libnvdimm, pmem: clear poison on write
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>
diff --git a/include/linux/pmem.h b/include/linux/pmem.h
index 7c3d11a..3ec5309 100644
--- a/include/linux/pmem.h
+++ b/include/linux/pmem.h
@@ -58,6 +58,11 @@
{
BUG();
}
+
+static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
+{
+ BUG();
+}
#endif
/*
@@ -186,6 +191,20 @@
}
/**
+ * 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
* @size: number of bytes to write back