On Mon, Aug 19, 2019 at 09:57:15PM +0100, 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.
Signed-off-by: Mike Leach mike.leach@linaro.org
.../coresight/coresight-etm4x-sysfs.c | 39 +++++++++++++++++++ 1 file changed, 39 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c index fa1d6a938f6c..7eab5d7d0b62 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -1233,6 +1233,44 @@ 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;- 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);
I think it needs to check if 'val' is out of bound, which only can have value which is less than 7 bits (finally set for bit 8 to bit 14).
Just curious, if the CPU runs in non-secure mode (e.g. NS-EL1 in kernel mode), does it have permission to access EXLEVEL_S field? I don't see the spec give info for this.
Thanks, Leo Yan
- 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 +2076,7 @@ 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
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