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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2006-12-04 15:40:26 +0100 |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-12-04 15:40:26 +0100 |
commit | 15e9b586e0bd3692e2a21c5be178810d9d32214e (patch) | |
tree | 8bcf2c9b3780281c9562eab965e3ca6ba64e5bc0 /arch/s390 | |
parent | [S390] Some documentation typos. (diff) | |
download | linux-15e9b586e0bd3692e2a21c5be178810d9d32214e.tar.xz linux-15e9b586e0bd3692e2a21c5be178810d9d32214e.zip |
[S390] Reset infrastructure for re-IPL.
In case of re-IPL and diag308 doesn't work we have to reset all devices
manually and wait synchronously that each reset finished.
This patch adds the necessary infrastucture and the first exploiter of it.
Subsystems that need to add a function that needs to be called at re-IPL
may register/unregister this function via
struct reset_call {
struct reset_call *next;
void (*fn)(void);
};
void register_reset_call(struct reset_call *reset);
void unregister_reset_call(struct reset_call *reset);
When the registered function get called the context is:
- all cpus beside the current one are stopped
- all machine checks and interrupts are disabled
- prefixing is disabled
- a default machine check handler is available for use
The registered functions may not take any locks are sleep.
For the common I/O layer part of this patch:
Introduce a reset_call css_reset that does the following:
- clear all subchannels
- perform a rchp on all channel paths and wait for the resulting
machine checks
This replaces the calls to clear_all_subchannels() and
cio_reset_channel_paths() for kexec and ccw reipl. reipl_ccw_dev() now
uses reipl_find_schid() to determine the subchannel id for a given
device id.
Also remove cio_reset_channel_paths() and friends since they are not
needed anymore.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r-- | arch/s390/kernel/Makefile | 2 | ||||
-rw-r--r-- | arch/s390/kernel/ipl.c | 54 | ||||
-rw-r--r-- | arch/s390/kernel/machine_kexec.c | 9 | ||||
-rw-r--r-- | arch/s390/kernel/reipl.S | 17 | ||||
-rw-r--r-- | arch/s390/kernel/reipl64.S | 16 | ||||
-rw-r--r-- | arch/s390/kernel/relocate_kernel.S | 5 | ||||
-rw-r--r-- | arch/s390/kernel/relocate_kernel64.S | 5 | ||||
-rw-r--r-- | arch/s390/kernel/reset.S | 48 |
8 files changed, 115 insertions, 41 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index aa978978d3d1..a81881c9b297 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -4,7 +4,7 @@ EXTRA_AFLAGS := -traditional -obj-y := bitmap.o traps.o time.o process.o \ +obj-y := bitmap.o traps.o time.o process.o reset.o \ setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \ semaphore.o s390_ext.o debug.o profile.o irq.o ipl.o diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index ec127826f221..77f4aff630fe 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -19,6 +19,7 @@ #include <asm/cpcmd.h> #include <asm/cio.h> #include <asm/ebcdic.h> +#include <asm/reset.h> #define IPL_PARM_BLOCK_VERSION 0 #define LOADPARM_LEN 8 @@ -1024,3 +1025,56 @@ static int __init s390_ipl_init(void) } __initcall(s390_ipl_init); + +static LIST_HEAD(rcall); +static DEFINE_MUTEX(rcall_mutex); + +void register_reset_call(struct reset_call *reset) +{ + mutex_lock(&rcall_mutex); + list_add(&reset->list, &rcall); + mutex_unlock(&rcall_mutex); +} +EXPORT_SYMBOL_GPL(register_reset_call); + +void unregister_reset_call(struct reset_call *reset) +{ + mutex_lock(&rcall_mutex); + list_del(&reset->list); + mutex_unlock(&rcall_mutex); +} +EXPORT_SYMBOL_GPL(unregister_reset_call); + +static