[thirdparty/linux.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 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;

	rq_for_each_segment(bvec, req, iter) {
		if (gather)
			memcpy_from_bvec(dev->bounce_buf + offset, &bvec);
		else
			memcpy_to_bvec(&bvec, dev->bounce_buf + offset);
	}
}

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->gendisk->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 queue_limits lim = {
		.logical_block_size	= dev->blk_size,
		.max_hw_sectors		= dev->bounce_size >> 9,
		.max_segments		= -1,
		.max_segment_size	= dev->bounce_size,
		.dma_alignment		= dev->blk_size - 1,
	};

	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);

	error = blk_mq_alloc_sq_tag_set(&priv->tag_set, &ps3disk_mq_ops, 1,
					BLK_MQ_F_SHOULD_MERGE);
	if (error)
		goto fail_teardown;

	gendisk = blk_mq_alloc_disk(&priv->tag_set, &lim, dev);
	if (IS_ERR(gendisk)) {
		dev_err(&dev->sbd.core, "%s:%u: blk_mq_alloc_disk failed\n",
			__func__, __LINE__);
		error = PTR_ERR(gendisk);
		goto fail_free_tag_set;
	}

	queue = gendisk->queue;

	blk_queue_write_cache(queue, true, false);

	priv->gendisk = gendisk;
	gendisk->major = ps3disk_major;
	gendisk->first_minor = devidx * PS3DISK_MINORS;
	gendisk->minors = PS3DISK_MINORS;
	gendisk->fops = &ps3disk_fops;
	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);

	error = device_add_disk(&dev->sbd.core, gendisk, NULL);
	if (error)
		goto fail_cleanup_disk;

	return 0;
fail_cleanup_disk:
	put_disk(gendisk);
fail_free_tag_set:
	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 void 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);
	put_disk(priv->gendisk);
	blk_mq_free_tag_set(&priv->tag_set);
	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);
}

