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drm/amd/display: use ARCH_HAS_KERNEL_FPU_SUPPORT

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Now that all previously-supported architectures select
ARCH_HAS_KERNEL_FPU_SUPPORT, this code can depend on that symbol instead
of the existing list of architectures.  It can also take advantage of the
common kernel-mode FPU API and method of adjusting CFLAGS.

Link: https://lkml.kernel.org/r/20240329072441.591471-14-samuel.holland@sifive.com
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian König <christian.koenig@amd.com> 
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: WANG Xuerui <git@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Samuel Holland 2024-03-29 00:18:28 -07:00 committed by Andrew Morton
parent 06a990b6e0
commit a28e4b672f
4 changed files with 7 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/display/Kconfig
View File

@ -8,7 +8,7 @@ config DRM_AMD_DC
depends on BROKEN || !CC_IS_CLANG || ARM64 || RISCV || SPARC64 || X86_64
select SND_HDA_COMPONENT if SND_HDA_CORE
# !CC_IS_CLANG: https://github.com/ClangBuiltLinux/linux/issues/1752
select DRM_AMD_DC_FP if (X86 || LOONGARCH || (PPC64 && ALTIVEC) || (ARM64 && KERNEL_MODE_NEON && !CC_IS_CLANG))
select DRM_AMD_DC_FP if ARCH_HAS_KERNEL_FPU_SUPPORT && (!ARM64 || !CC_IS_CLANG)
help
Choose this option if you want to use the new display engine
support for AMDGPU. This adds required support for Vega and

27
drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
View File

@ -26,16 +26,7 @@
#include "dc_trace.h"
#if defined(CONFIG_X86)
#include <asm/fpu/api.h>
#elif defined(CONFIG_PPC64)
#include <asm/switch_to.h>
#include <asm/cputable.h>
#elif defined(CONFIG_ARM64)
#include <asm/neon.h>
#elif defined(CONFIG_LOONGARCH)
#include <asm/fpu.h>
#endif
#include <linux/fpu.h>
/**
* DOC: DC FPU manipulation overview
@ -87,16 +78,9 @@ void dc_fpu_begin(const char *function_name, const int line)
WARN_ON_ONCE(!in_task());
preempt_disable();
depth = __this_cpu_inc_return(fpu_recursion_depth);
if (depth == 1) {
#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
BUG_ON(!kernel_fpu_available());
kernel_fpu_begin();
#elif defined(CONFIG_PPC64)
if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
enable_kernel_fp();
#elif defined(CONFIG_ARM64)
kernel_neon_begin();
#endif
}
TRACE_DCN_FPU(true, function_name, line, depth);
@ -118,14 +102,7 @@ void dc_fpu_end(const char *function_name, const int line)
depth = __this_cpu_dec_return(fpu_recursion_depth);
if (depth == 0) {
#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
kernel_fpu_end();
#elif defined(CONFIG_PPC64)
if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
disable_kernel_fp();
#elif defined(CONFIG_ARM64)
kernel_neon_end();
#endif
} else {
WARN_ON_ONCE(depth < 0);
}

36
drivers/gpu/drm/amd/display/dc/dml/Makefile
View File

@ -25,40 +25,8 @@
# It provides the general basic services required by other DAL
# subcomponents.
ifdef CONFIG_X86
dml_ccflags-$(CONFIG_CC_IS_GCC) := -mhard-float
dml_ccflags := $(dml_ccflags-y) -msse
endif
ifdef CONFIG_PPC64
dml_ccflags := -mhard-float
endif
ifdef CONFIG_ARM64
dml_rcflags := -mgeneral-regs-only
endif
ifdef CONFIG_LOONGARCH
dml_ccflags := -mfpu=64
dml_rcflags := -msoft-float
endif
ifdef CONFIG_CC_IS_GCC
ifneq ($(call gcc-min-version, 70100),y)
IS_OLD_GCC = 1
endif
endif
ifdef CONFIG_X86
ifdef IS_OLD_GCC
# Stack alignment mismatch, proceed with caution.
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
dml_ccflags += -mpreferred-stack-boundary=4
else
dml_ccflags += -msse2
endif
endif
dml_ccflags := $(CC_FLAGS_FPU)
dml_rcflags := $(CC_FLAGS_NO_FPU)
ifneq ($(CONFIG_FRAME_WARN),0)
ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)),y)

36
drivers/gpu/drm/amd/display/dc/dml2/Makefile
View File

@ -24,40 +24,8 @@
#
# Makefile for dml2.
ifdef CONFIG_X86
dml2_ccflags-$(CONFIG_CC_IS_GCC) := -mhard-float
dml2_ccflags := $(dml2_ccflags-y) -msse
endif
ifdef CONFIG_PPC64
dml2_ccflags := -mhard-float
endif
ifdef CONFIG_ARM64
dml2_rcflags := -mgeneral-regs-only
endif
ifdef CONFIG_LOONGARCH
dml2_ccflags := -mfpu=64
dml2_rcflags := -msoft-float
endif
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-ifversion, -lt, 0701, y), y)
IS_OLD_GCC = 1
endif
endif
ifdef CONFIG_X86
ifdef IS_OLD_GCC
# Stack alignment mismatch, proceed with caution.
# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
# (8B stack alignment).
dml2_ccflags += -mpreferred-stack-boundary=4
else
dml2_ccflags += -msse2
endif
endif
dml2_ccflags := $(CC_FLAGS_FPU)
dml2_rcflags := $(CC_FLAGS_NO_FPU)
ifneq ($(CONFIG_FRAME_WARN),0)
ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)),y)