[linux-block.git] / drivers / block / ps3disk.c

/*
 * PS3 Disk Storage Driver
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2007 Sony 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; version 2 of the License.
 *
 * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/ata.h>
#include <linux/blkdev.h>

#include <asm/lv1call.h>
#include <asm/ps3stor.h>
#include <asm/firmware.h>


#define DEVICE_NAME		"ps3disk"

#define BOUNCE_SIZE		(64*1024)

#define PS3DISK_MAX_DISKS	16
#define PS3DISK_MINORS		16


#define PS3DISK_NAME		"ps3d%c"


struct ps3disk_private {
	spinlock_t lock;		/* Request queue spinlock */
	struct request_queue *queue;
	struct gendisk *gendisk;
	unsigned int blocking_factor;
	struct request *req;
	u64 raw_capacity;
	unsigned char model[ATA_ID_PROD_LEN+1];
};


#define LV1_STORAGE_SEND_ATA_COMMAND	(2)
#define LV1_STORAGE_ATA_HDDOUT		(0x23)

struct lv1_ata_cmnd_block {
	u16	features;
	u16	sector_count;
	u16	LBA_low;
	u16	LBA_mid;
	u16	LBA_high;
	u8	device;
	u8	command;
	u32	is_ext;
	u32	proto;
	u32	in_out;
	u32	size;
	u64	buffer;
	u32	arglen;
};

enum lv1_ata_proto {
	NON_DATA_PROTO     = 0,
	PIO_DATA_IN_PROTO  = 1,
	PIO_DATA_OUT_PROTO = 2,
	DMA_PROTO = 3
};

enum lv1_ata_in_out {
	DIR_WRITE = 0,			/* memory -> device */
	DIR_READ = 1			/* device -> memory */
};

static int ps3disk_major;


static struct block_device_operations ps3disk_fops = {
	.owner		= THIS_MODULE,
};


static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
				   struct request *req, int gather)
{
	unsigned int offset = 0;
	struct req_iterator iter;
	struct bio_vec *bvec;
	unsigned int i = 0;
	size_t size;
	void *buf;

	rq_for_each_segment(bvec, req, iter) {
		unsigned long flags;
		dev_dbg(&dev->sbd.core,
			"%s:%u: bio %u: %u segs %u sectors from %lu\n",
			__func__, __LINE__, i, bio_segments(iter.bio),
			bio_sectors(iter.bio), iter.bio->bi_sector);

		size = bvec->bv_len;
		buf = bvec_kmap_irq(bvec, &flags);
		if (gather)
			memcpy(dev->bounce_buf+offset, buf, size);
		else
			memcpy(buf, dev->bounce_buf+offset, size);
		offset += size;
		flush_kernel_dcache_page(bvec->bv_page);
		bvec_kunmap_irq(bvec, &flags);
		i++;
	}
}

static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
				     struct request *req)
{
	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	int write = rq_data_dir(req), res;
	const char *op = write ? "write" : "read";
	u64 start_sector, sectors;
	unsigned int region_id = dev->regions[dev->region_idx].id;

#ifdef DEBUG
	unsigned int n = 0;
	struct bio_vec *bv;
	struct req_iterator iter;

	rq_for_each_segment(bv, req, iter)
		n++;
	dev_dbg(&dev->sbd.core,
		"%s:%u: %s req has %u bvecs for %u sectors\n",
		__func__, __LINE__, op, n, blk_rq_sectors(req));
#endif

	start_sector = blk_rq_pos(req) * priv->blocking_factor;
	sectors = blk_rq_sectors(req) * priv->blocking_factor;
	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
		__func__, __LINE__, op, sectors, start_sector);

	if (write) {
		ps3disk_scatter_gather(dev, req, 1);

		res = lv1_storage_write(dev->sbd.dev_id, region_id,
					start_sector, sectors, 0,
					dev->bounce_lpar, &dev->tag);
	} else {
		res = lv1_storage_read(dev->sbd.dev_id, region_id,
				       start_sector, sectors, 0,
				       dev->bounce_lpar, &dev->tag);
	}
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
			__LINE__, op, res);
		__blk_end_request_cur(req, -EIO);
		return 0;
	}

	priv->req = req;
	return 1;
}

static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
					struct request *req)
{
	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	u64 res;

