Re: AMD DC graphics display code enables -mhard-float, -msse, -msse2 without any visible FPU state protection

[Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>]

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On 04/09, Peter Zijlstra wrote:
> On Thu, Apr 09, 2020 at 08:15:57PM +0200, Christian König wrote:
> > Am 09.04.20 um 19:09 schrieb Peter Zijlstra:
> > > On Thu, Apr 09, 2020 at 05:59:56PM +0200, Peter Zijlstra wrote:
> > > [SNIP]
> > > > I'll need another approach, let me consider.
> > > Christian; it says these files are generated, does that generator know
> > > which functions are wholly in FPU context and which are not?
> > 
> > Well that "generator" is still a human being :)
> > 
> > It's just that the formulae for the calculation come from the hardware team
> > and we are not able to easily transcript them to fixed point calculations.
> 
> Well, if it's a human, can this human respect the kernel coding style a
> bit more :-) Some of that stuff is atrocious.
> 
> > > My current thinking is that if I annotate all functions that are wholly
> > > inside kernel_fpu_start() with an __fpu function attribute, then I can
> > > verify that any call from regular text to fpu text only happens inside
> > > kernel_fpu_begin()/end(). And I can ensure that all !__fpu annotation
> > > fuctions only contain !fpu instructions.
> > 
> > Yeah, that sounds like a good idea to me and should be easily doable.
> > 
> > > Can that generator add the __fpu function attribute or is that something
> > > that would need to be done manually (which seems like it would be
> > > painful, since it is quite a bit of code) ?
> > 
> > We are currently in the process of moving all the stuff which requires
> > floating point into a single C file(s) and then make sure that we only call
> > those within kernel_fpu_begin()/end() blocks.
> 
> Can you make the build system stick all those .o files in a single
> archive? That's the only way I can do call validation; external
> relocatoin records do not contain the section.
> 
> > Annotating those function with __fpu or even saying to gcc that all code of
> > those files should go into a special text.fpu segment shouldn't be much of a
> > problem.
> 
> Guess what the __fpu attribute does ;-)
> 
> With the below patch (which is on to of newer versions of the objtool
> patches send earlier, let me know if you want a full set) that only
> converts a few files, but fully converts:
> 
>   drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c
> 
> But building it (and this is an absolute pain; when you're reworking
> this, can you pretty please also fix the Makefiles?), we get:

Hi,

I'm going to work on the FPU issues in the display code. In this sense,
could you clarify a little bit more about the Makefile issues?

Also, I applied the patch `[PATCH v4] x86: insn: Add insn_is_fpu()` and
tried to reproduce the warning that you described but I didn't see it.
Could you explain to me how I can check those warnings?

Thanks

>   drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.o: warning: objtool: dcn_validate_bandwidth()+0x34fa: FPU instruction outside of kernel_fpu_{begin,end}()
> 
> $ ./scripts/faddr2line defconfig-build/drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.o dcn_validate_bandwidth+0x34fa
> dcn_validate_bandwidth+0x34fa/0x57ce:
> dcn_validate_bandwidth at /usr/src/linux-2.6/defconfig-build/../drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:1293 (discriminator 5)
> 
> # ./objdump-func.sh defconfig-build/drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.o dcn_validate_bandwidth | grep 34fa
> 34fa     50fa:  f2 0f 10 b5 60 ff ff    movsd  -0xa0(%rbp),%xmm6
> 
> Which seems to indicate there's still problms with the current code.
