Unverified Commit f263f2a2 authored by Hauke Mehrtens's avatar Hauke Mehrtens Committed by Paul Burton
Browse files

MIPS: Compile post DMA flush only when needed 



dma_sync_phys() is only called for some CPUs when a mapping is removed.
Add ARCH_HAS_SYNC_DMA_FOR_CPU only for the CPUs listed in
cpu_needs_post_dma_flush() which need this extra call and do not compile
this code in for other CPUs. We need this for R10000, R12000, BMIPS5000
CPUs and CPUs supporting MAAR which was introduced in MIPS32r5.

This will hopefully improve the performance of the not affected devices.

Signed-off-by: default avatarHauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Cc: ralf@linux-mips.org
Cc: jhogan@kernel.org
Cc: linux-mips@vger.kernel.org
Cc: nbd@nbd.name
parent 1c7fc5cb

arch/mips/Kconfig

+5 −1
Original line number Diff line number Diff line
@@ -1124,7 +1124,6 @@ config DMA_NONCOHERENT 
	bool

	select ARCH_HAS_DMA_MMAP_PGPROT

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select NEED_DMA_MAP_STATE

	select ARCH_HAS_DMA_COHERENT_TO_PFN

	select DMA_NONCOHERENT_CACHE_SYNC
@@ -1928,9 +1927,11 @@ config SYS_HAS_CPU_MIPS32_R3_5 


config SYS_HAS_CPU_MIPS32_R5

	bool

	select ARCH_HAS_SYNC_DMA_FOR_CPU



config SYS_HAS_CPU_MIPS32_R6

	bool

	select ARCH_HAS_SYNC_DMA_FOR_CPU



config SYS_HAS_CPU_MIPS64_R1

	bool
@@ -1940,6 +1941,7 @@ config SYS_HAS_CPU_MIPS64_R2 


config SYS_HAS_CPU_MIPS64_R6

	bool

	select ARCH_HAS_SYNC_DMA_FOR_CPU



config SYS_HAS_CPU_R3000

	bool
@@ -1976,6 +1978,7 @@ config SYS_HAS_CPU_R8000 


config SYS_HAS_CPU_R10000

	bool

	select ARCH_HAS_SYNC_DMA_FOR_CPU



config SYS_HAS_CPU_RM7000

	bool
@@ -2004,6 +2007,7 @@ config SYS_HAS_CPU_BMIPS4380 
config SYS_HAS_CPU_BMIPS5000

	bool

	select SYS_HAS_CPU_BMIPS

	select ARCH_HAS_SYNC_DMA_FOR_CPU



config SYS_HAS_CPU_XLR

	bool

arch/mips/mm/dma-noncoherent.c

+2 −0
Original line number Diff line number Diff line
@@ -145,12 +145,14 @@ void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, 
	dma_sync_phys(paddr, size, dir);

}



#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU

void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	if (cpu_needs_post_dma_flush(dev))

		dma_sync_phys(paddr, size, dir);

}

#endif



void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,

		enum dma_data_direction direction)

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