313162d0b8
The <linux/device.h> header includes a lot of stuff, and it in turn gets a lot of use just for the basic "struct device" which appears so often. Clean up the users as follows: 1) For those headers only needing "struct device" as a pointer in fcn args, replace the include with exactly that. 2) For headers not really using anything from device.h, simply delete the include altogether. 3) For headers relying on getting device.h implicitly before being included themselves, now explicitly include device.h 4) For files in which doing #1 or #2 uncovers an implicit dependency on some other header, fix by explicitly adding the required header(s). Any C files that were implicitly relying on device.h to be present have already been dealt with in advance. Total removals from #1 and #2: 51. Total additions coming from #3: 9. Total other implicit dependencies from #4: 7. As of 3.3-rc1, there were 110, so a net removal of 42 gives about a 38% reduction in device.h presence in include/* Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
527 lines
15 KiB
C
527 lines
15 KiB
C
/*
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* Linux WiMAX
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* Collection of tools to manage debug operations.
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*
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*
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* Copyright (C) 2005-2007 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* Don't #include this file directly, read on!
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*
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*
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* EXECUTING DEBUGGING ACTIONS OR NOT
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*
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* The main thing this framework provides is decission power to take a
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* debug action (like printing a message) if the current debug level
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* allows it.
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*
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* The decission power is at two levels: at compile-time (what does
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* not make it is compiled out) and at run-time. The run-time
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* selection is done per-submodule (as they are declared by the user
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* of the framework).
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*
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* A call to d_test(L) (L being the target debug level) returns true
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* if the action should be taken because the current debug levels
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* allow it (both compile and run time).
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*
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* It follows that a call to d_test() that can be determined to be
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* always false at compile time will get the code depending on it
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* compiled out by optimization.
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*
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*
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* DEBUG LEVELS
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*
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* It is up to the caller to define how much a debugging level is.
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*
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* Convention sets 0 as "no debug" (so an action marked as debug level 0
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* will always be taken). The increasing debug levels are used for
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* increased verbosity.
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*
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*
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* USAGE
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*
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* Group the code in modules and submodules inside each module [which
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* in most cases maps to Linux modules and .c files that compose
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* those].
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*
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*
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* For each module, there is:
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*
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* - a MODULENAME (single word, legal C identifier)
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*
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* - a debug-levels.h header file that declares the list of
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* submodules and that is included by all .c files that use
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* the debugging tools. The file name can be anything.
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*
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* - some (optional) .c code to manipulate the runtime debug levels
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* through debugfs.
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*
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* The debug-levels.h file would look like:
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*
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* #ifndef __debug_levels__h__
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* #define __debug_levels__h__
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*
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* #define D_MODULENAME modulename
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* #define D_MASTER 10
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*
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* #include <linux/wimax/debug.h>
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*
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* enum d_module {
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* D_SUBMODULE_DECLARE(submodule_1),
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* D_SUBMODULE_DECLARE(submodule_2),
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* ...
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* D_SUBMODULE_DECLARE(submodule_N)
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* };
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*
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* #endif
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*
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* D_MASTER is the maximum compile-time debug level; any debug actions
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* above this will be out. D_MODULENAME is the module name (legal C
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* identifier), which has to be unique for each module (to avoid
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* namespace collisions during linkage). Note those #defines need to
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* be done before #including debug.h
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*
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* We declare N different submodules whose debug level can be
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* independently controlled during runtime.
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*
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* In a .c file of the module (and only in one of them), define the
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* following code:
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*
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* struct d_level D_LEVEL[] = {
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* D_SUBMODULE_DEFINE(submodule_1),
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* D_SUBMODULE_DEFINE(submodule_2),
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* ...
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* D_SUBMODULE_DEFINE(submodule_N),
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* };
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* size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
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*
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* Externs for d_level_MODULENAME and d_level_size_MODULENAME are used
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* and declared in this file using the D_LEVEL and D_LEVEL_SIZE macros
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* #defined also in this file.
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*
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* To manipulate from user space the levels, create a debugfs dentry
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* and then register each submodule with:
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*
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* result = d_level_register_debugfs("PREFIX_", submodule_X, parent);
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* if (result < 0)
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* goto error;
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*
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* Where PREFIX_ is a name of your chosing. This will create debugfs
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* file with a single numeric value that can be use to tweak it. To
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* remove the entires, just use debugfs_remove_recursive() on 'parent'.
