[deliverable/linux.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),
			(unsigned long)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 %lu sectors %lu hard sectors\n",
		__func__, __LINE__, op, n, req->nr_sectors,
		req->hard_nr_sectors);
#endif

	start_sector = req->sector * priv->blocking_factor;
	sectors = req->nr_sectors * priv->blocking_factor;
	dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\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);
		end_request(req, 0);
		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%lx\n",
			__func__, __LINE__, res);
		end_request(req, 0);
		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_FLUSH) {
			if (ps3disk_submit_flush_request(dev, req))
				break;
		} else {
			blk_dump_rq_flags(req, DEVICE_NAME " bad request");
			end_request(req, 0);
			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, uptodate;
	u64 tag, status;
	unsigned long num_sectors;
	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 %lx, expected %lx\n",
			__func__, __LINE__, tag, dev->tag);

	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\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_FLUSH) {
		read = 0;
		num_sectors = req->hard_cur_sectors;
		op = "flush";
	} else {
		read = !rq_data_dir(req);
		num_sectors = req->nr_sectors;
		op = read ? "read" : "write";
	}
	if (status) {
		dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
			__LINE__, op, status);
		uptodate = 0;
	} else {
		dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
			__LINE__, op);
		uptodate = 1;
		if (read)
			ps3disk_scatter_gather(dev, req, 0);
	}

	spin_lock(&priv->lock);
	if (!end_that_request_first(req, uptodate, num_sectors)) {
		add_disk_randomness(req->rq_disk);
		blkdev_dequeue_request(req);
		end_that_request_last(req, uptodate);
	}
	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%lx\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%lx\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__);

	memset(req->cmd, 0, sizeof(req->cmd));
	req->cmd_type = REQ_TYPE_FLUSH;
}

static int ps3disk_issue_flush(struct request_queue *q, struct gendisk *gendisk,
			       sector_t *sector)
{
	struct ps3_storage_device *dev = q->queuedata;
	struct request *req;
	int res;

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

	req = blk_get_request(q, WRITE, __GFP_WAIT);
	ps3disk_prepare_flush(q, req);
	res = blk_execute_rq(q, gendisk, req, 0);
	if (res)
		dev_err(&dev->sbd.core, "%s:%u: flush request failed %d\n",
			__func__, __LINE__, res);
	blk_put_request(req);
	return res;
}


