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drm/amd/display: Permit DC_FP_START/END only in non-FP compilation units

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[WHAT]
Test the existing CPP macro _LINUX_FPU_COMPILATION_UNIT, which is set
when building source files that are permitted to use floating point,
in the implementation of DC_FP_START/END so that those are only usable
in non-FP code. This is a requirement of the generic kernel mode FPU
API, as some architectures (i.e., arm64) cannot safely enable FP codegen
in arbitrary code.

Cc: Austin Zheng <austin.zheng@amd.com>
Cc: Jun Lei <jun.lei@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Rodrigo Siqueira <siqueira@igalia.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org

Suggested-by: Christian König <christian.koenig@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ard Biesheuvel 2025-10-09 17:06:21 +02:00 committed by Alex Deucher
parent 03fc40766d
commit a574f53ed5
2 changed files with 8 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.h
View File

@ -31,4 +31,12 @@ void dc_assert_fp_enabled(void);
void dc_fpu_begin(const char *function_name, const int line);
void dc_fpu_end(const char *function_name, const int line);
#ifndef _LINUX_FPU_COMPILATION_UNIT
#define DC_FP_START() dc_fpu_begin(__func__, __LINE__)
#define DC_FP_END() dc_fpu_end(__func__, __LINE__)
#else
#define DC_FP_START() BUILD_BUG()
#define DC_FP_END() BUILD_BUG()
#endif
#endif /* __DC_FPU_H__ */

2
drivers/gpu/drm/amd/display/dc/os_types.h
View File

@ -55,8 +55,6 @@
#if defined(CONFIG_DRM_AMD_DC_FP)
#include "amdgpu_dm/dc_fpu.h"
#define DC_FP_START() dc_fpu_begin(__func__, __LINE__)
#define DC_FP_END() dc_fpu_end(__func__, __LINE__)
#endif /* CONFIG_DRM_AMD_DC_FP */
/*