Commit 4f8232bb authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

dma-direct: remove the cached_kernel_address hook 



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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
parent 286c21de

arch/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/microblaze/mm/consistent.c

+0 −7
Original line number Diff line number Diff line
@@ -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 */

arch/mips/mm/dma-noncoherent.c

+0 −5
Original line number Diff line number Diff line
@@ -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)

{

arch/nios2/mm/dma-mapping.c

+0 −10
Original line number Diff line number Diff line
@@ -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;

}

arch/xtensa/kernel/pci-dma.c

+2 −8
Original line number Diff line number Diff line
@@ -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 */