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

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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
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2
arch/s390/include/asm/qdio.h
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@@ -359,7 +359,7 @@ struct qdio_initialize {
qdio_handler_t *output_handler;
void (**queue_start_poll_array) (struct ccw_device *, int,
unsigned long);
int scan_threshold;
unsigned int scan_threshold;
unsigned long int_parm;
struct qdio_buffer **input_sbal_addr_array;
struct qdio_buffer **output_sbal_addr_array;