	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);

	res = lv1_storage_send_device_command(dev->sbd.dev_id,
					      LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
					      0, &dev->tag);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
			__func__, __LINE__, res);
		__blk_end_request_cur(req, -EIO);
		return 0;
	}

	priv->req = req;
	return 1;
}

static void ps3disk_do_request(struct ps3_storage_device *dev,
			       struct request_queue *q)
{
	struct request *req;

	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);

	while ((req = elv_next_request(q))) {
		if (blk_fs_request(req)) {
			if (ps3disk_submit_request_sg(dev, req))
				break;
		} else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
			   req->cmd[0] == REQ_LB_OP_FLUSH) {
			if (ps3disk_submit_flush_request(dev, req))
				break;
		} else {
			blk_dump_rq_flags(req, DEVICE_NAME " bad request");
			__blk_end_request_cur(req, -EIO);
			continue;
		}
	}
}

static void ps3disk_request(struct request_queue *q)
{
	struct ps3_storage_device *dev = q->queuedata;
	struct ps3disk_private *priv = dev->sbd.core.driver_data;

	if (priv->req) {
		dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
		return;
	}

	ps3disk_do_request(dev, q);
}

static irqreturn_t ps3disk_interrupt(int irq, void *data)
{
	struct ps3_storage_device *dev = data;
	struct ps3disk_private *priv;
	struct request *req;
	int res, read, error;
	u64 tag, status;
	const char *op;

	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);

	if (tag != dev->tag)
		dev_err(&dev->sbd.core,
			"%s:%u: tag mismatch, got %llx, expected %llx\n",
			__func__, __LINE__, tag, dev->tag);

	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
			__func__, __LINE__, res, status);
		return IRQ_HANDLED;
	}

	priv = dev->sbd.core.driver_data;
	req = priv->req;
	if (!req) {
		dev_dbg(&dev->sbd.core,
			"%s:%u non-block layer request completed\n", __func__,
			__LINE__);
		dev->lv1_status = status;
		complete(&dev->done);
		return IRQ_HANDLED;
	}

	if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
	    req->cmd[0] == REQ_LB_OP_FLUSH) {
		read = 0;
		op = "flush";
	} else {
		read = !rq_data_dir(req);
		op = read ? "read" : "write";
	}
	if (status) {
		dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
			__LINE__, op, status);
		error = -EIO;
	} else {
		dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
			__LINE__, op);
		error = 0;
		if (read)
			ps3disk_scatter_gather(dev, req, 0);
	}

	spin_lock(&priv->lock);
	__blk_end_request_all(req, error);
	priv->req = NULL;
	ps3disk_do_request(dev, priv->queue);
	spin_unlock(&priv->lock);

	return IRQ_HANDLED;
}

static int ps3disk_sync_cache(struct ps3_storage_device *dev)
{
	u64 res;

	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);

	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
			__func__, __LINE__, res);
		return -EIO;
	}
	return 0;
}


/* ATA helpers copied from drivers/ata/libata-core.c */

static void swap_buf_le16(u16 *buf, unsigned int buf_words)
{
#ifdef __BIG_ENDIAN
	unsigned int i;

	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
}

static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
			  unsigned int len)
{
	unsigned int c;

	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

		c = id[ofs] & 0xff;
		*s = c;
		s++;

		ofs++;
		len -= 2;
	}
}

static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
			    unsigned int len)
{
	unsigned char *p;

	WARN_ON(!(len & 1));

	ata_id_string(id, s, ofs, len - 1);

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}

static int ps3disk_identify(struct ps3_storage_device *dev)
{
	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	struct lv1_ata_cmnd_block ata_cmnd;
	u16 *id = dev->bounce_buf;
	u64 res;

	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);

	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
	ata_cmnd.command = ATA_CMD_ID_ATA;
	ata_cmnd.sector_count = 1;
	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
	ata_cmnd.buffer = dev->bounce_lpar;
	ata_cmnd.proto = PIO_DATA_IN_PROTO;
	ata_cmnd.in_out = DIR_READ;

	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
				   ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
				   sizeof(ata_cmnd), ata_cmnd.buffer,
				   ata_cmnd.arglen);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
			__func__, __LINE__, res);
		return -EIO;
	}

	swap_buf_le16(id, ATA_ID_WORDS);

