Line data Source code
1 : /*
2 : * Copyright (C) 2016 Red Hat
3 : *
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:
10 : *
11 : * The above copyright notice and this permission notice shall be included in
12 : * all copies or substantial portions of the Software.
13 : *
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.
21 : *
22 : * Authors:
23 : * Rob Clark <robdclark@gmail.com>
24 : */
25 :
26 : #include <linux/stdarg.h>
27 :
28 : #include <linux/io.h>
29 : #include <linux/moduleparam.h>
30 : #include <linux/seq_file.h>
31 : #include <linux/slab.h>
32 : #include <linux/dynamic_debug.h>
33 :
34 : #include <drm/drm.h>
35 : #include <drm/drm_drv.h>
36 : #include <drm/drm_print.h>
37 :
38 : /*
39 : * __drm_debug: Enable debug output.
40 : * Bitmask of DRM_UT_x. See include/drm/drm_print.h for details.
41 : */
42 : unsigned long __drm_debug;
43 : EXPORT_SYMBOL(__drm_debug);
44 :
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)");
54 :
55 : #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
56 : module_param_named(debug, __drm_debug, ulong, 0600);
57 : #else
58 : /* classnames must match vals of enum drm_debug_category */
59 : DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
60 : "DRM_UT_CORE",
61 : "DRM_UT_DRIVER",
62 : "DRM_UT_KMS",
63 : "DRM_UT_PRIME",
64 : "DRM_UT_ATOMIC",
65 : "DRM_UT_VBL",
66 : "DRM_UT_STATE",
67 : "DRM_UT_LEASE",
68 : "DRM_UT_DP",
69 : "DRM_UT_DRMRES");
70 :
71 : static struct ddebug_class_param drm_debug_bitmap = {
72 : .bits = &__drm_debug,
73 : .flags = "p",
74 : .map = &drm_debug_classes,
75 : };
76 : module_param_cb(debug, ¶m_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
77 : #endif
78 :
79 0 : void __drm_puts_coredump(struct drm_printer *p, const char *str)
80 : {
81 0 : struct drm_print_iterator *iterator = p->arg;
82 : ssize_t len;
83 :
84 0 : if (!iterator->remain)
85 : return;
86 :
87 0 : if (iterator->offset < iterator->start) {
88 : ssize_t copy;
89 :
90 0 : len = strlen(str);
91 :
92 0 : if (iterator->offset + len <= iterator->start) {
93 0 : iterator->offset += len;
94 0 : return;
95 : }
96 :
97 0 : copy = len - (iterator->start - iterator->offset);
98 :
99 0 : if (copy > iterator->remain)
100 0 : copy = iterator->remain;
101 :
102 : /* Copy out the bit of the string that we need */
103 0 : memcpy(iterator->data,
104 0 : str + (iterator->start - iterator->offset), copy);
105 :
106 0 : iterator->offset = iterator->start + copy;
107 0 : iterator->remain -= copy;
108 : } else {
109 0 : ssize_t pos = iterator->offset - iterator->start;
110 :
111 0 : len = min_t(ssize_t, strlen(str), iterator->remain);
112 :
113 0 : memcpy(iterator->data + pos, str, len);
114 :
115 0 : iterator->offset += len;
116 0 : iterator->remain -= len;
117 : }
118 : }
119 : EXPORT_SYMBOL(__drm_puts_coredump);
120 :
121 0 : void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
122 : {
123 0 : struct drm_print_iterator *iterator = p->arg;
124 : size_t len;
125 : char *buf;
126 :
127 0 : if (!iterator->remain)
128 : return;
129 :
130 : /* Figure out how big the string will be */
131 0 : len = snprintf(NULL, 0, "%pV", vaf);
