Date: Wed, 19 Nov 2008 22:09:03 +0000 (UTC) From: Marius Strobl <marius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r185108 - head/sys/dev/dcons Message-ID: <200811192209.mAJM933q029939@svn.freebsd.org>
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Author: marius Date: Wed Nov 19 22:09:03 2008 New Revision: 185108 URL: http://svn.freebsd.org/changeset/base/185108 Log: Given that the buffer dcons_crom(4) exposes is used for both input and output, set BUS_DMA_COHERENT when creating the DMA map used for loading the buffer. As a side-effect this solves locking issues on sparc64 when dcons(4) calls bus_dmamap_sync(9) while in an interrupt filter, which are executed in a critical section, and iommu(4) has to use a sleep lock when taking advantage of the streaming buffer. Reported and tested by: kensmith Approved by: simokawa Modified: head/sys/dev/dcons/dcons_crom.c Modified: head/sys/dev/dcons/dcons_crom.c ============================================================================== --- head/sys/dev/dcons/dcons_crom.c Wed Nov 19 21:12:26 2008 (r185107) +++ head/sys/dev/dcons/dcons_crom.c Wed Nov 19 22:09:03 2008 (r185108) @@ -229,7 +229,7 @@ dcons_crom_attach(device_t dev) /*lockarg*/&Giant, #endif &sc->dma_tag); - bus_dmamap_create(sc->dma_tag, 0, &sc->dma_map); + bus_dmamap_create(sc->dma_tag, BUS_DMA_COHERENT, &sc->dma_map); bus_dmamap_load(sc->dma_tag, sc->dma_map, (void *)dcons_conf->buf, dcons_conf->size, dmamap_cb, sc, 0);
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