From 28f512d9cb48ec09288e4cc4475d022d1745b7bf Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 15 Jun 2018 13:08:53 +0200 Subject: MIPS: remove the old dma-default implementation Now unused. Signed-off-by: Christoph Hellwig Patchwork: https://patchwork.linux-mips.org/patch/19551/ Signed-off-by: Paul Burton Cc: Florian Fainelli Cc: David Daney Cc: Kevin Cernekee Cc: Jiaxun Yang Cc: Tom Bogendoerfer Cc: Huacai Chen Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org --- arch/mips/Kconfig | 5 +- arch/mips/include/asm/dma-mapping.h | 3 - arch/mips/include/asm/mach-generic/dma-coherence.h | 73 ---- arch/mips/mm/Makefile | 1 - arch/mips/mm/dma-default.c | 379 --------------------- 5 files changed, 1 insertion(+), 460 deletions(-) delete mode 100644 arch/mips/include/asm/mach-generic/dma-coherence.h delete mode 100644 arch/mips/mm/dma-default.c diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 16542e0d18c7..33375dd234eb 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -78,9 +78,6 @@ config MIPS select SYSCTL_EXCEPTION_TRACE select VIRT_TO_BUS -config MIPS_DMA_DEFAULT - bool - menu "Machine selection" choice @@ -1119,7 +1116,7 @@ config DMA_NONCOHERENT select NEED_DMA_MAP_STATE select DMA_NONCOHERENT_MMAP select DMA_NONCOHERENT_CACHE_SYNC - select DMA_NONCOHERENT_OPS if !MIPS_DMA_DEFAULT + select DMA_NONCOHERENT_OPS config SYS_HAS_EARLY_PRINTK bool diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h index caf97f739897..143250986e17 100644 --- a/arch/mips/include/asm/dma-mapping.h +++ b/arch/mips/include/asm/dma-mapping.h @@ -11,7 +11,6 @@ #endif extern const struct dma_map_ops jazz_dma_ops; -extern const struct dma_map_ops mips_default_dma_map_ops; extern const struct dma_map_ops mips_swiotlb_ops; static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) @@ -20,8 +19,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) return &jazz_dma_ops; #elif defined(CONFIG_SWIOTLB) return &mips_swiotlb_ops; -#elif defined(CONFIG_MIPS_DMA_DEFAULT) - return &mips_default_dma_map_ops; #elif defined(CONFIG_DMA_NONCOHERENT_OPS) return &dma_noncoherent_ops; #else diff --git a/arch/mips/include/asm/mach-generic/dma-coherence.h b/arch/mips/include/asm/mach-generic/dma-coherence.h deleted file mode 100644 index 8ad7a40ca786..000000000000 --- a/arch/mips/include/asm/mach-generic/dma-coherence.h +++ /dev/null @@ -1,73 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2006 Ralf Baechle - * - */ -#ifndef __ASM_MACH_GENERIC_DMA_COHERENCE_H -#define __ASM_MACH_GENERIC_DMA_COHERENCE_H - -struct device; - -static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, - size_t size) -{ - return virt_to_phys(addr); -} - -static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, - struct page *page) -{ - return page_to_phys(page); -} - -static inline unsigned long plat_dma_addr_to_phys(struct device *dev, - dma_addr_t dma_addr) -{ - return dma_addr; -} - -static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr, - size_t size, enum dma_data_direction direction) -{ -} - -static inline int plat_dma_supported(struct device *dev, u64 mask) -{ - /* - * we fall back to GFP_DMA when the mask isn't all 1s, - * so we can't guarantee allocations that must be - * within a tighter range than GFP_DMA.. - */ - if (mask < DMA_BIT_MASK(24)) - return 0; - - return 1; -} - -static inline int plat_device_is_coherent(struct device *dev) -{ -#ifdef CONFIG_DMA_PERDEV_COHERENT - return dev->archdata.dma_coherent; -#else - switch (coherentio) { - default: - case IO_COHERENCE_DEFAULT: - return hw_coherentio; - case IO_COHERENCE_ENABLED: - return 1; - case IO_COHERENCE_DISABLED: - return 0; - } -#endif -} - -#ifndef plat_post_dma_flush -static inline void plat_post_dma_flush(struct device *dev) -{ -} -#endif - -#endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */ diff --git a/arch/mips/mm/Makefile b/arch/mips/mm/Makefile index c6146c3805dc..6922f393af19 100644 --- a/arch/mips/mm/Makefile +++ b/arch/mips/mm/Makefile @@ -17,7 +17,6 @@ obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o obj-$(CONFIG_64BIT) += pgtable-64.o obj-$(CONFIG_HIGHMEM) += highmem.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o -obj-$(CONFIG_MIPS_DMA_DEFAULT) += dma-default.o obj-$(CONFIG_DMA_NONCOHERENT) += dma-noncoherent.o obj-$(CONFIG_SWIOTLB) += dma-swiotlb.o diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c deleted file mode 100644 index 10b56e8a2076..000000000000 --- a/arch/mips/mm/dma-default.c +++ /dev/null @@ -1,379 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2000 Ani Joshi - * Copyright (C) 2000, 2001, 06 Ralf Baechle - * swiped from i386, and cloned for MIPS by Geert, polished by Ralf. