linux-kernel - [PATCH AUTOSEL 5.19 11/29] drm/amdgpu/mes: zero the sdma_hqd

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Date:   Sun,  2 Oct 2022 18:49:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yifan Zhang <yifan1.zhang@....com>, Tim Huang <Tim.Huang@....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, le.ma@....com,
        mukul.joshi@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.19 11/29] drm/amdgpu/mes: zero the sdma_hqd_mask of 2nd SDMA engine for SDMA 6.0.1

From: Yifan Zhang <yifan1.zhang@....com>

[ Upstream commit 0af4ed0c329ebb4cef95fda4fcdbfcdea0255442 ]

there is only one SDMA engine in SDMA 6.0.1, the sdma_hqd_mask has to be
zeroed for the 2nd engine, otherwise MES scheduler will consider 2nd
engine exists and map/unmap SDMA queues to the non-existent engine.

Signed-off-by: Yifan Zhang <yifan1.zhang@....com>
Reviewed-by: Tim Huang <Tim.Huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
index 69a70a0aaed9..6ab062c63da1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
@@ -169,6 +169,9 @@ int amdgpu_mes_init(struct amdgpu_device *adev)
 	for (i = 0; i < AMDGPU_MES_MAX_SDMA_PIPES; i++) {
 		if (adev->ip_versions[SDMA0_HWIP][0] < IP_VERSION(6, 0, 0))
 			adev->mes.sdma_hqd_mask[i] = i ? 0 : 0x3fc;
+		/* zero sdma_hqd_mask for non-existent engine */
+		else if (adev->sdma.num_instances == 1)
+			adev->mes.sdma_hqd_mask[i] = i ? 0 : 0xfc;
 		else
 			adev->mes.sdma_hqd_mask[i] = 0xfc;
 	}
-- 
2.35.1