2 * Copyright (C) 2016 Red Hat
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
23 * Rob Clark <robdclark@gmail.com>
26 #define DEBUG /* for pr_debug() */
28 #include <linux/stdarg.h>
31 #include <linux/moduleparam.h>
32 #include <linux/seq_file.h>
33 #include <linux/slab.h>
36 #include <drm/drm_drv.h>
37 #include <drm/drm_print.h>
40 * __drm_debug: Enable debug output.
41 * Bitmask of DRM_UT_x. See include/drm/drm_print.h for details.
43 unsigned int __drm_debug;
44 EXPORT_SYMBOL(__drm_debug);
46 MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
47 "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
48 "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
49 "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
50 "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
51 "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
52 "\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n"
53 "\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n"
54 "\t\tBit 8 (0x100) will enable DP messages (displayport code)");
55 module_param_named(debug, __drm_debug, int, 0600);
57 void __drm_puts_coredump(struct drm_printer *p, const char *str)
59 struct drm_print_iterator *iterator = p->arg;
62 if (!iterator->remain)
65 if (iterator->offset < iterator->start) {
70 if (iterator->offset + len <= iterator->start) {
71 iterator->offset += len;
75 copy = len - (iterator->start - iterator->offset);
77 if (copy > iterator->remain)
78 copy = iterator->remain;
80 /* Copy out the bit of the string that we need */
81 memcpy(iterator->data,
82 str + (iterator->start - iterator->offset), copy);
84 iterator->offset = iterator->start + copy;
85 iterator->remain -= copy;
87 ssize_t pos = iterator->offset - iterator->start;
89 len = min_t(ssize_t, strlen(str), iterator->remain);
91 memcpy(iterator->data + pos, str, len);
93 iterator->offset += len;
94 iterator->remain -= len;
97 EXPORT_SYMBOL(__drm_puts_coredump);
99 void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
101 struct drm_print_iterator *iterator = p->arg;
105 if (!iterator->remain)
108 /* Figure out how big the string will be */
109 len = snprintf(NULL, 0, "%pV", vaf);
111 /* This is the easiest path, we've already advanced beyond the offset */
112 if (iterator->offset + len <= iterator->start) {
113 iterator->offset += len;
117 /* Then check if we can directly copy into the target buffer */
118 if ((iterator->offset >= iterator->start) && (len < iterator->remain)) {
119 ssize_t pos = iterator->offset - iterator->start;
121 snprintf(((char *) iterator->data) + pos,
122 iterator->remain, "%pV", vaf);
124 iterator->offset += len;
125 iterator->remain -= len;
131 * Finally, hit the slow path and make a temporary string to copy over
132 * using _drm_puts_coredump
134 buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
138 snprintf(buf, len + 1, "%pV", vaf);
139 __drm_puts_coredump(p, (const char *) buf);
143 EXPORT_SYMBOL(__drm_printfn_coredump);
145 void __drm_puts_seq_file(struct drm_printer *p, const char *str)
147 seq_puts(p->arg, str);
149 EXPORT_SYMBOL(__drm_puts_seq_file);
151 void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
153 seq_printf(p->arg, "%pV", vaf);
155 EXPORT_SYMBOL(__drm_printfn_seq_file);
157 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
159 dev_info(p->arg, "[" DRM_NAME "] %pV", vaf);
161 EXPORT_SYMBOL(__drm_printfn_info);
163 void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
165 pr_debug("%s %pV", p->prefix, vaf);
167 EXPORT_SYMBOL(__drm_printfn_debug);
169 void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
171 pr_err("*ERROR* %s %pV", p->prefix, vaf);
173 EXPORT_SYMBOL(__drm_printfn_err);
176 * drm_puts - print a const string to a &drm_printer stream
177 * @p: the &drm printer
180 * Allow &drm_printer types that have a constant string
183 void drm_puts(struct drm_printer *p, const char *str)
188 drm_printf(p, "%s", str);
190 EXPORT_SYMBOL(drm_puts);
193 * drm_printf - print to a &drm_printer stream
194 * @p: the &drm_printer
197 void drm_printf(struct drm_printer *p, const char *f, ...)
202 drm_vprintf(p, f, &args);
205 EXPORT_SYMBOL(drm_printf);
208 * drm_print_bits - print bits to a &drm_printer stream
210 * Print bits (in flag fields for example) in human readable form.
212 * @p: the &drm_printer
213 * @value: field value.
214 * @bits: Array with bit names.
215 * @nbits: Size of bit names array.
217 void drm_print_bits(struct drm_printer *p, unsigned long value,
218 const char * const bits[], unsigned int nbits)
223 if (WARN_ON_ONCE(nbits > BITS_PER_TYPE(value)))
224 nbits = BITS_PER_TYPE(value);
226 for_each_set_bit(i, &value, nbits) {
227 if (WARN_ON_ONCE(!bits[i]))
229 drm_printf(p, "%s%s", first ? "" : ",",
234 drm_printf(p, "(none)");
236 EXPORT_SYMBOL(drm_print_bits);
238 void drm_dev_printk(const struct device *dev, const char *level,
239 const char *format, ...)
241 struct va_format vaf;
244 va_start(args, format);
249 dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV",
250 __builtin_return_address(0), &vaf);
252 printk("%s" "[" DRM_NAME ":%ps] %pV",
253 level, __builtin_return_address(0), &vaf);
257 EXPORT_SYMBOL(drm_dev_printk);
259 void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
260 const char *format, ...)
262 struct va_format vaf;
265 if (!drm_debug_enabled(category))
268 va_start(args, format);
273 dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV",
274 __builtin_return_address(0), &vaf);
276 printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
277 __builtin_return_address(0), &vaf);
281 EXPORT_SYMBOL(drm_dev_dbg);
283 void __drm_dbg(enum drm_debug_category category, const char *format, ...)
285 struct va_format vaf;
288 if (!drm_debug_enabled(category))
291 va_start(args, format);
295 printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
296 __builtin_return_address(0), &vaf);
300 EXPORT_SYMBOL(__drm_dbg);
302 void __drm_err(const char *format, ...)
304 struct va_format vaf;
307 va_start(args, format);
311 printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
312 __builtin_return_address(0), &vaf);
316 EXPORT_SYMBOL(__drm_err);
319 * drm_print_regset32 - print the contents of registers to a
320 * &drm_printer stream.
322 * @p: the &drm printer
323 * @regset: the list of registers to print.
325 * Often in driver debug, it's useful to be able to either capture the
326 * contents of registers in the steady state using debugfs or at
327 * specific points during operation. This lets the driver have a
328 * single list of registers for both.
330 void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
335 for (i = 0; i < regset->nregs; i++)
336 namelen = max(namelen, (int)strlen(regset->regs[i].name));
338 for (i = 0; i < regset->nregs; i++) {
339 drm_printf(p, "%*s = 0x%08x\n",
340 namelen, regset->regs[i].name,
341 readl(regset->base + regset->regs[i].offset));
344 EXPORT_SYMBOL(drm_print_regset32);