[PATCH 5.10 04/43] drm/amdgpu/display: drop DCN support for aarch64

Greg Kroah-Hartman
2021-01-22T14:58:59Z

From: Alex Deucher <alexander.deucher@amd.com>

commit c241ed2f0ea549c18cff62a3708b43846b84dae3 upstream.

>From Ard:

"Simply disabling -mgeneral-regs-only left and right is risky, given that
the standard AArch64 ABI permits the use of FP/SIMD registers anywhere,
and GCC is known to use SIMD registers for spilling, and may invent
other uses of the FP/SIMD register file that have nothing to do with the
floating point code in question. Note that putting kernel_neon_begin()
and kernel_neon_end() around the code that does use FP is not sufficient
here, the problem is in all the other code that may be emitted with
references to SIMD registers in it.

So the only way to do this properly is to put all floating point code in
a separate compilation unit, and only compile that unit with
-mgeneral-regs-only."

Disable support until the code can be properly refactored to support this
properly on aarch64.

Acked-by: Will Deacon <will@kernel.org>
Reported-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[ardb: backport to v5.10 by reverting c38d444e44badc55 instead]
Acked-by: Alex Deucher <alexander.deucher@amd.com> # v5.10 backport
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/display/Kconfig | 2
drivers/gpu/drm/amd/display/dc/calcs/Makefile | 7 -
drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile | 7 -
drivers/gpu/drm/amd/display/dc/dcn10/Makefile | 7 -
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c | 81 ++++++------------
drivers/gpu/drm/amd/display/dc/dcn20/Makefile | 4
drivers/gpu/drm/amd/display/dc/dcn21/Makefile | 4
drivers/gpu/drm/amd/display/dc/dml/Makefile | 13 --
drivers/gpu/drm/amd/display/dc/dsc/Makefile | 5 -
drivers/gpu/drm/amd/display/dc/os_types.h | 4
10 files changed, 32 insertions(+), 102 deletions(-)

--- 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 || (ARM64 && KERNEL_MODE_NEON)) && !(KCOV_INSTRUMENT_ALL && KCOV_ENABLE_COMPARISONS)
+ select DRM_AMD_DC_DCN if (X86 || PPC64) && !(KCOV_INSTRUMENT_ALL && KCOV_ENABLE_COMPARISONS)
help
Choose this option if you want to use the new display engine
support for AMDGPU. This adds required support for Vega and
--- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
@@ -33,10 +33,6 @@ ifdef CONFIG_PPC64
calcs_ccflags := -mhard-float -maltivec
endif

-ifdef CONFIG_ARM64
-calcs_rcflags := -mgeneral-regs-only
-endif
-
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-ifversion, -lt, 0701, y), y)
IS_OLD_GCC = 1
@@ -57,9 +53,6 @@ endif
CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calcs.o := $(calcs_ccflags)
CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_auto.o := $(calcs_ccflags)
CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/calcs/dcn_calcs.o := $(calcs_rcflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/calcs/dcn_calc_auto.o := $(calcs_rcflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/calcs/dcn_calc_math.o := $(calcs_rcflags)

BW_CALCS = dce_calcs.o bw_fixed.o custom_float.o

--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
@@ -104,13 +104,6 @@ ifdef CONFIG_PPC64
CFLAGS_$(AMDDALPATH)/dc/clk_mgr/dcn21/rn_clk_mgr.o := $(call cc-option,-mno-gnu-attribute)
endif

-# prevent build errors:
-# ...: '-mgeneral-regs-only' is incompatible with the use of floating-point types
-# this file is unused on arm64, just like on ppc64
-ifdef CONFIG_ARM64
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/clk_mgr/dcn21/rn_clk_mgr.o := -mgeneral-regs-only
-endif
-
AMD_DAL_CLK_MGR_DCN21 = $(addprefix $(AMDDALPATH)/dc/clk_mgr/dcn21/,$(CLK_MGR_DCN21))

AMD_DISPLAY_FILES += $(AMD_DAL_CLK_MGR_DCN21)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/Makefile
@@ -31,11 +31,4 @@ DCN10 = dcn10_init.o dcn10_resource.o dc

