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 #ifdef __linux__ 27 #define DEBUG /* for pr_debug() */ 28 #endif 29 30 #include <sys/stdarg.h> 31 #include <linux/seq_file.h> 32 #include <drm/drmP.h> 33 #include <drm/drm_print.h> 34 35 void __drm_puts_coredump(struct drm_printer *p, const char *str) 36 { 37 struct drm_print_iterator *iterator = p->arg; 38 ssize_t len; 39 40 if (!iterator->remain) 41 return; 42 43 if (iterator->offset < iterator->start) { 44 ssize_t copy; 45 46 len = strlen(str); 47 48 if (iterator->offset + len <= iterator->start) { 49 iterator->offset += len; 50 return; 51 } 52 53 copy = len - (iterator->start - iterator->offset); 54 55 if (copy > iterator->remain) 56 copy = iterator->remain; 57 58 /* Copy out the bit of the string that we need */ 59 memcpy(iterator->data, 60 str + (iterator->start - iterator->offset), copy); 61 62 iterator->offset = iterator->start + copy; 63 iterator->remain -= copy; 64 } else { 65 ssize_t pos = iterator->offset - iterator->start; 66 67 len = min_t(ssize_t, strlen(str), iterator->remain); 68 69 memcpy(iterator->data + pos, str, len); 70 71 iterator->offset += len; 72 iterator->remain -= len; 73 } 74 } 75 EXPORT_SYMBOL(__drm_puts_coredump); 76 77 void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf) 78 { 79 struct drm_print_iterator *iterator = p->arg; 80 size_t len; 81 char *buf; 82 83 if (!iterator->remain) 84 return; 85 86 /* Figure out how big the string will be */ 87 len = snprintf(NULL, 0, "%pV", vaf); 88 89 /* This is the easiest path, we've already advanced beyond the offset */ 90 if (iterator->offset + len <= iterator->start) { 91 iterator->offset += len; 92 return; 93 } 94 95 /* Then check if we can directly copy into the target buffer */ 96 if ((iterator->offset >= iterator->start) && (len < iterator->remain)) { 97 ssize_t pos = iterator->offset - iterator->start; 98 99 snprintf(((char *) iterator->data) + pos, 100 iterator->remain, "%pV", vaf); 101 102 iterator->offset += len; 103 iterator->remain -= len; 104 105 return; 106 } 107 108 /* 109 * Finally, hit the slow path and make a temporary string to copy over 110 * using _drm_puts_coredump 111 */ 112 buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); 113 if (!buf) 114 return; 115 116 snprintf(buf, len + 1, "%pV", vaf); 117 __drm_puts_coredump(p, (const char *) buf); 118 119 kfree(buf); 120 } 121 EXPORT_SYMBOL(__drm_printfn_coredump); 122 123 void __drm_puts_seq_file(struct drm_printer *p, const char *str) 124 { 125 seq_puts(p->arg, str); 126 } 127 EXPORT_SYMBOL(__drm_puts_seq_file); 128 129 void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf) 130 { 131 seq_printf(p->arg, "%pV", vaf); 132 } 133 EXPORT_SYMBOL(__drm_printfn_seq_file); 134 135 #ifdef __linux__ 136 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf) 137 { 138 dev_info(p->arg, "[" DRM_NAME "] %pV", vaf); 139 } 140 EXPORT_SYMBOL(__drm_printfn_info); 141 142 void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf) 143 { 144 pr_debug("%s %pV", p->prefix, vaf); 145 } 146 EXPORT_SYMBOL(__drm_printfn_debug); 147 #else 148 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf) 149 { 150 #ifdef DRMDEBUG 151 printf("[" DRM_NAME "] "); 152 vprintf(vaf->fmt, *vaf->va); 153 #endif 154 } 155 156 void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf) 157 { 158 #ifdef DRMDEBUG 159 printf("%s ", p->prefix); 160 vprintf(vaf->fmt, *vaf->va); 161 #endif 162 } 163 #endif 164 165 /** 166 * drm_puts - print a const string to a &drm_printer stream 167 * @p: the &drm printer 168 * @str: const string 169 * 170 * Allow &drm_printer types that have a constant string 171 * option to use it. 172 */ 173 void drm_puts(struct drm_printer *p, const char *str) 174 { 175 if (p->puts) 176 p->puts(p, str); 177 else 178 drm_printf(p, "%s", str); 179 } 180 EXPORT_SYMBOL(drm_puts); 181 182 /** 183 * drm_printf - print to a &drm_printer stream 184 * @p: the &drm_printer 185 * @f: format string 186 */ 187 void drm_printf(struct drm_printer *p, const char *f, ...) 