v4.19.13 snapshot.
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
new file mode 100644
index 0000000..373bd4c
--- /dev/null
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -0,0 +1,429 @@
+/*
+ * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
+ *
+ * Copyright 2008 Ben Gamari <bgamari@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <drm/drm_client.h>
+#include <drm/drm_debugfs.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_atomic.h>
+#include <drm/drmP.h>
+
+#include "drm_internal.h"
+#include "drm_crtc_internal.h"
+
+#if defined(CONFIG_DEBUG_FS)
+
+/***************************************************
+ * Initialization, etc.
+ **************************************************/
+
+static const struct drm_info_list drm_debugfs_list[] = {
+ {"name", drm_name_info, 0},
+ {"clients", drm_clients_info, 0},
+ {"gem_names", drm_gem_name_info, DRIVER_GEM},
+};
+#define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
+
+
+static int drm_debugfs_open(struct inode *inode, struct file *file)
+{
+ struct drm_info_node *node = inode->i_private;
+
+ return single_open(file, node->info_ent->show, node);
+}
+
+
+static const struct file_operations drm_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = drm_debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+
+/**
+ * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
+ * minor
+ * @files: The array of files to create
+ * @count: The number of files given
+ * @root: DRI debugfs dir entry.
+ * @minor: device minor number
+ *
+ * Create a given set of debugfs files represented by an array of
+ * &struct drm_info_list in the given root directory. These files will be removed
+ * automatically on drm_debugfs_cleanup().
+ */
+int drm_debugfs_create_files(const struct drm_info_list *files, int count,
+ struct dentry *root, struct drm_minor *minor)
+{
+ struct drm_device *dev = minor->dev;
+ struct dentry *ent;
+ struct drm_info_node *tmp;
+ int i, ret;
+
+ for (i = 0; i < count; i++) {
+ u32 features = files[i].driver_features;
+
+ if (features != 0 &&
+ (dev->driver->driver_features & features) != features)
+ continue;
+
+ tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
+ if (tmp == NULL) {
+ ret = -1;
+ goto fail;
+ }
+ ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
+ root, tmp, &drm_debugfs_fops);
+ if (!ent) {
+ DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
+ root, files[i].name);
+ kfree(tmp);
+ ret = -1;
+ goto fail;
+ }
+
+ tmp->minor = minor;
+ tmp->dent = ent;
+ tmp->info_ent = &files[i];
+
+ mutex_lock(&minor->debugfs_lock);
+ list_add(&tmp->list, &minor->debugfs_list);
+ mutex_unlock(&minor->debugfs_lock);
+ }
+ return 0;
+
+fail:
+ drm_debugfs_remove_files(files, count, minor);
+ return ret;
+}
+EXPORT_SYMBOL(drm_debugfs_create_files);
+
+int drm_debugfs_init(struct drm_minor *minor, int minor_id,
+ struct dentry *root)
+{
+ struct drm_device *dev = minor->dev;
+ char name[64];
+ int ret;
+
+ INIT_LIST_HEAD(&minor->debugfs_list);
+ mutex_init(&minor->debugfs_lock);
+ sprintf(name, "%d", minor_id);
+ minor->debugfs_root = debugfs_create_dir(name, root);
+ if (!minor->debugfs_root) {
+ DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
+ return -1;
+ }
+
+ ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
+ minor->debugfs_root, minor);
+ if (ret) {
+ debugfs_remove(minor->debugfs_root);
+ minor->debugfs_root = NULL;
+ DRM_ERROR("Failed to create core drm debugfs files\n");
+ return ret;
+ }
+
+ if (drm_drv_uses_atomic_modeset(dev)) {
+ ret = drm_atomic_debugfs_init(minor);
+ if (ret) {
+ DRM_ERROR("Failed to create atomic debugfs files\n");
+ return ret;
+ }
+ }
+
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ ret = drm_framebuffer_debugfs_init(minor);
+ if (ret) {
+ DRM_ERROR("Failed to create framebuffer debugfs file\n");
+ return ret;
+ }
+
+ ret = drm_client_debugfs_init(minor);
+ if (ret) {
+ DRM_ERROR("Failed to create client debugfs file\n");
+ return ret;
+ }
+ }
+
+ if (dev->driver->debugfs_init) {
+ ret = dev->driver->debugfs_init(minor);
+ if (ret) {
+ DRM_ERROR("DRM: Driver failed to initialize "
+ "/sys/kernel/debug/dri.\n");
+ return ret;
+ }
+ }
+ return 0;
+}
+
+
+int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
+ struct drm_minor *minor)
+{
+ struct list_head *pos, *q;
+ struct drm_info_node *tmp;
+ int i;
+
+ mutex_lock(&minor->debugfs_lock);
+ for (i = 0; i < count; i++) {
+ list_for_each_safe(pos, q, &minor->debugfs_list) {
+ tmp = list_entry(pos, struct drm_info_node, list);
+ if (tmp->info_ent == &files[i]) {
+ debugfs_remove(tmp->dent);
+ list_del(pos);
+ kfree(tmp);
+ }
+ }
+ }
+ mutex_unlock(&minor->debugfs_lock);
+ return 0;
+}
