Date: Thu, 09 Mar 2000 23:42:44 -0800 From: Mike Smith <msmith@freebsd.org> To: mjacob@feral.com Cc: Mike Smith <msmith@FreeBSD.ORG>, alpha@FreeBSD.ORG Subject: Re: problem with bus_dmamap_destroy? Message-ID: <200003100742.XAA00848@mass.cdrom.com> In-Reply-To: Your message of "Thu, 09 Mar 2000 23:29:00 PST." <Pine.BSF.4.10.10003092325290.30095-100000@beppo.feral.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? If I bracket the bus_dmamap_destroy with printfs, I get the first but not the second one. I guess I need to go get busy then. Thanks! > 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 > > > > -- \\ 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
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