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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2026, NVIDIA CORPORATION.
*/
#include <linux/device.h>
#include <linux/kobject.h>
#include <linux/kstrtox.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <soc/tegra/bpmp.h>
#include <soc/tegra/bpmp-abi.h>
#include "bpmp-private.h"
struct tegra_bpmp_mbwt_attr {
struct kobj_attribute attr;
struct tegra_bpmp_mbwt_sysfs *mbwt;
struct kobject *kobj;
unsigned int instance;
unsigned int vc_type;
};
struct tegra_bpmp_mbwt_sysfs {
struct tegra_bpmp *bpmp;
struct kobject *root;
struct kobject **groups;
struct tegra_bpmp_mbwt_attr *attrs;
unsigned int num_groups;
unsigned int num_attrs;
/* Serializes bandwidth requests to firmware. */
struct mutex lock;
};
static struct tegra_bpmp_mbwt_attr *
tegra_bpmp_mbwt_attr_from_kobj_attr(struct kobj_attribute *attr)
{
return container_of(attr, struct tegra_bpmp_mbwt_attr, attr);
}
static ssize_t tegra_bpmp_mbwt_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct tegra_bpmp_mbwt_attr *mbwt_attr;
struct tegra_bpmp_mbwt_sysfs *mbwt;
unsigned int bandwidth;
int err;
mbwt_attr = tegra_bpmp_mbwt_attr_from_kobj_attr(attr);
mbwt = mbwt_attr->mbwt;
mutex_lock(&mbwt->lock);
err = tegra_bpmp_mbwt_get(mbwt->bpmp, mbwt_attr->instance,
mbwt_attr->vc_type, &bandwidth);
mutex_unlock(&mbwt->lock);
if (err)
return err;
return sysfs_emit(buf, "%u\n", bandwidth);
}
static ssize_t tegra_bpmp_mbwt_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tegra_bpmp_mbwt_attr *mbwt_attr;
struct tegra_bpmp_mbwt_sysfs *mbwt;
unsigned int bandwidth;
int err;
err = kstrtou32(buf, 0, &bandwidth);
if (err)
return err;
mbwt_attr = tegra_bpmp_mbwt_attr_from_kobj_attr(attr);
mbwt = mbwt_attr->mbwt;
mutex_lock(&mbwt->lock);
err = tegra_bpmp_mbwt_set(mbwt->bpmp, mbwt_attr->instance,
mbwt_attr->vc_type, bandwidth);
mutex_unlock(&mbwt->lock);
if (err)
return err;
return count;
}
static void tegra_bpmp_mbwt_sysfs_teardown(void *data)
{
struct tegra_bpmp_mbwt_sysfs *mbwt = data;
unsigned int i;
for (i = 0; i < mbwt->num_attrs; i++) {
sysfs_remove_file(mbwt->attrs[i].kobj,
&mbwt->attrs[i].attr.attr);
kobject_put(mbwt->attrs[i].kobj);
}
for (i = 0; i < mbwt->num_groups; i++)
kobject_put(mbwt->groups[i]);
kobject_put(mbwt->root);
}
static int tegra_bpmp_mbwt_sysfs_add_group(struct tegra_bpmp_mbwt_sysfs *mbwt,
const struct tegra_bpmp_mbwt_group *group)
{
struct tegra_bpmp_mbwt_attr *attr;
struct kobject *group_kobj;
unsigned int i;
int err;
group_kobj = kobject_create_and_add(group->name, mbwt->root);
if (!group_kobj)
return -ENOMEM;
mbwt->groups[mbwt->num_groups++] = group_kobj;
for (i = 0; i < group->num_vcs; i++) {
attr = &mbwt->attrs[mbwt->num_attrs];
attr->kobj = kobject_create_and_add(group->vcs[i].name,
group_kobj);
if (!attr->kobj)
return -ENOMEM;
sysfs_attr_init(&attr->attr.attr);
attr->attr.attr.name = "bandwidth";
attr->attr.attr.mode = 0644;
attr->attr.show = tegra_bpmp_mbwt_show;
attr->attr.store = tegra_bpmp_mbwt_store;
attr->mbwt = mbwt;
attr->instance = group->id;
attr->vc_type = group->vcs[i].type;
err = sysfs_create_file(attr->kobj, &attr->attr.attr);
if (err) {
kobject_put(attr->kobj);
return err;
}
mbwt->num_attrs++;
}
return 0;
}
int tegra_bpmp_init_sysfs(struct tegra_bpmp *bpmp)
{
const struct tegra_bpmp_mbwt_soc *soc = bpmp->soc->mbwt;
struct tegra_bpmp_mbwt_sysfs *mbwt;
unsigned int i, num_attrs = 0;
int err;
if (!soc)
return 0;
if (!tegra_bpmp_mrq_is_supported(bpmp, MRQ_SOCHUB_MBWT))
return 0;
if (!tegra_bpmp_mbwt_cmd_is_supported(bpmp, CMD_SOCHUB_MBWT_GET_BW) ||
!tegra_bpmp_mbwt_cmd_is_supported(bpmp, CMD_SOCHUB_MBWT_SET_BW))
return 0;
mbwt = devm_kzalloc(bpmp->dev, sizeof(*mbwt), GFP_KERNEL);
if (!mbwt)
return -ENOMEM;
mbwt->bpmp = bpmp;
mutex_init(&mbwt->lock);
mbwt->groups = devm_kcalloc(bpmp->dev, soc->num_groups,
sizeof(*mbwt->groups), GFP_KERNEL);
if (!mbwt->groups)
return -ENOMEM;
for (i = 0; i < soc->num_groups; i++)
num_attrs += soc->groups[i].num_vcs;
mbwt->attrs = devm_kcalloc(bpmp->dev, num_attrs,
sizeof(*mbwt->attrs), GFP_KERNEL);
if (!mbwt->attrs)
return -ENOMEM;
mbwt->root = kobject_create_and_add("mbwt", &bpmp->dev->kobj);
if (!mbwt->root)
return -ENOMEM;
for (i = 0; i < soc->num_groups; i++) {
err = tegra_bpmp_mbwt_sysfs_add_group(mbwt, &soc->groups[i]);
if (err)
goto remove_sysfs;
}
err = devm_add_action_or_reset(bpmp->dev,
tegra_bpmp_mbwt_sysfs_teardown, mbwt);
if (err)
return err;
return 0;
remove_sysfs:
tegra_bpmp_mbwt_sysfs_teardown(mbwt);
return err;
}
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