[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 <linux/module.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 sectors from %lu\n",
			__func__, __LINE__, i, bio_sectors(iter.bio),
			iter.bio->bi_iter.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(buf, &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))) {
		switch (req_op(req)) {
		case REQ_OP_FLUSH:
			if (ps3disk_submit_flush_request(dev, req))
				return;
			break;
		case REQ_OP_READ:
		case REQ_OP_WRITE:
			if (ps3disk_submit_request_sg(dev, req))
				return;
			break;
		default:
			blk_dump_rq_flags(req, DEVICE_NAME " bad request");
			__blk_end_request_all(req, -EIO);
		}
	}
}

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_op(req) == REQ_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 unsigned long ps3disk_mask;

static DEFINE_MUTEX(ps3disk_mask_mutex);

static int 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_write_cache(queue, true, false);

	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;
	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);

	device_add_disk(&dev->sbd.core, 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>
0c8d44f2	24	#include <linux/module.h>
c6131fa5 GU	25
	26	#include <asm/lv1call.h>
	27	#include <asm/ps3stor.h>
	28	#include <asm/firmware.h>
	29
	30
	31	#define DEVICE_NAME "ps3disk"
	32
	33	#define BOUNCE_SIZE (64*1024)
	34
	35	#define PS3DISK_MAX_DISKS 16
	36	#define PS3DISK_MINORS 16
	37
	38
	39	#define PS3DISK_NAME "ps3d%c"
	40
	41
	42	struct ps3disk_private {
	43	spinlock_t lock; /* Request queue spinlock */
	44	struct request_queue *queue;
	45	struct gendisk *gendisk;
	46	unsigned int blocking_factor;
	47	struct request *req;
	48	u64 raw_capacity;
	49	unsigned char model[ATA_ID_PROD_LEN+1];
	50	};
	51
	52
	53	#define LV1_STORAGE_SEND_ATA_COMMAND (2)
	54	#define LV1_STORAGE_ATA_HDDOUT (0x23)
	55
	56	struct lv1_ata_cmnd_block {
	57	u16 features;
	58	u16 sector_count;
	59	u16 LBA_low;
	60	u16 LBA_mid;
	61	u16 LBA_high;
	62	u8 device;
	63	u8 command;
	64	u32 is_ext;
	65	u32 proto;
	66	u32 in_out;
	67	u32 size;
	68	u64 buffer;
	69	u32 arglen;
	70	};
	71
	72	enum lv1_ata_proto {
	73	NON_DATA_PROTO = 0,
	74	PIO_DATA_IN_PROTO = 1,
	75	PIO_DATA_OUT_PROTO = 2,
	76	DMA_PROTO = 3
	77	};
	78
	79	enum lv1_ata_in_out {
	80	DIR_WRITE = 0, /* memory -> device */
	81	DIR_READ = 1 /* device -> memory */
	82	};
	83
	84	static int ps3disk_major;
	85
	86
83d5cde4	87	static const struct block_device_operations ps3disk_fops = {
c6131fa5 GU	88	.owner = THIS_MODULE,
	89	};
	90
	91
	92	static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
	93	struct request *req, int gather)
	94	{
	95	unsigned int offset = 0;
5705f702	96	struct req_iterator iter;
7988613b	97	struct bio_vec bvec;
5705f702	98	unsigned int i = 0;
c6131fa5 GU	99	size_t size;
	100	void *buf;
	101
5705f702 N	102	rq_for_each_segment(bvec, req, iter) {
5705f702 N	103	unsigned long flags;
458b76ed KO	104	dev_dbg(&dev->sbd.core, "%s:%u: bio %u: %u sectors from %lu\n",
	105	__func__, __LINE__, i, bio_sectors(iter.bio),
	106	iter.bio->bi_iter.bi_sector);
5705f702	107
7988613b KO	108	size = bvec.bv_len;
7988613b KO	109	buf = bvec_kmap_irq(&bvec, &flags);
6c92e699 JA	110	if (gather)
	111	memcpy(dev->bounce_buf+offset, buf, size);
	112	else
	113	memcpy(buf, dev->bounce_buf+offset, size);
	114	offset += size;
7988613b	115	flush_kernel_dcache_page(bvec.bv_page);
93055c31	116	bvec_kunmap_irq(buf, &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;
7988613b	132	struct bio_vec bv;
5705f702	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))) {
aebf526b CH	199	switch (req_op(req)) {
aebf526b CH	200	case REQ_OP_FLUSH:
c6131fa5	201	if (ps3disk_submit_flush_request(dev, req))