> 
> 
> 
> ---
>  arch/x86/include/asm/fpu/api.h                     | 12 +++++++++++
>  arch/x86/kernel/vmlinux.lds.S                      |  1 +
>  .../gpu/drm/amd/display/dc/calcs/dcn_calc_math.c   | 25 +++++++++++-----------
>  drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c   |  4 ++--
>  .../display/dc/dml/dcn20/display_rq_dlg_calc_20.c  | 10 ++++-----
>  .../amd/display/dc/dml/display_rq_dlg_helpers.c    |  2 +-
>  .../gpu/drm/amd/display/dc/dml/dml_common_defs.c   |  2 +-
>  drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c        |  2 +-
>  drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c       | 10 ++++-----
>  drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c   |  4 ++--
>  drivers/gpu/drm/amd/display/dc/inc/dcn_calc_math.h |  2 ++
>  tools/objtool/check.c                              |  7 +++++-
>  tools/objtool/elf.h                                |  2 +-
>  13 files changed, 52 insertions(+), 31 deletions(-)
> 
> diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h
> index 64be4426fda9..19eaf98bbb0a 100644
> --- a/arch/x86/include/asm/fpu/api.h
> +++ b/arch/x86/include/asm/fpu/api.h
> @@ -12,11 +12,23 @@
>  #define _ASM_X86_FPU_API_H
>  #include <linux/bottom_half.h>
> 
> +#ifdef CONFIG_STACK_VALIDATION
> +
> +#define __fpu __section(".text.fpu")
> +
>  #define _ASM_ANNOTATE_FPU(at)						\
>  		     ".pushsection .discard.fpu_safe\n"			\
>  		     ".long " #at " - .\n"				\
>  		     ".popsection\n"					\
> 
> +#else
> +
> +#define __fpu
> +
> +#define _ASM_ANNOTATE_FPU(at)
> +
> +#endif /* CONFIG_STACK_VALIDATION */
> +
>  #define annotate_fpu() ({						\
>  	asm volatile("%c0:\n\t"						\
>  		     _ASM_ANNOTATE_FPU(%c0b)				\
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index 1bf7e312361f..8442f8633d07 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -139,6 +139,7 @@ SECTIONS
>  		SOFTIRQENTRY_TEXT
>  		*(.fixup)
>  		*(.gnu.warning)
> +		*(.text.fpu)
> 
>  #ifdef CONFIG_RETPOLINE
>  		__indirect_thunk_start = .;
> diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
> index 07d18e78de49..57ab3aafef5a 100644
> --- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
> +++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
> @@ -36,7 +36,7 @@
>   * remain as-is as it provides us with a guarantee from HW that it is correct.
>   */
> 
> -float dcn_bw_mod(const float arg1, const float arg2)
> +__fpu float dcn_bw_mod(const float arg1, const float arg2)
>  {
>  	if (isNaN(arg1))
>  		return arg2;
> @@ -45,7 +45,7 @@ float dcn_bw_mod(const float arg1, const float arg2)
>  	return arg1 - arg1 * ((int) (arg1 / arg2));
>  }
> 
> -float dcn_bw_min2(const float arg1, const float arg2)
> +__fpu float dcn_bw_min2(const float arg1, const float arg2)
>  {
>  	if (isNaN(arg1))
>  		return arg2;
> @@ -58,7 +58,7 @@ unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
>  {
>  	return arg1 > arg2 ? arg1 : arg2;
>  }
> -float dcn_bw_max2(const float arg1, const float arg2)
> +__fpu float dcn_bw_max2(const float arg1, const float arg2)
>  {
>  	if (isNaN(arg1))
>  		return arg2;
> @@ -67,25 +67,26 @@ float dcn_bw_max2(const float arg1, const float arg2)
>  	return arg1 > arg2 ? arg1 : arg2;
>  }
> 
> -float dcn_bw_floor2(const float arg, const float significance)
> +__fpu float dcn_bw_floor2(const float arg, const float significance)
>  {
>  	if (significance == 0)
>  		return 0;
>  	return ((int) (arg / significance)) * significance;
>  }
> -float dcn_bw_floor(const float arg)
> +
> +__fpu float dcn_bw_floor(const float arg)
>  {
>  	return ((int) (arg));
>  }
> 
> -float dcn_bw_ceil(const float arg)
> +__fpu float dcn_bw_ceil(const float arg)
>  {
>  	float flr = dcn_bw_floor2(arg, 1);
