Merge branch 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile into perf/urgent

2 files changed, 77 insertions, 42 deletions

diff --git a/arch/powerpc/oprofile/op_model_power4.c b/arch/powerpc/oprofile/op_model_power4.c
index 8ee51a2..e6bec74 100644
--- a/arch/powerpc/oprofile/op_model_power4.c
+++ b/arch/powerpc/oprofile/op_model_power4.c
@@ -261,6 +261,28 @@ static int get_kernel(unsigned long pc, unsigned long mmcra)
 	return is_kernel;
 }
 
+static bool pmc_overflow(unsigned long val)
+{
+	if ((int)val < 0)
+		return true;
+
+	/*
+	 * Events on POWER7 can roll back if a speculative event doesn't
+	 * eventually complete. Unfortunately in some rare cases they will
+	 * raise a performance monitor exception. We need to catch this to
+	 * ensure we reset the PMC. In all cases the PMC will be 256 or less
+	 * cycles from overflow.
+	 *
+	 * We only do this if the first pass fails to find any overflowing
+	 * PMCs because a user might set a period of less than 256 and we
+	 * don't want to mistakenly reset them.
+	 */
+	if (__is_processor(PV_POWER7) && ((0x80000000 - val) <= 256))
+		return true;
+
+	return false;
+}
+
 static void power4_handle_interrupt(struct pt_regs *regs,
 				    struct op_counter_config *ctr)
 {
@@ -281,7 +303,7 @@ static void power4_handle_interrupt(struct pt_regs *regs,
 
 	for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) {
 		val = classic_ctr_read(i);
-		if (val < 0) {
+		if (pmc_overflow(val)) {
 			if (oprofile_running && ctr[i].enabled) {
 				oprofile_add_ext_sample(pc, regs, i, is_kernel);
 				classic_ctr_write(i, reset_value[i]);
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index c3b8e24..9fd8a56 100644
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -316,16 +316,23 @@ static void op_amd_stop_ibs(void)
 		wrmsrl(MSR_AMD64_IBSOPCTL, 0);
 }
 
-static inline int eilvt_is_available(int offset)
+static inline int get_eilvt(int offset)
 {
-	/* check if we may assign a vector */
 	return !setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 1);
 }
 
+static inline int put_eilvt(int offset)
+{
+	return !setup_APIC_eilvt(offset, 0, 0, 1);
+}
+
 static inline int ibs_eilvt_valid(void)
 {
 	int offset;
 	u64 val;
+	int valid = 0;
+
+	preempt_disable();
 
 	rdmsrl(MSR_AMD64_IBSCTL, val);
 	offset = val & IBSCTL_LVT_OFFSET_MASK;
@@ -333,16 +340,20 @@ static inline int ibs_eilvt_valid(void)
 	if (!(val & IBSCTL_LVT_OFFSET_VALID)) {
 		pr_err(FW_BUG "cpu %d, invalid IBS interrupt offset %d (MSR%08X=0x%016llx)\n",
 		       smp_processor_id(), offset, MSR_AMD64_IBSCTL, val);
-		return 0;
+		goto out;
 	}
 
-	if (!eilvt_is_available(offset)) {
+	if (!get_eilvt(offset)) {
 		pr_err(FW_BUG "cpu %d, IBS interrupt offset %d not available (MSR%08X=0x%016llx)\n",
 		       smp_processor_id(), offset, MSR_AMD64_IBSCTL, val);
-		return 0;
+		goto out;
 	}
 
-	return 1;
+	valid = 1;
+out:
+	preempt_enable();
+
+	return valid;
 }
 
 static inline int get_ibs_offset(void)
@@ -600,67 +611,69 @@ static int setup_ibs_ctl(int ibs_eilvt_off)
 
 static int force_ibs_eilvt_setup(void)
 {
-	int i;
+	int offset;
 	int ret;
 
-	/* find the next free available EILVT entry */
-	for (i = 1; i < 4; i++) {
-		if (!eilvt_is_available(i))
-			continue;
-		ret = setup_ibs_ctl(i);
-		if (ret)
-			return ret;
-		pr_err(FW_BUG "using offset %d for IBS interrupts\n", i);
-		return 0;
+	/*
+	 * find the next free available EILVT entry, skip offset 0,
+	 * pin search to this cpu
+	 */
+	preempt_disable();
+	for (offset = 1; offset < APIC_EILVT_NR_MAX; offset++) {
+		if (get_eilvt(offset))
+			break;
 	}
+	preempt_enable();
 
-	printk(KERN_DEBUG "No EILVT entry available\n");
-
-	return -EBUSY;
-}
-
-static int __init_ibs_nmi(void)
-{
-	int ret;
-
-	if (ibs_eilvt_valid())
-		return 0;
+	if (offset == APIC_EILVT_NR_MAX) {
+		printk(KERN_DEBUG "No EILVT entry available\n");
+		return -EBUSY;
+	}
 
-	ret = force_ibs_eilvt_setup();
+	ret = setup_ibs_ctl(offset);
 	if (ret)
-		return ret;
+		goto out;
 
-	if (!ibs_eilvt_valid())
-		return -EFAULT;
+	if (!ibs_eilvt_valid()) {
+		ret = -EFAULT;
+		goto out;
+	}
 
+	pr_err(FW_BUG "using offset %d for IBS interrupts\n", offset);
 	pr_err(FW_BUG "workaround enabled for IBS LVT offset\n");
 
 	return 0;
+out:
+	preempt_disable();
+	put_eilvt(offset);
+	preempt_enable();
+	return ret;
 }
 
 /*
  * check and reserve APIC extended interrupt LVT offset for IBS if
  * available
- *
- * init_ibs() preforms implicitly cpu-local operations, so pin this
- * thread to its current CPU
  */
 
 static void init_ibs(void)
 {
-	preempt_disable();
-
 	ibs_caps = get_ibs_caps();
+
 	if (!ibs_caps)
+		return;
+
+	if (ibs_eilvt_valid())
 		goto out;
 
-	if (__init_ibs_nmi() < 0)
-		ibs_caps = 0;
-	else
-		printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n", ibs_caps);
+	if (!force_ibs_eilvt_setup())
+		goto out;
+
+	/* Failed to setup ibs */
+	ibs_caps = 0;
+	return;
 
 out:
-	preempt_enable();
+	printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n", ibs_caps);
 }
 
 static int (*create_arch_files)(struct super_block *sb, struct dentry *root);