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*
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* NOTE: remember that even if this will show attached to some
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* particular instance of a device, the settings are *global*.
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*
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*
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* On each submodule (for example, .c files), the debug infrastructure
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* should be included like this:
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*
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* #define D_SUBMODULE submodule_x // matches one in debug-levels.h
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* #include "debug-levels.h"
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*
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* after #including all your include files.
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*
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*
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* Now you can use the d_*() macros below [d_test(), d_fnstart(),
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* d_fnend(), d_printf(), d_dump()].
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*
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* If their debug level is greater than D_MASTER, they will be
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* compiled out.
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*
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* If their debug level is lower or equal than D_MASTER but greater
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* than the current debug level of their submodule, they'll be
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* ignored.
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*
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* Otherwise, the action will be performed.
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*/
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#ifndef __debug__h__
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#define __debug__h__
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#include <linux/types.h>
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#include <linux/slab.h>
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struct device;
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/* Backend stuff */
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/*
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* Debug backend: generate a message header from a 'struct device'
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*
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* @head: buffer where to place the header
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* @head_size: length of @head
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* @dev: pointer to device used to generate a header from. If NULL,
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* an empty ("") header is generated.
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*/
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static inline
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void __d_head(char *head, size_t head_size,
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struct device *dev)
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{
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if (dev == NULL)
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head[0] = 0;
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else if ((unsigned long)dev < 4096) {
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printk(KERN_ERR "E: Corrupt dev %p\n", dev);
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WARN_ON(1);
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} else
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snprintf(head, head_size, "%s %s: ",
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dev_driver_string(dev), dev_name(dev));
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}
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/*
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* Debug backend: log some message if debugging is enabled
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*
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* @l: intended debug level
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* @tag: tag to prefix the message with
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* @dev: 'struct device' associated to this message
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* @f: printf-like format and arguments
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*
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* Note this is optimized out if it doesn't pass the compile-time
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* check; however, it is *always* compiled. This is useful to make
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* sure the printf-like formats and variables are always checked and
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* they don't get bit rot if you have all the debugging disabled.
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*/
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#define _d_printf(l, tag, dev, f, a...) \
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do { \
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char head[64]; \
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if (!d_test(l)) \
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break; \
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__d_head(head, sizeof(head), dev); \
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printk(KERN_ERR "%s%s%s: " f, head, __func__, tag, ##a); \
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} while (0)
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/*
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* CPP sintatic sugar to generate A_B like symbol names when one of
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* the arguments is a a preprocessor #define.
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*/
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#define __D_PASTE__(varname, modulename) varname##_##modulename
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#define __D_PASTE(varname, modulename) (__D_PASTE__(varname, modulename))
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#define _D_SUBMODULE_INDEX(_name) (D_SUBMODULE_DECLARE(_name))
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/*
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* Store a submodule's runtime debug level and name
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*/
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struct d_level {
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u8 level;
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const char *name;
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};
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/*
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* List of available submodules and their debug levels
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*
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* We call them d_level_MODULENAME and d_level_size_MODULENAME; the
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* macros D_LEVEL and D_LEVEL_SIZE contain the name already for
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* convenience.
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*
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* This array and the size are defined on some .c file that is part of
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* the current module.
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*/
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#define D_LEVEL __D_PASTE(d_level, D_MODULENAME)
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#define D_LEVEL_SIZE __D_PASTE(d_level_size, D_MODULENAME)
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extern struct d_level D_LEVEL[];
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extern size_t D_LEVEL_SIZE;
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/*
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* Frontend stuff
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*
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*
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* Stuff you need to declare prior to using the actual "debug" actions
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* (defined below).
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*/
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#ifndef D_MODULENAME
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#error D_MODULENAME is not defined in your debug-levels.h file
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/**
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* D_MODULE - Name of the current module
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*
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* #define in your module's debug-levels.h, making sure it is
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* unique. This has to be a legal C identifier.
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*/
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#define D_MODULENAME undefined_modulename
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#endif
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#ifndef D_MASTER
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#warning D_MASTER not defined, but debug.h included! [see docs]
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/**
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* D_MASTER - Compile time maximum debug level
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*
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* #define in your debug-levels.h file to the maximum debug level the
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* runtime code will be allowed to have. This allows you to provide a
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* main knob.
