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Commit 1d277a63 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

NVMe: Add persistent reservation ops 



Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
[hch: rebased, set PTPL=1]
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 924d55b0

drivers/nvme/host/pci.c

+95 −0
Original line number Diff line number Diff line
@@ -39,8 +39,10 @@ 
#include <linux/slab.h>

#include <linux/t10-pi.h>

#include <linux/types.h>

#include <linux/pr.h>

#include <scsi/sg.h>

#include <asm-generic/io-64-nonatomic-lo-hi.h>

#include <asm/unaligned.h>



#include <uapi/linux/nvme_ioctl.h>

#include "nvme.h"
@@ -2060,6 +2062,98 @@ static int nvme_revalidate_disk(struct gendisk *disk) 
	return 0;

}



static char nvme_pr_type(enum pr_type type)

{

	switch (type) {

	case PR_WRITE_EXCLUSIVE:

		return 1;

	case PR_EXCLUSIVE_ACCESS:

		return 2;

	case PR_WRITE_EXCLUSIVE_REG_ONLY:

		return 3;

	case PR_EXCLUSIVE_ACCESS_REG_ONLY:

		return 4;

	case PR_WRITE_EXCLUSIVE_ALL_REGS:

		return 5;

	case PR_EXCLUSIVE_ACCESS_ALL_REGS:

		return 6;

	default:

		return 0;

	}

};



static int nvme_pr_command(struct block_device *bdev, u32 cdw10,

				u64 key, u64 sa_key, u8 op)

{

	struct nvme_ns *ns = bdev->bd_disk->private_data;

	struct nvme_command c;

	u8 data[16] = { 0, };



	put_unaligned_le64(key, &data[0]);

	put_unaligned_le64(sa_key, &data[8]);



	memset(&c, 0, sizeof(c));

	c.common.opcode = op;

	c.common.nsid = ns->ns_id;

	c.common.cdw10[0] = cdw10;



	return nvme_submit_sync_cmd(ns->queue, &c, data, 16);

}



static int nvme_pr_register(struct block_device *bdev, u64 old,

		u64 new, unsigned flags)

{

	u32 cdw10;



	if (flags & ~PR_FL_IGNORE_KEY)

		return -EOPNOTSUPP;



	cdw10 = old ? 2 : 0;

	cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;

	cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */

	return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);

}



static int nvme_pr_reserve(struct block_device *bdev, u64 key,

		enum pr_type type, unsigned flags)

{

	u32 cdw10;



	if (flags & ~PR_FL_IGNORE_KEY)

		return -EOPNOTSUPP;



	cdw10 = nvme_pr_type(type) << 8;

	cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);

	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);

}



static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,

		enum pr_type type, bool abort)

{

	u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;

	return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);

}



static int nvme_pr_clear(struct block_device *bdev, u64 key)

{

	u32 cdw10 = 1 | key ? 1 << 3 : 0;

	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);

}



static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)

{

	u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;

	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);

}



static const struct pr_ops nvme_pr_ops = {

	.pr_register	= nvme_pr_register,

	.pr_reserve	= nvme_pr_reserve,

	.pr_release	= nvme_pr_release,

	.pr_preempt	= nvme_pr_preempt,

	.pr_clear	= nvme_pr_clear,

};



static const struct block_device_operations nvme_fops = {

	.owner		= THIS_MODULE,

	.ioctl		= nvme_ioctl,
@@ -2068,6 +2162,7 @@ static const struct block_device_operations nvme_fops = { 
	.release	= nvme_release,

	.getgeo		= nvme_getgeo,

	.revalidate_disk= nvme_revalidate_disk,

	.pr_ops		= &nvme_pr_ops,

};



static int nvme_kthread(void *data)