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From 203f17906ff45705fbdaa0430dbbc71142c2640f Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Sat, 8 Dec 2018 21:45:53 +0100
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Subject: [PATCH 1/3] MIPS: Compile post DMA flush only when needed
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dma_sync_phys() is only called for some CPUs when a mapping is removed.
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Add ARCH_HAS_SYNC_DMA_FOR_CPU only for the CPUs listed in
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cpu_needs_post_dma_flush() which need this extra call and do not compile
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this code in for other CPUs. We need this for R10000, R12000, BMIPS5000
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CPUs and CPUs supporting MAAR which was introduced in MIPS32r5.
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This will hopefully improve the performance of the not affected devices.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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arch/mips/Kconfig | 6 +++++-
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arch/mips/mm/dma-noncoherent.c | 2 ++
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2 files changed, 7 insertions(+), 1 deletion(-)
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -1117,7 +1117,6 @@ config DMA_PERDEV_COHERENT
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config DMA_NONCOHERENT
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bool
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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- select ARCH_HAS_SYNC_DMA_FOR_CPU
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select NEED_DMA_MAP_STATE
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select DMA_NONCOHERENT_MMAP
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select DMA_NONCOHERENT_CACHE_SYNC
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@@ -1898,9 +1897,11 @@ config SYS_HAS_CPU_MIPS32_R3_5
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config SYS_HAS_CPU_MIPS32_R5
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bool
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+ select ARCH_HAS_SYNC_DMA_FOR_CPU
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config SYS_HAS_CPU_MIPS32_R6
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bool
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+ select ARCH_HAS_SYNC_DMA_FOR_CPU
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config SYS_HAS_CPU_MIPS64_R1
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bool
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@@ -1910,6 +1911,7 @@ config SYS_HAS_CPU_MIPS64_R2
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config SYS_HAS_CPU_MIPS64_R6
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bool
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+ select ARCH_HAS_SYNC_DMA_FOR_CPU
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config SYS_HAS_CPU_R3000
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bool
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@@ -1946,6 +1948,7 @@ config SYS_HAS_CPU_R8000
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config SYS_HAS_CPU_R10000
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bool
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+ select ARCH_HAS_SYNC_DMA_FOR_CPU
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config SYS_HAS_CPU_RM7000
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bool
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@@ -1974,6 +1977,7 @@ config SYS_HAS_CPU_BMIPS4380
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config SYS_HAS_CPU_BMIPS5000
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bool
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select SYS_HAS_CPU_BMIPS
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+ select ARCH_HAS_SYNC_DMA_FOR_CPU
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config SYS_HAS_CPU_XLR
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bool
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--- a/arch/mips/mm/dma-noncoherent.c
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+++ b/arch/mips/mm/dma-noncoherent.c
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@@ -191,12 +191,14 @@ void arch_sync_dma_for_device(struct dev
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dma_sync_phys(paddr, size, dir);
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}
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+#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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if (cpu_needs_post_dma_flush(dev))
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dma_sync_phys(paddr, size, dir);
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}
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+#endif
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void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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