Re: [PATCH v3 1/1] drm/amd/display: add DCN support for ARM64

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Hi Ao,

On Thu, Oct 27, 2022 at 09:52:29PM +0200, Ao Zhong wrote:
> After moving all FPU code to the DML folder, we can enable DCN support
> for the ARM64 platform. Remove the -mgeneral-regs-only CFLAG from the
> code in the DML folder that needs to use hardware FPU, and add a control
> mechanism for ARM Neon.
> 
> Signed-off-by: Ao Zhong <hacc1225@xxxxxxxxx>
> ---
>  drivers/gpu/drm/amd/display/Kconfig           |  2 +-
>  .../gpu/drm/amd/display/amdgpu_dm/dc_fpu.c    |  6 ++++++
>  drivers/gpu/drm/amd/display/dc/dml/Makefile   | 20 +++++++++++++++----
>  3 files changed, 23 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig
> index 0142affcdaa3..a7f1c4e51719 100644
> --- a/drivers/gpu/drm/amd/display/Kconfig
> +++ b/drivers/gpu/drm/amd/display/Kconfig
> @@ -6,7 +6,7 @@ config DRM_AMD_DC
>  	bool "AMD DC - Enable new display engine"
>  	default y
>  	select SND_HDA_COMPONENT if SND_HDA_CORE
> -	select DRM_AMD_DC_DCN if (X86 || PPC64)
> +	select DRM_AMD_DC_DCN if (X86 || PPC64 || (ARM64 && KERNEL_MODE_NEON))
>  	help
>  	  Choose this option if you want to use the new display engine
>  	  support for AMDGPU. This adds required support for Vega and
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
> index ab0c6d191038..1743ca0a3641 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
> @@ -31,6 +31,8 @@
>  #elif defined(CONFIG_PPC64)
>  #include <asm/switch_to.h>
>  #include <asm/cputable.h>
> +#elif defined(CONFIG_ARM64)
> +#include <asm/neon.h>
>  #endif
>  
>  /**
> @@ -99,6 +101,8 @@ void dc_fpu_begin(const char *function_name, const int line)
>  			preempt_disable();
>  			enable_kernel_fp();
>  		}
> +#elif defined(CONFIG_ARM64)
> +		kernel_neon_begin();
>  #endif
>  	}
>  
> @@ -136,6 +140,8 @@ void dc_fpu_end(const char *function_name, const int line)
>  			disable_kernel_fp();
>  			preempt_enable();
>  		}
> +#elif defined(CONFIG_ARM64)
> +		kernel_neon_end();
>  #endif
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> index d0c6cf61c676..d4e93bed1c8e 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> @@ -33,6 +33,10 @@ ifdef CONFIG_PPC64
>  dml_ccflags := -mhard-float -maltivec
>  endif
>  
> +ifdef CONFIG_ARM64
> +dml_rcflags := -mgeneral-regs-only
> +endif
> +
>  ifdef CONFIG_CC_IS_GCC
>  ifeq ($(call cc-ifversion, -lt, 0701, y), y)
>  IS_OLD_GCC = 1
> @@ -55,8 +59,6 @@ frame_warn_flag := -Wframe-larger-than=2048
>  endif
>  
>  CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_ccflags)
> -
> -ifdef CONFIG_DRM_AMD_DC_DCN
>  CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_vba.o := $(dml_ccflags)
>  CFLAGS_$(AMDDALPATH)/dc/dml/dcn10/dcn10_fpu.o := $(dml_ccflags)
>  CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/dcn20_fpu.o := $(dml_ccflags)
> @@ -88,7 +90,6 @@ CFLAGS_$(AMDDALPATH)/dc/dml/calcs/dcn_calcs.o := $(dml_ccflags)
>  CFLAGS_$(AMDDALPATH)/dc/dml/calcs/dcn_calc_auto.o := $(dml_ccflags)
>  CFLAGS_$(AMDDALPATH)/dc/dml/calcs/dcn_calc_math.o := $(dml_ccflags) -Wno-tautological-compare
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/display_mode_vba.o := $(dml_rcflags)
> -CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn2x/dcn2x.o := $(dml_rcflags)
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20.o := $(dml_rcflags)
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20.o := $(dml_rcflags)
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20v2.o := $(dml_rcflags)
> @@ -105,7 +106,18 @@ CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn32/display_mode_vba_util_32.o := $(dml_rcf
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn301/dcn301_fpu.o := $(dml_rcflags)
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_rcflags)
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dsc/rc_calc_fpu.o  := $(dml_rcflags)
> -endif
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn10/dcn10_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn20/dcn20_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn314/display_mode_vba_314.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn314/display_rq_dlg_calc_314.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn314/dcn314_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn30/dcn30_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn32/dcn32_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn321/dcn321_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn31/dcn31_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn302/dcn302_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn303/dcn303_fpu.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/calcs/dcn_calc_math.o := $(dml_rcflags)
>  CFLAGS_$(AMDDALPATH)/dc/dml/dml1_display_rq_dlg_calc.o := $(dml_ccflags)
>  CFLAGS_$(AMDDALPATH)/dc/dml/display_rq_dlg_helpers.o := $(dml_ccflags)
>  CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dml1_display_rq_dlg_calc.o := $(dml_rcflags)
> -- 
> 2.37.4
> 

