145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright 2021 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: AMD
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*
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*/
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#include "dc_trace.h"
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#if defined(CONFIG_X86)
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#include <asm/fpu/api.h>
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#elif defined(CONFIG_PPC64)
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#include <asm/switch_to.h>
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#include <asm/cputable.h>
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#endif
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/**
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* DOC: DC FPU manipulation overview
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*
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* DC core uses FPU operations in multiple parts of the code, which requires a
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* more specialized way to manage these areas' entrance. To fulfill this
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* requirement, we created some wrapper functions that encapsulate
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* kernel_fpu_begin/end to better fit our need in the display component. In
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* summary, in this file, you can find functions related to FPU operation
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* management.
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*/
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static DEFINE_PER_CPU(int, fpu_recursion_depth);
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/**
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* dc_assert_fp_enabled - Check if FPU protection is enabled
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*
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* This function tells if the code is already under FPU protection or not. A
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* function that works as an API for a set of FPU operations can use this
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* function for checking if the caller invoked it after DC_FP_START(). For
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* example, take a look at dcn20_fpu.c file.
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*/
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inline void dc_assert_fp_enabled(void)
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{
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int *pcpu, depth = 0;
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pcpu = get_cpu_ptr(&fpu_recursion_depth);
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depth = *pcpu;
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put_cpu_ptr(&fpu_recursion_depth);
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ASSERT(depth >= 1);
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}
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/**
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* dc_fpu_begin - Enables FPU protection
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* @function_name: A string containing the function name for debug purposes
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* (usually __func__)
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*
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* @line: A line number where DC_FP_START was invoked for debug purpose
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* (usually __LINE__)
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*
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* This function is responsible for managing the use of kernel_fpu_begin() with
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* the advantage of providing an event trace for debugging.
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*
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* Note: Do not call this function directly; always use DC_FP_START().
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*/
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void dc_fpu_begin(const char *function_name, const int line)
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{
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int *pcpu;
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pcpu = get_cpu_ptr(&fpu_recursion_depth);
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*pcpu += 1;
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if (*pcpu == 1) {
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#if defined(CONFIG_X86)
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kernel_fpu_begin();
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#elif defined(CONFIG_PPC64)
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if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
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preempt_disable();
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enable_kernel_vsx();
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} else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
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preempt_disable();
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enable_kernel_altivec();
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} else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
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preempt_disable();
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enable_kernel_fp();
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}
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#endif
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}
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TRACE_DCN_FPU(true, function_name, line, *pcpu);
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put_cpu_ptr(&fpu_recursion_depth);
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}
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/**
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* dc_fpu_end - Disable FPU protection
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* @function_name: A string containing the function name for debug purposes
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* @line: A-line number where DC_FP_END was invoked for debug purpose
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*
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* This function is responsible for managing the use of kernel_fpu_end() with
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* the advantage of providing an event trace for debugging.
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*
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* Note: Do not call this function directly; always use DC_FP_END().
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*/
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void dc_fpu_end(const char *function_name, const int line)
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{
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int *pcpu;
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pcpu = get_cpu_ptr(&fpu_recursion_depth);
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*pcpu -= 1;
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if (*pcpu <= 0) {
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#if defined(CONFIG_X86)
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kernel_fpu_end();
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#elif defined(CONFIG_PPC64)
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if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
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disable_kernel_vsx();
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preempt_enable();
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} else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
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disable_kernel_altivec();
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preempt_enable();
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} else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
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disable_kernel_fp();
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preempt_enable();
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}
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#endif
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}
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TRACE_DCN_FPU(false, function_name, line, *pcpu);
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put_cpu_ptr(&fpu_recursion_depth);
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}
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