1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of
the max value). It's visible only on platforms that support
the capability.
+
+What: /sys/bus/dsa/devices/group<m>.<n>/batch_progress_limit
+Date: Sept 14, 2022
+KernelVersion: 6.0.0
+Contact: dmaengine@vger.kernel.org
+Description: Allows control of the number of batch descriptors that can be
+ concurrently processed by an engine in the group as a fraction
+ of the Maximum Batch Descriptors in Progress value specified in
+ the ENGCAP register. The acceptable values are 0 (default),
+ 1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of
+ the max value). It's visible only on platforms that support
+ the capability.
__ATTR(desc_progress_limit, 0644, group_desc_progress_limit_show,
group_desc_progress_limit_store);
+static ssize_t group_batch_progress_limit_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct idxd_group *group = confdev_to_group(dev);
+
+ return sysfs_emit(buf, "%d\n", group->batch_progress_limit);
+}
+
+static ssize_t group_batch_progress_limit_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct idxd_group *group = confdev_to_group(dev);
+ int val, rc;
+
+ rc = kstrtoint(buf, 10, &val);
+ if (rc < 0)
+ return -EINVAL;
+
+ if (val & ~GENMASK(1, 0))
+ return -EINVAL;
+
+ group->batch_progress_limit = val;
+ return count;
+}
+
+static struct device_attribute dev_attr_group_batch_progress_limit =
+ __ATTR(batch_progress_limit, 0644, group_batch_progress_limit_show,
+ group_batch_progress_limit_store);
static struct attribute *idxd_group_attributes[] = {
&dev_attr_group_work_queues.attr,
&dev_attr_group_engines.attr,
&dev_attr_group_traffic_class_a.attr,
&dev_attr_group_traffic_class_b.attr,
&dev_attr_group_desc_progress_limit.attr,
+ &dev_attr_group_batch_progress_limit.attr,
NULL,
};
static bool idxd_group_attr_progress_limit_invisible(struct attribute *attr,
struct idxd_device *idxd)
{
- return attr == &dev_attr_group_desc_progress_limit.attr &&
- !idxd->hw.group_cap.progress_limit;
+ return (attr == &dev_attr_group_desc_progress_limit.attr ||
+ attr == &dev_attr_group_batch_progress_limit.attr) &&
+ !idxd->hw.group_cap.progress_limit;
}
static umode_t idxd_group_attr_visible(struct kobject *kobj,