diff options
| author | Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | 2012-02-16 01:14:22 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-02-23 10:50:01 +1100 |
| commit | eb39c8803d0e3d98fe74825f99287f63d55e6460 (patch) | |
| tree | cf157bb2bb5271aaf1823e9ee3b91800c00c8b05 /arch/powerpc/kernel/prom.c | |
| parent | 8e0aa6d436f303a37df7ec68758883ade077d123 (diff) | |
| download | lwn-eb39c8803d0e3d98fe74825f99287f63d55e6460.tar.gz lwn-eb39c8803d0e3d98fe74825f99287f63d55e6460.zip | |
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>
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index abe405dab34d..70222b35cfc5 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -55,6 +55,7 @@ #include <asm/phyp_dump.h> #include <asm/kexec.h> #include <asm/opal.h> +#include <asm/fadump.h> #include <mm/mmu_decl.h> @@ -719,6 +720,11 @@ void __init early_init_devtree(void *params) of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL); #endif +#ifdef CONFIG_FA_DUMP + /* scan tree to see if dump is active during last boot */ + of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); +#endif + /* Pre-initialize the cmd_line with the content of boot_commmand_line, * which will be empty except when the content of the variable has * been overriden by a bootloading mechanism. This happens typically @@ -750,7 +756,14 @@ void __init early_init_devtree(void *params) if (PHYSICAL_START > MEMORY_START) memblock_reserve(MEMORY_START, 0x8000); reserve_kdump_trampoline(); - reserve_crashkernel(); +#ifdef CONFIG_FA_DUMP + /* + * If we fail to reserve memory for firmware-assisted dump then + * fallback to kexec based kdump. + */ + if (fadump_reserve_mem() == 0) +#endif + reserve_crashkernel(); early_reserve_mem(); phyp_dump_reserve_mem(); |