[PATCH RFC 1/5] nvme: Add CDQ data structures to nvme spec header

[Joel Granados]

Add Controller Data Queue (CDQ) related data structures and definitions
to include/linux/nvme.h. These are just the data structures. No
functional implementation yet.

Signed-off-by: Joel Granados <joel.granados at kernel.org>
---
 include/linux/nvme.h | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 655d194f8e722c3400ac00f76841e1af0281f38f..4a42f1614de962b9d448193193f68fe1968dfb6f 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -1314,6 +1314,7 @@ enum nvme_admin_opcode {
 	nvme_admin_virtual_mgmt		= 0x1c,
 	nvme_admin_nvme_mi_send		= 0x1d,
 	nvme_admin_nvme_mi_recv		= 0x1e,
+	nvme_admin_cdq			= 0x45,
 	nvme_admin_dbbuf		= 0x7C,
 	nvme_admin_format_nvm		= 0x80,
 	nvme_admin_security_send	= 0x81,
@@ -1352,7 +1353,8 @@ enum nvme_admin_opcode {
 		nvme_admin_opcode_name(nvme_admin_security_send),	\
 		nvme_admin_opcode_name(nvme_admin_security_recv),	\
 		nvme_admin_opcode_name(nvme_admin_sanitize_nvm),	\
-		nvme_admin_opcode_name(nvme_admin_get_lba_status))
+		nvme_admin_opcode_name(nvme_admin_get_lba_status),	\
+		nvme_admin_opcode_name(nvme_admin_cdq))
 
 enum {
 	NVME_QUEUE_PHYS_CONTIG	= (1 << 0),
@@ -1412,6 +1414,10 @@ enum {
 	NVME_FWACT_ACTV		= (2 << 3),
 };
 
+enum {
+	NVME_FEAT_CDQ_ID_MASK = GENMASK(15, 0),
+};
+
 struct nvme_supported_log {
 	__le32	lids[256];
 };
@@ -1590,6 +1596,42 @@ struct nvme_directive_cmd {
 	__u32			rsvd16[3];
 };
 
+enum {
+	NVME_CDQ_SEL_CREATE_CDQ = 0x0,
+	NVME_CDQ_SEL_DELETE_CDQ = 0x1
+};
+
+enum {
+	NVME_CDQ_CFG_PC_DISCONT = 0x0,
+	NVME_CDQ_CFG_PC_CONT = 0x1
+};
+
+union nvme_cdq_dw11 {
+	struct {
+		__le16	flags;
+		__le16	cqs;
+	};
+	struct {
+		__le16	cdqid;
+		__le16	rsvd;
+	};
+};
+
+struct nvme_cdq {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__u32			rsvd1[5];
+	__le64			prp1;
+	__le32			rsvd8[2];
+	__u8			sel;
+	__u8			rsvd10;
+	__le16			mos;
+	union nvme_cdq_dw11	dw11;
+	__le32			cdqsize;
+	__u32			rsvd13[3];
+};
+
 /*
  * Fabrics subcommands.
  */
@@ -2000,6 +2042,7 @@ struct nvme_command {
 		struct nvme_dbbuf dbbuf;
 		struct nvme_directive_cmd directive;
 		struct nvme_io_mgmt_recv_cmd imr;
+		struct nvme_cdq cdq;
 	};
 };
 

-- 
2.50.1