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authorGreg Kroah-Hartman <gregkh@suse.de>2012-01-06 11:42:52 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-06 11:42:52 -0800
commitff4b8a57f0aaa2882d444ca44b2b9b333d22a4df (patch)
treed851c923f85566572112d4c0f884cff388a3cc05 /Documentation/filesystems
parent805a6af8dba5dfdd35ec35dc52ec0122400b2610 (diff)
parentea04018e6bc5ddb2f0466c0e5b986bd4901b7e8e (diff)
Merge branch 'driver-core-next' into Linux 3.2
This resolves the conflict in the arch/arm/mach-s3c64xx/s3c6400.c file, and it fixes the build error in the arch/x86/kernel/microcode_core.c file, that the merge did not catch. The microcode_core.c patch was provided by Stephen Rothwell <sfr@canb.auug.org.au> who was invaluable in the merge issues involved with the large sysdev removal process in the driver-core tree. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/debugfs.txt32
1 files changed, 31 insertions, 1 deletions
diff --git a/Documentation/filesystems/debugfs.txt b/Documentation/filesystems/debugfs.txt
index 742cc06e138..f04066a37f4 100644
--- a/Documentation/filesystems/debugfs.txt
+++ b/Documentation/filesystems/debugfs.txt
@@ -97,7 +97,8 @@ A read on the resulting file will yield either Y (for non-zero values) or
N, followed by a newline. If written to, it will accept either upper- or
lower-case values, or 1 or 0. Any other input will be silently ignored.
-Finally, a block of arbitrary binary data can be exported with:
+Another option is exporting a block of arbitrary binary data, with
+this structure and function:
struct debugfs_blob_wrapper {
void *data;
@@ -115,6 +116,35 @@ can be used to export binary information, but there does not appear to be
any code which does so in the mainline. Note that all files created with
debugfs_create_blob() are read-only.
+If you want to dump a block of registers (something that happens quite
+often during development, even if little such code reaches mainline.
+Debugfs offers two functions: one to make a registers-only file, and
+another to insert a register block in the middle of another sequential
+file.
+
+ struct debugfs_reg32 {
+ char *name;
+ unsigned long offset;
+ };
+
+ struct debugfs_regset32 {
+ struct debugfs_reg32 *regs;
+ int nregs;
+ void __iomem *base;
+ };
+
+ struct dentry *debugfs_create_regset32(const char *name, mode_t mode,
+ struct dentry *parent,
+ struct debugfs_regset32 *regset);
+
+ int debugfs_print_regs32(struct seq_file *s, struct debugfs_reg32 *regs,
+ int nregs, void __iomem *base, char *prefix);
+
+The "base" argument may be 0, but you may want to build the reg32 array
+using __stringify, and a number of register names (macros) are actually
+byte offsets over a base for the register block.
+
+
There are a couple of other directory-oriented helper functions:
struct dentry *debugfs_rename(struct dentry *old_dir,