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

From: Rodrigo Siqueira
Date: Fri Apr 17 2020 - 16:27:47 EST

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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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