From 28c97ba38ff9c00bc177887c2d8568b7115a44e0 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Fri, 7 Apr 2023 15:05:46 -0500 Subject: nvme: Add pr_ops read_reservation support 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 Link: https://lore.kernel.org/r/20230407200551.12660-14-michael.christie@oracle.com Reviewed-by: Chaitanya Kulkarni Reviewed-by: Christoph Hellwig Signed-off-by: Martin K. Petersen --- drivers/nvme/host/pr.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/drivers/nvme/host/pr.c b/drivers/nvme/host/pr.c index 732c56b417c2..391b1465ebfd 100644 --- a/drivers/nvme/host/pr.c +++ b/drivers/nvme/host/pr.c @@ -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 @@ free_rse: 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, }; -- cgit v1.2.3