	/* All we're interested in are raw capacity and model name */
	priv->raw_capacity = ata_id_n_sectors(id);
	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	return 0;
}

static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
{
	struct ps3_storage_device *dev = q->queuedata;

	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);

	req->cmd_type = REQ_TYPE_LINUX_BLOCK;
	req->cmd[0] = REQ_LB_OP_FLUSH;
}

static unsigned long ps3disk_mask;

static DEFINE_MUTEX(ps3disk_mask_mutex);

static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct ps3disk_private *priv;
	int error;
	unsigned int devidx;
	struct request_queue *queue;
	struct gendisk *gendisk;

	if (dev->blk_size < 512) {
		dev_err(&dev->sbd.core,
			"%s:%u: cannot handle block size %llu\n", __func__,
			__LINE__, dev->blk_size);
		return -EINVAL;
	}

	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	mutex_lock(&ps3disk_mask_mutex);
	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	if (devidx >= PS3DISK_MAX_DISKS) {
		dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
			__LINE__);
		mutex_unlock(&ps3disk_mask_mutex);
		return -ENOSPC;
	}
	__set_bit(devidx, &ps3disk_mask);
	mutex_unlock(&ps3disk_mask_mutex);

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		error = -ENOMEM;
		goto fail;
	}

	dev->sbd.core.driver_data = priv;
	spin_lock_init(&priv->lock);

	dev->bounce_size = BOUNCE_SIZE;
	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	if (!dev->bounce_buf) {
		error = -ENOMEM;
		goto fail_free_priv;
	}

	error = ps3stor_setup(dev, ps3disk_interrupt);
	if (error)
		goto fail_free_bounce;

	ps3disk_identify(dev);

	queue = blk_init_queue(ps3disk_request, &priv->lock);
	if (!queue) {
		dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
			__func__, __LINE__);
		error = -ENOMEM;
		goto fail_teardown;
	}

	priv->queue = queue;
	queue->queuedata = dev;

	blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);

	blk_queue_max_sectors(queue, dev->bounce_size >> 9);
	blk_queue_segment_boundary(queue, -1UL);
	blk_queue_dma_alignment(queue, dev->blk_size-1);
	blk_queue_hardsect_size(queue, dev->blk_size);

	blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
			  ps3disk_prepare_flush);

	blk_queue_max_phys_segments(queue, -1);
	blk_queue_max_hw_segments(queue, -1);
	blk_queue_max_segment_size(queue, dev->bounce_size);

	gendisk = alloc_disk(PS3DISK_MINORS);
	if (!gendisk) {
		dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
			__LINE__);
		error = -ENOMEM;
		goto fail_cleanup_queue;
	}

	priv->gendisk = gendisk;
	gendisk->major = ps3disk_major;
	gendisk->first_minor = devidx * PS3DISK_MINORS;
	gendisk->fops = &ps3disk_fops;
	gendisk->queue = queue;
	gendisk->private_data = dev;
	gendisk->driverfs_dev = &dev->sbd.core;
	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
		 devidx+'a');
	priv->blocking_factor = dev->blk_size >> 9;
	set_capacity(gendisk,
		     dev->regions[dev->region_idx].size*priv->blocking_factor);

	dev_info(&dev->sbd.core,
		 "%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
		 gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
		 get_capacity(gendisk) >> 11);

	add_disk(gendisk);
	return 0;

fail_cleanup_queue:
	blk_cleanup_queue(queue);
fail_teardown:
	ps3stor_teardown(dev);
fail_free_bounce:
	kfree(dev->bounce_buf);
fail_free_priv:
	kfree(priv);
	dev->sbd.core.driver_data = NULL;
fail:
	mutex_lock(&ps3disk_mask_mutex);
	__clear_bit(devidx, &ps3disk_mask);
	mutex_unlock(&ps3disk_mask_mutex);
	return error;
}

static int ps3disk_remove(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct ps3disk_private *priv = dev->sbd.core.driver_data;

	mutex_lock(&ps3disk_mask_mutex);
	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
		    &ps3disk_mask);
	mutex_unlock(&ps3disk_mask_mutex);
	del_gendisk(priv->gendisk);
	blk_cleanup_queue(priv->queue);
	put_disk(priv->gendisk);
	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
	ps3disk_sync_cache(dev);
	ps3stor_teardown(dev);
	kfree(dev->bounce_buf);
	kfree(priv);
	dev->sbd.core.driver_data = NULL;
	return 0;
}

static struct ps3_system_bus_driver ps3disk = {
	.match_id	= PS3_MATCH_ID_STOR_DISK,
	.core.name	= DEVICE_NAME,
	.core.owner	= THIS_MODULE,
	.probe		= ps3disk_probe,
	.remove		= ps3disk_remove,
	.shutdown	= ps3disk_remove,
};


static int __init ps3disk_init(void)
{
	int error;

