[patch V3 05/28] x86/perf/intel_uncore: Cleanup hardware on exit

[Thomas Gleixner <tglx@linutronix.de>]

[-- Attachment #1: x86-perf-intel_uncore--Cleanup-hardware-on-exit.patch --]
[-- Type: text/plain, Size: 4817 bytes --]

When tearing down the boxes nothing undoes the hardware state which was setup
by box->init_box(). Add a box->exit_box() callback and implement it for the
uncores which have an init_box() callback.

This misses the cleanup in the error exit pathes, but I cannot be bothered to
implement it before cleaning up the rest of the driver, which makes that task
way simpler.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: Removed the code which affects IVB and newer as Liang pointed out that
    it's incorrect
---
 arch/x86/kernel/cpu/perf_event_intel_uncore.c       |    6 +++++-
 arch/x86/kernel/cpu/perf_event_intel_uncore.h       |    9 +++++++++
 arch/x86/kernel/cpu/perf_event_intel_uncore_nhmex.c |    6 ++++++
 arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c   |   13 +++++++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -937,6 +937,7 @@ static int uncore_pci_probe(struct pci_d
 		raw_spin_lock(&uncore_box_lock);
 		list_del(&box->list);
 		raw_spin_unlock(&uncore_box_lock);
+		uncore_box_exit(box);
 		kfree(box);
 	}
 	return ret;
@@ -982,6 +983,7 @@ static void uncore_pci_remove(struct pci
 	}
 
 	WARN_ON_ONCE(atomic_read(&box->refcnt) != 1);
+	uncore_box_exit(box);
 	kfree(box);
 
 	if (last_box)
@@ -1091,8 +1093,10 @@ static void uncore_cpu_dying(int cpu)
 			pmu = &type->pmus[j];
 			box = *per_cpu_ptr(pmu->box, cpu);
 			*per_cpu_ptr(pmu->box, cpu) = NULL;
-			if (box && atomic_dec_and_test(&box->refcnt))
+			if (box && atomic_dec_and_test(&box->refcnt)) {
 				list_add(&box->list, &boxes_to_free);
+				uncore_box_exit(box);
+			}
 		}
 	}
 }
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.h
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
@@ -61,6 +61,7 @@ struct intel_uncore_type {
 
 struct intel_uncore_ops {
 	void (*init_box)(struct intel_uncore_box *);
+	void (*exit_box)(struct intel_uncore_box *);
 	void (*disable_box)(struct intel_uncore_box *);
 	void (*enable_box)(struct intel_uncore_box *);
 	void (*disable_event)(struct intel_uncore_box *, struct perf_event *);
@@ -306,6 +307,14 @@ static inline void uncore_box_init(struc
 	}
 }
 
+static inline void uncore_box_exit(struct intel_uncore_box *box)
+{
+	if (test_and_clear_bit(UNCORE_BOX_FLAG_INITIATED, &box->flags)) {
+		if (box->pmu->type->ops->exit_box)
+			box->pmu->type->ops->exit_box(box);
+	}
+}
+
 static inline bool uncore_box_is_fake(struct intel_uncore_box *box)
 {
 	return (box->phys_id < 0);
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore_nhmex.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore_nhmex.c
@@ -201,6 +201,11 @@ static void nhmex_uncore_msr_init_box(st
 	wrmsrl(NHMEX_U_MSR_PMON_GLOBAL_CTL, NHMEX_U_PMON_GLOBAL_EN_ALL);
 }
 
+static void nhmex_uncore_msr_exit_box(struct intel_uncore_box *box)
+{
+	wrmsrl(NHMEX_U_MSR_PMON_GLOBAL_CTL, 0);
+}
+
 static void nhmex_uncore_msr_disable_box(struct intel_uncore_box *box)
 {
 	unsigned msr = uncore_msr_box_ctl(box);
@@ -250,6 +255,7 @@ static void nhmex_uncore_msr_enable_even
 
 #define NHMEX_UNCORE_OPS_COMMON_INIT()				\
 	.init_box	= nhmex_uncore_msr_init_box,		\
+	.exit_box	= nhmex_uncore_msr_exit_box,		\
 	.disable_box	= nhmex_uncore_msr_disable_box,		\
 	.enable_box	= nhmex_uncore_msr_enable_box,		\
 	.disable_event	= nhmex_uncore_msr_disable_event,	\
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore_snb.c
@@ -95,6 +95,12 @@ static void snb_uncore_msr_init_box(stru
 	}
 }
 
+static void snb_uncore_msr_exit_box(struct intel_uncore_box *box)
+{
+	if (box->pmu->pmu_idx == 0)
+		wrmsrl(SNB_UNC_PERF_GLOBAL_CTL, 0);
+}
+
 static struct uncore_event_desc snb_uncore_events[] = {
 	INTEL_UNCORE_EVENT_DESC(clockticks, "event=0xff,umask=0x00"),
 	{ /* end: all zeroes */ },
@@ -116,6 +122,7 @@ static struct attribute_group snb_uncore
 
 static struct intel_uncore_ops snb_uncore_msr_ops = {
 	.init_box	= snb_uncore_msr_init_box,
+	.exit_box	= snb_uncore_msr_exit_box,
 	.disable_event	= snb_uncore_msr_disable_event,
 	.enable_event	= snb_uncore_msr_enable_event,
 	.read_counter	= uncore_msr_read_counter,
@@ -231,6 +238,11 @@ static void snb_uncore_imc_init_box(stru
 	box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
 }
 
+static void snb_uncore_imc_exit_box(struct intel_uncore_box *box)
+{
+	iounmap(box->io_addr);
+}
+
 static void snb_uncore_imc_enable_box(struct intel_uncore_box *box)
 {}
 
@@ -458,6 +470,7 @@ static struct pmu snb_uncore_imc_pmu = {
 
 static struct intel_uncore_ops snb_uncore_imc_ops = {
 	.init_box	= snb_uncore_imc_init_box,
+	.exit_box	= snb_uncore_imc_exit_box,
 	.enable_box	= snb_uncore_imc_enable_box,
 	.disable_box	= snb_uncore_imc_disable_box,
 	.disable_event	= snb_uncore_imc_disable_event,