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Apply DMA address space restriction to controllers that have 4GB

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DMA boundary bug and runs with PCI-X mode.  watchdog timeout was
observed on BCM5704 which lives behind certain PCI-X bridge(e.g.
AMD 8131 PCI-X bridge).  It's still not clear whether the root
cause came from that PCI-X bridge or not. The watchdog timeout
indicates the issue is in TX path. If the bridge reorders TX
mailbox write accesses it would generate all kinds of problems but
I'm not sure.  This should be revisited.

Tested by:	Michael L. Squires (mikes <> siralan dot org)
This commit is contained in:
Pyun YongHyeon 2011-01-10 17:45:09 +00:00
parent 92c0b021ce
commit d2ffe15ae0
1 changed files with 11 additions and 1 deletions
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12
sys/dev/bge/if_bge.c
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@ -2473,8 +2473,18 @@ bge_dma_alloc(struct bge_softc *sc)
/* Create parent tag for buffers. */
boundary = 0;
if ((sc->bge_flags & BGE_FLAG_4G_BNDRY_BUG) != 0)
if ((sc->bge_flags & BGE_FLAG_4G_BNDRY_BUG) != 0) {
boundary = BGE_DMA_BNDRY;
/*
* XXX
* watchdog timeout issue was observed on BCM5704 which
* lives behind PCI-X bridge(e.g AMD 8131 PCI-X bridge).
* Limiting DMA address space to 32bits seems to address
* it.
*/
if (sc->bge_flags & BGE_FLAG_PCIX)
lowaddr = BUS_SPACE_MAXADDR_32BIT;
}
error = bus_dma_tag_create(bus_get_dma_tag(sc->bge_dev),
1, boundary, lowaddr, BUS_SPACE_MAXADDR, NULL,
NULL, BUS_SPACE_MAXSIZE_32BIT, 0, BUS_SPACE_MAXSIZE_32BIT,