> 
>  	return flr + 0.00001 >= arg ? arg : flr + 1;
>  }
> 
> -float dcn_bw_ceil2(const float arg, const float significance)
> +__fpu float dcn_bw_ceil2(const float arg, const float significance)
>  {
>  	float flr = dcn_bw_floor2(arg, significance);
>  	if (significance == 0)
> @@ -93,17 +94,17 @@ float dcn_bw_ceil2(const float arg, const float significance)
>  	return flr + 0.00001 >= arg ? arg : flr + significance;
>  }
> 
> -float dcn_bw_max3(float v1, float v2, float v3)
> +__fpu float dcn_bw_max3(float v1, float v2, float v3)
>  {
>  	return v3 > dcn_bw_max2(v1, v2) ? v3 : dcn_bw_max2(v1, v2);
>  }
> 
> -float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
> +__fpu float dcn_bw_max5(float v1, float v2, float v3, float v4, float v5)
>  {
>  	return dcn_bw_max3(v1, v2, v3) > dcn_bw_max2(v4, v5) ? dcn_bw_max3(v1, v2, v3) : dcn_bw_max2(v4, v5);
>  }
> 
> -float dcn_bw_pow(float a, float exp)
> +__fpu float dcn_bw_pow(float a, float exp)
>  {
>  	float temp;
>  	/*ASSERT(exp == (int)exp);*/
> @@ -120,7 +121,7 @@ float dcn_bw_pow(float a, float exp)
>  	}
>  }
> 
> -double dcn_bw_fabs(double a)
> +__fpu double dcn_bw_fabs(double a)
>  {
>  	if (a > 0)
>  		return (a);
> @@ -129,7 +130,7 @@ double dcn_bw_fabs(double a)
>  }
> 
> 
> -float dcn_bw_log(float a, float b)
> +__fpu float dcn_bw_log(float a, float b)
>  {
>  	int * const exp_ptr = (int *)(&a);
>  	int x = *exp_ptr;
> diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
> index 3960a8db94cb..b3e305d9d1c9 100644
> --- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
> +++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
> @@ -435,7 +435,7 @@ static void pipe_ctx_to_e2e_pipe_params (
> 
>  }
> 
> -static void dcn_bw_calc_rq_dlg_ttu(
> +static __fpu void dcn_bw_calc_rq_dlg_ttu(
>  		const struct dc *dc,
>  		const struct dcn_bw_internal_vars *v,
>  		struct pipe_ctx *pipe,
> @@ -1388,7 +1388,7 @@ static unsigned int dcn_find_normalized_clock_vdd_Level(
>  	return vdd_level;
>  }
> 
> -unsigned int dcn_find_dcfclk_suits_all(
> +__fpu unsigned int dcn_find_dcfclk_suits_all(
>  	const struct dc *dc,
>  	struct dc_clocks *clocks)
>  {
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
> index ca807846032f..0cbb58fc7fb8 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
> @@ -115,7 +115,7 @@ static bool is_dual_plane(enum source_format_class source_format)
>  	return ret_val;
>  }
> 
> -static double get_refcyc_per_delivery(struct display_mode_lib *mode_lib,
> +static __fpu double get_refcyc_per_delivery(struct display_mode_lib *mode_lib,
>  		double refclk_freq_in_mhz,
>  		double pclk_freq_in_mhz,
>  		bool odm_combine,
> @@ -162,7 +162,7 @@ static unsigned int get_blk_size_bytes(const enum source_macro_tile_size tile_si
>  		return (4 * 1024);
>  }
> 
> -static void extract_rq_sizing_regs(struct display_mode_lib *mode_lib,
> +static __fpu void extract_rq_sizing_regs(struct display_mode_lib *mode_lib,
>  		display_data_rq_regs_st *rq_regs,
>  		const display_data_rq_sizing_params_st rq_sizing)
>  {
> @@ -313,7 +313,7 @@ static void handle_det_buf_split(struct display_mode_lib *mode_lib,
>  			full_swath_bytes_packed_c);
>  }
> 
> -static void get_meta_and_pte_attr(struct display_mode_lib *mode_lib,
> +static __fpu void get_meta_and_pte_attr(struct display_mode_lib *mode_lib,
>  		display_data_rq_dlg_params_st *rq_dlg_param,
>  		display_data_rq_misc_params_st *rq_misc_param,
>  		display_data_rq_sizing_params_st *rq_sizing_param,
> @@ -763,7 +763,7 @@ void dml20_rq_dlg_get_rq_reg(struct display_mode_lib *mode_lib,
> 
>  // Note: currently taken in as is.
>  // Nice to decouple code from hw register implement and extract code that are repeated for luma and chroma.
