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Avoid expensive indirect calls in the fast path DMA mapping operations by directly calling the dma_direct_* ops if we are using the directly mapped DMA operations. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com>
41 lines
968 B
C
41 lines
968 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/dma-direct.h>
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#include <linux/swiotlb.h>
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#include <linux/export.h>
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/* Set this to 1 if there is a HW IOMMU in the system */
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int iommu_detected __read_mostly;
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const struct dma_map_ops *dma_ops;
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EXPORT_SYMBOL(dma_ops);
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const struct dma_map_ops *dma_get_ops(struct device *dev)
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{
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return dma_ops;
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}
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EXPORT_SYMBOL(dma_get_ops);
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#ifdef CONFIG_SWIOTLB
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void *arch_dma_alloc(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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return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
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}
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void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_addr, unsigned long attrs)
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{
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dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
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}
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long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
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dma_addr_t dma_addr)
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{
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return page_to_pfn(virt_to_page(cpu_addr));
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}
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void __init swiotlb_dma_init(void)
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{
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swiotlb_init(1);
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}
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#endif
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