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-rw-r--r--arch/x86/Kconfig2
-rw-r--r--arch/x86/include/asm/pmem.h9
-rw-r--r--drivers/acpi/nfit.c3
-rw-r--r--drivers/nvdimm/pmem.c2
-rw-r--r--include/linux/pmem.h36
5 files changed, 27 insertions, 25 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 03ab6122325a..ef4c6bbb3af1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -27,7 +27,7 @@ config X86
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_GCOV_PROFILE_ALL
- select ARCH_HAS_PMEM_API
+ select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_MMIO_FLUSH
select ARCH_HAS_SG_CHAIN
select ARCH_HAVE_NMI_SAFE_CMPXCHG
diff --git a/arch/x86/include/asm/pmem.h b/arch/x86/include/asm/pmem.h
index bb026c5adf8a..d8ce3ec816ab 100644
--- a/arch/x86/include/asm/pmem.h
+++ b/arch/x86/include/asm/pmem.h
@@ -18,8 +18,6 @@
#include <asm/cpufeature.h>
#include <asm/special_insns.h>
-#define ARCH_MEMREMAP_PMEM MEMREMAP_WB
-
#ifdef CONFIG_ARCH_HAS_PMEM_API
/**
* arch_memcpy_to_pmem - copy data to persistent memory
@@ -143,18 +141,13 @@ static inline void arch_clear_pmem(void __pmem *addr, size_t size)
__arch_wb_cache_pmem(vaddr, size);
}
-static inline bool arch_has_wmb_pmem(void)
+static inline bool __arch_has_wmb_pmem(void)
{
-#ifdef CONFIG_X86_64
/*
* We require that wmb() be an 'sfence', that is only guaranteed on
* 64-bit builds
*/
return static_cpu_has(X86_FEATURE_PCOMMIT);
-#else
- return false;
-#endif
}
#endif /* CONFIG_ARCH_HAS_PMEM_API */
-
#endif /* __ASM_X86_PMEM_H__ */
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 56fff0141636..f61e69fa2ad1 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -20,6 +20,7 @@
#include <linux/sort.h>
#include <linux/pmem.h>
#include <linux/io.h>
+#include <asm/cacheflush.h>
#include "nfit.h"
/*
@@ -1371,7 +1372,7 @@ static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
return -ENOMEM;
}
- if (!arch_has_pmem_api() && !nfit_blk->nvdimm_flush)
+ if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
dev_warn(dev, "unable to guarantee persistence of writes\n");
if (mmio->line_size == 0)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 3b5b9cb758b6..20bf122328da 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -125,7 +125,7 @@ static struct pmem_device *pmem_alloc(struct device *dev,
pmem->phys_addr = res->start;
pmem->size = resource_size(res);
- if (!arch_has_pmem_api())
+ if (!arch_has_wmb_pmem())
dev_warn(dev, "unable to guarantee persistence of writes\n");
if (!devm_request_mem_region(dev, pmem->phys_addr, pmem->size,
diff --git a/include/linux/pmem.h b/include/linux/pmem.h
index a9d84bf335ee..85f810b33917 100644
--- a/include/linux/pmem.h
+++ b/include/linux/pmem.h
@@ -17,16 +17,23 @@
#include <linux/uio.h>
#ifdef CONFIG_ARCH_HAS_PMEM_API
+#define ARCH_MEMREMAP_PMEM MEMREMAP_WB
#include <asm/pmem.h>
#else
-static inline void arch_wmb_pmem(void)
+#define ARCH_MEMREMAP_PMEM MEMREMAP_WT
+/*
+ * These are simply here to enable compilation, all call sites gate
+ * 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)
{
- BUG();
+ return false;
}
-static inline bool arch_has_wmb_pmem(void)
+static inline void arch_wmb_pmem(void)
{
- return false;
+ BUG();
}
static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
@@ -53,7 +60,6 @@ static inline void arch_clear_pmem(void __pmem *addr, size_t size)
* implementations for arch_memcpy_to_pmem(), arch_wmb_pmem(),
* arch_copy_from_iter_pmem(), arch_clear_pmem() and arch_has_wmb_pmem().
*/
-
static inline void memcpy_from_pmem(void *dst, void __pmem const *src, size_t size)
{
memcpy(dst, (void __force const *) src, size);
@@ -64,8 +70,13 @@ static inline void memunmap_pmem(struct device *dev, void __pmem *addr)
devm_memunmap(dev, (void __force *) addr);
}
+static inline bool arch_has_pmem_api(void)
+{
+ return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
+}
+
/**
- * arch_has_pmem_api - true if wmb_pmem() ensures durability
+ * 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
@@ -73,9 +84,9 @@ static inline void memunmap_pmem(struct device *dev, void __pmem *addr)
* fall back to a different data consistency model, or otherwise notify
* the user.
*/
-static inline bool arch_has_pmem_api(void)
+static inline bool arch_has_wmb_pmem(void)
{
- return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API) && arch_has_wmb_pmem();
+ return arch_has_pmem_api() && __arch_has_wmb_pmem();
}
/*
@@ -120,13 +131,8 @@ static inline void default_clear_pmem(void __pmem *addr, size_t size)
static inline void __pmem *memremap_pmem(struct device *dev,
resource_size_t offset, unsigned long size)
{
-#ifdef ARCH_MEMREMAP_PMEM
return (void __pmem *) devm_memremap(dev, offset, size,
ARCH_MEMREMAP_PMEM);
-#else
- return (void __pmem *) devm_memremap(dev, offset, size,
- MEMREMAP_WT);
-#endif
}
/**
@@ -158,8 +164,10 @@ static inline void memcpy_to_pmem(void __pmem *dst, const void *src, size_t n)
*/
static inline void wmb_pmem(void)
{
- if (arch_has_pmem_api())
+ if (arch_has_wmb_pmem())
arch_wmb_pmem();
+ else
+ wmb();
}
/**