diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-04 21:01:27 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-04 21:01:27 -0800 |
commit | ccf21b69a83afaee4d5499e0d03eacf23946e08c (patch) | |
tree | 9831589f82e8d5a47eac253f54f4121e62e4c5a6 /drivers/nvme | |
parent | 527d1529e38b36fd22e65711b653ab773179d9e8 (diff) | |
parent | 73fcf4e20ebd19468b3ad033be93582258435462 (diff) |
Merge branch 'for-4.4/reservations' of git://git.kernel.dk/linux-block
Pull block reservation support from Jens Axboe:
"This adds support for persistent reservations, both at the core level,
as well as for sd and NVMe"
[ Background from the docs: "Persistent Reservations allow restricting
access to block devices to specific initiators in a shared storage
setup. All implementations are expected to ensure the reservations
survive a power loss and cover all connections in a multi path
environment" ]
* 'for-4.4/reservations' of git://git.kernel.dk/linux-block:
NVMe: Precedence error in nvme_pr_clear()
nvme: add missing endianess annotations in nvme_pr_command
NVMe: Add persistent reservation ops
sd: implement the Persistent Reservation API
block: add an API for Persistent Reservations
block: cleanup blkdev_ioctl
Diffstat (limited to 'drivers/nvme')
-rw-r--r-- | drivers/nvme/host/pci.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 381d2a0aa461..e878590e71b6 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -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" @@ -2064,6 +2066,98 @@ 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 = cpu_to_le32(ns->ns_id); + c.common.cdw10[0] = cpu_to_le32(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, @@ -2072,6 +2166,7 @@ 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) |