Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/fs/pstore/ram.c

  1 /*
  2  * RAM Oops/Panic logger
  3  *
  4  * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
  5  * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * version 2 as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful, but
 12  * WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14  * General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 19  * 02110-1301 USA
 20  *
 21  */
 22 
 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/err.h>
 27 #include <linux/module.h>
 28 #include <linux/version.h>
 29 #include <linux/pstore.h>
 30 #include <linux/time.h>
 31 #include <linux/io.h>
 32 #include <linux/ioport.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/slab.h>
 35 #include <linux/compiler.h>
 36 #include <linux/pstore_ram.h>
 37 #include <linux/of.h>
 38 #include <linux/of_address.h>
 39 
 40 #define RAMOOPS_KERNMSG_HDR "===="
 41 #define MIN_MEM_SIZE 4096UL
 42 
 43 static ulong record_size = MIN_MEM_SIZE;
 44 module_param(record_size, ulong, 0400);
 45 MODULE_PARM_DESC(record_size,
 46                 "size of each dump done on oops/panic");
 47 
 48 static ulong ramoops_console_size = MIN_MEM_SIZE;
 49 module_param_named(console_size, ramoops_console_size, ulong, 0400);
 50 MODULE_PARM_DESC(console_size, "size of kernel console log");
 51 
 52 static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
 53 module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
 54 MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
 55 
 56 static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
 57 module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
 58 MODULE_PARM_DESC(pmsg_size, "size of user space message log");
 59 
 60 static unsigned long long mem_address;
 61 module_param(mem_address, ullong, 0400);
 62 MODULE_PARM_DESC(mem_address,
 63                 "start of reserved RAM used to store oops/panic logs");
 64 
 65 static ulong mem_size;
 66 module_param(mem_size, ulong, 0400);
 67 MODULE_PARM_DESC(mem_size,
 68                 "size of reserved RAM used to store oops/panic logs");
 69 
 70 static unsigned int mem_type;
 71 module_param(mem_type, uint, 0600);
 72 MODULE_PARM_DESC(mem_type,
 73                 "set to 1 to try to use unbuffered memory (default 0)");
 74 
 75 static int dump_oops = 1;
 76 module_param(dump_oops, int, 0600);
 77 MODULE_PARM_DESC(dump_oops,
 78                 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
 79 
 80 static int ramoops_ecc;
 81 module_param_named(ecc, ramoops_ecc, int, 0600);
 82 MODULE_PARM_DESC(ramoops_ecc,
 83                 "if non-zero, the option enables ECC support and specifies "
 84                 "ECC buffer size in bytes (1 is a special value, means 16 "
 85                 "bytes ECC)");
 86 
 87 struct ramoops_context {
 88         struct persistent_ram_zone **przs;
 89         struct persistent_ram_zone *cprz;
 90         struct persistent_ram_zone *fprz;
 91         struct persistent_ram_zone *mprz;
 92         phys_addr_t phys_addr;
 93         unsigned long size;
 94         unsigned int memtype;
 95         size_t record_size;
 96         size_t console_size;
 97         size_t ftrace_size;
 98         size_t pmsg_size;
 99         int dump_oops;
100         struct persistent_ram_ecc_info ecc_info;
101         unsigned int max_dump_cnt;
102         unsigned int dump_write_cnt;
103         /* _read_cnt need clear on ramoops_pstore_open */
104         unsigned int dump_read_cnt;
105         unsigned int console_read_cnt;
106         unsigned int ftrace_read_cnt;
107         unsigned int pmsg_read_cnt;
108         struct pstore_info pstore;
109 };
110 
111 static struct platform_device *dummy;
112 static struct ramoops_platform_data *dummy_data;
113 
114 static int ramoops_pstore_open(struct pstore_info *psi)
115 {
116         struct ramoops_context *cxt = psi->data;
117 
118         cxt->dump_read_cnt = 0;
119         cxt->console_read_cnt = 0;
120         cxt->ftrace_read_cnt = 0;
121         cxt->pmsg_read_cnt = 0;
122         return 0;
123 }
124 
125 static struct persistent_ram_zone *
126 ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
127                      u64 *id,
128                      enum pstore_type_id *typep, enum pstore_type_id type,
129                      bool update)
130 {
131         struct persistent_ram_zone *prz;
132         int i = (*c)++;
133 
134         if (i >= max)
135                 return NULL;
136 
137         prz = przs[i];
138         if (!prz)
139                 return NULL;
140 
141         /* Update old/shadowed buffer. */
142         if (update)
143                 persistent_ram_save_old(prz);
144 
145         if (!persistent_ram_old_size(prz))
146                 return NULL;
147 
148         *typep = type;
149         *id = i;
150 
151         return prz;
152 }
153 
154 static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
155                                   bool *compressed)
156 {
157         char data_type;
158         int header_length = 0;
159 
160         if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
161                         &time->tv_nsec, &data_type, &header_length) == 3) {
162                 if (data_type == 'C')
163                         *compressed = true;
164                 else
165                         *compressed = false;
166         } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
167                         &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
168                         *compressed = false;
