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From: tip-bot for Suresh Siddha on 19 Jul 2010 21:00
Commit-ID: edb18f8ab02843453306601c4aa697f9691129cd
Gitweb: http://git.kernel.org/tip/edb18f8ab02843453306601c4aa697f9691129cd
Author: Suresh Siddha <suresh.b.siddha(a)intel.com>
AuthorDate: Mon, 19 Jul 2010 16:05:50 -0700
Committer: H. Peter Anvin <hpa(a)linux.intel.com>
CommitDate: Mon, 19 Jul 2010 16:47:59 -0700

x86, cpu: Make init_scattered_cpuid_features() consider cpuid subleaves

Some cpuid features (like xsaveopt) are enumerated using cpuid
subleaves.

Extend init_scattered_cpuid_features() to take subleaf into account.

Signed-off-by: Suresh Siddha <suresh.b.siddha(a)intel.com>
LKML-Reference: <20100719230205.439900717(a)sbs-t61.sc.intel.com>
Signed-off-by: H. Peter Anvin <hpa(a)linux.intel.com>
---
arch/x86/kernel/cpu/addon_cpuid_features.c | 25 +++++++++++++------------
1 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index 7369b4c..03cf24a 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -14,6 +14,7 @@ struct cpuid_bit {
u8 reg;
u8 bit;
u32 level;
+ u32 sub_leaf;
};

enum cpuid_regs {
@@ -30,16 +31,16 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
const struct cpuid_bit *cb;

static const struct cpuid_bit __cpuinitconst cpuid_bits[] = {
- { X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 },
- { X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006 },
- { X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006 },
- { X86_FEATURE_EPB, CR_ECX, 3, 0x00000006 },
- { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007 },
- { X86_FEATURE_NPT, CR_EDX, 0, 0x8000000a },
- { X86_FEATURE_LBRV, CR_EDX, 1, 0x8000000a },
- { X86_FEATURE_SVML, CR_EDX, 2, 0x8000000a },
- { X86_FEATURE_NRIPS, CR_EDX, 3, 0x8000000a },
- { 0, 0, 0, 0 }
+ { X86_FEATURE_IDA, CR_EAX, 1, 0x00000006, 0 },
+ { X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006, 0 },
+ { X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006, 0 },
+ { X86_FEATURE_EPB, CR_ECX, 3, 0x00000006, 0 },
+ { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007, 0 },
+ { X86_FEATURE_NPT, CR_EDX, 0, 0x8000000a, 0 },
+ { X86_FEATURE_LBRV, CR_EDX, 1, 0x8000000a, 0 },
+ { X86_FEATURE_SVML, CR_EDX, 2, 0x8000000a, 0 },
+ { X86_FEATURE_NRIPS, CR_EDX, 3, 0x8000000a, 0 },
+ { 0, 0, 0, 0, 0 }
};

for (cb = cpuid_bits; cb->feature; cb++) {
@@ -50,8 +51,8 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
max_level > (cb->level | 0xffff))
continue;

- cpuid(cb->level, &regs[CR_EAX], &regs[CR_EBX],
- &regs[CR_ECX], &regs[CR_EDX]);
+ cpuid_count(cb->level, cb->sub_leaf, &regs[CR_EAX],
+ &regs[CR_EBX], &regs[CR_ECX], &regs[CR_EDX]);

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