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https://community.oracle.com/thread/1953503
Jan 07, 2002 · Hi, when I try to drivering a rgb siganl capture card. I alloc kernel space for dma and map this to user space. use ddi_umem_alloc to allocate space; use ddi_dma_addr_bind_handle to tie dma handle with kernel space; and produce dma cookie. this is the physical address of the space. and then in devmap I mapp this space out to user. and more I don't know how to make user allacated space for dma …
http://lwn.net/Articles/309529/
Dec 03, 2008 · From: Edward Estabrook <[email protected]> Here is a patch that adds the ability to dynamically allocate (and use) coherent DMA from …
https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/3fa0668b-33b9-4aff-a762-9af6d735f5f7/dma-provide-address-from-user-space
Nov 14, 2011 · I want to DMA the data from my pci-ex card to the RAM. From what I see in the documentation about wdf, destination address will be provided by the DMA system of Windows. What I'm wondering is, is it possible to provide that address from a user space application and share it with the driver that would pass it to the device for the DMA transaction.
https://stackoverflow.com/questions/5539375/linux-kernel-device-driver-to-dma-from-a-device-into-user-space-memory
Linux kernel device driver to DMA from a device into user-space memory. Ask Question Asked 8 years, ... add a comment ... It is worth mention that driver with Scatter-Gather DMA support and user space memory allocation is most efficient and has highest performance. However in case we don't need high performance or we want to develop a driver ...
https://stackoverflow.com/questions/3333959/mapping-dma-buffers-to-userspace
They go to much effort to make zero-copy DMA and RDMA to user-space work. I forgot to add this before saving: Doing DMA directly to user-space memory mappings is full of problems, so unless you have very high performance requirements like Infiniband or 10 Gb Ethernet, don't do it. Instead, copy the DMA'd data into the userspace buffers.
https://github.com/zephyrproject-rtos/zephyr/pull/15108
Half transfer event of DMA is often used in scenarios with fast I/O processing. For example, in receiving result from ADC or SPI, if we process data after receiving the transfer complete event signal, the ADC or SPI will fill the buffer with new data as soon as possible, therefore data from last frame may be replaced with the new coming data when we are processing them in user space and the ...
https://forums.xilinx.com/xlnx/attachments/xlnx/ELINUX/10693/1/Linux%20DMA%20from%20User%20Space-public.pdf
Linux provides frameworks that allow user space to interface with kernel space for most types of devices (except DMA) User Space DMA is defined as the ability to access buffers for DMA transfers and control DMA transfers from a user space application – This is not an industry standard and there are a number of possible methods
https://code-examples.net/en/q/54862f
I can get a physical address from to pass to the device so that all user-space has to do is perform a read on the driver ; the read method would activate the DMA transfer, block waiting for the DMA complete interrupt and release the user-space read afterwards (user-space is now safe to use/read memory).
http://www.blog.idv-tech.com/wp-content/uploads/2014/09/drivers-session3-uio-4public.pdf
User Space Driver Flow 1. The kernel space UIO device driver(s) must be loaded before the user space driver is started (if using modules) 2. The user space application is started and the UIO device file is opened (/dev/uioX where X is 0, 1, 2…) – From user space, the UIO device is a device node in the file system just like any other device 3.
https://blog.linuxplumbersconf.org/2017/ocw/system/presentations/4669/original/Support%20user%20space%20POSIX%20conformant%20contiguous__v1.00.pdf
Solution #3: Specific HW support – ARMv8-A Contiguous block entries. •ARMv8-A architecture provides a feature known as contiguous block entries - efficiently uses TLB space. •Each TLB entry contains a contiguous bit. When set, bit signals to TLB that it can cache a single entry covering translations for …
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