Date: Thu, 9 Mar 2000 23:29:00 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: alpha@FreeBSD.ORG Subject: Re: problem with bus_dmamap_destroy? Message-ID: <Pine.BSF.4.10.10003092325290.30095-100000@beppo.feral.com> In-Reply-To: <200003100658.WAA00620@mass.cdrom.com>
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No, I believe the first BUS_SPACE_MAXADDR is fine- When you say "hang", hang where? Unless you've marked this device as BUS_DMA_ISA (where it *might* hang in sgmap_free_region), it would have to hang in free()- are you sure it's actually hanging and you don't have some loop where it's trying to destroy the map when there are still loaded pages? On Thu, 9 Mar 2000, Mike Smith wrote: > > Just wondering if anyone's seen a problem with bus_dmamap_destroy() > hanging on the Alpha. I've tracked down a hang when unloading the Mylex > driver which doesn't maifest on the i386. > > error = bus_dma_tag_create(sc->mlx_parent_dmat, /* parent */ > 1, 0, /* alignment, boundary */ > BUS_SPACE_MAXADDR, /* lowaddr */ > BUS_SPACE_MAXADDR, /* highaddr */ > NULL, NULL, /* filter, filterarg */ > MAXBSIZE, MLX_NSEG, /* maxsize, nsegments */ > BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */ > 0, /* flags */ > &sc->mlx_buffer_dmat); > > ... > bus_dmamap_create(sc->mlx_buffer_dmat, 0, &mc->mc_dmamap); > ... > bus_dmamap_destroy(sc->mlx_buffer_dmat, mc->mc_dmamap); > > I've had someone suggest that the lowaddr parameter should be 0; is this > actually correct? (The DMA mapping does otherwise seem to work...) > > Any "been there, done that" suggestions before I dig into this? > > Thanks. > > -- > \\ Give a man a fish, and you feed him for a day. \\ Mike Smith > \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org > \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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