^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* Declare dependencies between CPUIDs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <asm/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) struct cpuid_dep {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) unsigned int feature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) unsigned int depends;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Table of CPUID features that depend on others.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * This only includes dependencies that can be usefully disabled, not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * features part of the base set (like FPU).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Note this all is not __init / __initdata because it can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * called from cpu hotplug. It shouldn't do anything in this case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * but it's difficult to tell that to the init reference checker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static const struct cpuid_dep cpuid_deps[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) { X86_FEATURE_FXSR, X86_FEATURE_FPU },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) { X86_FEATURE_XSAVEOPT, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) { X86_FEATURE_XSAVEC, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) { X86_FEATURE_XSAVES, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) { X86_FEATURE_AVX, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) { X86_FEATURE_PKU, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) { X86_FEATURE_MPX, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) { X86_FEATURE_XGETBV1, X86_FEATURE_XSAVE },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) { X86_FEATURE_CMOV, X86_FEATURE_FXSR },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) { X86_FEATURE_MMX, X86_FEATURE_FXSR },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) { X86_FEATURE_MMXEXT, X86_FEATURE_MMX },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) { X86_FEATURE_FXSR_OPT, X86_FEATURE_FXSR },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) { X86_FEATURE_XSAVE, X86_FEATURE_FXSR },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) { X86_FEATURE_XMM, X86_FEATURE_FXSR },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) { X86_FEATURE_XMM2, X86_FEATURE_XMM },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) { X86_FEATURE_XMM3, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) { X86_FEATURE_XMM4_1, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) { X86_FEATURE_XMM4_2, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) { X86_FEATURE_XMM3, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) { X86_FEATURE_PCLMULQDQ, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) { X86_FEATURE_SSSE3, X86_FEATURE_XMM2, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) { X86_FEATURE_F16C, X86_FEATURE_XMM2, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) { X86_FEATURE_AES, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) { X86_FEATURE_SHA_NI, X86_FEATURE_XMM2 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) { X86_FEATURE_FMA, X86_FEATURE_AVX },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) { X86_FEATURE_AVX2, X86_FEATURE_AVX, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) { X86_FEATURE_AVX512F, X86_FEATURE_AVX, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) { X86_FEATURE_AVX512IFMA, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) { X86_FEATURE_AVX512PF, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) { X86_FEATURE_AVX512ER, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) { X86_FEATURE_AVX512CD, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) { X86_FEATURE_AVX512DQ, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) { X86_FEATURE_AVX512BW, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) { X86_FEATURE_AVX512VL, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) { X86_FEATURE_AVX512VBMI, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) { X86_FEATURE_AVX512_VBMI2, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) { X86_FEATURE_GFNI, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) { X86_FEATURE_VAES, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) { X86_FEATURE_VPCLMULQDQ, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) { X86_FEATURE_AVX512_VNNI, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) { X86_FEATURE_AVX512_BITALG, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) { X86_FEATURE_AVX512_4VNNIW, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) { X86_FEATURE_AVX512_4FMAPS, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) { X86_FEATURE_AVX512_VPOPCNTDQ, X86_FEATURE_AVX512F },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) { X86_FEATURE_AVX512_VP2INTERSECT, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) { X86_FEATURE_CQM_OCCUP_LLC, X86_FEATURE_CQM_LLC },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) { X86_FEATURE_CQM_MBM_TOTAL, X86_FEATURE_CQM_LLC },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) { X86_FEATURE_CQM_MBM_LOCAL, X86_FEATURE_CQM_LLC },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) { X86_FEATURE_AVX512_BF16, X86_FEATURE_AVX512VL },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) { X86_FEATURE_PER_THREAD_MBA, X86_FEATURE_MBA },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static inline void clear_feature(struct cpuinfo_x86 *c, unsigned int feature)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * Note: This could use the non atomic __*_bit() variants, but the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * rest of the cpufeature code uses atomics as well, so keep it for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * consistency. Cleanup all of it separately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) clear_cpu_cap(&boot_cpu_data, feature);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) set_bit(feature, (unsigned long *)cpu_caps_cleared);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) clear_bit(feature, (unsigned long *)c->x86_capability);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Take the capabilities and the BUG bits into account */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define MAX_FEATURE_BITS ((NCAPINTS + NBUGINTS) * sizeof(u32) * 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static void do_clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int feature)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) DECLARE_BITMAP(disable, MAX_FEATURE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) const struct cpuid_dep *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) bool changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (WARN_ON(feature >= MAX_FEATURE_BITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) clear_feature(c, feature);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* Collect all features to disable, handling dependencies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) memset(disable, 0, sizeof(disable));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) __set_bit(feature, disable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* Loop until we get a stable state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) for (d = cpuid_deps; d->feature; d++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!test_bit(d->depends, disable))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (__test_and_set_bit(d->feature, disable))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) clear_feature(c, d->feature);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) } while (changed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int feature)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) do_clear_cpu_cap(c, feature);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) void setup_clear_cpu_cap(unsigned int feature)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) do_clear_cpu_cap(NULL, feature);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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