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Fri, 24 Feb 2023 17:45:24 +0000 Received: from DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::7dd7:8d22:104:8d64]) by DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::7dd7:8d22:104:8d64%7]) with mapi id 15.20.6156.007; Fri, 24 Feb 2023 17:45:24 +0000 From: Mike Christie To: bvanassche@acm.org, hch@lst.de, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, james.bottomley@hansenpartnership.com, linux-block@vger.kernel.org, dm-devel@redhat.com, snitzer@kernel.org, axboe@kernel.dk, linux-nvme@lists.infradead.org, chaitanyak@nvidia.com, kbusch@kernel.org, target-devel@vger.kernel.org Cc: Mike Christie Subject: [PATCH v4 13/18] nvme: Add pr_ops read_reservation support Date: Fri, 24 Feb 2023 11:44:57 -0600 Message-Id: <20230224174502.321490-14-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230224174502.321490-1-michael.christie@oracle.com> References: <20230224174502.321490-1-michael.christie@oracle.com> X-ClientProxiedBy: DM6PR03CA0025.namprd03.prod.outlook.com (2603:10b6:5:40::38) To DM5PR10MB1466.namprd10.prod.outlook.com (2603:10b6:3:b::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM5PR10MB1466:EE_|CH0PR10MB7535:EE_ X-MS-Office365-Filtering-Correlation-Id: cabcc001-d3f4-48da-3f10-08db168ee818 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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 --- drivers/nvme/host/pr.c | 81 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) diff --git a/drivers/nvme/host/pr.c b/drivers/nvme/host/pr.c index 66086369dbce..cadf61dc60c3 100644 --- a/drivers/nvme/host/pr.c +++ b/drivers/nvme/host/pr.c @@ -26,6 +26,26 @@ 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 NVME_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) { @@ -215,6 +235,66 @@ 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 tmp_rs, *rs; + int ret, i, num_regs; + u32 rs_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_rs, sizeof(tmp_rs), &eds); + if (ret) + return ret; + + num_regs = get_unaligned_le16(&tmp_rs.regctl); + if (!num_regs) { + resv->generation = le32_to_cpu(tmp_rs.gen); + return 0; + } + + rs_len = sizeof(*rs) + + num_regs * sizeof(struct nvme_registered_ctrl_ext); + rs = kzalloc(rs_len, GFP_KERNEL); + if (!rs) + return -ENOMEM; + + ret = nvme_pr_resv_report(bdev, rs, rs_len, &eds); + if (ret) + goto free_rs; + + if (num_regs != get_unaligned_le16(&rs->regctl)) { + kfree(rs); + goto get_num_regs; + } + + resv->generation = le32_to_cpu(rs->gen); + resv->type = block_pr_type_from_nvme(rs->rtype); + + for (i = 0; i < num_regs; i++) { + if (eds) { + if (rs->regctl_eds[i].rcsts) { + resv->key = le64_to_cpu(rs->regctl_eds[i].rkey); + break; + } + } else { + if (rs->regctl_ds[i].rcsts) { + resv->key = le64_to_cpu(rs->regctl_ds[i].rkey); + break; + } + } + } + +free_rs: + kfree(rs); + return ret; +} + const struct pr_ops nvme_pr_ops = { .pr_register = nvme_pr_register, .pr_reserve = nvme_pr_reserve, @@ -222,4 +302,5 @@ 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, };