linux-kernel - [Patch 6/8] powerpc: implement crashkernel=auto

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Message-Id: <20090904101153.5220.97139.sendpatchset@localhost.localdomain>
Date:	Fri, 4 Sep 2009 06:09:26 -0400
From:	Amerigo Wang <amwang@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	Neil Horman <nhorman@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	kamezawa.hiroyu@...fujitsu.com, Andi Kleen <andi@...stfloor.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Amerigo Wang <amwang@...hat.com>,
	"M. Mohan Kumar" <mohan@...ibm.com>, akpm@...ux-foundation.org,
	bernhard.walle@....de, Fenghua Yu <fenghua.yu@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: [Patch 6/8] powerpc: implement crashkernel=auto


Since in patch 2/8 we already implement the generic part, this will
add the rest part for powerpc.

Signed-off-by: WANG Cong <amwang@...hat.com>
Cc: Anton Vorontsov <avorontsov@...mvista.com>
Cc: M. Mohan Kumar <mohan@...ibm.com>
Cc: Michael Ellerman <michael@...erman.id.au>

---

Index: linux-2.6/arch/powerpc/include/asm/kexec.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/kexec.h
+++ linux-2.6/arch/powerpc/include/asm/kexec.h
@@ -39,6 +39,28 @@ typedef void (*crash_shutdown_t)(void);
 
 #ifdef CONFIG_KEXEC
 
+#ifdef CONFIG_KEXEC_AUTO_RESERVE
+
+#ifndef KEXEC_AUTO_THRESHOLD
+#define KEXEC_AUTO_THRESHOLD (1ULL<<31) /* 2G */
+#endif
+
+#ifndef arch_default_crash_base
+extern
+unsigned long long __init arch_default_crash_base(void);
+#define arch_default_crash_base arch_default_crash_base
+#endif
+
+#ifndef arch_default_crash_size
+extern
+unsigned long long __init arch_default_crash_size(unsigned long long);
+#define arch_default_crash_size arch_default_crash_size
+#endif
+
+#endif
+
+#include <asm-generic/kexec.h>
+
 /*
  * This function is responsible for capturing register states if coming
  * via panic or invoking dump using sysrq-trigger.
Index: linux-2.6/arch/powerpc/kernel/machine_kexec.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/machine_kexec.c
+++ linux-2.6/arch/powerpc/kernel/machine_kexec.c
@@ -61,6 +61,30 @@ void machine_kexec(struct kimage *image)
 	for(;;);
 }
 
+#ifdef CONFIG_KEXEC_AUTO_RESERVE
+unsigned long long __init arch_default_crash_base(void)
+{
+	return KDUMP_KERNELBASE;
+}
+
+unsigned long long __init arch_default_crash_size(unsigned long long total_size)
+{
+	if (total_size < KEXEC_AUTO_THRESHOLD)
+		return 0;
+	if (total_size < (1ULL<<32))
+		return 1ULL<<27;
+	else {
+#ifdef CONFIG_64BIT
+		if (total_size > (1ULL<<37)) /* 128G */
+			return 1ULL<<32; /* 4G */
+		return 1ULL<<ilog2(roundup(total_size/32, 1ULL<<21));
+#else
+		return 1ULL<<28;
+#endif
+	}
+}
+#endif
+
 void __init reserve_crashkernel(void)
 {
 	unsigned long long crash_size, crash_base;
--
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