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io-mapping: Provide iomap_local variant

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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
This commit is contained in:
Thomas Gleixner 2020-11-18 20:48:45 +01:00
parent f3ba3c710a
commit e66f6e0954
2 changed files with 73 additions and 31 deletions
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30
include/linux/io-mapping.h
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@ -82,6 +82,21 @@ io_mapping_unmap_atomic(void __iomem *vaddr)
preempt_enable();
}
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,
@ -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,