From 8ff812719ac73ef9428b788e210221c8d87b2a8c Mon Sep 17 00:00:00 2001 From: Hari Bathini Date: Fri, 15 Nov 2013 23:01:32 +0530 Subject: 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/machine_kexec.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'arch/powerpc/kernel/machine_kexec.c') diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c index e1ec57e87b3..88a7fb458df 100644 --- a/arch/powerpc/kernel/machine_kexec.c +++ b/arch/powerpc/kernel/machine_kexec.c @@ -18,6 +18,7 @@ #include #include +#include #include #include @@ -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 } /* -- cgit v1.2.3-70-g09d2 From e641eb03ab2b0f065fa5e64b4202fb5b0441b427 Mon Sep 17 00:00:00 2001 From: Mahesh Salgaonkar Date: Mon, 9 Dec 2013 15:33:39 +0530 Subject: powerpc: Fix up the kdump base cap to 128M The current logic sets the kdump base to min of 2G or ppc64_rma_size/2. On PowerNV kernel the first memory block 'memory@0' can be very large, equal to the DIMM size with ppc64_rma_size value capped to 1G. Hence on PowerNV, kdump base is set to 512M resulting kdump to fail while allocating paca array. This is because, paca need its memory from RMA region capped at 256M (see allocate_pacas()). This patch lowers the kdump base cap to 128M so that kdump kernel can successfully get memory below 256M for paca allocation. Signed-off-by: Mahesh Salgaonkar Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/machine_kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc/kernel/machine_kexec.c') diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c index 88a7fb458df..75d4f7340da 100644 --- a/arch/powerpc/kernel/machine_kexec.c +++ b/arch/powerpc/kernel/machine_kexec.c @@ -148,7 +148,7 @@ void __init reserve_crashkernel(void) * a small SLB (128MB) since the crash kernel needs to place * itself and some stacks to be in the first segment. */ - crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2)); + crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2)); #else crashk_res.start = KDUMP_KERNELBASE; #endif -- cgit v1.2.3-70-g09d2