[mirror_ubuntu-artful-kernel.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 <linux/slab.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 const 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 = ps3_system_bus_get_drvdata(&dev->sbd);
	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_all(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 = ps3_system_bus_get_drvdata(&dev->sbd);
	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_all(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 = blk_fetch_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_all(req, -EIO);
			continue;
		}
	}
}

static void ps3disk_request(struct request_queue *q)
{
	struct ps3_storage_device *dev = q->queuedata;
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);

	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 = ps3_system_bus_get_drvdata(&dev->sbd);
	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 = ps3_system_bus_get_drvdata(&dev->sbd);
	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;
	}

	ps3_system_bus_set_drvdata(_dev, 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_hw_sectors(queue, dev->bounce_size >> 9);
	blk_queue_segment_boundary(queue, -1UL);
	blk_queue_dma_alignment(queue, dev->blk_size-1);
	blk_queue_logical_block_size(queue, dev->blk_size);

	blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
			  ps3disk_prepare_flush);

	blk_queue_max_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);
	ps3_system_bus_set_drvdata(_dev, 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 = ps3_system_bus_get_drvdata(&dev->sbd);

	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);
	ps3_system_bus_set_drvdata(_dev, 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>
5a0e3ad6	23	#include <linux/slab.h>
c6131fa5 GU	24
	25	#include <asm/lv1call.h>
	26	#include <asm/ps3stor.h>
	27	#include <asm/firmware.h>
	28
	29
	30	#define DEVICE_NAME "ps3disk"
	31
	32	#define BOUNCE_SIZE (64*1024)
	33
	34	#define PS3DISK_MAX_DISKS 16
	35	#define PS3DISK_MINORS 16
	36
	37
	38	#define PS3DISK_NAME "ps3d%c"
	39
	40
	41	struct ps3disk_private {
	42	spinlock_t lock; /* Request queue spinlock */
	43	struct request_queue *queue;
	44	struct gendisk *gendisk;
	45	unsigned int blocking_factor;
	46	struct request *req;
	47	u64 raw_capacity;
	48	unsigned char model[ATA_ID_PROD_LEN+1];
	49	};
	50
	51
	52	#define LV1_STORAGE_SEND_ATA_COMMAND (2)
	53	#define LV1_STORAGE_ATA_HDDOUT (0x23)
	54
	55	struct lv1_ata_cmnd_block {
	56	u16 features;
	57	u16 sector_count;
	58	u16 LBA_low;
	59	u16 LBA_mid;
	60	u16 LBA_high;
	61	u8 device;
	62	u8 command;
	63	u32 is_ext;
	64	u32 proto;
	65	u32 in_out;
	66	u32 size;
	67	u64 buffer;
	68	u32 arglen;
	69	};
	70
	71	enum lv1_ata_proto {
	72	NON_DATA_PROTO = 0,
	73	PIO_DATA_IN_PROTO = 1,
	74	PIO_DATA_OUT_PROTO = 2,
	75	DMA_PROTO = 3
	76	};
	77
	78	enum lv1_ata_in_out {
	79	DIR_WRITE = 0, /* memory -> device */
	80	DIR_READ = 1 /* device -> memory */
	81	};
	82
	83	static int ps3disk_major;
	84
	85
83d5cde4	86	static const struct block_device_operations ps3disk_fops = {
c6131fa5 GU	87	.owner = THIS_MODULE,
	88	};
	89
	90
	91	static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
	92	struct request *req, int gather)
	93	{
	94	unsigned int offset = 0;
5705f702	95	struct req_iterator iter;
c6131fa5	96	struct bio_vec *bvec;
5705f702	97	unsigned int i = 0;
c6131fa5 GU	98	size_t size;
	99	void *buf;
	100
5705f702 N	101	rq_for_each_segment(bvec, req, iter) {
5705f702 N	102	unsigned long flags;
c6131fa5 GU	103	dev_dbg(&dev->sbd.core,
c6131fa5 GU	104	"%s:%u: bio %u: %u segs %u sectors from %lu\n",
5705f702	105	__func__, __LINE__, i, bio_segments(iter.bio),
31e103c5	106	bio_sectors(iter.bio), iter.bio->bi_sector);
5705f702	107
6c92e699 JA	108	size = bvec->bv_len;
	109	buf = bvec_kmap_irq(bvec, &flags);
