1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/accel/qaic/qaic_sysfs.c b/drivers/accel/qaic/qaic_sysfs.c
new file mode 100644
index 000000000000..e0afb0ffb589
--- /dev/null
+++ b/drivers/accel/qaic/qaic_sysfs.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/* Copyright (c) 2020-2025, The Linux Foundation. All rights reserved. */
+
+#include <drm/drm_file.h>
+#include <drm/drm_managed.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/kobject.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+
+#include "qaic.h"
+
+#define NAME_LEN		14
+
+struct dbc_attribute {
+	struct device_attribute dev_attr;
+	u32 dbc_id;
+	char name[NAME_LEN];
+};
+
+static ssize_t dbc_state_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+	struct dbc_attribute *dbc_attr = container_of(a, struct dbc_attribute, dev_attr);
+	struct drm_minor *minor = dev_get_drvdata(dev);
+	struct qaic_device *qdev;
+
+	qdev = to_qaic_device(minor->dev);
+	return sysfs_emit(buf, "%d\n", qdev->dbc[dbc_attr->dbc_id].state);
+}
+
+void set_dbc_state(struct qaic_device *qdev, u32 dbc_id, unsigned int state)
+{
+	struct device *kdev = to_accel_kdev(qdev->qddev);
+	char *envp[3] = {};
+	char state_str[16];
+	char id_str[12];
+
+	envp[0] = id_str;
+	envp[1] = state_str;
+
+	if (state >= DBC_STATE_MAX)
+		return;
+	if (dbc_id >= qdev->num_dbc)
+		return;
+	if (state == qdev->dbc[dbc_id].state)
+		return;
+
+	scnprintf(id_str, ARRAY_SIZE(id_str), "DBC_ID=%d", dbc_id);
+	scnprintf(state_str, ARRAY_SIZE(state_str), "DBC_STATE=%d", state);
+
+	qdev->dbc[dbc_id].state = state;
+	kobject_uevent_env(&kdev->kobj, KOBJ_CHANGE, envp);
+}
+
+int qaic_sysfs_init(struct qaic_drm_device *qddev)
+{
+	struct device *kdev = to_accel_kdev(qddev);
+	struct drm_device *drm = to_drm(qddev);
+	u32 num_dbc = qddev->qdev->num_dbc;
+	struct dbc_attribute *dbc_attrs;
+	int i, ret;
+
+	dbc_attrs = drmm_kcalloc(drm, num_dbc, sizeof(*dbc_attrs), GFP_KERNEL);
+	if (!dbc_attrs)
+		return -ENOMEM;
+
+	for (i = 0; i < num_dbc; ++i) {
+		struct dbc_attribute *dbc_attr = &dbc_attrs[i];
+
+		sysfs_attr_init(&dbc_attr->dev_attr.attr);
+		dbc_attr->dbc_id = i;
+		scnprintf(dbc_attr->name, NAME_LEN, "dbc%d_state", i);
+		dbc_attr->dev_attr.attr.name = dbc_attr->name;
+		dbc_attr->dev_attr.attr.mode = 0444;
+		dbc_attr->dev_attr.show = dbc_state_show;
+		ret = sysfs_create_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
+		if (ret) {
+			int j;
+
+			for (j = 0; j < i; ++j) {
+				dbc_attr = &dbc_attrs[j];
+				sysfs_remove_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
+			}
+			drmm_kfree(drm, dbc_attrs);
+			return ret;
+		}
+	}
+
+	qddev->sysfs_attrs = dbc_attrs;
+	return 0;
+}
+
+void qaic_sysfs_remove(struct qaic_drm_device *qddev)
+{
+	struct dbc_attribute *dbc_attrs = qddev->sysfs_attrs;
+	struct device *kdev = to_accel_kdev(qddev);
+	u32 num_dbc = qddev->qdev->num_dbc;
+	int i;
+
+	if (!dbc_attrs)
+		return;
+
+	qddev->sysfs_attrs = NULL;
+	for (i = 0; i < num_dbc; ++i)
+		sysfs_remove_file(&kdev->kobj, &dbc_attrs[i].dev_attr.attr);
+	drmm_kfree(to_drm(qddev), dbc_attrs);
+}