[patch 1/3] s390: improved machine check handling.
From: Heiko Carstens <[email protected]>
Improved machine check handling. Kernel is now able to receive machine
checks while in kernel mode (system call, interrupt and program check
handling). Also register validation is now performed.
Signed-off-by: Martin Schwidefsky <[email protected]>
diffstat:
arch/s390/kernel/entry.S | 102 +++++++++++--
arch/s390/kernel/entry64.S | 97 +++++++++++-
arch/s390/kernel/process.c | 46 +----
arch/s390/kernel/setup.c | 13 +
arch/s390/kernel/smp.c | 13 +
drivers/s390/s390mach.c | 321 ++++++++++++++++++++++++++++++++++++-----
drivers/s390/s390mach.h | 35 +++-
include/asm-s390/lowcore.h | 7
include/asm-s390/processor.h | 52 ++----
include/asm-s390/ptrace.h | 2
include/asm-s390/system.h | 21 +-
include/asm-s390/thread_info.h | 2
12 files changed, 576 insertions(+), 135 deletions(-)
diff -urpN linux-2.6/arch/s390/kernel/entry64.S linux-2.6-patched/arch/s390/kernel/entry64.S
--- linux-2.6/arch/s390/kernel/entry64.S 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/entry64.S 2005-06-23 18:57:54.000000000 +0200
@@ -7,6 +7,7 @@
* Author(s): Martin Schwidefsky ([email protected]),
* Hartmut Penner ([email protected]),
* Denis Joseph Barrow ([email protected],[email protected]),
+ * Heiko Carstens <[email protected]>
*/
#include <linux/sys.h>
@@ -52,9 +53,9 @@ SP_SIZE = STACK_FRAME_OVERHEAD + _
STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE = 1 << STACK_SHIFT
-_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING | \
_TIF_RESTART_SVC | _TIF_SINGLE_STEP )
-_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
+_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
#define BASED(name) name-system_call(%r13)
@@ -114,7 +115,11 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_
jz stack_overflow
3:
#endif
-2: aghi %r15,-SP_SIZE # make room for registers & psw
+2:
+ .endm
+
+ .macro CREATE_STACK_FRAME psworg,savearea
+ aghi %r15,-SP_SIZE # make room for registers & psw
mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
la %r12,\psworg
stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
@@ -152,6 +157,13 @@ __switch_to:
je __switch_to_noper # we got away without bashing TLB's
lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't
__switch_to_noper:
+ lg %r4,__THREAD_info(%r2) # get thread_info of prev
+ tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
+ jz __switch_to_no_mcck
+ ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
+ lg %r4,__THREAD_info(%r3) # get thread_info of next
+ oi __TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
+__switch_to_no_mcck:
stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
@@ -176,6 +188,7 @@ system_call:
sysc_saveall:
SAVE_ALL_BASE __LC_SAVE_AREA
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
sysc_vtime:
@@ -232,6 +245,8 @@ sysc_work_loop:
# One of the work bits is on. Find out which one.
#
sysc_work:
+ tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
+ jo sysc_mcck_pending
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
jo sysc_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
@@ -250,6 +265,13 @@ sysc_reschedule:
jg schedule # return point is sysc_return
#
+# _TIF_MCCK_PENDING is set, call handler
+#
+sysc_mcck_pending:
+ larl %r14,sysc_work_loop
+ jg s390_handle_mcck # TIF bit will be cleared by handler
+
+#
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
@@ -474,6 +496,7 @@ pgm_check_handler:
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
jnz pgm_per # got per exception -> special case
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz pgm_no_vtime
@@ -512,6 +535,7 @@ pgm_per:
#
pgm_per_std:
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz pgm_no_vtime2
@@ -537,6 +561,7 @@ pgm_no_vtime2:
#
pgm_svcper:
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz pgm_no_vtime3
@@ -564,6 +589,7 @@ io_int_handler:
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+32
SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0
+ CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz io_no_vtime
@@ -621,9 +647,11 @@ io_work:
lgr %r15,%r1
#
# One of the work bits is on. Find out which one.
-# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED
+# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED and _TIF_MCCK_PENDING
#
io_work_loop:
+ tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
+ jo io_mcck_pending
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
jo io_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
@@ -631,6 +659,13 @@ io_work_loop:
j io_leave
#
+# _TIF_MCCK_PENDING is set, call handler
+#
+io_mcck_pending:
+ larl %r14,io_work_loop
+ jg s390_handle_mcck # TIF bit will be cleared by handler
+
+#
# _TIF_NEED_RESCHED is set, call schedule
#
io_reschedule:
@@ -661,6 +696,7 @@ ext_int_handler:
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+32
SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0
+ CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz ext_no_vtime
@@ -680,18 +716,60 @@ ext_no_vtime:
*/
.globl mcck_int_handler
mcck_int_handler:
- STORE_TIMER __LC_ASYNC_ENTER_TIMER
+ la %r1,4095 # revalidate r1
+ spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
+ lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
SAVE_ALL_BASE __LC_SAVE_AREA+64
- SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64,0
+ la %r12,__LC_MCK_OLD_PSW
+ tm __LC_MCCK_CODE,0x80 # system damage?
+ jo mcck_int_main # yes -> rest of mcck code invalid
+ tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
+ jo 0f
+ spt __LC_LAST_UPDATE_TIMER
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
- tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_EXIT_TIMER
+0: tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
+ jno mcck_no_vtime # no -> no timer update
+ tm __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
jz mcck_no_vtime
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
mcck_no_vtime:
#endif
- brasl %r14,s390_do_machine_check
+0:
+ tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
+ jno mcck_int_main # no -> skip cleanup critical
+ tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
+ jnz mcck_int_main # from user -> load kernel stack
+ clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
+ jhe mcck_int_main
+ clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
+ jl mcck_int_main
+ brasl %r14,cleanup_critical
+mcck_int_main:
+ lg %r14,__LC_PANIC_STACK # are we already on the panic stack?
+ slgr %r14,%r15
+ srag %r14,%r14,PAGE_SHIFT
+ jz 0f
+ lg %r15,__LC_PANIC_STACK # load panic stack
+0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
+ lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ la %r2,SP_PTREGS(%r15) # load pt_regs
+ brasl %r14,s390_do_machine_check
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+ jno mcck_return
+ lg %r1,__LC_KERNEL_STACK # switch to kernel stack
+ aghi %r1,-SP_SIZE
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
+ xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
+ lgr %r15,%r1
+ stosm __SF_EMPTY(%r15),0x04 # turn dat on
+ tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
+ jno mcck_return
+ brasl %r14,s390_handle_mcck
mcck_return:
RESTORE_ALL 0
@@ -775,7 +853,7 @@ cleanup_critical:
clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop)
jl 0f
clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
- jl cleanup_sysc_leave
+ jl cleanup_sysc_return
0:
br %r14
@@ -793,6 +871,7 @@ cleanup_system_call:
mvc __LC_SAVE_AREA(32),__LC_SAVE_AREA+32
0: stg %r13,__LC_SAVE_AREA+40
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
stg %r15,__LC_SAVE_AREA+56
llgh %r7,__LC_SVC_INT_CODE
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
diff -urpN linux-2.6/arch/s390/kernel/entry.S linux-2.6-patched/arch/s390/kernel/entry.S
--- linux-2.6/arch/s390/kernel/entry.S 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/entry.S 2005-06-23 18:57:54.000000000 +0200
@@ -7,6 +7,7 @@
* Author(s): Martin Schwidefsky ([email protected]),
* Hartmut Penner ([email protected]),
* Denis Joseph Barrow ([email protected],[email protected]),
+ * Heiko Carstens <[email protected]>
*/
#include <linux/sys.h>
@@ -49,9 +50,9 @@ SP_ILC = STACK_FRAME_OVERHEAD + _
SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP
SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
-_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING | \
_TIF_RESTART_SVC | _TIF_SINGLE_STEP )
-_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
+_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE = 1 << STACK_SHIFT
@@ -121,7 +122,11 @@ STACK_SIZE = 1 << STACK_SHIFT
bz BASED(stack_overflow)
3:
#endif
-2: s %r15,BASED(.Lc_spsize) # make room for registers & psw
+2:
+ .endm
+
+ .macro CREATE_STACK_FRAME psworg,savearea
+ s %r15,BASED(.Lc_spsize) # make room for registers & psw
mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
la %r12,\psworg
st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
@@ -161,6 +166,13 @@ __switch_to_base:
be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
__switch_to_noper:
+ l %r4,__THREAD_info(%r2) # get thread_info of prev
+ tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
+ bz __switch_to_no_mcck-__switch_to_base(%r1)
+ ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
+ l %r4,__THREAD_info(%r3) # get thread_info of next
+ oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
+__switch_to_no_mcck:
stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
@@ -185,6 +197,7 @@ system_call:
sysc_saveall:
SAVE_ALL_BASE __LC_SAVE_AREA
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
lh %r7,0x8a # get svc number from lowcore
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
sysc_vtime:
@@ -234,6 +247,8 @@ sysc_work_loop:
# One of the work bits is on. Find out which one.
#
sysc_work:
+ tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
+ bo BASED(sysc_mcck_pending)
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
bo BASED(sysc_reschedule)
tm __TI_flags+3(%r9),_TIF_SIGPENDING
@@ -253,6 +268,14 @@ sysc_reschedule:
br %r1 # call scheduler
#
+# _TIF_MCCK_PENDING is set, call handler
+#
+sysc_mcck_pending:
+ l %r1,BASED(.Ls390_handle_mcck)
+ la %r14,BASED(sysc_work_loop)
+ br %r1 # TIF bit will be cleared by handler
+
+#
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
@@ -430,6 +453,7 @@ pgm_check_handler:
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
bnz BASED(pgm_per) # got per exception -> special case
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
bz BASED(pgm_no_vtime)
@@ -468,6 +492,7 @@ pgm_per:
#
pgm_per_std:
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
bz BASED(pgm_no_vtime2)
@@ -493,6 +518,7 @@ pgm_no_vtime2:
#
pgm_svcper:
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
bz BASED(pgm_no_vtime3)
@@ -521,6 +547,7 @@ io_int_handler:
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+16
SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
+ CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
bz BASED(io_no_vtime)
@@ -578,9 +605,11 @@ io_work:
lr %r15,%r1
#
# One of the work bits is on. Find out which one.
-# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED
+# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED and _TIF_MCCK_PENDING
#
io_work_loop:
+ tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
+ bo BASED(io_mcck_pending)
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
bo BASED(io_reschedule)
tm __TI_flags+3(%r9),_TIF_SIGPENDING
@@ -588,6 +617,14 @@ io_work_loop:
b BASED(io_leave)
#
+# _TIF_MCCK_PENDING is set, call handler
+#
+io_mcck_pending:
+ l %r1,BASED(.Ls390_handle_mcck)
+ l %r14,BASED(io_work_loop)
+ br %r1 # TIF bit will be cleared by handler
+
+#
# _TIF_NEED_RESCHED is set, call schedule
#
io_reschedule:
@@ -621,6 +658,7 @@ ext_int_handler:
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+16
SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
+ CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
bz BASED(ext_no_vtime)
@@ -642,19 +680,62 @@ ext_no_vtime:
.globl mcck_int_handler
mcck_int_handler:
- STORE_TIMER __LC_ASYNC_ENTER_TIMER
+ spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
+ lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
SAVE_ALL_BASE __LC_SAVE_AREA+32
- SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0
+ la %r12,__LC_MCK_OLD_PSW
+ tm __LC_MCCK_CODE,0x80 # system damage?