169         } else {
170                 time->tv_sec = 0;
171                 time->tv_nsec = 0;
172                 *compressed = false;
173         }
174         return header_length;
175 }
176 
177 static bool prz_ok(struct persistent_ram_zone *prz)
178 {
179         return !!prz && !!(persistent_ram_old_size(prz) +
180                            persistent_ram_ecc_string(prz, NULL, 0));
181 }
182 
183 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
184                                    int *count, struct timespec *time,
185                                    char **buf, bool *compressed,
186                                    ssize_t *ecc_notice_size,
187                                    struct pstore_info *psi)
188 {
189         ssize_t size;
190         struct ramoops_context *cxt = psi->data;
191         struct persistent_ram_zone *prz = NULL;
192         int header_length = 0;
193 
194         /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
195          * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
196          * valid time stamps, so it is initialized to zero.
197          */
198         time->tv_sec = 0;
199         time->tv_nsec = 0;
200         *compressed = false;
201 
202         /* Find the next valid persistent_ram_zone for DMESG */
203         while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
204                 prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
205                                            cxt->max_dump_cnt, id, type,
206                                            PSTORE_TYPE_DMESG, 1);
207                 if (!prz_ok(prz))
208                         continue;
209                 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
210                                                       time, compressed);
211                 /* Clear and skip this DMESG record if it has no valid header */
212                 if (!header_length) {
213                         persistent_ram_free_old(prz);
214                         persistent_ram_zap(prz);
215                         prz = NULL;
216                 }
217         }
218 
219         if (!prz_ok(prz))
220                 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
221                                            1, id, type, PSTORE_TYPE_CONSOLE, 0);
222         if (!prz_ok(prz))
223                 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
224                                            1, id, type, PSTORE_TYPE_FTRACE, 0);
225         if (!prz_ok(prz))
226                 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
227                                            1, id, type, PSTORE_TYPE_PMSG, 0);
228         if (!prz_ok(prz))
229                 return 0;
230 
231         size = persistent_ram_old_size(prz) - header_length;
232 
233         /* ECC correction notice */
234         *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
235 
236         *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
237         if (*buf == NULL)
238                 return -ENOMEM;
239 
240         memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
241         persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
242 
243         return size;
244 }
245 
246 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
247                                      bool compressed)
248 {
249         char *hdr;
250         struct timespec timestamp;
251         size_t len;
252 
253         /* Report zeroed timestamp if called before timekeeping has resumed. */
254         if (__getnstimeofday(&timestamp)) {
255                 timestamp.tv_sec = 0;
256                 timestamp.tv_nsec = 0;
257         }
258         hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
259                 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
260                 compressed ? 'C' : 'D');
261         WARN_ON_ONCE(!hdr);
262         len = hdr ? strlen(hdr) : 0;
263         persistent_ram_write(prz, hdr, len);
264         kfree(hdr);
265 
266         return len;
267 }
268 
269 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
270                                             enum kmsg_dump_reason reason,
271                                             u64 *id, unsigned int part,
272                                             const char *buf,
273                                             bool compressed, size_t size,
274                                             struct pstore_info *psi)
275 {
276         struct ramoops_context *cxt = psi->data;
277         struct persistent_ram_zone *prz;
278         size_t hlen;
279 
280         if (type == PSTORE_TYPE_CONSOLE) {
281                 if (!cxt->cprz)
282                         return -ENOMEM;
283                 persistent_ram_write(cxt->cprz, buf, size);
284                 return 0;
285         } else if (type == PSTORE_TYPE_FTRACE) {
286                 if (!cxt->fprz)
287                         return -ENOMEM;
288                 persistent_ram_write(cxt->fprz, buf, size);
289                 return 0;
290         } else if (type == PSTORE_TYPE_PMSG) {
291                 if (!cxt->mprz)
292                         return -ENOMEM;
293                 persistent_ram_write(cxt->mprz, buf, size);
294                 return 0;
295         }
296 
297         if (type != PSTORE_TYPE_DMESG)
298                 return -EINVAL;
299 
300         /* Out of the various dmesg dump types, ramoops is currently designed
301          * to only store crash logs, rather than storing general kernel logs.
