s390/ipl: provide uapi header for list directed IPL

The IPL parameter block is used as an interface between Linux and
the machine to query and change the boot device and boot options.
To be able to create IPL parameter block in user space and pass it
as segment to kexec provide an uapi header with proper structure
definitions for the block.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 116 insertions, 81 deletions

diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index 3530b613234f..878f6fd5f2e7 100644
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -12,74 +12,34 @@
 #include <asm/types.h>
 #include <asm/cio.h>
 #include <asm/setup.h>
+#include <uapi/asm/ipl.h>
 
-#define NSS_NAME_SIZE	8
-
-#define IPL_PARM_BLK_FCP_LEN (sizeof(struct ipl_list_hdr) + \
-			      sizeof(struct ipl_block_fcp))
-
-#define IPL_PARM_BLK0_FCP_LEN (sizeof(struct ipl_block_fcp) + 16)
+struct ipl_parameter_block {
+	struct ipl_pl_hdr hdr;
+	union {
+		struct ipl_pb_hdr pb0_hdr;
+		struct ipl_pb0_common common;
+		struct ipl_pb0_fcp fcp;
+		struct ipl_pb0_ccw ccw;
+		char raw[PAGE_SIZE - sizeof(struct ipl_pl_hdr)];
+	};
+} __packed __aligned(PAGE_SIZE);
 
-#define IPL_PARM_BLK_CCW_LEN (sizeof(struct ipl_list_hdr) + \
-			      sizeof(struct ipl_block_ccw))
+#define NSS_NAME_SIZE 8
 
-#define IPL_PARM_BLK0_CCW_LEN (sizeof(struct ipl_block_ccw) + 16)
+#define IPL_BP_FCP_LEN (sizeof(struct ipl_pl_hdr) + \
+			      sizeof(struct ipl_pb0_fcp))
+#define IPL_BP0_FCP_LEN (sizeof(struct ipl_pb0_fcp))
+#define IPL_BP_CCW_LEN (sizeof(struct ipl_pl_hdr) + \
+			      sizeof(struct ipl_pb0_ccw))
+#define IPL_BP0_CCW_LEN (sizeof(struct ipl_pb0_ccw))
 
 #define IPL_MAX_SUPPORTED_VERSION (0)
 
-struct ipl_list_hdr {
-	u32 len;
-	u8  reserved1[3];
-	u8  version;
-	u32 blk0_len;
-	u8  pbt;
-	u8  flags;
-	u16 reserved2;
-	u8  loadparm[8];
-} __attribute__((packed));
-
-struct ipl_block_fcp {
-	u8  reserved1[305-1];
-	u8  opt;
-	u8  reserved2[3];
-	u16 reserved3;
-	u16 devno;
-	u8  reserved4[4];
-	u64 wwpn;
-	u64 lun;
-	u32 bootprog;
-	u8  reserved5[12];
-	u64 br_lba;
-	u32 scp_data_len;
-	u8  reserved6[260];
-	u8  scp_data[];
-} __attribute__((packed));
-
-#define DIAG308_VMPARM_SIZE	64
-#define DIAG308_SCPDATA_SIZE	(PAGE_SIZE - (sizeof(struct ipl_list_hdr) + \
-				 offsetof(struct ipl_block_fcp, scp_data)))
-
-struct ipl_block_ccw {
-	u8  reserved1[84];
-	u16 reserved2 : 13;
-	u8  ssid : 3;
-	u16 devno;
-	u8  vm_flags;
-	u8  reserved3[3];
-	u32 vm_parm_len;
-	u8  nss_name[8];
-	u8  vm_parm[DIAG308_VMPARM_SIZE];
-	u8  reserved4[8];
-} __attribute__((packed));
-
-struct ipl_parameter_block {
-	struct ipl_list_hdr hdr;
-	union {
-		struct ipl_block_fcp fcp;
-		struct ipl_block_ccw ccw;
-		char raw[PAGE_SIZE - sizeof(struct ipl_list_hdr)];
-	};
-} __packed __aligned(PAGE_SIZE);
+#define DIAG308_VMPARM_SIZE (64)
+#define DIAG308_SCPDATA_OFFSET offsetof(struct ipl_parameter_block, \
+					fcp.scp_data)
+#define DIAG308_SCPDATA_SIZE (PAGE_SIZE - DIAG308_SCPDATA_OFFSET)
 
 struct save_area;
 struct save_area * __init save_area_alloc(bool is_boot_cpu);
@@ -132,25 +92,6 @@ enum diag308_subcode  {
 	DIAG308_STORE = 6,
 };
 
