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authorJens Axboe <axboe@fb.com>2017-04-28 07:54:06 -0600
committerJens Axboe <axboe@fb.com>2017-05-02 07:52:08 -0600
commitbaed548a98397f57a71d61917177f7d42ab17881 (patch)
tree0e8a717cea2da2f7a40f468fd6d80add778f1c43 /drivers/block
parent8afdd94c74e416de74a8ee61d79e4bf93466420b (diff)
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 <Bart.VanAssche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/mtip32xx/mtip32xx.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 36f3d34f2156..aee94f260725 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));