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authorManish Ahuja <ahuja@austin.ibm.com>2008-03-22 11:38:59 +1100
committerPaul Mackerras <paulus@samba.org>2008-03-26 08:44:07 +1100
commit654f596da4a83a8d2734fba26c2a1257533e6d75 (patch)
treea937646dfd6e225e6b3f25d6adbde921200f21d9 /arch/powerpc
parent242f271c056f49b64b94c06b38fe9e8d3bf703bc (diff)
[POWERPC] pseries: phyp dump: Disable phyp-dump through boot-var
This adds a kernel command line option "phyp_dump", which takes a 0/1 value for disabling/ enabling phyp_dump at boot time. Kdump can use this on cmdline (phyp_dump=0) to disable phyp-dump during boot when enabling itself. This will ensure only one dumping mechanism is active at any given time. Signed-off-by: Manish Ahuja <mahuja@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/prom.c5
-rw-r--r--arch/powerpc/platforms/pseries/phyp_dump.c18
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index e6c022ef12e..9330920265f 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1060,6 +1060,11 @@ static void __init phyp_dump_reserve_mem(void)
return;
}
+ if (!phyp_dump_info->phyp_dump_at_boot) {
+ printk(KERN_INFO "Phyp-dump disabled at boot time\n");
+ return;
+ }
+
if (phyp_dump_info->phyp_dump_is_active) {
/* Reserve *everything* above RMR.Area freed by userland tools*/
base = PHYP_DUMP_RMR_END;
diff --git a/arch/powerpc/platforms/pseries/phyp_dump.c b/arch/powerpc/platforms/pseries/phyp_dump.c
index 034fe1b54dd..f80f8606c6b 100644
--- a/arch/powerpc/platforms/pseries/phyp_dump.c
+++ b/arch/powerpc/platforms/pseries/phyp_dump.c
@@ -460,3 +460,21 @@ int __init early_init_dt_scan_phyp_dump(unsigned long node,
*((unsigned long *)&sizes[4]);
return 1;
}
+
+/* Look for phyp_dump= cmdline option */
+static int __init early_phyp_dump_enabled(char *p)
+{
+ phyp_dump_info->phyp_dump_at_boot = 1;
+
+ if (!p)
+ return 0;
+
+ if (strncmp(p, "1", 1) == 0)
+ phyp_dump_info->phyp_dump_at_boot = 1;
+ else if (strncmp(p, "0", 1) == 0)
+ phyp_dump_info->phyp_dump_at_boot = 0;
+
+ return 0;
+}
+early_param("phyp_dump", early_phyp_dump_enabled);
+