[S390] boot from NSS support

Add support to boot from a named saved segment (NSS).

Signed-off-by: Hongjie Yang <hongjie@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 2c91226e1d40..13eacce62011 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -34,12 +34,14 @@ enum ipl_type {
         IPL_TYPE_UNKNOWN = 2,
         IPL_TYPE_CCW     = 4,
         IPL_TYPE_FCP     = 8,
+        IPL_TYPE_NSS     = 16,
 };
 
 #define IPL_NONE_STR     "none"
 #define IPL_UNKNOWN_STR  "unknown"
 #define IPL_CCW_STR      "ccw"
 #define IPL_FCP_STR      "fcp"
+#define IPL_NSS_STR      "nss"
 
 static char *ipl_type_str(enum ipl_type type)
 {
@@ -50,6 +52,8 @@ static char *ipl_type_str(enum ipl_type type)
                 return IPL_CCW_STR;
         case IPL_TYPE_FCP:
                 return IPL_FCP_STR;
+        case IPL_TYPE_NSS:
+                return IPL_NSS_STR;
         case IPL_TYPE_UNKNOWN:
         default:
                 return IPL_UNKNOWN_STR;
@@ -64,6 +68,7 @@ enum ipl_method {
         IPL_METHOD_FCP_RO_DIAG,
         IPL_METHOD_FCP_RW_DIAG,
         IPL_METHOD_FCP_RO_VM,
+        IPL_METHOD_NSS,
 };
 
 enum shutdown_action {
@@ -114,11 +119,14 @@ enum diag308_rc {
 static int diag308_set_works = 0;
 
 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
+
 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 static enum ipl_method reipl_method = IPL_METHOD_NONE;
 static struct ipl_parameter_block *reipl_block_fcp;
 static struct ipl_parameter_block *reipl_block_ccw;
 
+static char reipl_nss_name[NSS_NAME_SIZE + 1];
+
 static int dump_capabilities = IPL_TYPE_NONE;
 static enum ipl_type dump_type = IPL_TYPE_NONE;
 static enum ipl_method dump_method = IPL_METHOD_NONE;
@@ -173,6 +181,24 @@ static struct subsys_attribute sys_##_prefix##_##_name##_attr =		\
                         sys_##_prefix##_##_name##_show,                 \
                         sys_##_prefix##_##_name##_store);
 
+#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
+static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
+                char *page)                                             \
+{                                                                       \
+        return sprintf(page, _fmt_out, _value);                         \
+}                                                                       \
+static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
+                const char *buf, size_t len)                            \
+{                                                                       \
+        if (sscanf(buf, _fmt_in, _value) != 1)                          \
+                return -EINVAL;                                         \
+        return len;                                                     \
+}                                                                       \
+static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
+        __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
+                        sys_##_prefix##_##_name##_show,                 \
+                        sys_##_prefix##_##_name##_store);
+
 static void make_attrs_ro(struct attribute **attrs)
 {
         while (*attrs) {
@@ -189,6 +215,8 @@ static enum ipl_type ipl_get_type(void)
 {
         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 
+        if (ipl_flags & IPL_NSS_VALID)
+                return IPL_TYPE_NSS;
         if (!(ipl_flags & IPL_DEVNO_VALID))
                 return IPL_TYPE_UNKNOWN;
         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
@@ -324,6 +352,20 @@ static struct attribute_group ipl_ccw_attr_group = {
         .attrs = ipl_ccw_attrs,
 };
 
+/* NSS ipl device attributes */
+
+DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
+
+static struct attribute *ipl_nss_attrs[] = {
+        &sys_ipl_type_attr.attr,
+        &sys_ipl_nss_name_attr.attr,
+        NULL,
+};
+
+static struct attribute_group ipl_nss_attr_group = {
+        .attrs = ipl_nss_attrs,
+};
+
 /* UNKNOWN ipl device attributes */
 
 static struct attribute *ipl_unknown_attrs[] = {
@@ -432,6 +474,21 @@ static struct attribute_group reipl_ccw_attr_group = {
         .attrs = reipl_ccw_attrs,
 };
 
+
+/* NSS reipl device attributes */
+
+DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
+
+static struct attribute *reipl_nss_attrs[] = {
+        &sys_reipl_nss_name_attr.attr,
+        NULL,
+};
+
+static struct attribute_group reipl_nss_attr_group = {
+        .name  = IPL_NSS_STR,
+        .attrs = reipl_nss_attrs,
+};
+
 /* reipl type */
 
 static int reipl_set_type(enum ipl_type type)
@@ -454,6 +511,9 @@ static int reipl_set_type(enum ipl_type type)
                 else
                         reipl_method = IPL_METHOD_FCP_RO_DIAG;
                 break;
+        case IPL_TYPE_NSS:
+                reipl_method = IPL_METHOD_NSS;
+                break;
         default:
                 reipl_method = IPL_METHOD_NONE;
         }
@@ -475,6 +535,8 @@ static ssize_t reipl_type_store(struct subsystem *subsys, const char *buf,
                 rc = reipl_set_type(IPL_TYPE_CCW);
         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
                 rc = reipl_set_type(IPL_TYPE_FCP);
+        else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
+                rc = reipl_set_type(IPL_TYPE_NSS);
         return (rc != 0) ? rc : len;
 }
 
@@ -647,6 +709,10 @@ void do_reipl(void)
         case IPL_METHOD_FCP_RO_VM:
                 __cpcmd("IPL", NULL, 0, NULL);
                 break;
+        case IPL_METHOD_NSS:
+                sprintf(buf, "IPL %s", reipl_nss_name);
+                __cpcmd(buf, NULL, 0, NULL);
+                break;
         case IPL_METHOD_NONE:
         default:
                 if (MACHINE_IS_VM)
@@ -733,6 +799,10 @@ static int __init ipl_init(void)
         case IPL_TYPE_FCP:
                 rc = ipl_register_fcp_files();
                 break;
+        case IPL_TYPE_NSS:
+                rc = sysfs_create_group(&ipl_subsys.kset.kobj,
+                                        &ipl_nss_attr_group);
+                break;
         default:
                 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
                                         &ipl_unknown_attr_group);
@@ -755,6 +825,20 @@ static void __init reipl_probe(void)
         free_page((unsigned long)buffer);
 }
 
+static int __init reipl_nss_init(void)
+{
+        int rc;
+
+        if (!MACHINE_IS_VM)
+                return 0;
+        rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_nss_attr_group);
+        if (rc)
+                return rc;
+        strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
+        reipl_capabilities |= IPL_TYPE_NSS;
+        return 0;
+}
+
 static int __init reipl_ccw_init(void)
 {
         int rc;
@@ -837,6 +921,9 @@ static int __init reipl_init(void)
         rc = reipl_fcp_init();
         if (rc)
                 return rc;
+        rc = reipl_nss_init();
+        if (rc)
+                return rc;
         rc = reipl_set_type(ipl_get_type());
         if (rc)
                 return rc;