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path: root/drivers/gpu/drm/v3d/v3d_gemfs.c
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Diffstat (limited to 'drivers/gpu/drm/v3d/v3d_gemfs.c')
-rw-r--r--drivers/gpu/drm/v3d/v3d_gemfs.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/gpu/drm/v3d/v3d_gemfs.c b/drivers/gpu/drm/v3d/v3d_gemfs.c
new file mode 100644
index 000000000000..4c5e18590a5c
--- /dev/null
+++ b/drivers/gpu/drm/v3d/v3d_gemfs.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (C) 2024 Raspberry Pi */
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+
+#include "v3d_drv.h"
+
+void v3d_gemfs_init(struct v3d_dev *v3d)
+{
+ char huge_opt[] = "huge=within_size";
+ struct file_system_type *type;
+ struct vfsmount *gemfs;
+
+ /*
+ * By creating our own shmemfs mountpoint, we can pass in
+ * mount flags that better match our usecase. However, we
+ * only do so on platforms which benefit from it.
+ */
+ 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;
+
+ gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt);
+ if (IS_ERR(gemfs))
+ goto err;
+
+ v3d->gemfs = gemfs;
+ drm_info(&v3d->drm, "Using Transparent Hugepages\n");
+
+ return;
+
+err:
+ v3d->gemfs = NULL;
+ drm_notice(&v3d->drm,
+ "Transparent Hugepage support is recommended for optimal performance on this platform!\n");
+}
+
+void v3d_gemfs_fini(struct v3d_dev *v3d)
+{
+ if (v3d->gemfs)
+ kern_unmount(v3d->gemfs);
+}