s390/ipl: add eckd support

This adds support to IPL from ECKD DASDs to linux.
It introduces a few sysfs files in /sys/firmware/reipl/eckd:

bootprog: the boot program selector
clear:    whether to issue a diag308 LOAD_NORMAL or LOAD_CLEAR
device:   the device to ipl from
br_chr:   Cylinder/Head/Record number to read the bootrecord from.
          Might be '0' or 'auto' if it should be read from the
	  volume label.
scpdata:  data to be passed to the ipl'd program.

The new ipl type is called 'eckd'.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/boot/ipl_parm.c

@@ -108,6 +108,11 @@ static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
 		scp_data_len = ipb->nvme.scp_data_len;
 		scp_data = ipb->nvme.scp_data;
 		break;
+	case IPL_PBT_ECKD:
+		scp_data_len = ipb->eckd.scp_data_len;
+		scp_data = ipb->eckd.scp_data;
+		break;
+
 	default:
 		goto out;
 	}
@@ -153,6 +158,7 @@ static void append_ipl_block_parm(void)
 		break;
 	case IPL_PBT_FCP:
 	case IPL_PBT_NVME:
+	case IPL_PBT_ECKD:
 		rc = ipl_block_get_ascii_scpdata(
 			parm, COMMAND_LINE_SIZE - len - 1, &ipl_block);
 		break;

arch/s390/include/asm/ipl.h

@@ -22,6 +22,7 @@ struct ipl_parameter_block {
 		struct ipl_pb0_common common;
 		struct ipl_pb0_fcp fcp;
 		struct ipl_pb0_ccw ccw;
+		struct ipl_pb0_eckd eckd;
 		struct ipl_pb0_nvme nvme;
 		char raw[PAGE_SIZE - sizeof(struct ipl_pl_hdr)];
 	};
@@ -41,6 +42,10 @@ struct ipl_parameter_block {
 			      sizeof(struct ipl_pb0_ccw))
 #define IPL_BP0_CCW_LEN (sizeof(struct ipl_pb0_ccw))
 
+#define IPL_BP_ECKD_LEN (sizeof(struct ipl_pl_hdr) + \
+			      sizeof(struct ipl_pb0_eckd))
+#define IPL_BP0_ECKD_LEN (sizeof(struct ipl_pb0_eckd))
+
 #define IPL_MAX_SUPPORTED_VERSION (0)
 
 #define IPL_RB_CERT_UNKNOWN ((unsigned short)-1)
@@ -68,6 +73,7 @@ enum ipl_type {
 	IPL_TYPE_NSS		= 16,
 	IPL_TYPE_NVME		= 32,
 	IPL_TYPE_NVME_DUMP	= 64,
+	IPL_TYPE_ECKD		= 128,
 };
 
 struct ipl_info
@@ -77,6 +83,9 @@ struct ipl_info
 		struct {
 			struct ccw_dev_id dev_id;
 		} ccw;
+		struct {
+			struct ccw_dev_id dev_id;
+		} eckd;
 		struct {
 			struct ccw_dev_id dev_id;
 			u64 wwpn;

arch/s390/include/asm/sclp.h

@@ -87,6 +87,7 @@ struct sclp_info {
 	unsigned char has_gisaf : 1;
 	unsigned char has_diag318 : 1;
 	unsigned char has_sipl : 1;
+	unsigned char has_sipl_eckd : 1;
 	unsigned char has_dirq : 1;
 	unsigned char has_iplcc : 1;
 	unsigned char has_zpci_lsi : 1;

arch/s390/include/uapi/asm/ipl.h

@@ -27,6 +27,7 @@ enum ipl_pbt {
 	IPL_PBT_FCP = 0,
 	IPL_PBT_SCP_DATA = 1,
 	IPL_PBT_CCW = 2,
+	IPL_PBT_ECKD = 3,
 	IPL_PBT_NVME = 4,
 };
 
@@ -111,6 +112,33 @@ struct ipl_pb0_ccw {
 	__u8  reserved5[8];
 } __packed;
 
+/* IPL Parameter Block 0 for ECKD */
+struct ipl_pb0_eckd {
+	__u32 len;
+	__u8  pbt;
+	__u8  reserved1[3];
+	__u32 reserved2[78];
+	__u8  opt;
+	__u8  reserved4[4];
+	__u8  reserved5:5;
+	__u8  ssid:3;
+	__u16 devno;
+	__u32 reserved6[5];
+	__u32 bootprog;
+	__u8  reserved7[12];
+	struct {
+		__u16 cyl;
+		__u8 head;
+		__u8 record;
+		__u32 reserved;
+	} br_chr __packed;
+	__u32 scp_data_len;
+	__u8  reserved8[260];
+	__u8  scp_data[];
+} __packed;
+
+#define IPL_PB0_ECKD_OPT_IPL	0x10
+
 #define IPL_PB0_CCW_VM_FLAG_NSS		0x80
 #define IPL_PB0_CCW_VM_FLAG_VP		0x40
 

drivers/s390/char/sclp_early.c

@@ -57,8 +57,10 @@ static void __init sclp_early_facilities_detect(void)
 		sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
 		sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
 	}
-	if (sccb->cpuoff > 137)
+	if (sccb->cpuoff > 137) {
 		sclp.has_sipl = !!(sccb->cbl & 0x4000);
+		sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000);
+	}
 	sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
 	sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
 	sclp.rzm <<= 20;