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Subject[PATCH 10/10] pmem: convert to generic memremap
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Update memremap_pmem() to query the architecture for the mapping type of
the given persistent memory range and then pass those flags to generic
memremap(). arch_memremap_pmem_flags() is provided an address range to
evaluate in the event an arch has a need for different mapping types by
address range. For example the ACPI NFIT carries EFI mapping types in
its memory range description table.

Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/x86/include/asm/io.h | 7 +------
arch/x86/mm/ioremap.c | 10 ++++++++++
drivers/nvdimm/pmem.c | 2 +-
include/linux/pmem.h | 29 ++++++++++++++---------------
tools/testing/nvdimm/Kbuild | 4 ++--
tools/testing/nvdimm/test/iomap.c | 34 +++++++++++++++++++++++++---------
6 files changed, 53 insertions(+), 33 deletions(-)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index d0817f2762ab..3ca5d45b52b8 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -250,12 +250,7 @@ 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);
-}
-
+unsigned long arch_memremap_pmem_flags(resource_size_t offset, size_t size);
#endif /* __KERNEL__ */

extern void native_io_delay(void);
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 4920f735f551..640e4c334836 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -203,6 +203,16 @@ err_free_memtype:
return NULL;
}

+unsigned long arch_memremap_pmem_flags(resource_size_t offset, size_t size)
+{
+ /*
+ * TODO: check the mapping type provided by platform firmware,
+ * per range.
+ */
+ return MEMREMAP_CACHE | MEMREMAP_STRICT;
+}
+EXPORT_SYMBOL(arch_memremap_pmem_flags);
+
/**
* ioremap_nocache - map bus memory into CPU space
* @phys_addr: bus address of the memory
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index ade9eb917a4d..bdc35110783f 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -211,7 +211,7 @@ static int pmem_rw_bytes(struct nd_namespace_common *ndns,

static void pmem_free(struct pmem_device *pmem)
{
- memunmap_pmem(pmem->virt_addr);
+ memunmap(pmem->virt_addr);
release_mem_region(pmem->phys_addr, pmem->size);
kfree(pmem);
}
diff --git a/include/linux/pmem.h b/include/linux/pmem.h
index d2114045a6c4..28a0b989f46d 100644
--- a/include/linux/pmem.h
+++ b/include/linux/pmem.h
@@ -28,10 +28,10 @@ static inline bool __arch_has_wmb_pmem(void)
return false;
}

-static inline void __pmem *arch_memremap_pmem(resource_size_t offset,
+static inline unsigned long arch_memremap_pmem_flags(resource_size_t offset,
unsigned long size)
{
- return NULL;
+ return 0;
}

static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
@@ -43,8 +43,8 @@ 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_memremap_pmem_flags(),
+ * 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)
@@ -52,11 +52,6 @@ static inline void memcpy_from_pmem(void *dst, void __pmem const *src, size_t si
memcpy(dst, (void __force const *) src, size);
}

-static inline void memunmap_pmem(void __pmem *addr)
-{
- iounmap((void __force __iomem *) addr);
-}
-
/**
* arch_has_wmb_pmem - true if wmb_pmem() ensures durability
*
@@ -85,16 +80,15 @@ 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)
+static inline unsigned long default_memremap_pmem_flags(void)
{
- return (void __pmem __force *)ioremap_wt(offset, size);
+ return MEMREMAP_WT | MEMREMAP_STRICT;
}

/**
@@ -112,9 +106,14 @@ static void __pmem *default_memremap_pmem(resource_size_t offset,
static inline void __pmem *memremap_pmem(resource_size_t offset,
unsigned long size)
{
+ unsigned long flags;
+
if (arch_has_pmem_api())
- return arch_memremap_pmem(offset, size);
- return default_memremap_pmem(offset, size);
+ flags = arch_memremap_pmem_flags(offset, size);
+ else
+ flags = default_memremap_pmem_flags();
+
+ return (void __pmem *) memremap(offset, size, flags);
}

/**
diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild
index f56914c7929b..8c0f9fc72d6e 100644
--- a/tools/testing/nvdimm/Kbuild
+++ b/tools/testing/nvdimm/Kbuild
@@ -1,9 +1,9 @@
-ldflags-y += --wrap=ioremap_wt
ldflags-y += --wrap=ioremap_wc
ldflags-y += --wrap=devm_ioremap_nocache
-ldflags-y += --wrap=ioremap_cache
ldflags-y += --wrap=ioremap_nocache
ldflags-y += --wrap=iounmap
+ldflags-y += --wrap=memremap
+ldflags-y += --wrap=memunmap
ldflags-y += --wrap=__request_region
ldflags-y += --wrap=__release_region

diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index 64bfaa50831c..21288f34a5ca 100644
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -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)


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