[PATCH] s390: core changes.

From: Martin Schwidefsky
Date: Wed Jun 30 2004 - 12:12:56 EST

[PATCH] s390: core changes.

From: Arnd Bergmann <arndb@xxxxxxxxxx>
From: Christian Bornträger <cborntra@xxxxxxxxxx>
From: Michael Holzheu <holzheu@xxxxxxxxxx>
From: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

s390 core changes:
- Fix cpu_idle loop if /proc/sys/kernel/hz_timer is set.
- Store correct trap indication on 64 bit for call to do_debugger_trap
in the single stepped svc code.
- Avoid the use of alloca in the debug feature.
- Remove extraneous includes of linux/version.h.
- Regenerate default configuration.
- Mention eServer z890 in Kconfig help text.
- Prevent gcc 3.4 from removing statically defined per cpu variables.

Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

diffstat:
arch/s390/Kconfig | 6 +-
arch/s390/defconfig | 19 +++++--
arch/s390/kernel/debug.c | 120 ++++++++++++++++++++++++---------------------
arch/s390/kernel/entry64.S | 3 -
arch/s390/kernel/time.c | 11 +---
include/asm-s390/debug.h | 1
include/asm-s390/percpu.h | 68 ++++++++++++++++++++-----
include/asm-s390/vtoc.h | 1
8 files changed, 144 insertions(+), 85 deletions(-)

diff -urN linux-2.6/arch/s390/Kconfig linux-2.6-s390/arch/s390/Kconfig
--- linux-2.6/arch/s390/Kconfig Wed Jun 16 07:19:13 2004
+++ linux-2.6-s390/arch/s390/Kconfig Wed Jun 30 17:06:34 2004
@@ -67,9 +67,9 @@
on older 31 bit only CPUs.

config MARCH_Z990
- bool "IBM eServer zSeries model z990"
+ bool "IBM eServer zSeries model z890 and z990"
help
- Select this enable optimizations for model z990.
+ Select this enable optimizations for model z890/z990.
This will be slightly faster but does not work on
older machines such as the z900.

@@ -154,7 +154,7 @@
tristate "QDIO support"
---help---
This driver provides the Queued Direct I/O base support for the
- IBM S/390 (G5 and G6) and eServer zSeries (z800, z900 and z990).
+ IBM S/390 (G5 and G6) and eServer zSeries (z800, z890, z900 and z990).

For details please refer to the documentation provided by IBM at
<http://www10.software.ibm.com/developerworks/opensource/linux390>
diff -urN linux-2.6/arch/s390/defconfig linux-2.6-s390/arch/s390/defconfig
--- linux-2.6/arch/s390/defconfig Wed Jun 30 17:06:11 2004
+++ linux-2.6-s390/arch/s390/defconfig Wed Jun 30 17:06:34 2004
@@ -29,6 +29,7 @@
# CONFIG_EMBEDDED is not set
CONFIG_KALLSYMS=y
# CONFIG_KALLSYMS_ALL is not set
+# CONFIG_KALLSYMS_EXTRA_PASS is not set
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_IOSCHED_NOOP=y
@@ -45,6 +46,7 @@
CONFIG_OBSOLETE_MODPARM=y
# CONFIG_MODVERSIONS is not set
CONFIG_KMOD=y
+CONFIG_STOP_MACHINE=y

#
# Base setup
@@ -84,12 +86,14 @@
# CONFIG_SHARED_KERNEL is not set
# CONFIG_CMM is not set
# CONFIG_VIRT_TIMER is not set
-# CONFIG_NO_IDLE_HZ is not set
+CONFIG_NO_IDLE_HZ=y
+CONFIG_NO_IDLE_HZ_INIT=y
# CONFIG_PCMCIA is not set

#
# Generic Driver Options
#
+CONFIG_PREVENT_FIRMWARE_BUILD=y
# CONFIG_FW_LOADER is not set
# CONFIG_DEBUG_DRIVER is not set

@@ -126,7 +130,6 @@
# SCSI low-level drivers
#
# CONFIG_SCSI_AIC7XXX_OLD is not set
-# CONFIG_SCSI_DPT_I2O is not set
# CONFIG_SCSI_SATA is not set
# CONFIG_SCSI_EATA_PIO is not set
# CONFIG_SCSI_DEBUG is not set
@@ -277,6 +280,7 @@
CONFIG_NET_SCH_GRED=m
CONFIG_NET_SCH_DSMARK=m
# CONFIG_NET_SCH_DELAY is not set
+# CONFIG_NET_SCH_INGRESS is not set
CONFIG_NET_QOS=y
CONFIG_NET_ESTIMATOR=y
CONFIG_NET_CLS=y
@@ -285,8 +289,11 @@
CONFIG_NET_CLS_ROUTE=y
CONFIG_NET_CLS_FW=m
CONFIG_NET_CLS_U32=m
+# CONFIG_CLS_U32_PERF is not set
+# CONFIG_NET_CLS_IND is not set
CONFIG_NET_CLS_RSVP=m
CONFIG_NET_CLS_RSVP6=m
+# CONFIG_NET_CLS_ACT is not set
CONFIG_NET_CLS_POLICE=y

