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6ac2104deb
arm64 bit targets need the features CMA provides. Add the appropriate hooks, header files, and Kconfig to allow this to happen. Cc: Will Deacon <will.deacon@arm.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/*
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* SWIOTLB-based DMA API implementation
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*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/gfp.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-contiguous.h>
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#include <linux/vmalloc.h>
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#include <linux/swiotlb.h>
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#include <asm/cacheflush.h>
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struct dma_map_ops *dma_ops;
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EXPORT_SYMBOL(dma_ops);
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static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags,
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struct dma_attrs *attrs)
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{
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if (dev == NULL) {
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WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
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return NULL;
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}
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if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
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dev->coherent_dma_mask <= DMA_BIT_MASK(32))
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flags |= GFP_DMA32;
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if (IS_ENABLED(CONFIG_DMA_CMA)) {
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struct page *page;
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page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
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get_order(size));
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if (!page)
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return NULL;
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*dma_handle = phys_to_dma(dev, page_to_phys(page));
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return page_address(page);
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} else {
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return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
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}
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}
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static void arm64_swiotlb_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle,
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struct dma_attrs *attrs)
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{
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if (dev == NULL) {
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WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
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return;
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}
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if (IS_ENABLED(CONFIG_DMA_CMA)) {
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phys_addr_t paddr = dma_to_phys(dev, dma_handle);
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dma_release_from_contiguous(dev,
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phys_to_page(paddr),
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size >> PAGE_SHIFT);
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} else {
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swiotlb_free_coherent(dev, size, vaddr, dma_handle);
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}
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}
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static struct dma_map_ops arm64_swiotlb_dma_ops = {
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.alloc = arm64_swiotlb_alloc_coherent,
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.free = arm64_swiotlb_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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.dma_supported = swiotlb_dma_supported,
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.mapping_error = swiotlb_dma_mapping_error,
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};
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void __init arm64_swiotlb_init(void)
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{
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dma_ops = &arm64_swiotlb_dma_ops;
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swiotlb_init(1);
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}
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#define PREALLOC_DMA_DEBUG_ENTRIES 4096
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static int __init dma_debug_do_init(void)
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{
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dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
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return 0;
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}
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fs_initcall(dma_debug_do_init);
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