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 %lu\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_issue_flush_fn(queue, ps3disk_issue_flush);
	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 (%lu 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(priv->gendisk->first_minor / 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 N	104	__func__, __LINE__, i, bio_segments(iter.bio),
	105	bio_sectors(iter.bio),
	106	(unsigned long)iter.bio->bi_sector);
	107
c6131fa5	108	size = bvec->bv_len;
5705f702	109	buf = bvec_kmap_irq(bvec, &flags);
c6131fa5 GU	110	if (gather)
	111	memcpy(dev->bounce_buf+offset, buf, size);
	112	else
	113	memcpy(buf, dev->bounce_buf+offset, size);
	114	offset += size;
5705f702 N	115	flush_kernel_dcache_page(bvec->bv_page);
	116	bvec_kunmap_irq(bvec, &flags);
	117
c6131fa5 GU	118	i++;
	119	}
	120	}
	121
	122	static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
	123	struct request *req)
	124	{
	125	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	126	int write = rq_data_dir(req), res;
	127	const char *op = write ? "write" : "read";
	128	u64 start_sector, sectors;
	129	unsigned int region_id = dev->regions[dev->region_idx].id;
	130
	131	#ifdef DEBUG
	132	unsigned int n = 0;
5705f702 N	133	struct bio_vec *bv;
5705f702 N	134	struct req_iterator iter;
c6131fa5	135
5705f702	136	rq_for_each_segment(bv, req, iter)
c6131fa5 GU	137	n++;
c6131fa5 GU	138	dev_dbg(&dev->sbd.core,
5705f702	139	"%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
c6131fa5 GU	140	__func__, __LINE__, op, n, req->nr_sectors,
	141	req->hard_nr_sectors);
	142	#endif
	143
	144	start_sector = req->sector * priv->blocking_factor;
	145	sectors = req->nr_sectors * priv->blocking_factor;
	146	dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\n",
	147	__func__, __LINE__, op, sectors, start_sector);
	148
	149	if (write) {
	150	ps3disk_scatter_gather(dev, req, 1);
	151
	152	res = lv1_storage_write(dev->sbd.dev_id, region_id,
	153	start_sector, sectors, 0,
	154	dev->bounce_lpar, &dev->tag);
	155	} else {
	156	res = lv1_storage_read(dev->sbd.dev_id, region_id,
	157	start_sector, sectors, 0,
	158	dev->bounce_lpar, &dev->tag);
	159	}
	160	if (res) {
	161	dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
	162	__LINE__, op, res);
	163	end_request(req, 0);
	164	return 0;
	165	}
	166
	167	priv->req = req;
	168	return 1;
	169	}
	170
	171	static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
	172	struct request *req)
	173	{
	174	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	175	u64 res;
	176
	177	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
	178
	179	res = lv1_storage_send_device_command(dev->sbd.dev_id,
	180	LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
	181	0, &dev->tag);
	182	if (res) {
	183	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
	184	__func__, __LINE__, res);
	185	end_request(req, 0);
	186	return 0;
	187	}
	188
	189	priv->req = req;
	190	return 1;
	191	}
	192
	193	static void ps3disk_do_request(struct ps3_storage_device *dev,
165125e1	194	struct request_queue *q)
c6131fa5 GU	195	{
	196	struct request *req;
	197
	198	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	199
	200	while ((req = elv_next_request(q))) {
	201	if (blk_fs_request(req)) {
	202	if (ps3disk_submit_request_sg(dev, req))
	203	break;
	204	} else if (req->cmd_type == REQ_TYPE_FLUSH) {
	205	if (ps3disk_submit_flush_request(dev, req))
	206	break;
	207	} else {
	208	blk_dump_rq_flags(req, DEVICE_NAME " bad request");
	209	end_request(req, 0);
	210	continue;
	211	}
	212	}
	213	}
	214
165125e1	215	static void ps3disk_request(struct request_queue *q)
c6131fa5 GU	216	{
	217	struct ps3_storage_device *dev = q->queuedata;
	218	struct ps3disk_private *priv = dev->sbd.core.driver_data;
	219
	220	if (priv->req) {
	221	dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
	222	return;
	223	}
	224
	225	ps3disk_do_request(dev, q);
	226	}
	227
	228	static irqreturn_t ps3disk_interrupt(int irq, void *data)
	229	{
	230	struct ps3_storage_device *dev = data;
	231	struct ps3disk_private *priv;
	232	struct request *req;
	233	int res, read, uptodate;
	234	u64 tag, status;
	235	unsigned long num_sectors;
	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,
	242	"%s:%u: tag mismatch, got %lx, expected %lx\n",
	243	__func__, __LINE__, tag, dev->tag);
	244
	245	if (res) {
	246	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
	247	__func__, __LINE__, res, status);
	248	return IRQ_HANDLED;
	249	}
	250
	251	priv = dev->sbd.core.driver_data;
	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
	262	if (req->cmd_type == REQ_TYPE_FLUSH) {
	263	read = 0;
	264	num_sectors = req->hard_cur_sectors;
	265	op = "flush";
	266	} else {
	267	read = !rq_data_dir(req);
	268	num_sectors = req->nr_sectors;
	269	op = read ? "read" : "write";
	270	}
	271	if (status) {
	272	dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