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 */
fab1adcf	32	struct blk_mq_tag_set tag_set;
c6131fa5 GU	33	struct gendisk *gendisk;
	34	unsigned int blocking_factor;
	35	struct request *req;
	36	u64 raw_capacity;
	37	unsigned char model[ATA_ID_PROD_LEN+1];
	38	};
	39
	40
	41	#define LV1_STORAGE_SEND_ATA_COMMAND (2)
	42	#define LV1_STORAGE_ATA_HDDOUT (0x23)
	43
	44	struct lv1_ata_cmnd_block {
	45	u16 features;
	46	u16 sector_count;
	47	u16 LBA_low;
	48	u16 LBA_mid;
	49	u16 LBA_high;
	50	u8 device;
	51	u8 command;
	52	u32 is_ext;
	53	u32 proto;
	54	u32 in_out;
	55	u32 size;
	56	u64 buffer;
	57	u32 arglen;
	58	};
	59
	60	enum lv1_ata_proto {
	61	NON_DATA_PROTO = 0,
	62	PIO_DATA_IN_PROTO = 1,
	63	PIO_DATA_OUT_PROTO = 2,
	64	DMA_PROTO = 3
	65	};
	66
	67	enum lv1_ata_in_out {
	68	DIR_WRITE = 0, /* memory -> device */
	69	DIR_READ = 1 /* device -> memory */
	70	};
	71
	72	static int ps3disk_major;
	73
	74
83d5cde4	75	static const struct block_device_operations ps3disk_fops = {
c6131fa5 GU	76	.owner = THIS_MODULE,
	77	};
	78
	79
	80	static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
	81	struct request *req, int gather)
	82	{
	83	unsigned int offset = 0;
5705f702	84	struct req_iterator iter;
7988613b	85	struct bio_vec bvec;
c6131fa5	86
5705f702	87	rq_for_each_segment(bvec, req, iter) {
6c92e699	88	if (gather)
6e0a4855	89	memcpy_from_bvec(dev->bounce_buf + offset, &bvec);
6c92e699	90	else
6e0a4855	91	memcpy_to_bvec(&bvec, dev->bounce_buf + offset);
c6131fa5 GU	92	}
	93	}
	94
fab1adcf JA	95	static blk_status_t ps3disk_submit_request_sg(struct ps3_storage_device *dev,
fab1adcf JA	96	struct request *req)
c6131fa5	97	{
03fa68c2	98	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	99	int write = rq_data_dir(req), res;
	100	const char *op = write ? "write" : "read";
	101	u64 start_sector, sectors;
	102	unsigned int region_id = dev->regions[dev->region_idx].id;
	103
	104	#ifdef DEBUG
	105	unsigned int n = 0;
7988613b	106	struct bio_vec bv;
5705f702	107	struct req_iterator iter;
c6131fa5	108
5705f702	109	rq_for_each_segment(bv, req, iter)
c6131fa5 GU	110	n++;
c6131fa5 GU	111	dev_dbg(&dev->sbd.core,
83096ebf TH	112	"%s:%u: %s req has %u bvecs for %u sectors\n",
83096ebf TH	113	__func__, __LINE__, op, n, blk_rq_sectors(req));
c6131fa5 GU	114	#endif
c6131fa5 GU	115
83096ebf TH	116	start_sector = blk_rq_pos(req) * priv->blocking_factor;
83096ebf TH	117	sectors = blk_rq_sectors(req) * priv->blocking_factor;
e377c6e2	118	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
c6131fa5 GU	119	__func__, __LINE__, op, sectors, start_sector);
	120
	121	if (write) {
	122	ps3disk_scatter_gather(dev, req, 1);
	123
	124	res = lv1_storage_write(dev->sbd.dev_id, region_id,
	125	start_sector, sectors, 0,
	126	dev->bounce_lpar, &dev->tag);
	127	} else {
	128	res = lv1_storage_read(dev->sbd.dev_id, region_id,
	129	start_sector, sectors, 0,
	130	dev->bounce_lpar, &dev->tag);
	131	}
	132	if (res) {
	133	dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
	134	__LINE__, op, res);
fab1adcf	135	return BLK_STS_IOERR;
c6131fa5 GU	136	}
	137
	138	priv->req = req;
fab1adcf	139	return BLK_STS_OK;
c6131fa5 GU	140	}
c6131fa5 GU	141
fab1adcf JA	142	static blk_status_t ps3disk_submit_flush_request(struct ps3_storage_device *dev,
fab1adcf JA	143	struct request *req)
c6131fa5	144	{
03fa68c2	145	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	146	u64 res;
	147
	148	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
	149
	150	res = lv1_storage_send_device_command(dev->sbd.dev_id,
	151	LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
	152	0, &dev->tag);
	153	if (res) {
e377c6e2	154	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5	155	__func__, __LINE__, res);
fab1adcf	156	return BLK_STS_IOERR;
c6131fa5 GU	157	}
	158
	159	priv->req = req;
fab1adcf	160	return BLK_STS_OK;
c6131fa5 GU	161	}
c6131fa5 GU	162
fab1adcf JA	163	static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev,
