Contributors: 22
Author Tokens Token Proportion Commits Commit Proportion
Venkatesh Pallipadi 131 28.11% 1 3.12%
Fenghua Yu 96 20.60% 4 12.50%
H. Peter Anvin 28 6.01% 1 3.12%
Sean Christopherson 24 5.15% 1 3.12%
Sandipan Das 24 5.15% 2 6.25%
Suresh B. Siddha 18 3.86% 2 6.25%
He Chen 16 3.43% 2 6.25%
Borislav Petkov 13 2.79% 2 6.25%
Sherry Hurwitz 13 2.79% 1 3.12%
Vikas Shivappa 12 2.58% 1 3.12%
Tony Luck 12 2.58% 1 3.12%
Pawan Gupta 12 2.58% 1 3.12%
Kai Huang 12 2.58% 1 3.12%
Andi Kleen 11 2.36% 2 6.25%
Thomas Renninger 11 2.36% 1 3.12%
Piotr Luc 10 2.15% 1 3.12%
Alexander Shishkin 8 1.72% 1 3.12%
Thomas Gleixner 5 1.07% 2 6.25%
Jacob Shin 4 0.86% 1 3.12%
Jeremy Fitzhardinge 3 0.64% 1 3.12%
Ingo Molnar 2 0.43% 2 6.25%
Maxime Jayat 1 0.21% 1 3.12%
Total 466 32


/*
 *	Routines to identify additional cpu features that are scattered in
 *	cpuid space.
 */
#include <linux/cpu.h>

#include <asm/memtype.h>
#include <asm/apic.h>
#include <asm/processor.h>

#include "cpu.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.
 * X86_FEATURE_MBA is supported by both Intel and AMD. But the CPUID
 * levels are different and there is a separate entry for each.
 */
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_PPIN,	CPUID_EBX,  0, 0x00000007, 1 },
	{ X86_FEATURE_RRSBA_CTRL,	CPUID_EDX,  2, 0x00000007, 2 },
	{ 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_PER_THREAD_MBA,	CPUID_ECX,  0, 0x00000010, 3 },
	{ X86_FEATURE_SGX1,		CPUID_EAX,  0, 0x00000012, 0 },
	{ X86_FEATURE_SGX2,		CPUID_EAX,  1, 0x00000012, 0 },
	{ X86_FEATURE_SGX_EDECCSSA,	CPUID_EAX, 11, 0x00000012, 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_MBA,		CPUID_EBX,  6, 0x80000008, 0 },
	{ X86_FEATURE_PERFMON_V2,	CPUID_EAX,  0, 0x80000022, 0 },
	{ X86_FEATURE_AMD_LBR_V2,	CPUID_EAX,  1, 0x80000022, 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, &regs[CPUID_EAX],
			    &regs[CPUID_EBX], &regs[CPUID_ECX],
			    &regs[CPUID_EDX]);

		if (regs[cb->reg] & (1 << cb->bit))
			set_cpu_cap(c, cb->feature);
	}
}