[PATCH v2 2/2] ARM: imx: Add AXI address filter support for MMDC profiling

From: andrei-tiberiu.breana
Date: Wed Feb 15 2017 - 07:01:14 EST


From: Tiberiu Breana <andrei-tiberiu.breana@xxxxxxx>

Add support for an extra config parameter for perf commands:
axi_id, which will be written in the MMDC's MADPCR1 register,
to filter memory usage profiling (see i.MX6 reference manual,
chapter 44.7 MMDC Profiling for AXI id usage).

Signed-off-by: Tiberiu Breana <andrei-tiberiu.breana@xxxxxxx>
---
arch/arm/mach-imx/mmdc.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
index 89a926f..7826289 100644
--- a/arch/arm/mach-imx/mmdc.c
+++ b/arch/arm/mach-imx/mmdc.c
@@ -1,4 +1,5 @@
/*
+ * Copyright 2017 NXP
* Copyright 2011,2016 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
@@ -47,6 +48,7 @@
#define PROFILE_SEL 0x10

#define MMDC_MADPCR0 0x410
+#define MMDC_MADPCR1 0x414
#define MMDC_MADPSR0 0x418
#define MMDC_MADPSR1 0x41C
#define MMDC_MADPSR2 0x420
@@ -57,6 +59,7 @@
#define MMDC_NUM_COUNTERS 6

#define MMDC_FLAG_PROFILE_SEL 0x1
+#define MMDC_PRF_AXI_ID_CLEAR 0x0

#define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)

@@ -161,8 +164,11 @@ static struct attribute_group mmdc_pmu_events_attr_group = {
};

PMU_FORMAT_ATTR(event, "config:0-63");
+PMU_FORMAT_ATTR(axi_id, "config1:0-63");
+
static struct attribute *mmdc_pmu_format_attrs[] = {
&format_attr_event.attr,
+ &format_attr_axi_id.attr,
NULL,
};

@@ -345,6 +351,14 @@ static void mmdc_pmu_event_start(struct perf_event *event, int flags)

writel(DBG_RST, reg);

+ /*
+ * Write the AXI id parameter to MADPCR1.
+ */
+ val = event->attr.config1;
+ reg = mmdc_base + MMDC_MADPCR1;
+ writel(val, reg);
+
+ reg = mmdc_base + MMDC_MADPCR0;
val = DBG_EN;
if (pmu_mmdc->devtype_data->flags & MMDC_FLAG_PROFILE_SEL)
val |= PROFILE_SEL;
@@ -382,6 +396,10 @@ static void mmdc_pmu_event_stop(struct perf_event *event, int flags)
reg = mmdc_base + MMDC_MADPCR0;

writel(PRF_FRZ, reg);
+
+ reg = mmdc_base + MMDC_MADPCR1;
+ writel(MMDC_PRF_AXI_ID_CLEAR, reg);
+
mmdc_pmu_event_update(event);
}

--
2.7.4