From: Heiko Carstens Export the ipl device settings to userspace via the sysfs: - /sys/kernel/ipl_device Contains a string in on of the following formats: 1) "ccw ", or 2) "fcp ,,". - /sys/kernel/ipl_parameter is a binary interface that exports the ipl parameter block for scsi ipl. For non-scsi ipl the ipl_paramter is irrelevant. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton --- arch/s390/kernel/head.S | 72 ++++++++++++++++++++++++++++++++++++++++++---- arch/s390/kernel/head64.S | 66 ++++++++++++++++++++++++++++++++++++++++-- arch/s390/kernel/setup.c | 67 ++++++++++++++++++++++++++++++++++++++++++ include/asm-s390/setup.h | 44 ++++++++++++++++++++++++++++ 4 files changed, 242 insertions(+), 7 deletions(-) diff -puN arch/s390/kernel/head64.S~s390-ipl-device arch/s390/kernel/head64.S --- devel/arch/s390/kernel/head64.S~s390-ipl-device 2005-09-14 22:13:43.000000000 -0700 +++ devel-akpm/arch/s390/kernel/head64.S 2005-09-14 22:13:43.000000000 -0700 @@ -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 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 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 diff -puN arch/s390/kernel/head.S~s390-ipl-device arch/s390/kernel/head.S --- devel/arch/s390/kernel/head.S~s390-ipl-device 2005-09-14 22:13:43.000000000 -0700 +++ devel-akpm/arch/s390/kernel/head.S 2005-09-14 22:13:43.000000000 -0700 @@ -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 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 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 diff -puN arch/s390/kernel/setup.c~s390-ipl-device arch/s390/kernel/setup.c --- devel/arch/s390/kernel/setup.c~s390-ipl-device 2005-09-14 22:13:43.000000000 -0700 +++ devel-akpm/arch/s390/kernel/setup.c 2005-09-14 22:13:43.000000000 -0700 @@ -682,3 +682,70 @@ struct seq_operations cpuinfo_op = { .show = show_cpuinfo, }; +#ifdef CONFIG_SYSFS + +static ssize_t +ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count) +{ + unsigned int size; + + if (!IPL_PARMBLOCK_VALID) + return 0; + + 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 = "ipl_parameter", + .mode = S_IRUGO, + .owner = THIS_MODULE, + }, + .size = PAGE_SIZE, + .read = &ipl_parameter_read, +}; + +static ssize_t +ipl_device_show(struct subsystem *subsys, char *page) +{ + struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START; + + if (!IPL_DEVNO_VALID) + goto type_unknown; + if (!IPL_PARMBLOCK_VALID) + goto type_ccw; + if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION) + goto type_unknown; + if (ipl->fcp.pbt != IPL_TYPE_FCP) + goto type_unknown; + + return sprintf(page, "fcp 0.0.%04x,0x%016llx,0x%016llx\n", + ipl->fcp.devno, + (unsigned long long) ipl->fcp.wwpn, + (unsigned long long) ipl->fcp.lun); + type_unknown: + return sprintf(page, "unknown\n"); + type_ccw: + return sprintf(page, "ccw 0.0.%04x\n",ipl_devno); +} + +static struct subsys_attribute ipl_device_attr = __ATTR_RO(ipl_device); + +static int __init +ipl_device_sysfs_register(void) { + sysfs_create_file(&kernel_subsys.kset.kobj, &ipl_device_attr.attr); + sysfs_create_bin_file(&kernel_subsys.kset.kobj, &ipl_parameter_attr); + return 0; +} + +__initcall(ipl_device_sysfs_register); + +#endif /* CONFIG_SYSFS */ diff -puN include/asm-s390/setup.h~s390-ipl-device include/asm-s390/setup.h --- devel/include/asm-s390/setup.h~s390-ipl-device 2005-09-14 22:13:43.000000000 -0700 +++ devel-akpm/include/asm-s390/setup.h 2005-09-14 22:13:43.000000000 -0700 @@ -8,11 +8,14 @@ #ifndef _ASM_S390_SETUP_H #define _ASM_S390_SETUP_H +#include + #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 +67,47 @@ 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; +} __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__ _