fab1adcf JA	164	struct request *req)
c6131fa5	165	{
c6131fa5 GU	166	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
c6131fa5 GU	167
fab1adcf JA	168	switch (req_op(req)) {
	169	case REQ_OP_FLUSH:
	170	return ps3disk_submit_flush_request(dev, req);
	171	case REQ_OP_READ:
	172	case REQ_OP_WRITE:
	173	return ps3disk_submit_request_sg(dev, req);
	174	default:
	175	blk_dump_rq_flags(req, DEVICE_NAME " bad request");
	176	return BLK_STS_IOERR;
c6131fa5 GU	177	}
	178	}
	179
fab1adcf JA	180	static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx,
fab1adcf JA	181	const struct blk_mq_queue_data *bd)
c6131fa5	182	{
fab1adcf	183	struct request_queue *q = hctx->queue;
c6131fa5	184	struct ps3_storage_device *dev = q->queuedata;
03fa68c2	185	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
fab1adcf	186	blk_status_t ret;
c6131fa5	187
fab1adcf JA	188	blk_mq_start_request(bd->rq);
	189
	190	spin_lock_irq(&priv->lock);
	191	ret = ps3disk_do_request(dev, bd->rq);
	192	spin_unlock_irq(&priv->lock);
c6131fa5	193
fab1adcf	194	return ret;
c6131fa5 GU	195	}
	196
	197	static irqreturn_t ps3disk_interrupt(int irq, void *data)
	198	{
	199	struct ps3_storage_device *dev = data;
	200	struct ps3disk_private *priv;
	201	struct request *req;
2a842aca CH	202	int res, read;
2a842aca CH	203	blk_status_t error;
c6131fa5	204	u64 tag, status;
c6131fa5 GU	205	const char *op;
	206
	207	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
	208
	209	if (tag != dev->tag)
	210	dev_err(&dev->sbd.core,
e377c6e2	211	"%s:%u: tag mismatch, got %llx, expected %llx\n",
c6131fa5 GU	212	__func__, __LINE__, tag, dev->tag);
	213
	214	if (res) {
e377c6e2	215	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
c6131fa5 GU	216	__func__, __LINE__, res, status);
	217	return IRQ_HANDLED;
	218	}
	219
03fa68c2	220	priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	221	req = priv->req;
	222	if (!req) {
	223	dev_dbg(&dev->sbd.core,
	224	"%s:%u non-block layer request completed\n", __func__,
	225	__LINE__);
	226	dev->lv1_status = status;
	227	complete(&dev->done);
	228	return IRQ_HANDLED;
	229	}
	230
3a5e02ce	231	if (req_op(req) == REQ_OP_FLUSH) {
c6131fa5	232	read = 0;
c6131fa5 GU	233	op = "flush";
	234	} else {
	235	read = !rq_data_dir(req);
c6131fa5 GU	236	op = read ? "read" : "write";
	237	}
	238	if (status) {
e377c6e2	239	dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
c6131fa5	240	__LINE__, op, status);
2a842aca	241	error = BLK_STS_IOERR;
c6131fa5 GU	242	} else {
	243	dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
	244	__LINE__, op);
f01ab252	245	error = 0;
c6131fa5 GU	246	if (read)
	247	ps3disk_scatter_gather(dev, req, 0);
	248	}
	249
	250	spin_lock(&priv->lock);
c6131fa5	251	priv->req = NULL;
fab1adcf	252	blk_mq_end_request(req, error);
c6131fa5 GU	253	spin_unlock(&priv->lock);
c6131fa5 GU	254
89662ac5	255	blk_mq_run_hw_queues(priv->gendisk->queue, true);
c6131fa5 GU	256	return IRQ_HANDLED;
	257	}
	258
	259	static int ps3disk_sync_cache(struct ps3_storage_device *dev)
	260	{
	261	u64 res;
	262
	263	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
	264
	265	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
	266	if (res) {
e377c6e2	267	dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
c6131fa5 GU	268	__func__, __LINE__, res);
	269	return -EIO;
	270	}
	271	return 0;
	272	}
	273
	274
	275	/* ATA helpers copied from drivers/ata/libata-core.c */
	276
	277	static void swap_buf_le16(u16 *buf, unsigned int buf_words)
	278	{
	279	#ifdef __BIG_ENDIAN
	280	unsigned int i;
	281
	282	for (i = 0; i < buf_words; i++)
	283	buf[i] = le16_to_cpu(buf[i]);
	284	#endif /* __BIG_ENDIAN */
	285	}
	286
	287	static u64 ata_id_n_sectors(const u16 *id)
	288	{
	289	if (ata_id_has_lba(id)) {
	290	if (ata_id_has_lba48(id))
	291	return ata_id_u64(id, 100);
	292	else
	293	return ata_id_u32(id, 60);
	294	} else {
	295	if (ata_id_current_chs_valid(id))
	296	return ata_id_u32(id, 57);
	297	else
	298	return id[1] * id[3] * id[6];
