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From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: vgoyal@redhat.com
Cc: oomichi@mxs.nes.nec.co.jp, linux-s390@vger.kernel.org,
	mahesh@linux.vnet.ibm.com, heiko.carstens@de.ibm.com,
	linux-kernel@vger.kernel.org, hbabu@us.ibm.com,
	horms@verge.net.au, ebiederm@xmission.com,
	schwidefsky@de.ibm.com, kexec@lists.infradead.org
Subject: [patch v2 07/10] s390: Use diagnose 308 for system reset
Date: Wed, 27 Jul 2011 14:55:11 +0200	[thread overview]
Message-ID: <20110727125808.516079721@linux.vnet.ibm.com> (raw)
In-Reply-To: 20110727125504.491183728@linux.vnet.ibm.com

[-- Attachment #1: s390-kdump-arch-diag308_reset.patch --]
[-- Type: text/plain, Size: 2224 bytes --]

From: Michael Holzheu <holzheu@linux.vnet.ibm.com>

The diagnose 308 call is the prefered method for clearing all ongoing I/O.
Therefore if it is available we use it instead of doing a manual reset.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
 arch/s390/include/asm/ipl.h |    1 +
 arch/s390/kernel/base.S     |   36 ++++++++++++++++++++++++++++++++++++
 arch/s390/kernel/ipl.c      |    6 ++++++
 3 files changed, 43 insertions(+)

--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -167,5 +167,6 @@ enum diag308_rc {
 };
 
 extern int diag308(unsigned long subcode, void *addr);
+extern void diag308_reset(void);
 
 #endif /* _ASM_S390_IPL_H */
--- a/arch/s390/kernel/base.S
+++ b/arch/s390/kernel/base.S
@@ -76,6 +76,42 @@ s390_base_pgm_handler_fn:
 	.quad	0
 	.previous
 
+#
+# Calls diag 308 subcode 1 and continues execution
+#
+# The following conditions must be ensured before calling this function:
+# * Prefix register = 0
+# * Lowcore protection is disabled
+#
+ENTRY(diag308_reset)
+	larl	%r4,.Lctlregs		# Save control registers
+	stctg	%c0,%c15,0(%r4)
+	larl	%r4,.Lrestart_psw	# Setup restart PSW at absolute 0
+	lghi	%r3,0
+	lg	%r4,0(%r4)		# Save PSW
+	sturg	%r4,%r3			# Use sturg, because of large pages
+	lghi	%r1,1
+	diag	%r1,%r1,0x308
+.Lrestart_part2:
+	lhi	%r0,0			# Load r0 with zero
+	lhi	%r1,2			# Use mode 2 = ESAME (dump)
+	sigp	%r1,%r0,0x12		# Switch to ESAME mode
+	sam64				# Switch to 64 bit addressing mode
+	larl	%r4,.Lctlregs		# Restore control registers
+	lctlg	%c0,%c15,0(%r4)
+	br	%r14
+.align 16
+.Lrestart_psw:
+	.long	0x00080000,0x80000000 + .Lrestart_part2
+
+	.section .bss
+.align 8
+.Lctlregs:
+	.rept	16
+	.quad	0
+	.endr
+	.previous
+
 #else /* CONFIG_64BIT */
 
 ENTRY(s390_base_mcck_handler)
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1996,6 +1996,12 @@ static void do_reset_calls(void)
 {
 	struct reset_call *reset;
 
+#ifdef CONFIG_64BIT
+	if (diag308_set_works) {
+		diag308_reset();
+		return;
+	}
+#endif
 	list_for_each_entry(reset, &rcall, list)
 		reset->fn();
 }


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WARNING: multiple messages have this Message-ID (diff)
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: vgoyal@redhat.com
Cc: ebiederm@xmission.com, mahesh@linux.vnet.ibm.com,
	hbabu@us.ibm.com, oomichi@mxs.nes.nec.co.jp, horms@verge.net.au,
	schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-s390@vger.kernel.org
Subject: [patch v2 07/10] s390: Use diagnose 308 for system reset
Date: Wed, 27 Jul 2011 14:55:11 +0200	[thread overview]
Message-ID: <20110727125808.516079721@linux.vnet.ibm.com> (raw)
In-Reply-To: 20110727125504.491183728@linux.vnet.ibm.com

[-- Attachment #1: s390-kdump-arch-diag308_reset.patch --]
[-- Type: text/plain, Size: 2079 bytes --]

From: Michael Holzheu <holzheu@linux.vnet.ibm.com>

The diagnose 308 call is the prefered method for clearing all ongoing I/O.
Therefore if it is available we use it instead of doing a manual reset.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
 arch/s390/include/asm/ipl.h |    1 +
 arch/s390/kernel/base.S     |   36 ++++++++++++++++++++++++++++++++++++
 arch/s390/kernel/ipl.c      |    6 ++++++
 3 files changed, 43 insertions(+)

--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -167,5 +167,6 @@ enum diag308_rc {
 };
 
 extern int diag308(unsigned long subcode, void *addr);
+extern void diag308_reset(void);
 
 #endif /* _ASM_S390_IPL_H */
--- a/arch/s390/kernel/base.S
+++ b/arch/s390/kernel/base.S
@@ -76,6 +76,42 @@ s390_base_pgm_handler_fn:
 	.quad	0
 	.previous
 
