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| /*
| * 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_CQM_LLC, CPUID_EDX, 1, 0x0000000f, 0 },
| { X86_FEATURE_CQM_OCCUP_LLC, CPUID_EDX, 0, 0x0000000f, 1 },
| { X86_FEATURE_CQM_MBM_TOTAL, CPUID_EDX, 1, 0x0000000f, 1 },
| { X86_FEATURE_CQM_MBM_LOCAL, CPUID_EDX, 2, 0x0000000f, 1 },
| { 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_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 },
| { X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 },
| { 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 },
| { X86_FEATURE_SME, CPUID_EAX, 0, 0x8000001f, 0 },
| { X86_FEATURE_SEV, CPUID_EAX, 1, 0x8000001f, 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);
|
|
