Date: Mon, 11 Jun 2018 17:18:05 +0530 From: Pratyush Yadav <pratyush@freebsd.org> To: soc-status@freebsd.org Cc: Edward Napierala <trasz@freebsd.org>, Akshay Jaggi <jaggi@freebsd.org> Subject: [Week 4] Import the Xen grant-table bus_dma(9) handlers from OpenBSD Message-ID: <CA%2BX=3TJy72iS87jWvVG%2BZmDfZs=ytJ0zqSO5=MpN6KPBLsmTzg@mail.gmail.com>
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Hi, This week I finished up my implementation of the xen-specific bus_dma(9) handlers. I asked Roger Pau Monne for review. After his review, I realized I had been doing things a little wrong. I was building the Xen-specific handlers on top of the bus_dma(9) interface. Instead, I should have created an alternate busdma implementation, kind of like sys/x86/iommu/busdma_dmar.c So I had to study the inner details of the bus_dma(9) interface to learn how an alternate implementation can be written. This was a little confusing at the beginning.because there is no clear guide on the subsystem for beginners like me. But eventually, I got the hang of it, mostly by reading code already written. After that came the task of rewriting my implementation. I wrote it, and then spent a couple of days refining it. Today, I submitted it to Roger again for review. We are discussing it as of now. No major concerns have been raised so I should be done with the xen-specific busdma hooks in a few days. You can check out the code at [0]. I maintain a blog on Blogger where I publish my progress every few days. Check it out if you want more details on what I'm doing [1]. [0] https://github.com/prati0100/freebsd [1] http://pratyushgsoc.blogspot.in/2018/05/import-xen-grant-table-busdma9-handlers.html -- Regards, Pratyush Yadav
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