linux-kernel - [PATCH AUTOSEL 6.0 24/30] drm/amdgpu: Adjust MES polling timeout for sriov

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Date:   Sun,  6 Nov 2022 12:03:36 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yiqing Yao <yiqing.yao@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        Jack.Xiao@....com, Hawking.Zhang@....com, Graham.Sider@....com,
        yifan1.zhang@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.0 24/30] drm/amdgpu: Adjust MES polling timeout for sriov

From: Yiqing Yao <yiqing.yao@....com>

[ Upstream commit 226dcfad349f23f7744d02b24f8ec3bc4f6198ac ]

[why]
MES response time in sriov may be longer than default value
due to reset or init in other VF. A timeout value specific
to sriov is needed.

[how]
When in sriov, adjust the timeout value to calculated
worst case scenario.

Signed-off-by: Yiqing Yao <yiqing.yao@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/mes_v11_0.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
index f92744b8d79d..e758b4083874 100644
--- a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
@@ -96,7 +96,14 @@ static int mes_v11_0_submit_pkt_and_poll_completion(struct amdgpu_mes *mes,
 	struct amdgpu_device *adev = mes->adev;
 	struct amdgpu_ring *ring = &mes->ring;
 	unsigned long flags;
+	signed long timeout = adev->usec_timeout;
 
+	if (amdgpu_emu_mode) {
+		timeout *= 100;
+	} else if (amdgpu_sriov_vf(adev)) {
+		/* Worst case in sriov where all other 15 VF timeout, each VF needs about 600ms */
+		timeout = 15 * 600 * 1000;
+	}
 	BUG_ON(size % 4 != 0);
 
 	spin_lock_irqsave(&mes->ring_lock, flags);
@@ -116,7 +123,7 @@ static int mes_v11_0_submit_pkt_and_poll_completion(struct amdgpu_mes *mes,
 	DRM_DEBUG("MES msg=%d was emitted\n", x_pkt->header.opcode);
 
 	r = amdgpu_fence_wait_polling(ring, ring->fence_drv.sync_seq,
-		      adev->usec_timeout * (amdgpu_emu_mode ? 100 : 1));
+		      timeout);
 	if (r < 1) {
 		DRM_ERROR("MES failed to response msg=%d\n",
 			  x_pkt->header.opcode);
-- 
2.35.1