	273	__LINE__, op, status);
	274	uptodate = 0;
	275	} else {
	276	dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
	277	__LINE__, op);
	278	uptodate = 1;
	279	if (read)
280	ps3disk_scatter_gather(dev, req, 0);
281	}
282
283	spin_lock(&priv->lock);
284	if (!end_that_request_first(req, uptodate, num_sectors)) {
285	add_disk_randomness(req->rq_disk);
286	blkdev_dequeue_request(req);
287	end_that_request_last(req, uptodate);
288	}
289	priv->req = NULL;
290	ps3disk_do_request(dev, priv->queue);
291	spin_unlock(&priv->lock);
292
293	return IRQ_HANDLED;
294	}
295
296	static int ps3disk_sync_cache(struct ps3_storage_device *dev)
297	{
298	u64 res;
299
300	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
301
302	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
303	if (res) {
304	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
305	__func__, __LINE__, res);
306	return -EIO;
307	}
308	return 0;
309	}
310
311
312	/* ATA helpers copied from drivers/ata/libata-core.c */
313
314	static void swap_buf_le16(u16 *buf, unsigned int buf_words)
315	{
316	#ifdef __BIG_ENDIAN
317	unsigned int i;
318
319	for (i = 0; i < buf_words; i++)
320	buf[i] = le16_to_cpu(buf[i]);
321	#endif /* __BIG_ENDIAN */
322	}
323
324	static u64 ata_id_n_sectors(const u16 *id)
325	{
326	if (ata_id_has_lba(id)) {
327	if (ata_id_has_lba48(id))
328	return ata_id_u64(id, 100);
329	else
330	return ata_id_u32(id, 60);
331	} else {
332	if (ata_id_current_chs_valid(id))
333	return ata_id_u32(id, 57);
334	else
335	return id[1] * id[3] * id[6];
336	}
337	}
338
339	static void ata_id_string(const u16 id, unsigned char s, unsigned int ofs,
340	unsigned int len)
341	{
342	unsigned int c;
343
344	while (len > 0) {
345	c = id[ofs] >> 8;
346	*s = c;
347	s++;
348
349	c = id[ofs] & 0xff;
350	*s = c;
351	s++;
352
353	ofs++;
354	len -= 2;
355	}
356	}
357
358	static void ata_id_c_string(const u16 id, unsigned char s, unsigned int ofs,
359	unsigned int len)
360	{
361	unsigned char *p;
362
363	WARN_ON(!(len & 1));
364
365	ata_id_string(id, s, ofs, len - 1);
366
367	p = s + strnlen(s, len - 1);
368	while (p > s && p[-1] == ' ')
369	p--;
370	*p = '\0';
371	}
372
373	static int ps3disk_identify(struct ps3_storage_device *dev)
374	{
375	struct ps3disk_private *priv = dev->sbd.core.driver_data;
376	struct lv1_ata_cmnd_block ata_cmnd;
377	u16 *id = dev->bounce_buf;
378	u64 res;
379
380	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
381
382	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
383	ata_cmnd.command = ATA_CMD_ID_ATA;
384	ata_cmnd.sector_count = 1;
385	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
386	ata_cmnd.buffer = dev->bounce_lpar;
387	ata_cmnd.proto = PIO_DATA_IN_PROTO;
388	ata_cmnd.in_out = DIR_READ;
389
390	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
391	ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
392	sizeof(ata_cmnd), ata_cmnd.buffer,
393	ata_cmnd.arglen);
394	if (res) {
395	dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%lx\n",
396	__func__, __LINE__, res);
397	return -EIO;
398	}
399
400	swap_buf_le16(id, ATA_ID_WORDS);
401
402	/* All we're interested in are raw capacity and model name */
403	priv->raw_capacity = ata_id_n_sectors(id);
404	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
405	return 0;
406	}
407
165125e1	408	static void ps3disk_prepare_flush(struct request_queue q, struct request req)
c6131fa5 GU	409	{
	410	struct ps3_storage_device *dev = q->queuedata;
	411
	412	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	413
	414	memset(req->cmd, 0, sizeof(req->cmd));
	415	req->cmd_type = REQ_TYPE_FLUSH;
	416	}
	417
165125e1	418	static int ps3disk_issue_flush(struct request_queue q, struct gendisk gendisk,
c6131fa5 GU	419	sector_t *sector)
	420	{
	421	struct ps3_storage_device *dev = q->queuedata;
	422	struct request *req;
	423	int res;
	424
	425	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
	426
	427	req = blk_get_request(q, WRITE, __GFP_WAIT);
	428	ps3disk_prepare_flush(q, req);
	429	res = blk_execute_rq(q, gendisk, req, 0);
	430	if (res)
	431	dev_err(&dev->sbd.core, "%s:%u: flush request failed %d\n",
	432	__func__, __LINE__, res);
	433	blk_put_request(req);
	434	return res;
	435	}
	436
	437
	438	static unsigned long ps3disk_mask;
	439
	440	static DEFINE_MUTEX(ps3disk_mask_mutex);
	441
	442	static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
	443	{
	444	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	445	struct ps3disk_private *priv;
	446	int error;
	447	unsigned int devidx;
	448	struct request_queue *queue;
	449	struct gendisk *gendisk;
	450
	451	if (dev->blk_size < 512) {
	452	dev_err(&dev->sbd.core,
	453	"%s:%u: cannot handle block size %lu\n", __func__,
	454	__LINE__, dev->blk_size);
	455	return -EINVAL;
	456	}
	457
	458	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	459	mutex_lock(&ps3disk_mask_mutex);
