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powerpc/powernv: Restrict the busdma tag to only POWER8

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It seems this tag is causing problems on POWER9 systems.  Since no POWER9 user
has encountered the problem fixed by r339589 just restrict it to POWER8 for now.
A better fix will likely be to update powerpc/busdma_machdep.c to handle the
window correctly.

Reported by:	mmacy, others
This commit is contained in:
Justin Hibbits 2018-11-08 20:31:12 +00:00
parent 2bfaf585ca
commit ad39591ad2
1 changed files with 20 additions and 14 deletions
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34
sys/powerpc/powernv/opal_pci.c
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@ -433,20 +433,26 @@ opalpci_attach(device_t dev)
}
/* Create the parent DMA tag */
err = bus_dma_tag_create(bus_get_dma_tag(dev), /* parent */
1, 0, /* alignment, bounds */
OPAL_PCI_BUS_SPACE_LOWADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR_32BIT, /* highaddr */
NULL, NULL, /* filter, filterarg */
BUS_SPACE_MAXSIZE, /* maxsize */
BUS_SPACE_UNRESTRICTED, /* nsegments */
BUS_SPACE_MAXSIZE, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->ofw_sc.sc_dmat);
if (err != 0) {
device_printf(dev, "Failed to create DMA tag\n");
return (err);
/*
* Constrain it to POWER8 PHB (ioda2) for now. It seems to mess up on
* POWER9 systems.
*/
if (ofw_bus_is_compatible(dev, "ibm,ioda2-phb")) {
err = bus_dma_tag_create(bus_get_dma_tag(dev), /* parent */
1, 0, /* alignment, bounds */
OPAL_PCI_BUS_SPACE_LOWADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR_32BIT, /* highaddr */
NULL, NULL, /* filter, filterarg */
BUS_SPACE_MAXSIZE, /* maxsize */
BUS_SPACE_UNRESTRICTED, /* nsegments */
BUS_SPACE_MAXSIZE, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->ofw_sc.sc_dmat);
if (err != 0) {
device_printf(dev, "Failed to create DMA tag\n");
return (err);
}
}
/*