[PATCH] drm/amdgpu/display: FP fixes for DCN3.x
Kazlauskas, Nicholas
nicholas.kazlauskas at amd.com
Tue Nov 3 17:17:37 UTC 2020
On 2020-11-02 5:28 p.m., Alex Deucher wrote:
> Add proper FP_START/END handling and adjust Makefiles per
> previous asics.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Regards,
Nicholas Kazlauskas
> ---
> .../gpu/drm/amd/display/dc/clk_mgr/Makefile | 13 ++++
> .../drm/amd/display/dc/dcn30/dcn30_resource.c | 71 +++++++++++++++++--
> drivers/gpu/drm/amd/display/dc/dml/Makefile | 6 +-
> 3 files changed, 84 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile b/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
> index facc8b970300..9f9137562cab 100644
> --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
> @@ -127,6 +127,19 @@ AMD_DISPLAY_FILES += $(AMD_DAL_CLK_MGR_DCN30)
> ###############################################################################
> CLK_MGR_DCN301 = vg_clk_mgr.o dcn301_smu.o
>
> +# prevent build errors regarding soft-float vs hard-float FP ABI tags
> +# this code is currently unused on ppc64, as it applies to VanGogh APUs only
> +ifdef CONFIG_PPC64
> +CFLAGS_$(AMDDALPATH)/dc/clk_mgr/dcn301/vg_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/dcn301/vg_clk_mgr.o := -mgeneral-regs-only
> +endif
> +
> AMD_DAL_CLK_MGR_DCN301 = $(addprefix $(AMDDALPATH)/dc/clk_mgr/dcn301/,$(CLK_MGR_DCN301))
>
> AMD_DISPLAY_FILES += $(AMD_DAL_CLK_MGR_DCN301)
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
> index d65496917e93..01ac8b2921c6 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
> @@ -1469,7 +1469,19 @@ int dcn30_populate_dml_pipes_from_context(
> return pipe_cnt;
> }
>
> -void dcn30_populate_dml_writeback_from_context(
> +/*
> + * This must be noinline to ensure anything that deals with FP registers
> + * is contained within this call; previously our compiling with hard-float
> + * would result in fp instructions being emitted outside of the boundaries
> + * of the DC_FP_START/END macros, which makes sense as the compiler has no
> + * idea about what is wrapped and what is not
> + *
> + * This is largely just a workaround to avoid breakage introduced with 5.6,
> + * ideally all fp-using code should be moved into its own file, only that
> + * should be compiled with hard-float, and all code exported from there
> + * should be strictly wrapped with DC_FP_START/END
> + */
> +static noinline void dcn30_populate_dml_writeback_from_context_fp(
> struct dc *dc, struct resource_context *res_ctx, display_e2e_pipe_params_st *pipes)
> {
> int pipe_cnt, i, j;
> @@ -1558,6 +1570,14 @@ void dcn30_populate_dml_writeback_from_context(
>
> }
>
> +void dcn30_populate_dml_writeback_from_context(
> + struct dc *dc, struct resource_context *res_ctx, display_e2e_pipe_params_st *pipes)
> +{
> + DC_FP_START();
> + dcn30_populate_dml_writeback_from_context_fp(dc, res_ctx, pipes);
> + DC_FP_END();
> +}
> +
> unsigned int dcn30_calc_max_scaled_time(
> unsigned int time_per_pixel,
> enum mmhubbub_wbif_mode mode,
> @@ -2204,7 +2224,19 @@ static bool dcn30_internal_validate_bw(
> return out;
> }
>
> -void dcn30_calculate_wm_and_dlg(
> +/*
> + * This must be noinline to ensure anything that deals with FP registers
> + * is contained within this call; previously our compiling with hard-float
> + * would result in fp instructions being emitted outside of the boundaries
> + * of the DC_FP_START/END macros, which makes sense as the compiler has no
> + * idea about what is wrapped and what is not
> + *
> + * This is largely just a workaround to avoid breakage introduced with 5.6,
> + * ideally all fp-using code should be moved into its own file, only that
> + * should be compiled with hard-float, and all code exported from there
