linux-kernel - [PATCH] soc: fsl: dpio: Prefer the CPU affine DPIO

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Date:   Fri, 24 Apr 2020 14:51:12 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     leoyang.li@....com
Cc:     linux-kernel@...r.kernel.org, Roy Pledge <roy.pledge@....com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH] soc: fsl: dpio: Prefer the CPU affine DPIO

From: Roy Pledge <roy.pledge@....com>

Use the cpu affine DPIO unless there isn't one which can happen
if less DPIOs than cores are assign to the kernel.

Signed-off-by: Roy Pledge <roy.pledge@....com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/soc/fsl/dpio/dpio-service.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
index cd4f6410e8c2..f1080c7a3fe1 100644
--- a/drivers/soc/fsl/dpio/dpio-service.c
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -58,7 +58,7 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
 	 * If cpu == -1, choose the current cpu, with no guarantees about
 	 * potentially being migrated away.
 	 */
-	if (unlikely(cpu < 0))
+	if (cpu < 0)
 		cpu = smp_processor_id();
 
 	/* If a specific cpu was requested, pick it up immediately */
@@ -70,6 +70,10 @@ static inline struct dpaa2_io *service_select(struct dpaa2_io *d)
 	if (d)
 		return d;
 
+	d = service_select_by_cpu(d, -1);
+	if (d)
+		return d;
+
 	spin_lock(&dpio_list_lock);
 	d = list_entry(dpio_list.next, struct dpaa2_io, node);
 	list_del(&d->node);
-- 
2.17.1