+ bo BASED(mcck_int_main) # yes -> rest of mcck code invalid
+ tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
+ bo BASED(0f)
+ spt __LC_LAST_UPDATE_TIMER # revalidate cpu timer
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
- tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_EXIT_TIMER
+0: tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
+ bno BASED(mcck_no_vtime) # no -> skip cleanup critical
+ tm __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
bz BASED(mcck_no_vtime)
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
mcck_no_vtime:
#endif
+0:
+ tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
+ bno BASED(mcck_int_main) # no -> skip cleanup critical
+ tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
+ bnz BASED(mcck_int_main) # from user -> load async stack
+ clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
+ bhe BASED(mcck_int_main)
+ clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
+ bl BASED(mcck_int_main)
+ l %r14,BASED(.Lcleanup_critical)
+ basr %r14,%r14
+mcck_int_main:
+ l %r14,__LC_PANIC_STACK # are we already on the panic stack?
+ slr %r14,%r15
+ sra %r14,PAGE_SHIFT
+ be BASED(0f)
+ l %r15,__LC_PANIC_STACK # load panic stack
+0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
+ l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ la %r2,SP_PTREGS(%r15) # load pt_regs
l %r1,BASED(.Ls390_mcck)
- basr %r14,%r1 # call machine check handler
+ basr %r14,%r1 # call machine check handler
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+ bno BASED(mcck_return)
+ l %r1,__LC_KERNEL_STACK # switch to kernel stack
+ s %r1,BASED(.Lc_spsize)
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
+ xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
+ lr %r15,%r1
+ stosm __SF_EMPTY(%r15),0x04 # turn dat on
+ tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
+ bno BASED(mcck_return)
+ l %r1,BASED(.Ls390_handle_mcck)
+ basr %r14,%r1 # call machine check handler
mcck_return:
RESTORE_ALL 0
@@ -742,7 +823,7 @@ cleanup_critical:
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop)
bl BASED(0f)
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
- bl BASED(cleanup_sysc_leave)
+ bl BASED(cleanup_sysc_return)
0:
br %r14
@@ -760,6 +841,7 @@ cleanup_system_call:
mvc __LC_SAVE_AREA(16),__LC_SAVE_AREA+16
0: st %r13,__LC_SAVE_AREA+20
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
st %r15,__LC_SAVE_AREA+28
lh %r7,0x8a
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
@@ -834,6 +916,8 @@ cleanup_sysc_leave_insn:
* Symbol constants
*/
.Ls390_mcck: .long s390_do_machine_check
+.Ls390_handle_mcck:
+ .long s390_handle_mcck
.Ldo_IRQ: .long do_IRQ
.Ldo_extint: .long do_extint
.Ldo_signal: .long do_signal
diff -urpN linux-2.6/arch/s390/kernel/process.c linux-2.6-patched/arch/s390/kernel/process.c
--- linux-2.6/arch/s390/kernel/process.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/process.c 2005-06-23 18:57:54.000000000 +0200
@@ -91,13 +91,12 @@ void do_monitor_call(struct pt_regs *reg
(void *)(long) smp_processor_id());
}
+extern void s390_handle_mcck(void);
/*
* The idle loop on a S390...
*/
void default_idle(void)
{
- psw_t wait_psw;
- unsigned long reg;
int cpu, rc;
local_irq_disable();
@@ -125,38 +124,17 @@ void default_idle(void)
cpu_die();
#endif
- /*
- * Wait for external, I/O or machine check interrupt and
- * switch off machine check bit after the wait has ended.
