Function report |
Source Code:kernel\dma\debug.c |
Create Date:2022-07-28 10:35:23 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:debug_dma_alloc_coherent
Proto:void debug_dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t dma_addr, void *virt)
Type:void
Parameter:
Type | Parameter | Name |
---|---|---|
struct device * | dev | |
size_t | size | |
dma_addr_t | dma_addr | |
void * | virt |
1436 | If Value for the false possibility is greater at compile time(dma_debug_disabled()) Then Return |
1439 | If Value for the false possibility is greater at compile time(virt == NULL) Then Return |
1446 | entry = struct dma_entry allocator* The next two functions implement the allocator for* struct dma_debug_entries. |
1447 | If Not entry Then Return |
1450 | type = dma_debug_coherent |
1452 | offset = offset_in_page(virt) |
1455 | direction = DMA_BIDIRECTIONAL |
1457 | If Determine if an address is within the vmalloc range* On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there* is no special casing required. Then pfn = vmalloc_to_pfn(virt) |
1459 | Else pfn = page_to_pfn(virt_to_page(kaddr) returns a valid pointer if and only if* virt_addr_valid(kaddr) returns true.(virt)) |
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