> + * should be strictly wrapped with DC_FP_START/END
> + */
> +static noinline void dcn30_calculate_wm_and_dlg_fp(
> struct dc *dc, struct dc_state *context,
> display_e2e_pipe_params_st *pipes,
> int pipe_cnt,
> @@ -2360,7 +2392,18 @@ void dcn30_calculate_wm_and_dlg(
> dc->clk_mgr->bw_params->wm_table.nv_entries[WM_A].dml_input.pstate_latency_us;
> }
>
> -bool dcn30_validate_bandwidth(struct dc *dc,
> +void dcn30_calculate_wm_and_dlg(
> + struct dc *dc, struct dc_state *context,
> + display_e2e_pipe_params_st *pipes,
> + int pipe_cnt,
> + int vlevel)
> +{
> + DC_FP_START();
> + dcn30_calculate_wm_and_dlg_fp(dc, context, pipes, pipe_cnt, vlevel);
> + DC_FP_END();
> +}
> +
> +static noinline bool dcn30_validate_bandwidth_fp(struct dc *dc,
> struct dc_state *context,
> bool fast_validate)
> {
> @@ -2411,7 +2454,20 @@ bool dcn30_validate_bandwidth(struct dc *dc,
> return out;
> }
>
> -static void get_optimal_dcfclk_fclk_for_uclk(unsigned int uclk_mts,
> +bool dcn30_validate_bandwidth(struct dc *dc,
> + struct dc_state *context,
> + bool fast_validate)
> +{
> + bool out;
> +
> + DC_FP_START();
> + out = dcn30_validate_bandwidth_fp(dc, context, fast_validate);
> + DC_FP_END();
> +
> + return out;
> +}
> +
> +static noinline void get_optimal_dcfclk_fclk_for_uclk(unsigned int uclk_mts,
> unsigned int *optimal_dcfclk,
> unsigned int *optimal_fclk)
> {
> @@ -2478,8 +2534,10 @@ void dcn30_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params
>
> // Calculate optimal dcfclk for each uclk
> for (i = 0; i < num_uclk_states; i++) {
> + DC_FP_START();
> get_optimal_dcfclk_fclk_for_uclk(bw_params->clk_table.entries[i].memclk_mhz * 16,
> &optimal_dcfclk_for_uclk[i], NULL);
> + DC_FP_END();
> if (optimal_dcfclk_for_uclk[i] < bw_params->clk_table.entries[0].dcfclk_mhz) {
> optimal_dcfclk_for_uclk[i] = bw_params->clk_table.entries[0].dcfclk_mhz;
> }
> @@ -2583,6 +2641,8 @@ static bool dcn30_resource_construct(
> struct irq_service_init_data init_data;
> struct ddc_service_init_data ddc_init_data;
>
> + DC_FP_START();
> +
> ctx->dc_bios->regs = &bios_regs;
>
> pool->base.res_cap = &res_cap_dcn3;
> @@ -2860,10 +2920,13 @@ static bool dcn30_resource_construct(
> pool->base.oem_device = NULL;
> }
>
> + DC_FP_END();
> +
> return true;
>
> create_fail:
>
> + DC_FP_END();
> dcn30_resource_destruct(pool);
>
> return false;
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> index 879a930358a5..8866e1348b65 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
> @@ -64,6 +64,8 @@ CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20v2.o := $(dml_ccflags)
> CFLAGS_$(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 := $(dml_ccflags)
> +CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_mode_vba_30.o := $(dml_ccflags) -Wframe-larger-than=2048
> +CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_rq_dlg_calc_30.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 := $(dml_rcflags)
> @@ -71,8 +73,8 @@ CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20v2.o := $(dml_rcflag
> CFLAGS_REMOVE_$(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 := $(dml_rcflags)
> -CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_mode_vba_30.o := $(dml_ccflags) -Wframe-larger-than=2048
> -CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_rq_dlg_calc_30.o := $(dml_ccflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn30/display_mode_vba_30.o := $(dml_rcflags)
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/dcn30/display_rq_dlg_calc_30.o := $(dml_rcflags)
> endif
> CFLAGS_$(AMDDALPATH)/dc/dml/dml1_display_rq_dlg_calc.o := $(dml_ccflags)
> CFLAGS_$(AMDDALPATH)/dc/dml/display_rq_dlg_helpers.o := $(dml_ccflags)
>
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