d242 AV	289	dump_mem_sz = cxt->size;
	290	err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
	291	if (err) {
	292	pr_err("memory size too small, minimum is %lu\n",
	293	cxt->record_size);
	294	goto fail_count;
896fc1f0 AV	295	}
896fc1f0 AV	296
9ba80d99	297	cxt->pstore.data = cxt;
896fc1f0	298	cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
9ba80d99 KC	299	cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
	300	spin_lock_init(&cxt->pstore.buf_lock);
	301	if (!cxt->pstore.buf) {
	302	pr_err("cannot allocate pstore buffer\n");
	303	goto fail_clear;
	304	}
	305
9ba80d99	306	err = pstore_register(&cxt->pstore);
56d611a0	307	if (err) {
9ba80d99	308	pr_err("registering with pstore failed\n");
896fc1f0	309	goto fail_buf;
56d611a0 MS	310	}
56d611a0 MS	311
c755201e KC	312	/*
	313	* Update the module parameter variables as well so they are visible
	314	* through /sys/module/ramoops/parameters/
	315	*/
	316	mem_size = pdata->mem_size;
	317	mem_address = pdata->mem_address;
	318	record_size = pdata->record_size;
	319	dump_oops = pdata->dump_oops;
	320
39eb7e97	321	pr_info("attached 0x%lx@0x%llx (%ux0x%zx), ecc: %s\n",
d109a674	322	cxt->size, (unsigned long long)cxt->phys_addr,
cac2eb7b	323	cxt->max_dump_cnt, cxt->record_size,
39eb7e97	324	ramoops_ecc ? "on" : "off");
9ba80d99	325
56d611a0 MS	326	return 0;
56d611a0 MS	327
9ba80d99 KC	328	fail_buf:
	329	kfree(cxt->pstore.buf);
	330	fail_clear:
	331	cxt->pstore.bufsize = 0;
cac2eb7b	332	cxt->max_dump_cnt = 0;
f4c5d242 AV	333	fail_count:
f4c5d242 AV	334	ramoops_free_przs(cxt);
9ba80d99	335	fail_out:
56d611a0 MS	336	return err;
	337	}
	338
c3b92ce9	339	static int __exit ramoops_remove(struct platform_device *pdev)
56d611a0	340	{
9ba80d99 KC	341	#if 0
	342	/* TODO(kees): We cannot unload ramoops since pstore doesn't support
	343	* unregistering yet.
	344	*/
56d611a0 MS	345	struct ramoops_context *cxt = &oops_cxt;
56d611a0 MS	346
56d611a0 MS	347	iounmap(cxt->virt_addr);
56d611a0 MS	348	release_mem_region(cxt->phys_addr, cxt->size);
cac2eb7b	349	cxt->max_dump_cnt = 0;
9ba80d99 KC	350
	351	/* TODO(kees): When pstore supports unregistering, call it here. */
	352	kfree(cxt->pstore.buf);
	353	cxt->pstore.bufsize = 0;
	354
c3b92ce9	355	return 0;
9ba80d99 KC	356	#endif
9ba80d99 KC	357	return -EBUSY;
56d611a0 MS	358	}
56d611a0 MS	359
c3b92ce9 KP	360	static struct platform_driver ramoops_driver = {
	361	.remove = __exit_p(ramoops_remove),
	362	.driver = {
	363	.name = "ramoops",
	364	.owner = THIS_MODULE,
	365	},
	366	};
	367
	368	static int __init ramoops_init(void)
	369	{
13aefd72 MS	370	int ret;
	371	ret = platform_driver_probe(&ramoops_driver, ramoops_probe);
	372	if (ret == -ENODEV) {
	373	/*
	374	* If we didn't find a platform device, we use module parameters
	375	* building platform data on the fly.
	376	*/
0169256e	377	pr_info("platform device not found, using module parameters\n");
13aefd72 MS	378	dummy_data = kzalloc(sizeof(struct ramoops_platform_data),
	379	GFP_KERNEL);
	380	if (!dummy_data)
	381	return -ENOMEM;
	382	dummy_data->mem_size = mem_size;
	383	dummy_data->mem_address = mem_address;
3e5c4fad	384	dummy_data->record_size = record_size;
6b4d2a27	385	dummy_data->dump_oops = dump_oops;
39eb7e97	386	dummy_data->ecc = ramoops_ecc;
13aefd72 MS	387	dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
	388	NULL, 0, dummy_data,
	389	sizeof(struct ramoops_platform_data));
	390
	391	if (IS_ERR(dummy))
	392	ret = PTR_ERR(dummy);
	393	else
	394	ret = 0;
	395	}
	396
	397	return ret;
c3b92ce9 KP	398	}
	399
	400	static void __exit ramoops_exit(void)
	401	{
	402	platform_driver_unregister(&ramoops_driver);
13aefd72	403	kfree(dummy_data);
c3b92ce9	404	}
56d611a0 MS	405
	406	module_init(ramoops_init);
	407	module_exit(ramoops_exit);
	408
	409	MODULE_LICENSE("GPL");
	410	MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
	411	MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");