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 fad6877d33ad8ae2c571c426a0384b407c3f0a97..e804e871ff82965bddf5a2a3fbbb62e1ac00b8ff 100644 (file)
--- 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;