[PATCH 1/4] drm/amdkfd: refine event_interrupt_poison_consumption

[Tao Zhou]

Combine reading and setting poison flag as one atomic operation
and add print message for the function.

Signed-off-by: Tao Zhou <tao.zhou1 at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c b/drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c
index 7eedbcd14828..a992798ff8b6 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c
@@ -93,20 +93,19 @@ enum SQ_INTERRUPT_ERROR_TYPE {
 static void event_interrupt_poison_consumption(struct kfd_dev *dev,
 				uint16_t pasid, uint16_t source_id)
 {
-	int ret = -EINVAL;
+	int old_poison, ret = -EINVAL;
 	struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
 
 	if (!p)
 		return;
 
 	/* all queues of a process will be unmapped in one time */
-	if (atomic_read(&p->poison)) {
-		kfd_unref_process(p);
+	old_poison = atomic_cmpxchg(&p->poison, 0, 1);
+	kfd_unref_process(p);
+	if (old_poison)
 		return;
-	}
 
-	atomic_set(&p->poison, 1);
-	kfd_unref_process(p);
+	pr_warn("RAS poison consumption handling\n");
 
 	switch (source_id) {
 	case SOC15_INTSRC_SQ_INTERRUPT_MSG:
-- 
2.35.1