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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-03-26 15:24:01 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-26 15:24:10 +0100
commitf5daba1d4116d964435ddd99f32b6c80448a496b (patch)
tree0c4ace40971e9cc455b556a3d5691b64a24044b5 /arch
parent[S390] Fix appldata build break with !NET (diff)
downloadlinux-dev-f5daba1d4116d964435ddd99f32b6c80448a496b.tar.xz
linux-dev-f5daba1d4116d964435ddd99f32b6c80448a496b.zip
[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 <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to '')
-rw-r--r--arch/s390/include/asm/crw.h68
-rw-r--r--arch/s390/include/asm/nmi.h66
-rw-r--r--arch/s390/kernel/Makefile2
-rw-r--r--arch/s390/kernel/nmi.c (renamed from drivers/s390/s390mach.c)246
-rw-r--r--arch/s390/kernel/process.c2
-rw-r--r--arch/s390/kvm/kvm-s390.c4
6 files changed, 183 insertions, 205 deletions
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 <adlung@de.ibm.com>,
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ * Cornelia Huck <cornelia.huck@de.ibm.com>,
+ * Heiko Carstens <heiko.carstens@de.ibm.com>,
+ */
+
+#ifndef _ASM_S390_CRW_H
+#define _ASM_S390_CRW_H
+
+#include <linux/types.h>
+
+/*
+ * 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 <adlung@de.ibm.com>,
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ * Cornelia Huck <cornelia.huck@de.ibm.com>,
+ * Heiko Carstens <heiko.carstens@de.ibm.com>,
+ */
+
+#ifndef _ASM_S390_NMI_H
+#define _ASM_S390_NMI_H
+
+#include <linux/types.h>
+
+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/drivers/s390/s390mach.c b/arch/s390/kernel/nmi.c
index 8e437052e076..8d50eaf76a60 100644
--- a/drivers/s390/s390mach.c
+++ b/arch/s390/kernel/nmi.c
@@ -1,137 +1,23 @@
/*
- * drivers/s390/s390mach.c
- * S/390 machine check handler
+ * Machine check handler
*
- * Copyright IBM Corp. 2000,2008
- * Author(s): Ingo Adlung (adlung@de.ibm.com)
- * Martin Schwidefsky (schwidefsky@de.ibm.com)
- * Cornelia Huck <cornelia.huck@de.ibm.com>
+ * Copyright IBM Corp. 2000,2009
+ * Author(s): Ingo Adlung <adlung@de.ibm.com>,
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ * Cornelia Huck <cornelia.huck@de.ibm.com>,
+ * Heiko Carstens <heiko.carstens@de.ibm.com>,
*/
#include <linux/init.h>
-#include <linux/sched.h>
#include <linux/errno.h>
-#include <linux/workqueue.h>
#include <linux/time.h>
-#include <linux/device.h>
-#include <linux/kthread.h>
-#include <asm/etr.h>
+#include <linux/module.h>
#include <asm/lowcore.h>
-#include <asm/cio.h>
+#include <asm/smp.h>
+#include <asm/etr.h>
#include <asm/cpu.h>
-#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;
-}
+#include <asm/nmi.h>
+#include <asm/crw.h>
struct mcck_struct {
int kill_task;
@@ -142,12 +28,18 @@ struct mcck_struct {
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)
+void s390_handle_mcck(void)
{
unsigned long flags;
struct mcck_struct mcck;
@@ -166,7 +58,7 @@ s390_handle_mcck(void)
local_irq_restore(flags);
if (mcck.channel_report)
- up(&m_sem);
+ crw_handle_channel_report();
#ifdef CONFIG_MACHCHK_WARNING
/*
@@ -204,8 +96,7 @@ 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)
+static int notrace s390_revalidate_registers(struct mci *mci)
{
int kill_task;
u64 tmpclock;
@@ -214,22 +105,21 @@ s390_revalidate_registers(struct mci *mci)
kill_task = 0;
zero = 0;
- /* General purpose registers */
- if (!mci->gr)
+
+ 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)
+ }
+ 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"
@@ -245,9 +135,8 @@ s390_revalidate_registers(struct mci *mci)
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;
+ fpt_creg_save_area = fpt_save_area + 128;
#endif
- /* Floating point control register */
if (!mci->fc) {
/*
* Floating point control register can't be restored.
@@ -278,26 +167,25 @@ s390_revalidate_registers(struct mci *mci)
" 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)
+ if (!mci->ar) {
/*
* Access registers have unknown contents.
* Terminating task.
*/
kill_task = 1;
-
+ }
/* Revalidate control registers */
- if (!mci->cr)
+ if (!mci->cr) {
/*
* Control registers have unknown contents.
* Can't recover and therefore stopping machine.
*/
s390_handle_damage("invalid control registers.");
- else
+ } else {
#ifdef CONFIG_64BIT
asm volatile(
" lctlg 0,15,0(%0)"
@@ -307,12 +195,11 @@ s390_revalidate_registers(struct mci *mci)
" 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
@@ -330,7 +217,6 @@ s390_revalidate_registers(struct mci *mci)
: : "a" (&S390_lowcore.tod_progreg_save_area)
: "0", "cc");
#endif
-
/* Revalidate clock comparator register */
asm volatile(
" stck 0(%1)\n"
@@ -354,31 +240,35 @@ s390_revalidate_registers(struct mci *mci)
#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;
- static int ipd_count;
+ struct mcck_struct *mcck;
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)
+ 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 */
@@ -408,24 +298,17 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
* 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 {
+ } else {
/* Processing damage -> stopping machine */
s390_handle_damage("received instruction processing "
"damage machine check.");
@@ -440,20 +323,18 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
mcck->kill_task = 1;
mcck->mcck_code = *(unsigned long long *) mci;
set_thread_flag(TIF_MCCK_PENDING);
- }
- else
+ } 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))
@@ -465,28 +346,23 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
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;
@@ -495,43 +371,13 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
lockdep_on();
}
-/*
- * s390_init_machine_check
- *
- * initialize machine check handling
- */
-static int
-machine_check_init(void)
+static int __init 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 */
+ 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/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 <asm/processor.h>
#include <asm/irq.h>
#include <asm/timer.h>
+#include <asm/nmi.h>
#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 <linux/timer.h>
#include <asm/lowcore.h>
#include <asm/pgtable.h>
-
+#include <asm/nmi.h>
#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);