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libnvdimm, pmem: clear poison on write

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If a write is directed at a known bad block perform the following:

1/ write the data

2/ send a clear poison command

3/ invalidate the poison out of the cache hierarchy

Cc: <x86@kernel.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2016-03-08 07:16:07 -08:00
parent b5ebc8ec69
commit 59e6473980
5 changed files with 100 additions and 1 deletions
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19
include/linux/pmem.h
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@@ -58,6 +58,11 @@ static inline void arch_wb_cache_pmem(void __pmem *addr, size_t size)
{
BUG();
}
static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
{
BUG();
}
#endif
/*
@@ -185,6 +190,20 @@ static inline void clear_pmem(void __pmem *addr, size_t size)
default_clear_pmem(addr, size);
}
/**
* invalidate_pmem - flush a pmem range from the cache hierarchy
* @addr: virtual start address
* @size: bytes to invalidate (internally aligned to cache line size)
*
* For platforms that support clearing poison this flushes any poisoned
* ranges out of the cache
*/
static inline void invalidate_pmem(void __pmem *addr, size_t size)
{
if (arch_has_pmem_api())
arch_invalidate_pmem(addr, size);
}
/**
* wb_cache_pmem - write back processor cache for PMEM memory range
* @addr: virtual start address