dma_sync_single_for_cpu
這種方式不保證cache的一致性，需要開發者手動處理（調用dma_sync_single_for_cpu/device函數？）； 另外，必須保證內存的虛擬地址空間邊界 ...,既然我所使用的ip 沒有讓我有DMA的方式去用所以我在linux kernel 那邊的norflash driver 就不必要去作 dma_sync_single_for_cpu(NULL, virt_to_bus((void ... , dma_sync_single_for_cpu() gives ownership of the DMA buffer back to the processor. After that call, driver code can read or modify the buffer, ...,So, firstly, just map it with dma_map_single,sg}(), and after each DMA transfer call either:: dma_sync_single_for_cpu(dev, dma_handle, size, direction); or:: ... ,void dma_sync_single_for_cpu(struct device *dev,dma_handle_t bus_addr, size_t size,enum dma_data_direction direction); 將緩沖區所有權交還給設備： ,Defined in 1 files: include/linux/dma-mapping.h, line 215 (as a function). Referenced in 86 files: arch/tile/kernel/pci-dma.c · line 291 · line 477. ,Defined in 18 files: arch/arc/include/asm/dma-mapping.h, line 147 (as a function) · arch/avr32/include/asm/dma-mapping.h, line 264 (as a function) ... , If you are doing only a single DMA transfer, you do not need to call dma_sync_single_for_cpu() ; you can just read the buffer after the ...,dma_sync_single_for_cpu takes a really long time. Russell King - ARM Linux linux at arm.linux.org.uk. Mon Jun 29 06:29:27 PDT 2015. Previous message (by ... ,dma_sync_single_for_cpu(dev, dma_handle, size, direction);. or: dma_sync_sg_for_cpu(dev, sglist, nents, direction);. as appropriate. Then, if you wish to let the ...
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 dma_sync_single_for_cpu 相關參考資料
linux kernel中dma內存的使用- 下載最新版- udn部落格
這種方式不保證cache的一致性，需要開發者手動處理（調用dma_sync_single_for_cpu/device函數？）； 另外，必須保證內存的虛擬地址空間邊界 ... http://blog.udn.com 內存映射與DMA筆記@ 程式專欄:: 隨意窩Xuite日誌
既然我所使用的ip 沒有讓我有DMA的方式去用所以我在linux kernel 那邊的norflash driver 就不必要去作 dma_sync_single_for_cpu(NULL, virt_to_bus((void ... https://blog.xuite.net The DMA API changes [LWN.net]
dma_sync_single_for_cpu() gives ownership of the DMA buffer back to the processor. After that call, driver code can read or modify the buffer, ... https://lwn.net dma api howto - Kernel.org
So, firstly, just map it with dma_map_single,sg}(), and after each DMA transfer call either:: dma_sync_single_for_cpu(dev, dma_handle, size, direction); or:: ... https://www.kernel.org 核心記憶體@ Welkin小窩:: 痞客邦::
void dma_sync_single_for_cpu(struct device *dev,dma_handle_t bus_addr, size_t size,enum dma_data_direction direction); 將緩沖區所有權交還給設備： http://welkinchen.pixnet.net Linux source code: dma_sync_single_for_cpu identifier (v4.7) - Bootlin
Defined in 1 files: include/linux/dma-mapping.h, line 215 (as a function). Referenced in 86 files: arch/tile/kernel/pci-dma.c · line 291 · line 477. https://elixir.bootlin.com Linux source code: dma_sync_single_for_cpu identifier (v4.1) - Bootlin
Defined in 18 files: arch/arc/include/asm/dma-mapping.h, line 147 (as a function) · arch/avr32/include/asm/dma-mapping.h, line 264 (as a function) ... https://elixir.bootlin.com c - Can I call dma_unmap_single after dma_sync_single_for_cpu ...
If you are doing only a single DMA transfer, you do not need to call dma_sync_single_for_cpu() ; you can just read the buffer after the ... https://stackoverflow.com dma_sync_single_for_cpu takes a really long time - lists.infradead.org
dma_sync_single_for_cpu takes a really long time. Russell King - ARM Linux linux at arm.linux.org.uk. Mon Jun 29 06:29:27 PDT 2015. Previous message (by ... http://lists.infradead.org DocumentationDMA-API-HOWTO.txt - kernelomap - Git at Google
dma_sync_single_for_cpu(dev, dma_handle, size, direction);. or: dma_sync_sg_for_cpu(dev, sglist, nents, direction);. as appropriate. Then, if you wish to let the ... https://android.googlesource.c |