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dma-direct: remove the cached_kernel_address hook

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dma-direct now finds the kernel address for coherent allocations based
on the dma address, so the cached_kernel_address hooks is unused and
can be removed entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2020-02-21 12:24:02 -08:00
parent 286c21de32
commit 4f8232bbf8
6 changed files with 3 additions and 32 deletions
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2
arch/Kconfig
View File

@ -249,7 +249,7 @@ config ARCH_HAS_SET_DIRECT_MAP
#
# Select if arch has an uncached kernel segment and provides the
# uncached_kernel_address / cached_kernel_address symbols to use it
# uncached_kernel_address symbol to use it
#
config ARCH_HAS_UNCACHED_SEGMENT
select ARCH_HAS_DMA_PREP_COHERENT

7
arch/microblaze/mm/consistent.c
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@ -49,11 +49,4 @@ void *uncached_kernel_address(void *ptr)
pr_warn("ERROR: Your cache coherent area is CACHED!!!\n");
return (void *)addr;
}
void *cached_kernel_address(void *ptr)
{
unsigned long addr = (unsigned long)ptr;
return (void *)(addr & ~UNCACHED_SHADOW_MASK);
}
#endif /* CONFIG_MMU */

5
arch/mips/mm/dma-noncoherent.c
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@ -54,11 +54,6 @@ void *uncached_kernel_address(void *addr)
return (void *)(__pa(addr) + UNCAC_BASE);
}
void *cached_kernel_address(void *addr)
{
return __va(addr) - UNCAC_BASE;
}
static inline void dma_sync_virt(void *addr, size_t size,
enum dma_data_direction dir)
{

10
arch/nios2/mm/dma-mapping.c
View File

@ -75,13 +75,3 @@ void *uncached_kernel_address(void *ptr)
return (void *)ptr;
}
void *cached_kernel_address(void *ptr)
{
unsigned long addr = (unsigned long)ptr;
addr &= ~CONFIG_NIOS2_IO_REGION_BASE;
addr |= CONFIG_NIOS2_KERNEL_REGION_BASE;
return (void *)ptr;
}

10
arch/xtensa/kernel/pci-dma.c
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@ -88,18 +88,12 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
/*
* Memory caching is platform-dependent in noMMU xtensa configurations.
* The following two functions should be implemented in platform code
* in order to enable coherent DMA memory operations when CONFIG_MMU is not
* enabled.
* This function should be implemented in platform code in order to enable
* coherent DMA memory operations when CONFIG_MMU is not enabled.
*/
#ifdef CONFIG_MMU
void *uncached_kernel_address(void *p)
{
return p + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR;
}
void *cached_kernel_address(void *p)
{
return p + XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
}
#endif /* CONFIG_MMU */

1
include/linux/dma-noncoherent.h
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@ -109,6 +109,5 @@ static inline void arch_dma_prep_coherent(struct page *page, size_t size)
#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
void *uncached_kernel_address(void *addr);
void *cached_kernel_address(void *addr);
#endif /* _LINUX_DMA_NONCOHERENT_H */