302          */
303         if (reason != KMSG_DUMP_OOPS &&
304             reason != KMSG_DUMP_PANIC)
305                 return -EINVAL;
306 
307         /* Skip Oopes when configured to do so. */
308         if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
309                 return -EINVAL;
310 
311         /* Explicitly only take the first part of any new crash.
312          * If our buffer is larger than kmsg_bytes, this can never happen,
313          * and if our buffer is smaller than kmsg_bytes, we don't want the
314          * report split across multiple records.
315          */
316         if (part != 1)
317                 return -ENOSPC;
318 
319         if (!cxt->przs)
320                 return -ENOSPC;
321 
322         prz = cxt->przs[cxt->dump_write_cnt];
323 
324         hlen = ramoops_write_kmsg_hdr(prz, compressed);
325         if (size + hlen > prz->buffer_size)
326                 size = prz->buffer_size - hlen;
327         persistent_ram_write(prz, buf, size);
328 
329         cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
330 
331         return 0;
332 }
333 
334 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
335                                 struct timespec time, struct pstore_info *psi)
336 {
337         struct ramoops_context *cxt = psi->data;
338         struct persistent_ram_zone *prz;
339 
340         switch (type) {
341         case PSTORE_TYPE_DMESG:
342                 if (id >= cxt->max_dump_cnt)
343                         return -EINVAL;
344                 prz = cxt->przs[id];
345                 break;
346         case PSTORE_TYPE_CONSOLE:
347                 prz = cxt->cprz;
348                 break;
349         case PSTORE_TYPE_FTRACE:
350                 prz = cxt->fprz;
351                 break;
352         case PSTORE_TYPE_PMSG:
353                 prz = cxt->mprz;
354                 break;
355         default:
356                 return -EINVAL;
357         }
358 
359         persistent_ram_free_old(prz);
360         persistent_ram_zap(prz);
361 
362         return 0;
363 }
364 
365 static struct ramoops_context oops_cxt = {
366         .pstore = {
367                 .owner  = THIS_MODULE,
368                 .name   = "ramoops",
369                 .open   = ramoops_pstore_open,
370                 .read   = ramoops_pstore_read,
371                 .write_buf      = ramoops_pstore_write_buf,
372                 .erase  = ramoops_pstore_erase,
373         },
374 };
375 
376 static void ramoops_free_przs(struct ramoops_context *cxt)
377 {
378         int i;
379 
380         cxt->max_dump_cnt = 0;
381         if (!cxt->przs)
382                 return;
383 
384         for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++)
385                 persistent_ram_free(cxt->przs[i]);
386         kfree(cxt->przs);
387 }
388 
389 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
390                              phys_addr_t *paddr, size_t dump_mem_sz)
391 {
392         int err = -ENOMEM;
393         int i;
394 
395         if (!cxt->record_size)
396                 return 0;
397 
398         if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
399                 dev_err(dev, "no room for dumps\n");
400                 return -ENOMEM;
401         }
402 
403         cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
404         if (!cxt->max_dump_cnt)
405                 return -ENOMEM;
406 
407         cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
408                              GFP_KERNEL);
409         if (!cxt->przs) {
410                 dev_err(dev, "failed to initialize a prz array for dumps\n");
411                 goto fail_prz;
412         }
413 
414         for (i = 0; i < cxt->max_dump_cnt; i++) {
415                 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
416                                                   &cxt->ecc_info,
417                                                   cxt->memtype);
418                 if (IS_ERR(cxt->przs[i])) {
419                         err = PTR_ERR(cxt->przs[i]);
420                         dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
421                                 cxt->record_size, (unsigned long long)*paddr, err);
422                         goto fail_prz;
423                 }
424                 *paddr += cxt->record_size;
