6894258eda
Since 2009 we have a nice asm-generic header implementing lots of DMA API functions for architectures using struct dma_map_ops, but unfortunately it's still missing a lot of APIs that all architectures still have to duplicate. This series consolidates the remaining functions, although we still need arch opt outs for two of them as a few architectures have very non-standard implementations. This patch (of 5): The coherent DMA allocator works the same over all architectures supporting dma_map operations. This patch consolidates them and converges the minor differences: - the debug_dma helpers are now called from all architectures, including those that were previously missing them - dma_alloc_from_coherent and dma_release_from_coherent are now always called from the generic alloc/free routines instead of the ops dma-mapping-common.h always includes dma-coherent.h to get the defintions for them, or the stubs if the architecture doesn't support this feature - checks for ->alloc / ->free presence are removed. There is only one magic instead of dma_map_ops without them (mic_dma_ops) and that one is x86 only anyway. Besides that only x86 needs special treatment to replace a default devices if none is passed and tweak the gfp_flags. An optional arch hook is provided for that. [linux@roeck-us.net: fix build] [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Michal Simek <monstr@monstr.eu> Cc: Jonas Bonn <jonas@southpole.se> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*
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* Copyright (C) 2003-2013 Broadcom Corporation
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* All Rights Reserved
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the Broadcom
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/scatterlist.h>
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#include <linux/bootmem.h>
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#include <linux/export.h>
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#include <linux/swiotlb.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/bootinfo.h>
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static char *nlm_swiotlb;
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static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
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{
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
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#ifdef CONFIG_ZONE_DMA32
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if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
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gfp |= __GFP_DMA32;
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#endif
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/* Don't invoke OOM killer */
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gfp |= __GFP_NORETRY;
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return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
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}
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static void nlm_dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
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{
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swiotlb_free_coherent(dev, size, vaddr, dma_handle);
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}
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struct dma_map_ops nlm_swiotlb_dma_ops = {
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.alloc = nlm_dma_alloc_coherent,
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.free = nlm_dma_free_coherent,
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.map_page = swiotlb_map_page,
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.unmap_page = swiotlb_unmap_page,
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.map_sg = swiotlb_map_sg_attrs,
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.unmap_sg = swiotlb_unmap_sg_attrs,
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.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
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.sync_single_for_device = swiotlb_sync_single_for_device,
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.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = swiotlb_sync_sg_for_device,
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.mapping_error = swiotlb_dma_mapping_error,
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.dma_supported = swiotlb_dma_supported
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};
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void __init plat_swiotlb_setup(void)
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{
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size_t swiotlbsize;
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unsigned long swiotlb_nslabs;
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swiotlbsize = 1 << 20; /* 1 MB for now */
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swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
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swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
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swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
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nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
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swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);
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}
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