[PATCH v2 03/11] coresight: etm4x: Add missing API to set EL match on address filters

Mike Leach
2019-08-29T21:34:23Z

TRCACATRn registers have match bits for secure and non-secure exception
levels which are not accessible by the sysfs API.
This adds a new sysfs parameter to enable this - addr_exlevel_s_ns.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
---
.../coresight/coresight-etm4x-sysfs.c | 42 +++++++++++++++++++
1 file changed, 42 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index cc8156318018..b520f3c1521f 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -1233,6 +1233,47 @@ static ssize_t addr_context_store(struct device *dev,
}
static DEVICE_ATTR_RW(addr_context);

+static ssize_t addr_exlevel_s_ns_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ u8 idx;
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ struct etmv4_config *config = &drvdata->config;
+
+ spin_lock(&drvdata->spinlock);
+ idx = config->addr_idx;
+ val = BMVAL(config->addr_acc[idx], 14, 8);
+ spin_unlock(&drvdata->spinlock);
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t addr_exlevel_s_ns_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ u8 idx;
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ struct etmv4_config *config = &drvdata->config;
+
+ if (kstrtoul(buf, 16, &val))
+ return -EINVAL;
+
+ if (val & ~0x7F)
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ idx = config->addr_idx;
+ /* clear Exlevel_ns & Exlevel_s bits[14:12, 11:8] */
+ config->addr_acc[idx] &= ~(GENMASK(14, 8));
+ config->addr_acc[idx] |= (val << 8);
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(addr_exlevel_s_ns);
+
static ssize_t seq_idx_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -2038,6 +2079,7 @@ static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_addr_stop.attr,
&dev_attr_addr_ctxtype.attr,
&dev_attr_addr_context.attr,
+ &dev_attr_addr_exlevel_s_ns.attr,
&dev_attr_seq_idx.attr,
&dev_attr_seq_state.attr,
&dev_attr_seq_event.attr,
--
2.17.1