Re: [PATCH] drm/amd/pm: Avoid more large frame warnings

["Lazar, Lijo" <lijo.lazar@amd.com>]

On 6/11/2025 10:30 AM, Lazar, Lijo wrote:
> 
> 
> On 6/11/2025 2:51 AM, Palmer Dabbelt wrote:
>> From: Palmer Dabbelt <palmer@dabbelt.com>
>>
>> 9KiB frames seem pretty big, but without this I'm getting some warnings
>> as of 6.16-rc1
>>
>>       CC [M]  drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_6_ppt.o
>>     drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_6_ppt.c: In function 'smu_v13_0_6_get_gpu_metrics':
>>     drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_6_ppt.c:2885:1: error: the frame size of 8304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>>      2885 | }
>>           | ^
>>     cc1: all warnings being treated as errors
>>
> 
> Could you also provide your build environment details?
> 
> With below in Makefile + gcc 11.4.0, stack frame size is 168 bytes.
> 
> ccflags-y += -fstack-usage
> 
> smu_v13_0_6_ppt.c:2667:16:smu_v13_0_6_get_gpu_metrics   168     static
> 
> Thanks,
> Lijo
> 

Was able to see this issue in one of our systems. This patch fixed that
-  https://patchwork.freedesktop.org/patch/658216/

Please try and let me know if it works for your config.

Thanks,
Lijo

>> Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
>> ---
>>  drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile b/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile
>> index 51f1fa9789ab..9824b7f4827f 100644
>> --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile
>> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/Makefile
>> @@ -23,9 +23,19 @@
>>  # Makefile for the 'smu manager' sub-component of powerplay.
>>  # It provides the smu management services for the driver.
>>  
>> +ifneq ($(CONFIG_FRAME_WARN),0)
>> +    frame_warn_limit := 9216
>> +    ifeq ($(call test-lt, $(CONFIG_FRAME_WARN), $(frame_warn_limit)),y)
>> +        frame_warn_flag := -Wframe-larger-than=$(frame_warn_limit)
>> +    endif
>> +endif
>> +
>>  SMU13_MGR = smu_v13_0.o aldebaran_ppt.o yellow_carp_ppt.o smu_v13_0_0_ppt.o smu_v13_0_4_ppt.o \
>>  	    smu_v13_0_5_ppt.o smu_v13_0_7_ppt.o smu_v13_0_6_ppt.o smu_v13_0_12_ppt.o
>>  
>>  AMD_SWSMU_SMU13MGR = $(addprefix $(AMD_SWSMU_PATH)/smu13/,$(SMU13_MGR))
>>  
>>  AMD_POWERPLAY_FILES += $(AMD_SWSMU_SMU13MGR)
>> +
>> +CFLAGS_$(AMD_SWSMU_PATH)/smu13/smu_v13_0_12_ppt.o := $(frame_warn_flag)
>> +CFLAGS_$(AMD_SWSMU_PATH)/smu13/smu_v13_0_6_ppt.o := $(frame_warn_flag)
>