Date: Mon, 18 May 2009 18:37:18 +0000 (UTC) From: Marcel Moolenaar <marcel@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/amd64/amd64 machdep.c src/sys/arm/arm machdep.c src/sys/dev/md md.c src/sys/i386/i386 machdep.c src/sys/ia64/ia64 machdep.c src/sys/mips/mips machdep.c src/sys/nfs nfs_common.c src/sys/pc98/pc98 machdep.c ... Message-ID: <200905181837.n4IIbx8J077108@repoman.freebsd.org>
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marcel 2009-05-18 18:37:18 UTC
FreeBSD src repository
Modified files:
sys/amd64/amd64 machdep.c
sys/arm/arm machdep.c
sys/dev/md md.c
sys/i386/i386 machdep.c
sys/ia64/ia64 machdep.c
sys/mips/mips machdep.c
sys/nfs nfs_common.c
sys/pc98/pc98 machdep.c
sys/powerpc/aim machdep.c
sys/powerpc/booke machdep.c
sys/sparc64/sparc64 machdep.c
sys/sun4v/sun4v machdep.c
sys/sys systm.h
Log:
SVN rev 192323 on 2009-05-18 18:37:18Z by marcel
Add cpu_flush_dcache() for use after non-DMA based I/O so that a
possible future I-cache coherency operation can succeed. On ARM
for example the L1 cache can be (is) virtually mapped, which
means that any I/O that uses temporary mappings will not see the
I-cache made coherent. On ia64 a similar behaviour has been
observed. By flushing the D-cache, execution of binaries backed
by md(4) and/or NFS work reliably.
For Book-E (powerpc), execution over NFS exhibits SIGILL once in
a while as well, though cpu_flush_dcache() hasn't been implemented
yet.
Doing an explicit D-cache flush as part of the non-DMA based I/O
read operation eliminates the need to do it as part of the
I-cache coherency operation itself and as such avoids pessimizing
the DMA-based I/O read operations for which D-cache are already
flushed/invalidated. It also allows future optimizations whereby
the bcopy() followed by the D-cache flush can be integrated in a
single operation, which could be implemented using on-chips DMA
engines, by-passing the D-cache altogether.
Revision Changes Path
1.701 +10 -0 src/sys/amd64/amd64/machdep.c
1.33 +12 -0 src/sys/arm/arm/machdep.c
1.181 +6 -3 src/sys/dev/md/md.c
1.684 +10 -0 src/sys/i386/i386/machdep.c
1.243 +15 -0 src/sys/ia64/ia64/machdep.c
1.13 +10 -0 src/sys/mips/mips/machdep.c
1.120 +3 -2 src/sys/nfs/nfs_common.c
1.411 +10 -0 src/sys/pc98/pc98/machdep.c
1.126 +10 -0 src/sys/powerpc/aim/machdep.c
1.16 +10 -0 src/sys/powerpc/booke/machdep.c
1.153 +10 -0 src/sys/sparc64/sparc64/machdep.c
1.20 +10 -0 src/sys/sun4v/sun4v/machdep.c
1.275 +1 -0 src/sys/sys/systm.h
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