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Subject[patch 13/32] [PATCH] add MACHINE_IS_LPAR flag
From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Introduce the MACHINE_IS_LPAR flag for code that should only be
executed if Linux is running in an LPAR.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

arch/s390/include/asm/setup.h | 3 +++
arch/s390/kernel/early.c | 9 ++++++---
arch/s390/kernel/setup.c | 4 ++--
drivers/s390/cio/cio.c | 2 +-
drivers/s390/cio/qdio_main.c | 2 +-
5 files changed, 13 insertions(+), 7 deletions(-)

Index: quilt-2.6/arch/s390/include/asm/setup.h
===================================================================
--- quilt-2.6.orig/arch/s390/include/asm/setup.h 2010-02-24 09:28:13.000000000 +0100
+++ quilt-2.6/arch/s390/include/asm/setup.h 2010-02-24 09:44:25.000000000 +0100
@@ -71,9 +71,12 @@
#define MACHINE_FLAG_KVM (1UL << 9)
#define MACHINE_FLAG_HPAGE (1UL << 10)
#define MACHINE_FLAG_PFMF (1UL << 11)
+#define MACHINE_FLAG_LPAR (1UL << 12)

#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
#define MACHINE_IS_KVM (S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
+#define MACHINE_IS_LPAR (S390_lowcore.machine_flags & MACHINE_FLAG_LPAR)
+
#define MACHINE_HAS_DIAG9C (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG9C)

#ifndef __s390x__
Index: quilt-2.6/arch/s390/kernel/early.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/early.c 2010-02-24 09:28:13.000000000 +0100
+++ quilt-2.6/arch/s390/kernel/early.c 2010-02-24 09:44:25.000000000 +0100
@@ -214,10 +214,13 @@

static noinline __init void detect_machine_type(void)
{
- /* No VM information? Looks like LPAR */
- if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
+ /* Check current-configuration-level */
+ if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
+ S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
return;
- if (!vmms.count)
+ }
+ /* Get virtual-machine cpu information. */
+ if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count)
return;

/* Running under KVM? If not we assume z/VM */
Index: quilt-2.6/arch/s390/kernel/setup.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/setup.c 2010-02-24 09:28:13.000000000 +0100
+++ quilt-2.6/arch/s390/kernel/setup.c 2010-02-24 09:44:25.000000000 +0100
@@ -804,7 +804,7 @@
if (MACHINE_IS_VM)
pr_info("Linux is running as a z/VM "
"guest operating system in 31-bit mode\n");
- else
+ else if (MACHINE_IS_LPAR)
pr_info("Linux is running natively in 31-bit mode\n");
if (MACHINE_HAS_IEEE)
pr_info("The hardware system has IEEE compatible "
@@ -818,7 +818,7 @@
"guest operating system in 64-bit mode\n");
else if (MACHINE_IS_KVM)
pr_info("Linux is running under KVM in 64-bit mode\n");
- else
+ else if (MACHINE_IS_LPAR)
pr_info("Linux is running natively in 64-bit mode\n");
#endif /* CONFIG_64BIT */

Index: quilt-2.6/drivers/s390/cio/cio.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/cio.c 2010-02-24 09:28:13.000000000 +0100
+++ quilt-2.6/drivers/s390/cio/cio.c 2010-02-24 09:44:25.000000000 +0100
@@ -661,7 +661,7 @@
* We don't do this for VM because a tpi drops the cpu
* out of the sie which costs more cycles than it saves.
*/
- } while (!MACHINE_IS_VM && tpi (NULL) != 0);
+ } while (MACHINE_IS_LPAR && tpi(NULL) != 0);
irq_exit();
set_irq_regs(old_regs);
}
Index: quilt-2.6/drivers/s390/cio/qdio_main.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/qdio_main.c 2010-02-24 09:44:25.000000000 +0100
+++ quilt-2.6/drivers/s390/cio/qdio_main.c 2010-02-24 09:44:25.000000000 +0100
@@ -534,7 +534,7 @@

if ((bufnr != q->last_move) || q->qdio_error) {
q->last_move = bufnr;
- if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
+ if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
q->u.in.timestamp = get_usecs();
return 1;
} else


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