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| author |   Hauke Mehrtens <hauke@hauke-m.de> | 2018-12-09 16:49:57 +0100 |
|---|---|---|
| committer |   Paul Burton <paul.burton@mips.com> | 2019-01-18 11:33:04 -0800 |
| commit | f263f2a2c682fddc7521a1d1efc01d58e1d70d84 (patch) | |
| tree | 1abbe858e7b711a3e25438cf716dfcf86d304dcd /arch/mips | |
| parent | Linux 5.0-rc2 (diff) | |
| download | linux-dev-f263f2a2c682fddc7521a1d1efc01d58e1d70d84.tar.xz linux-dev-f263f2a2c682fddc7521a1d1efc01d58e1d70d84.zip | |
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: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: ralf@linux-mips.org
Cc: jhogan@kernel.org
Cc: linux-mips@vger.kernel.org
Cc: nbd@nbd.name
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/Kconfig | 6 | ||||
| -rw-r--r-- | arch/mips/mm/dma-noncoherent.c | 2 |
2 files changed, 7 insertions, 1 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 787290781b8c..2406757790fb 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -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 diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c index cb38461391cb..f7e0fd6b7619 100644 --- a/arch/mips/mm/dma-noncoherent.c +++ b/arch/mips/mm/dma-noncoherent.c @@ -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) |