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authorBalbir Singh <bsingharora@gmail.com>2018-04-06 15:24:23 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2018-04-24 09:46:56 +1000
commitfb5924fddf9ee31db04da7ad4e8c3434a387101b (patch)
treebe4e071f9cb1e80dd554d80f5667595e1879f3f4 /arch/sparc
parent6d08b06e67cd117f6992c46611dfb4ce267cd71e (diff)
downloadlinux-fb5924fddf9ee31db04da7ad4e8c3434a387101b.tar.bz2
powerpc/mm: Flush cache on memory hot(un)plug
This patch adds support for flushing potentially dirty cache lines when memory is hot-plugged/hot-un-plugged. The support is currently limited to 64 bit systems. The bug was exposed when mappings for a device were actually hot-unplugged and plugged in back later. A similar issue was observed during the development of memtrace, but memtrace does it's own flushing of region via a custom routine. These patches do a flush both on hotplug/unplug to clear any stale data in the cache w.r.t mappings, there is a small race window where a clean cache line may be created again just prior to tearing down the mapping. The patches were tested by disabling the flush routines in memtrace and doing I/O on the trace file. The system immediately checkstops (quite reliablly if prior to the hot-unplug of the memtrace region, we memset the regions we are about to hot unplug). After these patches no custom flushing is needed in the memtrace code. Fixes: 9d5171a8f248 ("powerpc/powernv: Enable removal of memory for in memory tracing") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Balbir Singh <bsingharora@gmail.com> Acked-by: Reza Arbab <arbab@linux.ibm.com> Reviewed-by: Rashmica Gupta <rashmica.g@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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