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.zwis...@linux.intel.com> Signed-off-by: Dan Williams <dan.j.willi...@intel.com> --- arch/x86/include/asm/io.h | 2 +- arch/x86/mm/ioremap.c | 16 ++++++++++------ include/linux/pmem.h | 26 +++++++++++++++----------- 3 files changed, 26 insertions(+), 18 deletions(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index bba4e8968bc7..1388d7d27775 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -253,7 +253,7 @@ static inline void flush_write_buffers(void) #endif } -void __pmem *arch_memremap_pmem(resource_size_t offset, size_t 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 987a58e84e2f..d4a67223f6e9 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -205,6 +205,16 @@ 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; +} +EXPORT_SYMBOL(arch_memremap_pmem_flags); + /** * ioremap_nocache - map bus memory into CPU space * @phys_addr: bus address of the memory @@ -310,12 +320,6 @@ void *arch_memremap(resource_size_t phys_addr, size_t size, } EXPORT_SYMBOL(arch_memremap); -void __pmem *arch_memremap_pmem(resource_size_t offset, size_t size) -{ - return (void __pmem *) arch_memremap(offset, size, MEMREMAP_CACHE); -} -EXPORT_SYMBOL(arch_memremap_pmem); - void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size, unsigned long prot_val) { diff --git a/include/linux/pmem.h b/include/linux/pmem.h index 1bf74c735fa0..03f9d73f3e13 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) @@ -54,7 +54,7 @@ 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); } /** @@ -85,16 +85,15 @@ 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 *) memremap(offset, size, MEMREMAP_WT); + return MEMREMAP_WT; } /** @@ -112,9 +111,14 @@ 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); } /** -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/