- */
- wait_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK | PSW_MASK_WAIT |
- PSW_MASK_IO | PSW_MASK_EXT;
-#ifndef CONFIG_ARCH_S390X
- asm volatile (
- " basr %0,0\n"
- "0: la %0,1f-0b(%0)\n"
- " st %0,4(%1)\n"
- " oi 4(%1),0x80\n"
- " lpsw 0(%1)\n"
- "1: la %0,2f-1b(%0)\n"
- " st %0,4(%1)\n"
- " oi 4(%1),0x80\n"
- " ni 1(%1),0xf9\n"
- " lpsw 0(%1)\n"
- "2:"
- : "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
-#else /* CONFIG_ARCH_S390X */
- asm volatile (
- " larl %0,0f\n"
- " stg %0,8(%1)\n"
- " lpswe 0(%1)\n"
- "0: larl %0,1f\n"
- " stg %0,8(%1)\n"
- " ni 1(%1),0xf9\n"
- " lpswe 0(%1)\n"
- "1:"
- : "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
-#endif /* CONFIG_ARCH_S390X */
+ local_mcck_disable();
+ if (test_thread_flag(TIF_MCCK_PENDING)) {
+ local_mcck_enable();
+ local_irq_enable();
+ s390_handle_mcck();
+ return;
+ }
+
+ /* Wait for external, I/O or machine check interrupt. */
+ __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_WAIT |
+ PSW_MASK_IO | PSW_MASK_EXT);
}
void cpu_idle(void)
diff -urpN linux-2.6/arch/s390/kernel/setup.c linux-2.6-patched/arch/s390/kernel/setup.c
--- linux-2.6/arch/s390/kernel/setup.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/setup.c 2005-06-23 18:57:54.000000000 +0200
@@ -414,7 +414,8 @@ setup_lowcore(void)
lc->program_new_psw.mask = PSW_KERNEL_BITS;
lc->program_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
- lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
+ lc->mcck_new_psw.mask =
+ PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
lc->mcck_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
lc->io_new_psw.mask = PSW_KERNEL_BITS;
@@ -424,12 +425,18 @@ setup_lowcore(void)
lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
lc->async_stack = (unsigned long)
__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
-#ifdef CONFIG_CHECK_STACK
lc->panic_stack = (unsigned long)
__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
-#endif
lc->current_task = (unsigned long) init_thread_union.thread_info.task;
lc->thread_info = (unsigned long) &init_thread_union;
+#ifndef CONFIG_ARCH_S390X
+ if (MACHINE_HAS_IEEE) {
+ lc->extended_save_area_addr = (__u32)
+ __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
+ /* enable extended save area */
+ ctl_set_bit(14, 29);
+ }
+#endif
#ifdef CONFIG_ARCH_S390X
if (MACHINE_HAS_DIAG44)
lc->diag44_opcode = 0x83000044;
diff -urpN linux-2.6/arch/s390/kernel/smp.c linux-2.6-patched/arch/s390/kernel/smp.c
--- linux-2.6/arch/s390/kernel/smp.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/smp.c 2005-06-23 18:57:54.000000000 +0200
@@ -771,13 +771,24 @@ void __init smp_prepare_cpus(unsigned in
*(lowcore_ptr[i]) = S390_lowcore;
lowcore_ptr[i]->async_stack = stack + (ASYNC_SIZE);
-#ifdef CONFIG_CHECK_STACK
stack = __get_free_pages(GFP_KERNEL,0);
if (stack == 0ULL)
panic("smp_boot_cpus failed to allocate memory\n");
lowcore_ptr[i]->panic_stack = stack + (PAGE_SIZE);
+#ifndef __s390x__
+ if (MACHINE_HAS_IEEE) {
+ lowcore_ptr[i]->extended_save_area_addr =
+ (__u32) __get_free_pages(GFP_KERNEL,0);
+ if (lowcore_ptr[i]->extended_save_area_addr == 0)
+ panic("smp_boot_cpus failed to "
+ "allocate memory\n");
+ }
#endif
}
+#ifndef __s390x__
+ if (MACHINE_HAS_IEEE)
+ ctl_set_bit(14, 29); /* enable extended save area */
+#endif
set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]);
for_each_cpu(cpu)
diff -urpN linux-2.6/drivers/s390/s390mach.c linux-2.6-patched/drivers/s390/s390mach.c
--- linux-2.6/drivers/s390/s390mach.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/s390mach.c 2005-06-23 18:57:54.000000000 +0200
@@ -31,14 +31,14 @@ extern void css_reiterate_subchannels(vo
extern struct workqueue_struct *slow_path_wq;
extern struct work_struct slow_path_work;
-static void
+static NORET_TYPE void
s390_handle_damage(char *msg)
{
- printk(KERN_EMERG "%s\n", msg);
#ifdef CONFIG_SMP
smp_send_stop();
#endif
disabled_wait((unsigned long) __builtin_return_address(0));
+ for(;;);
}
/*
@@ -122,40 +122,39 @@ 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);
+
/*
- * machine check handler.