188 { 189 va_list args; 190 191 va_start(args, f); 192 drm_vprintf(p, f, &args); 193 va_end(args); 194 } 195 EXPORT_SYMBOL(drm_printf); 196 197 #ifdef __linux__ 198 void drm_dev_printk(const struct device *dev, const char *level, 199 const char *format, ...) 200 { 201 struct va_format vaf; 202 va_list args; 203 204 va_start(args, format); 205 vaf.fmt = format; 206 vaf.va = &args; 207 208 if (dev) 209 dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV", 210 __builtin_return_address(0), &vaf); 211 else 212 printk("%s" "[" DRM_NAME ":%ps] %pV", 213 level, __builtin_return_address(0), &vaf); 214 215 va_end(args); 216 } 217 EXPORT_SYMBOL(drm_dev_printk); 218 219 void drm_dev_dbg(const struct device *dev, unsigned int category, 220 const char *format, ...) 221 { 222 struct va_format vaf; 223 va_list args; 224 225 if (!(drm_debug & category)) 226 return; 227 228 va_start(args, format); 229 vaf.fmt = format; 230 vaf.va = &args; 231 232 if (dev) 233 dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV", 234 __builtin_return_address(0), &vaf); 235 else 236 printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV", 237 __builtin_return_address(0), &vaf); 238 239 va_end(args); 240 } 241 EXPORT_SYMBOL(drm_dev_dbg); 242 243 void drm_dbg(unsigned int category, const char *format, ...) 244 { 245 struct va_format vaf; 246 va_list args; 247 248 if (!(drm_debug & category)) 249 return; 250 251 va_start(args, format); 252 vaf.fmt = format; 253 vaf.va = &args; 254 255 printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV", 256 __builtin_return_address(0), &vaf); 257 258 va_end(args); 259 } 260 EXPORT_SYMBOL(drm_dbg); 261 262 void drm_err(const char *format, ...) 263 { 264 struct va_format vaf; 265 va_list args; 266 267 va_start(args, format); 268 vaf.fmt = format; 269 vaf.va = &args; 270 271 printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV", 272 __builtin_return_address(0), &vaf); 273 274 va_end(args); 275 } 276 EXPORT_SYMBOL(drm_err); 277 278 #else 279 280 void drm_dev_printk(const struct device *dev, const char *level, 281 const char *format, ...) 282 { 283 va_list args; 284 285 va_start(args, format); 286 printk("%s" "[" DRM_NAME "] ", level); 287 vprintf(format, args); 288 va_end(args); 289 } 290 291 void drm_dev_dbg(const struct device *dev, unsigned int category, 292 const char *format, ...) 293 { 294 va_list args; 295 296 if (!(drm_debug & category)) 297 return; 298 299 va_start(args, format); 300 printf(KERN_DEBUG "[" DRM_NAME "] "); 301 vprintf(format, args); 302 va_end(args); 303 } 304 305 void drm_dbg(unsigned int category, const char *format, ...) 306 { 307 va_list args; 308 309 if (!(drm_debug & category)) 310 return; 311 312 va_start(args, format); 313 printf(KERN_DEBUG "[" DRM_NAME "] "); 314 vprintf(format, args); 315 va_end(args); 316 } 317 318 void drm_err(const char *format, ...) 319 { 320 va_list args; 321 322 va_start(args, format); 323 printf(KERN_ERR "[" DRM_NAME "] *ERROR* "); 324 vprintf(format, args); 325 va_end(args); 326 } 327 #endif 328