•dma_sync_single_for_device是Linux内核中用于同步设备与内存之间单个数据缓冲区的函数。 2. •dma_sync_single_for_device函数用于确保设备与内存中的数据一致性,即设备能够正确读取或写入内存中的数据。 •它会刷新设备或CPU缓存中的数据,使得设备操作的是内存中最新的数据。 •dma_sync_single_for_device...
dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE); clear_interrupts(denali); denali_setup_dma(denali, DENALI_READ);/* wait for operation to complete */wait_for_irq(denali, irq_mask);dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE); denali_enable...
Hi, I want to make DMA memory accessiblee to cpu. I realize dma_map_single can be returned using dma_sync_single_for_cpu. Can this be also used to return pages i.e. addresses returned via dma_map_page? Regards, Asim -- To unsubscribe from this list: send an email with "unsubscrib...
>> DMA_BIDIRECTIONAL >> when dma_unmap_single() is called. >> >> However, on some architechtures (at least avr32, blackfin, ...), cache >> synchronization only happens when dma_map_single() is called (and then >> irrespective of DMA direction). dma_unmap_single() is a no-op f...
dma_sync_single_for_cpu(tup->uport.dev, tup->rx_dma_buf_phys, TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE); copied = tty_insert_flip_string_lock(tty, ((unsignedchar*)(tup->rx_dma_buf_virt)), count);if(copied != count) ...