[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>
This commit is contained in:
Heiko Carstens
committed by
Linus Torvalds
Linus Torvalds
parent
ed3cb6f039
commit
1e8e338325
@ -36,6 +36,7 @@
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#include <linux/console.h>
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#include <linux/seq_file.h>
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#include <linux/kernel_stat.h>
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#include <linux/device.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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@ -685,3 +686,188 @@ struct seq_operations cpuinfo_op = {
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.show = show_cpuinfo,
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};
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#define DEFINE_IPL_ATTR(_name, _format, _value) \
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static ssize_t ipl_##_name##_show(struct subsystem *subsys, \
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char *page) \
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{ \
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return sprintf(page, _format, _value); \
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} \
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static struct subsys_attribute ipl_##_name##_attr = \
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__ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
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DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
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IPL_PARMBLOCK_START->fcp.wwpn);
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DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
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IPL_PARMBLOCK_START->fcp.lun);
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DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
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IPL_PARMBLOCK_START->fcp.bootprog);
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DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
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IPL_PARMBLOCK_START->fcp.br_lba);
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enum ipl_type_type {
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ipl_type_unknown,
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ipl_type_ccw,
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ipl_type_fcp,
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};
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static enum ipl_type_type
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get_ipl_type(void)
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{
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struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
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if (!IPL_DEVNO_VALID)
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return ipl_type_unknown;
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if (!IPL_PARMBLOCK_VALID)
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return ipl_type_ccw;
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if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
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return ipl_type_unknown;
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if (ipl->fcp.pbt != IPL_TYPE_FCP)
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return ipl_type_unknown;
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return ipl_type_fcp;
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}
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static ssize_t
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ipl_type_show(struct subsystem *subsys, char *page)
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{
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switch (get_ipl_type()) {
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case ipl_type_ccw:
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return sprintf(page, "ccw\n");
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case ipl_type_fcp:
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return sprintf(page, "fcp\n");
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default:
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return sprintf(page, "unknown\n");
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}
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}
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static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
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static ssize_t
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ipl_device_show(struct subsystem *subsys, char *page)
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{
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struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
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switch (get_ipl_type()) {
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case ipl_type_ccw:
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return sprintf(page, "0.0.%04x\n", ipl_devno);
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case ipl_type_fcp:
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return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
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default:
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return 0;
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}
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}
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static struct subsys_attribute ipl_device_attr =
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__ATTR(device, S_IRUGO, ipl_device_show, NULL);
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static struct attribute *ipl_fcp_attrs[] = {
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&ipl_type_attr.attr,
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&ipl_device_attr.attr,
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&ipl_wwpn_attr.attr,
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&ipl_lun_attr.attr,
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&ipl_bootprog_attr.attr,
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&ipl_br_lba_attr.attr,
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NULL,
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};
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static struct attribute_group ipl_fcp_attr_group = {
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.attrs = ipl_fcp_attrs,
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};
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static struct attribute *ipl_ccw_attrs[] = {
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&ipl_type_attr.attr,
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&ipl_device_attr.attr,
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NULL,
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};
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static struct attribute_group ipl_ccw_attr_group = {
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.attrs = ipl_ccw_attrs,
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};
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static struct attribute *ipl_unknown_attrs[] = {
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&ipl_type_attr.attr,
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NULL,
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};
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static struct attribute_group ipl_unknown_attr_group = {
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.attrs = ipl_unknown_attrs,
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};
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static ssize_t
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ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
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{
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unsigned int size = IPL_PARMBLOCK_SIZE;
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if (off > size)
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return 0;
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if (off + count > size)
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count = size - off;
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memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
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return count;
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}
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static struct bin_attribute ipl_parameter_attr = {
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.attr = {
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.name = "binary_parameter",
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.mode = S_IRUGO,
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.owner = THIS_MODULE,
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},
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.size = PAGE_SIZE,
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.read = &ipl_parameter_read,
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};
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static ssize_t
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ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
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{
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unsigned int size = IPL_PARMBLOCK_START->fcp.scp_data_len;
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void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
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if (off > size)
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return 0;
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if (off + count > size)
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count = size - off;
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memcpy(buf, scp_data + off, count);
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return count;
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}
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static struct bin_attribute ipl_scp_data_attr = {
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.attr = {
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.name = "scp_data",
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.mode = S_IRUGO,
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.owner = THIS_MODULE,
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},
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.size = PAGE_SIZE,
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.read = &ipl_scp_data_read,
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};
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static decl_subsys(ipl, NULL, NULL);
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static int __init
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ipl_device_sysfs_register(void) {
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int rc;
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rc = firmware_register(&ipl_subsys);
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if (rc)
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return rc;
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switch (get_ipl_type()) {
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case ipl_type_ccw:
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sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
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break;
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case ipl_type_fcp:
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sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
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sysfs_create_bin_file(&ipl_subsys.kset.kobj,
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&ipl_parameter_attr);
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sysfs_create_bin_file(&ipl_subsys.kset.kobj,
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&ipl_scp_data_attr);
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break;
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default:
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sysfs_create_group(&ipl_subsys.kset.kobj,
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&ipl_unknown_attr_group);
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break;
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}
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return 0;
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}
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__initcall(ipl_device_sysfs_register);
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