forked from mirrors/linux
5f513cc89e
The debugfs_regset32 is nice to use for reducing boilerplate in dumping a bunch of regs in debugfs, but we also want to be able to print to dmesg them at runtime for driver debugging. drm_printer lets us format debugfs and the printk the same way. v2: Add some kerneldoc for the function (requested by danvet) Signed-off-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20190220210343.28157-1-eric@anholt.net Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> (v1) Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
428 lines
12 KiB
C
428 lines
12 KiB
C
/*
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* Copyright (C) 2016 Red Hat
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rob Clark <robdclark@gmail.com>
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*/
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#ifndef DRM_PRINT_H_
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#define DRM_PRINT_H_
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#include <linux/compiler.h>
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#include <linux/printk.h>
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#include <linux/seq_file.h>
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#include <linux/device.h>
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#include <linux/debugfs.h>
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/**
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* DOC: print
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*
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* A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
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* debug code to be used for both debugfs and printk logging.
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*
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* For example::
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*
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* void log_some_info(struct drm_printer *p)
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* {
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* drm_printf(p, "foo=%d\n", foo);
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* drm_printf(p, "bar=%d\n", bar);
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* }
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*
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* #ifdef CONFIG_DEBUG_FS
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* void debugfs_show(struct seq_file *f)
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* {
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* struct drm_printer p = drm_seq_file_printer(f);
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* log_some_info(&p);
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* }
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* #endif
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*
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* void some_other_function(...)
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* {
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* struct drm_printer p = drm_info_printer(drm->dev);
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* log_some_info(&p);
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* }
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*/
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/**
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* struct drm_printer - drm output "stream"
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*
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* Do not use struct members directly. Use drm_printer_seq_file(),
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* drm_printer_info(), etc to initialize. And drm_printf() for output.
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*/
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struct drm_printer {
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/* private: */
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void (*printfn)(struct drm_printer *p, struct va_format *vaf);
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void (*puts)(struct drm_printer *p, const char *str);
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void *arg;
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const char *prefix;
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};
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void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf);
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void __drm_puts_coredump(struct drm_printer *p, const char *str);
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void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
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void __drm_puts_seq_file(struct drm_printer *p, const char *str);
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void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
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void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
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__printf(2, 3)
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void drm_printf(struct drm_printer *p, const char *f, ...);
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void drm_puts(struct drm_printer *p, const char *str);
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void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
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__printf(2, 0)
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/**
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* drm_vprintf - print to a &drm_printer stream
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* @p: the &drm_printer
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* @fmt: format string
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* @va: the va_list
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*/
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static inline void
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drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
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{
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struct va_format vaf = { .fmt = fmt, .va = va };
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p->printfn(p, &vaf);
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}
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/**
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* drm_printf_indent - Print to a &drm_printer stream with indentation
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* @printer: DRM printer
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* @indent: Tab indentation level (max 5)
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* @fmt: Format string
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*/
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#define drm_printf_indent(printer, indent, fmt, ...) \
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drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
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/**
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* struct drm_print_iterator - local struct used with drm_printer_coredump
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* @data: Pointer to the devcoredump output buffer
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* @start: The offset within the buffer to start writing
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* @remain: The number of bytes to write for this iteration
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*/
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struct drm_print_iterator {
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void *data;
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ssize_t start;
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ssize_t remain;
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/* private: */
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ssize_t offset;
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};
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/**
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* drm_coredump_printer - construct a &drm_printer that can output to a buffer
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* from the read function for devcoredump
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* @iter: A pointer to a struct drm_print_iterator for the read instance
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*
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* This wrapper extends drm_printf() to work with a dev_coredumpm() callback
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* function. The passed in drm_print_iterator struct contains the buffer
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* pointer, size and offset as passed in from devcoredump.
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*
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* For example::
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*
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* void coredump_read(char *buffer, loff_t offset, size_t count,
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* void *data, size_t datalen)
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* {
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* struct drm_print_iterator iter;
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* struct drm_printer p;
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*
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* iter.data = buffer;
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* iter.start = offset;
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* iter.remain = count;
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*
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* p = drm_coredump_printer(&iter);
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*
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* drm_printf(p, "foo=%d\n", foo);
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* }
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*
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* void makecoredump(...)
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* {
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* ...
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* dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL,
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* coredump_read, ...)
