fadump: Reserve the memory for firmware assisted dump.

Reserve the memory during early boot to preserve CPU state data, HPTE region
and RMA (real mode area) region data in case of kernel crash. At the time of
crash, powerpc firmware will store CPU state data, HPTE region data and move
RMA region data to the reserved memory area.

If the firmware-assisted dump fails to reserve the memory, then fallback
to existing kexec-based kdump.

Most of the code implementation to reserve memory has been
adapted from phyp assisted dump implementation written by Linas Vepstas
and Manish Ahuja

This patch also introduces a config option CONFIG_FA_DUMP for firmware
assisted dump feature on Powerpc (ppc64) architecture.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 1919634a9b32..afa4dabfad7c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -386,6 +386,19 @@ config PHYP_DUMP
 
           If unsure, say "N"
 
+config FA_DUMP
+        bool "Firmware-assisted dump"
+        depends on PPC64 && PPC_RTAS && CRASH_DUMP
+        help
+          A robust mechanism to get reliable kernel crash dump with
+          assistance from firmware. This approach does not use kexec,
+          instead firmware assists in booting the kdump kernel
+          while preserving memory contents. Firmware-assisted dump
+          is meant to be a kdump replacement offering robustness and
+          speed not possible without system firmware assistance.
+
+          If unsure, say "N"
+
 config IRQ_ALL_CPUS
         bool "Distribute interrupts on all CPUs by default"
         depends on SMP && !MV64360