drm/amdgpu: do not keep debugfs dentry

Cleanup unnecessary debugfs dentries and surrounding functions.

v3: remove return value check for debugfs_create_file()
v2: remove ttm_debugfs_entries array.
    do not init variables.
Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -793,10 +793,6 @@ struct amdgpu_device {
 	struct amdgpu_i2c_chan		*i2c_bus[AMDGPU_MAX_I2C_BUS];
 	struct amdgpu_debugfs		debugfs[AMDGPU_DEBUGFS_MAX_COMPONENTS];
 	unsigned			debugfs_count;
-#if defined(CONFIG_DEBUG_FS)
-	struct dentry                   *debugfs_preempt;
-	struct dentry			*debugfs_regs[AMDGPU_DEBUGFS_MAX_COMPONENTS];
-#endif
 	struct amdgpu_atif		*atif;
 	struct amdgpu_atcs		atcs;
 	struct mutex			srbm_mutex;

drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

@@ -1228,7 +1228,6 @@ int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
 					  adev, debugfs_regs[i]);
 		if (!i && !IS_ERR_OR_NULL(ent))
 			i_size_write(ent->d_inode, adev->rmmio_size);
-		adev->debugfs_regs[i] = ent;
 	}
 
 	return 0;
@@ -1594,22 +1593,21 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_sclk_set, NULL,
 
 int amdgpu_debugfs_init(struct amdgpu_device *adev)
 {
+	struct dentry *ent;
 	int r, i;
 
-	adev->debugfs_preempt =
-		debugfs_create_file("amdgpu_preempt_ib", 0600,
-				    adev_to_drm(adev)->primary->debugfs_root, adev,
-				    &fops_ib_preempt);
-	if (!(adev->debugfs_preempt)) {
+	ent = debugfs_create_file("amdgpu_preempt_ib", 0600,
+				  adev_to_drm(adev)->primary->debugfs_root, adev,
+				  &fops_ib_preempt);
+	if (!ent) {
 		DRM_ERROR("unable to create amdgpu_preempt_ib debugsfs file\n");
 		return -EIO;
 	}
 
-	adev->smu.debugfs_sclk =
-		debugfs_create_file("amdgpu_force_sclk", 0200,
-				    adev_to_drm(adev)->primary->debugfs_root, adev,
-				    &fops_sclk_set);
-	if (!(adev->smu.debugfs_sclk)) {
+	ent = debugfs_create_file("amdgpu_force_sclk", 0200,
+				  adev_to_drm(adev)->primary->debugfs_root, adev,
+				  &fops_sclk_set);
+	if (!ent) {
 		DRM_ERROR("unable to create amdgpu_set_sclk debugsfs file\n");
 		return -EIO;
 	}

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -1137,16 +1137,17 @@ static int amdgpu_ras_sysfs_remove_all(struct amdgpu_device *adev)
  *
  */
 /* debugfs begin */
-static void amdgpu_ras_debugfs_create_ctrl_node(struct amdgpu_device *adev)
+struct dentry *amdgpu_ras_debugfs_create_ctrl_node(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+	struct dentry *dir;
 	struct drm_minor *minor = adev_to_drm(adev)->primary;
 
-	con->dir = debugfs_create_dir(RAS_FS_NAME, minor->debugfs_root);
-	debugfs_create_file("ras_ctrl", S_IWUGO | S_IRUGO, con->dir,
-				adev, &amdgpu_ras_debugfs_ctrl_ops);
-	debugfs_create_file("ras_eeprom_reset", S_IWUGO | S_IRUGO, con->dir,
-				adev, &amdgpu_ras_debugfs_eeprom_ops);
+	dir = debugfs_create_dir(RAS_FS_NAME, minor->debugfs_root);
+	debugfs_create_file("ras_ctrl", S_IWUGO | S_IRUGO, dir, adev,
+			    &amdgpu_ras_debugfs_ctrl_ops);
+	debugfs_create_file("ras_eeprom_reset", S_IWUGO | S_IRUGO, dir, adev,
+			    &amdgpu_ras_debugfs_eeprom_ops);
 
 	/*
 	 * After one uncorrectable error happens, usually GPU recovery will
@@ -1156,24 +1157,24 @@ static void amdgpu_ras_debugfs_create_ctrl_node(struct amdgpu_device *adev)
 	 * ERREVENT_ATHUB_INTERRUPT generated. Normal GPU recovery routine
 	 * will never be called.
 	 */
-	debugfs_create_bool("auto_reboot", S_IWUGO | S_IRUGO, con->dir,
-				&con->reboot);
+	debugfs_create_bool("auto_reboot", S_IWUGO | S_IRUGO, dir, &con->reboot);
 
