From f67f129e519fa87f8ebd236b6336fe43f31ee141 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Sun, 1 Mar 2009 21:10:49 +0800 Subject: Driver core: implement uevent suppress in kobject This patch implements uevent suppress in kobject and removes it from struct device, based on the following ideas: 1,Uevent sending should be one attribute of kobject, so suppressing it in kobject layer is more natural than in device layer. By this way, we can do it for other objects embedded with kobject. 2,It may save several bytes for each instance of struct device.(On my omap3(32bit ARM) based box, can save 8bytes per device object) This patch also introduces dev_set|get_uevent_suppress() helpers to set and query uevent_suppress attribute in case to help kobject as private part of struct device in future. [This version is against the latest driver-core patch set of Greg,please ignore the last version.] Signed-off-by: Ming Lei Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/css.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/s390/cio/css.c') diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 8019288bc6de..427d11d88069 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -272,7 +272,7 @@ static int css_register_subchannel(struct subchannel *sch) * the subchannel driver can decide itself when it wants to inform * userspace of its existence. */ - sch->dev.uevent_suppress = 1; + dev_set_uevent_suppress(&sch->dev, 1); css_update_ssd_info(sch); /* make it known to the system */ ret = css_sch_device_register(sch); @@ -287,7 +287,7 @@ static int css_register_subchannel(struct subchannel *sch) * a fitting driver module may be loaded based on the * modalias. */ - sch->dev.uevent_suppress = 0; + dev_set_uevent_suppress(&sch->dev, 0); kobject_uevent(&sch->dev.kobj, KOBJ_ADD); } return ret; -- cgit v1.2.3 From f5daba1d4116d964435ddd99f32b6c80448a496b Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Thu, 26 Mar 2009 15:24:01 +0100 Subject: [S390] split/move machine check handler code Split machine check handler code and move it to cio and kernel code where it belongs to. No functional change. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/crw.h | 68 ++++++ arch/s390/include/asm/nmi.h | 66 ++++++ arch/s390/kernel/Makefile | 2 +- arch/s390/kernel/nmi.c | 383 +++++++++++++++++++++++++++++++ arch/s390/kernel/process.c | 2 +- arch/s390/kvm/kvm-s390.c | 4 +- drivers/s390/Makefile | 1 - drivers/s390/cio/Makefile | 2 +- drivers/s390/cio/chp.c | 6 +- drivers/s390/cio/chsc.c | 6 +- drivers/s390/cio/cio.c | 3 +- drivers/s390/cio/crw.c | 145 ++++++++++++ drivers/s390/cio/css.c | 6 +- drivers/s390/s390mach.c | 537 -------------------------------------------- drivers/s390/s390mach.h | 122 ---------- 15 files changed, 677 insertions(+), 676 deletions(-) create mode 100644 arch/s390/include/asm/crw.h create mode 100644 arch/s390/include/asm/nmi.h create mode 100644 arch/s390/kernel/nmi.c create mode 100644 drivers/s390/cio/crw.c delete mode 100644 drivers/s390/s390mach.c delete mode 100644 drivers/s390/s390mach.h (limited to 'drivers/s390/cio/css.c') diff --git a/arch/s390/include/asm/crw.h b/arch/s390/include/asm/crw.h new file mode 100644 index 000000000000..2185a6d619d3 --- /dev/null +++ b/arch/s390/include/asm/crw.h @@ -0,0 +1,68 @@ +/* + * Data definitions for channel report processing + * Copyright IBM Corp. 2000,2009 + * Author(s): Ingo Adlung , + * Martin Schwidefsky , + * Cornelia Huck , + * Heiko Carstens , + */ + +#ifndef _ASM_S390_CRW_H +#define _ASM_S390_CRW_H + +#include + +/* + * Channel Report Word + */ +struct crw { + __u32 res1 : 1; /* reserved zero */ + __u32 slct : 1; /* solicited */ + __u32 oflw : 1; /* overflow */ + __u32 chn : 1; /* chained */ + __u32 rsc : 4; /* reporting source code */ + __u32 anc : 1; /* ancillary report */ + __u32 res2 : 1; /* reserved zero */ + __u32 erc : 6; /* error-recovery code */ + __u32 rsid : 16; /* reporting-source ID */ +} __attribute__ ((packed)); + +typedef void (*crw_handler_t)(struct crw *, struct crw *, int); + +extern int crw_register_handler(int rsc, crw_handler_t handler); +extern void crw_unregister_handler(int rsc); +extern void crw_handle_channel_report(void); + +#define NR_RSCS 16 + +#define CRW_RSC_MONITOR 0x2 /* monitoring facility */ +#define CRW_RSC_SCH 0x3 /* subchannel */ +#define CRW_RSC_CPATH 0x4 /* channel path */ +#define CRW_RSC_CONFIG 0x9 /* configuration-alert facility */ +#define CRW_RSC_CSS 0xB /* channel subsystem */ + +#define CRW_ERC_EVENT 0x00 /* event information pending */ +#define CRW_ERC_AVAIL 0x01 /* available */ +#define CRW_ERC_INIT 0x02 /* initialized */ +#define CRW_ERC_TERROR 0x03 /* temporary error */ +#define CRW_ERC_IPARM 0x04 /* installed parm initialized */ +#define CRW_ERC_TERM 0x05 /* terminal */ +#define CRW_ERC_PERRN 0x06 /* perm. error, fac. not init */ +#define CRW_ERC_PERRI 0x07 /* perm. error, facility init */ +#define CRW_ERC_PMOD 0x08 /* installed parameters modified */ + +static inline int stcrw(struct crw *pcrw) +{ + int ccode; + + asm volatile( + " stcrw 0(%2)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (ccode), "=m" (*pcrw) + : "a" (pcrw) + : "cc" ); + return ccode; +} + +#endif /* _ASM_S390_CRW_H */ diff --git a/arch/s390/include/asm/nmi.h b/arch/s390/include/asm/nmi.h new file mode 100644 index 000000000000..f4b60441adca --- /dev/null +++ b/arch/s390/include/asm/nmi.h @@ -0,0 +1,66 @@ +/* + * Machine check handler definitions + * + * Copyright IBM Corp. 2000,2009 + * Author(s): Ingo Adlung , + * Martin Schwidefsky , + * Cornelia Huck , + * Heiko Carstens , + */ + +#ifndef _ASM_S390_NMI_H +#define _ASM_S390_NMI_H + +#include + +struct mci { + __u32 sd : 1; /* 00 system damage */ + __u32 pd : 1; /* 01 instruction-processing damage */ + __u32 sr : 1; /* 02 system recovery */ + __u32 : 1; /* 03 */ + __u32 cd : 1; /* 04 timing-facility damage */ + __u32 ed : 1; /* 05 external damage */ + __u32 : 1; /* 06 */ + __u32 dg : 1; /* 07 degradation */ + __u32 w : 1; /* 08 warning pending */ + __u32 cp : 1; /* 09 channel-report pending */ + __u32 sp : 1; /* 10 service-processor damage */ + __u32 ck : 1; /* 11 channel-subsystem damage */ + __u32 : 2; /* 12-13 */ + __u32 b : 1; /* 14 backed up */ + __u32 : 1; /* 15 */ + __u32 se : 1; /* 16 storage error uncorrected */ + __u32 sc : 1; /* 17 storage error corrected */ + __u32 ke : 1; /* 18 storage-key error uncorrected */ + __u32 ds : 1; /* 19 storage degradation */ + __u32 wp : 1; /* 20 psw mwp validity */ + __u32 ms : 1; /* 21 psw mask and key validity */ + __u32 pm : 1; /* 22 psw program mask and cc validity */ + __u32 ia : 1; /* 23 psw instruction address validity */ + __u32 fa : 1; /* 24 failing storage address validity */ + __u32 : 1; /* 25 */ + __u32 ec : 1; /* 26 external damage code validity */ + __u32 fp : 1; /* 27 floating point register validity */ + __u32 gr : 1; /* 28 general register validity */ + __u32 cr : 1; /* 29 control register validity */ + __u32 : 1; /* 30 */ + __u32 st : 1; /* 31 storage logical validity */ + __u32 ie : 1; /* 32 indirect storage error */ + __u32 ar : 1; /* 33 access register validity */ + __u32 da : 1; /* 34 delayed access exception */ + __u32 : 7; /* 35-41 */ + __u32 pr : 1; /* 42 tod programmable register validity */ + __u32 fc : 1; /* 43 fp control register validity */ + __u32 ap : 1; /* 44 ancillary report */ + __u32 : 1; /* 45 */ + __u32 ct : 1; /* 46 cpu timer validity */ + __u32 cc : 1; /* 47 clock comparator validity */ + __u32 : 16; /* 47-63 */ +}; + +struct pt_regs; + +extern void s390_handle_mcck(void); +extern void s390_do_machine_check(struct pt_regs *regs); + +#endif /* _ASM_S390_NMI_H */ diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index 33e7aee70513..228e3105ded7 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -22,7 +22,7 @@ CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o \ processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \ s390_ext.o debug.o irq.o ipl.o dis.o diag.o mem_detect.o \ - vdso.o vtime.o sysinfo.o + vdso.o vtime.o sysinfo.o nmi.o obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o) obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o) diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c new file mode 100644 index 000000000000..8d50eaf76a60 --- /dev/null +++ b/arch/s390/kernel/nmi.c @@ -0,0 +1,383 @@ +/* + * Machine check handler + * + * Copyright IBM Corp. 2000,2009 + * Author(s): Ingo Adlung , + * Martin Schwidefsky , + * Cornelia Huck , + * Heiko Carstens , + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct mcck_struct { + int kill_task; + int channel_report; + int warning; + unsigned long long mcck_code; +}; + +static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck); + +static NORET_TYPE void s390_handle_damage(char *msg) +{ + smp_send_stop(); + disabled_wait((unsigned long) __builtin_return_address(0)); + while (1); +} + +/* + * Main machine check handler function. Will be called with interrupts enabled + * or disabled and machine checks enabled or disabled. + */ +void s390_handle_mcck(void) +{ + unsigned long flags; + struct mcck_struct mcck; + + /* + * Disable machine checks and get the current state of accumulated + * machine checks. Afterwards delete the old state and enable machine + * checks again. + */ + local_irq_save(flags); + local_mcck_disable(); + mcck = __get_cpu_var(cpu_mcck); + memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct)); + clear_thread_flag(TIF_MCCK_PENDING); + local_mcck_enable(); + local_irq_restore(flags); + + if (mcck.channel_report) + crw_handle_channel_report(); + +#ifdef CONFIG_MACHCHK_WARNING +/* + * The warning may remain for a prolonged period on the bare iron. + * (actually till the machine is powered off, or until the problem is gone) + * So we just stop listening for the WARNING MCH and prevent continuously + * being interrupted. One caveat is however, that we must do this per + * processor and cannot use the smp version of ctl_clear_bit(). + * On VM we only get one interrupt per virtally presented machinecheck. + * Though one suffices, we may get one interrupt per (virtual) processor. + */ + if (mcck.warning) { /* WARNING pending ? */ + static int mchchk_wng_posted = 0; + /* + * Use single machine clear, as we cannot handle smp right now + */ + __ctl_clear_bit(14, 24); /* Disable WARNING MCH */ + if (xchg(&mchchk_wng_posted, 1) == 0) + kill_cad_pid(SIGPWR, 1); + } +#endif + + if (mcck.kill_task) { + local_irq_enable(); + printk(KERN_EMERG "mcck: Terminating task because of machine " + "malfunction (code 0x%016llx).\n", mcck.mcck_code); + printk(KERN_EMERG "mcck: task: %s, pid: %d.\n", + current->comm, current->pid); + do_exit(SIGSEGV); + } +} +EXPORT_SYMBOL_GPL(s390_handle_mcck); + +/* + * returns 0 if all registers could be validated + * returns 1 otherwise + */ +static int notrace s390_revalidate_registers(struct mci *mci) +{ + int kill_task; + u64 tmpclock; + u64 zero; + void *fpt_save_area, *fpt_creg_save_area; + + kill_task = 0; + zero = 0; + + if (!mci->gr) { + /* + * General purpose registers couldn't be restored and have + * unknown contents. Process needs to be terminated. + */ + kill_task = 1; + } + if (!mci->fp) { + /* + * Floating point registers can't be restored and + * therefore the process needs to be terminated. + */ + kill_task = 1; + } +#ifndef CONFIG_64BIT + asm volatile( + " ld 0,0(%0)\n" + " ld 2,8(%0)\n" + " ld 4,16(%0)\n" + " ld 6,24(%0)" + : : "a" (&S390_lowcore.floating_pt_save_area)); +#endif + + if (MACHINE_HAS_IEEE) { +#ifdef CONFIG_64BIT + fpt_save_area = &S390_lowcore.floating_pt_save_area; + fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area; +#else + fpt_save_area = (void *) S390_lowcore.extended_save_area_addr; + fpt_creg_save_area = fpt_save_area + 128; +#endif + if (!mci->fc) { + /* + * Floating point control register can't be restored. + * Task will be terminated. + */ + asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero)); + kill_task = 1; + + } else + asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area)); + + asm volatile( + " ld 0,0(%0)\n" + " ld 1,8(%0)\n" + " ld 2,16(%0)\n" + " ld 3,24(%0)\n" + " ld 4,32(%0)\n" + " ld 5,40(%0)\n" + " ld 6,48(%0)\n" + " ld 7,56(%0)\n" + " ld 8,64(%0)\n" + " ld 9,72(%0)\n" + " ld 10,80(%0)\n" + " ld 11,88(%0)\n" + " ld 12,96(%0)\n" + " ld 13,104(%0)\n" + " ld 14,112(%0)\n" + " ld 15,120(%0)\n" + : : "a" (fpt_save_area)); + } + /* Revalidate access registers */ + asm volatile( + " lam 0,15,0(%0)" + : : "a" (&S390_lowcore.access_regs_save_area)); + if (!mci->ar) { + /* + * Access registers have unknown contents. + * Terminating task. + */ + kill_task = 1; + } + /* Revalidate control registers */ + if (!mci->cr) { + /* + * Control registers have unknown contents. + * Can't recover and therefore stopping machine. + */ + s390_handle_damage("invalid control registers."); + } else { +#ifdef CONFIG_64BIT + asm volatile( + " lctlg 0,15,0(%0)" + : : "a" (&S390_lowcore.cregs_save_area)); +#else + asm volatile( + " lctl 0,15,0(%0)" + : : "a" (&S390_lowcore.cregs_save_area)); +#endif + } + /* + * We don't even try to revalidate the TOD register, since we simply + * can't write something sensible into that register. + */ +#ifdef CONFIG_64BIT + /* + * See if we can revalidate the TOD programmable register with its + * old contents (should be zero) otherwise set it to zero. + */ + if (!mci->pr) + asm volatile( + " sr 0,0\n" + " sckpf" + : : : "0", "cc"); + else + asm volatile( + " l 0,0(%0)\n" + " sckpf" + : : "a" (&S390_lowcore.tod_progreg_save_area) + : "0", "cc"); +#endif + /* Revalidate clock comparator register */ + asm volatile( + " stck 0(%1)\n" + " sckc 0(%1)" + : "=m" (tmpclock) : "a" (&(tmpclock)) : "cc", "memory"); + + /* Check if old PSW is valid */ + if (!mci->wp) + /* + * Can't tell if we come from user or kernel mode + * -> stopping machine. + */ + s390_handle_damage("old psw invalid."); + + if (!mci->ms || !mci->pm || !mci->ia) + kill_task = 1; + + return kill_task; +} + +#define MAX_IPD_COUNT 29 +#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */ + +#define ED_STP_ISLAND 6 /* External damage STP island check */ +#define ED_STP_SYNC 7 /* External damage STP sync check */ +#define ED_ETR_SYNC 12 /* External damage ETR sync check */ +#define ED_ETR_SWITCH 13 /* External damage ETR switch to local */ + +/* + * machine check handler. + */ +void notrace s390_do_machine_check(struct pt_regs *regs) +{ + static int ipd_count; + static DEFINE_SPINLOCK(ipd_lock); + static unsigned long long last_ipd; + struct mcck_struct *mcck; + unsigned long long tmp; + struct mci *mci; + int umode; + + lockdep_off(); + s390_idle_check(); + + mci = (struct mci *) &S390_lowcore.mcck_interruption_code; + mcck = &__get_cpu_var(cpu_mcck); + umode = user_mode(regs); + + if (mci->sd) { + /* System damage -> stopping machine */ + s390_handle_damage("received system damage machine check."); + } + if (mci->pd) { + if (mci->b) { + /* Processing backup -> verify if we can survive this */ + u64 z_mcic, o_mcic, t_mcic; +#ifdef CONFIG_64BIT + z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29); + o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 | + 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 | + 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 | + 1ULL<<16); +#else + z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<57 | 1ULL<<50 | + 1ULL<<29); + o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 | + 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 | + 1ULL<<30 | 1ULL<<20 | 1ULL<<17 | 1ULL<<16); +#endif + t_mcic = *(u64 *)mci; + + if (((t_mcic & z_mcic) != 0) || + ((t_mcic & o_mcic) != o_mcic)) { + s390_handle_damage("processing backup machine " + "check with damage."); + } + + /* + * Nullifying exigent condition, therefore we might + * retry this instruction. + */ + spin_lock(&ipd_lock); + tmp = get_clock(); + if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME) + ipd_count++; + else + ipd_count = 1; + last_ipd = tmp; + if (ipd_count == MAX_IPD_COUNT) + s390_handle_damage("too many ipd retries."); + spin_unlock(&ipd_lock); + } else { + /* Processing damage -> stopping machine */ + s390_handle_damage("received instruction processing " + "damage machine check."); + } + } + if (s390_revalidate_registers(mci)) { + if (umode) { + /* + * Couldn't restore all register contents while in + * user mode -> mark task for termination. + */ + mcck->kill_task = 1; + mcck->mcck_code = *(unsigned long long *) mci; + set_thread_flag(TIF_MCCK_PENDING); + } else { + /* + * Couldn't restore all register contents while in + * kernel mode -> stopping machine. + */ + s390_handle_damage("unable to revalidate registers."); + } + } + if (mci->cd) { + /* Timing facility damage */ + s390_handle_damage("TOD clock damaged"); + } + if (mci->ed && mci->ec) { + /* External damage */ + if (S390_lowcore.external_damage_code & (1U << ED_ETR_SYNC)) + etr_sync_check(); + if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH)) + etr_switch_to_local(); + if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC)) + stp_sync_check(); + if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND)) + stp_island_check(); + } + if (mci->se) + /* Storage error uncorrected */ + s390_handle_damage("received storage error uncorrected " + "machine check."); + if (mci->ke) + /* Storage key-error uncorrected */ + s390_handle_damage("received storage key-error uncorrected " + "machine check."); + if (mci->ds && mci->fa) + /* Storage degradation */ + s390_handle_damage("received storage degradation machine " + "check."); + if (mci->cp) { + /* Channel report word pending */ + mcck->channel_report = 1; + set_thread_flag(TIF_MCCK_PENDING); + } + if (mci->w) { + /* Warning pending */ + mcck->warning = 1; + set_thread_flag(TIF_MCCK_PENDING); + } + lockdep_on(); +} + +static int __init machine_check_init(void) +{ + ctl_set_bit(14, 25); /* enable external damage MCH */ + ctl_set_bit(14, 27); /* enable system recovery MCH */ +#ifdef CONFIG_MACHCHK_WARNING + ctl_set_bit(14, 24); /* enable warning MCH */ +#endif + return 0; +} +arch_initcall(machine_check_init); diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index e6b480625cb3..bd616fb31e75 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -39,6 +39,7 @@ #include #include #include +#include #include "entry.h" asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); @@ -68,7 +69,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk) return sf->gprs[8]; } -extern void s390_handle_mcck(void); /* * The idle loop on a S390... */ diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index c55a4b9ffd88..caa4d2877016 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -23,7 +23,7 @@ #include #include #include - +#include #include "kvm-s390.h" #include "gaccess.h" @@ -440,8 +440,6 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, return -EINVAL; /* not implemented yet */ } -extern void s390_handle_mcck(void); - static void __vcpu_run(struct kvm_vcpu *vcpu) { memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16); diff --git a/drivers/s390/Makefile b/drivers/s390/Makefile index 0828dc839355..95bccfd3f169 100644 --- a/drivers/s390/Makefile +++ b/drivers/s390/Makefile @@ -2,7 +2,6 @@ # Makefile for the S/390 specific device drivers # -obj-y += s390mach.o obj-y += cio/ block/ char/ crypto/ net/ scsi/ kvm/ drivers-y += drivers/s390/built-in.o diff --git a/drivers/s390/cio/Makefile b/drivers/s390/cio/Makefile index bd79bd165396..adb3dd301528 100644 --- a/drivers/s390/cio/Makefile +++ b/drivers/s390/cio/Makefile @@ -3,7 +3,7 @@ # obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o scsw.o \ - fcx.o itcw.o + fcx.o itcw.o crw.o ccw_device-objs += device.o device_fsm.o device_ops.o ccw_device-objs += device_id.o device_pgid.o device_status.o obj-y += ccw_device.o cmf.o diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c index 1246f61a5338..3e5f304ad88f 100644 --- a/drivers/s390/cio/chp.c +++ b/drivers/s390/cio/chp.c @@ -17,8 +17,8 @@ #include #include #include +#include -#include "../s390mach.h" #include "cio.h" #include "css.h" #include "ioasm.h" @@ -706,12 +706,12 @@ static int __init chp_init(void) struct chp_id chpid; int ret; - ret = s390_register_crw_handler(CRW_RSC_CPATH, chp_process_crw); + ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); if (ret) return ret; chp_wq = create_singlethread_workqueue("cio_chp"); if (!chp_wq) { - s390_unregister_crw_handler(CRW_RSC_CPATH); + crw_unregister_handler(CRW_RSC_CPATH); return -ENOMEM; } INIT_WORK(&cfg_work, cfg_func); diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index ebab6ea4659b..7399b07a1aeb 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -19,8 +19,8 @@ #include #include #include +#include -#include "../s390mach.h" #include "css.h" #include "cio.h" #include "cio_debug.h" @@ -820,7 +820,7 @@ int __init chsc_alloc_sei_area(void) "chsc machine checks!