drivers/gpu/drm/vc4/vc4_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright © 2014 Broadcom
   4  */
   5
   6 #include <linux/seq_file.h>
   7 #include <linux/circ_buf.h>
   8 #include <linux/ctype.h>
   9 #include <linux/debugfs.h>
  10
  11 #include "vc4_drv.h"
  12 #include "vc4_regs.h"
  13
  14 struct vc4_debugfs_info_entry {
  15         struct list_head link;
  16         struct drm_info_list info;
  17 };
  18
  19 /**
  20  * Called at drm_dev_register() time on each of the minors registered
  21  * by the DRM device, to attach the debugfs files.
  22  */
  23 int
  24 vc4_debugfs_init(struct drm_minor *minor)
  25 {
  26         struct vc4_dev *vc4 = to_vc4_dev(minor->dev);
  27         struct vc4_debugfs_info_entry *entry;
  28
  29         debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
  30                             minor->debugfs_root, &vc4->load_tracker_enabled);
  31
  32         list_for_each_entry(entry, &vc4->debugfs_list, link) {
  33                 int ret = drm_debugfs_create_files(&entry->info, 1,
  34                                                    minor->debugfs_root, minor);
  35
  36                 if (ret)
  37                         return ret;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static int vc4_debugfs_regset32(struct seq_file *m, void *unused)
  44 {
  45         struct drm_info_node *node = (struct drm_info_node *)m->private;
  46         struct debugfs_regset32 *regset = node->info_ent->data;
  47         struct drm_printer p = drm_seq_file_printer(m);
  48
  49         drm_print_regset32(&p, regset);
  50
  51         return 0;
  52 }
  53
  54 /**
  55  * Registers a debugfs file with a callback function for a vc4 component.
  56  *
  57  * This is like drm_debugfs_create_files(), but that can only be
  58  * called a given DRM minor, while the various VC4 components want to
  59  * register their debugfs files during the component bind process.  We
  60  * track the request and delay it to be called on each minor during
  61  * vc4_debugfs_init().
  62  */
  63 void vc4_debugfs_add_file(struct drm_device *dev,
  64                           const char *name,
  65                           int (*show)(struct seq_file*, void*),
  66                           void *data)
  67 {
  68         struct vc4_dev *vc4 = to_vc4_dev(dev);
  69
  70         struct vc4_debugfs_info_entry *entry =
  71                 devm_kzalloc(dev->dev, sizeof(*entry), GFP_KERNEL);
  72
  73         if (!entry)
  74                 return;
  75
  76         entry->info.name = name;
  77         entry->info.show = show;
  78         entry->info.data = data;
  79
  80         list_add(&entry->link, &vc4->debugfs_list);
  81 }
  82
  83 void vc4_debugfs_add_regset32(struct drm_device *drm,
  84                               const char *name,
  85                               struct debugfs_regset32 *regset)
  86 {
  87         vc4_debugfs_add_file(drm, name, vc4_debugfs_regset32, regset);
  88 }