Date: Wed, 9 Jul 2014 10:10:33 -0600 From: Warner Losh <imp@bsdimp.com> To: Bruce Evans <brde@optusnet.com.au> Cc: arch@freebsd.org, Don Lewis <truckman@freebsd.org>, adrian@freebsd.org Subject: Re: [patch] axe RF_TIMESHARE? Message-ID: <2174B753-A1C9-4F8A-8E25-28612030AF78@bsdimp.com> In-Reply-To: <20140709200848.Q1201@besplex.bde.org> References: <201407082254.s68MsaPS028312@gw.catspoiler.org> <20140709200848.Q1201@besplex.bde.org>
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[-- Attachment #1 --] On Jul 9, 2014, at 4:08 AM, Bruce Evans <brde@optusnet.com.au> wrote: > RF_TIMESHARE doesn't simplify this significantly. Ownership of the > interrupt should be claimed somewhere so that the interrupt resource > is available at first open time. That can probably be done using > a super-device or some hack to own the interrupt by the first device > that can share it. Then you don't need a flag for it. It seems too > hard (bloated) to generalize RF_TIMESHARE so that all of the OUT2 > complications can be handled at the new-bus level. I think that, while interesting, none of this has a bearing on RF_TIMESHARE. For shared interrupts, we’ve used RF_SHARED for a long time. I don’t think anybody ever actually implemented RF_TIMESHARE apart from an aborted attempt by the ppcbus code which later wound up abandoning that effort (I think before it even made it into the tree). It was an interesting concept, but we never used it and I think we can light a bonfire under it. There are other ways to share resources that have been used instead... Warner [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJTvWl5AAoJEGwc0Sh9sBEAHKgP/jHjvXmVcwX1QP56QNjf5kf1 95Bf8jMeI4KHkeZmrotKsl4YLfeCEpn74wEDnnXi5V22xFrZYsEh9xxOWIjNKjbq Og+hNhTjgFGzkE6U5oB6mLPMxzIgBWD28vxUVhu+1AU3PLXxmnXDeXf3r+dMrOgX jbu09r+40AKdTGIESzyPv2AAM56Hi4xIyUofIfacG4VbHHXioMsYssxdNqTqM+rf lHr511IypQcadjE3o1lFZvRtYg1T33AppRQolvv2loylm2XTbJsvHg/ibPi3k0sm tp/cn15Ye1r/uhOFf3gdJwVPBx2Bbr2RrbImmyxBRNspgJ31uXAy5iq1yzmJG1Au XKgBe70WIFNKGcYiSKQHC+GmwERChlsmTiA7MefaN0RyBFtsirrS2I5cNfUCJbQw MPe9XIaayqQ9gv7rjpWjeNpB3OBXAdWZD32vF1TAS18/DKFEm2h1g9ch1CjCWTm+ tniq2L75H9Xtzm8TbrdpNYu8aicOaQ/gQno54uU9Fx+eN9owDG3ZvdenBDcBos6b LY6kVx+El2SwpAxDfQV7m8kEAZPknugEydDqI4kEJPU7G+fMVCTUS8Q739+SJfuR PWma2EunIAbTfcUqfuF0RWUNBKGa1XEYTpAQFhQSlXyUkMt8c9BUvp8XN6PFdJ/L DcW5PymqsHdfDIk00YeA =L2ml -----END PGP SIGNATURE-----
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