[linux-2.6-block.git] / drivers / block / ps3disk.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * PS3 Disk Storage Driver
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2007 Sony Corp.
 */

#include <linux/ata.h>
#include <linux/blk-mq.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 blk_mq_tag_set tag_set;
	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 %llu\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 blk_status_t 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);
		return BLK_STS_IOERR;
	}

	priv->req = req;
	return BLK_STS_OK;
}

static blk_status_t 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);
		return BLK_STS_IOERR;
	}

	priv->req = req;
	return BLK_STS_OK;
}

static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev,
				       struct request *req)
{
	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);

	switch (req_op(req)) {
	case REQ_OP_FLUSH:
		return ps3disk_submit_flush_request(dev, req);
	case REQ_OP_READ:
	case REQ_OP_WRITE:
		return ps3disk_submit_request_sg(dev, req);
	default:
		blk_dump_rq_flags(req, DEVICE_NAME " bad request");
		return BLK_STS_IOERR;
	}
}

static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx,
				     const struct blk_mq_queue_data *bd)
{
	struct request_queue *q = hctx->queue;
	struct ps3_storage_device *dev = q->queuedata;
	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	blk_status_t ret;

	blk_mq_start_request(bd->rq);

	spin_lock_irq(&priv->lock);
	ret = ps3disk_do_request(dev, bd->rq);
	spin_unlock_irq(&priv->lock);

	return ret;
}

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;
	blk_status_t 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 = BLK_STS_IOERR;
	} 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);
	priv->req = NULL;
	blk_mq_end_request(req, error);
	spin_unlock(&priv->lock);

	blk_mq_run_hw_queues(priv->queue, true);
	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 const struct blk_mq_ops ps3disk_mq_ops = {
	.queue_rq	= ps3disk_queue_rq,
};

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_mq_init_sq_queue(&priv->tag_set, &ps3disk_mq_ops, 1,
					BLK_MQ_F_SHOULD_MERGE);
	if (IS_ERR(queue)) {
		dev_err(&dev->sbd.core, "%s:%u: blk_mq_init_queue failed\n",
			__func__, __LINE__);
		error = PTR_ERR(queue);
		goto fail_teardown;
	}

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

	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, %llu MiB for OtherOS)\n",
		 gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
		 get_capacity(gendisk) >> 11);

	device_add_disk(&dev->sbd.core, gendisk, NULL);
	return 0;

