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b6e05477c1
Give the basic phys_to_dma() and dma_to_phys() helpers a __-prefix and add the memory encryption mask to the non-prefixed versions. Use the __-prefixed versions directly instead of clearing the mask again in various places. Tested-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Joerg Roedel <joro@8bytes.org> Cc: Jon Mason <jdmason@kudzu.us> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Muli Ben-Yehuda <mulix@mulix.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: iommu@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20180319103826.12853-13-hch@lst.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/scatterlist.h>
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#include <linux/swiotlb.h>
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#include <linux/bootmem.h>
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#include <asm/bootinfo.h>
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#include <boot_param.h>
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#include <dma-coherence.h>
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static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
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{
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void *ret = swiotlb_alloc(dev, size, dma_handle, gfp, attrs);
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mb();
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return ret;
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}
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static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
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dir, attrs);
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mb();
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return daddr;
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}
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static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs)
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{
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int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs);
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mb();
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return r;
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}
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static void loongson_dma_sync_single_for_device(struct device *dev,
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dma_addr_t dma_handle, size_t size,
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enum dma_data_direction dir)
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{
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swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
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mb();
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}
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static void loongson_dma_sync_sg_for_device(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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swiotlb_sync_sg_for_device(dev, sg, nents, dir);
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mb();
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}
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static int loongson_dma_supported(struct device *dev, u64 mask)
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{
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if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits))
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return 0;
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return swiotlb_dma_supported(dev, mask);
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}
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dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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long nid;
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#ifdef CONFIG_PHYS48_TO_HT40
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/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
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* Loongson-3's 48bit address space and embed it into 40bit */
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nid = (paddr >> 44) & 0x3;
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paddr = ((nid << 44) ^ paddr) | (nid << 37);
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#endif
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return paddr;
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}
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phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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long nid;
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#ifdef CONFIG_PHYS48_TO_HT40
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/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
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* Loongson-3's 48bit address space and embed it into 40bit */
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nid = (daddr >> 37) & 0x3;
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daddr = ((nid << 37) ^ daddr) | (nid << 44);
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#endif
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return daddr;
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}
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static const struct dma_map_ops loongson_dma_map_ops = {
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.alloc = loongson_dma_alloc_coherent,
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.free = swiotlb_free,
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.map_page = loongson_dma_map_page,
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.unmap_page = swiotlb_unmap_page,
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.map_sg = loongson_dma_map_sg,
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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 = loongson_dma_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 = loongson_dma_sync_sg_for_device,
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.mapping_error = swiotlb_dma_mapping_error,
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.dma_supported = loongson_dma_supported,
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};
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void __init plat_swiotlb_setup(void)
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{
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swiotlb_init(1);
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mips_dma_map_ops = &loongson_dma_map_ops;
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}
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