From 5e2beb172d5d50b118ab4f1f866724c298f938cd Mon Sep 17 00:00:00 2001
From: Zack Rusin <zackr@vmware.com>
Date: Mon, 11 Apr 2022 23:35:22 -0400
Subject: drm/ttm: Add common debugfs code for resource managers
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Git-commit: 8cd9efd1b7fb329681d5a5fdf441c8fc8dc4f5ae
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

Drivers duplicate the code required to add debugfs entries for various
ttm resource managers. To fix it add common TTM resource manager debugfs
code that each driver can reuse.

Specific resource managers can overwrite
ttm_resource_manager_func::debug to get more information from those
debugfs entries.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220412033526.369115-2-zack@kde.org
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/ttm/ttm_resource.c | 34 ++++++++++++++++++++++++++++++
 include/drm/ttm/ttm_resource.h     |  4 ++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index 7d5a438180e9..65889b3caf50 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -644,3 +644,37 @@ ttm_kmap_iter_linear_io_fini(struct ttm_kmap_iter_linear_io *iter_io,
 
 	ttm_mem_io_free(bdev, mem);
 }
+
+#if defined(CONFIG_DEBUG_FS)
+
+static int ttm_resource_manager_show(struct seq_file *m, void *unused)
+{
+	struct ttm_resource_manager *man =
+		(struct ttm_resource_manager *)m->private;
+	struct drm_printer p = drm_seq_file_printer(m);
+	ttm_resource_manager_debug(man, &p);
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(ttm_resource_manager);
+
+#endif
+
+/**
+ * ttm_resource_manager_create_debugfs - Create debugfs entry for specified
+ * resource manager.
+ * @man: The TTM resource manager for which the debugfs stats file be creates
+ * @parent: debugfs directory in which the file will reside
+ * @name: The filename to create.
+ *
+ * This function setups up a debugfs file that can be used to look
+ * at debug statistics of the specified ttm_resource_manager.
+ */
+void ttm_resource_manager_create_debugfs(struct ttm_resource_manager *man,
+					 struct dentry * parent,
+					 const char *name)
+{
+#if defined(CONFIG_DEBUG_FS)
+	debugfs_create_file(name, 0444, parent, man, &ttm_resource_manager_fops);
+#endif
+}
+EXPORT_SYMBOL(ttm_resource_manager_create_debugfs);
diff --git a/include/drm/ttm/ttm_resource.h b/include/drm/ttm/ttm_resource.h
index f82fee18c07f..441653693970 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -381,4 +381,8 @@ ttm_kmap_iter_linear_io_init(struct ttm_kmap_iter_linear_io *iter_io,
 void ttm_kmap_iter_linear_io_fini(struct ttm_kmap_iter_linear_io *iter_io,
 				  struct ttm_device *bdev,
 				  struct ttm_resource *mem);
+
+void ttm_resource_manager_create_debugfs(struct ttm_resource_manager *man,
+					 struct dentry * parent,
+					 const char *name);
 #endif
-- 
2.38.1