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* }
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer
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drm_coredump_printer(struct drm_print_iterator *iter)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_coredump,
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.puts = __drm_puts_coredump,
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.arg = iter,
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};
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/* Set the internal offset of the iterator to zero */
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iter->offset = 0;
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return p;
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}
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/**
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* drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
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* @f: the &struct seq_file to output to
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_seq_file,
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.puts = __drm_puts_seq_file,
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.arg = f,
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};
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return p;
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}
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/**
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* drm_info_printer - construct a &drm_printer that outputs to dev_printk()
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* @dev: the &struct device pointer
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer drm_info_printer(struct device *dev)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_info,
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.arg = dev,
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};
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return p;
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}
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/**
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* drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
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* @prefix: debug output prefix
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer drm_debug_printer(const char *prefix)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_debug,
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.prefix = prefix
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};
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return p;
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}
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/*
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* The following categories are defined:
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*
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* CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
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* This is the category used by the DRM_DEBUG() macro.
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*
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* DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
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* This is the category used by the DRM_DEBUG_DRIVER() macro.
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*
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* KMS: used in the modesetting code.
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* This is the category used by the DRM_DEBUG_KMS() macro.
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*
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* PRIME: used in the prime code.
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* This is the category used by the DRM_DEBUG_PRIME() macro.
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*
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* ATOMIC: used in the atomic code.
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* This is the category used by the DRM_DEBUG_ATOMIC() macro.
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*
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* VBL: used for verbose debug message in the vblank code
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* This is the category used by the DRM_DEBUG_VBL() macro.
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*
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* Enabling verbose debug messages is done through the drm.debug parameter,
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* each category being enabled by a bit.
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*
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* drm.debug=0x1 will enable CORE messages
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* drm.debug=0x2 will enable DRIVER messages
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* drm.debug=0x3 will enable CORE and DRIVER messages
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* ...
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* drm.debug=0x3f will enable all messages
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*
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* An interesting feature is that it's possible to enable verbose logging at
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* run-time by echoing the debug value in its sysfs node:
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* # echo 0xf > /sys/module/drm/parameters/debug
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*/
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#define DRM_UT_NONE 0x00
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#define DRM_UT_CORE 0x01
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#define DRM_UT_DRIVER 0x02
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#define DRM_UT_KMS 0x04
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#define DRM_UT_PRIME 0x08
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#define DRM_UT_ATOMIC 0x10
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#define DRM_UT_VBL 0x20
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#define DRM_UT_STATE 0x40
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#define DRM_UT_LEASE 0x80
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#define DRM_UT_DP 0x100
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__printf(3, 4)
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void drm_dev_printk(const struct device *dev, const char *level,
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const char *format, ...);
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__printf(3, 4)
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void drm_dev_dbg(const struct device *dev, unsigned int category,
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const char *format, ...);
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__printf(2, 3)
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void drm_dbg(unsigned int category, const char *format, ...);
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__printf(1, 2)
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void drm_err(const char *format, ...);
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/* Macros to make printk easier */
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#define _DRM_PRINTK(once, level, fmt, ...) \
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printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
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#define DRM_INFO(fmt, ...) \
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_DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
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#define DRM_NOTE(fmt, ...) \
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_DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
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#define DRM_WARN(fmt, ...) \
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_DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
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#define DRM_INFO_ONCE(fmt, ...) \
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_DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
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#define DRM_NOTE_ONCE(fmt, ...) \
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_DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
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#define DRM_WARN_ONCE(fmt, ...) \
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_DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
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/**
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* Error output.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_ERROR(dev, fmt, ...) \
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drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
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#define DRM_ERROR(fmt, ...) \
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drm_err(fmt, ##__VA_ARGS__)
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/**
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* Rate limited error output. Like DRM_ERROR() but won't flood the log.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
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({ \
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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\
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if (__ratelimit(&_rs)) \
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DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
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})
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#define DRM_ERROR_RATELIMITED(fmt, ...) \
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DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_INFO(dev, fmt, ...) \
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drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
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#define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
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({ \
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static bool __print_once __read_mostly; \
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if (!__print_once) { \
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__print_once = true; \
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DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
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} \
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})
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/**
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* Debug output.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_DEBUG(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG(fmt, ...) \
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drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_DRIVER(fmt, ...) \
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drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_KMS(fmt, ...) \
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drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_PRIME(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_PRIME(fmt, ...) \
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drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_ATOMIC(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_ATOMIC(fmt, ...) \
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drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_VBL(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_VBL, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_VBL(fmt, ...) \
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drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_LEASE(fmt, ...) \
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drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_DP(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_DP, fmt, ## __VA_ARGS__)
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#define DRM_DEBUG_DP(fmt, ...) \
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drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)
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#define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, category, fmt, ...) \
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({ \
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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if (__ratelimit(&_rs)) \
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drm_dev_dbg(dev, category, fmt, ##__VA_ARGS__); \
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})
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/**
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* Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, ...) \
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_DEV_DRM_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_CORE, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, ...) \
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_DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_DRIVER, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_DRIVER_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, ...) \
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_DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_KMS, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, ...) \
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_DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_PRIME, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_PRIME_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#endif /* DRM_PRINT_H_ */
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