+ * Main machine check handler function. Will be called with interrupts enabled
+ * or disabled and machine checks enabled or disabled.
*/
void
-s390_do_machine_check(void)
+s390_handle_mcck(void)
{
- struct mci *mci;
-
- mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
-
- if (mci->sd) /* system damage */
- s390_handle_damage("received system damage machine check\n");
-
- if (mci->pd) /* instruction processing damage */
- s390_handle_damage("received instruction processing "
- "damage machine check\n");
-
- if (mci->se) /* storage error uncorrected */
- s390_handle_damage("received storage error uncorrected "
- "machine check\n");
+ unsigned long flags;
+ struct mcck_struct mcck;
- if (mci->sc) /* storage error corrected */
- printk(KERN_WARNING
- "received storage error corrected machine check\n");
+ /*
+ * 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 (mci->ke) /* storage key-error uncorrected */
- s390_handle_damage("received storage key-error uncorrected "
- "machine check\n");
-
- if (mci->ds && mci->fa) /* storage degradation */
- s390_handle_damage("received storage degradation machine "
- "check\n");
-
- if (mci->cp) /* channel report word pending */
+ if (mcck.channel_report)
up(&m_sem);
#ifdef CONFIG_MACHCHK_WARNING
@@ -168,7 +167,7 @@ s390_do_machine_check(void)
* On VM we only get one interrupt per virtally presented machinecheck.
* Though one suffices, we may get one interrupt per (virtual) processor.
*/
- if (mci->w) { /* WARNING pending ? */
+ if (mcck.warning) { /* WARNING pending ? */
static int mchchk_wng_posted = 0;
/*
* Use single machine clear, as we cannot handle smp right now
@@ -178,6 +177,261 @@ s390_do_machine_check(void)
kill_proc(1, 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);
+ }
+}
+
+/*
+ * 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 __s390x__
+ 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 __s390x__
+ 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));
+ 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 __s390x__
+ 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 __s390x__
+ /*
+ * 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;
+}
+
+/*
+ * machine check handler.
+ */
+void
+s390_do_machine_check(struct pt_regs *regs)
+{
+ struct mci *mci;
+ struct mcck_struct *mcck;
+ int umode;
+
+ 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 __s390x__
+ 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.");
+ }
+ if (!umode)
+ s390_handle_damage("processing backup machine "
+ "check in kernel mode.");
+ mcck->kill_task = 1;
+ mcck->mcck_code = *(unsigned long long *) mci;
+ }
+ 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->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);
+ }
}
/*
@@ -189,9 +443,8 @@ static int
machine_check_init(void)
{
init_MUTEX_LOCKED(&m_sem);
- ctl_clear_bit(14, 25); /* disable damage MCH */
- ctl_set_bit(14, 26); /* enable degradation MCH */
- ctl_set_bit(14, 27); /* enable system recovery MCH */
+ ctl_clear_bit(14, 25); /* disable 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
diff -urpN linux-2.6/drivers/s390/s390mach.h linux-2.6-patched/drivers/s390/s390mach.h
--- linux-2.6/drivers/s390/s390mach.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/s390mach.h 2005-06-23 18:57:54.000000000 +0200
@@ -16,20 +16,45 @@ 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 : 4; /* 03-06 */
+ __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 to_be_defined_2 : 6; /* 10-15 */
