linux-kernel - [PATCH 2.6.23] oProfile: op_model_athalon.c support for AMD Family10h (Barcelona) Performance Counters

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Date:	Mon, 15 Oct 2007 13:00:27 -0400
From:	"Barry Kasindorf" <barry.kasindorf@....com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.23] oProfile: op_model_athalon.c support for AMD
 Family10h (Barcelona) Performance Counters


oProfile Driver Module Patch for AMD Family10h Kernel 2.6.23
This patch is for controlling the upper 32bits of the event ctrl msrs.
This includes the upper 4 bits of the event select and the Guest Only 
and Host Only bits
This patch is necessary to make Event Based Profiling work reliably on a 
Family10h processor

---
  op_model_athlon.c |   22 ++++++++++++++++------
  1 file changed, 16 insertions(+), 6 deletions(-)
---

Signed-off-by: Barry Kasindorf <barry.kasindorf@....com>
Signed-off-by: Robert Richter <robert.richter@....com>

diff -Naur linux-2.6.23.orig/arch/i386/oprofile/op_model_athlon.c 
linux-2.6.23.pmc/arch/i386/oprofile/op_model_athlon.c
--- linux-2.6.23.orig/arch/i386/oprofile/op_model_athlon.c	2007-10-09 
16:31:38.000000000 -0400
+++ linux-2.6.23.pmc/arch/i386/oprofile/op_model_athlon.c	2007-10-15 
11:02:39.000000000 -0400
@@ -1,6 +1,6 @@
  /**
   * @file op_model_athlon.h
- * athlon / K7 model-specific MSR operations
+ * athlon / K7 / K8 / Family10h model-specific MSR operations
   *
   * @remark Copyright 2002 OProfile authors
   * @remark Read the file COPYING
@@ -31,12 +31,16 @@
  #define CTRL_WRITE(l,h,msrs,c) do {wrmsr(msrs->controls[(c)].addr, 
(l), (h));} while (0)
  #define CTRL_SET_ACTIVE(n) (n |= (1<<22))
  #define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
-#define CTRL_CLEAR(x) (x &= (1<<21))
+#define CTRL_CLEAR_LO(x) (x &= (1<<21))
+#define CTRL_CLEAR_HI(x) ( x &= 0xfffffcf0 )
  #define CTRL_SET_ENABLE(val) (val |= 1<<20)
  #define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16))
  #define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17))
  #define CTRL_SET_UM(val, m) (val |= (m << 8))
-#define CTRL_SET_EVENT(val, e) (val |= e)
+#define CTRL_SET_EVENT_LOW(val, e) (val |= (e & 0xff))
+#define CTRL_SET_EVENT_HIGH(val,e) (val |= ((e >> 8) & 0xf))
+#define CTRL_SET_HOST_ONLY(val, h) (val |= ((h & 1) << 9))
+#define CTRL_SET_GUEST_ONLY(val, h) (val |= ((h & 1) << 8))

  static unsigned long reset_value[NUM_COUNTERS];

@@ -70,7 +74,8 @@
  		if (unlikely(!CTRL_IS_RESERVED(msrs,i)))
  			continue;
  		CTRL_READ(low, high, msrs, i);
-		CTRL_CLEAR(low);
+		CTRL_CLEAR_LO(low);
+		CTRL_CLEAR_HI(low);
  		CTRL_WRITE(low, high, msrs, i);
  	}

@@ -89,12 +94,17 @@
  			CTR_WRITE(counter_config[i].count, msrs, i);

  			CTRL_READ(low, high, msrs, i);
-			CTRL_CLEAR(low);
+			CTRL_CLEAR_LO(low);
+			CTRL_CLEAR_HI(high);
  			CTRL_SET_ENABLE(low);
  			CTRL_SET_USR(low, counter_config[i].user);
  			CTRL_SET_KERN(low, counter_config[i].kernel);
  			CTRL_SET_UM(low, counter_config[i].unit_mask);
-			CTRL_SET_EVENT(low, counter_config[i].event);
+			CTRL_SET_EVENT_LOW(low, counter_config[i].event);
+			CTRL_SET_EVENT_HIGH(high, counter_config[i].event);
+			CTRL_SET_HOST_ONLY(high, 0);
+			CTRL_SET_GUEST_ONLY(high, 0);
+
  			CTRL_WRITE(low, high, msrs, i);
  		} else {
  			reset_value[i] = 0;



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