\n"); return -ENOMEM; } - ret = s390_register_crw_handler(CRW_RSC_CSS, chsc_process_crw); + ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw); if (ret) kfree(sei_page); return ret; @@ -828,7 +828,7 @@ int __init chsc_alloc_sei_area(void) void __init chsc_free_sei_area(void) { - s390_unregister_crw_handler(CRW_RSC_CSS); + crw_unregister_handler(CRW_RSC_CSS); kfree(sei_page); } diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 659f8a791656..73135c5e9dfb 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -30,6 +30,8 @@ #include #include #include +#include +#include #include "cio.h" #include "css.h" #include "chsc.h" @@ -38,7 +40,6 @@ #include "blacklist.h" #include "cio_debug.h" #include "chp.h" -#include "../s390mach.h" debug_info_t *cio_debug_msg_id; debug_info_t *cio_debug_trace_id; diff --git a/drivers/s390/cio/crw.c b/drivers/s390/cio/crw.c new file mode 100644 index 000000000000..508f88f6420c --- /dev/null +++ b/drivers/s390/cio/crw.c @@ -0,0 +1,145 @@ +/* + * Channel report handling code + * + * Copyright IBM Corp. 2000,2009 + * Author(s): Ingo Adlung , + * Martin Schwidefsky , + * Cornelia Huck , + * Heiko Carstens , + */ + +#include +#include +#include +#include + +static struct semaphore crw_semaphore; +static crw_handler_t crw_handlers[NR_RSCS]; + +/** + * crw_register_handler() - register a channel report word handler + * @rsc: reporting source code to handle + * @handler: handler to be registered + * + * Returns %0 on success and a negative error value otherwise. + */ +int crw_register_handler(int rsc, crw_handler_t handler) +{ + if ((rsc < 0) || (rsc >= NR_RSCS)) + return -EINVAL; + if (!cmpxchg(&crw_handlers[rsc], NULL, handler)) + return 0; + return -EBUSY; +} + +/** + * crw_unregister_handler() - unregister a channel report word handler + * @rsc: reporting source code to handle + */ +void crw_unregister_handler(int rsc) +{ + if ((rsc < 0) || (rsc >= NR_RSCS)) + return; + xchg(&crw_handlers[rsc], NULL); + synchronize_sched(); +} + +/* + * Retrieve CRWs and call function to handle event. + */ +static int crw_collect_info(void *unused) +{ + struct crw crw[2]; + int ccode; + unsigned int chain; + int ignore; + +repeat: + ignore = down_interruptible(&crw_semaphore); + chain = 0; + while (1) { + if (unlikely(chain > 1)) { + struct crw tmp_crw; + + printk(KERN_WARNING"%s: Code does not support more " + "than two chained crws; please report to " + "linux390@de.ibm.com!\n", __func__); + ccode = stcrw(&tmp_crw); + printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + __func__, tmp_crw.slct, tmp_crw.oflw, + tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc, + tmp_crw.erc, tmp_crw.rsid); + printk(KERN_WARNING"%s: This was crw number %x in the " + "chain\n", __func__, chain); + if (ccode != 0) + break; + chain = tmp_crw.chn ? chain + 1 : 0; + continue; + } + ccode = stcrw(&crw[chain]); + if (ccode != 0) + break; + printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw[chain].slct, crw[chain].oflw, crw[chain].chn, + crw[chain].rsc, crw[chain].anc, crw[chain].erc, + crw[chain].rsid); + /* Check for overflows. */ + if (crw[chain].oflw) { + int i; + + pr_debug("%s: crw overflow detected!\n", __func__); + for (i = 0; i < NR_RSCS; i++) { + if (crw_handlers[i]) + crw_handlers[i](NULL, NULL, 1); + } + chain = 0; + continue; + } + if (crw[0].chn && !chain) { + chain++; + continue; + } + if (crw_handlers[crw[chain].rsc]) + crw_handlers[crw[chain].rsc](&crw[0], + chain ? &crw[1] : NULL, + 0); + /* chain is always 0 or 1 here. */ + chain = crw[chain].chn ? chain + 1 : 0; + } + goto repeat; + return 0; +} + +void crw_handle_channel_report(void) +{ + up(&crw_semaphore); +} + +/* + * Separate initcall needed for semaphore initialization since + * crw_handle_channel_report might be called before crw_machine_check_init. + */ +static int __init crw_init_semaphore(void) +{ + init_MUTEX_LOCKED(&crw_semaphore); + return 0; +} +pure_initcall(crw_init_semaphore); + +/* + * Machine checks for the channel subsystem must be enabled + * after the channel subsystem is initialized + */ +static int __init crw_machine_check_init(void) +{ + struct task_struct *task; + + task = kthread_run(crw_collect_info, NULL, "kmcheck"); + if (IS_ERR(task)) + return PTR_ERR(task); + ctl_set_bit(14, 28); /* enable channel report MCH */ + return 0; +} +device_initcall(crw_machine_check_init); diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 8019288bc6de..a5fc56371ba8 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -18,8 +18,8 @@ #include #include #include +#include -#include "../s390mach.h" #include "css.h" #include "cio.h" #include "cio_debug.h" @@ -765,7 +765,7 @@ init_channel_subsystem (void) if (ret) goto out; - ret = s390_register_crw_handler(CRW_RSC_SCH, css_process_crw); + ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); if (ret) goto out; @@ -845,7 +845,7 @@ out_unregister: out_bus: bus_unregister(&css_bus_type); out: - s390_unregister_crw_handler(CRW_RSC_CSS); + crw_unregister_handler(CRW_RSC_CSS); chsc_free_sei_area(); kfree(slow_subchannel_set); pr_alert("The CSS device driver initialization failed with " diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c deleted file mode 100644 index 8e437052e076..000000000000 --- a/drivers/s390/s390mach.c +++ /dev/null @@ -1,537 +0,0 @@ -/* - * drivers/s390/s390mach.c - * S/390 machine check handler - * - * Copyright IBM Corp. 2000,2008 - * Author(s): Ingo Adlung (adlung@de.ibm.com) - * Martin Schwidefsky (schwidefsky@de.ibm.com) - * Cornelia Huck - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "s390mach.h" - -static struct semaphore m_sem; - -static NORET_TYPE void -s390_handle_damage(char *msg) -{ -#ifdef CONFIG_SMP - smp_send_stop(); -#endif - disabled_wait((unsigned long) __builtin_return_address(0)); - for(;;); -} - -static crw_handler_t crw_handlers[NR_RSCS]; - -/** - * s390_register_crw_handler() - register a channel report word handler - * @rsc: reporting source code to handle - * @handler: handler to be registered - * - * Returns %0 on success and a negative error value otherwise. - */ -int s390_register_crw_handler(int rsc, crw_handler_t handler) -{ - if ((rsc < 0) || (rsc >= NR_RSCS)) - return -EINVAL; - if (!cmpxchg(&crw_handlers[rsc], NULL, handler)) - return 0; - return -EBUSY; -} - -/** - * s390_unregister_crw_handler() - unregister a channel report word handler - * @rsc: reporting source code to handle - */ -void s390_unregister_crw_handler(int rsc) -{ - if ((rsc < 0) || (rsc >= NR_RSCS)) - return; - xchg(&crw_handlers[rsc], NULL); - synchronize_sched(); -} - -/* - * Retrieve CRWs and call function to handle event. - */ -static int s390_collect_crw_info(void *param) -{ - struct crw crw[2]; - int ccode; - struct semaphore *sem; - unsigned int chain; - int ignore; - - sem = (struct semaphore *)param; -repeat: - ignore = down_interruptible(sem); - chain = 0; - while (1) { - if (unlikely(chain > 1)) { - struct crw tmp_crw; - - printk(KERN_WARNING"%s: Code does not support more " - "than two chained crws; please report to " - "linux390@de.ibm.com!