oprofile, x86: Check IBS capability bits 1 and 2

There are IBS CPUID feature flags in CPUID Fn8000_001B to detect if
the cpu supports IBS fetch sampling (FetchSam) and/or IBS execution
sampling (OpSam). This patch adds checks if the both features are
available.

Spec:

 http://support.amd.com/us/Processor_TechDocs/31116.pdfSigned-off-by: NRobert Richter <robert.richter@amd.com>

arch/x86/oprofile/op_model_amd.c

@@ -70,9 +70,22 @@ static u64 ibs_op_ctl;
  * Same bit mask as for IBS cpuid feature flags (Fn8000_001B_EAX), but
  * bit 0 is used to indicate the existence of IBS.
  */
-#define IBS_CAPS_AVAIL			(1LL<<0)
-#define IBS_CAPS_RDWROPCNT		(1LL<<3)
-#define IBS_CAPS_OPCNT			(1LL<<4)
+#define IBS_CAPS_AVAIL			(1U<<0)
+#define IBS_CAPS_FETCHSAM		(1U<<1)
+#define IBS_CAPS_OPSAM			(1U<<2)
+#define IBS_CAPS_RDWROPCNT		(1U<<3)
+#define IBS_CAPS_OPCNT			(1U<<4)
+
+#define IBS_CAPS_DEFAULT		(IBS_CAPS_AVAIL		\
+					 | IBS_CAPS_FETCHSAM	\
+					 | IBS_CAPS_OPSAM)
+
+/*
+ * IBS APIC setup
+ */
+#define IBSCTL				0x1cc
+#define IBSCTL_LVT_OFFSET_VALID		(1ULL<<8)
+#define IBSCTL_LVT_OFFSET_MASK		0x0F
 
 /*
  * IBS randomization macros
@@ -92,12 +105,12 @@ static u32 get_ibs_caps(void)
 	/* check IBS cpuid feature flags */
 	max_level = cpuid_eax(0x80000000);
 	if (max_level < IBS_CPUID_FEATURES)
-		return IBS_CAPS_AVAIL;
+		return IBS_CAPS_DEFAULT;
 
 	ibs_caps = cpuid_eax(IBS_CPUID_FEATURES);
 	if (!(ibs_caps & IBS_CAPS_AVAIL))
 		/* cpuid flags not valid */
-		return IBS_CAPS_AVAIL;
+		return IBS_CAPS_DEFAULT;
 
 	return ibs_caps;
 }
@@ -527,6 +540,7 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
 	ibs_config.op_enabled = 0;
 	ibs_config.dispatched_ops = 0;
 
+	if (ibs_caps & IBS_CAPS_FETCHSAM) {
 		dir = oprofilefs_mkdir(sb, root, "ibs_fetch");
 		oprofilefs_create_ulong(sb, dir, "enable",
 					&ibs_config.fetch_enabled);
@@ -534,7 +548,9 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
 					&ibs_config.max_cnt_fetch);
 		oprofilefs_create_ulong(sb, dir, "rand_enable",
 					&ibs_config.rand_en);
+	}
 
+	if (ibs_caps & IBS_CAPS_OPSAM) {
 		dir = oprofilefs_mkdir(sb, root, "ibs_op");
 		oprofilefs_create_ulong(sb, dir, "enable",
 					&ibs_config.op_enabled);
@@ -543,6 +559,7 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
 		if (ibs_caps & IBS_CAPS_OPCNT)
 			oprofilefs_create_ulong(sb, dir, "dispatched_ops",
 						&ibs_config.dispatched_ops);
+	}
 
 	return 0;
 }