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authorFrank Haverkamp <haver@linux.vnet.ibm.com>2014-09-10 18:37:53 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-24 10:15:47 +0400
commit1451f414639465995dfc1f820aa1a64723cbd662 (patch)
treed1983ab9e5d532368ad82261295a78c114fa8514 /drivers/misc/genwqe/card_debugfs.c
parent08e4906cc29d092ae2da0ff089efe1488e584d3c (diff)
downloadlinux-1451f414639465995dfc1f820aa1a64723cbd662.tar.xz
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.c6
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"