[PATCH V4 8/8] perf/x86/intel/uncore: clean up client IMC uncore

[kan . liang]

From: Kan Liang <Kan.liang@xxxxxxxxx>

The counters in client IMC uncore are free running counters, not fixed
counters. It should be corrected. The new infrastructure for free
running counter should be applied.

Introduce free running counter type SNB_PCI_UNCORE_IMC_DATA for data
read and data write counters.

Keep the custom event_init() function compatible with old event
encoding.

Clean up other custom event_* functions.

Signed-off-by: Kan Liang <Kan.liang@xxxxxxxxx>
---

No changes since V3

 arch/x86/events/intel/uncore_snb.c | 132 ++++++-------------------------------
 1 file changed, 20 insertions(+), 112 deletions(-)

diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index b6d0d72..29473e9 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -284,6 +284,15 @@ static struct uncore_event_desc snb_uncore_imc_events[] = {
 #define SNB_UNCORE_PCI_IMC_DATA_WRITES_BASE	0x5054
 #define SNB_UNCORE_PCI_IMC_CTR_BASE		SNB_UNCORE_PCI_IMC_DATA_READS_BASE
 
+enum perf_snb_uncore_imc_freerunning_types {
+	SNB_PCI_UNCORE_IMC_DATA		= 0,
+	SNB_PCI_UNCORE_IMC_FREERUNNING_TYPE_MAX,
+};
+
+static struct freerunning_counters snb_uncore_imc_freerunning[] = {
+	[SNB_PCI_UNCORE_IMC_DATA]     = { SNB_UNCORE_PCI_IMC_DATA_READS_BASE, 0x4, 0x0, 2, 32 },
+};
+
 static struct attribute *snb_uncore_imc_formats_attr[] = {
 	&format_attr_event.attr,
 	NULL,
@@ -340,9 +349,8 @@ static u64 snb_uncore_imc_read_counter(struct intel_uncore_box *box, struct perf
 }
 
 /*
- * custom event_init() function because we define our own fixed, free
- * running counters, so we do not want to conflict with generic uncore
- * logic. Also simplifies processing
+ * Keep the custom event_init() function compatible with old event
+ * encoding for free running counters.
  */
 static int snb_uncore_imc_event_init(struct perf_event *event)
 {
@@ -404,11 +412,11 @@ static int snb_uncore_imc_event_init(struct perf_event *event)
 	switch (cfg) {
 	case SNB_UNCORE_PCI_IMC_DATA_READS:
 		base = SNB_UNCORE_PCI_IMC_DATA_READS_BASE;
-		idx = UNCORE_PMC_IDX_FIXED;
+		idx = UNCORE_PMC_IDX_FREERUNNING;
 		break;
 	case SNB_UNCORE_PCI_IMC_DATA_WRITES:
 		base = SNB_UNCORE_PCI_IMC_DATA_WRITES_BASE;
-		idx = UNCORE_PMC_IDX_FIXED + 1;
+		idx = UNCORE_PMC_IDX_FREERUNNING;
 		break;
 	default:
 		return -EINVAL;
@@ -429,104 +437,6 @@ static int snb_uncore_imc_hw_config(struct intel_uncore_box *box, struct perf_ev
 	return 0;
 }
 