-enum diag308_ipl_type {
-	DIAG308_IPL_TYPE_FCP	= 0,
-	DIAG308_IPL_TYPE_CCW	= 2,
-};
-
-enum diag308_opt {
-	DIAG308_IPL_OPT_IPL	= 0x10,
-	DIAG308_IPL_OPT_DUMP	= 0x20,
-};
-
-enum diag308_flags {
-	DIAG308_FLAGS_LP_VALID	= 0x80,
-};
-
-enum diag308_vm_flags {
-	DIAG308_VM_FLAGS_NSS_VALID	= 0x80,
-	DIAG308_VM_FLAGS_VP_VALID	= 0x40,
-};
-
 enum diag308_rc {
 	DIAG308_RC_OK		= 0x0001,
 	DIAG308_RC_NOCONFIG	= 0x0102,
diff --git a/arch/s390/include/uapi/asm/ipl.h b/arch/s390/include/uapi/asm/ipl.h
new file mode 100644
index 000000000000..3b513b39fca0
--- /dev/null
+++ b/arch/s390/include/uapi/asm/ipl.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_UAPI_IPL_H
+#define _ASM_S390_UAPI_IPL_H
+
+#include <linux/types.h>
+
+/* IPL Parameter List header */
+struct ipl_pl_hdr {
+	__u32 len;
+	__u8  reserved1[3];
+	__u8  version;
+} __packed;
+
+/* IPL Parameter Block header */
+struct ipl_pb_hdr {
+	__u32 len;
+	__u8  pbt;
+} __packed;
+
+/* IPL Parameter Block types */
+enum ipl_pbt {
+	IPL_PBT_FCP = 0,
+	IPL_PBT_SCP_DATA = 1,
+	IPL_PBT_CCW = 2,
+};
+
+/* IPL Parameter Block 0 with common fields */
+struct ipl_pb0_common {
+	__u32 len;
+	__u8  pbt;
+	__u8  flags;
+	__u8  reserved1[2];
+	__u8  loadparm[8];
+	__u8  reserved2[84];
+} __packed;
+
+#define IPL_PB0_FLAG_LOADPARM	0x80
+
+/* IPL Parameter Block 0 for FCP */
+struct ipl_pb0_fcp {
+	__u32 len;
+	__u8  pbt;
+	__u8  reserved1[3];
+	__u8  loadparm[8];
+	__u8  reserved2[304];
+	__u8  opt;
+	__u8  reserved3[3];
+	__u8  cssid;
+	__u8  reserved4[1];
+	__u16 devno;
+	__u8  reserved5[4];
+	__u64 wwpn;
+	__u64 lun;
+	__u32 bootprog;
+	__u8  reserved6[12];
+	__u64 br_lba;
+	__u32 scp_data_len;
+	__u8  reserved7[260];
+	__u8  scp_data[];
+} __packed;
+
+#define IPL_PB0_FCP_OPT_IPL	0x10
+#define IPL_PB0_FCP_OPT_DUMP	0x20
+
+/* IPL Parameter Block 0 for CCW */
+struct ipl_pb0_ccw {
+	__u32 len;
+	__u8  pbt;
+	__u8  flags;
+	__u8  reserved1[2];
+	__u8  loadparm[8];
+	__u8  reserved2[84];
+	__u16 reserved3 : 13;
+	__u8  ssid : 3;
+	__u16 devno;
+	__u8  vm_flags;
+	__u8  reserved4[3];
+	__u32 vm_parm_len;
+	__u8  nss_name[8];
+	__u8  vm_parm[64];
+	__u8  reserved5[8];
+} __packed;
+
+#define IPL_PB0_CCW_VM_FLAG_NSS		0x80
+#define IPL_PB0_CCW_VM_FLAG_VP		0x40
+
+/* IPL Parameter Block 1 for additional SCP data */
+struct ipl_pb1_scp_data {
+	__u32 len;
+	__u8  pbt;
+	__u8  scp_data[];
+} __packed;
+
+#endif