commit e958203796650e3959a43708d67534bf36f4c83b
author b.liu <b.liu@mobiletek.cn> Thu Apr 17 19:18:16 2025 +0800
committer b.liu <b.liu@mobiletek.cn> Thu Apr 17 19:18:16 2025 +0800
tree b2d43b7c77053224287779c12b5e890cadc3d327
parent f51a5559b56d8fd47d9623531065443befb43e5b

ASR_BASE

Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1

marvell/linux/arch/x86/mm/debug_pagetables.c

diff --git a/marvell/linux/arch/x86/mm/debug_pagetables.c b/marvell/linux/arch/x86/mm/debug_pagetables.c
new file mode 100644
index 0000000..39001a4
--- /dev/null
+++ b/marvell/linux/arch/x86/mm/debug_pagetables.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/debugfs.h>
+#include <linux/efi.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <asm/pgtable.h>
+
+static int ptdump_show(struct seq_file *m, void *v)
+{
+	ptdump_walk_pgd_level_debugfs(m, NULL, false);
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(ptdump);
+
+static int ptdump_curknl_show(struct seq_file *m, void *v)
+{
+	if (current->mm->pgd) {
+		down_read(&current->mm->mmap_sem);
+		ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, false);
+		up_read(&current->mm->mmap_sem);
+	}
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(ptdump_curknl);
+
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+static int ptdump_curusr_show(struct seq_file *m, void *v)
+{
+	if (current->mm->pgd) {
+		down_read(&current->mm->mmap_sem);
+		ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, true);
+		up_read(&current->mm->mmap_sem);
+	}
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(ptdump_curusr);
+#endif
+
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+static int ptdump_efi_show(struct seq_file *m, void *v)
+{
+	if (efi_mm.pgd)
+		ptdump_walk_pgd_level_debugfs(m, efi_mm.pgd, false);
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(ptdump_efi);
+#endif
+
+static struct dentry *dir;
+
+static int __init pt_dump_debug_init(void)
+{
+	dir = debugfs_create_dir("page_tables", NULL);
+
+	debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
+	debugfs_create_file("current_kernel", 0400, dir, NULL,
+			    &ptdump_curknl_fops);
+
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	debugfs_create_file("current_user", 0400, dir, NULL,
+			    &ptdump_curusr_fops);
+#endif
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+	debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
+#endif
+	return 0;
+}
+
+static void __exit pt_dump_debug_exit(void)
+{
+	debugfs_remove_recursive(dir);
+}
+
+module_init(pt_dump_debug_init);
+module_exit(pt_dump_debug_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
+MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");