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io-mapping: Cleanup atomic iomap

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Switch the atomic iomap implementation over to kmap_local and stick the
preempt/pagefault mechanics into the generic code similar to the
kmap_atomic variants.

Rename the x86 map function in preparation for a non-atomic variant.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20201103095858.625310005@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-11-03 10:27:32 +01:00
parent 3c1016b53c
commit 351191ad55
3 changed files with 9 additions and 14 deletions
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9
arch/x86/include/asm/iomap.h
View File

@ -13,14 +13,7 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot);
static inline void iounmap_atomic(void __iomem *vaddr)
{
kunmap_local_indexed((void __force *)vaddr);
pagefault_enable();
preempt_enable();
}
void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot);

6
arch/x86/mm/iomap_32.c
View File

@ -44,7 +44,7 @@ void iomap_free(resource_size_t base, unsigned long size)
}
EXPORT_SYMBOL_GPL(iomap_free);
void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot)
void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot)
{
/*
* For non-PAT systems, translate non-WB request to UC- just in
@ -60,8 +60,6 @@ void __iomem *iomap_atomic_pfn_prot(unsigned long pfn, pgprot_t prot)
/* Filter out unsupported __PAGE_KERNEL* bits: */
pgprot_val(prot) &= __default_kernel_pte_mask;
preempt_disable();
pagefault_disable();
return (void __force __iomem *)__kmap_local_pfn_prot(pfn, prot);
}
EXPORT_SYMBOL_GPL(iomap_atomic_pfn_prot);
EXPORT_SYMBOL_GPL(__iomap_local_pfn_prot);

8
include/linux/io-mapping.h
View File

@ -69,13 +69,17 @@ io_mapping_map_atomic_wc(struct io_mapping *mapping,
BUG_ON(offset >= mapping->size);
phys_addr = mapping->base + offset;
return iomap_atomic_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
preempt_disable();
pagefault_disable();
return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
}
static inline void
io_mapping_unmap_atomic(void __iomem *vaddr)
{
iounmap_atomic(vaddr);
kunmap_local_indexed((void __force *)vaddr);
pagefault_enable();
preempt_enable();
}
static inline void __iomem *