// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023 Igalia S.L.
 */

#include <linux/sched/clock.h>
#include <linux/sysfs.h>

#include "v3d_drv.h"

static ssize_t
gpu_stats_show(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct drm_device *drm = dev_get_drvdata(dev);
        struct v3d_dev *v3d = to_v3d_dev(drm);
        enum v3d_queue queue;
        u64 timestamp = local_clock();
        ssize_t len = 0;

        len += sysfs_emit(buf, "queue\ttimestamp\tjobs\truntime\n");

        for (queue = 0; queue < V3D_MAX_QUEUES; queue++) {
                struct v3d_stats *stats = v3d->queue[queue].stats;
                u64 active_runtime, jobs_completed;

                v3d_get_stats(stats, timestamp, &active_runtime, &jobs_completed);

                /* Each line will display the queue name, timestamp, the number
                 * of jobs sent to that queue and the runtime, as can be seem here:
                 *
                 * queue        timestamp       jobs    runtime
                 * bin          239043069420    22620   17438164056
                 * render       239043069420    22619   27284814161
                 * tfu          239043069420    8763    394592566
                 * csd          239043069420    3168    10787905530
                 * cache_clean  239043069420    6127    237375940
                 */
                len += sysfs_emit_at(buf, len, "%s\t%llu\t%llu\t%llu\n",
                                     v3d_queue_to_string(queue),
                                     timestamp, jobs_completed, active_runtime);
        }

        return len;
}
static DEVICE_ATTR_RO(gpu_stats);

static struct attribute *v3d_sysfs_entries[] = {
        &dev_attr_gpu_stats.attr,
        NULL,
};

static struct attribute_group v3d_sysfs_attr_group = {
        .attrs = v3d_sysfs_entries,
};

int
v3d_sysfs_init(struct device *dev)
{
        return sysfs_create_group(&dev->kobj, &v3d_sysfs_attr_group);
}

void
v3d_sysfs_destroy(struct device *dev)
{
        return sysfs_remove_group(&dev->kobj, &v3d_sysfs_attr_group);
}