[v2][PATCH 2/7] book3e/kexec/kdump: enable kexec for kernel

[Tiejun Chen <tiejun.chen@windriver.com>]

We need to active KEXEC for book3e and bypass or convert non-book3e stuff
in kexec coverage.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
---
 arch/powerpc/Kconfig                   |    2 +-
 arch/powerpc/kernel/machine_kexec_64.c |    6 ++++++
 arch/powerpc/kernel/misc_64.S          |    6 ++++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c33e3ad..6ecf3c9 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -364,7 +364,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
 
 config KEXEC
 	bool "kexec system call"
-	depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP))
+	depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
 	help
 	  kexec is a system call that implements the ability to shutdown your
 	  current kernel, and to start another kernel.  It is like a reboot
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index 611acdf..ef39271 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -33,6 +33,7 @@
 int default_machine_kexec_prepare(struct kimage *image)
 {
 	int i;
+#ifndef CONFIG_PPC_BOOK3E
 	unsigned long begin, end;	/* limits of segment */
 	unsigned long low, high;	/* limits of blocked memory range */
 	struct device_node *node;
@@ -41,6 +42,7 @@ int default_machine_kexec_prepare(struct kimage *image)
 
 	if (!ppc_md.hpte_clear_all)
 		return -ENOENT;
+#endif
 
 	/*
 	 * Since we use the kernel fault handlers and paging code to
@@ -51,6 +53,7 @@ int default_machine_kexec_prepare(struct kimage *image)
 		if (image->segment[i].mem < __pa(_end))
 			return -ETXTBSY;
 
+#ifndef CONFIG_PPC_BOOK3E
 	/*
 	 * For non-LPAR, we absolutely can not overwrite the mmu hash
 	 * table, since we are still using the bolted entries in it to
@@ -92,6 +95,7 @@ int default_machine_kexec_prepare(struct kimage *image)
 				return -ETXTBSY;
 		}
 	}
+#endif
 
 	return 0;
 }
@@ -367,6 +371,7 @@ void default_machine_kexec(struct kimage *image)
 	/* NOTREACHED */
 }
 
+#ifndef CONFIG_PPC_BOOK3E
 /* Values we need to export to the second kernel via the device tree. */
 static unsigned long htab_base;
 
@@ -411,3 +416,4 @@ static int __init export_htab_values(void)
 	return 0;
 }
 late_initcall(export_htab_values);
+#endif
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index 6820e45..f1a7ce7 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -543,9 +543,13 @@ _GLOBAL(kexec_sequence)
 	lhz	r25,PACAHWCPUID(r13)	/* get our phys cpu from paca */
 
 	/* disable interrupts, we are overwriting kernel data next */
+#ifndef CONFIG_PPC_BOOK3E
 	mfmsr	r3
 	rlwinm	r3,r3,0,17,15
 	mtmsrd	r3,1
+#else
+	wrteei	0
+#endif
 
 	/* copy dest pages, flush whole dest image */
 	mr	r3,r29
@@ -567,10 +571,12 @@ _GLOBAL(kexec_sequence)
 	li	r6,1
 	stw	r6,kexec_flag-1b(5)
 
+#ifndef CONFIG_PPC_BOOK3E
 	/* clear out hardware hash page table and tlb */
 	ld	r5,0(r27)		/* deref function descriptor */
 	mtctr	r5
 	bctrl				/* ppc_md.hpte_clear_all(void); */
+#endif
 
 /*
  *   kexec image calling is:
-- 
1.7.9.5