From 54c32021eb6feafc32e90104e960b38301521b7b Mon Sep 17 00:00:00 2001
From: Michael Ellerman <michael@ellerman.id.au>
Date: Sun, 4 Dec 2005 18:39:51 +1100
Subject: [PATCH] [PATCH] powerpc: Add arch-dependent copy_oldmem_page

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---
 arch/powerpc/kernel/crash_dump.c | 36 ++++++++++++++++++++++++++++++++
 include/asm-powerpc/kexec.h      |  2 ++
 kernel/crash_dump.c              |  3 +++
 3 files changed, 41 insertions(+)

diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 5337ab759780..87effa3f21a7 100644
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -16,6 +16,7 @@
 #include <asm/kdump.h>
 #include <asm/lmb.h>
 #include <asm/firmware.h>
+#include <asm/uaccess.h>
 
 #ifdef DEBUG
 #include <asm/udbg.h>
@@ -71,3 +72,38 @@ static int __init parse_savemaxmem(char *p)
 	return 0;
 }
 __setup("savemaxmem=", parse_savemaxmem);
+
+/*
+ * copy_oldmem_page - copy one page from "oldmem"
+ * @pfn: page frame number to be copied
+ * @buf: target memory address for the copy; this can be in kernel address
+ *      space or user address space (see @userbuf)
+ * @csize: number of bytes to copy
+ * @offset: offset in bytes into the page (based on pfn) to begin the copy
+ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
+ *      otherwise @buf is in kernel address space, use memcpy().
+ *
+ * Copy a page from "oldmem". For this page, there is no pte mapped
+ * in the current kernel. We stitch up a pte, similar to kmap_atomic.
+ */
+ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
+			size_t csize, unsigned long offset, int userbuf)
+{
+	void  *vaddr;
+
+	if (!csize)
+		return 0;
+
+	vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0);
+
+	if (userbuf) {
+		if (copy_to_user((char __user *)buf, (vaddr + offset), csize)) {
+			iounmap(vaddr);
+			return -EFAULT;
+		}
+	} else
+		memcpy(buf, (vaddr + offset), csize);
+
+	iounmap(vaddr);
+	return csize;
+}
diff --git a/include/asm-powerpc/kexec.h b/include/asm-powerpc/kexec.h
index ae76ed5d973f..c0f6d6b0d935 100644
--- a/include/asm-powerpc/kexec.h
+++ b/include/asm-powerpc/kexec.h
@@ -30,6 +30,8 @@
 #define KEXEC_ARCH KEXEC_ARCH_PPC
 #endif
 
+#define HAVE_ARCH_COPY_OLDMEM_PAGE
+
 #ifndef __ASSEMBLY__
 
 #ifdef CONFIG_KEXEC
diff --git a/kernel/crash_dump.c b/kernel/crash_dump.c
index 334c37f5218a..fccb27dbc623 100644
--- a/kernel/crash_dump.c
+++ b/kernel/crash_dump.c
@@ -14,10 +14,12 @@
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
+#include <asm/kexec.h>
 
 /* Stores the physical address of elf header of crash image. */
 unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
 
+#ifndef HAVE_ARCH_COPY_OLDMEM_PAGE
 /**
  * copy_oldmem_page - copy one page from "oldmem"
  * @pfn: page frame number to be copied
@@ -59,3 +61,4 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 	kfree(page);
 	return csize;
 }
+#endif
-- 
2.20.1