	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
		return -ENODEV;

	error = register_blkdev(0, DEVICE_NAME);
	if (error <= 0) {
		printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
		       __LINE__, error);
		return error;
	}
	ps3disk_major = error;

	pr_info("%s:%u: registered block device major %d\n", __func__,
		__LINE__, ps3disk_major);

	error = ps3_system_bus_driver_register(&ps3disk);
	if (error)
		unregister_blkdev(ps3disk_major, DEVICE_NAME);

	return error;
}

static void __exit ps3disk_exit(void)
{
	ps3_system_bus_driver_unregister(&ps3disk);
	unregister_blkdev(ps3disk_major, DEVICE_NAME);
}

module_init(ps3disk_init);
module_exit(ps3disk_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 Disk Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);
Commit	Line	Data
c6131fa5 GU	1	/*
	2	* PS3 Disk Storage Driver
	3	*
	4	* Copyright (C) 2007 Sony Computer Entertainment Inc.
	5	* Copyright 2007 Sony Corp.
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published
	9	* by the Free Software Foundation; version 2 of the License.
	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 along
	17	* with this program; if not, write to the Free Software Foundation, Inc.,
	18	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	19	*/
	20
	21	#include <linux/ata.h>
	22	#include <linux/blkdev.h>
	23
	24	#include <asm/lv1call.h>
	25	#include <asm/ps3stor.h>
	26	#include <asm/firmware.h>
	27
	28
	29	#define DEVICE_NAME "ps3disk"
	30
	31	#define BOUNCE_SIZE (64*1024)
	32
	33	#define PS3DISK_MAX_DISKS 16
	34	#define PS3DISK_MINORS 16
	35
	36
	37	#define PS3DISK_NAME "ps3d%c"
	38
	39
	40	struct ps3disk_private {
	41	spinlock_t lock; /* Request queue spinlock */
	42	struct request_queue *queue;
	43	struct gendisk *gendisk;
	44	unsigned int blocking_factor;
	45	struct request *req;
	46	u64 raw_capacity;
	47	unsigned char model[ATA_ID_PROD_LEN+1];
	48	};
	49
	50
	51	#define LV1_STORAGE_SEND_ATA_COMMAND (2)
	52	#define LV1_STORAGE_ATA_HDDOUT (0x23)
	53
	54	struct lv1_ata_cmnd_block {
	55	u16 features;
	56	u16 sector_count;
	57	u16 LBA_low;
	58	u16 LBA_mid;
	59	u16 LBA_high;
	60	u8 device;
	61	u8 command;
	62	u32 is_ext;
	63	u32 proto;
	64	u32 in_out;
65	u32 size;
66	u64 buffer;
67	u32 arglen;
68	};
69
70	enum lv1_ata_proto {
71	NON_DATA_PROTO = 0,
72	PIO_DATA_IN_PROTO = 1,
73	PIO_DATA_OUT_PROTO = 2,
74	DMA_PROTO = 3
75	};
76
77	enum lv1_ata_in_out {
78	DIR_WRITE = 0, /* memory -> device */
79	DIR_READ = 1 /* device -> memory */
80	};
81
82	static int ps3disk_major;
83
84
85	static struct block_device_operations ps3disk_fops = {
86	.owner = THIS_MODULE,
87	};
88
89
90	static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
91	struct request *req, int gather)
92	{
93	unsigned int offset = 0;
5705f702	94	struct req_iterator iter;
c6131fa5	95	struct bio_vec *bvec;
5705f702	96	unsigned int i = 0;
c6131fa5 GU	97	size_t size;
	98	void *buf;
	99
5705f702 N	100	rq_for_each_segment(bvec, req, iter) {
5705f702 N	101	unsigned long flags;
c6131fa5 GU	102	dev_dbg(&dev->sbd.core,
c6131fa5 GU	103	"%s:%u: bio %u: %u segs %u sectors from %lu\n",
5705f702	104	__func__, __LINE__, i, bio_segments(iter.bio),
31e103c5	105	bio_sectors(iter.bio), iter.bio->bi_sector);
5705f702	106
6c92e699 JA	107	size = bvec->bv_len;
	108	buf = bvec_kmap_irq(bvec, &flags);
	109	if (gather)
	110	memcpy(dev->bounce_buf+offset, buf, size);
	111	else
	112	memcpy(buf, dev->bounce_buf+offset, size);
	113	offset += size;
	114	flush_kernel_dcache_page(bvec->bv_page);
	115	bvec_kunmap_irq(bvec, &flags);
