drivers/gpu/drm/v3d/v3d_sysfs.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2023 Igalia S.L.
   4  */
   5
   6 #include <linux/sched/clock.h>
   7 #include <linux/sysfs.h>
   8
   9 #include "v3d_drv.h"
  10
  11 static ssize_t
  12 gpu_stats_show(struct device *dev, struct device_attribute *attr, char *buf)
  13 {
  14         struct drm_device *drm = dev_get_drvdata(dev);
  15         struct v3d_dev *v3d = to_v3d_dev(drm);
  16         enum v3d_queue queue;
  17         u64 timestamp = local_clock();
  18         u64 active_runtime;
  19         ssize_t len = 0;
  20
  21         len += sysfs_emit(buf, "queue\ttimestamp\tjobs\truntime\n");
  22
  23         for (queue = 0; queue < V3D_MAX_QUEUES; queue++) {
  24                 if (v3d->queue[queue].start_ns)
  25                         active_runtime = timestamp - v3d->queue[queue].start_ns;
  26                 else
  27                         active_runtime = 0;
  28
  29                 /* Each line will display the queue name, timestamp, the number
  30                  * of jobs sent to that queue and the runtime, as can be seem here:
  31                  *
  32                  * queue        timestamp       jobs    runtime
  33                  * bin          239043069420    22620   17438164056
  34                  * render       239043069420    22619   27284814161
  35                  * tfu          239043069420    8763    394592566
  36                  * csd          239043069420    3168    10787905530
  37                  * cache_clean  239043069420    6127    237375940
  38                  */
  39                 len += sysfs_emit_at(buf, len, "%s\t%llu\t%llu\t%llu\n",
  40                                      v3d_queue_to_string(queue),
  41                                      timestamp,
  42                                      v3d->queue[queue].jobs_sent,
  43                                      v3d->queue[queue].enabled_ns + active_runtime);
  44         }
  45
  46         return len;
  47 }
  48 static DEVICE_ATTR_RO(gpu_stats);
  49
  50 static struct attribute *v3d_sysfs_entries[] = {
  51         &dev_attr_gpu_stats.attr,
  52         NULL,
  53 };
  54
  55 static struct attribute_group v3d_sysfs_attr_group = {
  56         .attrs = v3d_sysfs_entries,
  57 };
  58
  59 int
  60 v3d_sysfs_init(struct device *dev)
  61 {
  62         return sysfs_create_group(&dev->kobj, &v3d_sysfs_attr_group);
  63 }
  64
  65 void
  66 v3d_sysfs_destroy(struct device *dev)
  67 {
  68         return sysfs_remove_group(&dev->kobj, &v3d_sysfs_attr_group);
  69 }