1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_device_sysfs.c b/drivers/gpu/drm/xe/xe_device_sysfs.c
new file mode 100644
index 000000000000..99113a5a2b84
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_device_sysfs.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include <linux/kobject.h>
+#include <linux/pci.h>
+#include <linux/sysfs.h>
+
+#include <drm/drm_managed.h>
+
+#include "xe_device.h"
+#include "xe_device_sysfs.h"
+#include "xe_pm.h"
+
+/**
+ * DOC: Xe device sysfs
+ * Xe driver requires exposing certain tunable knobs controlled by user space for
+ * each graphics device. Considering this, we need to add sysfs attributes at device
+ * level granularity.
+ * These sysfs attributes will be available under pci device kobj directory.
+ *
+ * vram_d3cold_threshold - Report/change vram used threshold(in MB) below
+ * which vram save/restore is permissible during runtime D3cold entry/exit.
+ */
+
+static ssize_t
+vram_d3cold_threshold_show(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct xe_device *xe = pdev_to_xe_device(pdev);
+	int ret;
+
+	if (!xe)
+		return -EINVAL;
+
+	ret = sysfs_emit(buf, "%d\n", xe->d3cold.vram_threshold);
+
+	return ret;
+}
+
+static ssize_t
+vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr,
+			    const char *buff, size_t count)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct xe_device *xe = pdev_to_xe_device(pdev);
+	u32 vram_d3cold_threshold;
+	int ret;
+
+	if (!xe)
+		return -EINVAL;
+
+	ret = kstrtou32(buff, 0, &vram_d3cold_threshold);
+	if (ret)
+		return ret;
+
+	drm_dbg(&xe->drm, "vram_d3cold_threshold: %u\n", vram_d3cold_threshold);
+
+	ret = xe_pm_set_vram_threshold(xe, vram_d3cold_threshold);
+
+	return ret ?: count;
+}
+
+static DEVICE_ATTR_RW(vram_d3cold_threshold);
+
+static void xe_device_sysfs_fini(struct drm_device *drm, void *arg)
+{
+	struct xe_device *xe = arg;
+
+	sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
+}
+
+void xe_device_sysfs_init(struct xe_device *xe)
+{
+	struct device *dev = xe->drm.dev;
+	int ret;
+
+	ret = sysfs_create_file(&dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
+	if (ret) {
+		drm_warn(&xe->drm, "Failed to create sysfs file\n");
+		return;
+	}
+
+	ret = drmm_add_action_or_reset(&xe->drm, xe_device_sysfs_fini, xe);
+	if (ret)
+		drm_warn(&xe->drm, "Failed to add sysfs fini drm action\n");
+}