| /* |
| * Routines to identify additional cpu features that are scattered in |
| * cpuid space. |
| */ |
| #include <linux/cpu.h> |
| |
| #include <asm/pat.h> |
| #include <asm/processor.h> |
| |
| #include <asm/apic.h> |
| |
| struct cpuid_bit { |
| u16 feature; |
| u8 reg; |
| u8 bit; |
| u32 level; |
| u32 sub_leaf; |
| }; |
| |
| /* Please keep the leaf sorted by cpuid_bit.level for faster search. */ |
| static const struct cpuid_bit cpuid_bits[] = { |
| { X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 }, |
| { X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 }, |
| { X86_FEATURE_INTEL_PT, CPUID_EBX, 25, 0x00000007, 0 }, |
| { X86_FEATURE_AVX512_4VNNIW, CPUID_EDX, 2, 0x00000007, 0 }, |
| { X86_FEATURE_AVX512_4FMAPS, CPUID_EDX, 3, 0x00000007, 0 }, |
| { X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 }, |
| { X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 }, |
| { X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 }, |
| { X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 }, |
| { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 }, |
| { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, |
| { 0, 0, 0, 0, 0 } |
| }; |
| |
| void init_scattered_cpuid_features(struct cpuinfo_x86 *c) |
| { |
| u32 max_level; |
| u32 regs[4]; |
| const struct cpuid_bit *cb; |
| |
| for (cb = cpuid_bits; cb->feature; cb++) { |
| |
| /* Verify that the level is valid */ |
| max_level = cpuid_eax(cb->level & 0xffff0000); |
| if (max_level < cb->level || |
| max_level > (cb->level | 0xffff)) |
| continue; |
| |
| cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX], |
| ®s[CPUID_EBX], ®s[CPUID_ECX], |
| ®s[CPUID_EDX]); |
| |
| if (regs[cb->reg] & (1 << cb->bit)) |
| set_cpu_cap(c, cb->feature); |
| } |
| } |
| |
| u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf, |
| enum cpuid_regs_idx reg) |
| { |
| const struct cpuid_bit *cb; |
| u32 cpuid_val = 0; |
| |
| for (cb = cpuid_bits; cb->feature; cb++) { |
| |
| if (level > cb->level) |
| continue; |
| |
| if (level < cb->level) |
| break; |
| |
| if (reg == cb->reg && sub_leaf == cb->sub_leaf) { |
| if (cpu_has(&boot_cpu_data, cb->feature)) |
| cpuid_val |= BIT(cb->bit); |
| } |
| } |
| |
| return cpuid_val; |
| } |
| EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf); |