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[S390] qdio: EQBS retry after CCQ 96
authorJan Glauber <jang@linux.vnet.ibm.com>
Sun, 30 Oct 2011 14:17:06 +0000 (15:17 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Sun, 30 Oct 2011 14:16:45 +0000 (15:16 +0100)
commit25f269f17316549e026c5dd0db7526411a504de6
tree05897a8a28ff4cd6e81cc7ef12da405ab820c4f3tree | snapshot (tar.gz zip)
parenta2b86019826cb97fd964fbaf101410c64cd78681commit | diff
[S390] qdio: EQBS retry after CCQ 96

Running under z/VM with QIOASSIST enabled, qdio queues could stall if EQBS
did not extract all SBAL states. Add an instant retry for EQBS and, if the
retry fails, set up a timer to ensure outstanding SBALs are processed later.

While at it, optimize qdio_do_eqbs and qdio_do_sqbs to eliminate 3 jumps on
the hot path.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
drivers/s390/cio/qdio_main.c diff | blob | blame | history