	460	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	461	if (devidx >= PS3DISK_MAX_DISKS) {
	462	dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
	463	__LINE__);
	464	mutex_unlock(&ps3disk_mask_mutex);
	465	return -ENOSPC;
	466	}
	467	__set_bit(devidx, &ps3disk_mask);
	468	mutex_unlock(&ps3disk_mask_mutex);
	469
	470	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	471	if (!priv) {
	472	error = -ENOMEM;
	473	goto fail;
	474	}
	475
	476	dev->sbd.core.driver_data = priv;
	477	spin_lock_init(&priv->lock);
	478
	479	dev->bounce_size = BOUNCE_SIZE;
	480	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	481	if (!dev->bounce_buf) {
	482	error = -ENOMEM;
483	goto fail_free_priv;
484	}
485
486	error = ps3stor_setup(dev, ps3disk_interrupt);
487	if (error)
488	goto fail_free_bounce;
489
490	ps3disk_identify(dev);
491
492	queue = blk_init_queue(ps3disk_request, &priv->lock);
493	if (!queue) {
494	dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
495	__func__, __LINE__);
496	error = -ENOMEM;
497	goto fail_teardown;
498	}
499
500	priv->queue = queue;
501	queue->queuedata = dev;
502
503	blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
504
505	blk_queue_max_sectors(queue, dev->bounce_size >> 9);
506	blk_queue_segment_boundary(queue, -1UL);
507	blk_queue_dma_alignment(queue, dev->blk_size-1);
508	blk_queue_hardsect_size(queue, dev->blk_size);
509
510	blk_queue_issue_flush_fn(queue, ps3disk_issue_flush);
511	blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
512	ps3disk_prepare_flush);
513
514	blk_queue_max_phys_segments(queue, -1);
515	blk_queue_max_hw_segments(queue, -1);
516	blk_queue_max_segment_size(queue, dev->bounce_size);
517
518	gendisk = alloc_disk(PS3DISK_MINORS);
519	if (!gendisk) {
520	dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
521	__LINE__);
522	error = -ENOMEM;
523	goto fail_cleanup_queue;
524	}
525
526	priv->gendisk = gendisk;
527	gendisk->major = ps3disk_major;
528	gendisk->first_minor = devidx * PS3DISK_MINORS;
529	gendisk->fops = &ps3disk_fops;
530	gendisk->queue = queue;
531	gendisk->private_data = dev;
532	gendisk->driverfs_dev = &dev->sbd.core;
533	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
534	devidx+'a');
535	priv->blocking_factor = dev->blk_size >> 9;
536	set_capacity(gendisk,
537	dev->regions[dev->region_idx].size*priv->blocking_factor);
538
539	dev_info(&dev->sbd.core,
540	"%s is a %s (%lu MiB total, %lu MiB for OtherOS)\n",
541	gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
542	get_capacity(gendisk) >> 11);
543
544	add_disk(gendisk);
545	return 0;
546
547	fail_cleanup_queue:
548	blk_cleanup_queue(queue);
549	fail_teardown:
550	ps3stor_teardown(dev);
551	fail_free_bounce:
552	kfree(dev->bounce_buf);
553	fail_free_priv:
554	kfree(priv);
555	dev->sbd.core.driver_data = NULL;
556	fail:
557	mutex_lock(&ps3disk_mask_mutex);
558	__clear_bit(devidx, &ps3disk_mask);
559	mutex_unlock(&ps3disk_mask_mutex);
560	return error;
561	}
562
563	static int ps3disk_remove(struct ps3_system_bus_device *_dev)
564	{
565	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
566	struct ps3disk_private *priv = dev->sbd.core.driver_data;
567
568	mutex_lock(&ps3disk_mask_mutex);
569	__clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS,
570	&ps3disk_mask);
571	mutex_unlock(&ps3disk_mask_mutex);
572	del_gendisk(priv->gendisk);
573	blk_cleanup_queue(priv->queue);
574	put_disk(priv->gendisk);
575	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
576	ps3disk_sync_cache(dev);
577	ps3stor_teardown(dev);
578	kfree(dev->bounce_buf);
579	kfree(priv);
580	dev->sbd.core.driver_data = NULL;
581	return 0;
582	}
583
584	static struct ps3_system_bus_driver ps3disk = {
585	.match_id = PS3_MATCH_ID_STOR_DISK,
586	.core.name = DEVICE_NAME,
587	.core.owner = THIS_MODULE,
588	.probe = ps3disk_probe,
589	.remove = ps3disk_remove,
590	.shutdown = ps3disk_remove,
591	};
592
593
594	static int __init ps3disk_init(void)
595	{
596	int error;
597
598	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
599	return -ENODEV;
600
601	error = register_blkdev(0, DEVICE_NAME);
602	if (error <= 0) {
603	printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
604	__LINE__, error);
605	return error;
606	}
607	ps3disk_major = error;
608
609	pr_info("%s:%u: registered block device major %d\n", __func__,
610	__LINE__, ps3disk_major);
611
612	error = ps3_system_bus_driver_register(&ps3disk);
613	if (error)
614	unregister_blkdev(ps3disk_major, DEVICE_NAME);
615
616	return error;
617	}
618
619	static void __exit ps3disk_exit(void)
620	{
621	ps3_system_bus_driver_unregister(&ps3disk);
622	unregister_blkdev(ps3disk_major, DEVICE_NAME);
623	}
624
625	module_init(ps3disk_init);
626	module_exit(ps3disk_exit);
627
628	MODULE_LICENSE("GPL");
629	MODULE_DESCRIPTION("PS3 Disk Storage Driver");
630	MODULE_AUTHOR("Sony Corporation");
631	MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);