+#
+# Calls diag 308 subcode 1 and continues execution
+#
+# The following conditions must be ensured before calling this function:
+# * Prefix register = 0
+# * Lowcore protection is disabled
+#
+ENTRY(diag308_reset)
+	larl	%r4,.Lctlregs		# Save control registers
+	stctg	%c0,%c15,0(%r4)
+	larl	%r4,.Lrestart_psw	# Setup restart PSW at absolute 0
+	lghi	%r3,0
+	lg	%r4,0(%r4)		# Save PSW
+	sturg	%r4,%r3			# Use sturg, because of large pages
+	lghi	%r1,1
+	diag	%r1,%r1,0x308
+.Lrestart_part2:
+	lhi	%r0,0			# Load r0 with zero
+	lhi	%r1,2			# Use mode 2 = ESAME (dump)
+	sigp	%r1,%r0,0x12		# Switch to ESAME mode
+	sam64				# Switch to 64 bit addressing mode
+	larl	%r4,.Lctlregs		# Restore control registers
+	lctlg	%c0,%c15,0(%r4)
+	br	%r14
+.align 16
+.Lrestart_psw:
+	.long	0x00080000,0x80000000 + .Lrestart_part2
+
+	.section .bss
+.align 8
+.Lctlregs:
+	.rept	16
+	.quad	0
+	.endr
+	.previous
+
 #else /* CONFIG_64BIT */
 
 ENTRY(s390_base_mcck_handler)
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1996,6 +1996,12 @@ static void do_reset_calls(void)
 {
 	struct reset_call *reset;
 
+#ifdef CONFIG_64BIT
+	if (diag308_set_works) {
+		diag308_reset();
+		return;
+	}
+#endif
 	list_for_each_entry(reset, &rcall, list)
 		reset->fn();
 }

  parent reply	other threads:[~2011-07-27 12:58 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-27 12:55 [patch v2 00/10] kdump: Patch series for s390 support (version 2) Michael Holzheu
2011-07-27 12:55 ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 01/10] kdump: Add KEXEC_CRASH_CONTROL_MEMORY_LIMIT Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:16   ` Vivek Goyal
2011-08-01 20:16     ` Vivek Goyal
2011-08-02  9:51     ` Michael Holzheu
2011-08-02  9:51       ` Michael Holzheu
2011-08-02 19:16       ` Vivek Goyal
2011-08-02 19:16         ` Vivek Goyal
2011-08-03  9:27         ` Michael Holzheu
2011-08-03  9:27           ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 02/10] kdump: Make kimage_load_crash_segment() weak Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:31   ` Vivek Goyal
2011-08-01 20:31     ` Vivek Goyal
2011-08-02  9:30     ` Michael Holzheu
2011-08-02  9:30       ` Michael Holzheu
2011-08-02 18:55       ` Vivek Goyal
2011-08-02 18:55         ` Vivek Goyal
2011-08-03 10:41         ` Michael Holzheu
2011-08-03 10:41           ` Michael Holzheu
2011-08-04 20:25           ` Vivek Goyal
2011-08-04 20:25             ` Vivek Goyal
2011-07-27 12:55 ` [patch v2 03/10] kdump: Add size to elfcorehdr kernel parameter Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:36   ` Vivek Goyal
2011-08-01 20:36     ` Vivek Goyal
2011-08-02  9:08     ` Michael Holzheu
2011-08-02  9:08       ` Michael Holzheu
2011-08-02 18:55       ` Vivek Goyal
2011-08-02 18:55         ` Vivek Goyal
2011-08-03 10:40         ` Michael Holzheu
2011-08-03 10:40           ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 04/10] kdump: Trigger kdump via panic notifier chain on s390 Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:41   ` Vivek Goyal
2011-08-01 20:41     ` Vivek Goyal
2011-08-02  8:37     ` Michael Holzheu
2011-08-02  8:37       ` Michael Holzheu
2011-08-02 19:21       ` Vivek Goyal
2011-08-02 19:21         ` Vivek Goyal
2011-08-03  9:50         ` Michael Holzheu
2011-08-03  9:50           ` Michael Holzheu
2011-08-04 21:14           ` Vivek Goyal
2011-08-04 21:14             ` Vivek Goyal
2011-08-08 17:47             ` Michael Holzheu
2011-08-08 17:47               ` Michael Holzheu
2011-08-09 21:19               ` Vivek Goyal
2011-08-09 21:19                 ` Vivek Goyal
2011-07-27 12:55 ` [patch v2 05/10] s390: Add PSW restart shutdown trigger Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:54   ` Vivek Goyal
2011-08-01 20:54     ` Vivek Goyal
2011-08-02  8:05     ` Michael Holzheu
2011-08-02  8:05       ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 06/10] s390: Export store_status() function Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` Michael Holzheu [this message]
2011-07-27 12:55   ` [patch v2 07/10] s390: Use diagnose 308 for system reset Michael Holzheu
2011-07-27 12:55 ` [patch v2 08/10] s390: Add real memory access functions Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 09/10] s390: kdump backend code Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 10/10] kexec-tools: Add s390 kdump support Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu

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