1 // SPDX-License-Identifier: MIT
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29 #if defined(CONFIG_X86)
30 #include <asm/fpu/api.h>
31 #elif defined(CONFIG_PPC64)
32 #include <asm/switch_to.h>
33 #include <asm/cputable.h>
37 * DOC: DC FPU manipulation overview
39 * DC core uses FPU operations in multiple parts of the code, which requires a
40 * more specialized way to manage these areas' entrance. To fulfill this
41 * requirement, we created some wrapper functions that encapsulate
42 * kernel_fpu_begin/end to better fit our need in the display component. In
43 * summary, in this file, you can find functions related to FPU operation
47 static DEFINE_PER_CPU(int, fpu_recursion_depth);
50 * dc_assert_fp_enabled - Check if FPU protection is enabled
52 * This function tells if the code is already under FPU protection or not. A
53 * function that works as an API for a set of FPU operations can use this
54 * function for checking if the caller invoked it after DC_FP_START(). For
55 * example, take a look at dcn2x.c file.
57 inline void dc_assert_fp_enabled(void)
61 pcpu = get_cpu_ptr(&fpu_recursion_depth);
63 put_cpu_ptr(&fpu_recursion_depth);
69 * dc_fpu_begin - Enables FPU protection
70 * @function_name: A string containing the function name for debug purposes
73 * @line: A line number where DC_FP_START was invoked for debug purpose
76 * This function is responsible for managing the use of kernel_fpu_begin() with
77 * the advantage of providing an event trace for debugging.
79 * Note: Do not call this function directly; always use DC_FP_START().
81 void dc_fpu_begin(const char *function_name, const int line)
85 pcpu = get_cpu_ptr(&fpu_recursion_depth);
89 #if defined(CONFIG_X86)
91 #elif defined(CONFIG_PPC64)
92 if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
95 } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
97 enable_kernel_altivec();
98 } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
105 TRACE_DCN_FPU(true, function_name, line, *pcpu);
106 put_cpu_ptr(&fpu_recursion_depth);
110 * dc_fpu_end - Disable FPU protection
111 * @function_name: A string containing the function name for debug purposes
112 * @line: A-line number where DC_FP_END was invoked for debug purpose
114 * This function is responsible for managing the use of kernel_fpu_end() with
115 * the advantage of providing an event trace for debugging.
117 * Note: Do not call this function directly; always use DC_FP_END().
119 void dc_fpu_end(const char *function_name, const int line)
123 pcpu = get_cpu_ptr(&fpu_recursion_depth);
126 #if defined(CONFIG_X86)
128 #elif defined(CONFIG_PPC64)
129 if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
130 disable_kernel_vsx();
132 } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
133 disable_kernel_altivec();
135 } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
142 TRACE_DCN_FPU(false, function_name, line, *pcpu);
143 put_cpu_ptr(&fpu_recursion_depth);