	110	if (gather)
	111	memcpy(dev->bounce_buf+offset, buf, size);
	112	else
	113	memcpy(buf, dev->bounce_buf+offset, size);
	114	offset += size;
	115	flush_kernel_dcache_page(bvec->bv_page);
	116	bvec_kunmap_irq(bvec, &flags);
c6131fa5 GU	117	i++;
	118	}
	119	}
	120
	121	static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
	122	struct request *req)
	123	{
03fa68c2	124	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	125	int write = rq_data_dir(req), res;
	126	const char *op = write ? "write" : "read";
	127	u64 start_sector, sectors;
	128	unsigned int region_id = dev->regions[dev->region_idx].id;
	129
	130	#ifdef DEBUG
	131	unsigned int n = 0;
5705f702 N	132	struct bio_vec *bv;
5705f702 N	133	struct req_iterator iter;
c6131fa5	134
5705f702	135	rq_for_each_segment(bv, req, iter)
c6131fa5 GU	136	n++;
c6131fa5 GU	137	dev_dbg(&dev->sbd.core,
83096ebf TH	138	"%s:%u: %s req has %u bvecs for %u sectors\n",
83096ebf TH	139	__func__, __LINE__, op, n, blk_rq_sectors(req));
c6131fa5 GU	140	#endif
c6131fa5 GU	141
83096ebf TH	142	start_sector = blk_rq_pos(req) * priv->blocking_factor;
83096ebf TH	143	sectors = blk_rq_sectors(req) * priv->blocking_factor;
e377c6e2	144	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
c6131fa5 GU	145	__func__, __LINE__, op, sectors, start_sector);
	146
	147	if (write) {
	148	ps3disk_scatter_gather(dev, req, 1);
	149
	150	res = lv1_storage_write(dev->sbd.dev_id, region_id,
	151	start_sector, sectors, 0,
	152	dev->bounce_lpar, &dev->tag);
	153	} else {
	154	res = lv1_storage_read(dev->sbd.dev_id, region_id,
	155	start_sector, sectors, 0,
	156	dev->bounce_lpar, &dev->tag);
	157	}
	158	if (res) {
	159	dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
	160	__LINE__, op, res);
10e1e629	161	__blk_end_request_all(req, -EIO);
c6131fa5 GU	162	return 0;
	163	}
	164
	165	priv->req = req;
	166	return 1;
	167	}
	168
	169	static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
	170	struct request *req)
	171	{
03fa68c2	172	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	173	u64 res;
	174
	175	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
	176
	177	res = lv1_storage_send_device_command(dev->sbd.dev_id,
	178	LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
	179	0, &dev->tag);
	180	if (res) {
e377c6e2	181	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5	182	__func__, __LINE__, res);
10e1e629	183	__blk_end_request_all(req, -EIO);
c6131fa5 GU	184	return 0;
	185	}
	186
	187	priv->req = req;
	188	return 1;
	189	}
	190
	191	static void ps3disk_do_request(struct ps3_storage_device *dev,
165125e1	192	struct request_queue *q)
c6131fa5 GU	193	{
	194	struct request *req;
	195
	196	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	197
9934c8c0	198	while ((req = blk_fetch_request(q))) {
c6131fa5 GU	199	if (blk_fs_request(req)) {
	200	if (ps3disk_submit_request_sg(dev, req))
	201	break;
1a8e2bdd DW	202	} else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
1a8e2bdd DW	203	req->cmd[0] == REQ_LB_OP_FLUSH) {
c6131fa5 GU	204	if (ps3disk_submit_flush_request(dev, req))
	205	break;
	206	} else {
	207	blk_dump_rq_flags(req, DEVICE_NAME " bad request");
10e1e629	208	__blk_end_request_all(req, -EIO);
c6131fa5 GU	209	continue;
	210	}
	211	}
	212	}
	213
165125e1	214	static void ps3disk_request(struct request_queue *q)
c6131fa5 GU	215	{
c6131fa5 GU	216	struct ps3_storage_device *dev = q->queuedata;
03fa68c2	217	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	218
	219	if (priv->req) {
	220	dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
	221	return;
	222	}
	223
	224	ps3disk_do_request(dev, q);
	225	}
	226
	227	static irqreturn_t ps3disk_interrupt(int irq, void *data)
	228	{
	229	struct ps3_storage_device *dev = data;
	230	struct ps3disk_private *priv;
	231	struct request *req;
f01ab252	232	int res, read, error;
