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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2022 Intel Corporation4 */5 6#include <drm/drm_device.h>7#include <linux/device.h>8#include <linux/kobject.h>9#include <linux/printk.h>10#include <linux/sysfs.h>11 12#include "i915_drv.h"13#include "i915_sysfs.h"14#include "intel_gt.h"15#include "intel_gt_print.h"16#include "intel_gt_sysfs.h"17#include "intel_gt_sysfs_pm.h"18#include "intel_gt_types.h"19#include "intel_rc6.h"20 21bool is_object_gt(struct kobject *kobj)22{23 return !strncmp(kobj->name, "gt", 2);24}25 26struct intel_gt *intel_gt_sysfs_get_drvdata(struct kobject *kobj,27 const char *name)28{29 /*30 * We are interested at knowing from where the interface31 * has been called, whether it's called from gt/ or from32 * the parent directory.33 * From the interface position it depends also the value of34 * the private data.35 * If the interface is called from gt/ then private data is36 * of the "struct intel_gt *" type, otherwise it's * a37 * "struct drm_i915_private *" type.38 */39 if (!is_object_gt(kobj)) {40 struct device *dev = kobj_to_dev(kobj);41 struct drm_i915_private *i915 = kdev_minor_to_i915(dev);42 43 return to_gt(i915);44 }45 46 return kobj_to_gt(kobj);47}48 49static struct kobject *gt_get_parent_obj(struct intel_gt *gt)50{51 return >->i915->drm.primary->kdev->kobj;52}53 54static ssize_t id_show(struct kobject *kobj,55 struct kobj_attribute *attr,56 char *buf)57{58 struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);59 60 return sysfs_emit(buf, "%u\n", gt->info.id);61}62static struct kobj_attribute attr_id = __ATTR_RO(id);63 64static struct attribute *id_attrs[] = {65 &attr_id.attr,66 NULL,67};68ATTRIBUTE_GROUPS(id);69 70/* A kobject needs a release() method even if it does nothing */71static void kobj_gt_release(struct kobject *kobj)72{73}74 75static const struct kobj_type kobj_gt_type = {76 .release = kobj_gt_release,77 .sysfs_ops = &kobj_sysfs_ops,78 .default_groups = id_groups,79};80 81void intel_gt_sysfs_register(struct intel_gt *gt)82{83 /*84 * We need to make things right with the85 * ABI compatibility. The files were originally86 * generated under the parent directory.87 *88 * We generate the files only for gt 089 * to avoid duplicates.90 */91 if (gt_is_root(gt))92 intel_gt_sysfs_pm_init(gt, gt_get_parent_obj(gt));93 94 /* init and xfer ownership to sysfs tree */95 if (kobject_init_and_add(>->sysfs_gt, &kobj_gt_type,96 gt->i915->sysfs_gt, "gt%d", gt->info.id))97 goto exit_fail;98 99 gt->sysfs_defaults = kobject_create_and_add(".defaults", >->sysfs_gt);100 if (!gt->sysfs_defaults)101 goto exit_fail;102 103 intel_gt_sysfs_pm_init(gt, >->sysfs_gt);104 105 return;106 107exit_fail:108 kobject_put(>->sysfs_gt);109 gt_warn(gt, "failed to initialize sysfs root\n");110}111 112void intel_gt_sysfs_unregister(struct intel_gt *gt)113{114 kobject_put(gt->sysfs_defaults);115 kobject_put(>->sysfs_gt);116}117