linux-kernel - [PATCH AUTOSEL 6.2 02/37] drm/amd/display: populate subvp cmd info only for the top pipe

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Message-Id: <20230501025945.3253774-2-sashal@kernel.org>
Date:   Sun, 30 Apr 2023 22:59:10 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ayush Gupta <ayush.gupta@....com>, Alvin Lee <Alvin.Lee2@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, harry.wentland@....com,
        sunpeng.li@....com, Rodrigo.Siqueira@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, Jun.Lei@....com, Max.Tseng@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.2 02/37] drm/amd/display: populate subvp cmd info only for the top pipe

From: Ayush Gupta <ayush.gupta@....com>

[ Upstream commit 9bb10b7aaec3b6278f9cc410c17dcaa129bbbbf0 ]

[Why]
System restart observed while changing the display resolution
to 8k with extended mode. Sytem restart was caused by a page fault.

[How]
When the driver populates subvp info it did it for both the pipes using
vblank which caused an outof bounds array access causing the page fault.
added checks to allow the top pipe only to fix this issue.

Co-authored-by: Ayush Gupta <ayush.gupta@....com>
Reviewed-by: Alvin Lee <Alvin.Lee2@....com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@....com>
Signed-off-by: Ayush Gupta <ayush.gupta@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index 6ccf477d1c4dc..1141c50fa2b1c 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -750,7 +750,8 @@ void dc_dmub_setup_subvp_dmub_command(struct dc *dc,
 					!pipe->top_pipe && !pipe->prev_odm_pipe &&
 					pipe->stream->mall_stream_config.type == SUBVP_MAIN) {
 				populate_subvp_cmd_pipe_info(dc, context, &cmd, pipe, cmd_pipe_index++);
-			} else if (pipe->plane_state && pipe->stream->mall_stream_config.type == SUBVP_NONE) {
+			} else if (pipe->plane_state && pipe->stream->mall_stream_config.type == SUBVP_NONE &&
+				    !pipe->top_pipe && !pipe->prev_odm_pipe) {
 				// Don't need to check for ActiveDRAMClockChangeMargin < 0, not valid in cases where
 				// we run through DML without calculating "natural" P-state support
 				populate_subvp_cmd_vblank_pipe_info(dc, context, &cmd, pipe, cmd_pipe_index++);
-- 
2.39.2