spmi-pmic-arb: add irq tracepoints to the pmic-arb driver

The spmi-pmic-arb is also an interrupt controller. It gets a single aggregate irq and disseminates it to individual pmic-peripheral drivers. Each pmic-peripheral has a unique apid number, and can have multiple interrupt capable functions. The registered apid range shows the lowest and highest apid numbers of pmic-peripheral drivers which request irqs. Pid is the base address of that peripheral. For performance measurement, tracepoints are added at the beginning of the aggregate irq and at the end of the individual pmic-peripheral irqs.

Following is a list showing the new tracepoint events:

spmi_pmic_arb_aggregate_irq_start: aggregate irq number and registered
apid range.

spmi_pmic_arb_apid_irq_end: apid, irq, func_num, sid and pid.

SPMI Interrupts tracepoints can be enabled like:

echo 1 >/sys/kernel/debug/tracing/events/spmi-pmic-arb/enable

and will dump messages that can be viewed in /sys/kernel/debug/tracing/trace that look like:
... spmi_pmic_arb_aggregate_irq_start: irq=150 registered apid range=(3,189)
... spmi_pmic_arb_apid_irq_end: apid=3 irq=1 func_num=0 sid=0 pid=0x8

Suggested-by Sagar Dharia <[email protected]>

Signed-off-by Gilad Avidov <[email protected]>

Signed-off-by Ankit Gupta <[email protected]>

---

 drivers/spmi/spmi-pmic-arb.c         | 13 +++++---
 include/trace/events/spmi-pmic-arb.h | 62
++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 5 deletions(-)
 create mode 100644 include/trace/events/spmi-pmic-arb.h

drivers/spmi/spmi-pmic-arb.c +8 -5

index 20559ab..56100e2 100644
@@ -23,6 +23,9 @@
 #include <linux/slab.h>
 #include <linux/spmi.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/spmi-pmic-arb.h>
+
 /* PMIC Arbiter configuration registers */
 #define PMIC_ARB_VERSION		0x0000
 #define PMIC_ARB_INT_EN			0x0004

@@ -375,16 +378,15 @@ static void periph_interrupt(struct
 spmi_pmic_arb_dev *pa, u8 apid)
 	unsigned int irq;
 	u32 status;
 	int id;
+	u16 ppid = pa->apid_to_ppid[apid];
 
 	status = readl_relaxed(pa->intr + SPMI_PIC_IRQ_STATUS(apid));
 	while (status) {
 		id = ffs(status) - 1;
 		status &= ~(1 << id);
-		irq = irq_find_mapping(pa->domain,
-				       pa->apid_to_ppid[apid] << 16
-				     | id << 8
-				     | apid);
+		irq = irq_find_mapping(pa->domain, ppid << 16 | id << 8 | apid);
 		generic_handle_irq(irq);
+		trace_spmi_pmic_arb_apid_irq_end(apid, irq, id, ppid);
 	}
 }

@@ -399,7 +401,8 @@ static void pmic_arb_chained_irq(unsigned int irq,
 struct irq_desc *desc)
 	int i, id;
 
 	chained_irq_enter(chip, desc);
-
+	trace_spmi_pmic_arb_aggregate_irq_start(irq, pa->min_apid,
+						pa->max_apid);
 	for (i = first; i <= last; ++i) {
 		status = readl_relaxed(intr +

drivers/spmi/spmi-pmic-arb.c +0 -0

 				       SPMI_PIC_OWNER_ACC_STATUS(pa->ee, i));

include/trace/events/spmi-pmic-arb.h new file +62 -1

new file mode 100644
index 0000000..c7fd402
@@ -0,0 +1,62 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM spmi-pmic-arb
+
+#if !defined(_TRACE_SPMI_PMIC_ARB_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SPMI_PMIC_ARB_H
+
+#include <linux/spmi.h>
+#include <linux/tracepoint.h>
+
+/*
+ * drivers/spmi/spmi-pmic-arb.c
+ */
+
+TRACE_EVENT(spmi_pmic_arb_aggregate_irq_start,
+	TP_PROTO(unsigned int irq, u16 first, u16 last),
+	TP_ARGS(irq, first, last),
+
+	TP_STRUCT__entry(
+		__field		( unsigned int,   irq   )
+		__field		( u16,            first )
+		__field		( u16,            last  )
+	),
+
+	TP_fast_assign(
+		__entry->irq    = irq;
+		__entry->first  = first;
+		__entry->last   = last;
+	),
+
+	TP_printk("irq=%d registered apid range=(%d,%d)",
+		  (int)__entry->irq, (int)__entry->first, (int)__entry->last)
+);
+
+TRACE_EVENT(spmi_pmic_arb_apid_irq_end,
+	TP_PROTO(u8 apid, unsigned int irq, u8 func_num, u16 ppid),
+	TP_ARGS(apid, irq, func_num, ppid),
+
+	TP_STRUCT__entry(
+		__field		( u8,           apid     )
+		__field		( unsigned int, irq      )
+		__field		( u8,           func_num )
+		__field		( u8,           sid      )
+		__field		( u8,           pid      )
+	),
+
+	TP_fast_assign(
+		__entry->apid     = apid;
+		__entry->irq      = irq;
+		__entry->func_num = func_num;
+		__entry->sid      = (ppid >> 8) & 0x0F;
+		__entry->pid      = (ppid & 0xFF);
+	),
+
+	TP_printk("apid=%d irq=%d func_num=%d sid=%d pid=0x%d",
+		  (int)__entry->apid, (int)__entry->irq, (int)__entry->func_num,
+		  (int)__entry->sid, (int)__entry->pid)
+);
+
+#endif /* _TRACE_SPMI_PMIC_ARB_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--

1.8.5.2

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Quoted 27 lines

The spmi-pmic-arb is also an interrupt controller. It gets a single aggregate irq and disseminates it to individual pmic-peripheral drivers. Each pmic-peripheral has a unique apid number, and can have multiple interrupt capable functions. The registered apid range shows the lowest and highest apid numbers of pmic-peripheral drivers which request irqs. Pid is the base address of that peripheral. For performance measurement, tracepoints are added at the beginning of the aggregate irq and at the end of the individual pmic-peripheral irqs.

Following is a list showing the new tracepoint events:

spmi_pmic_arb_aggregate_irq_start: aggregate irq number and registered
apid range.

spmi_pmic_arb_apid_irq_end: apid, irq, func_num, sid and pid.

SPMI Interrupts tracepoints can be enabled like:

echo 1 >/sys/kernel/debug/tracing/events/spmi-pmic-arb/enable

and will dump messages that can be viewed in /sys/kernel/debug/tracing/trace that look like:
... spmi_pmic_arb_aggregate_irq_start: irq=150 registered apid range=(3,189)
... spmi_pmic_arb_apid_irq_end: apid=3 irq=1 func_num=0 sid=0 pid=0x8

Quoted 4 lines

Suggested-by Sagar Dharia <[email protected]>

Signed-off-by Gilad Avidov <[email protected]>

Signed-off-by Ankit Gupta <[email protected]>

---

---
Changes since V1:
- pass ppid from driver to evaluate pid and sid in trace file itself.
- type of apid range change from int to u16 as max range can be 512.
- type of func_num change from int to u8, as max it can be 8.
---