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*
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* Anything above that level will be optimized out of the compile.
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*
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* Defaults to zero (no debug code compiled in).
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*
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* Maximum one definition per module (at the debug-levels.h file).
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*/
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#define D_MASTER 0
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#endif
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#ifndef D_SUBMODULE
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#error D_SUBMODULE not defined, but debug.h included! [see docs]
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/**
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* D_SUBMODULE - Name of the current submodule
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*
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* #define in your submodule .c file before #including debug-levels.h
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* to the name of the current submodule as previously declared and
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* defined with D_SUBMODULE_DECLARE() (in your module's
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* debug-levels.h) and D_SUBMODULE_DEFINE().
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*
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* This is used to provide runtime-control over the debug levels.
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*
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* Maximum one per .c file! Can be shared among different .c files
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* (meaning they belong to the same submodule categorization).
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*/
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#define D_SUBMODULE undefined_module
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#endif
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/**
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* D_SUBMODULE_DECLARE - Declare a submodule for runtime debug level control
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*
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* @_name: name of the submodule, restricted to the chars that make up a
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* valid C identifier ([a-zA-Z0-9_]).
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*
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* Declare in the module's debug-levels.h header file as:
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*
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* enum d_module {
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* D_SUBMODULE_DECLARE(submodule_1),
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* D_SUBMODULE_DECLARE(submodule_2),
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* D_SUBMODULE_DECLARE(submodule_3),
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* };
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*
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* Some corresponding .c file needs to have a matching
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* D_SUBMODULE_DEFINE().
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*/
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#define D_SUBMODULE_DECLARE(_name) __D_SUBMODULE_##_name
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/**
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* D_SUBMODULE_DEFINE - Define a submodule for runtime debug level control
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*
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* @_name: name of the submodule, restricted to the chars that make up a
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* valid C identifier ([a-zA-Z0-9_]).
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*
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* Use once per module (in some .c file) as:
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*
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* static
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* struct d_level d_level_SUBMODULENAME[] = {
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* D_SUBMODULE_DEFINE(submodule_1),
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* D_SUBMODULE_DEFINE(submodule_2),
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* D_SUBMODULE_DEFINE(submodule_3),
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* };
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* size_t d_level_size_SUBDMODULENAME = ARRAY_SIZE(d_level_SUBDMODULENAME);
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*
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* Matching D_SUBMODULE_DECLARE()s have to be present in a
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* debug-levels.h header file.
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*/
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#define D_SUBMODULE_DEFINE(_name) \
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[__D_SUBMODULE_##_name] = { \
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.level = 0, \
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.name = #_name \
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}
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/* The actual "debug" operations */
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/**
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* d_test - Returns true if debugging should be enabled
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*
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* @l: intended debug level (unsigned)
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*
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* If the master debug switch is enabled and the current settings are
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* higher or equal to the requested level, then debugging
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* output/actions should be enabled.
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*
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* NOTE:
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*
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* This needs to be coded so that it can be evaluated in compile
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* time; this is why the ugly BUG_ON() is placed in there, so the
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* D_MASTER evaluation compiles all out if it is compile-time false.
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*/
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#define d_test(l) \
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({ \
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unsigned __l = l; /* type enforcer */ \
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(D_MASTER) >= __l \
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&& ({ \
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BUG_ON(_D_SUBMODULE_INDEX(D_SUBMODULE) >= D_LEVEL_SIZE);\
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D_LEVEL[_D_SUBMODULE_INDEX(D_SUBMODULE)].level >= __l; \
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}); \
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})
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/**
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* d_fnstart - log message at function start if debugging enabled
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*
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* @l: intended debug level
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* @_dev: 'struct device' pointer, NULL if none (for context)
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* @f: printf-like format and arguments
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*/
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#define d_fnstart(l, _dev, f, a...) _d_printf(l, " FNSTART", _dev, f, ## a)
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/**
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* d_fnend - log message at function end if debugging enabled
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*
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* @l: intended debug level
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* @_dev: 'struct device' pointer, NULL if none (for context)
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* @f: printf-like format and arguments
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*/
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#define d_fnend(l, _dev, f, a...) _d_printf(l, " FNEND", _dev, f, ## a)
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/**
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* d_printf - log message if debugging enabled
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*
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* @l: intended debug level
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* @_dev: 'struct device' pointer, NULL if none (for context)
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* @f: printf-like format and arguments
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*/
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#define d_printf(l, _dev, f, a...) _d_printf(l, "", _dev, f, ## a)
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/**
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* d_dump - log buffer hex dump if debugging enabled
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*
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* @l: intended debug level
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* @_dev: 'struct device' pointer, NULL if none (for context)
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* @f: printf-like format and arguments
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*/
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#define d_dump(l, dev, ptr, size) \
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do { \
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char head[64]; \
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if (!d_test(l)) \
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break; \
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__d_head(head, sizeof(head), dev); \
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print_hex_dump(KERN_ERR, head, 0, 16, 1, \
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((void *) ptr), (size), 0); \
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} while (0)
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/**
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* Export a submodule's debug level over debugfs as PREFIXSUBMODULE
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*
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* @prefix: string to prefix the name with
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* @submodule: name of submodule (not a string, just the name)
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* @dentry: debugfs parent dentry
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*
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* Returns: 0 if ok, < 0 errno on error.