425         }
426 
427         return 0;
428 fail_prz:
429         ramoops_free_przs(cxt);
430         return err;
431 }
432 
433 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
434                             struct persistent_ram_zone **prz,
435                             phys_addr_t *paddr, size_t sz, u32 sig)
436 {
437         if (!sz)
438                 return 0;
439 
440         if (*paddr + sz - cxt->phys_addr > cxt->size) {
441                 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
442                         sz, (unsigned long long)*paddr,
443                         cxt->size, (unsigned long long)cxt->phys_addr);
444                 return -ENOMEM;
445         }
446 
447         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype);
448         if (IS_ERR(*prz)) {
449                 int err = PTR_ERR(*prz);
450 
451                 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
452                         sz, (unsigned long long)*paddr, err);
453                 return err;
454         }
455 
456         persistent_ram_zap(*prz);
457 
458         *paddr += sz;
459 
460         return 0;
461 }
462 
463 static int ramoops_parse_dt_size(struct platform_device *pdev,
464                                  const char *propname, u32 *value)
465 {
466         u32 val32 = 0;
467         int ret;
468 
469         ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
470         if (ret < 0 && ret != -EINVAL) {
471                 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
472                         propname, ret);
473                 return ret;
474         }
475 
476         if (val32 > INT_MAX) {
477                 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
478                 return -EOVERFLOW;
479         }
480 
481         *value = val32;
482         return 0;
483 }
484 
485 static int ramoops_parse_dt(struct platform_device *pdev,
486                             struct ramoops_platform_data *pdata)
487 {
488         struct device_node *of_node = pdev->dev.of_node;
489         struct resource *res;
490         u32 value;
491         int ret;
492 
493         dev_dbg(&pdev->dev, "using Device Tree\n");
494 
495         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
496         if (!res) {
497                 dev_err(&pdev->dev,
498                         "failed to locate DT /reserved-memory resource\n");
499                 return -EINVAL;
500         }
501 
502         pdata->mem_size = resource_size(res);
503         pdata->mem_address = res->start;
504         pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
505         pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
506 
507 #define parse_size(name, field) {                                       \
508                 ret = ramoops_parse_dt_size(pdev, name, &value);        \
509                 if (ret < 0)                                            \
510                         return ret;                                     \
511                 field = value;                                          \
512         }
513 
514         parse_size("record-size", pdata->record_size);
515         parse_size("console-size", pdata->console_size);
516         parse_size("ftrace-size", pdata->ftrace_size);
517         parse_size("pmsg-size", pdata->pmsg_size);
518         parse_size("ecc-size", pdata->ecc_info.ecc_size);
519 
520 #undef parse_size
521 
522         return 0;
523 }
524 
525 static int ramoops_probe(struct platform_device *pdev)
526 {
527         struct device *dev = &pdev->dev;
528         struct ramoops_platform_data *pdata = dev->platform_data;
529         struct ramoops_context *cxt = &oops_cxt;
530         size_t dump_mem_sz;
531         phys_addr_t paddr;
532         int err = -EINVAL;
533 
534         if (dev_of_node(dev) && !pdata) {
535                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
536                 if (!pdata) {
537                         err = -ENOMEM;
538                         goto fail_out;
539                 }
540 
541                 err = ramoops_parse_dt(pdev, pdata);
542                 if (err < 0)
543                         goto fail_out;
544         }
545 
546         /* Only a single ramoops area allowed at a time, so fail extra
547          * probes.
