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powerpc/fadump: Warn before processing partial crashdump 

If all kernel boot memory regions are not registered for MPIPL before
system crashes, try processing the partial crashdump but warn the user
before proceeding.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821352793.5656.1734051341024721407.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini 2019-09-11 20:22:32 +05:30 committed by Michael Ellerman
parent 2a1b06dd3a
commit 6071e8f9d5
1 changed files with 24 additions and 0 deletions
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24
arch/powerpc/platforms/powernv/opal-fadump.c
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@ -69,6 +69,30 @@ static void opal_fadump_get_config(struct fw_dump *fadump_conf,
*/
fadump_conf->reserve_dump_area_start = fdm->rgn[0].dest;
/*
* Rarely, but it can so happen that system crashes before all
* boot memory regions are registered for MPIPL. In such
* cases, warn that the vmcore may not be accurate and proceed
* anyway as that is the best bet considering free pages, cache
* pages, user pages, etc are usually filtered out.
*
* Hope the memory that could not be preserved only has pages
* that are usually filtered out while saving the vmcore.
*/
if (fdm->region_cnt > fdm->registered_regions) {
pr_warn("Not all memory regions were saved!!!\n");
pr_warn(" Unsaved memory regions:\n");
i = fdm->registered_regions;
while (i < fdm->region_cnt) {
pr_warn("\t[%03d] base: 0x%llx, size: 0x%llx\n",
i, fdm->rgn[i].src, fdm->rgn[i].size);
i++;
}
pr_warn("If the unsaved regions only contain pages that are filtered out (eg. free/user pages), the vmcore should still be usable.\n");
pr_warn("WARNING: If the unsaved regions contain kernel pages, the vmcore will be corrupted.\n");
}
opal_fadump_update_config(fadump_conf, fdm);
}