 	/*
 	 * User could set this not to clean up hardware's error count register
 	 * of RAS IPs during ras recovery.
 	 */
-	debugfs_create_bool("disable_ras_err_cnt_harvest", 0644,
-			con->dir, &con->disable_ras_err_cnt_harvest);
+	debugfs_create_bool("disable_ras_err_cnt_harvest", 0644, dir,
+			    &con->disable_ras_err_cnt_harvest);
+	return dir;
 }
 
 static void amdgpu_ras_debugfs_create(struct amdgpu_device *adev,
-		struct ras_fs_if *head)
+				      struct ras_fs_if *head,
+				      struct dentry *dir)
 {
-	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 	struct ras_manager *obj = amdgpu_ras_find_obj(adev, &head->head);
 
-	if (!obj || obj->ent)
+	if (!obj || !dir)
 		return;
 
 	get_obj(obj);
@@ -1182,14 +1183,14 @@ static void amdgpu_ras_debugfs_create(struct amdgpu_device *adev,
 			head->debugfs_name,
 			sizeof(obj->fs_data.debugfs_name));
 
-	obj->ent = debugfs_create_file(obj->fs_data.debugfs_name,
-				       S_IWUGO | S_IRUGO, con->dir, obj,
-				       &amdgpu_ras_debugfs_ops);
+	debugfs_create_file(obj->fs_data.debugfs_name, S_IWUGO | S_IRUGO, dir,
+			    obj, &amdgpu_ras_debugfs_ops);
 }
 
 void amdgpu_ras_debugfs_create_all(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+	struct dentry *dir;
 	struct ras_manager *obj;
 	struct ras_fs_if fs_info;
 
@@ -1200,7 +1201,7 @@ void amdgpu_ras_debugfs_create_all(struct amdgpu_device *adev)
 	if (!IS_ENABLED(CONFIG_DEBUG_FS) || !con)
 		return;
 
-	amdgpu_ras_debugfs_create_ctrl_node(adev);
+	dir = amdgpu_ras_debugfs_create_ctrl_node(adev);
 
 	list_for_each_entry(obj, &con->head, node) {
 		if (amdgpu_ras_is_supported(adev, obj->head.block) &&
@@ -1208,34 +1209,11 @@ void amdgpu_ras_debugfs_create_all(struct amdgpu_device *adev)
 			sprintf(fs_info.debugfs_name, "%s_err_inject",
 					ras_block_str(obj->head.block));
 			fs_info.head = obj->head;
-			amdgpu_ras_debugfs_create(adev, &fs_info);
+			amdgpu_ras_debugfs_create(adev, &fs_info, dir);
 		}
 	}
 }
 
-static void amdgpu_ras_debugfs_remove(struct amdgpu_device *adev,
-		struct ras_common_if *head)
-{
-	struct ras_manager *obj = amdgpu_ras_find_obj(adev, head);
-
-	if (!obj || !obj->ent)
-		return;
-
-	obj->ent = NULL;
-	put_obj(obj);
-}
-
-static void amdgpu_ras_debugfs_remove_all(struct amdgpu_device *adev)
-{
-	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
-	struct ras_manager *obj, *tmp;
-
-	list_for_each_entry_safe(obj, tmp, &con->head, node) {
-		amdgpu_ras_debugfs_remove(adev, &obj->head);
-	}
-
-	con->dir = NULL;
-}
 /* debugfs end */
 
 /* ras fs */
@@ -1282,8 +1260,17 @@ static int amdgpu_ras_fs_init(struct amdgpu_device *adev)
 
 static int amdgpu_ras_fs_fini(struct amdgpu_device *adev)
 {
-	if (IS_ENABLED(CONFIG_DEBUG_FS))
-		amdgpu_ras_debugfs_remove_all(adev);
+	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+	struct ras_manager *con_obj, *ip_obj, *tmp;
+
+	if (IS_ENABLED(CONFIG_DEBUG_FS)) {
+		list_for_each_entry_safe(con_obj, tmp, &con->head, node) {
+			ip_obj = amdgpu_ras_find_obj(adev, &con_obj->head);
+			if (ip_obj)
+				put_obj(ip_obj);
+		}
+	}
+
 	amdgpu_ras_sysfs_remove_all(adev);
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h

