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Merge branch 'libnvdimm-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

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Pull nvdimm mcsafe_memcpy use from Dan Williams:
 "Now that mcsafe_memcpy() has landed, and the return value was been
  clarified in commit cbf8b5a2b6 ("x86/mm, x86/mce: Fix return
  type/value for memcpy_mcsafe()"), let's hook up its primary usage in
  the pmem driver.

  The compilation problems from the initial posting have been fixed,
  this has appeared in a -next release with no reported issues, and it
  picked up an ack from Ingo.  There is no pressing need to merge this
  in 4.6- rc2.  However, if we wait until 4.7 the new memcpy_mcsafe()
  capability will ship without a user in 4.6-final"

* 'libnvdimm-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  x86, pmem: use memcpy_mcsafe() for memcpy_from_pmem()
This commit is contained in:
Linus Torvalds 2016-03-31 06:56:50 -05:00
commit c5bce408e4
3 changed files with 27 additions and 8 deletions
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9
arch/x86/include/asm/pmem.h
View File

@ -47,6 +47,15 @@ static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
BUG();
}
static inline int arch_memcpy_from_pmem(void *dst, const void __pmem *src,
size_t n)
{
if (static_cpu_has(X86_FEATURE_MCE_RECOVERY))
return memcpy_mcsafe(dst, (void __force *) src, n);
memcpy(dst, (void __force *) src, n);
return 0;
}
/**
* arch_wmb_pmem - synchronize writes to persistent memory
*

4
drivers/nvdimm/pmem.c
View File

@ -99,7 +99,7 @@ static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
if (unlikely(bad_pmem))
rc = -EIO;
else {
memcpy_from_pmem(mem + off, pmem_addr, len);
rc = memcpy_from_pmem(mem + off, pmem_addr, len);
flush_dcache_page(page);
}
} else {
@ -295,7 +295,7 @@ static int pmem_rw_bytes(struct nd_namespace_common *ndns,
if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align)))
return -EIO;
memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
return memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
} else {
memcpy_to_pmem(pmem->virt_addr + offset, buf, size);
wmb_pmem();

22
include/linux/pmem.h
View File

@ -42,6 +42,13 @@ static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
BUG();
}
static inline int arch_memcpy_from_pmem(void *dst, const void __pmem *src,
size_t n)
{
BUG();
return -EFAULT;
}
static inline size_t arch_copy_from_iter_pmem(void __pmem *addr, size_t bytes,
struct iov_iter *i)
{
@ -66,14 +73,17 @@ static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
#endif
/*
* Architectures that define ARCH_HAS_PMEM_API must provide
* implementations for arch_memcpy_to_pmem(), arch_wmb_pmem(),
* arch_copy_from_iter_pmem(), arch_clear_pmem(), arch_wb_cache_pmem()
* and arch_has_wmb_pmem().
* memcpy_from_pmem - read from persistent memory with error handling
* @dst: destination buffer
* @src: source buffer
* @size: transfer length
*
* Returns 0 on success negative error code on failure.
*/
static inline void memcpy_from_pmem(void *dst, void __pmem const *src, size_t size)
static inline int memcpy_from_pmem(void *dst, void __pmem const *src,
size_t size)
{
memcpy(dst, (void __force const *) src, size);
return arch_memcpy_from_pmem(dst, src, size);
}
static inline bool arch_has_pmem_api(void)