+ __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 to_be_defined_3 : 4; /* 20-23 */
+ __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_4 : 7; /* 25-31 */
+ __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 to_be_defined_5 : 31; /* 33-63 */
+ __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 */
};
/*
diff -urpN linux-2.6/include/asm-s390/lowcore.h linux-2.6-patched/include/asm-s390/lowcore.h
--- linux-2.6/include/asm-s390/lowcore.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/lowcore.h 2005-06-23 18:57:54.000000000 +0200
@@ -109,10 +109,14 @@
#ifndef __s390x__
#define __LC_PFAULT_INTPARM 0x080
+#define __LC_CPU_TIMER_SAVE_AREA 0x0D8
#define __LC_AREGS_SAVE_AREA 0x120
+#define __LC_GPREGS_SAVE_AREA 0x180
#define __LC_CREGS_SAVE_AREA 0x1C0
#else /* __s390x__ */
#define __LC_PFAULT_INTPARM 0x11B8
+#define __LC_GPREGS_SAVE_AREA 0x1280
+#define __LC_CPU_TIMER_SAVE_AREA 0x1328
#define __LC_AREGS_SAVE_AREA 0x1340
#define __LC_CREGS_SAVE_AREA 0x1380
#endif /* __s390x__ */
@@ -167,7 +171,8 @@ struct _lowcore
__u16 subchannel_nr; /* 0x0ba */
__u32 io_int_parm; /* 0x0bc */
__u32 io_int_word; /* 0x0c0 */
- __u8 pad3[0xD8-0xC4]; /* 0x0c4 */
+ __u8 pad3[0xD4-0xC4]; /* 0x0c4 */
+ __u32 extended_save_area_addr; /* 0x0d4 */
__u32 cpu_timer_save_area[2]; /* 0x0d8 */
__u32 clock_comp_save_area[2]; /* 0x0e0 */
__u32 mcck_interruption_code[2]; /* 0x0e8 */
diff -urpN linux-2.6/include/asm-s390/processor.h linux-2.6-patched/include/asm-s390/processor.h
--- linux-2.6/include/asm-s390/processor.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/processor.h 2005-06-23 18:57:54.000000000 +0200
@@ -207,6 +207,18 @@ unsigned long get_wchan(struct task_stru
#endif /* __s390x__ */
/*
+ * Set PSW to specified value.
+ */
+static inline void __load_psw(psw_t psw)
+{
+#ifndef __s390x__
+ asm volatile ("lpsw 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
+#else
+ asm volatile ("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
+#endif
+}
+
+/*
* Set PSW mask to specified value, while leaving the
* PSW addr pointing to the next instruction.
*/
@@ -214,8 +226,8 @@ unsigned long get_wchan(struct task_stru
static inline void __load_psw_mask (unsigned long mask)
{
unsigned long addr;
-
psw_t psw;
+
psw.mask = mask;
#ifndef __s390x__
@@ -241,30 +253,8 @@ static inline void __load_psw_mask (unsi
*/
static inline void enabled_wait(void)
{
- unsigned long reg;
- psw_t wait_psw;
-
- wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
- PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY;
-#ifndef __s390x__
- asm volatile (
- " basr %0,0\n"
- "0: la %0,1f-0b(%0)\n"
- " st %0,4(%1)\n"
- " oi 4(%1),0x80\n"
- " lpsw 0(%1)\n"
- "1:"
- : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
- : "memory", "cc" );
-#else /* __s390x__ */
- asm volatile (
- " larl %0,0f\n"
- " stg %0,8(%1)\n"
- " lpswe 0(%1)\n"
- "0:"
- : "=&a" (reg) : "a" (&wait_psw), "m" (wait_psw)
- : "memory", "cc" );
-#endif /* __s390x__ */
+ __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
+ PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY);
}
/*
@@ -273,13 +263,11 @@ static inline void enabled_wait(void)
static inline void disabled_wait(unsigned long code)
{
- char psw_buffer[2*sizeof(psw_t)];
unsigned long ctl_buf;
- psw_t *dw_psw = (psw_t *)(((unsigned long) &psw_buffer+sizeof(psw_t)-1)
- & -sizeof(psw_t));
+ psw_t dw_psw;
- dw_psw->mask = PSW_BASE_BITS | PSW_MASK_WAIT;
- dw_psw->addr = code;
+ dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
+ dw_psw.addr = code;
/*
