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drm/amd/display: Call FP Protect Before Mode Programming/Mode Support

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[ Upstream commit eba692ca3abca258b3214a6e4126afefad1822f0 ]

[Why]
Memory allocation occurs within dml21_validate() for adding phantom planes.
May cause kernel to be tainted due to usage of FP Start.

[How]
Move FP start from dml21_validate to before mode programming/mode support.
Calculations requiring floating point are all done within mode programming
or mode support.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Austin Zheng <Austin.Zheng@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit fe3250f10819b411808ab9ae1d824c5fc9b59170)
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Austin Zheng
2025-04-17 10:24:29 -04:00
committed by Greg Kroah-Hartman
parent 211f589206
commit a0c50c9f9c
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_wrapper.c
View File

@@ -221,7 +221,9 @@ static bool dml21_mode_check_and_programming(const struct dc *in_dc, struct dc_s
if (!result)
return false;
DC_FP_START();
result = dml2_build_mode_programming(mode_programming);
DC_FP_END();
if (!result)
return false;
@@ -271,7 +273,9 @@ static bool dml21_check_mode_support(const struct dc *in_dc, struct dc_state *co
mode_support->dml2_instance = dml_init->dml2_instance;
dml21_map_dc_state_into_dml_display_cfg(in_dc, context, dml_ctx);
dml_ctx->v21.mode_programming.dml2_instance->scratch.build_mode_programming_locals.mode_programming_params.programming = dml_ctx->v21.mode_programming.programming;
DC_FP_START();
is_supported = dml2_check_mode_supported(mode_support);
DC_FP_END();
if (!is_supported)
return false;
@@ -282,16 +286,12 @@ bool dml21_validate(const struct dc *in_dc, struct dc_state *context, struct dml
{
bool out = false;
DC_FP_START();
/* Use dml_validate_only for fast_validate path */
if (fast_validate)
out = dml21_check_mode_support(in_dc, context, dml_ctx);
else
out = dml21_mode_check_and_programming(in_dc, context, dml_ctx);
DC_FP_END();
return out;
}