elseif(pasid==INVALID_IOASID) return0; } if(pasid==INVALID_IOASID) pr_err("[%s NO_PASID] Request device [%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n", type?"DMA Read":"DMA Write", source_id>>8,PCI_SLOT(source_id&0xFF), ...
在使能SMMU情况下,设备通过SMMU访问内存,在访问之前,须建立起设备访问地址即IOVA到物理内存地址PA之间的映射(保存在内存中), 此过程称为DMA MAP过程,后续设备需要访问时SMMU自动将设备发送的IOVA转化为PA,当不需要再访问时取消之前建立的映射,此过程称为DMA UNMAP过程。若在没有建立映射前对物理内存进行访问,产生缺...
vfio_dma 1structvfio_dma {2structrb_node node;3dma_addr_t iova;/*Device address*/4unsignedlongvaddr;/*Process virtual addr*/5size_t size;/*Map size (bytes)*/6intprot;/*IOMMU_READ/WRITE*/7booliommu_mapped;8boollock_cap;/*capable(CAP_IPC_LOCK)*/9structtask_struct *task;10structrb...
Then the Intel VT-d driver gets the system reserved memory information, and always grants DMA access (read and write) to this memory to this specific device declared in the associated DEVICE_SCOPE of the RMRR table. Step 2: Setup DMAR Translation Table The Intel VT-d dr...
Then the Intel VT-d driver gets the system reserved memory information, and always grants DMA access (read and write) to this memory to this specific device declared in the associated DEVICE_SCOPE of the RMRR table. Step 2: Setup DMAR Translation Table The Intel VT-...