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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-11-18 22:48:45 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-11-24 16:42:09 +0300 |
| commit | e66f6e095486f0210fcf3c5eb3ecf13fa348be4c (patch) | |
| tree | 521b26c86915c33349308c604a3963fa74d5624b /include/linux/io-mapping.h | |
| parent | f3ba3c710ac5a30cd058615a9eb62d2ad95bb782 (diff) | |
| download | linux-e66f6e095486f0210fcf3c5eb3ecf13fa348be4c.tar.xz | |
io-mapping: Provide iomap_local variant
Similar to kmap local provide a iomap local variant which only disables
migration, but neither disables pagefaults nor preemption.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20201118204007.561220818@linutronix.de
Diffstat (limited to 'include/linux/io-mapping.h')
| -rw-r--r-- | include/linux/io-mapping.h | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h index 60e7c83e4904..c093e81310a9 100644 --- a/include/linux/io-mapping.h +++ b/include/linux/io-mapping.h @@ -83,6 +83,21 @@ io_mapping_unmap_atomic(void __iomem *vaddr) } static inline void __iomem * +io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) +{ + resource_size_t phys_addr; + + BUG_ON(offset >= mapping->size); + phys_addr = mapping->base + offset; + return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot); +} + +static inline void io_mapping_unmap_local(void __iomem *vaddr) +{ + kunmap_local_indexed((void __force *)vaddr); +} + +static inline void __iomem * io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset, unsigned long size) @@ -101,7 +116,7 @@ io_mapping_unmap(void __iomem *vaddr) iounmap(vaddr); } -#else +#else /* HAVE_ATOMIC_IOMAP */ #include <linux/uaccess.h> @@ -166,7 +181,18 @@ io_mapping_unmap_atomic(void __iomem *vaddr) preempt_enable(); } -#endif /* HAVE_ATOMIC_IOMAP */ +static inline void __iomem * +io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) +{ + return io_mapping_map_wc(mapping, offset, PAGE_SIZE); +} + +static inline void io_mapping_unmap_local(void __iomem *vaddr) +{ + io_mapping_unmap(vaddr); +} + +#endif /* !HAVE_ATOMIC_IOMAP */ static inline struct io_mapping * io_mapping_create_wc(resource_size_t base, |