From 4f8232bbf887123f78bcdca3dfd2b3dfa52a0112 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 21 Feb 2020 12:24:02 -0800 Subject: dma-direct: remove the cached_kernel_address hook dma-direct now finds the kernel address for coherent allocations based on the dma address, so the cached_kernel_address hooks is unused and can be removed entirely. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy --- arch/Kconfig | 2 +- arch/microblaze/mm/consistent.c | 7 ------- arch/mips/mm/dma-noncoherent.c | 5 ----- arch/nios2/mm/dma-mapping.c | 10 ---------- arch/xtensa/kernel/pci-dma.c | 10 ++-------- include/linux/dma-noncoherent.h | 1 - 6 files changed, 3 insertions(+), 32 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 98de654b79b3..7994b239f155 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -249,7 +249,7 @@ config ARCH_HAS_SET_DIRECT_MAP # # Select if arch has an uncached kernel segment and provides the -# uncached_kernel_address / cached_kernel_address symbols to use it +# uncached_kernel_address symbol to use it # config ARCH_HAS_UNCACHED_SEGMENT select ARCH_HAS_DMA_PREP_COHERENT diff --git a/arch/microblaze/mm/consistent.c b/arch/microblaze/mm/consistent.c index 8c5f0c332d8b..cede7c5e8135 100644 --- a/arch/microblaze/mm/consistent.c +++ b/arch/microblaze/mm/consistent.c @@ -49,11 +49,4 @@ void *uncached_kernel_address(void *ptr) pr_warn("ERROR: Your cache coherent area is CACHED!!!\n"); return (void *)addr; } - -void *cached_kernel_address(void *ptr) -{ - unsigned long addr = (unsigned long)ptr; - - return (void *)(addr & ~UNCACHED_SHADOW_MASK); -} #endif /* CONFIG_MMU */ diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c index dc42ffc83825..77dce28ad0a0 100644 --- a/arch/mips/mm/dma-noncoherent.c +++ b/arch/mips/mm/dma-noncoherent.c @@ -54,11 +54,6 @@ void *uncached_kernel_address(void *addr) return (void *)(__pa(addr) + UNCAC_BASE); } -void *cached_kernel_address(void *addr) -{ - return __va(addr) - UNCAC_BASE; -} - static inline void dma_sync_virt(void *addr, size_t size, enum dma_data_direction dir) { diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c index 0ed711e37902..f30f2749257c 100644 --- a/arch/nios2/mm/dma-mapping.c +++ b/arch/nios2/mm/dma-mapping.c @@ -75,13 +75,3 @@ void *uncached_kernel_address(void *ptr) return (void *)ptr; } - -void *cached_kernel_address(void *ptr) -{ - unsigned long addr = (unsigned long)ptr; - - addr &= ~CONFIG_NIOS2_IO_REGION_BASE; - addr |= CONFIG_NIOS2_KERNEL_REGION_BASE; - - return (void *)ptr; -} diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c index 72b6222daa0b..6a685545d5c9 100644 --- a/arch/xtensa/kernel/pci-dma.c +++ b/arch/xtensa/kernel/pci-dma.c @@ -88,18 +88,12 @@ void arch_dma_prep_coherent(struct page *page, size_t size) /* * Memory caching is platform-dependent in noMMU xtensa configurations. - * The following two functions should be implemented in platform code - * in order to enable coherent DMA memory operations when CONFIG_MMU is not - * enabled. + * This function should be implemented in platform code in order to enable + * coherent DMA memory operations when CONFIG_MMU is not enabled. */ #ifdef CONFIG_MMU void *uncached_kernel_address(void *p) { return p + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR; } - -void *cached_kernel_address(void *p) -{ - return p + XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR; -} #endif /* CONFIG_MMU */ diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h index ca9b5770caee..b6b72e19b0cd 100644 --- a/include/linux/dma-noncoherent.h +++ b/include/linux/dma-noncoherent.h @@ -109,6 +109,5 @@ static inline void arch_dma_prep_coherent(struct page *page, size_t size) #endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */ void *uncached_kernel_address(void *addr); -void *cached_kernel_address(void *addr); #endif /* _LINUX_DMA_NONCOHERENT_H */ -- cgit v1.2.3