AMD_DAL_DCN10 = $(addprefix $(AMDDALPATH)/dc/dcn10/,$(DCN10))

-# fix:
-# ...: '-mgeneral-regs-only' is incompatible with the use of floating-point types
-# aarch64 does not support soft-float, so use hard-float and handle this in code
-ifdef CONFIG_ARM64
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dcn10/dcn10_resource.o := -mgeneral-regs-only
-endif
-
AMD_DISPLAY_FILES += $(AMD_DAL_DCN10)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
@@ -1339,47 +1339,6 @@ static uint32_t read_pipe_fuses(struct d
return value;
}

-/*
- * Some architectures don't support soft-float (e.g. aarch64), on those
- * this function has to be called with hardfloat enabled, make sure not
- * to inline it so whatever fp stuff is done stays inside
- */
-static noinline void dcn10_resource_construct_fp(
- struct dc *dc)
-{
- if (dc->ctx->dce_version == DCN_VERSION_1_01) {
- struct dcn_soc_bounding_box *dcn_soc = dc->dcn_soc;
- struct dcn_ip_params *dcn_ip = dc->dcn_ip;
- struct display_mode_lib *dml = &dc->dml;
-
- dml->ip.max_num_dpp = 3;
- /* TODO how to handle 23.84? */
- dcn_soc->dram_clock_change_latency = 23;
- dcn_ip->max_num_dpp = 3;
- }
- if (ASICREV_IS_RV1_F0(dc->ctx->asic_id.hw_internal_rev)) {
- dc->dcn_soc->urgent_latency = 3;
- dc->debug.disable_dmcu = true;
- dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 41.60f;
- }
-
-
- dc->dcn_soc->number_of_channels = dc->ctx->asic_id.vram_width / ddr4_dram_width;
- ASSERT(dc->dcn_soc->number_of_channels < 3);
- if (dc->dcn_soc->number_of_channels == 0)/*old sbios bug*/
- dc->dcn_soc->number_of_channels = 2;
-
- if (dc->dcn_soc->number_of_channels == 1) {
- dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 19.2f;
- dc->dcn_soc->fabric_and_dram_bandwidth_vnom0p8 = 17.066f;
- dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 = 14.933f;
- dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 = 12.8f;
- if (ASICREV_IS_RV1_F0(dc->ctx->asic_id.hw_internal_rev)) {
- dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 20.80f;
- }
- }
-}
-
static bool dcn10_resource_construct(
uint8_t num_virtual_links,
struct dc *dc,
@@ -1531,15 +1490,37 @@ static bool dcn10_resource_construct(
memcpy(dc->dcn_ip, &dcn10_ip_defaults, sizeof(dcn10_ip_defaults));
memcpy(dc->dcn_soc, &dcn10_soc_defaults, sizeof(dcn10_soc_defaults));

-#if defined(CONFIG_ARM64)
- /* Aarch64 does not support -msoft-float/-mfloat-abi=soft */
- DC_FP_START();
- dcn10_resource_construct_fp(dc);
- DC_FP_END();
-#else
- /* Other architectures we build for build this with soft-float */
- dcn10_resource_construct_fp(dc);
-#endif
+ if (dc->ctx->dce_version == DCN_VERSION_1_01) {
+ struct dcn_soc_bounding_box *dcn_soc = dc->dcn_soc;
+ struct dcn_ip_params *dcn_ip = dc->dcn_ip;
+ struct display_mode_lib *dml = &dc->dml;
+
+ dml->ip.max_num_dpp = 3;
+ /* TODO how to handle 23.84? */
+ dcn_soc->dram_clock_change_latency = 23;
+ dcn_ip->max_num_dpp = 3;
+ }
+ if (ASICREV_IS_RV1_F0(dc->ctx->asic_id.hw_internal_rev)) {
+ dc->dcn_soc->urgent_latency = 3;
+ dc->debug.disable_dmcu = true;
+ dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 41.60f;
+ }
+
+
+ dc->dcn_soc->number_of_channels = dc->ctx->asic_id.vram_width / ddr4_dram_width;
+ ASSERT(dc->dcn_soc->number_of_channels < 3);
+ if (dc->dcn_soc->number_of_channels == 0)/*old sbios bug*/
+ dc->dcn_soc->number_of_channels = 2;
+
+ if (dc->dcn_soc->number_of_channels == 1) {
+ dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 19.2f;
+ dc->dcn_soc->fabric_and_dram_bandwidth_vnom0p8 = 17.066f;
+ dc->dcn_soc->fabric_and_dram_bandwidth_vmid0p72 = 14.933f;
+ dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 = 12.8f;
+ if (ASICREV_IS_RV1_F0(dc->ctx->asic_id.hw_internal_rev)) {
+ dc->dcn_soc->fabric_and_dram_bandwidth_vmax0p9 = 20.80f;
+ }
+ }

