[PATCH v4 12/13] coresight-etm4x: Read only access to the main management registers
From: Mathieu Poirier
Date: Wed May 13 2015 - 12:36:31 EST
Having access to the ETMv4 management registers is very useful as they
give meaningful information on how the IP block has been configured at
synthesis time.
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
---
.../ABI/testing/sysfs-bus-coresight-devices-etm4x | 77 ++++++++++++++++++++++
drivers/hwtracing/coresight/coresight-etm4x.c | 53 ++++++++++++++-
2 files changed, 129 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
index 648f28ded226..bde788dfd3f7 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
@@ -281,3 +281,80 @@ KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Description: (RW) Mask for all 8 virtual machine ID comparator value
registers (if implemented).
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcoslsr
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the OS Lock Status Register (0x304).
+ The value it taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdcr
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Power Down Control Register
+ (0x310). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdsr
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Power Down Status Register
+ (0x314). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trclsr
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the SW Lock Status Register
+ (0xFB4). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcauthstatus
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Authentication Status Register
+ (0xFB8). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevid
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Device ID Register
+ (0xFC8). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevtype
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Device Type Register
+ (0xFCC). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr0
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Peripheral ID0 Register
+ (0xFE0). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr1
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Peripheral ID1 Register
+ (0xFE4). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr2
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Peripheral ID2 Register
+ (0xFE8). The value is taken directly from the HW.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr3
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
+Description: (R) Print the content of the Peripheral ID3 Register
+ (0xFEC). The value is taken directly from the HW.
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 02ee6fc97ddf..0568e4413411 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -2200,7 +2200,58 @@ static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_cpu.attr,
NULL,
};
-ATTRIBUTE_GROUPS(coresight_etmv4);
+
+#define coresight_simple_func(name, offset) \
+static ssize_t name##_show(struct device *_dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(_dev->parent); \
+ return scnprintf(buf, PAGE_SIZE, "0x%x\n", \
+ readl_relaxed(drvdata->base + offset)); \
+} \
+DEVICE_ATTR_RO(name)
+
+coresight_simple_func(trcoslsr, TRCOSLSR);
+coresight_simple_func(trcpdcr, TRCPDCR);
+coresight_simple_func(trcpdsr, TRCPDSR);
+coresight_simple_func(trclsr, TRCLSR);
+coresight_simple_func(trcauthstatus, TRCAUTHSTATUS);
+coresight_simple_func(trcdevid, TRCDEVID);
+coresight_simple_func(trcdevtype, TRCDEVTYPE);
+coresight_simple_func(trcpidr0, TRCPIDR0);
+coresight_simple_func(trcpidr1, TRCPIDR1);
+coresight_simple_func(trcpidr2, TRCPIDR2);
+coresight_simple_func(trcpidr3, TRCPIDR3);
+
+static struct attribute *coresight_etmv4_mgmt_attrs[] = {
+ &dev_attr_trcoslsr.attr,
+ &dev_attr_trcpdcr.attr,
+ &dev_attr_trcpdsr.attr,
+ &dev_attr_trclsr.attr,
+ &dev_attr_trcauthstatus.attr,
+ &dev_attr_trcdevid.attr,
+ &dev_attr_trcdevtype.attr,
+ &dev_attr_trcpidr0.attr,
+ &dev_attr_trcpidr1.attr,
+ &dev_attr_trcpidr2.attr,
+ &dev_attr_trcpidr3.attr,
+ NULL,
+};
+
+static const struct attribute_group coresight_etmv4_group = {
+ .attrs = coresight_etmv4_attrs,
+};
+
+static const struct attribute_group coresight_etmv4_mgmt_group = {
+ .attrs = coresight_etmv4_mgmt_attrs,
+ .name = "mgmt",
+};
+
+static const struct attribute_group *coresight_etmv4_groups[] = {
+ &coresight_etmv4_group,
+ &coresight_etmv4_mgmt_group,
+ NULL,
+};
static void etm4_init_arch_data(void *info)
{
--
1.9.1
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