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Old 09-05-2019, 03:43 PM   #1
beandigital
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Registered: Jan 2013
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Creating a NVMe driver for a custom controller


I am a hardware engineer and I have developed a NVMe controller that is used in a FPGA. This controller takes care of the NVMe protocol (setting up the PCIe link, admin and IO queue control, DMA to/from memory etc). The controller is attached to a bus that has a ARM CPU and DDR memory attached.

I would like to use this with Linux but I need a driver. The Linux NVMe driver is not suitable, as it does the queue management itself. My driver just needs to submit commands to the controller and then wait until they finish. I am not a Linux expert so I am trying to figure out how to do this.

Would it be possible to write a block driver to do this? The Linux driver seems quite complex, but it has more to deal with. I am hoping that mine could be simpler. I am also happy to pay someone to do this, if they have better Linux skills then myself. Thanks
 
Old 09-06-2019, 04:22 PM   #2
smallpond
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Nothing waits for completion in the linux kernel. That would prevent multiple processes from running properly. Issue the I/O and interrupt on completion. Queues allow you to submit multiple I/Os without having to worry about whether previous operations have completed. Have a look at https://www.oreilly.com/openbook/linuxdrive3/book/
 
  


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