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Subject[Patch 4/8] ia64: implement crashkernel=auto

Since in patch 2/8 we already implement the generic part, this will
add the rest part for ia64.

Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>

---
Index: linux-2.6/arch/ia64/include/asm/kexec.h
===================================================================
--- linux-2.6.orig/arch/ia64/include/asm/kexec.h
+++ linux-2.6/arch/ia64/include/asm/kexec.h
@@ -1,6 +1,7 @@
#ifndef _ASM_IA64_KEXEC_H
#define _ASM_IA64_KEXEC_H

+#include <asm-generic/kexec.h>

/* Maximum physical address we can use pages from */
#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
@@ -19,6 +20,49 @@
flush_icache_range(page_addr, page_addr + PAGE_SIZE); \
} while(0)

+#ifdef CONFIG_KEXEC_AUTO_RESERVE
+#define MBYTES(n) ((n)*1024*1024ULL)
+#define GBYTES(n) ((n)*1024*1024*1024ULL)
+/*
+ Memory size Reserved memory
+ =========== ===============
+ [4G, 12G) 256M
+ [12G, 128G) 512M
+ [128G, 256G) 768M
+ [256G, 378G) 1024M
+ [378G, 512G) 1536M
+ [512G, 768G) 2048M
+ [768G, ) 3072M
+ */
+static inline
+unsigned long long arch_default_crash_size(unsigned long long total_size)
+{
+ unsigned long long ret;
+
+ if (total_size >= GBYTES(4) && total_size < GBYTES(12))
+ ret = MBYTES(256);
+ else if (total_size >= GBYTES(12) && total_size < GBYTES(128))
+ ret = MBYTES(512);
+ else if (total_size >= GBYTES(128) && total_size < GBYTES(256))
+ ret = MBYTES(768);
+ else if (total_size >= GBYTES(256) && total_size < GBYTES(378))
+ ret = MBYTES(1024);
+ else if (total_size >= GBYTES(318) && total_size < GBYTES(512))
+ ret = MBYTES(1536);
+ else if (total_size >= GBYTES(512) && total_size < GBYTES(768))
+ ret = MBYTES(2048);
+ else
+ ret = MBYTES(3072);
+ if (!ia64_platform_is("sn2") && !ia64_platform_is("uv"))
+ if (ret > GBYTES(4))
+ ret = ret / GBYTES(4) * MBYTES(256);
+ return ret;
+}
+#undef GBYTES
+#undef MBYTES
+#define arch_default_crash_size arch_default_crash_size
+#endif
+
extern struct kimage *ia64_kimage;
extern const unsigned int relocate_new_kernel_size;
extern void relocate_new_kernel(unsigned long, unsigned long,

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