On Thu, Jul 22, 2021 at 11:55:58PM +0100, Wedson Almeida Filho wrote: > Hey Matthew, > > On Thu, Jul 08, 2021 at 01:58:32AM +0100, Matthew Wilcox wrote: > > Why are you so resistant to writing a real driver that deals with actual > > hardware? > > I don't think it was so much resistance but rather a prioritisation thing. Have > you by any chance seen the gpio driver I posted a couple of days ago? I haven't seen it, no ... > > A simple NVMe driver is less than a thousand lines of C. > > I know the one in the kernel now is ridiculously complicated and has > > been thoroughly messed up with abstractions to support NVMeoF instead > > of having a separate driver, but it's really a simple interface at heart. > > The latest NVMe spec is 452 pages long, which seems to contradict your claim > that it's simple. As I said, they've put all kinds of crap into NVMe these days. If you look at the 1.0e spec, it's 127 pages. > In any case, translating less than 1K lines of C shouldn't be > too hard (after I've built the abstractions, of course). Would you mind sharing > the simple driver you mention above? Unfortunately, most of the early versions were lost during the kernel.org breakin. If you check out commit 5da273fe3fd1 and look at drivers/block/nvme.c, you'll see a driver that's about 2000 lines.