aebf526b CH	202	return;
	203	break;
	204	case REQ_OP_READ:
	205	case REQ_OP_WRITE:
98d8c8f4	206	if (ps3disk_submit_request_sg(dev, req))
aebf526b CH	207	return;
	208	break;
	209	default:
c6131fa5	210	blk_dump_rq_flags(req, DEVICE_NAME " bad request");
10e1e629	211	__blk_end_request_all(req, -EIO);
c6131fa5 GU	212	}
	213	}
	214	}
	215
165125e1	216	static void ps3disk_request(struct request_queue *q)
c6131fa5 GU	217	{
c6131fa5 GU	218	struct ps3_storage_device *dev = q->queuedata;
03fa68c2	219	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	220
	221	if (priv->req) {
	222	dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
	223	return;
	224	}
	225
	226	ps3disk_do_request(dev, q);
	227	}
	228
	229	static irqreturn_t ps3disk_interrupt(int irq, void *data)
	230	{
	231	struct ps3_storage_device *dev = data;
	232	struct ps3disk_private *priv;
	233	struct request *req;
f01ab252	234	int res, read, error;
c6131fa5	235	u64 tag, status;
c6131fa5 GU	236	const char *op;
	237
	238	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
	239
	240	if (tag != dev->tag)
	241	dev_err(&dev->sbd.core,
e377c6e2	242	"%s:%u: tag mismatch, got %llx, expected %llx\n",
c6131fa5 GU	243	__func__, __LINE__, tag, dev->tag);
	244
	245	if (res) {
e377c6e2	246	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
c6131fa5 GU	247	__func__, __LINE__, res, status);
	248	return IRQ_HANDLED;
	249	}
	250
03fa68c2	251	priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	252	req = priv->req;
	253	if (!req) {
	254	dev_dbg(&dev->sbd.core,
	255	"%s:%u non-block layer request completed\n", __func__,
	256	__LINE__);
	257	dev->lv1_status = status;
	258	complete(&dev->done);
	259	return IRQ_HANDLED;
	260	}
	261
3a5e02ce	262	if (req_op(req) == REQ_OP_FLUSH) {
c6131fa5	263	read = 0;
c6131fa5 GU	264	op = "flush";
	265	} else {
	266	read = !rq_data_dir(req);
c6131fa5 GU	267	op = read ? "read" : "write";
	268	}
	269	if (status) {
e377c6e2	270	dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
c6131fa5	271	__LINE__, op, status);
f01ab252	272	error = -EIO;
c6131fa5 GU	273	} else {
	274	dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
	275	__LINE__, op);
f01ab252	276	error = 0;
c6131fa5 GU	277	if (read)
	278	ps3disk_scatter_gather(dev, req, 0);
	279	}
	280
	281	spin_lock(&priv->lock);
cd4c34eb	282	__blk_end_request_all(req, error);
c6131fa5 GU	283	priv->req = NULL;
	284	ps3disk_do_request(dev, priv->queue);
	285	spin_unlock(&priv->lock);
	286
	287	return IRQ_HANDLED;
	288	}
	289
	290	static int ps3disk_sync_cache(struct ps3_storage_device *dev)
	291	{
	292	u64 res;
	293
	294	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
	295
	296	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	297	if (res) {
e377c6e2	298	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5 GU	299	__func__, __LINE__, res);
	300	return -EIO;
	301	}
	302	return 0;
	303	}
	304
	305
	306	/* ATA helpers copied from drivers/ata/libata-core.c */
	307
	308	static void swap_buf_le16(u16 *buf, unsigned int buf_words)
	309	{
	310	#ifdef __BIG_ENDIAN
	311	unsigned int i;
	312
	313	for (i = 0; i < buf_words; i++)
	314	buf[i] = le16_to_cpu(buf[i]);
	315	#endif /* __BIG_ENDIAN */
	316	}
	317
	318	static u64 ata_id_n_sectors(const u16 *id)
	319	{
	320	if (ata_id_has_lba(id)) {
	321	if (ata_id_has_lba48(id))
	322	return ata_id_u64(id, 100);
	323	else
	324	return ata_id_u32(id, 60);
	325	} else {
	326	if (ata_id_current_chs_valid(id))
	327	return ata_id_u32(id, 57);
	328	else
	329	return id[1] * id[3] * id[6];
	330	}
	331	}
	332
	333	static void ata_id_string(const u16 id, unsigned char s, unsigned int ofs,
	334	unsigned int len)
	335	{
	336	unsigned int c;
	337
	338	while (len > 0) {
	339	c = id[ofs] >> 8;
	340	*s = c;
	341	s++;