fail_cleanup_queue:
	blk_cleanup_queue(queue);
	blk_mq_free_tag_set(&priv->tag_set);
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);
	blk_mq_free_tag_set(&priv->tag_set);
	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
935912c5	1	// SPDX-License-Identifier: GPL-2.0-only
c6131fa5 GU	2	/*
	3	* PS3 Disk Storage Driver
	4	*
	5	* Copyright (C) 2007 Sony Computer Entertainment Inc.
	6	* Copyright 2007 Sony Corp.
c6131fa5 GU	7	*/
	8
	9	#include <linux/ata.h>
fab1adcf	10	#include <linux/blk-mq.h>
5a0e3ad6	11	#include <linux/slab.h>
0c8d44f2	12	#include <linux/module.h>
c6131fa5 GU	13
	14	#include <asm/lv1call.h>
	15	#include <asm/ps3stor.h>
	16	#include <asm/firmware.h>
	17
	18
	19	#define DEVICE_NAME "ps3disk"
	20
	21	#define BOUNCE_SIZE (64*1024)
	22
	23	#define PS3DISK_MAX_DISKS 16
	24	#define PS3DISK_MINORS 16
	25
	26
	27	#define PS3DISK_NAME "ps3d%c"
	28
	29
	30	struct ps3disk_private {
	31	spinlock_t lock; /* Request queue spinlock */
	32	struct request_queue *queue;
fab1adcf	33	struct blk_mq_tag_set tag_set;
c6131fa5 GU	34	struct gendisk *gendisk;
	35	unsigned int blocking_factor;
	36	struct request *req;
	37	u64 raw_capacity;
	38	unsigned char model[ATA_ID_PROD_LEN+1];
	39	};
	40
	41
	42	#define LV1_STORAGE_SEND_ATA_COMMAND (2)
	43	#define LV1_STORAGE_ATA_HDDOUT (0x23)
	44
	45	struct lv1_ata_cmnd_block {
	46	u16 features;
	47	u16 sector_count;
	48	u16 LBA_low;
	49	u16 LBA_mid;
	50	u16 LBA_high;
	51	u8 device;
	52	u8 command;
	53	u32 is_ext;
	54	u32 proto;
	55	u32 in_out;
	56	u32 size;
	57	u64 buffer;
	58	u32 arglen;
	59	};
	60
	61	enum lv1_ata_proto {
	62	NON_DATA_PROTO = 0,
	63	PIO_DATA_IN_PROTO = 1,
	64	PIO_DATA_OUT_PROTO = 2,
	65	DMA_PROTO = 3
	66	};
	67
	68	enum lv1_ata_in_out {
	69	DIR_WRITE = 0, /* memory -> device */
	70	DIR_READ = 1 /* device -> memory */
	71	};
	72
	73	static int ps3disk_major;
	74
	75
83d5cde4	76	static const struct block_device_operations ps3disk_fops = {
c6131fa5 GU	77	.owner = THIS_MODULE,
	78	};
	79
	80
	81	static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
	82	struct request *req, int gather)
	83	{
	84	unsigned int offset = 0;
5705f702	85	struct req_iterator iter;
7988613b	86	struct bio_vec bvec;
5705f702	87	unsigned int i = 0;
c6131fa5 GU	88	size_t size;
	89	void *buf;
	90
5705f702 N	91	rq_for_each_segment(bvec, req, iter) {
5705f702 N	92	unsigned long flags;
72deb455	93	dev_dbg(&dev->sbd.core, "%s:%u: bio %u: %u sectors from %llu\n",
458b76ed KO	94	__func__, __LINE__, i, bio_sectors(iter.bio),
458b76ed KO	95	iter.bio->bi_iter.bi_sector);
5705f702	96
7988613b KO	97	size = bvec.bv_len;
7988613b KO	98	buf = bvec_kmap_irq(&bvec, &flags);
6c92e699 JA	99	if (gather)
	100	memcpy(dev->bounce_buf+offset, buf, size);
	101	else
	102	memcpy(buf, dev->bounce_buf+offset, size);
	103	offset += size;
7988613b	104	flush_kernel_dcache_page(bvec.bv_page);
93055c31	105	bvec_kunmap_irq(buf, &flags);
c6131fa5 GU	106	i++;
	107	}
	108	}
	109
fab1adcf JA	110	static blk_status_t ps3disk_submit_request_sg(struct ps3_storage_device *dev,
fab1adcf JA	111	struct request *req)
c6131fa5	112	{
03fa68c2	113	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	114	int write = rq_data_dir(req), res;
	115	const char *op = write ? "write" : "read";
	116	u64 start_sector, sectors;
	117	unsigned int region_id = dev->regions[dev->region_idx].id;
	118
	119	#ifdef DEBUG
	120	unsigned int n = 0;
7988613b	121	struct bio_vec bv;
5705f702	122	struct req_iterator iter;