c6131fa5	233	u64 tag, status;
c6131fa5 GU	234	const char *op;
	235
	236	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
	237
	238	if (tag != dev->tag)
	239	dev_err(&dev->sbd.core,
e377c6e2	240	"%s:%u: tag mismatch, got %llx, expected %llx\n",
c6131fa5 GU	241	__func__, __LINE__, tag, dev->tag);
	242
	243	if (res) {
e377c6e2	244	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
c6131fa5 GU	245	__func__, __LINE__, res, status);
	246	return IRQ_HANDLED;
	247	}
	248
03fa68c2	249	priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	250	req = priv->req;
	251	if (!req) {
	252	dev_dbg(&dev->sbd.core,
	253	"%s:%u non-block layer request completed\n", __func__,
	254	__LINE__);
	255	dev->lv1_status = status;
	256	complete(&dev->done);
	257	return IRQ_HANDLED;
	258	}
	259
1a8e2bdd DW	260	if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
1a8e2bdd DW	261	req->cmd[0] == REQ_LB_OP_FLUSH) {
c6131fa5	262	read = 0;
c6131fa5 GU	263	op = "flush";
	264	} else {
	265	read = !rq_data_dir(req);
c6131fa5 GU	266	op = read ? "read" : "write";
	267	}
	268	if (status) {
e377c6e2	269	dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
c6131fa5	270	__LINE__, op, status);
f01ab252	271	error = -EIO;
c6131fa5 GU	272	} else {
	273	dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
	274	__LINE__, op);
f01ab252	275	error = 0;
c6131fa5 GU	276	if (read)
	277	ps3disk_scatter_gather(dev, req, 0);
	278	}
	279
	280	spin_lock(&priv->lock);
cd4c34eb	281	__blk_end_request_all(req, error);
c6131fa5 GU	282	priv->req = NULL;
	283	ps3disk_do_request(dev, priv->queue);
	284	spin_unlock(&priv->lock);
	285
	286	return IRQ_HANDLED;
	287	}
	288
	289	static int ps3disk_sync_cache(struct ps3_storage_device *dev)
	290	{
	291	u64 res;
	292
	293	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
	294
	295	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	296	if (res) {
e377c6e2	297	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5 GU	298	__func__, __LINE__, res);
	299	return -EIO;
	300	}
	301	return 0;
	302	}
	303
	304
	305	/* ATA helpers copied from drivers/ata/libata-core.c */
	306
	307	static void swap_buf_le16(u16 *buf, unsigned int buf_words)
	308	{
	309	#ifdef __BIG_ENDIAN
	310	unsigned int i;
	311
	312	for (i = 0; i < buf_words; i++)
	313	buf[i] = le16_to_cpu(buf[i]);
	314	#endif /* __BIG_ENDIAN */
	315	}
	316
	317	static u64 ata_id_n_sectors(const u16 *id)
	318	{
	319	if (ata_id_has_lba(id)) {
	320	if (ata_id_has_lba48(id))
	321	return ata_id_u64(id, 100);
	322	else
	323	return ata_id_u32(id, 60);
	324	} else {
	325	if (ata_id_current_chs_valid(id))
	326	return ata_id_u32(id, 57);
	327	else
	328	return id[1] * id[3] * id[6];
	329	}
	330	}
	331
	332	static void ata_id_string(const u16 id, unsigned char s, unsigned int ofs,
	333	unsigned int len)
	334	{
	335	unsigned int c;
	336
	337	while (len > 0) {
	338	c = id[ofs] >> 8;
	339	*s = c;
	340	s++;
	341
	342	c = id[ofs] & 0xff;
	343	*s = c;
	344	s++;
	345
	346	ofs++;
	347	len -= 2;
	348	}
	349	}
	350
	351	static void ata_id_c_string(const u16 id, unsigned char s, unsigned int ofs,
	352	unsigned int len)
	353	{
	354	unsigned char *p;
	355
	356	WARN_ON(!(len & 1));
	357
	358	ata_id_string(id, s, ofs, len - 1);
	359
	360	p = s + strnlen(s, len - 1);
	361	while (p > s && p[-1] == ' ')
362	p--;
363	*p = '\0';
364	}
365
366	static int ps3disk_identify(struct ps3_storage_device *dev)
367	{
03fa68c2	368	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	369	struct lv1_ata_cmnd_block ata_cmnd;
	370	u16 *id = dev->bounce_buf;
	371	u64 res;
	372
	373	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
	374
	375	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
	376	ata_cmnd.command = ATA_CMD_ID_ATA;
	377	ata_cmnd.sector_count = 1;
	378	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
	379	ata_cmnd.buffer = dev->bounce_lpar;