Enabling this code for arm64 reveals the following warnings when
building allmodconfig with clang. A very recent change in LLVM added the
variable and spill information so that will not be seen with older
versions but I also saw the warnings with clang 15.0.0 from Fedora.

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:1852:13: error: stack frame size (2112) exceeds limit (2048) in 'DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation' [-Werror,-Wframe-larger-than]
  static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation(
              ^
  1152/2112 (54.55%) spills, 960/2112 (45.45%) variables

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:3542:6: error: stack frame size (2240) exceeds limit (2048) in 'dml30_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
  void dml30_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
      ^
  1451/2240 (64.78%) spills, 789/2240 (35.22%) variables

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c:3791:6: error: stack frame size (2736) exceeds limit (2048) in 'dml31_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
  void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
      ^
  1342/2736 (49.05%) spills, 1394/2736 (50.95%) variables

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn314/display_mode_vba_314.c:3890:6: error: stack frame size (2720) exceeds limit (2048) in 'dml314_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
  void dml314_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
      ^
  1325/2720 (48.71%) spills, 1395/2720 (51.29%) variables

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:59:13: error: stack frame size (2208) exceeds limit (2048) in 'DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation' [-Werror,-Wframe-larger-than]
  static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation(
              ^
  1397/2208 (63.27%) spills, 811/2208 (36.73%) variables

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:1681:6: error: stack frame size (2496) exceeds limit (2048) in 'dml32_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
  void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
      ^
  1504/2496 (60.26%) spills, 992/2496 (39.74%) variables

I can try to take a look at these next week, as I have prior obligations
today, unless others wanted to help me out ;)

Additionally, I see the following errors with GCC 12.2.1 from Fedora
when building allmodconfig. Seems like some $(dml_rcflags) might be
missing.

  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c: In function ‘dcn10_resource_construct_fp’:
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1313:52: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1313 |                 dcn_soc->dram_clock_change_latency = 23;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1317:45: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1317 |                 dc->dcn_soc->urgent_latency = 3;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1319:64: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1319 |                 dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 41.60f;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1329:64: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1329 |                 dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 19.2f;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1330:64: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1330 |                 dc->dcn_soc->fabric_and_dram_bandwidth_vnom0p8 = 17.066f;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1331:65: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1331 |                 dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 = 14.933f;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1332:65: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1332 |                 dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 = 12.8f;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:1334:72: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1334 |                         dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 20.80f;
        |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
  make[6]: *** [scripts/Makefile.build:250: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.o] Error 1
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_resource.c: In function ‘dcn32_populate_dml_pipes_from_context’:
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_resource.c:1921:70: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1921 |                 pipes[pipe_cnt].pipe.src.dcc_fraction_of_zs_req_luma = 0;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
  drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_resource.c:1922:72: error: ‘-mgeneral-regs-only’ is incompatible with the use of floating-point types
  1922 |                 pipes[pipe_cnt].pipe.src.dcc_fraction_of_zs_req_chroma = 0;
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
  make[6]: *** [scripts/Makefile.build:250: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_resource.o] Error 1

Cheers,
Nathan



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