#
@@ -311,7 +318,11 @@
# CONFIG_MII is not set

#
-# Gigabit Ethernet (1000/10000 Mbit)
+# Ethernet (1000 Mbit)
+#
+
+#
+# Ethernet (10000 Mbit)
#

#
@@ -450,7 +461,6 @@
# CONFIG_SOLARIS_X86_PARTITION is not set
# CONFIG_UNIXWARE_DISKLABEL is not set
# CONFIG_LDM_PARTITION is not set
-# CONFIG_NEC98_PARTITION is not set
# CONFIG_SGI_PARTITION is not set
# CONFIG_ULTRIX_PARTITION is not set
# CONFIG_SUN_PARTITION is not set
@@ -509,5 +519,6 @@
#
# Library routines
#
+# CONFIG_CRC16 is not set
# CONFIG_CRC32 is not set
# CONFIG_LIBCRC32C is not set
diff -urN linux-2.6/arch/s390/kernel/debug.c linux-2.6-s390/arch/s390/kernel/debug.c
--- linux-2.6/arch/s390/kernel/debug.c Wed Jun 16 07:18:58 2004
+++ linux-2.6-s390/arch/s390/kernel/debug.c Wed Jun 30 17:06:34 2004
@@ -54,7 +54,7 @@
*
*/
long args[0];
-} debug_sprintf_entry;
+} debug_sprintf_entry_t;


extern void tod_to_timeval(uint64_t todval, struct timeval *xtime);
@@ -88,7 +88,7 @@
int area, debug_entry_t * entry, char *out_buf);

static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
- char *out_buf, debug_sprintf_entry *curr_event);
+ char *out_buf, debug_sprintf_entry_t *curr_event);

/* globals */

@@ -692,31 +692,21 @@
}

/*
- * debug_common:
+ * debug_finish_entry:
* - set timestamp, caller address, cpu number etc.
*/

-extern inline debug_entry_t *debug_common(debug_info_t * id, int level,
- const void *buf, int len, int exception)
+extern inline void debug_finish_entry(debug_info_t * id, debug_entry_t* active,
+ int level, int exception)
{
- unsigned long flags;
- debug_entry_t *active;
-
- spin_lock_irqsave(&id->lock, flags);
- active = get_active_entry(id);
STCK(active->id.stck);
active->id.fields.cpuid = smp_processor_id();
active->caller = __builtin_return_address(0);
active->id.fields.exception = exception;
active->id.fields.level = level;
- memset(DEBUG_DATA(active), 0, id->buf_size);
- memcpy(DEBUG_DATA(active), buf, MIN(len, id->buf_size));
proceed_active_entry(id);
if(exception)
proceed_active_area(id);
- spin_unlock_irqrestore(&id->lock, flags);
-
- return active;
}

/*
@@ -727,7 +717,17 @@
debug_entry_t *debug_event_common(debug_info_t * id, int level, const void *buf,
int len)
{
- return debug_common(id, level, buf, len, 0);
+ unsigned long flags;
+ debug_entry_t *active;
+
+ spin_lock_irqsave(&id->lock, flags);
+ active = get_active_entry(id);
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ memcpy(DEBUG_DATA(active), buf, MIN(len, id->buf_size));
+ debug_finish_entry(id, active, level, 0);
+ spin_unlock_irqrestore(&id->lock, flags);
+
+ return active;
}

/*
@@ -738,7 +738,17 @@
debug_entry_t *debug_exception_common(debug_info_t * id, int level,
const void *buf, int len)
{
- return debug_common(id, level, buf, len, 1);
+ unsigned long flags;
+ debug_entry_t *active;
+
+ spin_lock_irqsave(&id->lock, flags);
+ active = get_active_entry(id);
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ memcpy(DEBUG_DATA(active), buf, MIN(len, id->buf_size));
+ debug_finish_entry(id, active, level, 1);
+ spin_unlock_irqrestore(&id->lock, flags);
+
+ return active;
}