	380	ata_cmnd.proto = PIO_DATA_IN_PROTO;
	381	ata_cmnd.in_out = DIR_READ;
	382
	383	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
	384	ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
	385	sizeof(ata_cmnd), ata_cmnd.buffer,
	386	ata_cmnd.arglen);
	387	if (res) {
e377c6e2	388	dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
c6131fa5 GU	389	__func__, __LINE__, res);
	390	return -EIO;
	391	}
	392
	393	swap_buf_le16(id, ATA_ID_WORDS);
	394
	395	/* All we're interested in are raw capacity and model name */
	396	priv->raw_capacity = ata_id_n_sectors(id);
	397	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	398	return 0;
	399	}
	400
165125e1	401	static void ps3disk_prepare_flush(struct request_queue q, struct request req)
c6131fa5 GU	402	{
	403	struct ps3_storage_device *dev = q->queuedata;
	404
	405	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	406
1a8e2bdd DW	407	req->cmd_type = REQ_TYPE_LINUX_BLOCK;
1a8e2bdd DW	408	req->cmd[0] = REQ_LB_OP_FLUSH;
c6131fa5 GU	409	}
c6131fa5 GU	410
c6131fa5 GU	411	static unsigned long ps3disk_mask;
	412
	413	static DEFINE_MUTEX(ps3disk_mask_mutex);
	414
	415	static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
	416	{
	417	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	418	struct ps3disk_private *priv;
	419	int error;
	420	unsigned int devidx;
	421	struct request_queue *queue;
	422	struct gendisk *gendisk;
	423
	424	if (dev->blk_size < 512) {
	425	dev_err(&dev->sbd.core,
e377c6e2	426	"%s:%u: cannot handle block size %llu\n", __func__,
c6131fa5 GU	427	__LINE__, dev->blk_size);
	428	return -EINVAL;
	429	}
	430
	431	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	432	mutex_lock(&ps3disk_mask_mutex);
	433	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	434	if (devidx >= PS3DISK_MAX_DISKS) {
	435	dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
	436	__LINE__);
	437	mutex_unlock(&ps3disk_mask_mutex);
	438	return -ENOSPC;
	439	}
	440	__set_bit(devidx, &ps3disk_mask);
	441	mutex_unlock(&ps3disk_mask_mutex);
	442
	443	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	444	if (!priv) {
	445	error = -ENOMEM;
	446	goto fail;
	447	}
	448
03fa68c2	449	ps3_system_bus_set_drvdata(_dev, priv);
c6131fa5 GU	450	spin_lock_init(&priv->lock);
	451
	452	dev->bounce_size = BOUNCE_SIZE;
	453	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	454	if (!dev->bounce_buf) {
	455	error = -ENOMEM;
	456	goto fail_free_priv;
	457	}
	458
	459	error = ps3stor_setup(dev, ps3disk_interrupt);
	460	if (error)
	461	goto fail_free_bounce;
	462
	463	ps3disk_identify(dev);
	464
	465	queue = blk_init_queue(ps3disk_request, &priv->lock);
	466	if (!queue) {
	467	dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
	468	__func__, __LINE__);
	469	error = -ENOMEM;
	470	goto fail_teardown;
	471	}
	472
	473	priv->queue = queue;
	474	queue->queuedata = dev;
	475
	476	blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
	477
086fa5ff	478	blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
c6131fa5 GU	479	blk_queue_segment_boundary(queue, -1UL);
c6131fa5 GU	480	blk_queue_dma_alignment(queue, dev->blk_size-1);
e1defc4f	481	blk_queue_logical_block_size(queue, dev->blk_size);
c6131fa5	482
c6131fa5 GU	483	blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
	484	ps3disk_prepare_flush);
	485
8a78362c	486	blk_queue_max_segments(queue, -1);
c6131fa5 GU	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);
03fa68c2	526	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	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);
03fa68c2	537	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	538
c6131fa5 GU	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);
03fa68c2	551	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	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);