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WDF PCIe Driver: PCIe WDFDMATRANSACTION task support PSCATTER_GATHER_LIST SgList Max 8Mbytes space to transfer data per time?

hl kuang 0 Reputation points
2023-08-17T12:01:03.96+00:00
    1. Use MmAllocateContiguousMemory to allocate 32 * 1024 * 1024 bytes(32MB) continuous physical space returns kernel virtual address.
    1. Use MDL map memory into user space.
    1. Use IOCTL to run DmaTransaction task.
    1. Error: Transmission task to arrange the transmission 32MB of data,but PSCATTER_GATHER_LIST SgList was allocated Max 8MB of transmission Elements space? So i need help.
  • WDF in Kernel state: This is a WDFDMATRANSACTION task. enter image description here
  • App in User state: to check PCIe DMA transaction. User's image
  • Debug view log: Just put out transfer size in bytes per time. User's image
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