Author: marius
Date: Sat Oct 1 00:31:30 2011
New Revision: 225891
URL: http://svn.freebsd.org/changeset/base/225891
Log:
Re-reading the Schizo errata suggests that it's actually tolerable to
also use the streaming buffer of pre version 5/revision 2.3 hardware as
long as we stay away from context flushes (which iommu(4) so far doesn't
take advantage of). OpenSolaris does the same.
Modified:
head/sys/sparc64/pci/schizo.c
Modified: head/sys/sparc64/pci/schizo.c
==============================================================================
--- head/sys/sparc64/pci/schizo.c Sat Oct 1 00:22:24 2011
(r225890)
+++ head/sys/sparc64/pci/schizo.c Sat Oct 1 00:31:30 2011
(r225891)
@@ -501,7 +501,8 @@ schizo_attach(device_t dev)
* Set up the IOMMU. Schizo, Tomatillo and XMITS all have
* one per PBM. Schizo and XMITS additionally have a streaming
* buffer, in Schizo version < 5 (i.e. revision < 2.3) it's
- * affected by several errata and basically unusable though.
+ * affected by several errata though. However, except for context
+ * flushes, taking advantage of it should be okay even with those.
*/
memcpy(&sc->sc_dma_methods, &iommu_dma_methods,
sizeof(sc->sc_dma_methods));
@@ -509,8 +510,7 @@ schizo_attach(device_t dev)
sc->sc_is.sis_is.is_flags = IOMMU_PRESERVE_PROM;
sc->sc_is.sis_is.is_pmaxaddr = IOMMU_MAXADDR(STX_IOMMU_BITS);
sc->sc_is.sis_is.is_sb[0] = sc->sc_is.sis_is.is_sb[1] = 0;
- if (OF_getproplen(node, "no-streaming-cache") < 0 &&
- !(sc->sc_mode == SCHIZO_MODE_SCZ && sc->sc_ver < 5))
+ if (OF_getproplen(node, "no-streaming-cache") < 0)
sc->sc_is.sis_is.is_sb[0] = STX_PCI_STRBUF;
#define TSBCASE(x)
\
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