diff options
| author | Frank Haverkamp <haver@linux.vnet.ibm.com> | 2014-09-10 16:37:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-24 08:15:47 +0200 |
| commit | 1451f414639465995dfc1f820aa1a64723cbd662 (patch) | |
| tree | d1983ab9e5d532368ad82261295a78c114fa8514 /drivers/misc/genwqe/card_debugfs.c | |
| parent | GenWQE: Fix problem when reading HSI and Retc (diff) | |
| download | linux-1451f414639465995dfc1f820aa1a64723cbd662.tar.xz linux-1451f414639465995dfc1f820aa1a64723cbd662.zip | |
GenWQE: Support blocking when DDCB queue is busy
When the GenWQE hardware queue was busy, the driver returned simply
-EBUSY. This caused polling by applications which increased the load
on the already busy system. This change implements the possiblity to
sleep on a waitqueue instead when the DDCB queue is busy. The
requestor is woken up when there is free space on the queue again.
The old way to get -EBUSY is still available if the device is openend
with O_NONBLOCKING. The default is now blocking behavior.
Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/genwqe/card_debugfs.c')
| -rw-r--r-- | drivers/misc/genwqe/card_debugfs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/misc/genwqe/card_debugfs.c b/drivers/misc/genwqe/card_debugfs.c index 40b425d35866..c715534e7fe7 100644 --- a/drivers/misc/genwqe/card_debugfs.c +++ b/drivers/misc/genwqe/card_debugfs.c @@ -244,14 +244,16 @@ static int genwqe_ddcb_info_show(struct seq_file *s, void *unused) " ddcbs_in_flight: %u\n" " ddcbs_max_in_flight: %u\n" " ddcbs_completed: %u\n" - " busy: %u\n" + " return_on_busy: %u\n" + " wait_on_busy: %u\n" " irqs_processed: %u\n", queue->ddcb_max, (long long)queue->ddcb_daddr, (long long)queue->ddcb_daddr + (queue->ddcb_max * DDCB_LENGTH), (long long)queue->ddcb_vaddr, queue->ddcbs_in_flight, queue->ddcbs_max_in_flight, queue->ddcbs_completed, - queue->busy, cd->irqs_processed); + queue->return_on_busy, queue->wait_on_busy, + cd->irqs_processed); /* Hardware State */ seq_printf(s, " 0x%08x 0x%016llx IO_QUEUE_CONFIG\n" |