c6131fa5 GU	116	i++;
	117	}
	118	}
	119
	120	static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
	121	struct request *req)
	122	{
	123	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	124	int write = rq_data_dir(req), res;
	125	const char *op = write ? "write" : "read";
	126	u64 start_sector, sectors;
	127	unsigned int region_id = dev->regions[dev->region_idx].id;
	128
	129	#ifdef DEBUG
	130	unsigned int n = 0;
5705f702 N	131	struct bio_vec *bv;
5705f702 N	132	struct req_iterator iter;
c6131fa5	133
5705f702	134	rq_for_each_segment(bv, req, iter)
c6131fa5 GU	135	n++;
c6131fa5 GU	136	dev_dbg(&dev->sbd.core,
83096ebf TH	137	"%s:%u: %s req has %u bvecs for %u sectors\n",
83096ebf TH	138	__func__, __LINE__, op, n, blk_rq_sectors(req));
c6131fa5 GU	139	#endif
c6131fa5 GU	140
83096ebf TH	141	start_sector = blk_rq_pos(req) * priv->blocking_factor;
83096ebf TH	142	sectors = blk_rq_sectors(req) * priv->blocking_factor;
e377c6e2	143	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
c6131fa5 GU	144	__func__, __LINE__, op, sectors, start_sector);
	145
	146	if (write) {
	147	ps3disk_scatter_gather(dev, req, 1);
	148
	149	res = lv1_storage_write(dev->sbd.dev_id, region_id,
	150	start_sector, sectors, 0,
	151	dev->bounce_lpar, &dev->tag);
	152	} else {
	153	res = lv1_storage_read(dev->sbd.dev_id, region_id,
	154	start_sector, sectors, 0,
	155	dev->bounce_lpar, &dev->tag);
	156	}
	157	if (res) {
	158	dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
	159	__LINE__, op, res);
f06d9a2b	160	__blk_end_request_cur(req, -EIO);
c6131fa5 GU	161	return 0;
	162	}
	163
	164	priv->req = req;
	165	return 1;
	166	}
	167
	168	static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
	169	struct request *req)
	170	{
	171	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	172	u64 res;
	173
	174	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
	175
	176	res = lv1_storage_send_device_command(dev->sbd.dev_id,
	177	LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
	178	0, &dev->tag);
	179	if (res) {
e377c6e2	180	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5	181	__func__, __LINE__, res);
f06d9a2b	182	__blk_end_request_cur(req, -EIO);
c6131fa5 GU	183	return 0;
	184	}
	185
	186	priv->req = req;
	187	return 1;
	188	}
	189
	190	static void ps3disk_do_request(struct ps3_storage_device *dev,
165125e1	191	struct request_queue *q)
c6131fa5 GU	192	{
	193	struct request *req;
	194
	195	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	196
	197	while ((req = elv_next_request(q))) {
	198	if (blk_fs_request(req)) {
	199	if (ps3disk_submit_request_sg(dev, req))
	200	break;
1a8e2bdd DW	201	} else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
1a8e2bdd DW	202	req->cmd[0] == REQ_LB_OP_FLUSH) {
c6131fa5 GU	203	if (ps3disk_submit_flush_request(dev, req))
	204	break;
	205	} else {
	206	blk_dump_rq_flags(req, DEVICE_NAME " bad request");
f06d9a2b	207	__blk_end_request_cur(req, -EIO);
c6131fa5 GU	208	continue;
	209	}
	210	}
	211	}
	212
165125e1	213	static void ps3disk_request(struct request_queue *q)
c6131fa5 GU	214	{
	215	struct ps3_storage_device *dev = q->queuedata;
	216	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	217
	218	if (priv->req) {
	219	dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
	220	return;
	221	}
	222
	223	ps3disk_do_request(dev, q);
	224	}
	225
	226	static irqreturn_t ps3disk_interrupt(int irq, void *data)
	227	{
	228	struct ps3_storage_device *dev = data;
	229	struct ps3disk_private *priv;
	230	struct request *req;
