From owner-freebsd-current Thu Apr 4 22:24:17 2002 Delivered-To: freebsd-current@freebsd.org Received: from beppo.feral.com (beppo.feral.com [192.67.166.79]) by hub.freebsd.org (Postfix) with ESMTP id 53A5337B41B for ; Thu, 4 Apr 2002 22:24:12 -0800 (PST) Received: from mailhost.feral.com (mjacob@mailhost.feral.com [192.67.166.1]) by beppo.feral.com (8.11.3/8.11.3) with ESMTP id g356O5f85133; Thu, 4 Apr 2002 22:24:05 -0800 (PST) (envelope-from mjacob@feral.com) Date: Thu, 4 Apr 2002 22:24:05 -0800 (PST) From: Matthew Jacob X-Sender: mjacob@beppo Reply-To: mjacob@feral.com To: "Justin T. Gibbs" Cc: Terry Lambert , Andrew Gallatin , freebsd-current@freebsd.org Subject: Re: BUS_SPACE_MAXSIZE & isp driver. In-Reply-To: <200204050452.g354qV972436@aslan.scsiguy.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Thu, 4 Apr 2002, Justin T. Gibbs wrote: > >> a single buffer. I never realized that there was such controversy > >> over this value... it was just put in so that I could have something > >> for the non-GNUC case. > > > >Yeah, but, uh, it'll blow up in one's face..... > > If it gets compiled, I suppose so. > > >The question I have is what *should* we be using? Should BUS_SPACE_MAXSIZE be > >bumped up so that any dma allocation we attempt for a platform will fit within > >it? > > I think it should go away. We should malloc space to hold the segments in > the leaf dma tags and base that size on the information in the tag. The > segments would only be allocated on the first dma_map_create call on a > tag so that intermediate (i.e. non-leaf) tags never have this stuff allocated. But lacking that, what does it mean? > > >I mean, it's used in a lot of places, so clearly it must mean something, > >right? What are the semantics here? > > Is it really used in a lot of places? About 40 files. But everyone has copied them. > I've always used the "bit sized" > versions of MAXSIZE in my driver code, never the ambiguous one. 8-) > > -- > Justin > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message