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

// SPDX-License-Identifier: GPL-2.0
#include <linux/vmalloc.h>
#include "null_blk.h"

/* zone_size in MBs to sectors. */
#define ZONE_SIZE_SHIFT		11

static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
{
	return sect >> ilog2(dev->zone_size_sects);
}

int null_zone_init(struct nullb_device *dev)
{
	sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
	sector_t sector = 0;
	unsigned int i;

	if (!is_power_of_2(dev->zone_size)) {
		pr_err("null_blk: zone_size must be power-of-two\n");
		return -EINVAL;
	}

	dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
	dev->nr_zones = dev_size >>
				(SECTOR_SHIFT + ilog2(dev->zone_size_sects));
	dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
			GFP_KERNEL | __GFP_ZERO);
	if (!dev->zones)
		return -ENOMEM;

	for (i = 0; i < dev->nr_zones; i++) {
		struct blk_zone *zone = &dev->zones[i];

		zone->start = zone->wp = sector;
		zone->len = dev->zone_size_sects;
		zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
		zone->cond = BLK_ZONE_COND_EMPTY;

		sector += dev->zone_size_sects;
	}

	return 0;
}

void null_zone_exit(struct nullb_device *dev)
{
	kvfree(dev->zones);
}

int null_zone_report(struct gendisk *disk, sector_t sector,
		     struct blk_zone *zones, unsigned int *nr_zones,
		     gfp_t gfp_mask)
{
	struct nullb *nullb = disk->private_data;
	struct nullb_device *dev = nullb->dev;
	unsigned int zno, nrz = 0;

	if (!dev->zoned)
		/* Not a zoned null device */
		return -EOPNOTSUPP;

	zno = null_zone_no(dev, sector);
	if (zno < dev->nr_zones) {
		nrz = min_t(unsigned int, *nr_zones, dev->nr_zones - zno);
		memcpy(zones, &dev->zones[zno], nrz * sizeof(struct blk_zone));
	}

	*nr_zones = nrz;

	return 0;
}

void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
		     unsigned int nr_sectors)
{
	struct nullb_device *dev = cmd->nq->dev;
	unsigned int zno = null_zone_no(dev, sector);
	struct blk_zone *zone = &dev->zones[zno];

	switch (zone->cond) {
	case BLK_ZONE_COND_FULL:
		/* Cannot write to a full zone */
		cmd->error = BLK_STS_IOERR;
		break;
	case BLK_ZONE_COND_EMPTY:
	case BLK_ZONE_COND_IMP_OPEN:
		/* Writes must be at the write pointer position */
		if (sector != zone->wp) {
			cmd->error = BLK_STS_IOERR;
			break;
		}

		if (zone->cond == BLK_ZONE_COND_EMPTY)
			zone->cond = BLK_ZONE_COND_IMP_OPEN;

		zone->wp += nr_sectors;
		if (zone->wp == zone->start + zone->len)
			zone->cond = BLK_ZONE_COND_FULL;
		break;
	default:
		/* Invalid zone condition */
		cmd->error = BLK_STS_IOERR;
		break;
	}
}

void null_zone_reset(struct nullb_cmd *cmd, sector_t sector)
{
	struct nullb_device *dev = cmd->nq->dev;
	unsigned int zno = null_zone_no(dev, sector);
	struct blk_zone *zone = &dev->zones[zno];