* Store status and then load disabled wait psw,
* the processor is dead afterwards
@@ -301,7 +289,7 @@ static inline void disabled_wait(unsigne
" oi 0x1c0,0x10\n" /* fake protection bit */
" lpsw 0(%1)"
: "=m" (ctl_buf)
- : "a" (dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
+ : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc" );
#else /* __s390x__ */
asm volatile (" stctg 0,0,0(%2)\n"
" ni 4(%2),0xef\n" /* switch off protection */
@@ -333,7 +321,7 @@ static inline void disabled_wait(unsigne
" oi 0x384(1),0x10\n" /* fake protection bit */
" lpswe 0(%1)"
: "=m" (ctl_buf)
- : "a" (dw_psw), "a" (&ctl_buf),
+ : "a" (&dw_psw), "a" (&ctl_buf),
"m" (dw_psw) : "cc", "0", "1");
#endif /* __s390x__ */
}
diff -urpN linux-2.6/include/asm-s390/ptrace.h linux-2.6-patched/include/asm-s390/ptrace.h
--- linux-2.6/include/asm-s390/ptrace.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/ptrace.h 2005-06-23 18:57:54.000000000 +0200
@@ -276,7 +276,7 @@ typedef struct
#endif /* __s390x__ */
#define PSW_KERNEL_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | \
- PSW_DEFAULT_KEY)
+ PSW_MASK_MCHECK | PSW_DEFAULT_KEY)
#define PSW_USER_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | \
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | \
PSW_MASK_PSTATE | PSW_DEFAULT_KEY)
diff -urpN linux-2.6/include/asm-s390/system.h linux-2.6-patched/include/asm-s390/system.h
--- linux-2.6/include/asm-s390/system.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/system.h 2005-06-23 18:57:54.000000000 +0200
@@ -16,6 +16,7 @@
#include <asm/types.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
+#include <asm/processor.h>
#ifdef __KERNEL__
@@ -331,9 +332,6 @@ __cmpxchg(volatile void *ptr, unsigned l
#ifdef __s390x__
-#define __load_psw(psw) \
- __asm__ __volatile__("lpswe 0(%0)" : : "a" (&psw), "m" (psw) : "cc" );
-
#define __ctl_load(array, low, high) ({ \
typedef struct { char _[sizeof(array)]; } addrtype; \
__asm__ __volatile__ ( \
@@ -390,9 +388,6 @@ __cmpxchg(volatile void *ptr, unsigned l
#else /* __s390x__ */
-#define __load_psw(psw) \
- __asm__ __volatile__("lpsw 0(%0)" : : "a" (&psw) : "cc" );
-
#define __ctl_load(array, low, high) ({ \
typedef struct { char _[sizeof(array)]; } addrtype; \
__asm__ __volatile__ ( \
@@ -451,6 +446,20 @@ __cmpxchg(volatile void *ptr, unsigned l
/* For spinlocks etc */
#define local_irq_save(x) ((x) = local_irq_disable())
+/*
+ * Use to set psw mask except for the first byte which
+ * won't be changed by this function.
+ */
+static inline void
+__set_psw_mask(unsigned long mask)
+{
+ local_save_flags(mask);
+ __load_psw_mask(mask);
+}
+
+#define local_mcck_enable() __set_psw_mask(PSW_KERNEL_BITS)
+#define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK)
+
#ifdef CONFIG_SMP
extern void smp_ctl_set_bit(int cr, int bit);
diff -urpN linux-2.6/include/asm-s390/thread_info.h linux-2.6-patched/include/asm-s390/thread_info.h
--- linux-2.6/include/asm-s390/thread_info.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/thread_info.h 2005-06-23 18:57:54.000000000 +0200
@@ -96,6 +96,7 @@ static inline struct thread_info *curren
#define TIF_RESTART_SVC 4 /* restart svc with new svc number */
#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
+#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
@@ -109,6 +110,7 @@ static inline struct thread_info *curren
#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
+#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT (1<<TIF_31BIT)
-
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