void do_reset_calls(void) +{ + struct reset_call *reset; + + list_for_each_entry(reset, &rcall, list) + reset->fn(); +} + +extern void reset_mcck_handler(void); + +void s390_reset_system(void) +{ + struct _lowcore *lc; + + /* Disable all interrupts/machine checks */ + __load_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK); + + /* Stack for interrupt/machine check handler */ + lc = (struct _lowcore *)(unsigned long) store_prefix(); + lc->panic_stack = S390_lowcore.panic_stack; + + /* Disable prefixing */ + set_prefix(0); + + /* Disable lowcore protection */ + __ctl_clear_bit(0,28); + + /* Set new machine check handler */ + S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK; + S390_lowcore.mcck_new_psw.addr = + PSW_ADDR_AMODE | (unsigned long) &reset_mcck_handler; + do_reset_calls(); +} diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index 60b1ea9f946b..202bf1fdfe39 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -22,6 +22,7 @@ #include <asm/pgalloc.h> #include <asm/system.h> #include <asm/smp.h> +#include <asm/reset.h> static void kexec_halt_all_cpus(void *); @@ -62,12 +63,6 @@ machine_shutdown(void) NORET_TYPE void machine_kexec(struct kimage *image) { - clear_all_subchannels(); - cio_reset_channel_paths(); - - /* Disable lowcore protection */ - ctl_clear_bit(0,28); - on_each_cpu(kexec_halt_all_cpus, image, 0, 0); for (;;); } @@ -98,6 +93,8 @@ kexec_halt_all_cpus(void *kernel_image) cpu_relax(); } + s390_reset_system(); + image = (struct kimage *) kernel_image; data_mover = (relocate_kernel_t) (page_to_pfn(image->control_code_page) << PAGE_SHIFT); diff --git a/arch/s390/kernel/reipl.S b/arch/s390/kernel/reipl.S index 0340477f3b08..f9434d42ce9f 100644 --- a/arch/s390/kernel/reipl.S +++ b/arch/s390/kernel/reipl.S @@ -11,19 +11,10 @@ .globl do_reipl_asm do_reipl_asm: basr %r13,0 .Lpg0: lpsw .Lnewpsw-.Lpg0(%r13) - - # switch off lowcore protection - -.Lpg1: stctl %c0,%c0,.Lctlsave1-.Lpg0(%r13) - stctl %c0,%c0,.Lctlsave2-.Lpg0(%r13) - ni .Lctlsave1-.Lpg0(%r13),0xef - lctl %c0,%c0,.Lctlsave1-.Lpg0(%r13) - - # do store status of all registers +.Lpg1: # do store status of all registers stm %r0,%r15,__LC_GPREGS_SAVE_AREA stctl %c0,%c15,__LC_CREGS_SAVE_AREA - mvc __LC_CREGS_SAVE_AREA(4),.Lctlsave2-.Lpg0(%r13) stam %a0,%a15,__LC_AREGS_SAVE_AREA stpx __LC_PREFIX_SAVE_AREA stckc .Lclkcmp-.Lpg0(%r13) @@ -56,8 +47,7 @@ do_reipl_asm: basr %r13,0 .L002: tm .Liplirb+8-.Lpg0(%r13),0xf3 jz .L003 bas %r14,.Ldisab-.Lpg0(%r13) -.L003: spx .Lnull-.Lpg0(%r13) - st %r1,__LC_SUBCHANNEL_ID +.L003: st %r1,__LC_SUBCHANNEL_ID lpsw 0 sigp 0,0,0(6) .Ldisab: st %r14,.Ldispsw+4-.Lpg0(%r13) @@ -65,9 +55,6 @@ do_reipl_asm: basr %r13,0 .align 8 .Lclkcmp: .quad 0x0000000000000000 .Lall: .long 0xff000000 -.Lnull: .long 0x00000000 -.Lctlsave1: .long 0x00000000 -.Lctlsave2: .long 0x00000000 .align 8 .Lnewpsw: .long 0x00080000,0x80000000+.Lpg1 .Lpcnew: .long 0x00080000,0x80000000+.Lecs diff --git a/arch/s390/kernel/reipl64.S b/arch/s390/kernel/reipl64.S index de7435054f7c..f18ef260ca23 100644 --- a/arch/s390/kernel/reipl64.S +++ b/arch/s390/kernel/reipl64.S @@ -10,10 +10,10 @@ #include <asm/lowcore.h> .globl do_reipl_asm do_reipl_asm: basr %r13,0 +.Lpg0: lpswe .Lnewpsw-.Lpg0(%r13) +.Lpg1: # do store status of all registers - # do store status of all registers - -.Lpg0: stg %r1,.Lregsave-.Lpg0(%r13) + stg %r1,.Lregsave-.Lpg0(%r13) lghi %r1,0x1000 stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-0x1000(%r1) lg %r0,.Lregsave-.Lpg0(%r13) @@ -27,11 +27,7 @@ do_reipl_asm: basr %r13,0 stpt __LC_CPU_TIMER_SAVE_AREA-0x1000(%r1) stg %r13, __LC_PSW_SAVE_AREA-0x1000+8(%r1) - lpswe .Lnewpsw-.Lpg0(%r13) -.Lpg1: lctlg %c6,%c6,.Lall-.Lpg0(%r13) - stctg %c0,%c0,.Lregsave-.Lpg0(%r13) - ni .Lregsave+4-.Lpg0(%r13),0xef - lctlg %c0,%c0,.Lregsave-.Lpg0(%r13) + lctlg %c6,%c6,.Lall-.Lpg0(%r13) lgr %r1,%r2 mvc __LC_PGM_NEW_PSW(16),.Lpcnew-.Lpg0(%r13) stsch .Lschib-.Lpg0(%r13) @@ -56,8 +52,7 @@ do_reipl_asm: basr %r13,0 .L002: tm .Liplirb+8-.Lpg0(%r13),0xf3 jz .L003 bas %r14,.Ldisab-.Lpg0(%r13) -.L003: spx .Lnull-.Lpg0(%r13) - st %r1,__LC_SUBCHANNEL_ID +.L003: st %r1,__LC_SUBCHANNEL_ID lhi %r1,0 # mode 0 = esa slr %r0,%r0 # set cpuid to zero sigp %r1,%r0,0x12 # switch to esa mode @@ -70,7 +65,6 @@ do_reipl_asm: basr %r13,0 .Lclkcmp: .quad 0x0000000000000000 .Lall: .quad 0x00000000ff000000 .Lregsave: .quad 0x0000000000000000 -.Lnull: .long 0x0000000000000000 .align 16 /* * These addresses have to be 31 bit otherwise diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S index f9899ff2e5b0..3b456b80bcee 100644 --- a/arch/s390/kernel/relocate_kernel.S +++ b/arch/s390/kernel/relocate_kernel.S @@ -26,8 +26,7 @@ relocate_kernel: basr %r13,0 # base address .base: - stnsm sys_msk-.base(%r13),0xf8 # disable DAT and IRQ (external) - spx zero64-.base(%r13) # absolute addressing mode + stnsm sys_msk-.base(%r13),0xfb # disable DAT stctl %c0,%c15,ctlregs-.base(%r13) stm %r0,%r15,gprregs-.base(%r13) la %r1,load_psw-.base(%r13) @@ -97,8 +96,6 @@ lpsw 0 # hopefully start new kernel... .align 8 - zero64: - .quad 0 load_psw: .long 0x00080000,0x80000000 sys_msk: diff --git a/arch/s390/kernel/relocate_kernel64.S b/arch/s390/kernel/relocate_kernel64.S index 4fb443042d9c..1f9ea2067b59 100644 --- a/arch/s390/kernel/relocate_kernel64.S +++ b/arch/s390/kernel/relocate_kernel64.S @@ -27,8 +27,7 @@ relocate_kernel: basr %r13,0 # base address .base: - stnsm sys_msk-.base(%r13),0xf8 # disable DAT and IRQs - spx zero64-.base(%r13) # absolute addressing mode + stnsm sys_msk-.base(%r13),0xfb # disable DAT stctg %c0,%c15,ctlregs-.base(%r13) stmg %r0,%r15,gprregs-.base(%r13) lghi %r0,3 @@ -100,8 +99,6 @@ lpsw 0 # hopefully start new kernel... .align 8 - zero64: - .quad 0 load_psw: .long 0x00080000,0x80000000 sys_msk: diff --git a/arch/s390/kernel/reset.S b/arch/s390/kernel/reset.S new file mode 100644 index 000000000000..be8688c0665c --- /dev/null +++ b/arch/s390/kernel/reset.S @@ -0,0 +1,48 @@ +/* + * arch/s390/kernel/reset.S + * + * Copyright (C) IBM Corp. 2006 + * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> + */ + +#include <asm/ptrace.h> +#include <asm/lowcore.h> + +#ifdef CONFIG_64BIT + + .globl reset_mcck_handler +reset_mcck_handler: + basr %r13,0 +0: lg %r15,__LC_PANIC_STACK # load panic stack + aghi %r15,-STACK_FRAME_OVERHEAD + lg %r1,s390_reset_mcck_handler-0b(%r13) + ltgr %r1,%r1 + jz 1f + basr %r14,%r1 +1: la %r1,4095 + lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1) + lpswe __LC_MCK_OLD_PSW + + .globl s390_reset_mcck_handler +s390_reset_mcck_handler: + .quad 0 + +#else /* CONFIG_64BIT */ + + .globl reset_mcck_handler +reset_mcck_handler: + basr %r13,0 +0: l %r15,__LC_PANIC_STACK # load panic stack + ahi %r15,-STACK_FRAME_OVERHEAD + l %r1,s390_reset_mcck_handler-0b(%r13) + ltr %r1,%r1 + jz 1f + basr %r14,%r1 +1: lm %r0,%r15,__LC_GPREGS_SAVE_AREA + lpsw __LC_MCK_OLD_PSW + + .globl s390_reset_mcck_handler +s390_reset_mcck_handler: + .long 0 + +#endif /* CONFIG_64BIT */ |