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authorMichael Ellerman <michael@ellerman.id.au>2006-06-23 18:16:03 +1000
committerPaul Mackerras <paulus@samba.org>2006-06-28 11:59:46 +1000
commit7a4571ae553e2972b7958306fd796a2fd24fd7d1 (patch)
tree62111278b4bf452e1c481a2e662b910758b8d123 /arch
parent1dce0e30471ac863fd141d137c98e3644817975e (diff)
downloadop-kernel-dev-7a4571ae553e2972b7958306fd796a2fd24fd7d1.zip
op-kernel-dev-7a4571ae553e2972b7958306fd796a2fd24fd7d1.tar.gz
[POWERPC] Export flat device tree via debugfs for debugging
If DEBUG is turned on in prom.c, export the flat device tree via debugfs. This has been handy on several occasions. To look at it: # mount -t debugfs none /sys/kernel/debug # od -a /sys/kernel/debug/powerpc/flat-device-tree and/or # dtc -fI dtb /sys/kernel/debug/powerpc/flat-device-tree -O dts Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/prom.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 483455c..efed4bc 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -30,6 +30,7 @@
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kexec.h>
+#include <linux/debugfs.h>
#include <asm/prom.h>
#include <asm/rtas.h>
@@ -2148,3 +2149,27 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
}
return NULL;
}
+
+#ifdef DEBUG
+static struct debugfs_blob_wrapper flat_dt_blob;
+
+static int __init export_flat_device_tree(void)
+{
+ struct dentry *d;
+
+ d = debugfs_create_dir("powerpc", NULL);
+ if (!d)
+ return 1;
+
+ 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,
+ d, &flat_dt_blob);
+ if (!d)
+ return 1;
+
+ return 0;
+}
+__initcall(export_flat_device_tree);
+#endif
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