c6131fa5	123
5705f702	124	rq_for_each_segment(bv, req, iter)
c6131fa5 GU	125	n++;
c6131fa5 GU	126	dev_dbg(&dev->sbd.core,
83096ebf TH	127	"%s:%u: %s req has %u bvecs for %u sectors\n",
83096ebf TH	128	__func__, __LINE__, op, n, blk_rq_sectors(req));
c6131fa5 GU	129	#endif
c6131fa5 GU	130
83096ebf TH	131	start_sector = blk_rq_pos(req) * priv->blocking_factor;
83096ebf TH	132	sectors = blk_rq_sectors(req) * priv->blocking_factor;
e377c6e2	133	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
c6131fa5 GU	134	__func__, __LINE__, op, sectors, start_sector);
	135
	136	if (write) {
	137	ps3disk_scatter_gather(dev, req, 1);
	138
	139	res = lv1_storage_write(dev->sbd.dev_id, region_id,
	140	start_sector, sectors, 0,
	141	dev->bounce_lpar, &dev->tag);
	142	} else {
	143	res = lv1_storage_read(dev->sbd.dev_id, region_id,
	144	start_sector, sectors, 0,
	145	dev->bounce_lpar, &dev->tag);
	146	}
	147	if (res) {
	148	dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
	149	__LINE__, op, res);
fab1adcf	150	return BLK_STS_IOERR;
c6131fa5 GU	151	}
	152
	153	priv->req = req;
fab1adcf	154	return BLK_STS_OK;
c6131fa5 GU	155	}
c6131fa5 GU	156
fab1adcf JA	157	static blk_status_t ps3disk_submit_flush_request(struct ps3_storage_device *dev,
fab1adcf JA	158	struct request *req)
c6131fa5	159	{
03fa68c2	160	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	161	u64 res;
	162
	163	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
	164
	165	res = lv1_storage_send_device_command(dev->sbd.dev_id,
	166	LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
	167	0, &dev->tag);
	168	if (res) {
e377c6e2	169	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5	170	__func__, __LINE__, res);
fab1adcf	171	return BLK_STS_IOERR;
c6131fa5 GU	172	}
	173
	174	priv->req = req;
fab1adcf	175	return BLK_STS_OK;
c6131fa5 GU	176	}
c6131fa5 GU	177
fab1adcf JA	178	static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev,
fab1adcf JA	179	struct request *req)
c6131fa5	180	{
c6131fa5 GU	181	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
c6131fa5 GU	182
fab1adcf JA	183	switch (req_op(req)) {
	184	case REQ_OP_FLUSH:
	185	return ps3disk_submit_flush_request(dev, req);
	186	case REQ_OP_READ:
	187	case REQ_OP_WRITE:
	188	return ps3disk_submit_request_sg(dev, req);
	189	default:
	190	blk_dump_rq_flags(req, DEVICE_NAME " bad request");
	191	return BLK_STS_IOERR;
c6131fa5 GU	192	}
	193	}
	194
fab1adcf JA	195	static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx,
fab1adcf JA	196	const struct blk_mq_queue_data *bd)
c6131fa5	197	{
fab1adcf	198	struct request_queue *q = hctx->queue;
c6131fa5	199	struct ps3_storage_device *dev = q->queuedata;
03fa68c2	200	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
fab1adcf	201	blk_status_t ret;
c6131fa5	202
fab1adcf JA	203	blk_mq_start_request(bd->rq);
	204
	205	spin_lock_irq(&priv->lock);
	206	ret = ps3disk_do_request(dev, bd->rq);
	207	spin_unlock_irq(&priv->lock);
c6131fa5	208
fab1adcf	209	return ret;
c6131fa5 GU	210	}
	211
	212	static irqreturn_t ps3disk_interrupt(int irq, void *data)
	213	{
	214	struct ps3_storage_device *dev = data;
	215	struct ps3disk_private *priv;
	216	struct request *req;
2a842aca CH	217	int res, read;
2a842aca CH	218	blk_status_t error;
c6131fa5	219	u64 tag, status;
c6131fa5 GU	220	const char *op;
	221
	222	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
	223
	224	if (tag != dev->tag)
	225	dev_err(&dev->sbd.core,
e377c6e2	226	"%s:%u: tag mismatch, got %llx, expected %llx\n",
