dma_map_single return value
dma_map_single returns a DMA address, which is an address on the bus that the device is connected to. In other words, a DMA address is relative to the bus and does not make any sense without a bus. You cannot do DMA without some real device (that has been,dma_alloc_coherent() returns two values: the virtual address which you can use to access it from the CPU and dma_handle which you pass to the card. The CPU ... ,Like dma_alloc_coherent(), this returns two values: an address usable by the CPU, and the DMA address usable by the pool's device. :: void dma_pool_free(struct ... ,2016年8月22日 — My understanding is we allocate memory in kernel space (with DMA constraints) and pass it to the dma_map_single() function, this function will ... ,dma_alloc_coherent() returns two values: the virtual address which you can use to access it from the CPU and dma_handle which you pass to the card. The CPU ... ,this returns two values, cpu_addr and dma_handle. Free memory that was allocated from a dma_pool like this: dma_pool_free(pool ... ,Returns the maximum size of a mapping for the device. The size parameter of the mapping functions like dma_map_single(), dma_map_page() and others should not be ... ,2020年2月12日 — 3) Use dma_unmap_addr,len}() to access these values. Example, before::. ,this returns two values, cpu_addr and dma_handle. Free memory that was allocated from a dma_pool like this: dma_pool_free(pool ... ,... return DMA_BIT_MASK(32); } /* * Set both the DMA mask and the coherent DMA mask to the same thing. * Note that we don't check the return value from ...
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 dma_map_single return value 相關參考資料
dma_map_single(): minimum requirements to struct device
dma_map_single returns a DMA address, which is an address on the bus that the device is connected to. In other words, a DMA address is relative to the bus and does not make any sense without a bus. Yo... https://stackoverflow.com DMA-API-HOWTO.txt
dma_alloc_coherent() returns two values: the virtual address which you can use to access it from the CPU and dma_handle which you pass to the card. The CPU ... https://www.kernel.org DMA-API.txt
Like dma_alloc_coherent(), this returns two values: an address usable by the CPU, and the DMA address usable by the pool's device. :: void dma_pool_free(struct ... https://www.kernel.org dma_map_single internals on arm archtecture
2016年8月22日 — My understanding is we allocate memory in kernel space (with DMA constraints) and pass it to the dma_map_single() function, this function will ... https://stackoverflow.com Dynamic DMA mapping Guide — The Linux Kernel 5.10.0 ...
dma_alloc_coherent() returns two values: the virtual address which you can use to access it from the CPU and dma_handle which you pass to the card. The CPU ... https://www.infradead.org DocumentationDMA-API-HOWTO.txt - kernelomap
this returns two values, cpu_addr and dma_handle. Free memory that was allocated from a dma_pool like this: dma_pool_free(pool ... https://android.googlesource.c Dynamic DMA mapping using the generic device
Returns the maximum size of a mapping for the device. The size parameter of the mapping functions like dma_map_single(), dma_map_page() and others should not be ... https://www.infradead.org linuxDMA-API-HOWTO.txt：Dynamic DMA mapping Guide ...
2020年2月12日 — 3) Use dma_unmap_addr,len}() to access these values. Example, before::. https://blog.csdn.net DocumentationDMA-API-HOWTO.txt - kernelmsm
this returns two values, cpu_addr and dma_handle. Free memory that was allocated from a dma_pool like this: dma_pool_free(pool ... https://android.googlesource.c includelinuxdma-mapping.h - Linux source code (v6.8.7)
... return DMA_BIT_MASK(32); } /* * Set both the DMA mask and the coherent DMA mask to the same thing. * Note that we don't check the return value from ... https://elixir.bootlin.com |