	299	}
	300	}
	301
	302	static void ata_id_string(const u16 id, unsigned char s, unsigned int ofs,
	303	unsigned int len)
	304	{
	305	unsigned int c;
	306
	307	while (len > 0) {
	308	c = id[ofs] >> 8;
	309	*s = c;
	310	s++;
	311
	312	c = id[ofs] & 0xff;
	313	*s = c;
	314	s++;
	315
	316	ofs++;
	317	len -= 2;
	318	}
	319	}
	320
	321	static void ata_id_c_string(const u16 id, unsigned char s, unsigned int ofs,
	322	unsigned int len)
	323	{
	324	unsigned char *p;
	325
	326	WARN_ON(!(len & 1));
	327
	328	ata_id_string(id, s, ofs, len - 1);
	329
	330	p = s + strnlen(s, len - 1);
	331	while (p > s && p[-1] == ' ')
332	p--;
333	*p = '\0';
334	}
335
336	static int ps3disk_identify(struct ps3_storage_device *dev)
337	{
03fa68c2	338	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	339	struct lv1_ata_cmnd_block ata_cmnd;
	340	u16 *id = dev->bounce_buf;
	341	u64 res;
	342
	343	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
	344
	345	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
	346	ata_cmnd.command = ATA_CMD_ID_ATA;
	347	ata_cmnd.sector_count = 1;
	348	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
	349	ata_cmnd.buffer = dev->bounce_lpar;
	350	ata_cmnd.proto = PIO_DATA_IN_PROTO;
	351	ata_cmnd.in_out = DIR_READ;
	352
	353	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
	354	ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
	355	sizeof(ata_cmnd), ata_cmnd.buffer,
	356	ata_cmnd.arglen);
	357	if (res) {
e377c6e2	358	dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
c6131fa5 GU	359	__func__, __LINE__, res);
	360	return -EIO;
	361	}
	362
	363	swap_buf_le16(id, ATA_ID_WORDS);
	364
	365	/* All we're interested in are raw capacity and model name */
	366	priv->raw_capacity = ata_id_n_sectors(id);
	367	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
	368	return 0;
	369	}
	370
c6131fa5 GU	371	static unsigned long ps3disk_mask;
	372
	373	static DEFINE_MUTEX(ps3disk_mask_mutex);
	374
fab1adcf JA	375	static const struct blk_mq_ops ps3disk_mq_ops = {
	376	.queue_rq = ps3disk_queue_rq,
	377	};
	378
8d85fce7	379	static int ps3disk_probe(struct ps3_system_bus_device *_dev)
c6131fa5 GU	380	{
	381	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	382	struct ps3disk_private *priv;
	383	int error;
	384	unsigned int devidx;
a7f18b74 CH	385	struct queue_limits lim = {
	386	.logical_block_size = dev->blk_size,
	387	.max_hw_sectors = dev->bounce_size >> 9,
	388	.max_segments = -1,
	389	.max_segment_size = dev->bounce_size,
	390	.dma_alignment = dev->blk_size - 1,
	391	};
	392
c6131fa5 GU	393	struct request_queue *queue;
	394	struct gendisk *gendisk;
	395
	396	if (dev->blk_size < 512) {
	397	dev_err(&dev->sbd.core,
e377c6e2	398	"%s:%u: cannot handle block size %llu\n", __func__,
c6131fa5 GU	399	__LINE__, dev->blk_size);
	400	return -EINVAL;
	401	}
	402
	403	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
	404	mutex_lock(&ps3disk_mask_mutex);
	405	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
	406	if (devidx >= PS3DISK_MAX_DISKS) {
	407	dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
	408	__LINE__);
	409	mutex_unlock(&ps3disk_mask_mutex);
	410	return -ENOSPC;
	411	}
	412	__set_bit(devidx, &ps3disk_mask);
	413	mutex_unlock(&ps3disk_mask_mutex);
	414
	415	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	416	if (!priv) {
	417	error = -ENOMEM;
	418	goto fail;
	419	}
	420
03fa68c2	421	ps3_system_bus_set_drvdata(_dev, priv);
c6131fa5 GU	422	spin_lock_init(&priv->lock);
	423
	424	dev->bounce_size = BOUNCE_SIZE;
	425	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	426	if (!dev->bounce_buf) {
	427	error = -ENOMEM;
	428	goto fail_free_priv;
	429	}
	430
	431	error = ps3stor_setup(dev, ps3disk_interrupt);
	432	if (error)
	433	goto fail_free_bounce;
	434
	435	ps3disk_identify(dev);
	436
89662ac5	437	error = blk_mq_alloc_sq_tag_set(&priv->tag_set, &ps3disk_mq_ops, 1,
fab1adcf	438	BLK_MQ_F_SHOULD_MERGE);
89662ac5	439	if (error)
c6131fa5	440	goto fail_teardown;