c6131fa5 GU	227	__func__, __LINE__, tag, dev->tag);
	228
	229	if (res) {
e377c6e2	230	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
c6131fa5 GU	231	__func__, __LINE__, res, status);
	232	return IRQ_HANDLED;
	233	}
	234
03fa68c2	235	priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	236	req = priv->req;
	237	if (!req) {
	238	dev_dbg(&dev->sbd.core,
	239	"%s:%u non-block layer request completed\n", __func__,
	240	__LINE__);
	241	dev->lv1_status = status;
	242	complete(&dev->done);
	243	return IRQ_HANDLED;
	244	}
	245
3a5e02ce	246	if (req_op(req) == REQ_OP_FLUSH) {
c6131fa5	247	read = 0;
c6131fa5 GU	248	op = "flush";
	249	} else {
	250	read = !rq_data_dir(req);
c6131fa5 GU	251	op = read ? "read" : "write";
	252	}
	253	if (status) {
e377c6e2	254	dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
c6131fa5	255	__LINE__, op, status);
2a842aca	256	error = BLK_STS_IOERR;
c6131fa5 GU	257	} else {
	258	dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
	259	__LINE__, op);
f01ab252	260	error = 0;
c6131fa5 GU	261	if (read)
	262	ps3disk_scatter_gather(dev, req, 0);
	263	}
	264
	265	spin_lock(&priv->lock);
c6131fa5	266	priv->req = NULL;
fab1adcf	267	blk_mq_end_request(req, error);
c6131fa5 GU	268	spin_unlock(&priv->lock);
c6131fa5 GU	269
fab1adcf	270	blk_mq_run_hw_queues(priv->queue, true);
c6131fa5 GU	271	return IRQ_HANDLED;
	272	}
	273
	274	static int ps3disk_sync_cache(struct ps3_storage_device *dev)
	275	{
	276	u64 res;
	277
	278	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
	279
	280	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	281	if (res) {
e377c6e2	282	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5 GU	283	__func__, __LINE__, res);
	284	return -EIO;
	285	}
	286	return 0;
	287	}
	288
	289
	290	/* ATA helpers copied from drivers/ata/libata-core.c */
	291
	292	static void swap_buf_le16(u16 *buf, unsigned int buf_words)
	293	{
	294	#ifdef __BIG_ENDIAN
	295	unsigned int i;
	296
	297	for (i = 0; i < buf_words; i++)
	298	buf[i] = le16_to_cpu(buf[i]);
	299	#endif /* __BIG_ENDIAN */
	300	}
	301
	302	static u64 ata_id_n_sectors(const u16 *id)
	303	{
	304	if (ata_id_has_lba(id)) {
	305	if (ata_id_has_lba48(id))
	306	return ata_id_u64(id, 100);
	307	else
	308	return ata_id_u32(id, 60);
	309	} else {
	310	if (ata_id_current_chs_valid(id))
	311	return ata_id_u32(id, 57);
	312	else
	313	return id[1] * id[3] * id[6];
	314	}
	315	}
	316
	317	static void ata_id_string(const u16 id, unsigned char s, unsigned int ofs,
	318	unsigned int len)
	319	{
	320	unsigned int c;
	321
	322	while (len > 0) {
	323	c = id[ofs] >> 8;
	324	*s = c;
	325	s++;
	326
	327	c = id[ofs] & 0xff;
	328	*s = c;
	329	s++;
	330
	331	ofs++;
	332	len -= 2;
	333	}
	334	}
	335
	336	static void ata_id_c_string(const u16 id, unsigned char s, unsigned int ofs,
	337	unsigned int len)
	338	{
	339	unsigned char *p;
	340
	341	WARN_ON(!(len & 1));
	342
	343	ata_id_string(id, s, ofs, len - 1);
	344
	345	p = s + strnlen(s, len - 1);
	346	while (p > s && p[-1] == ' ')
347	p--;
348	*p = '\0';
349	}
350
351	static int ps3disk_identify(struct ps3_storage_device *dev)
352	{
03fa68c2	353	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	354	struct lv1_ata_cmnd_block ata_cmnd;
	355	u16 *id = dev->bounce_buf;
	356	u64 res;
	357
	358	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
	359
	360	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
	361	ata_cmnd.command = ATA_CMD_ID_ATA;
