[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / zram / zram_sysfs.c

/*
 * Compressed RAM block device
 *
 * Copyright (C) 2008, 2009, 2010  Nitin Gupta
 *
 * This code is released using a dual license strategy: BSD/GPL
 * You can choose the licence that better fits your requirements.
 *
 * Released under the terms of 3-clause BSD License
 * Released under the terms of GNU General Public License Version 2.0
 *
 * Project home: http://compcache.googlecode.com/
 */

#include <linux/device.h>
#include <linux/genhd.h>
#include <linux/mm.h>

#include "zram_drv.h"

static u64 zram_stat64_read(struct zram *zram, u64 *v)
{
	u64 val;

	spin_lock(&zram->stat64_lock);
	val = *v;
	spin_unlock(&zram->stat64_lock);

	return val;
}

static struct zram *dev_to_zram(struct device *dev)
{
	int i;
	struct zram *zram = NULL;

	for (i = 0; i < zram_get_num_devices(); i++) {
		zram = &zram_devices[i];
		if (disk_to_dev(zram->disk) == dev)
			break;
	}

	return zram;
}

static ssize_t disksize_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n", zram->disksize);
}

static ssize_t disksize_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	int ret;
	u64 disksize;
	struct zram *zram = dev_to_zram(dev);

	ret = kstrtoull(buf, 10, &disksize);
	if (ret)
		return ret;

	down_write(&zram->init_lock);
	if (zram->init_done) {
		up_write(&zram->init_lock);
		pr_info("Cannot change disksize for initialized device\n");
		return -EBUSY;
	}

	zram->disksize = PAGE_ALIGN(disksize);
	set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
	up_write(&zram->init_lock);

	return len;
}

static ssize_t initstate_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%u\n", zram->init_done);
}

static ssize_t reset_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	int ret;
	unsigned short do_reset;
	struct zram *zram;
	struct block_device *bdev;

	zram = dev_to_zram(dev);
	bdev = bdget_disk(zram->disk, 0);

	/* Do not reset an active device! */
	if (bdev->bd_holders)
		return -EBUSY;

	ret = kstrtou16(buf, 10, &do_reset);
	if (ret)
		return ret;

	if (!do_reset)
		return -EINVAL;

	/* Make sure all pending I/O is finished */
	if (bdev)
		fsync_bdev(bdev);

	down_write(&zram->init_lock);
	if (zram->init_done)
		__zram_reset_device(zram);
	up_write(&zram->init_lock);

	return len;
}

static ssize_t num_reads_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n",
		zram_stat64_read(zram, &zram->stats.num_reads));
}

static ssize_t num_writes_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n",
		zram_stat64_read(zram, &zram->stats.num_writes));
}

static ssize_t invalid_io_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n",
		zram_stat64_read(zram, &zram->stats.invalid_io));
}

static ssize_t notify_free_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n",
		zram_stat64_read(zram, &zram->stats.notify_free));
}

static ssize_t zero_pages_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%u\n", zram->stats.pages_zero);
}

static ssize_t orig_data_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n",
		(u64)(zram->stats.pages_stored) << PAGE_SHIFT);
}

static ssize_t compr_data_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct zram *zram = dev_to_zram(dev);

	return sprintf(buf, "%llu\n",
		zram_stat64_read(zram, &zram->stats.compr_size));
}

static ssize_t mem_used_total_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	u64 val = 0;
	struct zram *zram = dev_to_zram(dev);

	if (zram->init_done)
		val = zs_get_total_size_bytes(zram->mem_pool);

	return sprintf(buf, "%llu\n", val);
}

static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR,
		disksize_show, disksize_store);
static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL);
static DEVICE_ATTR(reset, S_IWUSR, NULL, reset_store);
static DEVICE_ATTR(num_reads, S_IRUGO, num_reads_show, NULL);
static DEVICE_ATTR(num_writes, S_IRUGO, num_writes_show, NULL);
static DEVICE_ATTR(invalid_io, S_IRUGO, invalid_io_show, NULL);
static DEVICE_ATTR(notify_free, S_IRUGO, notify_free_show, NULL);
static DEVICE_ATTR(zero_pages, S_IRUGO, zero_pages_show, NULL);
static DEVICE_ATTR(orig_data_size, S_IRUGO, orig_data_size_show, NULL);
static DEVICE_ATTR(compr_data_size, S_IRUGO, compr_data_size_show, NULL);
static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL);

