函数源码 |
Source File:kernel\dma\swiotlb.c |
Create Date:2022-07-27 11:36:10 |
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657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 | /* * Create a swiotlb mapping for the buffer at @phys, and in case of DMAing * to the device copy the data into it as well. */bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir, unsigned long attrs){ trace_swiotlb_bounced(dev, *dma_addr, size, swiotlb_force); if (unlikely(swiotlb_force == SWIOTLB_NO_FORCE)) { dev_warn_ratelimited(dev, "Cannot do DMA to address %pa\n", phys); return false; } /* Oh well, have to allocate and map a bounce buffer. */ *phys = swiotlb_tbl_map_single(dev, __phys_to_dma(dev, io_tlb_start), *phys, size, size, dir, attrs); if (*phys == (phys_addr_t)DMA_MAPPING_ERROR) return false; /* Ensure that the address returned is DMA'ble */ *dma_addr = __phys_to_dma(dev, *phys); if (unlikely(!dma_capable(dev, *dma_addr, size, true))) { swiotlb_tbl_unmap_single(dev, *phys, size, size, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC); return false; } return true;} |