s390/qdio: let drivers opt-out from Output Queue scanning

Browse source

If a driver wants to use the new Output Queue poll code, then the qdio
layer must disable its internal Queue scanning. Let the driver select
this mode by passing a special scan_threshold of 0.

As the scan_threshold is the same for all Output Queues, also move it
into the main qdio_irq struct. This allows for fast opt-out checking, a
driver is expected to operate either _all_ or none of its Output Queues
in polling mode.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Julian Wiedmann 2019-08-23 11:48:48 +02:00 • committed by David S. Miller

parent 7c47f5afde

commit 313dc689b1

4 changed files with 11 additions and 7 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/s390/include/asm/qdio.h

View file

3

drivers/s390/cio/qdio.h

View file

11

drivers/s390/cio/qdio_main.c

View file

2

drivers/s390/cio/qdio_setup.c

View file