\n", __func__); - ccode = stcrw(&tmp_crw); - printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, " - "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", - __func__, tmp_crw.slct, tmp_crw.oflw, - tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc, - tmp_crw.erc, tmp_crw.rsid); - printk(KERN_WARNING"%s: This was crw number %x in the " - "chain\n", __func__, chain); - if (ccode != 0) - break; - chain = tmp_crw.chn ? chain + 1 : 0; - continue; - } - ccode = stcrw(&crw[chain]); - if (ccode != 0) - break; - printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, " - "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", - crw[chain].slct, crw[chain].oflw, crw[chain].chn, - crw[chain].rsc, crw[chain].anc, crw[chain].erc, - crw[chain].rsid); - /* Check for overflows. */ - if (crw[chain].oflw) { - int i; - - pr_debug("%s: crw overflow detected!\n", __func__); - for (i = 0; i < NR_RSCS; i++) { - if (crw_handlers[i]) - crw_handlers[i](NULL, NULL, 1); - } - chain = 0; - continue; - } - if (crw[0].chn && !chain) { - chain++; - continue; - } - if (crw_handlers[crw[chain].rsc]) - crw_handlers[crw[chain].rsc](&crw[0], - chain ? &crw[1] : NULL, - 0); - /* chain is always 0 or 1 here. */ - chain = crw[chain].chn ? chain + 1 : 0; - } - goto repeat; - return 0; -} - -struct mcck_struct { - int kill_task; - int channel_report; - int warning; - unsigned long long mcck_code; -}; - -static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck); - -/* - * Main machine check handler function. Will be called with interrupts enabled - * or disabled and machine checks enabled or disabled. - */ -void -s390_handle_mcck(void) -{ - unsigned long flags; - struct mcck_struct mcck; - - /* - * Disable machine checks and get the current state of accumulated - * machine checks. Afterwards delete the old state and enable machine - * checks again. - */ - local_irq_save(flags); - local_mcck_disable(); - mcck = __get_cpu_var(cpu_mcck); - memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct)); - clear_thread_flag(TIF_MCCK_PENDING); - local_mcck_enable(); - local_irq_restore(flags); - - if (mcck.channel_report) - up(&m_sem); - -#ifdef CONFIG_MACHCHK_WARNING -/* - * The warning may remain for a prolonged period on the bare iron. - * (actually till the machine is powered off, or until the problem is gone) - * So we just stop listening for the WARNING MCH and prevent continuously - * being interrupted. One caveat is however, that we must do this per - * processor and cannot use the smp version of ctl_clear_bit(). - * On VM we only get one interrupt per virtally presented machinecheck. - * Though one suffices, we may get one interrupt per (virtual) processor. - */ - if (mcck.warning) { /* WARNING pending ? */ - static int mchchk_wng_posted = 0; - /* - * Use single machine clear, as we cannot handle smp right now - */ - __ctl_clear_bit(14, 24); /* Disable WARNING MCH */ - if (xchg(&mchchk_wng_posted, 1) == 0) - kill_cad_pid(SIGPWR, 1); - } -#endif - - if (mcck.kill_task) { - local_irq_enable(); - printk(KERN_EMERG "mcck: Terminating task because of machine " - "malfunction (code 0x%016llx).\n", mcck.mcck_code); - printk(KERN_EMERG "mcck: task: %s, pid: %d.\n", - current->comm, current->pid); - do_exit(SIGSEGV); - } -} -EXPORT_SYMBOL_GPL(s390_handle_mcck); - -/* - * returns 0 if all registers could be validated - * returns 1 otherwise - */ -static int -s390_revalidate_registers(struct mci *mci) -{ - int kill_task; - u64 tmpclock; - u64 zero; - void *fpt_save_area, *fpt_creg_save_area; - - kill_task = 0; - zero = 0; - /* General purpose registers */ - if (!mci->gr) - /* - * General purpose registers couldn't be restored and have - * unknown contents. Process needs to be terminated. - */ - kill_task = 1; - - /* Revalidate floating point registers */ - if (!mci->fp) - /* - * Floating point registers can't be restored and - * therefore the process needs to be terminated. - */ - kill_task = 1; - -#ifndef CONFIG_64BIT - asm volatile( - " ld 0,0(%0)\n" - " ld 2,8(%0)\n" - " ld 4,16(%0)\n" - " ld 6,24(%0)" - : : "a" (&S390_lowcore.floating_pt_save_area)); -#endif - - if (MACHINE_HAS_IEEE) { -#ifdef CONFIG_64BIT - fpt_save_area = &S390_lowcore.floating_pt_save_area; - fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area; -#else - fpt_save_area = (void *) S390_lowcore.extended_save_area_addr; - fpt_creg_save_area = fpt_save_area+128; -#endif - /* Floating point control register */ - if (!mci->fc) { - /* - * Floating point control register can't be restored. - * Task will be terminated. - */ - asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero)); - kill_task = 1; - - } else - asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area)); - - asm volatile( - " ld 0,0(%0)\n" - " ld 1,8(%0)\n" - " ld 2,16(%0)\n" - " ld 3,24(%0)\n" - " ld 4,32(%0)\n" - " ld 5,40(%0)\n" - " ld 6,48(%0)\n" - " ld 7,56(%0)\n" - " ld 8,64(%0)\n" - " ld 9,72(%0)\n" - " ld 10,80(%0)\n" - " ld 11,88(%0)\n" - " ld 12,96(%0)\n" - " ld 13,104(%0)\n" - " ld 14,112(%0)\n" - " ld 15,120(%0)\n" - : : "a" (fpt_save_area)); - } - - /* Revalidate access registers */ - asm volatile( - " lam 0,15,0(%0)" - : : "a" (&S390_lowcore.access_regs_save_area)); - if (!mci->ar) - /* - * Access registers have unknown contents. - * Terminating task. - */ - kill_task = 1; - - /* Revalidate control registers */ - if (!mci->cr) - /* - * Control registers have unknown contents. - * Can't recover and therefore stopping machine. - */ - s390_handle_damage("invalid control registers."); - else -#ifdef CONFIG_64BIT - asm volatile( - " lctlg 0,15,0(%0)" - : : "a" (&S390_lowcore.cregs_save_area)); -#else - asm volatile( - " lctl 0,15,0(%0)" - : : "a" (&S390_lowcore.cregs_save_area)); -#endif - - /* - * We don't even try to revalidate the TOD register, since we simply - * can't write something sensible into that register. - */ - -#ifdef CONFIG_64BIT - /* - * See if we can revalidate the TOD programmable register with its - * old contents (should be zero) otherwise set it to zero. - */ - if (!mci->pr) - asm volatile( - " sr 0,0\n" - " sckpf" - : : : "0", "cc"); - else - asm volatile( - " l 0,0(%0)\n" - " sckpf" - : : "a" (&S390_lowcore.tod_progreg_save_area) - : "0", "cc"); -#endif - - /* Revalidate clock comparator register */ - asm volatile( - " stck 0(%1)\n" - " sckc 0(%1)" - : "=m" (tmpclock) : "a" (&(tmpclock)) : "cc", "memory"); - - /* Check if old PSW is valid */ - if (!mci->wp) - /* - * Can't tell if we come from user or kernel mode - * -> stopping machine. - */ - s390_handle_damage("old psw invalid."); - - if (!mci->ms || !mci->pm || !mci->ia) - kill_task = 1; - - return kill_task; -} - -#define MAX_IPD_COUNT 29 -#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */ - -/* - * machine check handler. - */ -void notrace s390_do_machine_check(struct pt_regs *regs) -{ - static DEFINE_SPINLOCK(ipd_lock); - static unsigned long long last_ipd; - static int ipd_count; - unsigned long long tmp; - struct mci *mci; - struct mcck_struct *mcck; - int umode; - - lockdep_off(); - - s390_idle_check(); - - mci = (struct mci *) &S390_lowcore.mcck_interruption_code; - mcck = &__get_cpu_var(cpu_mcck); - umode = user_mode(regs); - - if (mci->sd) - /* System damage -> stopping machine */ - s390_handle_damage("received system damage machine check."); - - if (mci->pd) { - if (mci->b) { - /* Processing backup -> verify if we can survive this */ - u64 z_mcic, o_mcic, t_mcic; -#ifdef CONFIG_64BIT - z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29); - o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 | - 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 | - 1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 | - 1ULL<<16); -#else - z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<57 | 1ULL<<50 | - 1ULL<<29); - o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 | - 1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 | - 1ULL<<30 | 1ULL<<20 | 1ULL<<17 | 1ULL<<16); -#endif - t_mcic = *(u64 *)mci; - - if (((t_mcic & z_mcic) != 0) || - ((t_mcic & o_mcic) != o_mcic)) { - s390_handle_damage("processing backup machine " - "check with damage."); - } - - /* - * Nullifying exigent condition, therefore we might - * retry this instruction. - */ - - spin_lock(&ipd_lock); - - tmp = get_clock(); - - if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME) - ipd_count++; - else - ipd_count = 1; - - last_ipd = tmp; - - if (ipd_count == MAX_IPD_COUNT) - s390_handle_damage("too many ipd retries."); - - spin_unlock(&ipd_lock); - } - else { - /* Processing damage -> stopping machine */ - s390_handle_damage("received instruction processing " - "damage machine check."); - } - } - if (s390_revalidate_registers(mci)) { - if (umode) { - /* - * Couldn't restore all register contents while in - * user mode -> mark task for termination. - */ - mcck->kill_task = 1; - mcck->mcck_code = *(unsigned long long *) mci; - set_thread_flag(TIF_MCCK_PENDING); - } - else - /* - * Couldn't restore all register contents while in - * kernel mode -> stopping machine. - */ - s390_handle_damage("unable to revalidate registers."); - } - - if (mci->cd) { - /* Timing facility damage */ - s390_handle_damage("TOD clock damaged"); - } - - if (mci->ed && mci->ec) { - /* External damage */ - if (S390_lowcore.external_damage_code & (1U << ED_ETR_SYNC)) - etr_sync_check(); - if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH)) - etr_switch_to_local(); - if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC)) - stp_sync_check(); - if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND)) - stp_island_check(); - } - - if (mci->se) - /* Storage error uncorrected */ - s390_handle_damage("received storage error uncorrected " - "machine check."); - - if (mci->ke) - /* Storage key-error uncorrected */ - s390_handle_damage("received storage key-error uncorrected " - "machine check."); - - if (mci->ds && mci->fa) - /* Storage degradation */ - s390_handle_damage("received storage degradation machine " - "check."); - - if (mci->cp) { - /* Channel report word pending */ - mcck->channel_report = 1; - set_thread_flag(TIF_MCCK_PENDING); - } - - if (mci->w) { - /* Warning pending */ - mcck->warning = 1; - set_thread_flag(TIF_MCCK_PENDING); - } - lockdep_on(); -} - -/* - * s390_init_machine_check - * - * initialize machine check handling - */ -static int -machine_check_init(void) -{ - init_MUTEX_LOCKED(&m_sem); - ctl_set_bit(14, 25); /* enable external damage MCH */ - ctl_set_bit(14, 27); /* enable system recovery MCH */ -#ifdef CONFIG_MACHCHK_WARNING - ctl_set_bit(14, 24); /* enable warning MCH */ -#endif - return 0; -} - -/* - * Initialize the machine check handler really early to be able to - * catch all machine checks that happen during boot - */ -arch_initcall(machine_check_init); - -/* - * Machine checks for the channel subsystem must be enabled - * after the channel subsystem is initialized - */ -static int __init -machine_check_crw_init (void) -{ - struct task_struct *task; - - task = kthread_run(s390_collect_crw_info, &m_sem, "kmcheck"); - if (IS_ERR(task)) - return PTR_ERR(task); - ctl_set_bit(14, 28); /* enable channel report MCH */ - return 0; -} - -device_initcall (machine_check_crw_init); diff --git a/drivers/s390/s390mach.h b/drivers/s390/s390mach.h deleted file mode 100644 index d39f8b697d27..000000000000 --- a/drivers/s390/s390mach.h +++ /dev/null @@ -1,122 +0,0 @@ -/* - * drivers/s390/s390mach.h - * S/390 data definitions for machine check processing - * - * S390 version - * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation - * Author(s): Ingo Adlung (adlung@de.ibm.com) - */ - -#ifndef __s390mach_h -#define __s390mach_h - -#include - -struct mci { - __u32 sd : 1; /* 00 system damage */ - __u32 pd : 1; /* 01 instruction-processing damage */ - __u32 sr : 1; /* 02 system recovery */ - __u32 to_be_defined_1 : 1; /* 03 */ - __u32 cd : 1; /* 04 timing-facility damage */ - __u32 ed : 1; /* 05 external damage */ - __u32 to_be_defined_2 : 1; /* 06 */ - __u32 dg : 1; /* 07 degradation */ - __u32 w : 1; /* 08 warning pending */ - __u32 cp : 1; /* 09 channel-report pending */ - __u32 sp : 1; /* 10 service-processor damage */ - __u32 ck : 1; /* 11 channel-subsystem damage */ - __u32 to_be_defined_3 : 2; /* 12-13 */ - __u32 b : 1; /* 14 backed up */ - __u32 to_be_defined_4 : 1; /* 15 */ - __u32 se : 1; /* 16 storage error uncorrected */ - __u32 sc : 1; /* 17 storage error corrected */ - __u32 ke : 1; /* 18 storage-key error uncorrected */ - __u32 ds : 1; /* 19 storage degradation */ - __u32 wp : 1; /* 20 psw mwp validity */ - __u32 ms : 1; /* 21 psw mask and key validity */ - __u32 pm : 1; /* 22 psw program mask and cc validity */ - __u32 ia : 1; /* 23 psw instruction address validity */ - __u32 fa : 1; /* 24 failing storage address validity */ - __u32 to_be_defined_5 : 1; /* 25 */ - __u32 ec : 1; /* 26 external damage code validity */ - __u32 fp : 1; /* 27 floating point register validity */ - __u32 gr : 1; /* 28 general register validity */ - __u32 cr : 1; /* 29 control register validity */ - __u32 to_be_defined_6 : 1; /* 30 */ - __u32 st : 1; /* 31 storage logical validity */ - __u32 ie : 1; /* 32 indirect storage error */ - __u32 ar : 1; /* 33 access register validity */ - __u32 da : 1; /* 34 delayed access exception */ - __u32 to_be_defined_7 : 7; /* 35-41 */ - __u32 pr : 1; /* 42 tod programmable register validity */ - __u32 fc : 1; /* 43 fp control register validity */ - __u32 ap : 1; /* 44 ancillary report */ - __u32 to_be_defined_8 : 1; /* 45 */ - __u32 ct : 1; /* 46 cpu timer validity */ - __u32 cc : 1; /* 47 clock comparator validity */ - __u32 to_be_defined_9 : 16; /* 47-63 */ -}; - -/* - * Channel Report Word - */ -struct crw { - __u32 res1 : 1; /* reserved zero */ - __u32 slct : 1; /* solicited */ - __u32 oflw : 1; /* overflow */ - __u32 chn : 1; /* chained */ - __u32 rsc : 4; /* reporting source code */ - __u32 anc : 1; /* ancillary report */ - __u32 res2 : 1; /* reserved zero */ - __u32 erc : 6; /* error-recovery code */ - __u32 rsid : 16; /* reporting-source ID */ -} __attribute__ ((packed)); - -typedef void (*crw_handler_t)(struct crw *, struct