Commit d8187177 authored by Rob Clark's avatar Rob Clark Committed by Sean Paul

drm: add helper for printing to log or seq_file

Sometimes it is nice not to duplicate equivalent printk() and
seq_printf() code.

v2: simplify things w/ va_format, and use dev_printk, docs
Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1478358492-30738-3-git-send-email-robdclark@gmail.com
parent 65c7dc18
......@@ -350,6 +350,23 @@ how the ioctl is allowed to be called.
.. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
:export:
Misc Utilities
==============
Printer
-------
.. kernel-doc:: include/drm/drm_print.h
:doc: print
.. kernel-doc:: include/drm/drm_print.h
:internal:
.. kernel-doc:: include/drm/drm_print.h
:export:
Legacy Support Code
===================
......
......@@ -15,7 +15,7 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \
drm_modeset_lock.o drm_atomic.o drm_bridge.o \
drm_framebuffer.o drm_connector.o drm_blend.o \
drm_encoder.o drm_mode_object.o drm_property.o \
drm_plane.o drm_color_mgmt.o
drm_plane.o drm_color_mgmt.o drm_print.o
drm-$(CONFIG_COMPAT) += drm_ioc32.o
drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
......
/*
* Copyright (C) 2016 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rob Clark <robdclark@gmail.com>
*/
#include <stdarg.h>
#include <linux/seq_file.h>
#include <drm/drmP.h>
#include <drm/drm_print.h>
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
{
seq_printf(p->arg, "%pV", vaf);
}
EXPORT_SYMBOL(__drm_printfn_seq_file);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
{
dev_printk(KERN_INFO, p->arg, "[" DRM_NAME "] %pV", vaf);
}
EXPORT_SYMBOL(__drm_printfn_info);
void drm_printf(struct drm_printer *p, const char *f, ...)
{
struct va_format vaf;
va_list args;
va_start(args, f);
vaf.fmt = f;
vaf.va = &args;
p->printfn(p, &vaf);
va_end(args);
}
EXPORT_SYMBOL(drm_printf);
/*
* Copyright (C) 2016 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rob Clark <robdclark@gmail.com>
*/
#ifndef DRM_PRINT_H_
#define DRM_PRINT_H_
#include <linux/seq_file.h>
#include <linux/device.h>
/**
* DOC: print
*
* A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
* debug code to be used for both debugfs and printk logging.
*
* For example::
*
* void log_some_info(struct drm_printer *p)
* {
* drm_printf(p, "foo=%d\n", foo);
* drm_printf(p, "bar=%d\n", bar);
* }
*
* #ifdef CONFIG_DEBUG_FS
* void debugfs_show(struct seq_file *f)
* {
* struct drm_printer p = drm_seq_file_printer(f);
* log_some_info(&p);
* }
* #endif
*
* void some_other_function(...)
* {
* struct drm_printer p = drm_info_printer(drm->dev);
* log_some_info(&p);
* }
*/
/**
* struct drm_printer - drm output "stream"
* @printfn: actual output fxn
* @arg: output fxn specific data
*
* Do not use struct members directly. Use drm_printer_seq_file(),
* drm_printer_info(), etc to initialize. And drm_printf() for output.
*/
struct drm_printer {
void (*printfn)(struct drm_printer *p, struct va_format *vaf);
void *arg;
};
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
/**
* drm_printf - print to a &drm_printer stream
* @p: the &drm_printer
* @f: format string
*/
void drm_printf(struct drm_printer *p, const char *f, ...);
/**
* drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
* @f: the struct &seq_file to output to
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
{
struct drm_printer p = {
.printfn = __drm_printfn_seq_file,
.arg = f,
};
return p;
}
/**
* drm_info_printer - construct a &drm_printer that outputs to dev_printk()
* @dev: the struct &device pointer
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_info_printer(struct device *dev)
{
struct drm_printer p = {
.printfn = __drm_printfn_info,
.arg = dev,
};
return p;
}
#endif /* DRM_PRINT_H_ */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment