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
 

arch/s390/kernel/ipl.c

@@ -40,6 +40,7 @@
 
 #define IPL_UNKNOWN_STR		"unknown"
 #define IPL_CCW_STR		"ccw"
+#define IPL_ECKD_STR		"eckd"
 #define IPL_FCP_STR		"fcp"
 #define IPL_FCP_DUMP_STR	"fcp_dump"
 #define IPL_NVME_STR		"nvme"
@@ -93,6 +94,8 @@ static char *ipl_type_str(enum ipl_type type)
 	switch (type) {
 	case IPL_TYPE_CCW:
 		return IPL_CCW_STR;
+	case IPL_TYPE_ECKD:
+		return IPL_ECKD_STR;
 	case IPL_TYPE_FCP:
 		return IPL_FCP_STR;
 	case IPL_TYPE_FCP_DUMP:
@@ -148,6 +151,7 @@ static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 static struct ipl_parameter_block *reipl_block_fcp;
 static struct ipl_parameter_block *reipl_block_nvme;
 static struct ipl_parameter_block *reipl_block_ccw;
+static struct ipl_parameter_block *reipl_block_eckd;
 static struct ipl_parameter_block *reipl_block_nss;
 static struct ipl_parameter_block *reipl_block_actual;
 
@@ -162,6 +166,7 @@ static struct sclp_ipl_info sclp_ipl_info;
 static bool reipl_nvme_clear;
 static bool reipl_fcp_clear;
 static bool reipl_ccw_clear;
+static bool reipl_eckd_clear;
 
 static inline int __diag308(unsigned long subcode, void *addr)
 {
@@ -282,6 +287,8 @@ static __init enum ipl_type get_ipl_type(void)
 			return IPL_TYPE_NVME_DUMP;
 		else
 			return IPL_TYPE_NVME;
+	case IPL_PBT_ECKD:
+		return IPL_TYPE_ECKD;
 	}
 	return IPL_TYPE_UNKNOWN;
 }
@@ -335,6 +342,9 @@ static ssize_t sys_ipl_device_show(struct kobject *kobj,
 	case IPL_TYPE_CCW:
 		return sprintf(page, "0.%x.%04x\n", ipl_block.ccw.ssid,
 			       ipl_block.ccw.devno);
+	case IPL_TYPE_ECKD:
+		return sprintf(page, "0.%x.%04x\n", ipl_block.eckd.ssid,
+			       ipl_block.eckd.devno);
 	case IPL_TYPE_FCP:
 	case IPL_TYPE_FCP_DUMP:
 		return sprintf(page, "0.0.%04x\n", ipl_block.fcp.devno);
@@ -380,12 +390,25 @@ static ssize_t ipl_nvme_scp_data_read(struct file *filp, struct kobject *kobj,
 	return memory_read_from_buffer(buf, count, &off, scp_data, size);
 }
 
+static ssize_t ipl_eckd_scp_data_read(struct file *filp, struct kobject *kobj,
+				      struct bin_attribute *attr, char *buf,
+				      loff_t off, size_t count)
+{
+	unsigned int size = ipl_block.eckd.scp_data_len;
+	void *scp_data = &ipl_block.eckd.scp_data;
+
+	return memory_read_from_buffer(buf, count, &off, scp_data, size);
+}
+
 static struct bin_attribute ipl_scp_data_attr =
 	__BIN_ATTR(scp_data, S_IRUGO, ipl_scp_data_read, NULL, PAGE_SIZE);
 
 static struct bin_attribute ipl_nvme_scp_data_attr =
 	__BIN_ATTR(scp_data, S_IRUGO, ipl_nvme_scp_data_read, NULL, PAGE_SIZE);
 
+static struct bin_attribute ipl_eckd_scp_data_attr =
+	__BIN_ATTR(scp_data, S_IRUGO, ipl_eckd_scp_data_read, NULL, PAGE_SIZE);
+
 static struct bin_attribute *ipl_fcp_bin_attrs[] = {
 	&ipl_parameter_attr,
 	&ipl_scp_data_attr,
@@ -398,6 +421,12 @@ static struct bin_attribute *ipl_nvme_bin_attrs[] = {
 	NULL,
 };
 
+static struct bin_attribute *ipl_eckd_bin_attrs[] = {
+	&ipl_parameter_attr,
+	&ipl_eckd_scp_data_attr,
+	NULL,
+};
+
 /* FCP ipl device attributes */
 
 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n",
@@ -419,6 +448,88 @@ DEFINE_IPL_ATTR_RO(ipl_nvme, bootprog, "%lld\n",
 DEFINE_IPL_ATTR_RO(ipl_nvme, br_lba, "%lld\n",
 		   (unsigned long long)ipl_block.nvme.br_lba);
 
+/* ECKD ipl device attributes */
+DEFINE_IPL_ATTR_RO(ipl_eckd, bootprog, "%lld\n",
+		   (unsigned long long)ipl_block.eckd.bootprog);
+
+#define IPL_ATTR_BR_CHR_SHOW_FN(_name, _ipb)				\
+static ssize_t eckd_##_name##_br_chr_show(struct kobject *kobj,		\
+					  struct kobj_attribute *attr,	\
+					  char *buf)			\
+{									\
+	struct ipl_pb0_eckd *ipb = &(_ipb);				\
+									\
+	if (!ipb->br_chr.cyl &&						\
+	    !ipb->br_chr.head &&					\
+	    !ipb->br_chr.record)					\
+		return sprintf(buf, "auto\n");				\
+									\
+	return sprintf(buf, "0x%x,0x%x,0x%x\n",				\
+			ipb->br_chr.cyl,				\
+			ipb->br_chr.head,				\
+			ipb->br_chr.record);				\
+}
+
+#define IPL_ATTR_BR_CHR_STORE_FN(_name, _ipb)				\
+static ssize_t eckd_##_name##_br_chr_store(struct kobject *kobj,	\
+					   struct kobj_attribute *attr,	\
+					   const char *buf, size_t len)	\
+{									\
+	struct ipl_pb0_eckd *ipb = &(_ipb);				\
+	unsigned long args[3] = { 0 };					\
+	char *p, *p1, *tmp = NULL;					\
+	int i, rc;							\
+									\
+	if (!strncmp(buf, "auto", 4))					\
+		goto out;						\
+									\
+	tmp = kstrdup(buf, GFP_KERNEL);					\
+	p = tmp;							\
+	for (i = 0; i < 3; i++) {					\
+		p1 = strsep(&p, ", ");					\
+		if (!p1) {						\
+			rc = -EINVAL;					\
+			goto err;					\
+		}							\
+		rc = kstrtoul(p1, 0, args + i);				\
+		if (rc)							\
+			goto err;					\
+	}								\
+									\
+	rc = -EINVAL;							\
+	if (i != 3)							\
+		goto err;						\
+									\
+	if ((args[0] || args[1]) && !args[2])				\
+		goto err;						\
+									\
+	if (args[0] > UINT_MAX || args[1] > 255 || args[2] > 255)	\
+		goto err;						\
+									\
+out:									\
+	ipb->br_chr.cyl = args[0];					\
+	ipb->br_chr.head = args[1];					\
+	ipb->br_chr.record = args[2];					\
+	rc = len;							\
+err:									\
+	kfree(tmp);							\
+	return rc;							\
+}
+
+IPL_ATTR_BR_CHR_SHOW_FN(ipl, ipl_block.eckd);
+static struct kobj_attribute sys_ipl_eckd_br_chr_attr =
+	__ATTR(br_chr, (S_IRUGO | S_IWUSR),
+	       eckd_ipl_br_chr_show,
+	       NULL);
+
+IPL_ATTR_BR_CHR_SHOW_FN(reipl, reipl_block_eckd->eckd);
+IPL_ATTR_BR_CHR_STORE_FN(reipl, reipl_block_eckd->eckd);
+
+static struct kobj_attribute sys_reipl_eckd_br_chr_attr =
+	__ATTR(br_chr, (S_IRUGO | S_IWUSR),
+	       eckd_reipl_br_chr_show,
+	       eckd_reipl_br_chr_store);
+
 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
 				     struct kobj_attribute *attr, char *page)
 {
@@ -470,6 +581,20 @@ static struct attribute_group ipl_nvme_attr_group = {
 	.bin_attrs = ipl_nvme_bin_attrs,
 };
 
+static struct attribute *ipl_eckd_attrs[] = {
+	&sys_ipl_type_attr.attr,
+	&sys_ipl_eckd_bootprog_attr.attr,
+	&sys_ipl_eckd_br_chr_attr.attr,
+	&sys_ipl_device_attr.attr,
+	&sys_ipl_secure_attr.attr,
+	&sys_ipl_has_secure_attr.attr,
+	NULL,
+};
+
+static struct attribute_group ipl_eckd_attr_group = {
+	.attrs = ipl_eckd_attrs,
+	.bin_attrs = ipl_eckd_bin_attrs,
+};
 
 /* CCW ipl device attributes */
 
@@ -542,6 +667,9 @@ static int __init ipl_init(void)
 			rc = sysfs_create_group(&ipl_kset->kobj,
 						&ipl_ccw_attr_group_lpar);
 		break;
+	case IPL_TYPE_ECKD:
+		rc = sysfs_create_group(&ipl_kset->kobj, &ipl_eckd_attr_group);
+		break;
 	case IPL_TYPE_FCP:
 	case IPL_TYPE_FCP_DUMP:
 		rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
@@ -986,6 +1114,85 @@ static struct attribute_group reipl_ccw_attr_group_lpar = {
 	.attrs = reipl_ccw_attrs_lpar,
 };
 
+/* ECKD reipl device attributes */
+
+static ssize_t reipl_eckd_scpdata_read(struct file *filp, struct kobject *kobj,
+				       struct bin_attribute *attr,
+				       char *buf, loff_t off, size_t count)
+{
+	size_t size = reipl_block_eckd->eckd.scp_data_len;
+	void *scp_data = reipl_block_eckd->eckd.scp_data;
+
+	return memory_read_from_buffer(buf, count, &off, scp_data, size);
+}
+
+static ssize_t reipl_eckd_scpdata_write(struct file *filp, struct kobject *kobj,
+					struct bin_attribute *attr,
+					char *buf, loff_t off, size_t count)
+{
+	size_t scpdata_len = count;
+	size_t padding;
+
+	if (off)
+		return -EINVAL;
+
+	memcpy(reipl_block_eckd->eckd.scp_data, buf, count);
+	if (scpdata_len % 8) {
+		padding = 8 - (scpdata_len % 8);
+		memset(reipl_block_eckd->eckd.scp_data + scpdata_len,
+		       0, padding);
+		scpdata_len += padding;
+	}
+
+	reipl_block_eckd->hdr.len = IPL_BP_ECKD_LEN + scpdata_len;
+	reipl_block_eckd->eckd.len = IPL_BP0_ECKD_LEN + scpdata_len;
+	reipl_block_eckd->eckd.scp_data_len = scpdata_len;
+
+	return count;
+}
+
+static struct bin_attribute sys_reipl_eckd_scp_data_attr =
+	__BIN_ATTR(scp_data, (S_IRUGO | S_IWUSR), reipl_eckd_scpdata_read,
+		   reipl_eckd_scpdata_write, DIAG308_SCPDATA_SIZE);
+
+static struct bin_attribute *reipl_eckd_bin_attrs[] = {
+	&sys_reipl_eckd_scp_data_attr,
+	NULL,
+};
+
+DEFINE_IPL_CCW_ATTR_RW(reipl_eckd, device, reipl_block_eckd->eckd);
+DEFINE_IPL_ATTR_RW(reipl_eckd, bootprog, "%lld\n", "%lld\n",
+		   reipl_block_eckd->eckd.bootprog);
+
+static struct attribute *reipl_eckd_attrs[] = {
+	&sys_reipl_eckd_device_attr.attr,
+	&sys_reipl_eckd_bootprog_attr.attr,
+	&sys_reipl_eckd_br_chr_attr.attr,
+	NULL,
+};
+
+static struct attribute_group reipl_eckd_attr_group = {
+	.attrs = reipl_eckd_attrs,
+	.bin_attrs = reipl_eckd_bin_attrs
+};
+
+static ssize_t reipl_eckd_clear_show(struct kobject *kobj,
+				     struct kobj_attribute *attr, char *page)
+{
+	return sprintf(page, "%u\n", reipl_eckd_clear);
+}
+
+static ssize_t reipl_eckd_clear_store(struct kobject *kobj,
+				      struct kobj_attribute *attr,
+				      const char *buf, size_t len)
+{
+	if (strtobool(buf, &reipl_eckd_clear) < 0)
+		return -EINVAL;
+	return len;
+}
+
+static struct kobj_attribute sys_reipl_eckd_clear_attr =
+	__ATTR(clear, 0644, reipl_eckd_clear_show, reipl_eckd_clear_store);
 
 /* NSS reipl device attributes */
 static void reipl_get_ascii_nss_name(char *dst,
@@ -1069,6 +1276,9 @@ static int reipl_set_type(enum ipl_type type)
 	case IPL_TYPE_CCW:
 		reipl_block_actual = reipl_block_ccw;
 		break;
+	case IPL_TYPE_ECKD:
+		reipl_block_actual = reipl_block_eckd;
+		break;
 	case IPL_TYPE_FCP:
 		reipl_block_actual = reipl_block_fcp;
 		break;
@@ -1099,6 +1309,8 @@ static ssize_t reipl_type_store(struct kobject *kobj,
 
 	if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 		rc = reipl_set_type(IPL_TYPE_CCW);
+	else if (strncmp(buf, IPL_ECKD_STR, strlen(IPL_ECKD_STR)) == 0)
+		rc = reipl_set_type(IPL_TYPE_ECKD);
 	else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 		rc = reipl_set_type(IPL_TYPE_FCP);
 	else if (strncmp(buf, IPL_NVME_STR, strlen(IPL_NVME_STR)) == 0)
@@ -1114,6 +1326,7 @@ static struct kobj_attribute reipl_type_attr =
 static struct kset *reipl_kset;
 static struct kset *reipl_fcp_kset;
 static struct kset *reipl_nvme_kset;
+static struct kset *reipl_eckd_kset;
 
