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// 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);
}
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