From 53aa50017a2d7f730d4aae4bea41619d7a92bb03 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ma=C3=ADra=20Canal?= <mcanal@igalia.com>
Date: Mon, 23 Sep 2024 10:55:14 -0300
Subject: [PATCH] drm/v3d: Add modparam for turning off Big/Super Pages
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Commit 0df4a13ca8bed29cbc362c99b958fbb8b27b1675 upstream

Add a modparam for turning off Big/Super Pages to make sure that if an
user doesn't want Big/Super Pages enabled, it can disabled it by setting
the modparam to false.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923141348.2422499-11-mcanal@igalia.com
---
 drivers/gpu/drm/v3d/v3d_drv.c   | 7 +++++++
 drivers/gpu/drm/v3d/v3d_drv.h   | 1 +
 drivers/gpu/drm/v3d/v3d_gemfs.c | 4 ++++
 3 files changed, 12 insertions(+)

--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -40,6 +40,13 @@
 #define DRIVER_MINOR 0
 #define DRIVER_PATCHLEVEL 0
 
+/* Only expose the `super_pages` modparam if THP is enabled. */
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+bool super_pages = true;
+module_param_named(super_pages, super_pages, bool, 0400);
+MODULE_PARM_DESC(super_pages, "Enable/Disable Super Pages support.");
+#endif
+
 static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
 			       struct drm_file *file_priv)
 {
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -553,6 +553,7 @@ void v3d_invalidate_caches(struct v3d_de
 void v3d_clean_caches(struct v3d_dev *v3d);
 
 /* v3d_gemfs.c */
+extern bool super_pages;
 void v3d_gemfs_init(struct v3d_dev *v3d);
 void v3d_gemfs_fini(struct v3d_dev *v3d);
 
--- a/drivers/gpu/drm/v3d/v3d_gemfs.c
+++ b/drivers/gpu/drm/v3d/v3d_gemfs.c
@@ -20,6 +20,10 @@ void v3d_gemfs_init(struct v3d_dev *v3d)
 	if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
 		goto err;
 
+	/* The user doesn't want to enable Super Pages */
+	if (!super_pages)
+		goto err;
+
 	type = get_fs_type("tmpfs");
 	if (!type)
 		goto err;