pool->base.pp_smu = dcn10_pp_smu_create(ctx);

--- a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
@@ -17,10 +17,6 @@ ifdef CONFIG_PPC64
CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -maltivec
endif

-ifdef CONFIG_ARM64
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mgeneral-regs-only
-endif
-
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-ifversion, -lt, 0701, y), y)
IS_OLD_GCC = 1
--- a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
@@ -13,10 +13,6 @@ ifdef CONFIG_PPC64
CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -maltivec
endif

-ifdef CONFIG_ARM64
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mgeneral-regs-only
-endif
-
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-ifversion, -lt, 0701, y), y)
IS_OLD_GCC = 1
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -33,10 +33,6 @@ ifdef CONFIG_PPC64
dml_ccflags := -mhard-float -maltivec
endif

-ifdef CONFIG_ARM64
-dml_rcflags := -mgeneral-regs-only
-endif
-
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-ifversion, -lt, 0701, y), y)
IS_OLD_GCC = 1
@@ -64,13 +60,6 @@ CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/displa
CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20v2.o := $(dml_ccflags)
CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_mode_vba_21.o := $(dml_ccflags)
CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_rq_dlg_calc_21.o := $(dml_ccflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/display_mode_vba.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 := $(dml_rcflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20v2.o := $(dml_rcflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn21/display_mode_vba_21.o := $(dml_rcflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn21/display_rq_dlg_calc_21.o := $(dml_rcflags)
endif
ifdef CONFIG_DRM_AMD_DC_DCN3_0
CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_mode_vba_30.o := $(dml_ccflags) -Wframe-larger-than=2048
@@ -78,8 +67,6 @@ CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/displa
endif
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 := $(dml_rcflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/display_rq_dlg_helpers.o := $(dml_rcflags)

DML = display_mode_lib.o display_rq_dlg_helpers.o dml1_display_rq_dlg_calc.o \

--- a/drivers/gpu/drm/amd/display/dc/dsc/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dsc/Makefile
@@ -10,10 +10,6 @@ ifdef CONFIG_PPC64
dsc_ccflags := -mhard-float -maltivec
endif

-ifdef CONFIG_ARM64
-dsc_rcflags := -mgeneral-regs-only
-endif
-
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-ifversion, -lt, 0701, y), y)
IS_OLD_GCC = 1
@@ -32,7 +28,6 @@ endif
endif

CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc.o := $(dsc_ccflags)
-CFLAGS_REMOVE_$(AMDDALPATH)/dc/dsc/rc_calc.o := $(dsc_rcflags)

DSC = dc_dsc.o rc_calc.o rc_calc_dpi.o

--- a/drivers/gpu/drm/amd/display/dc/os_types.h
+++ b/drivers/gpu/drm/amd/display/dc/os_types.h
@@ -55,10 +55,6 @@
#include <asm/fpu/api.h>
#define DC_FP_START() kernel_fpu_begin()
#define DC_FP_END() kernel_fpu_end()
-#elif defined(CONFIG_ARM64)
-#include <asm/neon.h>
-#define DC_FP_START() kernel_neon_begin()
-#define DC_FP_END() kernel_neon_end()
#elif defined(CONFIG_PPC64)
#include <asm/switch_to.h>
#include <asm/cputable.h>