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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-07-01 10:22:32 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-16 06:00:22 +0300 |
| commit | 3e79f082ebfc130360bcee23e4dd74729dcafdf4 (patch) | |
| tree | 472f72323b983f91d8e078b32544e197c6e4848d /include/asm-generic/barrier.h | |
| parent | d358042793183a57094dac45a44116e1165ac593 (diff) | |
| download | linux-3e79f082ebfc130360bcee23e4dd74729dcafdf4.tar.xz | |
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 'include/asm-generic/barrier.h')
| -rw-r--r-- | include/asm-generic/barrier.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h index 2eacaf7d62f6..b589bb216ee5 100644 --- a/include/asm-generic/barrier.h +++ b/include/asm-generic/barrier.h @@ -257,5 +257,15 @@ do { \ }) #endif +/* + * pmem_wmb() ensures that all stores for which the modification + * are written to persistent storage by preceding instructions have + * updated persistent storage before any data access or data transfer + * caused by subsequent instructions is initiated. + */ +#ifndef pmem_wmb +#define pmem_wmb() wmb() +#endif + #endif /* !__ASSEMBLY__ */ #endif /* __ASM_GENERIC_BARRIER_H */ |