/*
@@ -764,27 +774,28 @@
int level,char *string,...)
{
va_list ap;
- int numargs,alloc_size,idx;
- debug_sprintf_entry *curr_event;
- debug_entry_t *retval = NULL;
+ int numargs,idx;
+ unsigned long flags;
+ debug_sprintf_entry_t *curr_event;
+ debug_entry_t *active;

if((!id) || (level > id->level))
return NULL;
- else {
- numargs=debug_count_numargs(string);
- alloc_size=offsetof(debug_sprintf_entry,args[numargs]);
- curr_event=alloca(alloc_size);
-
- if(curr_event){
- va_start(ap,string);
- curr_event->string=string;
- for(idx=0;idx<numargs;idx++)
- curr_event->args[idx]=va_arg(ap,long);
- retval=debug_common(id,level, curr_event,alloc_size,0);
- va_end(ap);
- }
- return retval;
- }
+
+ numargs=debug_count_numargs(string);
+
+ spin_lock_irqsave(&id->lock, flags);
+ active = get_active_entry(id);
+ curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
+ va_start(ap,string);
+ curr_event->string=string;
+ for(idx=0;idx<MIN(numargs,((id->buf_size / sizeof(long))-1));idx++)
+ curr_event->args[idx]=va_arg(ap,long);
+ va_end(ap);
+ debug_finish_entry(id, active, level, 0);
+ spin_unlock_irqrestore(&id->lock, flags);
+
+ return active;
}

/*
@@ -795,27 +806,28 @@
int level,char *string,...)
{
va_list ap;
- int numargs,alloc_size,idx;
- debug_sprintf_entry *curr_event;
- debug_entry_t *retval = NULL;
+ int numargs,idx;
+ unsigned long flags;
+ debug_sprintf_entry_t *curr_event;
+ debug_entry_t *active;

if((!id) || (level > id->level))
return NULL;
- else {
- numargs=debug_count_numargs(string);
- alloc_size=offsetof(debug_sprintf_entry,args[numargs]);
- curr_event=alloca(alloc_size);
-
- if(curr_event){
- va_start(ap,string);
- curr_event->string=string;
- for(idx=0;idx<numargs;idx++)
- curr_event->args[idx]=va_arg(ap,long);
- retval=debug_common(id,level, curr_event,alloc_size,1);
- va_end(ap);
- }
- return retval;
- }
+
+ numargs=debug_count_numargs(string);
+
+ spin_lock_irqsave(&id->lock, flags);
+ active = get_active_entry(id);
+ curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
+ va_start(ap,string);
+ curr_event->string=string;
+ for(idx=0;idx<MIN(numargs,((id->buf_size / sizeof(long))-1));idx++)
+ curr_event->args[idx]=va_arg(ap,long);
+ va_end(ap);
+ debug_finish_entry(id, active, level, 1);
+ spin_unlock_irqrestore(&id->lock, flags);
+
+ return active;
}

/*
@@ -1127,7 +1139,7 @@
#define DEBUG_SPRINTF_MAX_ARGS 10

int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
- char *out_buf, debug_sprintf_entry *curr_event)
+ char *out_buf, debug_sprintf_entry_t *curr_event)
{
int num_longs, num_used_args = 0,i, rc = 0;
int index[DEBUG_SPRINTF_MAX_ARGS];
diff -urN linux-2.6/arch/s390/kernel/entry64.S linux-2.6-s390/arch/s390/kernel/entry64.S
--- linux-2.6/arch/s390/kernel/entry64.S Wed Jun 16 07:19:01 2004
+++ linux-2.6-s390/arch/s390/kernel/entry64.S Wed Jun 30 17:06:34 2004
@@ -305,7 +305,8 @@
#
sysc_singlestep:
ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
- mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check
+ lhi %r0,__LC_PGM_OLD_PSW
+ sth %r0,SP_TRAP(%r15) # set trap indication to pgm check
la %r2,SP_PTREGS(%r15) # address of register-save area
larl %r14,sysc_return # load adr. of system return
jg do_debugger_trap # branch to do_debugger_trap
diff -urN linux-2.6/arch/s390/kernel/time.c linux-2.6-s390/arch/s390/kernel/time.c
--- linux-2.6/arch/s390/kernel/time.c Wed Jun 16 07:18:38 2004
+++ linux-2.6-s390/arch/s390/kernel/time.c Wed Jun 30 17:06:34 2004
@@ -518,19 +518,19 @@
* Stop the HZ tick on the current CPU.
* Only cpu_idle may call this function.
*/
-int stop_hz_timer(void)
+void stop_hz_timer(void)
{
__u64 timer;

if (sysctl_hz_timer != 0)
- return 1;
+ return;

/*
* Leave the clock comparator set up for the next timer
* tick if either rcu or a softirq is pending.
*/
if (rcu_pending(smp_processor_id()) || local_softirq_pending())
- return 1;
+ return;

