From 7c8a6a71904d57ae5fb24140f9661ec22ca9ee85 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 1 Jun 2016 23:07:43 -0700 Subject: pmem: kill wmb_pmem() All users have been replaced with flushing in the pmem driver. Cc: Ross Zwisler Signed-off-by: Dan Williams --- include/linux/pmem.h | 47 ++++------------------------------------------- 1 file changed, 4 insertions(+), 43 deletions(-) (limited to 'include') diff --git a/include/linux/pmem.h b/include/linux/pmem.h index 57d146f..9e3ea94 100644 --- a/include/linux/pmem.h +++ b/include/linux/pmem.h @@ -26,16 +26,6 @@ * 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) { @@ -101,20 +91,6 @@ static inline int memcpy_from_pmem(void *dst, void __pmem const *src, 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. @@ -152,7 +128,7 @@ static inline void default_clear_pmem(void __pmem *addr, size_t size) * 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) { @@ -163,28 +139,13 @@ static inline void memcpy_to_pmem(void __pmem *dst, const void *src, size_t 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(); -} - -/** * copy_from_iter_pmem - copy data from an iterator to PMEM * @addr: PMEM destination address * @bytes: number of bytes to copy * @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, struct iov_iter *i) @@ -200,7 +161,7 @@ static inline size_t copy_from_iter_pmem(void __pmem *addr, size_t bytes, * @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) { @@ -230,7 +191,7 @@ static inline void invalidate_pmem(void __pmem *addr, size_t 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) { -- cgit v1.1