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authormarius <marius@FreeBSD.org>2011-10-01 00:31:30 +0000
committermarius <marius@FreeBSD.org>2011-10-01 00:31:30 +0000
commite7b8707889cd9e6ca8956bb963fd977166909c71 (patch)
treeb382e60e9cb00b7e563a71b09a1f8f04df28ce29 /sys/sparc64/pci
parent1b77ae249ca0edabd3f169fa5c06103f5d573874 (diff)
downloadFreeBSD-src-e7b8707889cd9e6ca8956bb963fd977166909c71.zip
FreeBSD-src-e7b8707889cd9e6ca8956bb963fd977166909c71.tar.gz
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.
Diffstat (limited to 'sys/sparc64/pci')
-rw-r--r--sys/sparc64/pci/schizo.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/sys/sparc64/pci/schizo.c b/sys/sparc64/pci/schizo.c
index 4d1a5a7..3d147c8 100644
--- a/sys/sparc64/pci/schizo.c
+++ b/sys/sparc64/pci/schizo.c
@@ -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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