Commit 15e9b586 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 2254f5a7
......@@ -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
......
......@@ -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();
}
......@@ -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);
......
......@@ -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
......
......@@ -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
......
......@@ -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:
......
......@@ -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:
......
/*
* 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 */
......@@ -1465,41 +1465,6 @@ chsc_get_chp_desc(struct subchannel *sch, int chp_no)
return desc;
}
static int reset_channel_path(struct channel_path *chp)
{
int cc;
cc = rchp(chp->id);
switch (cc) {
case 0:
return 0;
case 2:
return -EBUSY;
default:
return -ENODEV;
}
}
static void reset_channel_paths_css(struct channel_subsystem *css)
{
int i;
for (i = 0; i <= __MAX_CHPID; i++) {
if (css->chps[i])
reset_channel_path(css->chps[i]);
}
}
void cio_reset_channel_paths(void)
{
int i;
for (i = 0; i <= __MAX_CSSID; i++) {
if (css[i] && css[i]->valid)
reset_channel_paths_css(css[i]);
}
}
static int __init
chsc_alloc_sei_area(void)
{
......
......@@ -21,6 +21,7 @@
#include <asm/irq.h>
#include <asm/irq_regs.h>
#include <asm/setup.h>
#include <asm/reset.h>
#include "airq.h"
#include "cio.h"
#include "css.h"
......@@ -28,6 +29,7 @@
#include "ioasm.h"
#include "blacklist.h"
#include "cio_debug.h"
#include "../s390mach.h"
debug_info_t *cio_debug_msg_id;
debug_info_t *cio_debug_trace_id;
......@@ -841,26 +843,12 @@ __clear_subchannel_easy(struct subchannel_id schid)
return -EBUSY;
}
struct sch_match_id {
struct subchannel_id schid;
struct ccw_dev_id devid;
int rc;
};
static int __shutdown_subchannel_easy_and_match(struct subchannel_id schid,
void *data)
static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
{
struct schib schib;
struct sch_match_id *match_id = data;
if (stsch_err(schid, &schib))
return -ENXIO;
if (match_id && schib.pmcw.dnv &&
(schib.pmcw.dev == match_id->devid.devno) &&
(schid.ssid == match_id->devid.ssid)) {
match_id->schid = schid;
match_id->rc = 0;
}
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
......@@ -876,27 +864,111 @@ static int __shutdown_subchannel_easy_and_match(struct subchannel_id schid,
return 0;
}
static int clear_all_subchannels_and_match(struct ccw_dev_id *devid,
struct subchannel_id *schid)
static atomic_t chpid_reset_count;
static void s390_reset_chpids_mcck_handler(void)
{
struct crw crw;
struct mci *mci;
/* Check for pending channel report word. */
mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
if (!mci->cp)
return;
/* Process channel report words. */
while (stcrw(&crw) == 0) {
/* Check for responses to RCHP. */
if (crw.slct && crw.rsc == CRW_RSC_CPATH)
atomic_dec(&chpid_reset_count);
}
}
#define RCHP_TIMEOUT (30 * USEC_PER_SEC)
static void css_reset(void)
{
int i, ret;
unsigned long long timeout;
/* Reset subchannels. */
for_each_subchannel(__shutdown_subchannel_easy, NULL);
/* Reset channel paths. */
s390_reset_mcck_handler = s390_reset_chpids_mcck_handler;
/* Enable channel report machine checks. */
__ctl_set_bit(14, 28);
/* Temporarily reenable machine checks. */
local_mcck_enable();
for (i = 0; i <= __MAX_CHPID; i++) {
ret = rchp(i);
if ((ret == 0) || (ret == 2))
/*
* rchp either succeeded, or another rchp is already
* in progress. In either case, we'll get a crw.
*/
atomic_inc(&chpid_reset_count);
}
/* Wait for machine check for all channel paths. */
timeout = get_clock() + (RCHP_TIMEOUT << 12);
while (atomic_read(&chpid_reset_count) != 0) {
if (get_clock() > timeout)
break;
cpu_relax();
}
/* Disable machine checks again. */
local_mcck_disable();
/* Disable channel report machine checks. */
__ctl_clear_bit(14, 28);
s390_reset_mcck_handler = NULL;
}
static struct reset_call css_reset_call = {
.fn = css_reset,
};
static int __init init_css_reset_call(void)
{
atomic_set(&chpid_reset_count, 0);
register_reset_call(&css_reset_call);
return 0;
}
arch_initcall(init_css_reset_call);
struct sch_match_id {
struct subchannel_id schid;
struct ccw_dev_id devid;
int rc;
};
static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
{
struct schib schib;
struct sch_match_id *match_id = data;
if (stsch_err(schid, &schib))
return -ENXIO;
if (schib.pmcw.dnv &&
(schib.pmcw.dev == match_id->devid.devno) &&
(schid.ssid == match_id->devid.ssid)) {
match_id->schid = schid;
match_id->rc = 0;
return 1;
}
return 0;
}
static int reipl_find_schid(struct ccw_dev_id *devid,
struct subchannel_id *schid)
{
struct sch_match_id match_id;
match_id.devid = *devid;
match_id.rc = -ENODEV;
local_irq_disable();
for_each_subchannel(__shutdown_subchannel_easy_and_match, &match_id);
for_each_subchannel(__reipl_subchannel_match, &match_id);
if (match_id.rc == 0)
*schid = match_id.schid;
return match_id.rc;
}
void clear_all_subchannels(void)
{
local_irq_disable();
for_each_subchannel(__shutdown_subchannel_easy_and_match, NULL);
}
extern void do_reipl_asm(__u32 schid);
/* Make sure all subchannels are quiet before we re-ipl an lpar. */
......@@ -904,9 +976,9 @@ void reipl_ccw_dev(struct ccw_dev_id *devid)
{
struct subchannel_id schid;
if (clear_all_subchannels_and_match(devid, &schid))
s390_reset_system();
if (reipl_find_schid(devid, &schid) != 0)
panic("IPL Device not found\n");
cio_reset_channel_paths();
do_reipl_asm(*((__u32*)&schid));
}
......
......@@ -285,10 +285,6 @@ extern int diag210(struct diag210 *addr);
extern void wait_cons_dev(void);
extern void clear_all_subchannels(void);
extern void cio_reset_channel_paths(void);
extern void css_schedule_reprobe(void);
extern void reipl_ccw_dev(struct ccw_dev_id *id);
......
......@@ -362,6 +362,14 @@ static inline void set_prefix(__u32 address)
asm volatile("spx %0" : : "m" (address) : "memory");
}
static inline __u32 store_prefix(void)
{
__u32 address;
asm volatile("stpx %0" : "=m" (address));
return address;
}
#define __PANIC_MAGIC 0xDEADC0DE
#endif
......
/*
* include/asm-s390/reset.h
*
* Copyright IBM Corp. 2006
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
*/
#ifndef _ASM_S390_RESET_H
#define _ASM_S390_RESET_H
#include <linux/list.h>
struct reset_call {
struct list_head list;
void (*fn)(void);
};
extern void register_reset_call(struct reset_call *reset);
extern void unregister_reset_call(struct reset_call *reset);
extern void s390_reset_system(void);
extern void (*s390_reset_mcck_handler)(void);
#endif /* _ASM_S390_RESET_H */
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