powerpc/kdump: Adding symbols in vmcoreinfo to facilitate dump filtering

When CONFIG_SPARSEMEM_VMEMMAP option is used in kernel, makedumpfile fails
to filter vmcore dump as it fails to do vmemmap translations. So far
dump filtering on ppc64 never had to deal with vmemmap addresses seperately
as vmemmap regions where mapped in zone normal. But with the inclusion of
CONFIG_SPARSEMEM_VMEMMAP config option in kernel, this vmemmap address
translation support becomes necessary for dump filtering. For vmemmap adress
translation, few kernel symbols are needed by dump filtering tool. This patch
adds those symbols to vmcoreinfo, which a dump filtering tool can use for
filtering the kernel dump. Tested this changes successfully with makedumpfile
tool that supports vmemmap to physical address translation outside zone normal.

[ Removed unneeded #ifdef as suggested by Michael Ellerman --BenH ]

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h
index 16cb92d215d27850f3ba15a0b7417cc0d1719f13..694012877bf7f1cfd1e1ea067b448f7e7c449e87 100644 (file)
--- a/arch/powerpc/include/asm/pgalloc-64.h
+++ b/arch/powerpc/include/asm/pgalloc-64.h
@@ -16,6 +16,7 @@ struct vmemmap_backing {
        unsigned long phys;
        unsigned long virt_addr;
 };
+extern struct vmemmap_backing *vmemmap_list;
 
 /*
  * Functions that deal with pagetables that could be at any level of

diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index e1ec57e87b3b435b88ef55c4598d32c37c8e2e07..88a7fb458dfd50f0201d269d8177007cc382c62d 100644 (file)
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -18,6 +18,7 @@
 #include <linux/ftrace.h>
 
 #include <asm/machdep.h>
+#include <asm/pgalloc.h>
 #include <asm/prom.h>
 #include <asm/sections.h>
 
@@ -75,6 +76,17 @@ void arch_crash_save_vmcoreinfo(void)
 #ifndef CONFIG_NEED_MULTIPLE_NODES
        VMCOREINFO_SYMBOL(contig_page_data);
 #endif
+#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
+       VMCOREINFO_SYMBOL(vmemmap_list);
+       VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
+       VMCOREINFO_SYMBOL(mmu_psize_defs);
+       VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
+       VMCOREINFO_OFFSET(vmemmap_backing, list);
+       VMCOREINFO_OFFSET(vmemmap_backing, phys);
+       VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
+       VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
+       VMCOREINFO_OFFSET(mmu_psize_def, shift);
+#endif
 }
 
 /*