132 :
133 : /* This is the easiest path, we've already advanced beyond the offset */
134 0 : if (iterator->offset + len <= iterator->start) {
135 0 : iterator->offset += len;
136 0 : return;
137 : }
138 :
139 : /* Then check if we can directly copy into the target buffer */
140 0 : if ((iterator->offset >= iterator->start) && (len < iterator->remain)) {
141 0 : ssize_t pos = iterator->offset - iterator->start;
142 :
143 0 : snprintf(((char *) iterator->data) + pos,
144 : iterator->remain, "%pV", vaf);
145 :
146 0 : iterator->offset += len;
147 0 : iterator->remain -= len;
148 :
149 0 : return;
150 : }
151 :
152 : /*
153 : * Finally, hit the slow path and make a temporary string to copy over
154 : * using _drm_puts_coredump
155 : */
156 0 : buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
157 0 : if (!buf)
158 : return;
159 :
160 0 : snprintf(buf, len + 1, "%pV", vaf);
161 0 : __drm_puts_coredump(p, (const char *) buf);
162 :
163 0 : kfree(buf);
164 : }
165 : EXPORT_SYMBOL(__drm_printfn_coredump);
166 :
167 0 : void __drm_puts_seq_file(struct drm_printer *p, const char *str)
168 : {
169 0 : seq_puts(p->arg, str);
170 0 : }
171 : EXPORT_SYMBOL(__drm_puts_seq_file);
172 :
173 0 : void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
174 : {
175 0 : seq_printf(p->arg, "%pV", vaf);
176 0 : }
177 : EXPORT_SYMBOL(__drm_printfn_seq_file);
178 :
179 0 : void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
180 : {
181 0 : dev_info(p->arg, "[" DRM_NAME "] %pV", vaf);
182 0 : }
183 : EXPORT_SYMBOL(__drm_printfn_info);
184 :
185 0 : void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
186 : {
187 : /* pr_debug callsite decorations are unhelpful here */
188 0 : printk(KERN_DEBUG "%s %pV", p->prefix, vaf);
189 0 : }
190 : EXPORT_SYMBOL(__drm_printfn_debug);
191 :
192 0 : void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
193 : {
194 0 : pr_err("*ERROR* %s %pV", p->prefix, vaf);
195 0 : }
196 : EXPORT_SYMBOL(__drm_printfn_err);
197 :
198 : /**
199 : * drm_puts - print a const string to a &drm_printer stream
200 : * @p: the &drm printer
201 : * @str: const string
202 : *
203 : * Allow &drm_printer types that have a constant string
204 : * option to use it.
205 : */
206 0 : void drm_puts(struct drm_printer *p, const char *str)
207 : {
208 0 : if (p->puts)
209 0 : p->puts(p, str);
210 : else
211 0 : drm_printf(p, "%s", str);
212 0 : }
213 : EXPORT_SYMBOL(drm_puts);
214 :
215 : /**
216 : * drm_printf - print to a &drm_printer stream
217 : * @p: the &drm_printer
218 : * @f: format string
219 : */
220 0 : void drm_printf(struct drm_printer *p, const char *f, ...)
221 : {
222 : va_list args;
223 :
224 0 : va_start(args, f);
225 0 : drm_vprintf(p, f, &args);
226 0 : va_end(args);
227 0 : }
228 : EXPORT_SYMBOL(drm_printf);
229 :
230 : /**
231 : * drm_print_bits - print bits to a &drm_printer stream
232 : *
233 : * Print bits (in flag fields for example) in human readable form.
234 : *
235 : * @p: the &drm_printer
236 : * @value: field value.
237 : * @bits: Array with bit names.
238 : * @nbits: Size of bit names array.
