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Commit 1e8e3383 authored by Heiko Carstens's avatar Heiko Carstens Committed by Linus Torvalds
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[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ed3cb6f0
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Showing with 367 additions and 7 deletions
arch/s390/kernel/head.S
View file @ 1e8e3383
......@@ -485,7 +485,9 @@ start:
#
.org 0x10000
startup:basr %r13,0 # get base
.LPG1: lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
.LPG1: l %r1, .Lget_ipl_device_addr-.LPG1(%r13)
basr %r14, %r1
lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
la %r12,_pstart-.LPG1(%r13) # pointer to parameter area
# move IPL device to lowcore
mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
......@@ -560,6 +562,9 @@ startup:basr %r13,0 # get base
mr %r2,%r1 # mem size in bytes in %r3
b .Lfchunk-.LPG1(%r13)
.align 4
.Lget_ipl_device_addr:
.long .Lget_ipl_device
.Lpmask:
.byte 0
.align 8
......@@ -755,6 +760,63 @@ _pstart:
.global _pend
_pend:
.Lget_ipl_device:
basr %r12,0
.LPG2: l %r1,0xb8 # get sid
sll %r1,15 # test if subchannel is enabled
srl %r1,31
ltr %r1,%r1
bz 0(%r14) # subchannel disabled
l %r1,0xb8
la %r5,.Lipl_schib-.LPG2(%r12)
stsch 0(%r5) # get schib of subchannel
bnz 0(%r14) # schib not available
tm 5(%r5),0x01 # devno valid?
bno 0(%r14)
la %r6,ipl_parameter_flags-.LPG2(%r12)
oi 3(%r6),0x01 # set flag
la %r2,ipl_devno-.LPG2(%r12)
mvc 0(2,%r2),6(%r5) # store devno
tm 4(%r5),0x80 # qdio capable device?
bno 0(%r14)
oi 3(%r6),0x02 # set flag
# copy ipl parameters
lhi %r0,4096
l %r2,20(%r0) # get address of parameter list
lhi %r3,IPL_PARMBLOCK_ORIGIN
st %r3,20(%r0)
lhi %r4,1
cr %r2,%r3 # start parameters < destination ?
jl 0f
lhi %r1,1 # copy direction is upwards
j 1f
0: lhi %r1,-1 # copy direction is downwards
ar %r2,%r0
ar %r3,%r0
ar %r2,%r1
ar %r3,%r1
1: mvc 0(1,%r3),0(%r2) # finally copy ipl parameters
ar %r3,%r1
ar %r2,%r1
sr %r0,%r4
jne 1b
b 0(%r14)
.align 4
.Lipl_schib:
.rept 13
.long 0
.endr
.globl ipl_parameter_flags
ipl_parameter_flags:
.long 0
.globl ipl_devno
ipl_devno:
.word 0
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif
......@@ -764,11 +826,11 @@ _pend:
#
.globl _stext
_stext: basr %r13,0 # get base
.LPG2:
.LPG3:
#
# Setup stack
#
l %r15,.Linittu-.LPG2(%r13)
l %r15,.Linittu-.LPG3(%r13)
mvc __LC_CURRENT(4),__TI_task(%r15)
ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
st %r15,__LC_KERNEL_STACK # set end of kernel stack
......@@ -782,8 +844,8 @@ _stext: basr %r13,0 # get base
lctl %c0,%c15,0(%r15)
#
lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
l %r14,.Lstart-.LPG2(%r13)
lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
l %r14,.Lstart-.LPG3(%r13)
basr %r14,%r14 # call start_kernel
#
# We returned from start_kernel ?!? PANIK
......
arch/s390/kernel/head64.S
View file @ 1e8e3383
......@@ -484,6 +484,8 @@ start:
startup:basr %r13,0 # get base
.LPG1: sll %r13,1 # remove high order bit
srl %r13,1
l %r1,.Lget_ipl_device_addr-.LPG1(%r13)
basr %r14,%r1
lhi %r1,1 # mode 1 = esame
slr %r0,%r0 # set cpuid to zero
sigp %r1,%r0,0x12 # switch to esame mode
......@@ -556,6 +558,9 @@ startup:basr %r13,0 # get base
mlgr %r2,%r1 # mem size in bytes in %r3
b .Lfchunk-.LPG1(%r13)
.align 4
.Lget_ipl_device_addr:
.long .Lget_ipl_device
.Lpmask:
.byte 0
.align 8
......@@ -746,6 +751,63 @@ _pstart:
.global _pend
_pend:
.Lget_ipl_device:
basr %r12,0
.LPG2: l %r1,0xb8 # get sid
sll %r1,15 # test if subchannel is enabled
srl %r1,31
ltr %r1,%r1
bz 0(%r14) # subchannel disabled
l %r1,0xb8
la %r5,.Lipl_schib-.LPG2(%r12)
stsch 0(%r5) # get schib of subchannel
bnz 0(%r14) # schib not available
tm 5(%r5),0x01 # devno valid?
