87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
|
|
* 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);
|