From: Oded Gabbay <oded.gabbay@amd.com>
Date: Thu, 15 Jan 2015 10:01:10 +0000 (+0200)
Subject: drm/amdkfd: Replace cpu_relax() with schedule() in DQM
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=99331a51cc788cb60780278cf2d6b1105cf23828;p=linux-beck.git

drm/amdkfd: Replace cpu_relax() with schedule() in DQM

In order not to occupy the current core and thus prevent the core from
servicing IOMMU PPR requests, this patch replaces the call in DQM to
cpu_relax() with a call to schedule().

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index fad6877d33ad..e804e871ff82 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -26,6 +26,7 @@
 #include <linux/types.h>
 #include <linux/printk.h>
 #include <linux/bitops.h>
+#include <linux/sched.h>
 #include "kfd_priv.h"
 #include "kfd_device_queue_manager.h"
 #include "kfd_mqd_manager.h"
@@ -829,7 +830,7 @@ static int fence_wait_timeout(unsigned int *fence_addr,
 			pr_err("kfd: qcm fence wait loop timeout expired\n");
 			return -ETIME;
 		}
-		cpu_relax();
+		schedule();
 	}
 
 	return 0;