Messages in this thread | | | From | Alan Tull <> | Date | Wed, 6 Jun 2018 11:09:23 -0500 | Subject | Re: [PATCH v5 28/28] fpga: dfl: afu: add DFL_FPGA_PORT_DMA_MAP/UNMAP ioctls support |
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On Tue, May 1, 2018 at 9:50 PM, Wu Hao <hao.wu@intel.com> wrote:
Hi Hao,
> DMA memory regions are required for Accelerated Function Unit (AFU) usage. > These two ioctls allow user space applications to map user memory regions > for dma, and unmap them after use. Iova is returned from driver to user > space application via DFL_FPGA_PORT_DMA_MAP ioctl. Application needs to unmap > it after use, otherwise, driver will unmap them in device file release > operation. > > Each AFU has its own rb tree to keep track of its mapped DMA regions. > > Ioctl interfaces: > * DFL_FPGA_PORT_DMA_MAP > Do the dma mapping per user_addr and length which provided by user. > Return iova in provided struct dfl_fpga_port_dma_map. > > * DFL_FPGA_PORT_DMA_UNMAP > Unmap the dma region per iova provided by user. > > Signed-off-by: Tim Whisonant <tim.whisonant@intel.com> > Signed-off-by: Enno Luebbers <enno.luebbers@intel.com> > Signed-off-by: Shiva Rao <shiva.rao@intel.com> > Signed-off-by: Christopher Rauer <christopher.rauer@intel.com> > Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> > Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
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