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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
This commit is contained in:
Hauke Mehrtens 2018-12-09 16:49:57 +01:00 committed by Paul Burton
parent 1c7fc5cbc3
commit f263f2a2c6
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
2 changed files with 7 additions and 1 deletions
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6
arch/mips/Kconfig
View File

@ -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

2
arch/mips/mm/dma-noncoherent.c
View File

@ -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)