> -static void dml20_rq_dlg_get_dlg_params(struct display_mode_lib *mode_lib,
> +static __fpu void dml20_rq_dlg_get_dlg_params(struct display_mode_lib *mode_lib,
>  		const display_e2e_pipe_params_st *e2e_pipe_param,
>  		const unsigned int num_pipes,
>  		const unsigned int pipe_idx,
> @@ -1611,7 +1611,7 @@ void dml20_rq_dlg_get_dlg_reg(struct display_mode_lib *mode_lib,
>  	dml_print("DML_DLG: Calculation for pipe[%d] end\n", pipe_idx);
>  }
> 
> -static void calculate_ttu_cursor(struct display_mode_lib *mode_lib,
> +static __fpu void calculate_ttu_cursor(struct display_mode_lib *mode_lib,
>  		double *refcyc_per_req_delivery_pre_cur,
>  		double *refcyc_per_req_delivery_cur,
>  		double refclk_freq_in_mhz,
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/display_rq_dlg_helpers.c b/drivers/gpu/drm/amd/display/dc/dml/display_rq_dlg_helpers.c
> index e2d82aacd3bc..36541cba3894 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/display_rq_dlg_helpers.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/display_rq_dlg_helpers.c
> @@ -133,7 +133,7 @@ void print__rq_dlg_params_st(struct display_mode_lib *mode_lib, display_rq_dlg_p
>  	dml_print("DML_RQ_DLG_CALC: =====================================\n");
>  }
> 
> -void print__dlg_sys_params_st(struct display_mode_lib *mode_lib, display_dlg_sys_params_st dlg_sys_param)
> +__fpu void print__dlg_sys_params_st(struct display_mode_lib *mode_lib, display_dlg_sys_params_st dlg_sys_param)
>  {
>  	dml_print("DML_RQ_DLG_CALC: =====================================\n");
>  	dml_print("DML_RQ_DLG_CALC: DISPLAY_RQ_DLG_PARAM_ST\n");
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dml_common_defs.c b/drivers/gpu/drm/amd/display/dc/dml/dml_common_defs.c
> index 723af0b2dda0..e86b1d0128cf 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dml_common_defs.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dml_common_defs.c
> @@ -28,7 +28,7 @@
> 
>  #include "dml_inline_defs.h"
> 
> -double dml_round(double a)
> +__fpu double dml_round(double a)
>  {
>  	double round_pt = 0.5;
>  	double ceil = dml_ceil(a, 1);
> diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
> index 87d682d25278..a0b0eb2f0fe3 100644
> --- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
> +++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
> @@ -323,7 +323,7 @@ static inline uint32_t calc_dsc_bpp_x16(uint32_t stream_bandwidth_kbps, uint32_t
>  /* Get DSC bandwidth range based on [min_bpp, max_bpp] target bitrate range, and timing's pixel clock
>   * and uncompressed bandwidth.
>   */
> -static void get_dsc_bandwidth_range(
> +static __fpu void get_dsc_bandwidth_range(
>  		const uint32_t min_bpp,
>  		const uint32_t max_bpp,
>  		const struct dsc_enc_caps *dsc_caps,
> diff --git a/drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c b/drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c
> index 03ae15946c6d..535770930343 100644
> --- a/drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c
> +++ b/drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c
> @@ -40,7 +40,7 @@
>  	break
> 
> 
> -void get_qp_set(qp_set qps, enum colour_mode cm, enum bits_per_comp bpc, enum max_min max_min, float bpp)
> +__fpu void get_qp_set(qp_set qps, enum colour_mode cm, enum bits_per_comp bpc, enum max_min max_min, float bpp)
>  {
>  	int mode = MODE_SELECT(444, 422, 420);
>  	int sel = table_hash(mode, bpc, max_min);
> @@ -85,7 +85,7 @@ void get_qp_set(qp_set qps, enum colour_mode cm, enum bits_per_comp bpc, enum ma
>  	memcpy(qps, table[index].qps, sizeof(qp_set));
>  }
> 
> -double dsc_roundf(double num)
> +__fpu double dsc_roundf(double num)
>  {
>  	if (num < 0.0)
>  		num = num - 0.5;
> @@ -95,7 +95,7 @@ double dsc_roundf(double num)
>  	return (int)(num);
>  }
> 
> -double dsc_ceil(double num)