	342
	343	c = id[ofs] & 0xff;
	344	*s = c;
	345	s++;
	346
	347	ofs++;
	348	len -= 2;
	349	}
	350	}
	351
	352	static void ata_id_c_string(const u16 id, unsigned char s, unsigned int ofs,
	353	unsigned int len)
	354	{
	355	unsigned char *p;
	356
	357	WARN_ON(!(len & 1));
	358
	359	ata_id_string(id, s, ofs, len - 1);
	360
	361	p = s + strnlen(s, len - 1);
	362	while (p > s && p[-1] == ' ')
363	p--;
364	*p = '\0';
365	}
366
367	static int ps3disk_identify(struct ps3_storage_device *dev)
368	{
03fa68c2	369	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	370	struct lv1_ata_cmnd_block ata_cmnd;
	371	u16 *id = dev->bounce_buf;
	372	u64 res;
	373
	374	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
	375
	376	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
	377	ata_cmnd.command = ATA_CMD_ID_ATA;
	378	ata_cmnd.sector_count = 1;
	379	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
	380	ata_cmnd.buffer = dev->bounce_lpar;
	381	ata_cmnd.proto = PIO_DATA_IN_PROTO;
	382	ata_cmnd.in_out = DIR_READ;
	383
	384	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
	385	ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
	386	sizeof(ata_cmnd), ata_cmnd.buffer,
	387	ata_cmnd.arglen);
	388	if (res) {
e377c6e2	389	dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
c6131fa5 GU	390	__func__, __LINE__, res);
	391	return -EIO;
	392	}
	393
	394	swap_buf_le16(id, ATA_ID_WORDS);
	395
	396	/* All we're interested in are raw capacity and model name */
	397	priv->raw_capacity = ata_id_n_sectors(id);
	398	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	399	return 0;
	400	}
	401
c6131fa5 GU	402	static unsigned long ps3disk_mask;
	403
	404	static DEFINE_MUTEX(ps3disk_mask_mutex);
	405
8d85fce7	406	static int ps3disk_probe(struct ps3_system_bus_device *_dev)
c6131fa5 GU	407	{
	408	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	409	struct ps3disk_private *priv;
	410	int error;
	411	unsigned int devidx;
	412	struct request_queue *queue;
	413	struct gendisk *gendisk;
	414
	415	if (dev->blk_size < 512) {
	416	dev_err(&dev->sbd.core,
e377c6e2	417	"%s:%u: cannot handle block size %llu\n", __func__,
c6131fa5 GU	418	__LINE__, dev->blk_size);
	419	return -EINVAL;
	420	}
	421
	422	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	423	mutex_lock(&ps3disk_mask_mutex);
	424	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	425	if (devidx >= PS3DISK_MAX_DISKS) {
	426	dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
	427	__LINE__);
	428	mutex_unlock(&ps3disk_mask_mutex);
	429	return -ENOSPC;
	430	}
	431	__set_bit(devidx, &ps3disk_mask);
	432	mutex_unlock(&ps3disk_mask_mutex);
	433
	434	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	435	if (!priv) {
	436	error = -ENOMEM;
	437	goto fail;
	438	}
	439
03fa68c2	440	ps3_system_bus_set_drvdata(_dev, priv);
c6131fa5 GU	441	spin_lock_init(&priv->lock);
	442
	443	dev->bounce_size = BOUNCE_SIZE;
	444	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	445	if (!dev->bounce_buf) {
	446	error = -ENOMEM;
	447	goto fail_free_priv;
	448	}
	449
	450	error = ps3stor_setup(dev, ps3disk_interrupt);
	451	if (error)
	452	goto fail_free_bounce;
	453
	454	ps3disk_identify(dev);
	455
	456	queue = blk_init_queue(ps3disk_request, &priv->lock);
	457	if (!queue) {
	458	dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
	459	__func__, __LINE__);
	460	error = -ENOMEM;
	461	goto fail_teardown;
	462	}
	463
	464	priv->queue = queue;
	465	queue->queuedata = dev;
	466
	467	blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
	468
086fa5ff	469	blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
c6131fa5 GU	470	blk_queue_segment_boundary(queue, -1UL);
c6131fa5 GU	471	blk_queue_dma_alignment(queue, dev->blk_size-1);
