函数逻辑报告 |
Source Code:kernel\dma\debug.c |
Create Date:2022-07-27 11:35:08 |
| Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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函数名称：debug_dma_map_sg
函数原型：void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, int mapped_ents, int direction)
返回类型：void
参数：
| 类型 | 参数 | 名称 |
|---|---|---|
| struct device * | dev | |
| struct scatterlist * | sg | |
| int | nents | |
| int | mapped_ents | |
| int | direction |
| 1348 | 如果此条件成立可能性小(为编译器优化)(dma_debug_disabled())则返回 |
| 1352 | entry等于struct dma_entry allocator* The next two functions implement the allocator for* struct dma_debug_entries. |
| 1353 | 如果非entry则返回 |
| 1356 | type等于dma_debug_sg |
| 1358 | pfn等于page_to_pfn(sg_page(s)) |
| 1359 | offset等于offset, size等于sg_dma_len(s) |
| 1361 | dev_addr等于These macros should be used after a dma_map_sg call has been done* to get bus addresses of each of the SG entries and their lengths(s) |
| 1363 | sg_call_ents等于nents |
| 1364 | sg_mapped_ents等于mapped_ents |
| 1366 | check_for_stack(dev, sg_page(s), offset) |
| 1368 | 如果非PageHighMem(sg_page(s))则 |
| 1369 | check_for_illegal_area(dev, 返回SG虚拟地址入口, sg_dma_len(s)) |
| 1372 | check_sg_segment(dev, s) |
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