	362	ata_cmnd.sector_count = 1;
	363	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
	364	ata_cmnd.buffer = dev->bounce_lpar;
	365	ata_cmnd.proto = PIO_DATA_IN_PROTO;
	366	ata_cmnd.in_out = DIR_READ;
	367
	368	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
	369	ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
	370	sizeof(ata_cmnd), ata_cmnd.buffer,
	371	ata_cmnd.arglen);
	372	if (res) {
e377c6e2	373	dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
c6131fa5 GU	374	__func__, __LINE__, res);
	375	return -EIO;
	376	}
	377
	378	swap_buf_le16(id, ATA_ID_WORDS);
	379
	380	/* All we're interested in are raw capacity and model name */
	381	priv->raw_capacity = ata_id_n_sectors(id);
	382	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	383	return 0;
	384	}
	385
c6131fa5 GU	386	static unsigned long ps3disk_mask;
	387
	388	static DEFINE_MUTEX(ps3disk_mask_mutex);
	389
fab1adcf JA	390	static const struct blk_mq_ops ps3disk_mq_ops = {
	391	.queue_rq = ps3disk_queue_rq,
	392	};
	393
8d85fce7	394	static int ps3disk_probe(struct ps3_system_bus_device *_dev)
c6131fa5 GU	395	{
	396	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	397	struct ps3disk_private *priv;
	398	int error;
	399	unsigned int devidx;
	400	struct request_queue *queue;
	401	struct gendisk *gendisk;
	402
	403	if (dev->blk_size < 512) {
	404	dev_err(&dev->sbd.core,
e377c6e2	405	"%s:%u: cannot handle block size %llu\n", __func__,
c6131fa5 GU	406	__LINE__, dev->blk_size);
	407	return -EINVAL;
	408	}
	409
	410	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	411	mutex_lock(&ps3disk_mask_mutex);
	412	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	413	if (devidx >= PS3DISK_MAX_DISKS) {
	414	dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
	415	__LINE__);
	416	mutex_unlock(&ps3disk_mask_mutex);
	417	return -ENOSPC;
	418	}
	419	__set_bit(devidx, &ps3disk_mask);
	420	mutex_unlock(&ps3disk_mask_mutex);
	421
	422	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	423	if (!priv) {
	424	error = -ENOMEM;
	425	goto fail;
	426	}
	427
03fa68c2	428	ps3_system_bus_set_drvdata(_dev, priv);
c6131fa5 GU	429	spin_lock_init(&priv->lock);
	430
	431	dev->bounce_size = BOUNCE_SIZE;
	432	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	433	if (!dev->bounce_buf) {
	434	error = -ENOMEM;
	435	goto fail_free_priv;
	436	}
	437
	438	error = ps3stor_setup(dev, ps3disk_interrupt);
	439	if (error)
	440	goto fail_free_bounce;
	441
	442	ps3disk_identify(dev);
	443
fab1adcf JA	444	queue = blk_mq_init_sq_queue(&priv->tag_set, &ps3disk_mq_ops, 1,
	445	BLK_MQ_F_SHOULD_MERGE);
	446	if (IS_ERR(queue)) {
	447	dev_err(&dev->sbd.core, "%s:%u: blk_mq_init_queue failed\n",
c6131fa5	448	__func__, __LINE__);
fab1adcf	449	error = PTR_ERR(queue);
c6131fa5 GU	450	goto fail_teardown;
	451	}
	452
	453	priv->queue = queue;
	454	queue->queuedata = dev;
	455
086fa5ff	456	blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
c6131fa5 GU	457	blk_queue_segment_boundary(queue, -1UL);
c6131fa5 GU	458	blk_queue_dma_alignment(queue, dev->blk_size-1);
e1defc4f	459	blk_queue_logical_block_size(queue, dev->blk_size);
c6131fa5	460
12c95f13	461	blk_queue_write_cache(queue, true, false);
c6131fa5	462
8a78362c	463	blk_queue_max_segments(queue, -1);
c6131fa5 GU	464	blk_queue_max_segment_size(queue, dev->bounce_size);
	465
	466	gendisk = alloc_disk(PS3DISK_MINORS);
	467	if (!gendisk) {
	468	dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
