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// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 Intel Corporation
*/
#include <drm/drm_device.h>
#include <linux/device.h>
#include <linux/kobject.h>
#include <linux/printk.h>
#include <linux/sysfs.h>
#include "i915_drv.h"
#include "i915_sysfs.h"
#include "intel_gt.h"
#include "intel_gt_sysfs.h"
#include "intel_gt_sysfs_pm.h"
#include "intel_gt_types.h"
#include "intel_rc6.h"
bool is_object_gt(struct kobject *kobj)
{
return !strncmp(kobj->name, "gt", 2);
}
static struct intel_gt *kobj_to_gt(struct kobject *kobj)
{
return container_of(kobj, struct kobj_gt, base)->gt;
}
struct intel_gt *intel_gt_sysfs_get_drvdata(struct device *dev,
const char *name)
{
struct kobject *kobj = &dev->kobj;
/*
* We are interested at knowing from where the interface
* has been called, whether it's called from gt/ or from
* the parent directory.
* From the interface position it depends also the value of
* the private data.
* If the interface is called from gt/ then private data is
* of the "struct intel_gt *" type, otherwise it's * a
* "struct drm_i915_private *" type.
*/
if (!is_object_gt(kobj)) {
struct drm_i915_private *i915 = kdev_minor_to_i915(dev);
return to_gt(i915);
}
return kobj_to_gt(kobj);
}
static struct kobject *gt_get_parent_obj(struct intel_gt *gt)
{
return >->i915->drm.primary->kdev->kobj;
}
static ssize_t id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct intel_gt *gt = intel_gt_sysfs_get_drvdata(dev, attr->attr.name);
return sysfs_emit(buf, "%u\n", gt->info.id);
}
static DEVICE_ATTR_RO(id);
static struct attribute *id_attrs[] = {
&dev_attr_id.attr,
NULL,
};
ATTRIBUTE_GROUPS(id);
static void kobj_gt_release(struct kobject *kobj)
{
kfree(kobj);
}
static struct kobj_type kobj_gt_type = {
.release = kobj_gt_release,
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = id_groups,
};
void intel_gt_sysfs_register(struct intel_gt *gt)
{
struct kobj_gt *kg;
/*
* We need to make things right with the
* ABI compatibility. The files were originally
* generated under the parent directory.
*
* We generate the files only for gt 0
* to avoid duplicates.
*/
if (gt_is_root(gt))
intel_gt_sysfs_pm_init(gt, gt_get_parent_obj(gt));
kg = kzalloc(sizeof(*kg), GFP_KERNEL);
if (!kg)
goto exit_fail;
kobject_init(&kg->base, &kobj_gt_type);
kg->gt = gt;
/* xfer ownership to sysfs tree */
if (kobject_add(&kg->base, gt->i915->sysfs_gt, "gt%d", gt->info.id))
goto exit_kobj_put;
intel_gt_sysfs_pm_init(gt, &kg->base);
return;
exit_kobj_put:
kobject_put(&kg->base);
exit_fail:
drm_warn(>->i915->drm,
"failed to initialize gt%d sysfs root\n", gt->info.id);
}
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