256 строки
5.9 KiB
C
256 строки
5.9 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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#define DEBUG /* for pr_debug() */
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#include <stdarg.h>
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#include <linux/seq_file.h>
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#include <drm/drmP.h>
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#include <drm/drm_print.h>
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void __drm_puts_coredump(struct drm_printer *p, const char *str)
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{
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struct drm_print_iterator *iterator = p->arg;
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ssize_t len;
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if (!iterator->remain)
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return;
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if (iterator->offset < iterator->start) {
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ssize_t copy;
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len = strlen(str);
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if (iterator->offset + len <= iterator->start) {
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iterator->offset += len;
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return;
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}
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copy = len - (iterator->start - iterator->offset);
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if (copy > iterator->remain)
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copy = iterator->remain;
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/* Copy out the bit of the string that we need */
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memcpy(iterator->data,
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str + (iterator->start - iterator->offset), copy);
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iterator->offset = iterator->start + copy;
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iterator->remain -= copy;
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} else {
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ssize_t pos = iterator->offset - iterator->start;
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len = min_t(ssize_t, strlen(str), iterator->remain);
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memcpy(iterator->data + pos, str, len);
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iterator->offset += len;
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iterator->remain -= len;
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}
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}
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EXPORT_SYMBOL(__drm_puts_coredump);
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void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
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{
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struct drm_print_iterator *iterator = p->arg;
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size_t len;
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char *buf;
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if (!iterator->remain)
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return;
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/* Figure out how big the string will be */
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len = snprintf(NULL, 0, "%pV", vaf);
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/* This is the easiest path, we've already advanced beyond the offset */
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if (iterator->offset + len <= iterator->start) {
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iterator->offset += len;
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return;
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}
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/* Then check if we can directly copy into the target buffer */
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if ((iterator->offset >= iterator->start) && (len < iterator->remain)) {
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ssize_t pos = iterator->offset - iterator->start;
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snprintf(((char *) iterator->data) + pos,
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iterator->remain, "%pV", vaf);
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iterator->offset += len;
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iterator->remain -= len;
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return;
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}
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/*
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* Finally, hit the slow path and make a temporary string to copy over
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* using _drm_puts_coredump
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*/
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buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
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if (!buf)
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return;
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snprintf(buf, len + 1, "%pV", vaf);
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__drm_puts_coredump(p, (const char *) buf);
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kfree(buf);
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}
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EXPORT_SYMBOL(__drm_printfn_coredump);
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void __drm_puts_seq_file(struct drm_printer *p, const char *str)
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{
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seq_puts(p->arg, str);
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}
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EXPORT_SYMBOL(__drm_puts_seq_file);
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void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
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{
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seq_printf(p->arg, "%pV", vaf);
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}
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EXPORT_SYMBOL(__drm_printfn_seq_file);
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void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
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{
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dev_info(p->arg, "[" DRM_NAME "] %pV", vaf);
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}
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EXPORT_SYMBOL(__drm_printfn_info);
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void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
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{
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pr_debug("%s %pV", p->prefix, vaf);
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}
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EXPORT_SYMBOL(__drm_printfn_debug);
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/**
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* drm_puts - print a const string to a &drm_printer stream
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* @p: the &drm printer
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* @str: const string
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*
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* Allow &drm_printer types that have a constant string
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* option to use it.
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*/
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void drm_puts(struct drm_printer *p, const char *str)
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{
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if (p->puts)
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p->puts(p, str);
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else
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drm_printf(p, "%s", str);
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}
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EXPORT_SYMBOL(drm_puts);
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/**
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* drm_printf - print to a &drm_printer stream
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* @p: the &drm_printer
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* @f: format string
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*/
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void drm_printf(struct drm_printer *p, const char *f, ...)
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{
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va_list args;
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va_start(args, f);
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drm_vprintf(p, f, &args);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_printf);
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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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{
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struct va_format vaf;
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va_list args;
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va_start(args, format);
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vaf.fmt = format;
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vaf.va = &args;
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if (dev)
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dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV",
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__builtin_return_address(0), &vaf);
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else
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printk("%s" "[" DRM_NAME ":%ps] %pV",
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level, __builtin_return_address(0), &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_dev_printk);
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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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{
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struct va_format vaf;
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va_list args;
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if (!(drm_debug & category))
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return;
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va_start(args, format);
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vaf.fmt = format;
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vaf.va = &args;
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if (dev)
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dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV",
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__builtin_return_address(0), &vaf);
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else
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printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
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__builtin_return_address(0), &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_dev_dbg);
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void drm_dbg(unsigned int category, const char *format, ...)
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{
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struct va_format vaf;
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va_list args;
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if (!(drm_debug & category))
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return;
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va_start(args, format);
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vaf.fmt = format;
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vaf.va = &args;
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printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
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__builtin_return_address(0), &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_dbg);
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void drm_err(const char *format, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, format);
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vaf.fmt = format;
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vaf.va = &args;
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printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
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__builtin_return_address(0), &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL(drm_err);
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