* calling these symbols with arch_has_pmem_api() and redirect to the
* implementation in asm/pmem.h.
*/
-static inline bool __arch_has_wmb_pmem(void)
-{
- return false;
-}
-
-static inline void arch_wmb_pmem(void)
-{
- BUG();
-}
-
-static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
- size_t n)
+static inline void arch_memcpy_to_pmem(void *dst, const void *src, size_t n)
{
BUG();
}
-static inline int arch_memcpy_from_pmem(void *dst, const void __pmem *src,
- size_t n)
+static inline int arch_memcpy_from_pmem(void *dst, const void *src, size_t n)
{
BUG();
return -EFAULT;
}
-static inline size_t arch_copy_from_iter_pmem(void __pmem *addr, size_t bytes,
+static inline size_t arch_copy_from_iter_pmem(void *addr, size_t bytes,
struct iov_iter *i)
{
BUG();
return 0;
}
-static inline void arch_clear_pmem(void __pmem *addr, size_t size)
+static inline void arch_clear_pmem(void *addr, size_t size)
{
BUG();
}
-static inline void arch_wb_cache_pmem(void __pmem *addr, size_t size)
+static inline void arch_wb_cache_pmem(void *addr, size_t size)
{
BUG();
}
-static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
+static inline void arch_invalidate_pmem(void *addr, size_t size)
{
BUG();
}
return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
}
-static inline int default_memcpy_from_pmem(void *dst, void __pmem const *src,
- size_t size)
-{
- memcpy(dst, (void __force *) src, size);
- return 0;
-}
-
/*
* memcpy_from_pmem - read from persistent memory with error handling
* @dst: destination buffer
*
* Returns 0 on success negative error code on failure.
*/
-static inline int memcpy_from_pmem(void *dst, void __pmem const *src,
- size_t size)
+static inline int memcpy_from_pmem(void *dst, void const *src, size_t size)
{
if (arch_has_pmem_api())
return arch_memcpy_from_pmem(dst, src, size);
else
- return default_memcpy_from_pmem(dst, src, size);
-}
-
-/**
- * arch_has_wmb_pmem - true if wmb_pmem() ensures durability
- *
- * For a given cpu implementation within an architecture it is possible
- * that wmb_pmem() resolves to a nop. In the case this returns
- * false, pmem api users are unable to ensure durability and may want to
- * fall back to a different data consistency model, or otherwise notify
- * the user.
- */
-static inline bool arch_has_wmb_pmem(void)
-{
- return arch_has_pmem_api() && __arch_has_wmb_pmem();
-}
-
-/*
- * These defaults seek to offer decent performance and minimize the
- * window between i/o completion and writes being durable on media.
- * However, it is undefined / architecture specific whether
- * ARCH_MEMREMAP_PMEM + default_memcpy_to_pmem is sufficient for
- * making data durable relative to i/o completion.
- */
-static inline void default_memcpy_to_pmem(void __pmem *dst, const void *src,
- size_t size)
-{
- memcpy((void __force *) dst, src, size);
-}
-
-static inline size_t default_copy_from_iter_pmem(void __pmem *addr,
- size_t bytes, struct iov_iter *i)
-{
- return copy_from_iter_nocache((void __force *)addr, bytes, i);
-}
-
-static inline void default_clear_pmem(void __pmem *addr, size_t size)
-{
- if (size == PAGE_SIZE && ((unsigned long)addr & ~PAGE_MASK) == 0)
- clear_page((void __force *)addr);
- else
- memset((void __force *)addr, 0, size);
+ memcpy(dst, src, size);
+ return 0;
}
/**
* being effectively evicted from, or never written to, the processor
* cache hierarchy after the copy completes. After memcpy_to_pmem()
* data may still reside in cpu or platform buffers, so this operation
- * must be followed by a wmb_pmem().
+ * must be followed by a blkdev_issue_flush() on the pmem block device.
*/
-static inline void memcpy_to_pmem(void __pmem *dst, const void *src, size_t n)
+static inline void memcpy_to_pmem(void *dst, const void *src, size_t n)
{
if (arch_has_pmem_api())
arch_memcpy_to_pmem(dst, src, n);
else
- default_memcpy_to_pmem(dst, src, n);
-}
-
-/**
- * wmb_pmem - synchronize writes to persistent memory
- *
- * After a series of memcpy_to_pmem() operations this drains data from
- * cpu write buffers and any platform (memory controller) buffers to
- * ensure that written data is durable on persistent memory media.
- */
-static inline void wmb_pmem(void)
-{
- if (arch_has_wmb_pmem())
- arch_wmb_pmem();
- else
- wmb();
+ memcpy(dst, src, n);
}
/**
* @i: iterator with source data
*
* Copy data from the iterator 'i' to the PMEM buffer starting at 'addr'.
- * This function requires explicit ordering with a wmb_pmem() call.
+ * See blkdev_issue_flush() note for memcpy_to_pmem().
*/
-static inline size_t copy_from_iter_pmem(void __pmem *addr, size_t bytes,
+static inline size_t copy_from_iter_pmem(void *addr, size_t bytes,
struct iov_iter *i)
{
if (arch_has_pmem_api())
return arch_copy_from_iter_pmem(addr, bytes, i);
- return default_copy_from_iter_pmem(addr, bytes, i);
+ return copy_from_iter_nocache(addr, bytes, i);
}
/**
* @size: number of bytes to zero
*
* Write zeros into the memory range starting at 'addr' for 'size' bytes.
- * This function requires explicit ordering with a wmb_pmem() call.
+ * See blkdev_issue_flush() note for memcpy_to_pmem().
*/
-static inline void clear_pmem(void __pmem *addr, size_t size)
+static inline void clear_pmem(void *addr, size_t size)
{
if (arch_has_pmem_api())
arch_clear_pmem(addr, size);
else
- default_clear_pmem(addr, size);
+ memset(addr, 0, 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)
+static inline void invalidate_pmem(void *addr, size_t size)
{
if (arch_has_pmem_api())
arch_invalidate_pmem(addr, size);
* @size: number of bytes to write back
*
* Write back the processor cache range starting at 'addr' for 'size' bytes.
- * This function requires explicit ordering with a wmb_pmem() call.
+ * See blkdev_issue_flush() note for memcpy_to_pmem().
*/
-static inline void wb_cache_pmem(void __pmem *addr, size_t size)
+static inline void wb_cache_pmem(void *addr, size_t size)
{
if (arch_has_pmem_api())
arch_wb_cache_pmem(addr, size);
projects / karo-tx-linux.git / blobdiff