From c6f99c947f8386ed5ae6dde155cbed450dde9f5b Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 28 Apr 2017 07:54:06 -0600 Subject: [PATCH] mtip32xx: abstract out "are any commands active" helper This is a prep patch for backoff in ->queue_rq() for non-ncq commands. Reviewed-by: Bart Van Assche Reviewed-by: Christoph Hellwig Tested-by: Ming Lei Signed-off-by: Jens Axboe --- drivers/block/mtip32xx/mtip32xx.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index 36f3d34f21566..aee94f2607255 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -1030,6 +1030,22 @@ static bool mtip_pause_ncq(struct mtip_port *port, return false; } +static bool mtip_commands_active(struct mtip_port *port) +{ + unsigned int active; + unsigned int n; + + /* + * Ignore s_active bit 0 of array element 0. + * This bit will always be set + */ + active = readl(port->s_active[0]) & 0xFFFFFFFE; + for (n = 1; n < port->dd->slot_groups; n++) + active |= readl(port->s_active[n]); + + return active != 0; +} + /* * Wait for port to quiesce * @@ -1043,8 +1059,7 @@ static bool mtip_pause_ncq(struct mtip_port *port, static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout) { unsigned long to; - unsigned int n; - unsigned int active = 1; + bool active = true; blk_mq_stop_hw_queues(port->dd->queue); @@ -1061,14 +1076,7 @@ static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout) if (mtip_check_surprise_removal(port->dd->pdev)) goto err_fault; - /* - * Ignore s_active bit 0 of array element 0. - * This bit will always be set - */ - active = readl(port->s_active[0]) & 0xFFFFFFFE; - for (n = 1; n < port->dd->slot_groups; n++) - active |= readl(port->s_active[n]); - + active = mtip_commands_active(port); if (!active) break; } while (time_before(jiffies, to)); -- 2.39.5