Commit 2e96e04d authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

MIPS: use the generic uncached segment support in dma-direct 



Stop providing the arch alloc/free hooks and just expose the segment
offset instead.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarPaul Burton <paul.burton@mips.com>
parent c30700db

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ config MIPS 
	select ARCH_HAS_ELF_RANDOMIZE

	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

	select ARCH_HAS_UBSAN_SANITIZE_ALL

	select ARCH_HAS_UNCACHED_SEGMENT

	select ARCH_SUPPORTS_UPROBES

	select ARCH_USE_BUILTIN_BSWAP

	select ARCH_USE_CMPXCHG_LOCKREF if 64BIT

arch/mips/include/asm/page.h

+0 −3
Original line number Diff line number Diff line
@@ -258,9 +258,6 @@ extern int __virt_addr_valid(const volatile void *kaddr); 
	 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \

	 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)



#define UNCAC_ADDR(addr)	(UNCAC_BASE + __pa(addr))

#define CAC_ADDR(addr)		((unsigned long)__va((addr) - UNCAC_BASE))



#include <asm-generic/memory_model.h>

#include <asm-generic/getorder.h>

arch/mips/jazz/jazzdma.c

+0 −6
Original line number Diff line number Diff line
@@ -575,10 +575,6 @@ static void *jazz_dma_alloc(struct device *dev, size_t size, 
		return NULL;

	}



	if (!(attrs & DMA_ATTR_NON_CONSISTENT)) {

		dma_cache_wback_inv((unsigned long)ret, size);

		ret = (void *)UNCAC_ADDR(ret);

	}

	return ret;

}
@@ -586,8 +582,6 @@ static void jazz_dma_free(struct device *dev, size_t size, void *vaddr, 
		dma_addr_t dma_handle, unsigned long attrs)

{

	vdma_free(dma_handle);

	if (!(attrs & DMA_ATTR_NON_CONSISTENT))

		vaddr = (void *)CAC_ADDR((unsigned long)vaddr);

	dma_direct_free_pages(dev, size, vaddr, dma_handle, attrs);

}

arch/mips/mm/dma-noncoherent.c

+9 −17
Original line number Diff line number Diff line
@@ -44,33 +44,25 @@ static inline bool cpu_needs_post_dma_flush(struct device *dev) 
	}

}



void *arch_dma_alloc(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)

void arch_dma_prep_coherent(struct page *page, size_t size)

{

	void *ret;



	ret = dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);

	if (ret && !(attrs & DMA_ATTR_NON_CONSISTENT)) {

		dma_cache_wback_inv((unsigned long) ret, size);

		ret = (void *)UNCAC_ADDR(ret);

	dma_cache_wback_inv((unsigned long)page_address(page), size);

}



	return ret;

void *uncached_kernel_address(void *addr)

{

	return (void *)(__pa(addr) + UNCAC_BASE);

}



void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,

		dma_addr_t dma_addr, unsigned long attrs)

void *cached_kernel_address(void *addr)

{

	if (!(attrs & DMA_ATTR_NON_CONSISTENT))

		cpu_addr = (void *)CAC_ADDR((unsigned long)cpu_addr);

	dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);

	return __va(addr) - UNCAC_BASE;

}



long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,

		dma_addr_t dma_addr)

{

	unsigned long addr = CAC_ADDR((unsigned long)cpu_addr);

	return page_to_pfn(virt_to_page((void *)addr));

	return page_to_pfn(virt_to_page(cached_kernel_address(cpu_addr)));

}



pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,

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