crw *, int); - -extern int s390_register_crw_handler(int rsc, crw_handler_t handler); -extern void s390_unregister_crw_handler(int rsc); - -#define NR_RSCS 16 - -#define CRW_RSC_MONITOR 0x2 /* monitoring facility */ -#define CRW_RSC_SCH 0x3 /* subchannel */ -#define CRW_RSC_CPATH 0x4 /* channel path */ -#define CRW_RSC_CONFIG 0x9 /* configuration-alert facility */ -#define CRW_RSC_CSS 0xB /* channel subsystem */ - -#define CRW_ERC_EVENT 0x00 /* event information pending */ -#define CRW_ERC_AVAIL 0x01 /* available */ -#define CRW_ERC_INIT 0x02 /* initialized */ -#define CRW_ERC_TERROR 0x03 /* temporary error */ -#define CRW_ERC_IPARM 0x04 /* installed parm initialized */ -#define CRW_ERC_TERM 0x05 /* terminal */ -#define CRW_ERC_PERRN 0x06 /* perm. error, fac. not init */ -#define CRW_ERC_PERRI 0x07 /* perm. error, facility init */ -#define CRW_ERC_PMOD 0x08 /* installed parameters modified */ - -static inline int stcrw(struct crw *pcrw ) -{ - int ccode; - - __asm__ __volatile__( - "stcrw 0(%2)\n\t" - "ipm %0\n\t" - "srl %0,28\n\t" - : "=d" (ccode), "=m" (*pcrw) - : "a" (pcrw) - : "cc" ); - return ccode; -} - -#define ED_ETR_SYNC 12 /* External damage ETR sync check */ -#define ED_ETR_SWITCH 13 /* External damage ETR switch to local */ - -#define ED_STP_SYNC 7 /* External damage STP sync check */ -#define ED_STP_ISLAND 6 /* External damage STP island check */ - -struct pt_regs; - -void s390_handle_mcck(void); -void s390_do_machine_check(struct pt_regs *regs); -#endif /* __s390mach */ -- cgit v1.2.3 From 90ac24a5aeb8d4bef001bd3589564a52846d0eee Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Thu, 26 Mar 2009 15:24:11 +0100 Subject: [S390] cio: device scan oom fallback. Since some callers rely on for_each_subchannel_staged to not fail, fall back to brute force scanning using get_subchannel_by_schid in case of a oom situation. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/css.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) (limited to 'drivers/s390/cio/css.c') diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index a5fc56371ba8..1f2e424596af 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -83,6 +83,25 @@ static int call_fn_unknown_sch(struct subchannel_id schid, void *data) return rc; } +static int call_fn_all_sch(struct subchannel_id schid, void *data) +{ + struct cb_data *cb = data; + struct subchannel *sch; + int rc = 0; + + sch = get_subchannel_by_schid(schid); + if (sch) { + if (cb->fn_known_sch) + rc = cb->fn_known_sch(sch, cb->data); + put_device(&sch->dev); + } else { + if (cb->fn_unknown_sch) + rc = cb->fn_unknown_sch(schid, cb->data); + } + + return rc; +} + int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), int (*fn_unknown)(struct subchannel_id, void *), void *data) @@ -90,13 +109,17 @@ int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), struct cb_data cb; int rc; - cb.set = idset_sch_new(); - if (!cb.set) - return -ENOMEM; - idset_fill(cb.set); cb.data = data; cb.fn_known_sch = fn_known; cb.fn_unknown_sch = fn_unknown; + + cb.set = idset_sch_new(); + if (!cb.set) + /* fall back to brute force scanning in case of oom */ + return for_each_subchannel(call_fn_all_sch, &cb); + + idset_fill(cb.set); + /* Process registered subchannels. */ rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); if (rc) -- cgit v1.2.3 From 56e25e9777bf15365293e27a3256eb9214a11edf Mon Sep 17 00:00:00 2001 From: Peter Oberparleiter Date: Thu, 26 Mar 2009 15:24:20 +0100 Subject: [S390] cio: prevent workqueue deadlock Subchannel reprobing can block the kslowcrw workqueue indefinitely while waiting for device recognition to finish which is also scheduled to run on kslowcrw. Prevent this deadlock by moving the waiting portion of subchannel reprobing to the cio workqueue. Signed-off-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/css.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) (limited to 'drivers/s390/cio/css.c') diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 1f2e424596af..8446d15e4485 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -533,6 +533,17 @@ static int reprobe_subchannel(struct subchannel_id schid, void *data) return ret; } +static void reprobe_after_idle(struct work_struct *unused) +{ + /* Make sure initial subchannel scan is done. */ + wait_event(ccw_device_init_wq, + atomic_read(&ccw_device_init_count) == 0); + if (need_reprobe) + css_schedule_reprobe(); +} + +static DECLARE_WORK(reprobe_idle_work, reprobe_after_idle); + /* Work function used to reprobe all unregistered subchannels. */ static void reprobe_all(struct work_struct *unused) { @@ -540,10 +551,12 @@ static void reprobe_all(struct work_struct *unused) CIO_MSG_EVENT(4, "reprobe start\n"); - need_reprobe = 0; /* Make sure initial subchannel scan is done. */ - wait_event(ccw_device_init_wq, - atomic_read(&ccw_device_init_count) == 0); + if (atomic_read(&ccw_device_init_count) != 0) { + queue_work(ccw_device_work, &reprobe_idle_work); + return; + } + need_reprobe = 0; ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL); CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret, -- cgit v1.2.3 From 7b4684880dfc6c45bc56039ca5eada771d7643ab Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Thu, 26 Mar 2009 15:24:42 +0100 Subject: [S390] eliminate cpuinfo_S390 structure Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/lowcore.h | 15 +++++---- arch/s390/include/asm/processor.h | 16 +-------- arch/s390/include/asm/smp.h | 7 +--- arch/s390/kernel/processor.c | 69 +++++++++++++++++++-------------------- arch/s390/kernel/setup.c | 10 ++---- arch/s390/kernel/smp.c | 8 ++--- drivers/s390/cio/css.c | 2 +- 7 files changed, 52 insertions(+), 75 deletions(-) (limited to 'drivers/s390/cio/css.c') diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index f94386ece0d3..ad543c11826d 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -80,7 +80,6 @@ #define __LC_USER_ASCE 0xC50 #define __LC_PANIC_STACK 0xC54 #define __LC_CPUID 0xC60 -#define __LC_CPUADDR 0xC68 #define __LC_IPLDEV 0xC7C #define __LC_CURRENT 0xC90 #define __LC_INT_CLOCK 0xC98 @@ -102,7 +101,6 @@ #define __LC_USER_ASCE 0xD60 #define __LC_PANIC_STACK 0xD68 #define __LC_CPUID 0xD80 -#define __LC_CPUADDR 0xD88 #define __LC_IPLDEV 0xDB8 #define __LC_CURRENT 0xDD8 #define __LC_INT_CLOCK 0xDE8 @@ -273,8 +271,10 @@ struct _lowcore __u32 user_exec_asce; /* 0xc58 */ __u8 pad10[0xc60-0xc5c]; /* 0xc5c */ /* entry.S sensitive area start */ - struct cpuinfo_S390 cpu_data; /* 0xc60 */ - __u32 ipl_device; /* 0xc7c */ + cpuid_t cpu_id; /* 0xc60 */ + __u32 cpu_nr; /* 0xc68 */ + __u32 ipl_device; /* 0xc6c */ + __u8 pad_0xc70[0xc80-0xc70]; /* 0xc70 */ /* entry.S sensitive area end */ /* SMP info area: defined by DJB */ @@ -366,9 +366,10 @@ struct _lowcore __u64 user_exec_asce; /* 0xd70 */ __u8 pad10[0xd80-0xd78]; /* 0xd78 */ /* entry.S sensitive area start */ - struct cpuinfo_S390 cpu_data; /* 0xd80 */ - __u32 ipl_device; /* 0xdb8 */ - __u32 pad11; /* 0xdbc */ + cpuid_t cpu_id; /* 0xd80 */ + __u32 cpu_nr; /* 0xd88 */ + __u32 ipl_device; /* 0xd8c */ + __u8 pad_0xd90[0xdc0-0xd90]; /* 0xd90 */ /* entry.S sensitive area end */ /* SMP info area: defined by DJB */ diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index db4523fe38ac..61862b3ac794 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -42,22 +42,8 @@ static inline void get_cpu_id(cpuid_t *ptr) asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr)); } -struct cpuinfo_S390 -{ - cpuid_t cpu_id; - __u16 cpu_addr; - __u16 cpu_nr; - unsigned long loops_per_jiffy; - unsigned long *pgd_quick; -#ifdef __s390x__ - unsigned long *pmd_quick; -#endif /* __s390x__ */ - unsigned long *pte_quick; - unsigned long pgtable_cache_sz; -}; - extern void s390_adjust_jiffies(void); -extern void print_cpu_info(struct cpuinfo_S390 *); +extern void print_cpu_info(void); extern int get_cpu_capability(unsigned int *); /* diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 024b91e06239..2009158a4502 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -50,12 +50,7 @@ extern void machine_power_off_smp(void); #define PROC_CHANGE_PENALTY 20 /* Schedule penalty */ -#define raw_smp_processor_id() (S390_lowcore.cpu_data.cpu_nr) - -static inline __u16 hard_smp_processor_id(void) -{ - return stap(); -} +#define raw_smp_processor_id() (S390_lowcore.cpu_nr) /* * returns 1 if cpu is in stopped/check stopped state or not operational diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c index 82c1872cfe80..423da1bd42a4 100644 --- a/arch/s390/kernel/processor.c +++ b/arch/s390/kernel/processor.c @@ -18,10 +18,11 @@ #include #include -void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) +void __cpuinit print_cpu_info(void) { pr_info("Processor %d started, address %d, identification %06X\n", - cpuinfo->cpu_nr, cpuinfo->cpu_addr, cpuinfo->cpu_id.ident); + S390_lowcore.cpu_nr, S390_lowcore.cpu_addr, + S390_lowcore.cpu_id.ident); } /* @@ -34,44 +35,42 @@ static int show_cpuinfo(struct seq_file *m, void *v) "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", "edat" }; - struct cpuinfo_S390 *cpuinfo; - unsigned long n = (unsigned long) v - 1; - int i; + struct _lowcore *lc; + unsigned long n = (unsigned long) v - 1; + int i; - s390_adjust_jiffies(); - preempt_disable(); - if (!n) { - seq_printf(m, "vendor_id : IBM/S390\n" - "# processors : %i\n" - "bogomips per cpu: %lu.%02lu\n", - num_online_cpus(), loops_per_jiffy/(500000/HZ), - (loops_per_jiffy/(5000/HZ))%100); - seq_puts(m, "features\t: "); - for (i = 0; i < 8; i++) - if (hwcap_str[i] && (elf_hwcap & (1UL << i))) - seq_printf(m, "%s ", hwcap_str[i]); - seq_puts(m, "\n"); - } + s390_adjust_jiffies(); + preempt_disable(); + if (!n) { + seq_printf(m, "vendor_id : IBM/S390\n" + "# processors : %i\n" + "bogomips per cpu: %lu.%02lu\n", + num_online_cpus(), loops_per_jiffy/(500000/HZ), + (loops_per_jiffy/(5000/HZ))%100); + seq_puts(m, "features\t: "); + for (i = 0; i < 8; i++) + if (hwcap_str[i] && (elf_hwcap & (1UL << i))) + seq_printf(m, "%s ", hwcap_str[i]); + seq_puts(m, "\n"); + } - if (cpu_online(n)) { + if (cpu_online(n)) { #ifdef CONFIG_SMP - if (smp_processor_id() == n) - cpuinfo = &S390_lowcore.cpu_data; - else - cpuinfo = &lowcore_ptr[n]->cpu_data; + lc = (smp_processor_id() == n) ? + &S390_lowcore : lowcore_ptr[n]; #else - cpuinfo = &S390_lowcore.cpu_data; + lc = &S390_lowcore; #endif - seq_printf(m, "processor %li: " - "version = %02X, " - "identification = %06X, " - "machine = %04X\n", - n, cpuinfo->cpu_id.version, - cpuinfo->cpu_id.ident, - cpuinfo->cpu_id.machine); - } - preempt_enable(); - return 0; + seq_printf(m, "processor %li: " + "version = %02X, " + "identification = %06X, " + "machine = %04X\n", + n, lc->cpu_id.version, + lc->cpu_id.ident, + lc->cpu_id.machine); + } + preempt_enable(); + return 0; } static void *c_start(struct seq_file *m, loff_t *pos) diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index dd3c51736270..9c8853f21bb2 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -121,13 +121,10 @@ static struct resource data_resource = { */ void __cpuinit cpu_init(void) { - int addr = hard_smp_processor_id(); - /* * Store processor id in lowcore (used e.g. in timer_interrupt) */ - get_cpu_id(&S390_lowcore.cpu_data.cpu_id); - S390_lowcore.cpu_data.cpu_addr = addr; + get_cpu_id(&S390_lowcore.cpu_id); /* * Force FPU initialization: @@ -686,7 +683,6 @@ setup_memory(void) static void __init setup_hwcaps(void) { static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; - struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; unsigned long long facility_list_extended; unsigned int facility_list; int i; @@ -732,7 +728,7 @@ static void __init setup_hwcaps(void) if (MACHINE_HAS_HPAGE) elf_hwcap |= 1UL << 7; - switch (cpuinfo->cpu_id.machine) { + switch (S390_lowcore.cpu_id.machine) { case 0x9672: #if !defined(CONFIG_64BIT) default: /* Use "g5" as default for 31 bit kernels. */ @@ -825,7 +821,7 @@ setup_arch(char **cmdline_p) setup_lowcore(); cpu_init(); - __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; + __cpu_logical_map[0] = stap(); s390_init_cpu_topology(); /* diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index a8858634dd05..b167f74d94cd 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -372,7 +372,7 @@ static void __init smp_detect_cpus(void) c_cpus = 1; s_cpus = 0; - boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; + boot_cpu_addr = __cpu_logical_map[0]; info = kmalloc(sizeof(*info), GFP_KERNEL); if (!info) panic("smp_detect_cpus failed to allocate memory\n"); @@ -446,7 +446,7 @@ int __cpuinit start_secondary(void *cpuvoid) /* Switch on interrupts */ local_irq_enable(); /* Print info about this processor */ - print_cpu_info(&S390_lowcore.cpu_data); + print_cpu_info(); /* cpu_idle will call schedule for us */ cpu_idle(); return 0; @@ -564,7 +564,7 @@ int __cpuinit __cpu_up(unsigned int cpu) : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; cpu_lowcore->current_task = (unsigned long) idle; - cpu_lowcore->cpu_data.cpu_nr = cpu; + cpu_lowcore->cpu_nr = cpu; cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; cpu_lowcore->ipl_device = S390_lowcore.ipl_device; eieio(); @@ -656,7 +656,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) /* request the 0x1201 emergency signal external interrupt */ if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) panic("Couldn't request external interrupt 0x1201"); - print_cpu_info(&S390_lowcore.cpu_data); + print_cpu_info(); /* Reallocate current lowcore, but keep its contents. */ lc_order = sizeof(long) == 8 ? 1 : 0; diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 8446d15e4485..dcd0e48918da 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -655,7 +655,7 @@ css_generate_pgid(struct channel_subsystem *css, u32 tod_high) css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; } else { #ifdef CONFIG_SMP - css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); + css->global_pgid.pgid_high.cpu_addr = stap(); #else css->global_pgid.pgid_high.cpu_addr = 0; #endif -- cgit v1.2.3