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pmem: convert to generic memremap 

Kill arch_memremap_pmem() and just let the architecture specify the
flags to be passed to memremap().  Default to writethrough by default.

Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2015-08-12 18:42:56 -04:00
parent 3103dc0304
commit e836a256e8
4 changed files with 37 additions and 35 deletions
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6
arch/x86/include/asm/io.h
View File

@ -248,11 +248,7 @@ static inline void flush_write_buffers(void)
#endif
}
static inline void __pmem *arch_memremap_pmem(resource_size_t offset,
unsigned long size)
{
return (void __force __pmem *) ioremap_cache(offset, size);
}
#define ARCH_MEMREMAP_PMEM MEMREMAP_WB
#endif /* __KERNEL__ */

28
include/linux/pmem.h
View File

@ -28,12 +28,6 @@ static inline bool __arch_has_wmb_pmem(void)
return false;
}
static inline void __pmem *arch_memremap_pmem(resource_size_t offset,
unsigned long size)
{
return NULL;
}
static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
size_t n)
{
@ -43,8 +37,8 @@ static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
/*
* Architectures that define ARCH_HAS_PMEM_API must provide
* implementations for arch_memremap_pmem(), arch_memcpy_to_pmem(),
* arch_wmb_pmem(), and __arch_has_wmb_pmem().
* implementations for arch_memcpy_to_pmem(), arch_wmb_pmem(), and
* __arch_has_wmb_pmem().
*/
static inline void memcpy_from_pmem(void *dst, void __pmem const *src, size_t size)
@ -54,7 +48,7 @@ static inline void memcpy_from_pmem(void *dst, void __pmem const *src, size_t si
static inline void memunmap_pmem(void __pmem *addr)
{
iounmap((void __force __iomem *) addr);
memunmap((void __force *) addr);
}
/**
@ -85,18 +79,12 @@ static inline bool arch_has_pmem_api(void)
* default_memremap_pmem + default_memcpy_to_pmem is sufficient for
* making data durable relative to i/o completion.
*/
static void default_memcpy_to_pmem(void __pmem *dst, const void *src,
static inline void default_memcpy_to_pmem(void __pmem *dst, const void *src,
size_t size)
{
memcpy((void __force *) dst, src, size);
}
static void __pmem *default_memremap_pmem(resource_size_t offset,
unsigned long size)
{
return (void __pmem __force *)ioremap_wt(offset, size);
}
/**
* memremap_pmem - map physical persistent memory for pmem api
* @offset: physical address of persistent memory
@ -112,9 +100,11 @@ static void __pmem *default_memremap_pmem(resource_size_t offset,
static inline void __pmem *memremap_pmem(resource_size_t offset,
unsigned long size)
{
if (arch_has_pmem_api())
return arch_memremap_pmem(offset, size);
return default_memremap_pmem(offset, size);
#ifdef ARCH_MEMREMAP_PMEM
return (void __pmem *) memremap(offset, size, ARCH_MEMREMAP_PMEM);
#else
return (void __pmem *) memremap(offset, size, MEMREMAP_WT);
#endif
}
/**

4
tools/testing/nvdimm/Kbuild
View File

@ -1,7 +1,7 @@
ldflags-y += --wrap=ioremap_wt
ldflags-y += --wrap=ioremap_wc
ldflags-y += --wrap=devm_ioremap_nocache
ldflags-y += --wrap=ioremap_cache
ldflags-y += --wrap=memremap
ldflags-y += --wrap=memunmap
ldflags-y += --wrap=ioremap_nocache
ldflags-y += --wrap=iounmap
ldflags-y += --wrap=__request_region

34
tools/testing/nvdimm/test/iomap.c
View File

@ -80,11 +80,20 @@ void __iomem *__wrap_devm_ioremap_nocache(struct device *dev,
}
EXPORT_SYMBOL(__wrap_devm_ioremap_nocache);
void __iomem *__wrap_ioremap_cache(resource_size_t offset, unsigned long size)
void *__wrap_memremap(resource_size_t offset, size_t size,
unsigned long flags)
{
return __nfit_test_ioremap(offset, size, ioremap_cache);
struct nfit_test_resource *nfit_res;
rcu_read_lock();
nfit_res = get_nfit_res(offset);
rcu_read_unlock();
if (nfit_res)
return (void __iomem *) nfit_res->buf + offset
- nfit_res->res->start;
return memremap(offset, size, flags);
}
EXPORT_SYMBOL(__wrap_ioremap_cache);
EXPORT_SYMBOL(__wrap_memremap);
void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
{
@ -92,12 +101,6 @@ void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
}
EXPORT_SYMBOL(__wrap_ioremap_nocache);
void __iomem *__wrap_ioremap_wt(resource_size_t offset, unsigned long size)
{
return __nfit_test_ioremap(offset, size, ioremap_wt);
}
EXPORT_SYMBOL(__wrap_ioremap_wt);
void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
{
return __nfit_test_ioremap(offset, size, ioremap_wc);
@ -117,6 +120,19 @@ void __wrap_iounmap(volatile void __iomem *addr)
}
EXPORT_SYMBOL(__wrap_iounmap);
void __wrap_memunmap(void *addr)
{
struct nfit_test_resource *nfit_res;
rcu_read_lock();
nfit_res = get_nfit_res((unsigned long) addr);
rcu_read_unlock();
if (nfit_res)
return;
return memunmap(addr);
}
EXPORT_SYMBOL(__wrap_memunmap);
struct resource *__wrap___request_region(struct resource *parent,
resource_size_t start, resource_size_t n, const char *name,
int flags)