svn commit: r237196 - head/sys/dev/hwpmc

[Davide Italiano]

Author: davide
Date: Sun Jun 17 13:48:39 2012
New Revision: 237196
URL: http://svn.freebsd.org/changeset/base/237196

Log:
  Disable hwpmc(4) support for Intel Xeon Sandy Bridge (Model 0x2D).
  Due to some differences in MSRs between Xeon Sandy Bridge and Core Sandy
  Bridge (Model 0x2A), wrmsr() may generate in a GP# fault exception and so a
  panic of the machine.
  
  Approved by:		gnn (mentor)
  MFC after:		3 days

Modified:
  head/sys/dev/hwpmc/hwpmc_intel.c

Modified: head/sys/dev/hwpmc/hwpmc_intel.c
==============================================================================
--- head/sys/dev/hwpmc/hwpmc_intel.c	Sun Jun 17 13:03:50 2012	(r237195)
+++ head/sys/dev/hwpmc/hwpmc_intel.c	Sun Jun 17 13:48:39 2012	(r237196)
@@ -143,7 +143,6 @@ pmc_intel_initialize(void)
 			nclasses = 5;
 			break;
 		case 0x2A:	/* Per Intel document 253669-039US 05/2011. */
-		case 0x2D:	/* Per Intel document 253669-041US 12/2011. */	
 			cputype = PMC_CPU_INTEL_SANDYBRIDGE;
 			nclasses = 5;
 			break;