	469	__LINE__);
	470	error = -ENOMEM;
	471	goto fail_cleanup_queue;
	472	}
	473
	474	priv->gendisk = gendisk;
	475	gendisk->major = ps3disk_major;
	476	gendisk->first_minor = devidx * PS3DISK_MINORS;
	477	gendisk->fops = &ps3disk_fops;
	478	gendisk->queue = queue;
	479	gendisk->private_data = dev;
c6131fa5 GU	480	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
	481	devidx+'a');
	482	priv->blocking_factor = dev->blk_size >> 9;
	483	set_capacity(gendisk,
	484	dev->regions[dev->region_idx].size*priv->blocking_factor);
	485
	486	dev_info(&dev->sbd.core,
72deb455	487	"%s is a %s (%llu MiB total, %llu MiB for OtherOS)\n",
c6131fa5 GU	488	gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
	489	get_capacity(gendisk) >> 11);
	490
fef912bf	491	device_add_disk(&dev->sbd.core, gendisk, NULL);
c6131fa5 GU	492	return 0;
	493
	494	fail_cleanup_queue:
	495	blk_cleanup_queue(queue);
fab1adcf	496	blk_mq_free_tag_set(&priv->tag_set);
c6131fa5 GU	497	fail_teardown:
	498	ps3stor_teardown(dev);
	499	fail_free_bounce:
	500	kfree(dev->bounce_buf);
	501	fail_free_priv:
	502	kfree(priv);
03fa68c2	503	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	504	fail:
	505	mutex_lock(&ps3disk_mask_mutex);
	506	__clear_bit(devidx, &ps3disk_mask);
	507	mutex_unlock(&ps3disk_mask_mutex);
	508	return error;
	509	}
	510
	511	static int ps3disk_remove(struct ps3_system_bus_device *_dev)
	512	{
	513	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
03fa68c2	514	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	515
c6131fa5 GU	516	mutex_lock(&ps3disk_mask_mutex);
f331c029	517	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
c6131fa5 GU	518	&ps3disk_mask);
	519	mutex_unlock(&ps3disk_mask_mutex);
	520	del_gendisk(priv->gendisk);
	521	blk_cleanup_queue(priv->queue);
fab1adcf	522	blk_mq_free_tag_set(&priv->tag_set);
c6131fa5 GU	523	put_disk(priv->gendisk);
	524	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
	525	ps3disk_sync_cache(dev);
	526	ps3stor_teardown(dev);
	527	kfree(dev->bounce_buf);
	528	kfree(priv);
03fa68c2	529	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	530	return 0;
	531	}
	532
	533	static struct ps3_system_bus_driver ps3disk = {
	534	.match_id = PS3_MATCH_ID_STOR_DISK,
	535	.core.name = DEVICE_NAME,
	536	.core.owner = THIS_MODULE,
	537	.probe = ps3disk_probe,
	538	.remove = ps3disk_remove,
	539	.shutdown = ps3disk_remove,
	540	};
	541
	542
	543	static int __init ps3disk_init(void)
	544	{
	545	int error;
	546
	547	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
	548	return -ENODEV;
	549
	550	error = register_blkdev(0, DEVICE_NAME);
	551	if (error <= 0) {
	552	printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
	553	__LINE__, error);
	554	return error;
	555	}
	556	ps3disk_major = error;
	557
	558	pr_info("%s:%u: registered block device major %d\n", __func__,
	559	__LINE__, ps3disk_major);
	560
	561	error = ps3_system_bus_driver_register(&ps3disk);
	562	if (error)
	563	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	564
	565	return error;
	566	}
	567
	568	static void __exit ps3disk_exit(void)
	569	{
	570	ps3_system_bus_driver_unregister(&ps3disk);
	571	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	572	}
	573
	574	module_init(ps3disk_init);
	575	module_exit(ps3disk_exit);
	576
	577	MODULE_LICENSE("GPL");
	578	MODULE_DESCRIPTION("PS3 Disk Storage Driver");
	579	MODULE_AUTHOR("Sony Corporation");
	580	MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);