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nvme: Add pr_ops read_reservation support

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This patch adds support for the pr_ops read_reservation callout by
calling the NVMe Reservation Report helper. It then parses that info to
detect if there is a reservation and if there is then convert the
returned info to a pr_ops pr_held_reservation struct.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230407200551.12660-14-michael.christie@oracle.com
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2023-04-07 15:05:46 -05:00 committed by Martin K. Petersen
parent be1a7cd2d0
commit 28c97ba38f
1 changed files with 83 additions and 0 deletions
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83
drivers/nvme/host/pr.c
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@ -29,6 +29,26 @@ static enum nvme_pr_type nvme_pr_type_from_blk(enum pr_type type)
return 0;
}
static enum pr_type block_pr_type_from_nvme(enum nvme_pr_type type)
{
switch (type) {
case NVME_PR_WRITE_EXCLUSIVE:
return PR_WRITE_EXCLUSIVE;
case NVME_PR_EXCLUSIVE_ACCESS:
return PR_EXCLUSIVE_ACCESS;
case NVME_PR_WRITE_EXCLUSIVE_REG_ONLY:
return PR_WRITE_EXCLUSIVE_REG_ONLY;
case NVME_PR_EXCLUSIVE_ACCESS_REG_ONLY:
return PR_EXCLUSIVE_ACCESS_REG_ONLY;
case NVME_PR_WRITE_EXCLUSIVE_ALL_REGS:
return PR_WRITE_EXCLUSIVE_ALL_REGS;
case NVME_PR_EXCLUSIVE_ACCESS_ALL_REGS:
return PR_EXCLUSIVE_ACCESS_ALL_REGS;
}
return 0;
}
static int nvme_send_ns_head_pr_command(struct block_device *bdev,
struct nvme_command *c, void *data, unsigned int data_len)
{
@ -222,6 +242,68 @@ static int nvme_pr_read_keys(struct block_device *bdev,
return ret;
}
static int nvme_pr_read_reservation(struct block_device *bdev,
struct pr_held_reservation *resv)
{
struct nvme_reservation_status_ext tmp_rse, *rse;
int ret, i, num_regs;
u32 rse_len;
bool eds;
get_num_regs:
/*
* Get the number of registrations so we know how big to allocate
* the response buffer.
*/
ret = nvme_pr_resv_report(bdev, &tmp_rse, sizeof(tmp_rse), &eds);
if (ret)
return ret;
num_regs = get_unaligned_le16(&tmp_rse.regctl);
if (!num_regs) {
resv->generation = le32_to_cpu(tmp_rse.gen);
return 0;
}
rse_len = struct_size(rse, regctl_eds, num_regs);
rse = kzalloc(rse_len, GFP_KERNEL);
if (!rse)
return -ENOMEM;
ret = nvme_pr_resv_report(bdev, rse, rse_len, &eds);
if (ret)
goto free_rse;
if (num_regs != get_unaligned_le16(&rse->regctl)) {
kfree(rse);
goto get_num_regs;
}
resv->generation = le32_to_cpu(rse->gen);
resv->type = block_pr_type_from_nvme(rse->rtype);
for (i = 0; i < num_regs; i++) {
if (eds) {
if (rse->regctl_eds[i].rcsts) {
resv->key = le64_to_cpu(rse->regctl_eds[i].rkey);
break;
}
} else {
struct nvme_reservation_status *rs;
rs = (struct nvme_reservation_status *)rse;
if (rs->regctl_ds[i].rcsts) {
resv->key = le64_to_cpu(rs->regctl_ds[i].rkey);
break;
}
}
}
free_rse:
kfree(rse);
return ret;
}
const struct pr_ops nvme_pr_ops = {
.pr_register = nvme_pr_register,
.pr_reserve = nvme_pr_reserve,
@ -229,4 +311,5 @@ const struct pr_ops nvme_pr_ops = {
.pr_preempt = nvme_pr_preempt,
.pr_clear = nvme_pr_clear,
.pr_read_keys = nvme_pr_read_keys,
.pr_read_reservation = nvme_pr_read_reservation,
};