This commit introduces two helper functions
that facilitate the conversion between the
reservation types used in the NVME protocol
and those used in the block layer.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Changqi Lu <luchangqi.123@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 hw/nvme/nvme.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/hw/nvme/nvme.h b/hw/nvme/nvme.h
index bed8191bd5..6d0e456348 100644
--- a/hw/nvme/nvme.h
+++ b/hw/nvme/nvme.h
@@ -474,6 +474,90 @@ static inline const char *nvme_io_opc_str(uint8_t opc)
     }
 }
 
+static inline NvmeResvType block_pr_type_to_nvme(BlockPrType type)
+{
+    switch (type) {
+    case BLK_PR_WRITE_EXCLUSIVE:
+        return NVME_RESV_WRITE_EXCLUSIVE;
+    case BLK_PR_EXCLUSIVE_ACCESS:
+        return NVME_RESV_EXCLUSIVE_ACCESS;
+    case BLK_PR_WRITE_EXCLUSIVE_REGS_ONLY:
+        return NVME_RESV_WRITE_EXCLUSIVE_REGS_ONLY;
+    case BLK_PR_EXCLUSIVE_ACCESS_REGS_ONLY:
+        return NVME_RESV_EXCLUSIVE_ACCESS_REGS_ONLY;
+    case BLK_PR_WRITE_EXCLUSIVE_ALL_REGS:
+        return NVME_RESV_WRITE_EXCLUSIVE_ALL_REGS;
+    case BLK_PR_EXCLUSIVE_ACCESS_ALL_REGS:
+        return NVME_RESV_EXCLUSIVE_ACCESS_ALL_REGS;
+    }
+
+    return 0;
+}
+
+static inline BlockPrType nvme_pr_type_to_block(NvmeResvType type)
+{
+    switch (type) {
+    case NVME_RESV_WRITE_EXCLUSIVE:
+        return BLK_PR_WRITE_EXCLUSIVE;
+    case NVME_RESV_EXCLUSIVE_ACCESS:
+        return BLK_PR_EXCLUSIVE_ACCESS;
+    case NVME_RESV_WRITE_EXCLUSIVE_REGS_ONLY:
+        return BLK_PR_WRITE_EXCLUSIVE_REGS_ONLY;
+    case NVME_RESV_EXCLUSIVE_ACCESS_REGS_ONLY:
+        return BLK_PR_EXCLUSIVE_ACCESS_REGS_ONLY;
+    case NVME_RESV_WRITE_EXCLUSIVE_ALL_REGS:
+        return BLK_PR_WRITE_EXCLUSIVE_ALL_REGS;
+    case NVME_RESV_EXCLUSIVE_ACCESS_ALL_REGS:
+        return BLK_PR_EXCLUSIVE_ACCESS_ALL_REGS;
+    }
+
+    return 0;
+}
+
+static inline uint8_t nvme_pr_cap_to_block(uint16_t nvme_pr_cap)
+{
+    uint8_t res = 0;
+
+    res |= (nvme_pr_cap & NVME_PR_CAP_PTPL) ?
+           NVME_PR_CAP_PTPL : 0;
+    res |= (nvme_pr_cap & NVME_PR_CAP_WR_EX) ?
+           BLK_PR_CAP_WR_EX : 0;
+    res |= (nvme_pr_cap & NVME_PR_CAP_EX_AC) ?
+           BLK_PR_CAP_EX_AC : 0;
+    res |= (nvme_pr_cap & NVME_PR_CAP_WR_EX_RO) ?
+           BLK_PR_CAP_WR_EX_RO : 0;
+    res |= (nvme_pr_cap & NVME_PR_CAP_EX_AC_RO) ?
+           BLK_PR_CAP_EX_AC_RO : 0;
+    res |= (nvme_pr_cap & NVME_PR_CAP_WR_EX_AR) ?
+           BLK_PR_CAP_WR_EX_AR : 0;
+    res |= (nvme_pr_cap & NVME_PR_CAP_EX_AC_AR) ?
+           BLK_PR_CAP_EX_AC_AR : 0;
+
+    return res;
+}
+
+static inline uint8_t block_pr_cap_to_nvme(uint8_t block_pr_cap)
+{
+    uint16_t res = 0;
+
+    res |= (block_pr_cap & BLK_PR_CAP_PTPL) ?
+              NVME_PR_CAP_PTPL : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_WR_EX) ?
+              NVME_PR_CAP_WR_EX : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_EX_AC) ?
+              NVME_PR_CAP_EX_AC : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_WR_EX_RO) ?
+              NVME_PR_CAP_WR_EX_RO : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_EX_AC_RO) ?
+              NVME_PR_CAP_EX_AC_RO : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_WR_EX_AR) ?
+              NVME_PR_CAP_WR_EX_AR : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_EX_AC_AR) ?
+              NVME_PR_CAP_EX_AC_AR : 0;
+
+    return res;
+}
+
 typedef struct NvmeSQueue {
     struct NvmeCtrl *ctrl;
     uint16_t    sqid;
-- 
2.20.1