e1defc4f	472	blk_queue_logical_block_size(queue, dev->blk_size);
c6131fa5	473
12c95f13	474	blk_queue_write_cache(queue, true, false);
c6131fa5	475
8a78362c	476	blk_queue_max_segments(queue, -1);
c6131fa5 GU	477	blk_queue_max_segment_size(queue, dev->bounce_size);
	478
	479	gendisk = alloc_disk(PS3DISK_MINORS);
	480	if (!gendisk) {
	481	dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
	482	__LINE__);
	483	error = -ENOMEM;
	484	goto fail_cleanup_queue;
	485	}
	486
	487	priv->gendisk = gendisk;
	488	gendisk->major = ps3disk_major;
	489	gendisk->first_minor = devidx * PS3DISK_MINORS;
	490	gendisk->fops = &ps3disk_fops;
	491	gendisk->queue = queue;
	492	gendisk->private_data = dev;
c6131fa5 GU	493	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
	494	devidx+'a');
	495	priv->blocking_factor = dev->blk_size >> 9;
	496	set_capacity(gendisk,
	497	dev->regions[dev->region_idx].size*priv->blocking_factor);
	498
	499	dev_info(&dev->sbd.core,
e377c6e2	500	"%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
c6131fa5 GU	501	gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
	502	get_capacity(gendisk) >> 11);
	503
0d52c756	504	device_add_disk(&dev->sbd.core, gendisk);
c6131fa5 GU	505	return 0;
	506
	507	fail_cleanup_queue:
	508	blk_cleanup_queue(queue);
	509	fail_teardown:
	510	ps3stor_teardown(dev);
	511	fail_free_bounce:
	512	kfree(dev->bounce_buf);
	513	fail_free_priv:
	514	kfree(priv);
03fa68c2	515	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	516	fail:
	517	mutex_lock(&ps3disk_mask_mutex);
	518	__clear_bit(devidx, &ps3disk_mask);
	519	mutex_unlock(&ps3disk_mask_mutex);
	520	return error;
	521	}
	522
	523	static int ps3disk_remove(struct ps3_system_bus_device *_dev)
	524	{
	525	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
03fa68c2	526	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	527
c6131fa5 GU	528	mutex_lock(&ps3disk_mask_mutex);
f331c029	529	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
c6131fa5 GU	530	&ps3disk_mask);
	531	mutex_unlock(&ps3disk_mask_mutex);
	532	del_gendisk(priv->gendisk);
	533	blk_cleanup_queue(priv->queue);
	534	put_disk(priv->gendisk);
	535	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
	536	ps3disk_sync_cache(dev);
	537	ps3stor_teardown(dev);
	538	kfree(dev->bounce_buf);
	539	kfree(priv);
03fa68c2	540	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	541	return 0;
	542	}
	543
	544	static struct ps3_system_bus_driver ps3disk = {
	545	.match_id = PS3_MATCH_ID_STOR_DISK,
	546	.core.name = DEVICE_NAME,
	547	.core.owner = THIS_MODULE,
	548	.probe = ps3disk_probe,
	549	.remove = ps3disk_remove,
	550	.shutdown = ps3disk_remove,
	551	};
	552
	553
	554	static int __init ps3disk_init(void)
	555	{
	556	int error;
	557
	558	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
	559	return -ENODEV;
	560
	561	error = register_blkdev(0, DEVICE_NAME);
	562	if (error <= 0) {
	563	printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
	564	__LINE__, error);
	565	return error;
	566	}
	567	ps3disk_major = error;
	568
	569	pr_info("%s:%u: registered block device major %d\n", __func__,
	570	__LINE__, ps3disk_major);
	571
	572	error = ps3_system_bus_driver_register(&ps3disk);
	573	if (error)
	574	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	575
	576	return error;
	577	}
	578
	579	static void __exit ps3disk_exit(void)
	580	{
	581	ps3_system_bus_driver_unregister(&ps3disk);
	582	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	583	}
	584
	585	module_init(ps3disk_init);
	586	module_exit(ps3disk_exit);
	587
	588	MODULE_LICENSE("GPL");
	589	MODULE_DESCRIPTION("PS3 Disk Storage Driver");
	590	MODULE_AUTHOR("Sony Corporation");
	591	MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);