@@ -118,10 +118,83 @@ static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type
return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
}
+static int nvme_pr_resv_report(struct block_device *bdev, u8 *data,
+ u32 data_len, bool *eds)
+{
+ struct nvme_command c = { };
+ int ret;
+
+ c.common.opcode = nvme_cmd_resv_report;
+ c.common.cdw10 = cpu_to_le32(nvme_bytes_to_numd(data_len));
+ c.common.cdw11 = NVME_EXTENDED_DATA_STRUCT;
+ *eds = true;
+
+retry:
+ if (IS_ENABLED(CONFIG_NVME_MULTIPATH) &&
+ bdev->bd_disk->fops == &nvme_ns_head_ops)
+ ret = nvme_send_ns_head_pr_command(bdev, &c, data, data_len);
+ else
+ ret = nvme_send_ns_pr_command(bdev->bd_disk->private_data, &c,
+ data, data_len);
+ if (ret == NVME_SC_HOST_ID_INCONSIST &&
+ c.common.cdw11 == NVME_EXTENDED_DATA_STRUCT) {
+ c.common.cdw11 = 0;
+ *eds = false;
+ goto retry;
+ }
+
+ return ret;
+}
+
+static int nvme_pr_read_keys(struct block_device *bdev,
+ struct pr_keys *keys_info, u32 keys_len)
+{
+ struct nvme_reservation_status *status;
+ u32 data_len, num_ret_keys;
+ int ret, i;
+ bool eds;
+ u8 *data;
+
+ /*
+ * Assume we are using 128-bit host IDs and allocate a buffer large
+ * enough to get enough keys to fill the return keys buffer.
+ */
+ num_ret_keys = keys_len / 8;
+ data_len = sizeof(*status) +
+ num_ret_keys * sizeof(struct nvme_registered_ctrl_ext);
+ data = kzalloc(data_len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = nvme_pr_resv_report(bdev, data, data_len, &eds);
+ if (ret)
+ goto free_data;
+
+ status = (struct nvme_reservation_status *)data;
+ keys_info->generation = le32_to_cpu(status->gen);
+ keys_info->num_keys = get_unaligned_le16(&status->regctl);
+
+ num_ret_keys = min(num_ret_keys, keys_info->num_keys);
+ for (i = 0; i < num_ret_keys; i++) {
+ if (eds) {
+ keys_info->keys[i] =
+ le64_to_cpu(status->regctl_eds[i].rkey);
+ } else {
+ keys_info->keys[i] =
+ le64_to_cpu(status->regctl_ds[i].rkey);
+ }
+ }
+
+free_data:
+ kfree(data);
+ return ret;
+}
+
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,
+ .pr_read_keys = nvme_pr_read_keys,
};
@@ -757,6 +757,10 @@ enum {
NVME_LBART_ATTRIB_HIDE = 1 << 1,
};
+enum nvme_eds {
+ NVME_EXTENDED_DATA_STRUCT = 0x1,
+};
+
struct nvme_registered_ctrl {
__le16 cntlid;
__u8 rcsts;
This patch adds support for the pr_ops read_keys callout by calling the NVMe Reservation Report helper, then parsing that info to get the controller's registered keys. Because the callout is only used in the kernel where the callers do not know about controller/host IDs, the callout just returns the registered keys which is required by the SCSI PR in READ KEYS command. Signed-off-by: Mike Christie <michael.christie@oracle.com> --- drivers/nvme/host/pr.c | 73 ++++++++++++++++++++++++++++++++++++++++++ include/linux/nvme.h | 4 +++ 2 files changed, 77 insertions(+)