f01ab252	231	int res, read, error;
c6131fa5	232	u64 tag, status;
c6131fa5 GU	233	const char *op;
	234
	235	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
	236
	237	if (tag != dev->tag)
	238	dev_err(&dev->sbd.core,
e377c6e2	239	"%s:%u: tag mismatch, got %llx, expected %llx\n",
c6131fa5 GU	240	__func__, __LINE__, tag, dev->tag);
	241
	242	if (res) {
e377c6e2	243	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
c6131fa5 GU	244	__func__, __LINE__, res, status);
	245	return IRQ_HANDLED;
	246	}
	247
	248	priv = dev->sbd.core.driver_data;
	249	req = priv->req;
	250	if (!req) {
	251	dev_dbg(&dev->sbd.core,
	252	"%s:%u non-block layer request completed\n", __func__,
	253	__LINE__);
	254	dev->lv1_status = status;
	255	complete(&dev->done);
	256	return IRQ_HANDLED;
	257	}
	258
1a8e2bdd DW	259	if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
1a8e2bdd DW	260	req->cmd[0] == REQ_LB_OP_FLUSH) {
c6131fa5	261	read = 0;
c6131fa5 GU	262	op = "flush";
	263	} else {
	264	read = !rq_data_dir(req);
c6131fa5 GU	265	op = read ? "read" : "write";
	266	}
	267	if (status) {
e377c6e2	268	dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
c6131fa5	269	__LINE__, op, status);
f01ab252	270	error = -EIO;
c6131fa5 GU	271	} else {
	272	dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
	273	__LINE__, op);
f01ab252	274	error = 0;
c6131fa5 GU	275	if (read)
	276	ps3disk_scatter_gather(dev, req, 0);
	277	}
	278
	279	spin_lock(&priv->lock);
cd4c34eb	280	__blk_end_request_all(req, error);
c6131fa5 GU	281	priv->req = NULL;
	282	ps3disk_do_request(dev, priv->queue);
	283	spin_unlock(&priv->lock);
	284
	285	return IRQ_HANDLED;
	286	}
	287
	288	static int ps3disk_sync_cache(struct ps3_storage_device *dev)
	289	{
	290	u64 res;
	291
	292	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
	293
	294	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	295	if (res) {
e377c6e2	296	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5 GU	297	__func__, __LINE__, res);
	298	return -EIO;
	299	}
	300	return 0;
	301	}
	302
	303
	304	/* ATA helpers copied from drivers/ata/libata-core.c */
	305
	306	static void swap_buf_le16(u16 *buf, unsigned int buf_words)
	307	{
	308	#ifdef __BIG_ENDIAN
	309	unsigned int i;
	310
	311	for (i = 0; i < buf_words; i++)
	312	buf[i] = le16_to_cpu(buf[i]);
	313	#endif /* __BIG_ENDIAN */
	314	}
	315
	316	static u64 ata_id_n_sectors(const u16 *id)
	317	{
	318	if (ata_id_has_lba(id)) {
	319	if (ata_id_has_lba48(id))
	320	return ata_id_u64(id, 100);
	321	else
	322	return ata_id_u32(id, 60);
	323	} else {
	324	if (ata_id_current_chs_valid(id))
	325	return ata_id_u32(id, 57);
	326	else
	327	return id[1] * id[3] * id[6];
	328	}
	329	}
	330
	331	static void ata_id_string(const u16 id, unsigned char s, unsigned int ofs,
	332	unsigned int len)
	333	{
	334	unsigned int c;
	335
	336	while (len > 0) {
	337	c = id[ofs] >> 8;
	338	*s = c;
	339	s++;
	340
	341	c = id[ofs] & 0xff;
	342	*s = c;
	343	s++;
	344
	345	ofs++;
	346	len -= 2;
	347	}
	348	}
	349
	350	static void ata_id_c_string(const u16 id, unsigned char s, unsigned int ofs,
	351	unsigned int len)
	352	{
	353	unsigned char *p;
	354
	355	WARN_ON(!(len & 1));
	356
	357	ata_id_string(id, s, ofs, len - 1);
	358
	359	p = s + strnlen(s, len - 1);
	360	while (p > s && p[-1] == ' ')
361	p--;
362	*p = '\0';
363	}
364
365	static int ps3disk_identify(struct ps3_storage_device *dev)
366	{
367	struct ps3disk_private *priv = dev->sbd.core.driver_data;
368	struct lv1_ata_cmnd_block ata_cmnd;
369	u16 *id = dev->bounce_buf;
