函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\dma\swiotlb.c Create Date:2022-07-27 11:35:42
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Early SWIOTLB allocation may be too early to allow an architecture to* perform the desired operations. This function allows the architecture to* call SWIOTLB when the operations are possible. It needs to be called* before the SWIOTLB memory is used.

函数原型：void __init swiotlb_update_mem_attributes(void)

返回类型：void

参数：无

191  如果no_iotlb_memory或late_alloc则返回
194  vaddr等于phys_to_virt - map physical address to virtual*@address: address to remap* The returned virtual address is a current CPU mapping for* the memory address given. It is only valid to use this function on* addresses that have a kernel mapping
195  bytes等于 align the pointer to the (next) page boundary (The number of IO TLB blocks (in groups of 64) between io_tlb_start and* io_tlb_end. This is command line adjustable via setup_io_tlb_npages. << log of the size of each IO TLB slab. The number of slabs is command line* controllable.)
196  set_memory_decrypted((unsignedlong)vaddr, bytes >> PAGE_SHIFT determines the page size )
197  memset(vaddr, 0, bytes)