@@ -318,8 +318,6 @@ struct amdgpu_ras {
 	uint32_t supported;
 	uint32_t features;
 	struct list_head head;
-	/* debugfs */
-	struct dentry *dir;
 	/* sysfs */
 	struct device_attribute features_attr;
 	struct bin_attribute badpages_attr;
@@ -395,8 +393,6 @@ struct ras_manager {
 	struct list_head node;
 	/* the device */
 	struct amdgpu_device *adev;
-	/* debugfs */
-	struct dentry *ent;
 	/* sysfs */
 	struct device_attribute sysfs_attr;
 	int attr_inuse;

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1696,7 +1696,7 @@ static void amdgpu_ttm_training_data_block_init(struct amdgpu_device *adev)
 		(adev->gmc.mc_vram_size - GDDR6_MEM_TRAINING_OFFSET);
 	ctx->train_data_size =
 		GDDR6_MEM_TRAINING_DATA_SIZE_IN_BYTES;
-	
+
 	DRM_DEBUG("train_data_size:%llx,p2c_train_data_offset:%llx,c2p_train_data_offset:%llx.\n",
 			ctx->train_data_size,
 			ctx->p2c_train_data_offset,
@@ -2474,18 +2474,6 @@ static const struct file_operations amdgpu_ttm_iomem_fops = {
 	.llseek = default_llseek
 };
 
-static const struct {
-	char *name;
-	const struct file_operations *fops;
-	int domain;
-} ttm_debugfs_entries[] = {
-	{ "amdgpu_vram", &amdgpu_ttm_vram_fops, TTM_PL_VRAM },
-#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
-	{ "amdgpu_gtt", &amdgpu_ttm_gtt_fops, TTM_PL_TT },
-#endif
-	{ "amdgpu_iomem", &amdgpu_ttm_iomem_fops, TTM_PL_SYSTEM },
-};
-
 #endif
 
 int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
@@ -2494,23 +2482,18 @@ int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
 	unsigned count;
 
 	struct drm_minor *minor = adev_to_drm(adev)->primary;
-	struct dentry *ent, *root = minor->debugfs_root;
-
-	for (count = 0; count < ARRAY_SIZE(ttm_debugfs_entries); count++) {
-		ent = debugfs_create_file(
-				ttm_debugfs_entries[count].name,
-				S_IFREG | S_IRUGO, root,
-				adev,
-				ttm_debugfs_entries[count].fops);
-		if (IS_ERR(ent))
-			return PTR_ERR(ent);
-		if (ttm_debugfs_entries[count].domain == TTM_PL_VRAM)
-			i_size_write(ent->d_inode, adev->gmc.mc_vram_size);
-		else if (ttm_debugfs_entries[count].domain == TTM_PL_TT)
-			i_size_write(ent->d_inode, adev->gmc.gart_size);
-		adev->mman.debugfs_entries[count] = ent;
-	}
+	umode_t mode = S_IFREG | S_IRUGO;
+	struct dentry *root = minor->debugfs_root;
+
+	debugfs_create_file_size("amdgpu_vram", mode, root, adev,
+				 &amdgpu_ttm_vram_fops, adev->gmc.mc_vram_size);
+#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
+	debugfs_create_file_size("amdgpu_gtt", mode, root, adev,
+				 &amdgpu_ttm_gtt_fops, adev->gmc.gart_size);
+#endif
 
+	debugfs_create_file("amdgpu_iomem", mode, root, adev,
+			    &amdgpu_ttm_iomem_fops);
 	count = ARRAY_SIZE(amdgpu_ttm_debugfs_list);
 	return amdgpu_debugfs_add_files(adev, amdgpu_ttm_debugfs_list, count);
 #else

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h

@@ -64,10 +64,6 @@ struct amdgpu_mman {
 	bool				initialized;
 	void __iomem			*aper_base_kaddr;
 
-#if defined(CONFIG_DEBUG_FS)
-	struct dentry			*debugfs_entries[8];
-#endif
-
 	/* buffer handling */
 	const struct amdgpu_buffer_funcs	*buffer_funcs;
 	struct amdgpu_ring			*buffer_funcs_ring;

drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h

@@ -439,9 +439,6 @@ struct smu_context
 	struct smu_baco_context		smu_baco;
 	struct smu_temperature_range	thermal_range;
 	void *od_settings;
-#if defined(CONFIG_DEBUG_FS)
-	struct dentry                   *debugfs_sclk;
-#endif
 
 	struct smu_umd_pstate_table	pstate_table;
 	uint32_t pstate_sclk;