Fix misreporting of #cores as #hyperthreads for Q9550

For the Q9550, in x86_64 mode, /proc/cpuinfo mistakenly
thinks the #cores present is the #hyperthreads present.
i386 mode was not examined but is assumed to have the
same problem.

A backport of the following three 2.6.29-rc1 patches
fixes the problem:

 066941bd4eeb159307a5d7d795100d0887c00442:
    [PATCH] x86: unmask CPUID levels on Intel CPUs
 99fb4d349db7e7dacb2099c5cc320a9e2d31c1ef:
    [PATCH] x86: unmask CPUID levels on Intel CPUs, fix
 bdf21a49bab28f0d9613e8d8724ef9c9168b61b9:
    [PATCH] x86: add MSR_IA32_MISC_ENABLE bits to <asm/msr-index.h>

From the first patch: "If the CPUID limit bit in
MSR_IA32_MISC_ENABLE is set, clear it to make all CPUID
information available.  This is required for some features
to work, in particular XSAVE."

Originally-Developed-by: H. Peter Anvin <hpa@linux.intel.com>
Backported-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index e38859d577a117e1cc1ae2cf75e278c595cfb369..07684f8b32aa203460fcb3d0de45e44cb47efd98 100644 (file)
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -200,6 +200,35 @@
 #define MSR_IA32_THERM_STATUS          0x0000019c
 #define MSR_IA32_MISC_ENABLE           0x000001a0
 
+/* MISC_ENABLE bits: architectural */
+#define MSR_IA32_MISC_ENABLE_FAST_STRING       (1ULL << 0)
+#define MSR_IA32_MISC_ENABLE_TCC               (1ULL << 1)
+#define MSR_IA32_MISC_ENABLE_EMON              (1ULL << 7)
+#define MSR_IA32_MISC_ENABLE_BTS_UNAVAIL       (1ULL << 11)
+#define MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL      (1ULL << 12)
+#define MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP        (1ULL << 16)
+#define MSR_IA32_MISC_ENABLE_MWAIT             (1ULL << 18)
+#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID       (1ULL << 22)
+#define MSR_IA32_MISC_ENABLE_XTPR_DISABLE      (1ULL << 23)
+#define MSR_IA32_MISC_ENABLE_XD_DISABLE                (1ULL << 34)
+
+/* MISC_ENABLE bits: model-specific, meaning may vary from core to core */
+#define MSR_IA32_MISC_ENABLE_X87_COMPAT                (1ULL << 2)
+#define MSR_IA32_MISC_ENABLE_TM1               (1ULL << 3)
+#define MSR_IA32_MISC_ENABLE_SPLIT_LOCK_DISABLE        (1ULL << 4)
+#define MSR_IA32_MISC_ENABLE_L3CACHE_DISABLE   (1ULL << 6)
+#define MSR_IA32_MISC_ENABLE_SUPPRESS_LOCK     (1ULL << 8)
+#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE  (1ULL << 9)
+#define MSR_IA32_MISC_ENABLE_FERR              (1ULL << 10)
+#define MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX    (1ULL << 10)
+#define MSR_IA32_MISC_ENABLE_TM2               (1ULL << 13)
+#define MSR_IA32_MISC_ENABLE_ADJ_PREF_DISABLE  (1ULL << 19)
+#define MSR_IA32_MISC_ENABLE_SPEEDSTEP_LOCK    (1ULL << 20)
+#define MSR_IA32_MISC_ENABLE_L1D_CONTEXT       (1ULL << 24)
+#define MSR_IA32_MISC_ENABLE_DCU_PREF_DISABLE  (1ULL << 37)
+#define MSR_IA32_MISC_ENABLE_TURBO_DISABLE     (1ULL << 38)
+#define MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE   (1ULL << 39)
+
 /* Intel Model 6 */
 #define MSR_P6_EVNTSEL0                        0x00000186
 #define MSR_P6_EVNTSEL1                        0x00000187

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 57e3fbafb4f2506e4d2bb2570260d8bbd4cb96f7..d8cfe546fb11e169129c6a16884f5a775c28fd1e 100644 (file)
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -30,6 +30,19 @@
 
 static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
 {
+       /* Unmask CPUID levels if masked: */
+       if (c->x86 == 6 && c->x86_model >= 15) {
+               u64 misc_enable;
+
+               rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+
+               if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
+                       misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
+                       wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+                       c->cpuid_level = cpuid_eax(0);
+               }
+       }
+
        if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
                (c->x86 == 0x6 && c->x86_model >= 0x0e))
                set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);