[PATCH 09/20] of/fdt: create common debugfs

Rob Herring robherring2 at gmail.com
Fri Apr 4 09:16:52 EST 2014


From: Rob Herring <robh at kernel.org>

Both powerpc and microblaze have the same FDT blob in debugfs feature.
Move this to common location and remove the powerpc and microblaze
implementations. This feature could become more useful when FDT
overlay support is added.

This changes the path of the blob from "$arch/flat-device-tree" to
"device-tree/flat-device-tree".

Signed-off-by: Rob Herring <robh at kernel.org>
Cc: Michal Simek <monstr at monstr.eu>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: linuxppc-dev at lists.ozlabs.org
---
 arch/microblaze/kernel/prom.c | 31 -------------------------------
 arch/powerpc/kernel/prom.c    | 21 ---------------------
 drivers/of/fdt.c              | 24 ++++++++++++++++++++++++
 3 files changed, 24 insertions(+), 52 deletions(-)

diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index abdfb10..1312cd2 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -114,34 +114,3 @@ void __init early_init_devtree(void *params)
 
 	pr_debug(" <- early_init_devtree()\n");
 }
-
-/*******
- *
- * New implementation of the OF "find" APIs, return a refcounted
- * object, call of_node_put() when done.  The device tree and list
- * are protected by a rw_lock.
- *
- * Note that property management will need some locking as well,
- * this isn't dealt with yet.
- *
- *******/
-
-#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
-static struct debugfs_blob_wrapper flat_dt_blob;
-
-static int __init export_flat_device_tree(void)
-{
-	struct dentry *d;
-
-	flat_dt_blob.data = initial_boot_params;
-	flat_dt_blob.size = initial_boot_params->totalsize;
-
-	d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
-				of_debugfs_root, &flat_dt_blob);
-	if (!d)
-		return 1;
-
-	return 0;
-}
-device_initcall(export_flat_device_tree);
-#endif
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index dd72beb..7c2f90c 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -29,7 +29,6 @@
 #include <linux/bitops.h>
 #include <linux/export.h>
 #include <linux/kexec.h>
-#include <linux/debugfs.h>
 #include <linux/irq.h>
 #include <linux/memblock.h>
 #include <linux/of.h>
@@ -918,23 +917,3 @@ bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 {
 	return (int)phys_id == get_hard_smp_processor_id(cpu);
 }
-
-#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
-static struct debugfs_blob_wrapper flat_dt_blob;
-
-static int __init export_flat_device_tree(void)
-{
-	struct dentry *d;
-
-	flat_dt_blob.data = initial_boot_params;
-	flat_dt_blob.size = be32_to_cpu(initial_boot_params->totalsize);
-
-	d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
-				powerpc_debugfs_root, &flat_dt_blob);
-	if (!d)
-		return 1;
-
-	return 0;
-}
-__initcall(export_flat_device_tree);
-#endif
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index fa16a91..2085d47 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -20,6 +20,7 @@
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <linux/debugfs.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #ifdef CONFIG_PPC
@@ -1084,4 +1085,27 @@ void __init unflatten_and_copy_device_tree(void)
 	unflatten_device_tree();
 }
 
+#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
+static struct debugfs_blob_wrapper flat_dt_blob;
+
+static int __init of_flat_dt_debugfs_export_fdt(void)
+{
+	struct dentry *d = debugfs_create_dir("device-tree", NULL);
+
+	if (!d)
+		return -ENOENT;
+
+	flat_dt_blob.data = initial_boot_params;
+	flat_dt_blob.size = fdt_totalsize(initial_boot_params);
+
+	d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
+				d, &flat_dt_blob);
+	if (!d)
+		return -ENOENT;
+
+	return 0;
+}
+module_init(of_flat_dt_debugfs_export_fdt);
+#endif
+
 #endif /* CONFIG_OF_EARLY_FLATTREE */
-- 
1.8.3.2



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