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debugfs: add tools to printk 32-bit registers

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Some debugfs file I deal with are mostly blocks of registers,
i.e. lines of the form "<name> = 0x<value>". Some files are only
registers, some include registers blocks among other material.  This
patch introduces data structures and functions to deal with both
cases.  I expect more users of this over time.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alessandro Rubini
2011-11-18 14:50:21 +01:00
committed by Greg Kroah-Hartman
parent fe7484834b
commit 1a087c6ad9
3 changed files with 147 additions and 1 deletions
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32
Documentation/filesystems/debugfs.txt
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@@ -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,