+EXPORT_SYMBOL(drm_debugfs_remove_files);
+
+static void drm_debugfs_remove_all_files(struct drm_minor *minor)
+{
+ struct drm_info_node *node, *tmp;
+
+ mutex_lock(&minor->debugfs_lock);
+ list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
+ debugfs_remove(node->dent);
+ list_del(&node->list);
+ kfree(node);
+ }
+ mutex_unlock(&minor->debugfs_lock);
+}
+
+int drm_debugfs_cleanup(struct drm_minor *minor)
+{
+ if (!minor->debugfs_root)
+ return 0;
+
+ drm_debugfs_remove_all_files(minor);
+
+ debugfs_remove_recursive(minor->debugfs_root);
+ minor->debugfs_root = NULL;
+
+ return 0;
+}
+
+static int connector_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+
+ seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
+
+ return 0;
+}
+
+static int connector_open(struct inode *inode, struct file *file)
+{
+ struct drm_connector *dev = inode->i_private;
+
+ return single_open(file, connector_show, dev);
+}
+
+static ssize_t connector_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ struct seq_file *m = file->private_data;
+ struct drm_connector *connector = m->private;
+ char buf[12];
+
+ if (len > sizeof(buf) - 1)
+ return -EINVAL;
+
+ if (copy_from_user(buf, ubuf, len))
+ return -EFAULT;
+
+ buf[len] = '\0';
+
+ if (!strcmp(buf, "on"))
+ connector->force = DRM_FORCE_ON;
+ else if (!strcmp(buf, "digital"))
+ connector->force = DRM_FORCE_ON_DIGITAL;
+ else if (!strcmp(buf, "off"))
+ connector->force = DRM_FORCE_OFF;
+ else if (!strcmp(buf, "unspecified"))
+ connector->force = DRM_FORCE_UNSPECIFIED;
+ else
+ return -EINVAL;
+
+ return len;
+}
+
+static int edid_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+ struct drm_property_blob *edid = connector->edid_blob_ptr;
+
+ if (connector->override_edid && edid)
+ seq_write(m, edid->data, edid->length);
+
+ return 0;
+}
+
+static int edid_open(struct inode *inode, struct file *file)
+{
+ struct drm_connector *dev = inode->i_private;
+
+ return single_open(file, edid_show, dev);
+}
+
+static ssize_t edid_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ struct seq_file *m = file->private_data;
+ struct drm_connector *connector = m->private;
+ char *buf;
+ struct edid *edid;
+ int ret;
+
+ buf = memdup_user(ubuf, len);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ edid = (struct edid *) buf;
+
+ if (len == 5 && !strncmp(buf, "reset", 5)) {
+ connector->override_edid = false;
+ ret = drm_connector_update_edid_property(connector, NULL);
+ } else if (len < EDID_LENGTH ||
+ EDID_LENGTH * (1 + edid->extensions) > len)
+ ret = -EINVAL;
+ else {
+ connector->override_edid = false;
+ ret = drm_connector_update_edid_property(connector, edid);
+ if (!ret)
+ connector->override_edid = true;
+ }
+
+ kfree(buf);
+
+ return (ret) ? ret : len;
+}
+
+static const struct file_operations drm_edid_fops = {
+ .owner = THIS_MODULE,
+ .open = edid_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = edid_write
+};
+
+
+static const struct file_operations drm_connector_fops = {
+ .owner = THIS_MODULE,
+ .open = connector_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = connector_write
+};
+
+int drm_debugfs_connector_add(struct drm_connector *connector)
+{
+ struct drm_minor *minor = connector->dev->primary;
+ struct dentry *root, *ent;
+
+ if (!minor->debugfs_root)
+ return -1;
+
+ root = debugfs_create_dir(connector->name, minor->debugfs_root);
+ if (!root)
+ return -ENOMEM;
+
+ connector->debugfs_entry = root;
+
+ /* force */
+ ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
+ &drm_connector_fops);
+ if (!ent)
+ goto error;
+
+ /* edid */
+ ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
+ connector, &drm_edid_fops);
+ if (!ent)
+ goto error;
+
+ return 0;
+
+error:
+ debugfs_remove_recursive(connector->debugfs_entry);
+ connector->debugfs_entry = NULL;
+ return -ENOMEM;
+}
+
+void drm_debugfs_connector_remove(struct drm_connector *connector)
+{
+ if (!connector->debugfs_entry)
+ return;
+
+ debugfs_remove_recursive(connector->debugfs_entry);
+
+ connector->debugfs_entry = NULL;
+}
+
+int drm_debugfs_crtc_add(struct drm_crtc *crtc)
+{
+ struct drm_minor *minor = crtc->dev->primary;
+ struct dentry *root;
+ char *name;
+
+ name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
+ if (!name)
+ return -ENOMEM;
+
+ root = debugfs_create_dir(name, minor->debugfs_root);
+ kfree(name);
+ if (!root)
+ return -ENOMEM;
+
+ crtc->debugfs_entry = root;
+
+ if (drm_debugfs_crtc_crc_add(crtc))
+ goto error;
+
+ return 0;
+
+error:
+ drm_debugfs_crtc_remove(crtc);
+ return -ENOMEM;
+}
+
+void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
+{
+ debugfs_remove_recursive(crtc->debugfs_entry);
+ crtc->debugfs_entry = NULL;
+}
+
+#endif /* CONFIG_DEBUG_FS */