Date: Sat, 28 Jan 2012 23:26:56 +0000 (UTC) From: Marius Strobl <marius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r230678 - stable/8/sys/sparc64/pci Message-ID: <201201282326.q0SNQug5004143@svn.freebsd.org>
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Author: marius Date: Sat Jan 28 23:26:55 2012 New Revision: 230678 URL: http://svn.freebsd.org/changeset/base/230678 Log: MFC: r225891 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: stable/8/sys/sparc64/pci/schizo.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) Modified: stable/8/sys/sparc64/pci/schizo.c ============================================================================== --- stable/8/sys/sparc64/pci/schizo.c Sat Jan 28 23:26:50 2012 (r230677) +++ stable/8/sys/sparc64/pci/schizo.c Sat Jan 28 23:26:55 2012 (r230678) @@ -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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