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See http://www.infradead.org/rpr.html X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Shawn Anastasio , Will Deacon , linux-m68k@lists.linux-m68k.org, Guan Xuetao , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Russell King , linux-mips@vger.kernel.org, Paul Burton , Geert Uytterhoeven , Catalin Marinas , James Hogan , Robin Murphy , linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Mips uses the KSEG1 kernel memory segment do map dma coherent allocations for non-coherent devices as uncachable, and does not have any kind of special support for DMA_ATTR_WRITE_COMBINE in the allocation path. Thus supporting DMA_ATTR_WRITE_COMBINE in dma_mmap_attrs will lead to multiple mappings with different caching attributes. Fixes: 8c172467be36 ("MIPS: Add implementation of dma_map_ops.mmap()") Signed-off-by: Christoph Hellwig --- arch/mips/Kconfig | 1 - arch/mips/mm/dma-noncoherent.c | 8 -------- 2 files changed, 9 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index d50fafd7bf3a..86e6760ef0d0 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1119,7 +1119,6 @@ config DMA_PERDEV_COHERENT config DMA_NONCOHERENT bool - select ARCH_HAS_DMA_MMAP_PGPROT select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_HAS_UNCACHED_SEGMENT select NEED_DMA_MAP_STATE diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c index ed56c6fa7be2..1d4d57dd9acf 100644 --- a/arch/mips/mm/dma-noncoherent.c +++ b/arch/mips/mm/dma-noncoherent.c @@ -65,14 +65,6 @@ long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, return page_to_pfn(virt_to_page(cached_kernel_address(cpu_addr))); } -pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot, - unsigned long attrs) -{ - if (attrs & DMA_ATTR_WRITE_COMBINE) - return pgprot_writecombine(prot); - return pgprot_noncached(prot); -} - static inline void dma_sync_virt(void *addr, size_t size, enum dma_data_direction dir) { -- 2.20.1