[S390] kdump backend code

This patch provides the architecture specific part of the s390 kdump
support.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index e4572601e91e..e3f51dfa5cad 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -38,6 +38,7 @@
 #include <linux/timex.h>
 #include <linux/bootmem.h>
 #include <linux/slab.h>
+#include <linux/crash_dump.h>
 #include <asm/asm-offsets.h>
 #include <asm/ipl.h>
 #include <asm/setup.h>
@@ -304,11 +305,13 @@ void smp_ctl_clear_bit(int cr, int bit)
 }
 EXPORT_SYMBOL(smp_ctl_clear_bit);
 
-#ifdef CONFIG_ZFCPDUMP
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
 
 static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
 {
-        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
+        if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE)
+                return;
+        if (is_kdump_kernel())
                 return;
         if (cpu >= NR_CPUS) {
                 pr_warning("CPU %i exceeds the maximum %i and is excluded from "
@@ -426,6 +429,18 @@ static void __init smp_detect_cpus(void)
         info = kmalloc(sizeof(*info), GFP_KERNEL);
         if (!info)
                 panic("smp_detect_cpus failed to allocate memory\n");
+#ifdef CONFIG_CRASH_DUMP
+        if (OLDMEM_BASE && !is_kdump_kernel()) {
+                struct save_area *save_area;
+
+                save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
+                if (!save_area)
+                        panic("could not allocate memory for save area\n");
+                copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
+                                 0x200, 0);
+                zfcpdump_save_areas[0] = save_area;
+        }
+#endif
         /* Use sigp detection algorithm if sclp doesn't work. */
         if (sclp_get_cpu_info(info)) {
                 smp_use_sigp_detection = 1;