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*
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* For removing, just use debugfs_remove_recursive() on the parent.
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*/
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#define d_level_register_debugfs(prefix, name, parent) \
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({ \
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int rc; \
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struct dentry *fd; \
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struct dentry *verify_parent_type = parent; \
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fd = debugfs_create_u8( \
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prefix #name, 0600, verify_parent_type, \
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&(D_LEVEL[__D_SUBMODULE_ ## name].level)); \
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rc = PTR_ERR(fd); \
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if (IS_ERR(fd) && rc != -ENODEV) \
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printk(KERN_ERR "%s: Can't create debugfs entry %s: " \
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"%d\n", __func__, prefix #name, rc); \
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else \
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rc = 0; \
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rc; \
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})
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static inline
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void d_submodule_set(struct d_level *d_level, size_t d_level_size,
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const char *submodule, u8 level, const char *tag)
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{
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struct d_level *itr, *top;
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int index = -1;
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for (itr = d_level, top = itr + d_level_size; itr < top; itr++) {
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index++;
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if (itr->name == NULL) {
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printk(KERN_ERR "%s: itr->name NULL?? (%p, #%d)\n",
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tag, itr, index);
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continue;
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}
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if (!strcmp(itr->name, submodule)) {
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itr->level = level;
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return;
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}
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}
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printk(KERN_ERR "%s: unknown submodule %s\n", tag, submodule);
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}
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/**
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* d_parse_params - Parse a string with debug parameters from the
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* command line
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*
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* @d_level: level structure (D_LEVEL)
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* @d_level_size: number of items in the level structure
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* (D_LEVEL_SIZE).
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* @_params: string with the parameters; this is a space (not tab!)
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* separated list of NAME:VALUE, where value is the debug level
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* and NAME is the name of the submodule.
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* @tag: string for error messages (example: MODULE.ARGNAME).
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*/
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static inline
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void d_parse_params(struct d_level *d_level, size_t d_level_size,
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const char *_params, const char *tag)
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{
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char submodule[130], *params, *params_orig, *token, *colon;
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unsigned level, tokens;
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if (_params == NULL)
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return;
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params_orig = kstrdup(_params, GFP_KERNEL);
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params = params_orig;
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while (1) {
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token = strsep(¶ms, " ");
|
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if (token == NULL)
|
|
break;
|
|
if (*token == '\0') /* eat joint spaces */
|
|
continue;
|
|
/* kernel's sscanf %s eats until whitespace, so we
|
|
* replace : by \n so it doesn't get eaten later by
|
|
* strsep */
|
|
colon = strchr(token, ':');
|
|
if (colon != NULL)
|
|
*colon = '\n';
|
|
tokens = sscanf(token, "%s\n%u", submodule, &level);
|
|
if (colon != NULL)
|
|
*colon = ':'; /* set back, for error messages */
|
|
if (tokens == 2)
|
|
d_submodule_set(d_level, d_level_size,
|
|
submodule, level, tag);
|
|
else
|
|
printk(KERN_ERR "%s: can't parse '%s' as a "
|
|
"SUBMODULE:LEVEL (%d tokens)\n",
|
|
tag, token, tokens);
|
|
}
|
|
kfree(params_orig);
|
|
}
|
|
|
|
#endif /* #ifndef __debug__h__ */
|