GNU C Library master sources branch master updated. glibc-2.24-493-g2702856

[andros at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=2702856bf45c82cf8e69f2064f5aa15c0ceb6359

commit 2702856bf45c82cf8e69f2064f5aa15c0ceb6359
Author: Andrew Senkevich <andrew.senkevich@intel.com>
Date:   Mon Dec 19 13:20:31 2016 +0300

    Disable TSX on some Haswell processors.
    
    Patch disables Intel TSX on some Haswell processors to avoid TSX
    on kernels that weren't updated with the latest microcode package
    (which disables broken feature by default).
    
        * sysdeps/x86/cpu-features.c (get_common_indeces): Add
        stepping identification.
        (init_cpu_features): Add handle of Haswell.

diff --git a/ChangeLog b/ChangeLog
index 8782df9..6a27320 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-12-19  Andrew Senkevich  <andrew.senkevich@intel.com>
+
+	* sysdeps/x86/cpu-features.c (get_common_indeces): Add
+	stepping identification.
+	(init_cpu_features): Add handle of Haswell.
+
 2016-11-25  Jim Meyering  <meyering@fb.com>
 
 	[BZ #20386]
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index e228a76..0ef98e6 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -22,7 +22,7 @@
 static void
 get_common_indeces (struct cpu_features *cpu_features,
 		    unsigned int *family, unsigned int *model,
-		    unsigned int *extended_model)
+		    unsigned int *extended_model, unsigned int *stepping)
 {
   if (family)
     {
@@ -34,6 +34,7 @@ get_common_indeces (struct cpu_features *cpu_features,
       *family = (eax >> 8) & 0x0f;
       *model = (eax >> 4) & 0x0f;
       *extended_model = (eax >> 12) & 0xf0;
+      *stepping = eax & 0x0f;
       if (*family == 0x0f)
 	{
 	  *family += (eax >> 20) & 0xff;
@@ -116,11 +117,12 @@ init_cpu_features (struct cpu_features *cpu_features)
   /* This spells out "GenuineIntel".  */
   if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
     {
-      unsigned int extended_model;
+      unsigned int extended_model, stepping;
 
       kind = arch_kind_intel;
 
-      get_common_indeces (cpu_features, &family, &model, &extended_model);
+      get_common_indeces (cpu_features, &family, &model, &extended_model,
+			  &stepping);
 
       if (family == 0x06)
 	{
@@ -201,6 +203,20 @@ init_cpu_features (struct cpu_features *cpu_features)
 		    | bit_arch_Fast_Unaligned_Copy
 		    | bit_arch_Prefer_PMINUB_for_stringop);
 	      break;
+
+	    case 0x3f:
+	      /* Xeon E7 v3 with stepping >= 4 has working TSX.  */
+	      if (stepping >= 4)
+		break;
+	    case 0x3c:
+	    case 0x45:
+	    case 0x46:
+	      /* Disable Intel TSX on Haswell processors (except Xeon E7 v3
+		 with stepping >= 4) to avoid TSX on kernels that weren't
+		 updated with the latest microcode package (which disables
+		 broken feature by default).  */
+	      cpu_features->cpuid[COMMON_CPUID_INDEX_7].ebx &= ~(bit_cpu_RTM);
+	      break;
 	    }
 	}
 
@@ -227,11 +243,12 @@ init_cpu_features (struct cpu_features *cpu_features)
   /* This spells out "AuthenticAMD".  */
   else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
     {
-      unsigned int extended_model;
+      unsigned int extended_model, stepping;
 
       kind = arch_kind_amd;
 
-      get_common_indeces (cpu_features, &family, &model, &extended_model);
+      get_common_indeces (cpu_features, &family, &model, &extended_model,
+			  &stepping);
 
       ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
 
@@ -268,7 +285,7 @@ init_cpu_features (struct cpu_features *cpu_features)
   else
     {
       kind = arch_kind_other;
-      get_common_indeces (cpu_features, NULL, NULL, NULL);
+      get_common_indeces (cpu_features, NULL, NULL, NULL, NULL);
     }
 
   /* Support i586 if CX8 is available.  */

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                  |    6 ++++++
 sysdeps/x86/cpu-features.c |   29 +++++++++++++++++++++++------
 2 files changed, 29 insertions(+), 6 deletions(-)


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