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#include - -static inline struct page *dma_addr_to_page(struct device *dev, - dma_addr_t dma_addr) -{ - return pfn_to_page( - plat_dma_addr_to_phys(dev, dma_addr) >> PAGE_SHIFT); -} - -/* - * The affected CPUs below in 'cpu_needs_post_dma_flush()' can - * speculatively fill random cachelines with stale data at any time, - * requiring an extra flush post-DMA. - * - * Warning on the terminology - Linux calls an uncached area coherent; - * MIPS terminology calls memory areas with hardware maintained coherency - * coherent. - * - * Note that the R14000 and R16000 should also be checked for in this - * condition. However this function is only called on non-I/O-coherent - * systems and only the R10000 and R12000 are used in such systems, the - * SGI IP28 Indigo² rsp. SGI IP32 aka O2. - */ -static inline bool cpu_needs_post_dma_flush(struct device *dev) -{ - if (plat_device_is_coherent(dev)) - return false; - - switch (boot_cpu_type()) { - case CPU_R10000: - case CPU_R12000: - case CPU_BMIPS5000: - return true; - - default: - /* - * Presence of MAARs suggests that the CPU supports - * speculatively prefetching data, and therefore requires - * the post-DMA flush/invalidate. - */ - return cpu_has_maar; - } -} - -static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp) -{ - gfp_t dma_flag; - -#ifdef CONFIG_ISA - if (dev == NULL) - dma_flag = __GFP_DMA; - else -#endif -#if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA) - if (dev == NULL || dev->coherent_dma_mask < DMA_BIT_MASK(32)) - dma_flag = __GFP_DMA; - else if (dev->coherent_dma_mask < DMA_BIT_MASK(64)) - dma_flag = __GFP_DMA32; - else -#endif -#if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA) - if (dev == NULL || dev->coherent_dma_mask < DMA_BIT_MASK(64)) - dma_flag = __GFP_DMA32; - else -#endif -#if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32) - if (dev == NULL || - dev->coherent_dma_mask < DMA_BIT_MASK(sizeof(phys_addr_t) * 8)) - dma_flag = __GFP_DMA; - else -#endif - dma_flag = 0; - - /* Don't invoke OOM killer */ - gfp |= __GFP_NORETRY; - - return gfp | dma_flag; -} - -static void *mips_dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) -{ - void *ret; - struct page *page = NULL; - unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; - - gfp = massage_gfp_flags(dev, gfp); - - if (IS_ENABLED(CONFIG_DMA_CMA) && gfpflags_allow_blocking(gfp)) - page = dma_alloc_from_contiguous(dev, count, get_order(size), - gfp); - if (!page) - page = alloc_pages(gfp, get_order(size)); - - if (!page) - return NULL; - - ret = page_address(page); - memset(ret, 0, size); - *dma_handle = plat_map_dma_mem(dev, ret, size); - if (!(attrs & DMA_ATTR_NON_CONSISTENT) && - !plat_device_is_coherent(dev)) { - dma_cache_wback_inv((unsigned long) ret, size); - ret = UNCAC_ADDR(ret); - } - - return ret; -} - -static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) -{ - unsigned long addr = (unsigned long) vaddr; - unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; - struct page *page = NULL; - - plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL); - - if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !plat_device_is_coherent(dev)) - addr = CAC_ADDR(addr); - - page = virt_to_page((void *) addr); - - if (!dma_release_from_contiguous(dev, page, count)) - __free_pages(page, get_order(size)); -} - -static int mips_dma_mmap(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size, - unsigned long attrs) -{ - unsigned long user_count = vma_pages(vma); - unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; - unsigned long addr = (unsigned long)cpu_addr; - unsigned long off = vma->vm_pgoff; - unsigned long pfn; - int ret = -ENXIO; - - if (!plat_device_is_coherent(dev)) - addr = CAC_ADDR(addr); - - pfn = page_to_pfn(virt_to_page((void *)addr)); - - if (attrs & DMA_ATTR_WRITE_COMBINE) - vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); - else - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - - if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) - return ret; - - if (off < count && user_count <= (count - off)) { - ret = remap_pfn_range(vma, vma->vm_start, - pfn + off, - user_count << PAGE_SHIFT, - vma->vm_page_prot); - } - - return ret; -} - -static inline void __dma_sync_virtual(void *addr, size_t size, - enum dma_data_direction direction) -{ - switch (direction) { - case DMA_TO_DEVICE: - dma_cache_wback((unsigned long)addr, size); - break; - - case DMA_FROM_DEVICE: - dma_cache_inv((unsigned long)addr, size); - break; - - case DMA_BIDIRECTIONAL: - dma_cache_wback_inv((unsigned long)addr, size); - break; - - default: - BUG(); - } -} - -/* - * A single sg entry may