From 654f596da4a83a8d2734fba26c2a1257533e6d75 Mon Sep 17 00:00:00 2001 From: Manish Ahuja Date: Sat, 22 Mar 2008 11:38:59 +1100 Subject: [PATCH] [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 Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/prom.c | 5 +++++ arch/powerpc/platforms/pseries/phyp_dump.c | 18 ++++++++++++++++++ include/asm-powerpc/phyp_dump.h | 1 + 3 files changed, 24 insertions(+) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index e6c022ef12..9330920265 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 034fe1b54d..f80f8606c6 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); + diff --git a/include/asm-powerpc/phyp_dump.h b/include/asm-powerpc/phyp_dump.h index b454de45b2..209a98913d 100644 --- a/include/asm-powerpc/phyp_dump.h +++ b/include/asm-powerpc/phyp_dump.h @@ -25,6 +25,7 @@ struct phyp_dump { unsigned long init_reserve_start; unsigned long init_reserve_size; /* Check status during boot if dump supported, active & present*/ + unsigned long phyp_dump_at_boot; unsigned long phyp_dump_configured; unsigned long phyp_dump_is_active; /* store cpu & hpte size */ -- 2.39.5