From: Hari Bathini Date: Wed, 11 Sep 2019 14:52:32 +0000 (+0530) Subject: powerpc/fadump: Warn before processing partial crashdump X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6071e8f9d5ac960f0d35495f070d4d0b7ae5fc76;p=linux.git 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/156821352793.5656.1734051341024721407.stgit@hbathini.in.ibm.com --- diff --git a/arch/powerpc/platforms/powernv/opal-fadump.c b/arch/powerpc/platforms/powernv/opal-fadump.c index 5ace7c4d6bc16..533adae545d8a 100644 --- a/arch/powerpc/platforms/powernv/opal-fadump.c +++ b/arch/powerpc/platforms/powernv/opal-fadump.c @@ -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); }