> +__fpu double dsc_ceil(double num)
>  {
>  	double retval = (int)num;
> 
> @@ -105,7 +105,7 @@ double dsc_ceil(double num)
>  	return (int)retval;
>  }
> 
> -void get_ofs_set(qp_set ofs, enum colour_mode mode, float bpp)
> +__fpu void get_ofs_set(qp_set ofs, enum colour_mode mode, float bpp)
>  {
>  	int   *p = ofs;
> 
> @@ -172,7 +172,7 @@ int median3(int a, int b, int c)
>  	return b;
>  }
> 
> -void calc_rc_params(struct rc_params *rc, enum colour_mode cm, enum bits_per_comp bpc, float bpp, int slice_width, int slice_height, int minor_version)
> +__fpu void calc_rc_params(struct rc_params *rc, enum colour_mode cm, enum bits_per_comp bpc, float bpp, int slice_width, int slice_height, int minor_version)
>  {
>  	float bpp_group;
>  	float initial_xmit_delay_factor;
> diff --git a/drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c b/drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c
> index 1f6e63b71456..38b3c4ac96dd 100644
> --- a/drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c
> +++ b/drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c
> @@ -98,7 +98,7 @@ static void copy_rc_to_cfg(struct drm_dsc_config *dsc_cfg, const struct rc_param
>  		dsc_cfg->rc_buf_thresh[i] = rc->rc_buf_thresh[i];
>  }
> 
> -int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_parameters *dsc_params)
> +__fpu int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_parameters *dsc_params)
>  {
>  	enum colour_mode  mode = pps->convert_rgb ? CM_RGB :
>  							(pps->simple_422  ? CM_444 :
> @@ -115,7 +115,7 @@ int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_par
> 
>  	double d_bytes_per_pixel = dsc_ceil(bpp * slice_width / 8.0) / slice_width;
> 
> -	// TODO: Make sure the formula for calculating this is precise (ceiling vs. floor, and at what point they should be applied)
> +	// TODO: Make sure the formula for calculating this is precise (ceiling vs. floor, and at what point they should be applied
>  	if (pps->native_422 || pps->native_420)
>  		d_bytes_per_pixel /= 2;
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/inc/dcn_calc_math.h b/drivers/gpu/drm/amd/display/dc/inc/dcn_calc_math.h
> index 45a07eeffbb6..d2ea6cf65f7e 100644
> --- a/drivers/gpu/drm/amd/display/dc/inc/dcn_calc_math.h
> +++ b/drivers/gpu/drm/amd/display/dc/inc/dcn_calc_math.h
> @@ -26,6 +26,8 @@
>  #ifndef _DCN_CALC_MATH_H_
>  #define _DCN_CALC_MATH_H_
> 
> +#include <asm/fpu/api.h>
> +
>  float dcn_bw_mod(const float arg1, const float arg2);
>  float dcn_bw_min2(const float arg1, const float arg2);
>  unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2);
> diff --git a/tools/objtool/check.c b/tools/objtool/check.c
> index 1607a698eccd..02a51fedd031 100644
> --- a/tools/objtool/check.c
> +++ b/tools/objtool/check.c
> @@ -252,6 +252,9 @@ static int decode_instructions(struct objtool_file *file)
>  		    strncmp(sec->name, ".discard.", 9))
>  			sec->text = true;
> 
> +		if (!strcmp(sec->name, ".text.fpu"))
> +			sec->fpu = true;
> +
>  		for (offset = 0; offset < sec->len; offset += insn->len) {
>  			insn = malloc(sizeof(*insn));
>  			if (!insn) {
> @@ -288,8 +291,10 @@ static int decode_instructions(struct objtool_file *file)
>  				return -1;
>  			}
> 
> -			sym_for_each_insn(file, func, insn)
> +			sym_for_each_insn(file, func, insn) {
>  				insn->func = func;
> +				insn->fpu_safe = sec->fpu;
> +			}
>  		}
>  	}
> 
> diff --git a/tools/objtool/elf.h b/tools/objtool/elf.h
> index ebbb10c61e24..a743f2f28feb 100644
> --- a/tools/objtool/elf.h
> +++ b/tools/objtool/elf.h
> @@ -39,7 +39,7 @@ struct section {
>  	char *name;
>  	int idx;
>  	unsigned int len;
> -	bool changed, text, rodata;
> +	bool changed, text, rodata, fpu;
>  };
> 
>  struct symbol {
> 
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