	zone->cond = BLK_ZONE_COND_EMPTY;
	zone->wp = zone->start;
}
Commit	Line	Data
ca4b2a01 MB	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/vmalloc.h>
	3	#include "null_blk.h"
	4
	5	/* zone_size in MBs to sectors. */
	6	#define ZONE_SIZE_SHIFT 11
	7
	8	static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
	9	{
	10	return sect >> ilog2(dev->zone_size_sects);
	11	}
	12
	13	int null_zone_init(struct nullb_device *dev)
	14	{
	15	sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
	16	sector_t sector = 0;
	17	unsigned int i;
	18
	19	if (!is_power_of_2(dev->zone_size)) {
	20	pr_err("null_blk: zone_size must be power-of-two\n");
	21	return -EINVAL;
	22	}
	23
	24	dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
	25	dev->nr_zones = dev_size >>
	26	(SECTOR_SHIFT + ilog2(dev->zone_size_sects));
	27	dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
	28	GFP_KERNEL \| __GFP_ZERO);
	29	if (!dev->zones)
	30	return -ENOMEM;
	31
	32	for (i = 0; i < dev->nr_zones; i++) {
	33	struct blk_zone *zone = &dev->zones[i];
	34
	35	zone->start = zone->wp = sector;
	36	zone->len = dev->zone_size_sects;
	37	zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
	38	zone->cond = BLK_ZONE_COND_EMPTY;
	39
	40	sector += dev->zone_size_sects;
	41	}
	42
	43	return 0;
	44	}
	45
	46	void null_zone_exit(struct nullb_device *dev)
	47	{
	48	kvfree(dev->zones);
	49	}
	50
e76239a3 CH	51	int null_zone_report(struct gendisk *disk, sector_t sector,
	52	struct blk_zone zones, unsigned int nr_zones,
	53	gfp_t gfp_mask)
ca4b2a01	54	{
e76239a3 CH	55	struct nullb *nullb = disk->private_data;
	56	struct nullb_device *dev = nullb->dev;
	57	unsigned int zno, nrz = 0;
ca4b2a01	58
e76239a3 CH	59	if (!dev->zoned)
	60	/* Not a zoned null device */
	61	return -EOPNOTSUPP;
ca4b2a01	62
e76239a3 CH	63	zno = null_zone_no(dev, sector);
	64	if (zno < dev->nr_zones) {
	65	nrz = min_t(unsigned int, *nr_zones, dev->nr_zones - zno);
	66	memcpy(zones, &dev->zones[zno], nrz * sizeof(struct blk_zone));
ca4b2a01	67	}
ca4b2a01	68
e76239a3	69	*nr_zones = nrz;
ca4b2a01	70
e76239a3	71	return 0;
ca4b2a01 MB	72	}
ca4b2a01 MB	73
b228ba1c JA	74	void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
b228ba1c JA	75	unsigned int nr_sectors)
ca4b2a01 MB	76	{
ca4b2a01 MB	77	struct nullb_device *dev = cmd->nq->dev;
ca4b2a01 MB	78	unsigned int zno = null_zone_no(dev, sector);
	79	struct blk_zone *zone = &dev->zones[zno];
	80
	81	switch (zone->cond) {
	82	case BLK_ZONE_COND_FULL:
	83	/* Cannot write to a full zone */
	84	cmd->error = BLK_STS_IOERR;
	85	break;
	86	case BLK_ZONE_COND_EMPTY:
	87	case BLK_ZONE_COND_IMP_OPEN:
	88	/* Writes must be at the write pointer position */
b228ba1c	89	if (sector != zone->wp) {
ca4b2a01 MB	90	cmd->error = BLK_STS_IOERR;
	91	break;
	92	}
	93
	94	if (zone->cond == BLK_ZONE_COND_EMPTY)
	95	zone->cond = BLK_ZONE_COND_IMP_OPEN;
	96
b228ba1c	97	zone->wp += nr_sectors;
ca4b2a01 MB	98	if (zone->wp == zone->start + zone->len)
	99	zone->cond = BLK_ZONE_COND_FULL;
	100	break;
	101	default:
	102	/* Invalid zone condition */
	103	cmd->error = BLK_STS_IOERR;
	104	break;
	105	}
	106	}
	107
b228ba1c	108	void null_zone_reset(struct nullb_cmd *cmd, sector_t sector)
ca4b2a01 MB	109	{
ca4b2a01 MB	110	struct nullb_device *dev = cmd->nq->dev;
b228ba1c	111	unsigned int zno = null_zone_no(dev, sector);
ca4b2a01 MB	112	struct blk_zone *zone = &dev->zones[zno];
	113
	114	zone->cond = BLK_ZONE_COND_EMPTY;
	115	zone->wp = zone->start;
	116	}