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.
26 #include <linux/debugfs.h>
27 #include <linux/dynamic_debug.h>
29 #include <linux/moduleparam.h>
30 #include <linux/seq_file.h>
31 #include <linux/slab.h>
32 #include <linux/stdarg.h>
35 #include <drm/drm_drv.h>
36 #include <drm/drm_print.h>
39 * __drm_debug: Enable debug output.
40 * Bitmask of DRM_UT_x. See include/drm/drm_print.h for details.
42 unsigned long __drm_debug;
43 EXPORT_SYMBOL(__drm_debug);
45 MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
46 "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
47 "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
48 "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
49 "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
50 "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
51 "\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n"
52 "\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n"
53 "\t\tBit 8 (0x100) will enable DP messages (displayport code)");
55 #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
56 module_param_named(debug, __drm_debug, ulong, 0600);
58 /* classnames must match vals of enum drm_debug_category */
59 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
71 static struct ddebug_class_param drm_debug_bitmap = {
74 .map = &drm_debug_classes,
76 module_param_cb(debug, ¶m_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
79 void __drm_puts_coredump(struct drm_printer *p, const char *str)
81 struct drm_print_iterator *iterator = p->arg;
84 if (!iterator->remain)
87 if (iterator->offset < iterator->start) {
92 if (iterator->offset + len <= iterator->start) {
93 iterator->offset += len;
97 copy = len - (iterator->start - iterator->offset);
99 if (copy > iterator->remain)
100 copy = iterator->remain;
102 /* Copy out the bit of the string that we need */
104 memcpy(iterator->data,
105 str + (iterator->start - iterator->offset), copy);
107 iterator->offset = iterator->start + copy;
108 iterator->remain -= copy;
110 ssize_t pos = iterator->offset - iterator->start;
112 len = min_t(ssize_t, strlen(str), iterator->remain);
115 memcpy(iterator->data + pos, str, len);
117 iterator->offset += len;
118 iterator->remain -= len;
121 EXPORT_SYMBOL(__drm_puts_coredump);
123 void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
125 struct drm_print_iterator *iterator = p->arg;
129 if (!iterator->remain)
132 /* Figure out how big the string will be */
133 len = snprintf(NULL, 0, "%pV", vaf);
135 /* This is the easiest path, we've already advanced beyond the offset */
136 if (iterator->offset + len <= iterator->start) {
137 iterator->offset += len;
141 /* Then check if we can directly copy into the target buffer */
142 if ((iterator->offset >= iterator->start) && (len < iterator->remain)) {
143 ssize_t pos = iterator->offset - iterator->start;
146 snprintf(((char *) iterator->data) + pos,
147 iterator->remain, "%pV", vaf);
149 iterator->offset += len;
150 iterator->remain -= len;
156 * Finally, hit the slow path and make a temporary string to copy over
157 * using _drm_puts_coredump
159 buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
163 snprintf(buf, len + 1, "%pV", vaf);
164 __drm_puts_coredump(p, (const char *) buf);
168 EXPORT_SYMBOL(__drm_printfn_coredump);
170 void __drm_puts_seq_file(struct drm_printer *p, const char *str)
172 seq_puts(p->arg, str);
174 EXPORT_SYMBOL(__drm_puts_seq_file);
176 void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
178 seq_printf(p->arg, "%pV", vaf);
180 EXPORT_SYMBOL(__drm_printfn_seq_file);
182 static void __drm_dev_vprintk(const struct device *dev, const char *level,
183 const void *origin, const char *prefix,
184 struct va_format *vaf)
186 const char *prefix_pad = prefix ? " " : "";
193 dev_printk(level, dev, "[" DRM_NAME ":%ps]%s%s %pV",
194 origin, prefix_pad, prefix, vaf);
196 dev_printk(level, dev, "[" DRM_NAME "]%s%s %pV",
197 prefix_pad, prefix, vaf);
200 printk("%s" "[" DRM_NAME ":%ps]%s%s %pV",
201 level, origin, prefix_pad, prefix, vaf);
203 printk("%s" "[" DRM_NAME "]%s%s %pV",
204 level, prefix_pad, prefix, vaf);
208 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
210 dev_info(p->arg, "[" DRM_NAME "] %pV", vaf);
212 EXPORT_SYMBOL(__drm_printfn_info);
214 void __drm_printfn_dbg(struct drm_printer *p, struct va_format *vaf)
216 const struct drm_device *drm = p->arg;
217 const struct device *dev = drm ? drm->dev : NULL;
218 enum drm_debug_category category = p->category;
220 if (!__drm_debug_enabled(category))
223 __drm_dev_vprintk(dev, KERN_DEBUG, p->origin, p->prefix, vaf);
225 EXPORT_SYMBOL(__drm_printfn_dbg);
227 void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
229 struct drm_device *drm = p->arg;
232 drm_err(drm, "%s %pV", p->prefix, vaf);
234 drm_err(drm, "%pV", vaf);
236 EXPORT_SYMBOL(__drm_printfn_err);
238 void __drm_printfn_line(struct drm_printer *p, struct va_format *vaf)
240 unsigned int counter = ++p->line.counter;
241 const char *prefix = p->prefix ?: "";
242 const char *pad = p->prefix ? " " : "";
245 drm_printf(p->arg, "%s%s%u.%u: %pV",
246 prefix, pad, p->line.series, counter, vaf);
248 drm_printf(p->arg, "%s%s%u: %pV", prefix, pad, counter, vaf);
250 EXPORT_SYMBOL(__drm_printfn_line);
253 * drm_puts - print a const string to a &drm_printer stream
254 * @p: the &drm printer
257 * Allow &drm_printer types that have a constant string
260 void drm_puts(struct drm_printer *p, const char *str)
265 drm_printf(p, "%s", str);
267 EXPORT_SYMBOL(drm_puts);
270 * drm_printf - print to a &drm_printer stream
271 * @p: the &drm_printer
274 void drm_printf(struct drm_printer *p, const char *f, ...)