 static void __reipl_run(void *unused)
 {
@@ -1125,6 +1338,13 @@ static void __reipl_run(void *unused)
 		else
 			diag308(DIAG308_LOAD_NORMAL_DUMP, NULL);
 		break;
+	case IPL_TYPE_ECKD:
+		diag308(DIAG308_SET, reipl_block_eckd);
+		if (reipl_eckd_clear)
+			diag308(DIAG308_LOAD_CLEAR, NULL);
+		else
+			diag308(DIAG308_LOAD_NORMAL, NULL);
+		break;
 	case IPL_TYPE_FCP:
 		diag308(DIAG308_SET, reipl_block_fcp);
 		if (reipl_fcp_clear)
@@ -1345,6 +1565,58 @@ out1:
 	return rc;
 }
 
+static int __init reipl_eckd_init(void)
+{
+	int rc;
+
+	if (!sclp.has_sipl_eckd)
+		return 0;
+
+	reipl_block_eckd = (void *)get_zeroed_page(GFP_KERNEL);
+	if (!reipl_block_eckd)
+		return -ENOMEM;
+
+	/* sysfs: create kset for mixing attr group and bin attrs */
+	reipl_eckd_kset = kset_create_and_add(IPL_ECKD_STR, NULL,
+					      &reipl_kset->kobj);
+	if (!reipl_eckd_kset) {
+		free_page((unsigned long)reipl_block_eckd);
+		return -ENOMEM;
+	}
+
+	rc = sysfs_create_group(&reipl_eckd_kset->kobj, &reipl_eckd_attr_group);
+	if (rc)
+		goto out1;
+
+	if (test_facility(141)) {
+		rc = sysfs_create_file(&reipl_eckd_kset->kobj,
+				       &sys_reipl_eckd_clear_attr.attr);
+		if (rc)
+			goto out2;
+	} else {
+		reipl_eckd_clear = true;
+	}
+
+	if (ipl_info.type == IPL_TYPE_ECKD) {
+		memcpy(reipl_block_eckd, &ipl_block, sizeof(ipl_block));
+	} else {
+		reipl_block_eckd->hdr.len = IPL_BP_ECKD_LEN;
+		reipl_block_eckd->hdr.version = IPL_PARM_BLOCK_VERSION;
+		reipl_block_eckd->eckd.len = IPL_BP0_ECKD_LEN;
+		reipl_block_eckd->eckd.pbt = IPL_PBT_ECKD;
+		reipl_block_eckd->eckd.opt = IPL_PB0_ECKD_OPT_IPL;
+	}
+	reipl_capabilities |= IPL_TYPE_ECKD;
+	return 0;
+
+out2:
+	sysfs_remove_group(&reipl_eckd_kset->kobj, &reipl_eckd_attr_group);
+out1:
+	kset_unregister(reipl_eckd_kset);
+	free_page((unsigned long)reipl_block_eckd);
+	return rc;
+}
+
 static int __init reipl_type_init(void)
 {
 	enum ipl_type reipl_type = ipl_info.type;
@@ -1366,6 +1638,9 @@ static int __init reipl_type_init(void)
 	} else if (reipl_block->pb0_hdr.pbt == IPL_PBT_CCW) {
 		memcpy(reipl_block_ccw, reipl_block, size);
 		reipl_type = IPL_TYPE_CCW;
+	} else if (reipl_block->pb0_hdr.pbt == IPL_PBT_ECKD) {
+		memcpy(reipl_block_eckd, reipl_block, size);
+		reipl_type = IPL_TYPE_ECKD;
 	}
 out:
 	return reipl_set_type(reipl_type);
@@ -1384,6 +1659,9 @@ static int __init reipl_init(void)
 		return rc;
 	}
 	rc = reipl_ccw_init();
+	if (rc)
+		return rc;
+	rc = reipl_eckd_init();
 	if (rc)
 		return rc;
 	rc = reipl_fcp_init();
@@ -2058,6 +2336,10 @@ void __init setup_ipl(void)
 		ipl_info.data.ccw.dev_id.ssid = ipl_block.ccw.ssid;
 		ipl_info.data.ccw.dev_id.devno = ipl_block.ccw.devno;
 		break;
+	case IPL_TYPE_ECKD:
+		ipl_info.data.eckd.dev_id.ssid = ipl_block.eckd.ssid;
+		ipl_info.data.eckd.dev_id.devno = ipl_block.eckd.devno;
+		break;
 	case IPL_TYPE_FCP:
 	case IPL_TYPE_FCP_DUMP:
 		ipl_info.data.fcp.dev_id.ssid = 0;

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;