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// 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");
}
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