static struct attribute *zram_disk_attrs[] = {
	&dev_attr_disksize.attr,
	&dev_attr_initstate.attr,
	&dev_attr_reset.attr,
	&dev_attr_num_reads.attr,
	&dev_attr_num_writes.attr,
	&dev_attr_invalid_io.attr,
	&dev_attr_notify_free.attr,
	&dev_attr_zero_pages.attr,
	&dev_attr_orig_data_size.attr,
	&dev_attr_compr_data_size.attr,
	&dev_attr_mem_used_total.attr,
	NULL,
};

struct attribute_group zram_disk_attr_group = {
	.attrs = zram_disk_attrs,
};
Commit	Line	Data
33863c21 NG	1	/*
	2	* Compressed RAM block device
	3	*
	4	* Copyright (C) 2008, 2009, 2010 Nitin Gupta
	5	*
	6	* This code is released using a dual license strategy: BSD/GPL
	7	* You can choose the licence that better fits your requirements.
	8	*
	9	* Released under the terms of 3-clause BSD License
	10	* Released under the terms of GNU General Public License Version 2.0
	11	*
	12	* Project home: http://compcache.googlecode.com/
	13	*/
	14
	15	#include <linux/device.h>
	16	#include <linux/genhd.h>
f2da9873	17	#include <linux/mm.h>
33863c21 NG	18
	19	#include "zram_drv.h"
	20
33863c21 NG	21	static u64 zram_stat64_read(struct zram zram, u64 v)
	22	{
	23	u64 val;
	24
	25	spin_lock(&zram->stat64_lock);
	26	val = *v;
	27	spin_unlock(&zram->stat64_lock);
	28
	29	return val;
	30	}
	31
	32	static struct zram dev_to_zram(struct device dev)
	33	{
	34	int i;
	35	struct zram *zram = NULL;
	36
5fa5a901	37	for (i = 0; i < zram_get_num_devices(); i++) {
43801f6e	38	zram = &zram_devices[i];
33863c21 NG	39	if (disk_to_dev(zram->disk) == dev)
	40	break;
	41	}
	42
	43	return zram;
	44	}
	45
	46	static ssize_t disksize_show(struct device *dev,
	47	struct device_attribute attr, char buf)
	48	{
	49	struct zram *zram = dev_to_zram(dev);
	50
	51	return sprintf(buf, "%llu\n", zram->disksize);
	52	}
	53
	54	static ssize_t disksize_store(struct device *dev,
	55	struct device_attribute attr, const char buf, size_t len)
	56	{
	57	int ret;
0900beae	58	u64 disksize;
33863c21 NG	59	struct zram *zram = dev_to_zram(dev);
33863c21 NG	60
04e7bbad	61	ret = kstrtoull(buf, 10, &disksize);
0900beae JM	62	if (ret)
	63	return ret;
	64
	65	down_write(&zram->init_lock);
484875ad	66	if (zram->init_done) {
0900beae	67	up_write(&zram->init_lock);
484875ad	68	pr_info("Cannot change disksize for initialized device\n");
33863c21	69	return -EBUSY;
484875ad	70	}
33863c21	71
0900beae	72	zram->disksize = PAGE_ALIGN(disksize);
33863c21	73	set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
0900beae	74	up_write(&zram->init_lock);
33863c21 NG	75
	76	return len;
	77	}
	78
	79	static ssize_t initstate_show(struct device *dev,
	80	struct device_attribute attr, char buf)
	81	{
	82	struct zram *zram = dev_to_zram(dev);
	83
	84	return sprintf(buf, "%u\n", zram->init_done);
	85	}
	86
33863c21 NG	87	static ssize_t reset_store(struct device *dev,
	88	struct device_attribute attr, const char buf, size_t len)
	89	{
	90	int ret;
04e7bbad	91	unsigned short do_reset;
33863c21 NG	92	struct zram *zram;
	93	struct block_device *bdev;
	94
	95	zram = dev_to_zram(dev);
	96	bdev = bdget_disk(zram->disk, 0);
	97
	98	/* Do not reset an active device! */
	99	if (bdev->bd_holders)
	100	return -EBUSY;
	101
04e7bbad	102	ret = kstrtou16(buf, 10, &do_reset);
33863c21 NG	103	if (ret)
	104	return ret;
	105
	106	if (!do_reset)
	107	return -EINVAL;
	108
	109	/* Make sure all pending I/O is finished */
	110	if (bdev)
	111	fsync_bdev(bdev);
	112
0900beae	113	down_write(&zram->init_lock);
33863c21	114	if (zram->init_done)
0900beae JM	115	__zram_reset_device(zram);
0900beae JM	116	up_write(&zram->init_lock);
