arm64: kdump: add VMCOREINFO's for user-space tools

In addition to common VMCOREINFO's defined in
crash_save_vmcoreinfo_init(), we need to know, for crash utility,
  - kimage_voffset
  - PHYS_OFFSET
to examine the contents of a dump file (/proc/vmcore) correctly
due to the introduction of KASLR (CONFIG_RANDOMIZE_BASE) in v4.6.

  - VA_BITS
is also required for makedumpfile command.

arch_crash_save_vmcoreinfo() appends them to the dump file.
More VMCOREINFO's may be added later.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index 779a800..481f54a 100644 (file)
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -18,6 +18,7 @@
 
 #include <asm/cacheflush.h>
 #include <asm/cpu_ops.h>
+#include <asm/memory.h>
 #include <asm/mmu.h>
 #include <asm/mmu_context.h>
 #include <asm/page.h>
@@ -351,3 +352,13 @@ void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
        }
 }
 #endif /* CONFIG_HIBERNATION */
+
+void arch_crash_save_vmcoreinfo(void)
+{
+       VMCOREINFO_NUMBER(VA_BITS);
+       /* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */
+       vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n",
+                                               kimage_voffset);
+       vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n",
+                                               PHYS_OFFSET);
+}