[PATCH] s390: export ipl device parameters
Sysfs interface to export ipl device parameters. Dependent on the ipl type
the interface will look like this:
- ccw ipl:
/sys/firmware/ipl/device
/ipl_type
- fcp ipl:
/sys/firmware/ipl/binary_parameter
/bootprog
/br_lba
/device
/ipl_type
/lun
/scp_data
/wwpn
- otherwise (unknown that is):
/sys/firmware/ipl/ipl_type
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 5204778..31e7b19 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -36,6 +36,7 @@
#include <linux/console.h>
#include <linux/seq_file.h>
#include <linux/kernel_stat.h>
+#include <linux/device.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -685,3 +686,188 @@
.show = show_cpuinfo,
};
+#define DEFINE_IPL_ATTR(_name, _format, _value) \
+static ssize_t ipl_##_name##_show(struct subsystem *subsys, \
+ char *page) \
+{ \
+ return sprintf(page, _format, _value); \
+} \
+static struct subsys_attribute ipl_##_name##_attr = \
+ __ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
+
+DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
+ IPL_PARMBLOCK_START->fcp.wwpn);
+DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
+ IPL_PARMBLOCK_START->fcp.lun);
+DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
+ IPL_PARMBLOCK_START->fcp.bootprog);
+DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
+ IPL_PARMBLOCK_START->fcp.br_lba);
+
+enum ipl_type_type {
+ ipl_type_unknown,
+ ipl_type_ccw,
+ ipl_type_fcp,
+};
+
+static enum ipl_type_type
+get_ipl_type(void)
+{
+ struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
+
+ if (!IPL_DEVNO_VALID)
+ return ipl_type_unknown;
+ if (!IPL_PARMBLOCK_VALID)
+ return ipl_type_ccw;
+ if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
+ return ipl_type_unknown;
+ if (ipl->fcp.pbt != IPL_TYPE_FCP)
+ return ipl_type_unknown;
+ return ipl_type_fcp;
+}
+
+static ssize_t
+ipl_type_show(struct subsystem *subsys, char *page)
+{
+ switch (get_ipl_type()) {
+ case ipl_type_ccw:
+ return sprintf(page, "ccw\n");
+ case ipl_type_fcp:
+ return sprintf(page, "fcp\n");
+ default:
+ return sprintf(page, "unknown\n");
+ }
+}
+
+static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
+
+static ssize_t
+ipl_device_show(struct subsystem *subsys, char *page)
+{
+ struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
+
+ switch (get_ipl_type()) {
+ case ipl_type_ccw:
+ return sprintf(page, "0.0.%04x\n", ipl_devno);
+ case ipl_type_fcp:
+ return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
+ default:
+ return 0;
+ }
+}
+
+static struct subsys_attribute ipl_device_attr =
+ __ATTR(device, S_IRUGO, ipl_device_show, NULL);
+
+static struct attribute *ipl_fcp_attrs[] = {
+ &ipl_type_attr.attr,
+ &ipl_device_attr.attr,
+ &ipl_wwpn_attr.attr,
+ &ipl_lun_attr.attr,
+ &ipl_bootprog_attr.attr,
+ &ipl_br_lba_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ipl_fcp_attr_group = {
+ .attrs = ipl_fcp_attrs,
+};
+
+static struct attribute *ipl_ccw_attrs[] = {
+ &ipl_type_attr.attr,
+ &ipl_device_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ipl_ccw_attr_group = {
+ .attrs = ipl_ccw_attrs,
+};
+
+static struct attribute *ipl_unknown_attrs[] = {
+ &ipl_type_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ipl_unknown_attr_group = {
+ .attrs = ipl_unknown_attrs,
+};
+
+static ssize_t
+ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ unsigned int size = IPL_PARMBLOCK_SIZE;
+
+ if (off > size)
+ return 0;
+ if (off + count > size)
+ count = size - off;
+
+ memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
+ return count;
+}
+
+static struct bin_attribute ipl_parameter_attr = {
+ .attr = {
+ .name = "binary_parameter",
+ .mode = S_IRUGO,
+ .owner = THIS_MODULE,
+ },
+ .size = PAGE_SIZE,
+ .read = &ipl_parameter_read,
+};
+
+static ssize_t
+ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ unsigned int size = IPL_PARMBLOCK_START->fcp.scp_data_len;
+ void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
+
+ if (off > size)
+ return 0;
+ if (off + count > size)
+ count = size - off;
+
+ memcpy(buf, scp_data + off, count);
+ return count;
+}
+
+static struct bin_attribute ipl_scp_data_attr = {
+ .attr = {
+ .name = "scp_data",
+ .mode = S_IRUGO,
+ .owner = THIS_MODULE,
+ },
+ .size = PAGE_SIZE,
+ .read = &ipl_scp_data_read,
+};
+
+static decl_subsys(ipl, NULL, NULL);
+
+static int __init
+ipl_device_sysfs_register(void) {
+ int rc;
+
+ rc = firmware_register(&ipl_subsys);
+ if (rc)
+ return rc;
+
+ switch (get_ipl_type()) {
+ case ipl_type_ccw:
+ sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
+ break;
+ case ipl_type_fcp:
+ sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
+ sysfs_create_bin_file(&ipl_subsys.kset.kobj,
+ &ipl_parameter_attr);
+ sysfs_create_bin_file(&ipl_subsys.kset.kobj,
+ &ipl_scp_data_attr);
+ break;
+ default:
+ sysfs_create_group(&ipl_subsys.kset.kobj,
+ &ipl_unknown_attr_group);
+ break;
+ }
+ return 0;
+}
+
+__initcall(ipl_device_sysfs_register);