summaryrefslogtreecommitdiff
path: root/arch/x86/mm/debug_pagetables.c
diff options
context:
space:
mode:
authorAndy Lutomirski <luto@kernel.org>2018-01-31 18:56:22 +0300
committerIngo Molnar <mingo@kernel.org>2018-02-13 18:00:45 +0300
commit116fef6408599dd6ff6996235c50aa692e9b5631 (patch)
tree4afdb667d6d41cede6db3f47b21b86ceb8b0341a /arch/x86/mm/debug_pagetables.c
parent1070730c1ad2bd49b0d11112728f1f4390137728 (diff)
downloadlinux-116fef6408599dd6ff6996235c50aa692e9b5631.tar.xz
x86/mm/dump_pagetables: Add the EFI pagetable to the debugfs 'page_tables' directory
EFI is complicated enough that being able to view its pagetables is quite helpful. Rather than requiring users to fish it out of dmesg on an appropriately configured kernel, let users view it in debugfs as well. Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/ba158a93f3250e6fca752cff2cfb1fcdd9f2b50c.1517414050.git.luto@kernel.org [ Fixed trivial whitespace damage and fixed missing export. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm/debug_pagetables.c')
-rw-r--r--arch/x86/mm/debug_pagetables.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c
index 421f2664ffa0..51a6f92da2bf 100644
--- a/arch/x86/mm/debug_pagetables.c
+++ b/arch/x86/mm/debug_pagetables.c
@@ -72,6 +72,31 @@ static const struct file_operations ptdump_curusr_fops = {
};
#endif
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+extern pgd_t *efi_pgd;
+static struct dentry *pe_efi;
+
+static int ptdump_show_efi(struct seq_file *m, void *v)
+{
+ if (efi_pgd)
+ ptdump_walk_pgd_level_debugfs(m, efi_pgd, false);
+ return 0;
+}
+
+static int ptdump_open_efi(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, ptdump_show_efi, NULL);
+}
+
+static const struct file_operations ptdump_efi_fops = {
+ .owner = THIS_MODULE,
+ .open = ptdump_open_efi,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif
+
static struct dentry *dir, *pe_knl, *pe_curknl;
static int __init pt_dump_debug_init(void)
@@ -96,6 +121,13 @@ static int __init pt_dump_debug_init(void)
if (!pe_curusr)
goto err;
#endif
+
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+ pe_efi = debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
+ if (!pe_efi)
+ goto err;
+#endif
+
return 0;
err:
debugfs_remove_recursive(dir);