239 : */
240 0 : void drm_print_bits(struct drm_printer *p, unsigned long value,
241 : const char * const bits[], unsigned int nbits)
242 : {
243 0 : bool first = true;
244 : unsigned int i;
245 :
246 0 : if (WARN_ON_ONCE(nbits > BITS_PER_TYPE(value)))
247 0 : nbits = BITS_PER_TYPE(value);
248 :
249 0 : for_each_set_bit(i, &value, nbits) {
250 0 : if (WARN_ON_ONCE(!bits[i]))
251 0 : continue;
252 0 : drm_printf(p, "%s%s", first ? "" : ",",
253 : bits[i]);
254 0 : first = false;
255 : }
256 0 : if (first)
257 0 : drm_printf(p, "(none)");
258 0 : }
259 : EXPORT_SYMBOL(drm_print_bits);
260 :
261 0 : void drm_dev_printk(const struct device *dev, const char *level,
262 : const char *format, ...)
263 : {
264 : struct va_format vaf;
265 : va_list args;
266 :
267 0 : va_start(args, format);
268 0 : vaf.fmt = format;
269 0 : vaf.va = &args;
270 :
271 0 : if (dev)
272 0 : dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV",
273 : __builtin_return_address(0), &vaf);
274 : else
275 0 : printk("%s" "[" DRM_NAME ":%ps] %pV",
276 : level, __builtin_return_address(0), &vaf);
277 :
278 0 : va_end(args);
279 0 : }
280 : EXPORT_SYMBOL(drm_dev_printk);
281 :
282 890 : void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
283 : enum drm_debug_category category, const char *format, ...)
284 : {
285 : struct va_format vaf;
286 : va_list args;
287 :
288 890 : if (!__drm_debug_enabled(category))
289 890 : return;
290 :
291 : /* we know we are printing for either syslog, tracefs, or both */
292 0 : va_start(args, format);
293 0 : vaf.fmt = format;
294 0 : vaf.va = &args;
295 :
296 0 : if (dev)
297 0 : dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV",
298 : __builtin_return_address(0), &vaf);
299 : else
300 0 : printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
301 : __builtin_return_address(0), &vaf);
302 :
303 0 : va_end(args);
304 : }
305 : EXPORT_SYMBOL(__drm_dev_dbg);
306 :
307 181 : void ___drm_dbg(struct _ddebug *desc, enum drm_debug_category category, const char *format, ...)
308 : {
309 : struct va_format vaf;
310 : va_list args;
311 :
312 181 : if (!__drm_debug_enabled(category))
313 181 : return;
314 :
315 0 : va_start(args, format);
316 0 : vaf.fmt = format;
317 0 : vaf.va = &args;
318 :
319 0 : printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
320 : __builtin_return_address(0), &vaf);
321 :
322 0 : va_end(args);
323 : }
324 : EXPORT_SYMBOL(___drm_dbg);
325 :
326 0 : void __drm_err(const char *format, ...)
327 : {
328 : struct va_format vaf;
329 : va_list args;
330 :
331 0 : va_start(args, format);
332 0 : vaf.fmt = format;
333 0 : vaf.va = &args;
334 :
335 0 : printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
336 : __builtin_return_address(0), &vaf);
337 :
338 0 : va_end(args);
339 0 : }
340 : EXPORT_SYMBOL(__drm_err);
341 :
342 : /**
343 : * drm_print_regset32 - print the contents of registers to a
344 : * &drm_printer stream.
345 : *
346 : * @p: the &drm printer
347 : * @regset: the list of registers to print.
348 : *
349 : * Often in driver debug, it's useful to be able to either capture the
350 : * contents of registers in the steady state using debugfs or at
351 : * specific points during operation. This lets the driver have a
352 : * single list of registers for both.
353 : */
354 0 : void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
355 : {
356 0 : int namelen = 0;
357 : int i;
358 :
359 0 : for (i = 0; i < regset->nregs; i++)
360 0 : namelen = max(namelen, (int)strlen(regset->regs[i].name));
361 :
362 0 : for (i = 0; i < regset->nregs; i++) {
363 0 : drm_printf(p, "%*s = 0x%08x\n",
364 0 : namelen, regset->regs[i].name,
365 0 : readl(regset->base + regset->regs[i].offset));
366 : }
367 0 : }
368 : EXPORT_SYMBOL(drm_print_regset32);
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