370	u64 res;
371
372	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
373
374	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
375	ata_cmnd.command = ATA_CMD_ID_ATA;
376	ata_cmnd.sector_count = 1;
377	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
378	ata_cmnd.buffer = dev->bounce_lpar;
379	ata_cmnd.proto = PIO_DATA_IN_PROTO;
380	ata_cmnd.in_out = DIR_READ;
381
382	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
383	ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
384	sizeof(ata_cmnd), ata_cmnd.buffer,
385	ata_cmnd.arglen);
386	if (res) {
e377c6e2	387	dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
c6131fa5 GU	388	__func__, __LINE__, res);
	389	return -EIO;
	390	}
	391
	392	swap_buf_le16(id, ATA_ID_WORDS);
	393
	394	/* All we're interested in are raw capacity and model name */
	395	priv->raw_capacity = ata_id_n_sectors(id);
	396	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	397	return 0;
	398	}
	399
165125e1	400	static void ps3disk_prepare_flush(struct request_queue q, struct request req)
c6131fa5 GU	401	{
	402	struct ps3_storage_device *dev = q->queuedata;
	403
	404	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	405
1a8e2bdd DW	406	req->cmd_type = REQ_TYPE_LINUX_BLOCK;
1a8e2bdd DW	407	req->cmd[0] = REQ_LB_OP_FLUSH;
c6131fa5 GU	408	}
c6131fa5 GU	409
c6131fa5 GU	410	static unsigned long ps3disk_mask;
	411
	412	static DEFINE_MUTEX(ps3disk_mask_mutex);
	413
	414	static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
	415	{
	416	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	417	struct ps3disk_private *priv;
	418	int error;
	419	unsigned int devidx;
	420	struct request_queue *queue;
	421	struct gendisk *gendisk;
	422
	423	if (dev->blk_size < 512) {
	424	dev_err(&dev->sbd.core,
e377c6e2	425	"%s:%u: cannot handle block size %llu\n", __func__,
c6131fa5 GU	426	__LINE__, dev->blk_size);
	427	return -EINVAL;
	428	}
	429
	430	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	431	mutex_lock(&ps3disk_mask_mutex);
	432	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	433	if (devidx >= PS3DISK_MAX_DISKS) {
	434	dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
	435	__LINE__);
	436	mutex_unlock(&ps3disk_mask_mutex);
	437	return -ENOSPC;
	438	}
	439	__set_bit(devidx, &ps3disk_mask);
	440	mutex_unlock(&ps3disk_mask_mutex);
	441
	442	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	443	if (!priv) {
	444	error = -ENOMEM;
	445	goto fail;
	446	}
	447
	448	dev->sbd.core.driver_data = priv;
	449	spin_lock_init(&priv->lock);
	450
	451	dev->bounce_size = BOUNCE_SIZE;
	452	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	453	if (!dev->bounce_buf) {
	454	error = -ENOMEM;
	455	goto fail_free_priv;
	456	}
	457
	458	error = ps3stor_setup(dev, ps3disk_interrupt);
	459	if (error)
	460	goto fail_free_bounce;
	461
	462	ps3disk_identify(dev);
	463
	464	queue = blk_init_queue(ps3disk_request, &priv->lock);
	465	if (!queue) {
	466	dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
	467	__func__, __LINE__);
	468	error = -ENOMEM;
	469	goto fail_teardown;
	470	}
	471
	472	priv->queue = queue;
	473	queue->queuedata = dev;
	474
	475	blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
	476
	477	blk_queue_max_sectors(queue, dev->bounce_size >> 9);
	478	blk_queue_segment_boundary(queue, -1UL);
	479	blk_queue_dma_alignment(queue, dev->blk_size-1);
	480	blk_queue_hardsect_size(queue, dev->blk_size);
	481
c6131fa5 GU	482	blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
	483	ps3disk_prepare_flush);
	484