refer to multiple physically contiguous - * pages. But we still need to process highmem pages individually. - * If highmem is not configured then the bulk of this loop gets - * optimized out. - */ -static inline void __dma_sync(struct page *page, - unsigned long offset, size_t size, enum dma_data_direction direction) -{ - size_t left = size; - - do { - size_t len = left; - - if (PageHighMem(page)) { - void *addr; - - if (offset + len > PAGE_SIZE) { - if (offset >= PAGE_SIZE) { - page += offset >> PAGE_SHIFT; - offset &= ~PAGE_MASK; - } - len = PAGE_SIZE - offset; - } - - addr = kmap_atomic(page); - __dma_sync_virtual(addr + offset, len, direction); - kunmap_atomic(addr); - } else - __dma_sync_virtual(page_address(page) + offset, - size, direction); - offset = 0; - page++; - left -= len; - } while (left); -} - -static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, - size_t size, enum dma_data_direction direction, unsigned long attrs) -{ - if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - __dma_sync(dma_addr_to_page(dev, dma_addr), - dma_addr & ~PAGE_MASK, size, direction); - plat_post_dma_flush(dev); - plat_unmap_dma_mem(dev, dma_addr, size, direction); -} - -static int mips_dma_map_sg(struct device *dev, struct scatterlist *sglist, - int nents, enum dma_data_direction direction, unsigned long attrs) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nents, i) { - if (!plat_device_is_coherent(dev) && - !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - __dma_sync(sg_page(sg), sg->offset, sg->length, - direction); -#ifdef CONFIG_NEED_SG_DMA_LENGTH - sg->dma_length = sg->length; -#endif - sg->dma_address = plat_map_dma_mem_page(dev, sg_page(sg)) + - sg->offset; - } - - return nents; -} - -static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, enum dma_data_direction direction, - unsigned long attrs) -{ - if (!plat_device_is_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - __dma_sync(page, offset, size, direction); - - return plat_map_dma_mem_page(dev, page) + offset; -} - -static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, - int nhwentries, enum dma_data_direction direction, - unsigned long attrs) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nhwentries, i) { - if (!plat_device_is_coherent(dev) && - !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && - direction != DMA_TO_DEVICE) - __dma_sync(sg_page(sg), sg->offset, sg->length, - direction); - plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction); - } -} - -static void mips_dma_sync_single_for_cpu(struct device *dev, - dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) -{ - if (cpu_needs_post_dma_flush(dev)) - __dma_sync(dma_addr_to_page(dev, dma_handle), - dma_handle & ~PAGE_MASK, size, direction); - plat_post_dma_flush(dev); -} - -static void mips_dma_sync_single_for_device(struct device *dev, - dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) -{ - if (!plat_device_is_coherent(dev)) - __dma_sync(dma_addr_to_page(dev, dma_handle), - dma_handle & ~PAGE_MASK, size, direction); -} - -static void mips_dma_sync_sg_for_cpu(struct device *dev, - struct scatterlist *sglist, int nelems, - enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - if (cpu_needs_post_dma_flush(dev)) { - for_each_sg(sglist, sg, nelems, i) { - __dma_sync(sg_page(sg), sg->offset, sg->length, - direction); - } - } - plat_post_dma_flush(dev); -} - -static void mips_dma_sync_sg_for_device(struct device *dev, - struct scatterlist *sglist, int nelems, - enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - if (!plat_device_is_coherent(dev)) { - for_each_sg(sglist, sg, nelems, i) { - __dma_sync(sg_page(sg), sg->offset, sg->length, - direction); - } - } -} - -static int mips_dma_supported(struct device *dev, u64 mask) -{ - return plat_dma_supported(dev, mask); -} - -static void mips_dma_cache_sync(struct device *dev, void *vaddr, size_t size, - enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - if (!plat_device_is_coherent(dev)) - __dma_sync_virtual(vaddr, size, direction); -} - -const struct dma_map_ops mips_default_dma_map_ops = { - .alloc = mips_dma_alloc_coherent, - .free = mips_dma_free_coherent, - .mmap = mips_dma_mmap, - .map_page = mips_dma_map_page, - .unmap_page = mips_dma_unmap_page, - .map_sg = mips_dma_map_sg, - .unmap_sg = mips_dma_unmap_sg, - .sync_single_for_cpu = mips_dma_sync_single_for_cpu, - .sync_single_for_device = mips_dma_sync_single_for_device, - .sync_sg_for_cpu = mips_dma_sync_sg_for_cpu, - .sync_sg_for_device = mips_dma_sync_sg_for_device, - .dma_supported = mips_dma_supported, - .cache_sync = mips_dma_cache_sync, -}; -EXPORT_SYMBOL(mips_default_dma_map_ops); -- cgit v1.2.3