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From: Harry Wentland <harry.wentland@amd.com>
To: Samuel Holland <samuel.holland@sifive.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-arm-kernel@lists.infradead.org, x86@kernel.org
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
	Christoph Hellwig <hch@lst.de>,
	loongarch@lists.linux.dev, amd-gfx@lists.freedesktop.org,
	Michael Ellerman <mpe@ellerman.id.au>,
	Alex Deucher <alexander.deucher@amd.com>
Subject: Re: [PATCH v4 12/15] drm/amd/display: Only use hard-float, not altivec on powerpc
Date: Tue, 30 Apr 2024 13:28:37 -0400	[thread overview]
Message-ID: <c2fd505a-1d4e-411a-80d4-c088843313d6@amd.com> (raw)
In-Reply-To: <20240329072441.591471-13-samuel.holland@sifive.com>

On 2024-03-29 03:18, Samuel Holland wrote:
> From: Michael Ellerman <mpe@ellerman.id.au>
> 
> The compiler flags enable altivec, but that is not required; hard-float
> is sufficient for the code to build and function.
> 
> Drop altivec from the compiler flags and adjust the enable/disable code
> to only enable FPU use.
> 
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
> Acked-by: Alex Deucher <alexander.deucher@amd.com>
> Signed-off-by: Samuel Holland <samuel.holland@sifive.com>

Acked-by: Harry Wentland <harry.wentland@amd.com>

Harry

> ---
> 
> (no changes since v2)
> 
> Changes in v2:
>  - New patch for v2
> 
>  drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 12 ++----------
>  drivers/gpu/drm/amd/display/dc/dml/Makefile    |  2 +-
>  drivers/gpu/drm/amd/display/dc/dml2/Makefile   |  2 +-
>  3 files changed, 4 insertions(+), 12 deletions(-)
> 
> 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 4ae4720535a5..0de16796466b 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
> @@ -92,11 +92,7 @@ void dc_fpu_begin(const char *function_name, const int line)
>  #if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
>  		kernel_fpu_begin();
>  #elif defined(CONFIG_PPC64)
> -		if (cpu_has_feature(CPU_FTR_VSX_COMP))
> -			enable_kernel_vsx();
> -		else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
> -			enable_kernel_altivec();
> -		else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
> +		if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
>  			enable_kernel_fp();
>  #elif defined(CONFIG_ARM64)
>  		kernel_neon_begin();
> @@ -125,11 +121,7 @@ void dc_fpu_end(const char *function_name, const int line)
>  #if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
>  		kernel_fpu_end();
>  #elif defined(CONFIG_PPC64)
> -		if (cpu_has_feature(CPU_FTR_VSX_COMP))
> -			disable_kernel_vsx();
> -		else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
> -			disable_kernel_altivec();
> -		else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
> +		if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
>  			disable_kernel_fp();
>  #elif defined(CONFIG_ARM64)
>  		kernel_neon_end();
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> index c4a5efd2dda5..59d3972341d2 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> @@ -31,7 +31,7 @@ dml_ccflags := $(dml_ccflags-y) -msse
>  endif
>  
>  ifdef CONFIG_PPC64
> -dml_ccflags := -mhard-float -maltivec
> +dml_ccflags := -mhard-float
>  endif
>  
>  ifdef CONFIG_ARM64
> diff --git a/drivers/gpu/drm/amd/display/dc/dml2/Makefile b/drivers/gpu/drm/amd/display/dc/dml2/Makefile
> index acff3449b8d7..7b51364084b5 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml2/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dml2/Makefile
> @@ -30,7 +30,7 @@ dml2_ccflags := $(dml2_ccflags-y) -msse
>  endif
>  
>  ifdef CONFIG_PPC64
> -dml2_ccflags := -mhard-float -maltivec
> +dml2_ccflags := -mhard-float
>  endif
>  
>  ifdef CONFIG_ARM64


  reply	other threads:[~2024-04-30 17:28 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-29  7:18 [PATCH v4 00/15] Unified cross-architecture kernel-mode FPU API Samuel Holland
2024-03-29  7:18 ` [PATCH v4 01/15] arch: Add ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-29  7:18 ` [PATCH v4 02/15] ARM: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-29  7:18 ` [PATCH v4 03/15] ARM: crypto: Use CC_FLAGS_FPU for NEON CFLAGS Samuel Holland
2024-03-29  7:18 ` [PATCH v4 04/15] arm64: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-29  7:18 ` [PATCH v4 05/15] arm64: crypto: Use CC_FLAGS_FPU for NEON CFLAGS Samuel Holland
2024-03-29  7:18 ` [PATCH v4 06/15] lib/raid6: " Samuel Holland
2024-03-29  7:18 ` [PATCH v4 07/15] LoongArch: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-29  7:18 ` [PATCH v4 08/15] powerpc: " Samuel Holland
2024-03-29  7:18 ` [PATCH v4 09/15] x86/fpu: Fix asm/fpu/types.h include guard Samuel Holland
2024-03-29 17:30   ` Dave Hansen
2024-03-29  7:18 ` [PATCH v4 10/15] x86: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-03-29 17:28   ` Dave Hansen
2024-03-29 18:02     ` Samuel Holland
2024-03-29  7:18 ` [PATCH v4 11/15] riscv: Add support for kernel-mode FPU Samuel Holland
2024-03-29  7:18 ` [PATCH v4 12/15] drm/amd/display: Only use hard-float, not altivec on powerpc Samuel Holland
2024-04-30 17:28   ` Harry Wentland [this message]
2024-03-29  7:18 ` [PATCH v4 13/15] drm/amd/display: Use ARCH_HAS_KERNEL_FPU_SUPPORT Samuel Holland
2024-04-10 22:21   ` Thiago Jung Bauermann
2024-04-10 22:47     ` Samuel Holland
2024-04-11  1:02       ` Thiago Jung Bauermann
2024-04-11  1:11         ` Samuel Holland
2024-04-11  1:27           ` Thiago Jung Bauermann
2024-04-11  7:15           ` Ard Biesheuvel
2024-04-11  7:31             ` Arnd Bergmann
2024-04-12  1:54               ` Dave Airlie
2024-04-30 17:29   ` Harry Wentland
2024-05-24  4:50   ` Guenter Roeck
2024-05-24 13:17     ` Alex Deucher
2024-05-24 13:18       ` Alex Deucher
2024-05-24 13:43         ` Guenter Roeck
2024-05-24 13:53           ` Guenter Roeck
2024-05-24 18:23         ` Guenter Roeck
2024-03-29  7:18 ` [PATCH v4 14/15] selftests/fpu: Move FP code to a separate translation unit Samuel Holland
2024-03-29  7:18 ` [PATCH v4 15/15] selftests/fpu: Allow building on other architectures Samuel Holland
2024-04-03 12:51 ` [PATCH v4 00/15] Unified cross-architecture kernel-mode FPU API Christian König

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