linux-kernel - [PATCH AUTOSEL 5.5 131/542] drm/amdkfd: Fix a bug in SDMA RLC queue counting under HWS mode

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Date:   Fri, 14 Feb 2020 10:42:03 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yong Zhao <Yong.Zhao@....com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.5 131/542] drm/amdkfd: Fix a bug in SDMA RLC queue counting under HWS mode

From: Yong Zhao <Yong.Zhao@....com>

[ Upstream commit f38abc15d157b7b31fa7f651dc8bf92858c963f8 ]

The sdma_queue_count increment should be done before
execute_queues_cpsch(), which calls pm_calc_rlib_size() where
sdma_queue_count is used to calculate whether over_subscription is
triggered.

With the previous code, when a SDMA queue is created,
compute_queue_count in pm_calc_rlib_size() is one more than the
actual compute queue number, because the queue_count has been
incremented while sdma_queue_count has not. This patch fixes that.

Signed-off-by: Yong Zhao <Yong.Zhao@....com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

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 984c2f2b24b60..d128a8bbe19d0 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -1225,16 +1225,18 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
 
 	list_add(&q->list, &qpd->queues_list);
 	qpd->queue_count++;
+
+	if (q->properties.type == KFD_QUEUE_TYPE_SDMA)
+		dqm->sdma_queue_count++;
+	else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
+		dqm->xgmi_sdma_queue_count++;
+
 	if (q->properties.is_active) {
 		dqm->queue_count++;
 		retval = execute_queues_cpsch(dqm,
 				KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
 	}
 
-	if (q->properties.type == KFD_QUEUE_TYPE_SDMA)
-		dqm->sdma_queue_count++;
-	else if (q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
-		dqm->xgmi_sdma_queue_count++;
 	/*
 	 * Unconditionally increment this counter, regardless of the queue's
 	 * type or whether the queue is active.
-- 
2.20.1