Thread (26 messages) 26 messages, 5 authors, 2019-10-30

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

From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: 2019-09-17 09:31:48
Also in: linux-doc

Hi Mike,

On 29/08/2019 22:33, Mike Leach wrote:
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.
Looks good to me. Some minor nits below.
quoted hunk ↗ jump to hunk
Signed-off-by: Mike Leach <redacted>
---
  .../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;
Can this be 0 instead of 16 to accept any base ?
+
+	if (val & ~0x7F)
minor nit: Do we need to use (GENMASK(14, 8) >> 8)  here instead of
hard coding the mask ?
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	idx = config->addr_idx;
+	/* clear Exlevel_ns & Exlevel_s bits[14:12, 11:8] */
It may be worth adding a comment that bit[15] is RES0.
quoted hunk ↗ jump to hunk
+	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,

Either ways, irrespective of the above comments :

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

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