33863c21 NG	117
	118	return len;
	119	}
	120
	121	static ssize_t num_reads_show(struct device *dev,
	122	struct device_attribute attr, char buf)
	123	{
	124	struct zram *zram = dev_to_zram(dev);
	125
	126	return sprintf(buf, "%llu\n",
	127	zram_stat64_read(zram, &zram->stats.num_reads));
	128	}
	129
	130	static ssize_t num_writes_show(struct device *dev,
	131	struct device_attribute attr, char buf)
	132	{
	133	struct zram *zram = dev_to_zram(dev);
	134
	135	return sprintf(buf, "%llu\n",
	136	zram_stat64_read(zram, &zram->stats.num_writes));
	137	}
	138
	139	static ssize_t invalid_io_show(struct device *dev,
	140	struct device_attribute attr, char buf)
	141	{
	142	struct zram *zram = dev_to_zram(dev);
	143
	144	return sprintf(buf, "%llu\n",
	145	zram_stat64_read(zram, &zram->stats.invalid_io));
	146	}
	147
	148	static ssize_t notify_free_show(struct device *dev,
	149	struct device_attribute attr, char buf)
	150	{
	151	struct zram *zram = dev_to_zram(dev);
	152
	153	return sprintf(buf, "%llu\n",
	154	zram_stat64_read(zram, &zram->stats.notify_free));
	155	}
	156
	157	static ssize_t zero_pages_show(struct device *dev,
	158	struct device_attribute attr, char buf)
	159	{
	160	struct zram *zram = dev_to_zram(dev);
	161
	162	return sprintf(buf, "%u\n", zram->stats.pages_zero);
	163	}
	164
	165	static ssize_t orig_data_size_show(struct device *dev,
	166	struct device_attribute attr, char buf)
	167	{
	168	struct zram *zram = dev_to_zram(dev);
	169
	170	return sprintf(buf, "%llu\n",
	171	(u64)(zram->stats.pages_stored) << PAGE_SHIFT);
	172	}
	173
	174	static ssize_t compr_data_size_show(struct device *dev,
	175	struct device_attribute attr, char buf)
	176	{
	177	struct zram *zram = dev_to_zram(dev);
	178
	179	return sprintf(buf, "%llu\n",
	180	zram_stat64_read(zram, &zram->stats.compr_size));
181	}
182
183	static ssize_t mem_used_total_show(struct device *dev,
184	struct device_attribute attr, char buf)
185	{
186	u64 val = 0;
187	struct zram *zram = dev_to_zram(dev);
188
130f315a MK	189	if (zram->init_done)
130f315a MK	190	val = zs_get_total_size_bytes(zram->mem_pool);
33863c21 NG	191
	192	return sprintf(buf, "%llu\n", val);
	193	}
	194
a3d13107	195	static DEVICE_ATTR(disksize, S_IRUGO \| S_IWUSR,
33863c21	196	disksize_show, disksize_store);
484875ad	197	static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL);
a3d13107	198	static DEVICE_ATTR(reset, S_IWUSR, NULL, reset_store);
33863c21 NG	199	static DEVICE_ATTR(num_reads, S_IRUGO, num_reads_show, NULL);
	200	static DEVICE_ATTR(num_writes, S_IRUGO, num_writes_show, NULL);
	201	static DEVICE_ATTR(invalid_io, S_IRUGO, invalid_io_show, NULL);
	202	static DEVICE_ATTR(notify_free, S_IRUGO, notify_free_show, NULL);
	203	static DEVICE_ATTR(zero_pages, S_IRUGO, zero_pages_show, NULL);
	204	static DEVICE_ATTR(orig_data_size, S_IRUGO, orig_data_size_show, NULL);
	205	static DEVICE_ATTR(compr_data_size, S_IRUGO, compr_data_size_show, NULL);
	206	static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL);
	207
	208	static struct attribute *zram_disk_attrs[] = {
	209	&dev_attr_disksize.attr,
	210	&dev_attr_initstate.attr,
	211	&dev_attr_reset.attr,
	212	&dev_attr_num_reads.attr,
	213	&dev_attr_num_writes.attr,
	214	&dev_attr_invalid_io.attr,
	215	&dev_attr_notify_free.attr,
	216	&dev_attr_zero_pages.attr,
	217	&dev_attr_orig_data_size.attr,
	218	&dev_attr_compr_data_size.attr,
	219	&dev_attr_mem_used_total.attr,
	220	NULL,
	221	};
	222
	223	struct attribute_group zram_disk_attr_group = {
	224	.attrs = zram_disk_attrs,
	225	};