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authorAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>2020-07-01 12:52:32 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2020-07-16 13:00:22 +1000
commit3e79f082ebfc130360bcee23e4dd74729dcafdf4 (patch)
tree472f72323b983f91d8e078b32544e197c6e4848d /Documentation
parentd358042793183a57094dac45a44116e1165ac593 (diff)
libnvdimm/nvdimm/flush: Allow architecture to override the flush barrier
Architectures like ppc64 provide persistent memory specific barriers that will ensure that all stores for which the modifications are written to persistent storage by preceding dcbfps and dcbstps instructions have updated persistent storage before any data access or data transfer caused by subsequent instructions is initiated. This is in addition to the ordering done by wmb() Update nvdimm core such that architecture can use barriers other than wmb to ensure all previous writes are architecturally visible for the platform buffer flush. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200701072235.223558-5-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/memory-barriers.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index eaabc3134294..ff07cd3b2f82 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -1935,6 +1935,20 @@ There are some more advanced barrier functions:
relaxed I/O accessors and the Documentation/DMA-API.txt file for more
information on consistent memory.
+ (*) pmem_wmb();
+
+ This is for use with persistent memory to ensure that stores for which
+ modifications are written to persistent storage reached a platform
+ durability domain.
+
+ For example, after a non-temporal write to pmem region, we use pmem_wmb()
+ to ensure that stores have reached a platform durability domain. This ensures
+ that stores have updated persistent storage before any data access or
+ data transfer caused by subsequent instructions is initiated. This is
+ in addition to the ordering done by wmb().
+
+ For load from persistent memory, existing read memory barriers are sufficient
+ to ensure read ordering.
===============================
IMPLICIT KERNEL MEMORY BARRIERS