	485	blk_queue_max_phys_segments(queue, -1);
	486	blk_queue_max_hw_segments(queue, -1);
	487	blk_queue_max_segment_size(queue, dev->bounce_size);
	488
	489	gendisk = alloc_disk(PS3DISK_MINORS);
	490	if (!gendisk) {
	491	dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
	492	__LINE__);
	493	error = -ENOMEM;
	494	goto fail_cleanup_queue;
	495	}
	496
	497	priv->gendisk = gendisk;
	498	gendisk->major = ps3disk_major;
	499	gendisk->first_minor = devidx * PS3DISK_MINORS;
	500	gendisk->fops = &ps3disk_fops;
	501	gendisk->queue = queue;
	502	gendisk->private_data = dev;
	503	gendisk->driverfs_dev = &dev->sbd.core;
	504	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
	505	devidx+'a');
	506	priv->blocking_factor = dev->blk_size >> 9;
	507	set_capacity(gendisk,
	508	dev->regions[dev->region_idx].size*priv->blocking_factor);
	509
	510	dev_info(&dev->sbd.core,
e377c6e2	511	"%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
c6131fa5 GU	512	gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
	513	get_capacity(gendisk) >> 11);
	514
	515	add_disk(gendisk);
	516	return 0;
	517
	518	fail_cleanup_queue:
	519	blk_cleanup_queue(queue);
	520	fail_teardown:
	521	ps3stor_teardown(dev);
	522	fail_free_bounce:
	523	kfree(dev->bounce_buf);
	524	fail_free_priv:
	525	kfree(priv);
	526	dev->sbd.core.driver_data = NULL;
	527	fail:
	528	mutex_lock(&ps3disk_mask_mutex);
	529	__clear_bit(devidx, &ps3disk_mask);
	530	mutex_unlock(&ps3disk_mask_mutex);
	531	return error;
	532	}
	533
	534	static int ps3disk_remove(struct ps3_system_bus_device *_dev)
	535	{
	536	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	537	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	538
	539	mutex_lock(&ps3disk_mask_mutex);
f331c029	540	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
c6131fa5 GU	541	&ps3disk_mask);
	542	mutex_unlock(&ps3disk_mask_mutex);
	543	del_gendisk(priv->gendisk);
	544	blk_cleanup_queue(priv->queue);
	545	put_disk(priv->gendisk);
	546	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
	547	ps3disk_sync_cache(dev);
	548	ps3stor_teardown(dev);
	549	kfree(dev->bounce_buf);
	550	kfree(priv);
	551	dev->sbd.core.driver_data = NULL;
	552	return 0;
	553	}
	554
	555	static struct ps3_system_bus_driver ps3disk = {
	556	.match_id = PS3_MATCH_ID_STOR_DISK,
	557	.core.name = DEVICE_NAME,
	558	.core.owner = THIS_MODULE,
	559	.probe = ps3disk_probe,
	560	.remove = ps3disk_remove,
	561	.shutdown = ps3disk_remove,
	562	};
	563
	564
	565	static int __init ps3disk_init(void)
	566	{
	567	int error;
	568
	569	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
	570	return -ENODEV;
	571
	572	error = register_blkdev(0, DEVICE_NAME);
	573	if (error <= 0) {
	574	printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
	575	__LINE__, error);
	576	return error;
	577	}
	578	ps3disk_major = error;
	579
	580	pr_info("%s:%u: registered block device major %d\n", __func__,
	581	__LINE__, ps3disk_major);
	582
	583	error = ps3_system_bus_driver_register(&ps3disk);
	584	if (error)
	585	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	586
	587	return error;
	588	}
	589
	590	static void __exit ps3disk_exit(void)
	591	{
	592	ps3_system_bus_driver_unregister(&ps3disk);
	593	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	594	}
	595
	596	module_init(ps3disk_init);
	597	module_exit(ps3disk_exit);
	598
	599	MODULE_LICENSE("GPL");
	600	MODULE_DESCRIPTION("PS3 Disk Storage Driver");
	601	MODULE_AUTHOR("Sony Corporation");
	602	MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);