bno 0(%r14)
la %r6,ipl_parameter_flags-.LPG2(%r12)
oi 3(%r6),0x01 # set flag
la %r2,ipl_devno-.LPG2(%r12)
mvc 0(2,%r2),6(%r5) # store devno
tm 4(%r5),0x80 # qdio capable device?
bno 0(%r14)
oi 3(%r6),0x02 # set flag
# copy ipl parameters
lhi %r0,4096
l %r2,20(%r0) # get address of parameter list
lhi %r3,IPL_PARMBLOCK_ORIGIN
st %r3,20(%r0)
lhi %r4,1
cr %r2,%r3 # start parameters < destination ?
jl 0f
lhi %r1,1 # copy direction is upwards
j 1f
0: lhi %r1,-1 # copy direction is downwards
ar %r2,%r0
ar %r3,%r0
ar %r2,%r1
ar %r3,%r1
1: mvc 0(1,%r3),0(%r2) # finally copy ipl parameters
ar %r3,%r1
ar %r2,%r1
sr %r0,%r4
jne 1b
b 0(%r14)
.align 4
.Lipl_schib:
.rept 13
.long 0
.endr
.globl ipl_parameter_flags
ipl_parameter_flags:
.long 0
.globl ipl_devno
ipl_devno:
.word 0
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif
......@@ -755,7 +817,7 @@ _pend:
#
.globl _stext
_stext: basr %r13,0 # get base
.LPG2:
.LPG3:
#
# Setup stack
#
......@@ -774,7 +836,7 @@ _stext: basr %r13,0 # get base
lctlg %c0,%c15,0(%r15)
#
lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
brasl %r14,start_kernel # go to C code
#
# We returned from start_kernel ?!? PANIK
......
arch/s390/kernel/setup.c
View file @ 1e8e3383
......@@ -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 @@ struct seq_operations cpuinfo_op = {
.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);
include/asm-s390/setup.h
View file @ 1e8e3383
......@@ -8,11 +8,14 @@
#ifndef _ASM_S390_SETUP_H
#define _ASM_S390_SETUP_H
#include <asm/types.h>
#define PARMAREA 0x10400
#define COMMAND_LINE_SIZE 896
#define RAMDISK_ORIGIN 0x800000
#define RAMDISK_SIZE 0x800000
#define MEMORY_CHUNKS 16 /* max 0x7fff */
#define IPL_PARMBLOCK_ORIGIN 0x2000
#ifndef __ASSEMBLY__
......@@ -64,6 +67,53 @@ extern unsigned int console_irq;
#define SET_CONSOLE_3215 do { console_mode = 2; } while (0)
#define SET_CONSOLE_3270 do { console_mode = 3; } while (0)
struct ipl_list_header {
u32 length;
u8 reserved[3];
u8 version;
} __attribute__((packed));
struct ipl_block_fcp {
u32 length;
u8 pbt;
u8 reserved1[322-1];
u16 devno;
u8 reserved2[4];
u64 wwpn;
u64 lun;
u32 bootprog;
u8 reserved3[12];
u64 br_lba;
u32 scp_data_len;
u8 reserved4[260];
u8 scp_data[];
} __attribute__((packed));
struct ipl_parameter_block {
union {
u32 length;
struct ipl_list_header header;
} hdr;
struct ipl_block_fcp fcp;
} __attribute__((packed));
#define IPL_MAX_SUPPORTED_VERSION (0)
#define IPL_TYPE_FCP (0)
/*
* IPL validity flags and parameters as detected in head.S
*/
extern u32 ipl_parameter_flags;
extern u16 ipl_devno;
#define IPL_DEVNO_VALID (ipl_parameter_flags & 1)
#define IPL_PARMBLOCK_VALID (ipl_parameter_flags & 2)
#define IPL_PARMBLOCK_START ((struct ipl_parameter_block *) \
IPL_PARMBLOCK_ORIGIN)
#define IPL_PARMBLOCK_SIZE (IPL_PARMBLOCK_START->hdr.length)
#else
#ifndef __s390x__
......
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