Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\dma\debug.c Create Date:2022-07-28 10:35:15
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:debug_dma_map_page

Proto:void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, size_t size, int direction, dma_addr_t dma_addr)

Type:void

Parameter:

TypeParameterName
struct device *dev
struct page *page
size_toffset
size_tsize
intdirection
dma_addr_tdma_addr
1255  If Value for the false possibility is greater at compile time(dma_debug_disabled()) Then Return
1258  If dma_mapping_error(dev, dma_addr) Then Return
1261  entry = struct dma_entry allocator* The next two functions implement the allocator for* struct dma_debug_entries.
1262  If Not entry Then Return
1265  dev = dev
1266  type = dma_debug_single
1267  pfn = page_to_pfn(page)
1268  offset = offset , dev_addr = dma_addr
1270  size = size
1271  direction = direction
1272  map_err_type = MAP_ERR_NOT_CHECKED
1274  check_for_stack(dev, page, offset)
1276  If Not PageHighMem(page) Then
1277  addr = page_address(page) + offset
1279  check_for_illegal_area(dev, addr, size)
1282  Wrapper function for adding an entry to the hash.* This function takes care of locking itself.