-static void snb_uncore_imc_event_start(struct perf_event *event, int flags)
-{
-	struct intel_uncore_box *box = uncore_event_to_box(event);
-	u64 count;
-
-	if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))
-		return;
-
-	event->hw.state = 0;
-	box->n_active++;
-
-	list_add_tail(&event->active_entry, &box->active_list);
-
-	count = snb_uncore_imc_read_counter(box, event);
-	local64_set(&event->hw.prev_count, count);
-
-	if (box->n_active == 1)
-		uncore_pmu_start_hrtimer(box);
-}
-
-static void snb_uncore_imc_event_read(struct perf_event *event)
-{
-	struct intel_uncore_box *box = uncore_event_to_box(event);
-	u64 prev_count, new_count, delta;
-	int shift;
-
-	/*
-	 * There are two free running counters in IMC.
-	 * The index for the second one is hardcoded to
-	 * UNCORE_PMC_IDX_FIXED + 1.
-	 */
-	if (event->hw.idx >= UNCORE_PMC_IDX_FIXED)
-		shift = 64 - uncore_fixed_ctr_bits(box);
-	else
-		shift = 64 - uncore_perf_ctr_bits(box);
-
-	/* the hrtimer might modify the previous event value */
-again:
-	prev_count = local64_read(&event->hw.prev_count);
-	new_count = uncore_read_counter(box, event);
-	if (local64_xchg(&event->hw.prev_count, new_count) != prev_count)
-		goto again;
-
-	delta = (new_count << shift) - (prev_count << shift);
-	delta >>= shift;
-
-	local64_add(delta, &event->count);
-}
-
-static void snb_uncore_imc_event_stop(struct perf_event *event, int flags)
-{
-	struct intel_uncore_box *box = uncore_event_to_box(event);
-	struct hw_perf_event *hwc = &event->hw;
-
-	if (!(hwc->state & PERF_HES_STOPPED)) {
-		box->n_active--;
-
-		WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
-		hwc->state |= PERF_HES_STOPPED;
-
-		list_del(&event->active_entry);
-
-		if (box->n_active == 0)
-			uncore_pmu_cancel_hrtimer(box);
-	}
-
-	if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
-		/*
-		 * Drain the remaining delta count out of a event
-		 * that we are disabling:
-		 */
-		snb_uncore_imc_event_read(event);
-		hwc->state |= PERF_HES_UPTODATE;
-	}
-}
-
-static int snb_uncore_imc_event_add(struct perf_event *event, int flags)
-{
-	struct intel_uncore_box *box = uncore_event_to_box(event);
-	struct hw_perf_event *hwc = &event->hw;
-
-	if (!box)
-		return -ENODEV;
-
-	hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
-	if (!(flags & PERF_EF_START))
-		hwc->state |= PERF_HES_ARCH;
-
-	snb_uncore_imc_event_start(event, 0);
-
-	return 0;
-}
-
-static void snb_uncore_imc_event_del(struct perf_event *event, int flags)
-{
-	snb_uncore_imc_event_stop(event, PERF_EF_UPDATE);
-}
-
 int snb_pci2phy_map_init(int devid)
 {
 	struct pci_dev *dev = NULL;
@@ -558,11 +468,11 @@ int snb_pci2phy_map_init(int devid)
 static struct pmu snb_uncore_imc_pmu = {
 	.task_ctx_nr	= perf_invalid_context,
 	.event_init	= snb_uncore_imc_event_init,
-	.add		= snb_uncore_imc_event_add,
-	.del		= snb_uncore_imc_event_del,
-	.start		= snb_uncore_imc_event_start,
-	.stop		= snb_uncore_imc_event_stop,
-	.read		= snb_uncore_imc_event_read,
+	.add		= uncore_pmu_event_add,
+	.del		= uncore_pmu_event_del,
+	.start		= uncore_pmu_event_start,
+	.stop		= uncore_pmu_event_stop,
+	.read		= uncore_pmu_event_read,
 };
 
 static struct intel_uncore_ops snb_uncore_imc_ops = {
@@ -580,12 +490,10 @@ static struct intel_uncore_type snb_uncore_imc = {
 	.name		= "imc",
 	.num_counters   = 2,
 	.num_boxes	= 1,
-	.fixed_ctr_bits	= 32,
-	.fixed_ctr	= SNB_UNCORE_PCI_IMC_CTR_BASE,
+	.num_freerunning_types	= SNB_PCI_UNCORE_IMC_FREERUNNING_TYPE_MAX,
+	.freerunning	= snb_uncore_imc_freerunning,
 	.event_descs	= snb_uncore_imc_events,
 	.format_group	= &snb_uncore_imc_format_group,
-	.perf_ctr	= SNB_UNCORE_PCI_IMC_DATA_READS_BASE,
-	.event_mask	= SNB_UNCORE_PCI_IMC_EVENT_MASK,
 	.ops		= &snb_uncore_imc_ops,
 	.pmu		= &snb_uncore_imc_pmu,
 };
-- 
2.7.4