drivers/block/ps3disk.c - pub/scm/linux/kernel/git/mdf/linux-fpga - Git at Google

 // 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 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, 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_max_hw_sectors(queue, dev->bounce_size >> 9);
 	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);

 	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:
 	blk_cleanup_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);
 	blk_cleanup_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);
	// 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 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, 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_max_hw_sectors(queue, dev->bounce_size >> 9);
	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);

	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:
	blk_cleanup_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);
	blk_cleanup_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);