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coresight-etm4x: Controls pertaining to the ViewInst register

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Adding sysfs entries to control the ViewInst register's event
selector along with secure and non-secure exception level
instruction tracing.

Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pratik Patel 2015-05-13 10:34:13 -06:00 committed by Greg Kroah-Hartman
parent b460daf87b
commit 43ba6a7b00
2 changed files with 118 additions and 0 deletions
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20
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
View file

@ -134,3 +134,23 @@ KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls which regions in the memory map are enabled to
use branch broadcasting.
What: /sys/bus/coresight/devices/<memory_map>.etm/event_vinst
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls instruction trace filtering.
What: /sys/bus/coresight/devices/<memory_map>.etm/s_exlevel_vinst
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) In Secure state, each bit controls whether instruction
tracing is enabled for the corresponding exception level.
What: /sys/bus/coresight/devices/<memory_map>.etm/ns_exlevel_vinst
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) In non-secure state, each bit controls whether instruction
tracing is enabled for the corresponding exception level.

98
drivers/hwtracing/coresight/coresight-etm4x.c
View file

@ -932,6 +932,101 @@ static ssize_t bb_ctrl_store(struct device *dev,
}
static DEVICE_ATTR_RW(bb_ctrl);
static ssize_t event_vinst_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
unsigned long val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
val = drvdata->vinst_ctrl & ETMv4_EVENT_MASK;
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t event_vinst_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
unsigned long val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
if (kstrtoul(buf, 16, &val))
return -EINVAL;
spin_lock(&drvdata->spinlock);
val &= ETMv4_EVENT_MASK;
drvdata->vinst_ctrl &= ~ETMv4_EVENT_MASK;
drvdata->vinst_ctrl |= val;
spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(event_vinst);
static ssize_t s_exlevel_vinst_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
unsigned long val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
val = BMVAL(drvdata->vinst_ctrl, 16, 19);
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t s_exlevel_vinst_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
unsigned long val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
if (kstrtoul(buf, 16, &val))
return -EINVAL;
spin_lock(&drvdata->spinlock);
/* clear all EXLEVEL_S bits (bit[18] is never implemented) */
drvdata->vinst_ctrl &= ~(BIT(16) | BIT(17) | BIT(19));
/* enable instruction tracing for corresponding exception level */
val &= drvdata->s_ex_level;
drvdata->vinst_ctrl |= (val << 16);
spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(s_exlevel_vinst);
static ssize_t ns_exlevel_vinst_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
unsigned long val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
/* EXLEVEL_NS, bits[23:20] */
val = BMVAL(drvdata->vinst_ctrl, 20, 23);
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t ns_exlevel_vinst_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
unsigned long val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
if (kstrtoul(buf, 16, &val))
return -EINVAL;
spin_lock(&drvdata->spinlock);
/* clear EXLEVEL_NS bits (bit[23] is never implemented */
drvdata->vinst_ctrl &= ~(BIT(20) | BIT(21) | BIT(22));
/* enable instruction tracing for corresponding exception level */
val &= drvdata->ns_ex_level;
drvdata->vinst_ctrl |= (val << 20);
spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(ns_exlevel_vinst);
static ssize_t cpu_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -963,6 +1058,9 @@ static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_syncfreq.attr,
&dev_attr_cyc_threshold.attr,
&dev_attr_bb_ctrl.attr,
&dev_attr_event_vinst.attr,
&dev_attr_s_exlevel_vinst.attr,
&dev_attr_ns_exlevel_vinst.attr,
&dev_attr_cpu.attr,
NULL,
};