/*
* This cpu is going really idle. Set up the clock comparator
@@ -540,8 +540,6 @@
timer = (__u64) (next_timer_interrupt() - jiffies) + jiffies_64;
timer = jiffies_timer_cc + timer * CLK_TICKS_PER_JIFFY;
asm volatile ("SCKC %0" : : "m" (timer));
-
- return 0;
}
#endif

@@ -572,8 +570,7 @@
#endif

#ifdef CONFIG_NO_IDLE_HZ
- if (stop_hz_timer())
- return 1;
+ stop_hz_timer();
#endif

/* enable monitor call class 0 */
diff -urN linux-2.6/include/asm-s390/debug.h linux-2.6-s390/include/asm-s390/debug.h
--- linux-2.6/include/asm-s390/debug.h Wed Jun 16 07:19:23 2004
+++ linux-2.6-s390/include/asm-s390/debug.h Wed Jun 30 17:06:34 2004
@@ -34,7 +34,6 @@
#define __DEBUG_FEATURE_VERSION 1 /* version of debug feature */

#ifdef __KERNEL__
-#include <linux/version.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/time.h>
diff -urN linux-2.6/include/asm-s390/percpu.h linux-2.6-s390/include/asm-s390/percpu.h
--- linux-2.6/include/asm-s390/percpu.h Wed Jun 16 07:20:04 2004
+++ linux-2.6-s390/include/asm-s390/percpu.h Wed Jun 30 17:06:34 2004
@@ -1,30 +1,70 @@
#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__

-#include <asm-generic/percpu.h>
+#include <linux/compiler.h>
#include <asm/lowcore.h>

+#define __GENERIC_PER_CPU
+
/*
- * For builtin kernel code s390 uses the generic implementation for
- * per cpu data, with the exception that the offset of the cpu local
- * data area is cached in the cpu's lowcore memory
+ * s390 uses its own implementation for per cpu data, the offset of
+ * the cpu local data area is cached in the cpu's lowcore memory.
* For 64 bit module code s390 forces the use of a GOT slot for the
* address of the per cpu variable. This is needed because the module
* may be more than 4G above the per cpu area.
*/
#if defined(__s390x__) && defined(MODULE)
-#define __get_got_cpu_var(var,offset) \
+
+#define __reloc_hide(var,offset) \
(*({ unsigned long *__ptr; \
- asm ( "larl %0,per_cpu__"#var"@GOTENT" : "=a" (__ptr) ); \
- ((typeof(&per_cpu__##var))((*__ptr) + offset)); \
- }))
-#undef __get_cpu_var
-#define __get_cpu_var(var) __get_got_cpu_var(var,S390_lowcore.percpu_offset)
-#undef per_cpu
-#define per_cpu(var,cpu) __get_got_cpu_var(var,__per_cpu_offset[cpu])
+ asm ( "larl %0,per_cpu__"#var"@GOTENT" \
+ : "=a" (__ptr) : "X" (per_cpu__##var) ); \
+ (typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
+
#else
-#undef __get_cpu_var
-#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, S390_lowcore.percpu_offset))
+
+#define __reloc_hide(var, offset) \
+ (*({ unsigned long __ptr; \
+ asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
+ (typeof(&per_cpu__##var)) (__ptr + (offset)); }))
+
#endif

+#ifdef CONFIG_SMP
+
+extern unsigned long __per_cpu_offset[NR_CPUS];
+
+/* Separate out the type, so (int[3], foo) works. */
+#define DEFINE_PER_CPU(type, name) \
+ __attribute__((__section__(".data.percpu"))) \
+ __typeof__(type) per_cpu__##name
+
+#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
+#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
+
+/* A macro to avoid #include hell... */
+#define percpu_modcopy(pcpudst, src, size) \
+do { \
+ unsigned int __i; \
+ for (__i = 0; __i < NR_CPUS; __i++) \
+ if (cpu_possible(__i)) \
+ memcpy((pcpudst)+__per_cpu_offset[__i], \
+ (src), (size)); \
+} while (0)
+
+#else /* ! SMP */
+
+#define DEFINE_PER_CPU(type, name) \
+ __typeof__(type) per_cpu__##name
+
+#define __get_cpu_var(var) __reloc_hide(var,0)
+#define per_cpu(var,cpu) __reloc_hide(var,0)
+
+#endif /* SMP */
+
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
+
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+
#endif /* __ARCH_S390_PERCPU__ */
diff -urN linux-2.6/include/asm-s390/vtoc.h linux-2.6-s390/include/asm-s390/vtoc.h
--- linux-2.6/include/asm-s390/vtoc.h Wed Jun 16 07:19:37 2004
+++ linux-2.6-s390/include/asm-s390/vtoc.h Wed Jun 30 17:06:34 2004
@@ -14,7 +14,6 @@
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/hdreg.h>
-#include <linux/version.h>
#include <asm/dasd.h>
#endif

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