89662ac5	441
a7f18b74	442	gendisk = blk_mq_alloc_disk(&priv->tag_set, &lim, dev);
89662ac5 CH	443	if (IS_ERR(gendisk)) {
	444	dev_err(&dev->sbd.core, "%s:%u: blk_mq_alloc_disk failed\n",
	445	__func__, __LINE__);
	446	error = PTR_ERR(gendisk);
	447	goto fail_free_tag_set;
c6131fa5 GU	448	}
c6131fa5 GU	449
89662ac5	450	queue = gendisk->queue;
c6131fa5	451
12c95f13	452	blk_queue_write_cache(queue, true, false);
c6131fa5	453
c6131fa5 GU	454	priv->gendisk = gendisk;
	455	gendisk->major = ps3disk_major;
	456	gendisk->first_minor = devidx * PS3DISK_MINORS;
89662ac5	457	gendisk->minors = PS3DISK_MINORS;
c6131fa5	458	gendisk->fops = &ps3disk_fops;
c6131fa5	459	gendisk->private_data = dev;
c6131fa5 GU	460	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
	461	devidx+'a');
	462	priv->blocking_factor = dev->blk_size >> 9;
	463	set_capacity(gendisk,
	464	dev->regions[dev->region_idx].size*priv->blocking_factor);
	465
	466	dev_info(&dev->sbd.core,
72deb455	467	"%s is a %s (%llu MiB total, %llu MiB for OtherOS)\n",
c6131fa5 GU	468	gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
	469	get_capacity(gendisk) >> 11);
	470
ff4cbe0f LC	471	error = device_add_disk(&dev->sbd.core, gendisk, NULL);
	472	if (error)
	473	goto fail_cleanup_disk;
c6131fa5	474
ff4cbe0f LC	475	return 0;
ff4cbe0f LC	476	fail_cleanup_disk:
8b9ab626	477	put_disk(gendisk);
89662ac5	478	fail_free_tag_set:
fab1adcf	479	blk_mq_free_tag_set(&priv->tag_set);
c6131fa5 GU	480	fail_teardown:
	481	ps3stor_teardown(dev);
	482	fail_free_bounce:
	483	kfree(dev->bounce_buf);
	484	fail_free_priv:
	485	kfree(priv);
03fa68c2	486	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	487	fail:
	488	mutex_lock(&ps3disk_mask_mutex);
	489	__clear_bit(devidx, &ps3disk_mask);
	490	mutex_unlock(&ps3disk_mask_mutex);
	491	return error;
	492	}
	493
6d247e4d	494	static void ps3disk_remove(struct ps3_system_bus_device *_dev)
c6131fa5 GU	495	{
c6131fa5 GU	496	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
03fa68c2	497	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
c6131fa5 GU	498
c6131fa5 GU	499	mutex_lock(&ps3disk_mask_mutex);
f331c029	500	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
c6131fa5 GU	501	&ps3disk_mask);
	502	mutex_unlock(&ps3disk_mask_mutex);
	503	del_gendisk(priv->gendisk);
8b9ab626	504	put_disk(priv->gendisk);
fab1adcf	505	blk_mq_free_tag_set(&priv->tag_set);
c6131fa5 GU	506	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
	507	ps3disk_sync_cache(dev);
	508	ps3stor_teardown(dev);
	509	kfree(dev->bounce_buf);
	510	kfree(priv);
03fa68c2	511	ps3_system_bus_set_drvdata(_dev, NULL);
c6131fa5 GU	512	}
	513
	514	static struct ps3_system_bus_driver ps3disk = {
	515	.match_id = PS3_MATCH_ID_STOR_DISK,
	516	.core.name = DEVICE_NAME,
	517	.core.owner = THIS_MODULE,
	518	.probe = ps3disk_probe,
	519	.remove = ps3disk_remove,
	520	.shutdown = ps3disk_remove,
	521	};
	522
	523
	524	static int __init ps3disk_init(void)
	525	{
	526	int error;
	527
	528	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
	529	return -ENODEV;
	530
	531	error = register_blkdev(0, DEVICE_NAME);
	532	if (error <= 0) {
	533	printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
	534	__LINE__, error);
	535	return error;
	536	}
	537	ps3disk_major = error;
	538
	539	pr_info("%s:%u: registered block device major %d\n", __func__,
	540	__LINE__, ps3disk_major);
	541
	542	error = ps3_system_bus_driver_register(&ps3disk);
	543	if (error)
	544	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	545
	546	return error;
	547	}
	548
	549	static void __exit ps3disk_exit(void)
	550	{
	551	ps3_system_bus_driver_unregister(&ps3disk);
	552	unregister_blkdev(ps3disk_major, DEVICE_NAME);
	553	}
	554
	555	module_init(ps3disk_init);
	556	module_exit(ps3disk_exit);
	557
	558	MODULE_LICENSE("GPL");
	559	MODULE_DESCRIPTION("PS3 Disk Storage Driver");
	560	MODULE_AUTHOR("Sony Corporation");
	561	MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);