279 drm_vprintf(p, f, &args);
282 EXPORT_SYMBOL(drm_printf);
285 * drm_print_bits - print bits to a &drm_printer stream
287 * Print bits (in flag fields for example) in human readable form.
289 * @p: the &drm_printer
290 * @value: field value.
291 * @bits: Array with bit names.
292 * @nbits: Size of bit names array.
294 void drm_print_bits(struct drm_printer *p, unsigned long value,
295 const char * const bits[], unsigned int nbits)
300 if (WARN_ON_ONCE(nbits > BITS_PER_TYPE(value)))
301 nbits = BITS_PER_TYPE(value);
303 for_each_set_bit(i, &value, nbits) {
304 if (WARN_ON_ONCE(!bits[i]))
306 drm_printf(p, "%s%s", first ? "" : ",",
311 drm_printf(p, "(none)");
313 EXPORT_SYMBOL(drm_print_bits);
315 void drm_dev_printk(const struct device *dev, const char *level,
316 const char *format, ...)
318 struct va_format vaf;
321 va_start(args, format);
325 __drm_dev_vprintk(dev, level, __builtin_return_address(0), NULL, &vaf);
329 EXPORT_SYMBOL(drm_dev_printk);
331 void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
332 enum drm_debug_category category, const char *format, ...)
334 struct va_format vaf;
337 if (!__drm_debug_enabled(category))
340 /* we know we are printing for either syslog, tracefs, or both */
341 va_start(args, format);
345 __drm_dev_vprintk(dev, KERN_DEBUG, __builtin_return_address(0), NULL, &vaf);
349 EXPORT_SYMBOL(__drm_dev_dbg);
351 void __drm_err(const char *format, ...)
353 struct va_format vaf;
356 va_start(args, format);
360 __drm_dev_vprintk(NULL, KERN_ERR, __builtin_return_address(0), "*ERROR*", &vaf);
364 EXPORT_SYMBOL(__drm_err);
367 * drm_print_regset32 - print the contents of registers to a
368 * &drm_printer stream.
370 * @p: the &drm printer
371 * @regset: the list of registers to print.
373 * Often in driver debug, it's useful to be able to either capture the
374 * contents of registers in the steady state using debugfs or at
375 * specific points during operation. This lets the driver have a
376 * single list of registers for both.
378 void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
383 for (i = 0; i < regset->nregs; i++)
384 namelen = max(namelen, (int)strlen(regset->regs[i].name));
386 for (i = 0; i < regset->nregs; i++) {
387 drm_printf(p, "%*s = 0x%08x\n",
388 namelen, regset->regs[i].name,
389 readl(regset->base + regset->regs[i].offset));
392 EXPORT_SYMBOL(drm_print_regset32);
395 * drm_print_hex_dump - print a hex dump to a &drm_printer stream
396 * @p: The &drm_printer
397 * @prefix: Prefix for each line, may be NULL for no prefix
398 * @buf: Buffer to dump
399 * @len: Length of buffer
401 * Print hex dump to &drm_printer, with 16 space-separated hex bytes per line,
402 * optionally with a prefix on each line. No separator is added after prefix.
404 void drm_print_hex_dump(struct drm_printer *p, const char *prefix,
405 const u8 *buf, size_t len)
409 for (i = 0; i < len; i += 16) {
410 int bytes_per_line = min(16, len - i);
412 drm_printf(p, "%s%*ph\n", prefix ?: "", bytes_per_line, buf + i);
415 EXPORT_SYMBOL(drm_print_hex_dump);