548          */
549         if (cxt->max_dump_cnt)
550                 goto fail_out;
551 
552         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
553                         !pdata->ftrace_size && !pdata->pmsg_size)) {
554                 pr_err("The memory size and the record/console size must be "
555                         "non-zero\n");
556                 goto fail_out;
557         }
558 
559         if (pdata->record_size && !is_power_of_2(pdata->record_size))
560                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
561         if (pdata->console_size && !is_power_of_2(pdata->console_size))
562                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
563         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
564                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
565         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
566                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
567 
568         cxt->size = pdata->mem_size;
569         cxt->phys_addr = pdata->mem_address;
570         cxt->memtype = pdata->mem_type;
571         cxt->record_size = pdata->record_size;
572         cxt->console_size = pdata->console_size;
573         cxt->ftrace_size = pdata->ftrace_size;
574         cxt->pmsg_size = pdata->pmsg_size;
575         cxt->dump_oops = pdata->dump_oops;
576         cxt->ecc_info = pdata->ecc_info;
577 
578         paddr = cxt->phys_addr;
579 
580         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
581                         - cxt->pmsg_size;
582         err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
583         if (err)
584                 goto fail_out;
585 
586         err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
587                                cxt->console_size, 0);
588         if (err)
589                 goto fail_init_cprz;
590 
591         err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
592                                LINUX_VERSION_CODE);
593         if (err)
594                 goto fail_init_fprz;
595 
596         err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
597         if (err)
598                 goto fail_init_mprz;
599 
600         cxt->pstore.data = cxt;
601         /*
602          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
603          * have to handle dumps, we must have at least record_size buffer. And
604          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
605          * ZERO_SIZE_PTR).
606          */
607         if (cxt->console_size)
608                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
609         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
610         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
611         spin_lock_init(&cxt->pstore.buf_lock);
612         if (!cxt->pstore.buf) {
613                 pr_err("cannot allocate pstore buffer\n");
614                 err = -ENOMEM;
615                 goto fail_clear;
616         }
617 
618         err = pstore_register(&cxt->pstore);
619         if (err) {
620                 pr_err("registering with pstore failed\n");
621                 goto fail_buf;
622         }
623 
624         /*
625          * Update the module parameter variables as well so they are visible
626          * through /sys/module/ramoops/parameters/
627          */
628         mem_size = pdata->mem_size;
629         mem_address = pdata->mem_address;
630         record_size = pdata->record_size;
631         dump_oops = pdata->dump_oops;
632         ramoops_console_size = pdata->console_size;
633         ramoops_pmsg_size = pdata->pmsg_size;
634         ramoops_ftrace_size = pdata->ftrace_size;
635 
636         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
637                 cxt->size, (unsigned long long)cxt->phys_addr,
638                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
639 
640         return 0;
641 
642 fail_buf:
643         kfree(cxt->pstore.buf);
644 fail_clear:
645         cxt->pstore.bufsize = 0;
646         persistent_ram_free(cxt->mprz);
647 fail_init_mprz:
648         persistent_ram_free(cxt->fprz);
649 fail_init_fprz:
650         persistent_ram_free(cxt->cprz);
651 fail_init_cprz:
652         ramoops_free_przs(cxt);
653 fail_out:
654         return err;
655 }
656 
657 static int ramoops_remove(struct platform_device *pdev)
658 {
659         struct ramoops_context *cxt = &oops_cxt;
660 
661         pstore_unregister(&cxt->pstore);
662         cxt->max_dump_cnt = 0;
663 
664         kfree(cxt->pstore.buf);
665         cxt->pstore.bufsize = 0;
666 
667         persistent_ram_free(cxt->mprz);
668         persistent_ram_free(cxt->fprz);
669         persistent_ram_free(cxt->cprz);
670         ramoops_free_przs(cxt);
671 
672         return 0;
673 }
674 
675 static const struct of_device_id dt_match[] = {
676         { .compatible = "ramoops" },
677         {}
678 };
679 
680 static struct platform_driver ramoops_driver = {
681         .probe          = ramoops_probe,
682         .remove         = ramoops_remove,
683         .driver         = {
684                 .name           = "ramoops",
685                 .of_match_table = dt_match,
686         },
687 };
688 
689 static void ramoops_register_dummy(void)
690 {
691         if (!mem_size)
692                 return;
693 
694         pr_info("using module parameters\n");
695 
696         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
697         if (!dummy_data) {
698                 pr_info("could not allocate pdata\n");
699                 return;
700         }
701 
702         dummy_data->mem_size = mem_size;
703         dummy_data->mem_address = mem_address;
704         dummy_data->mem_type = mem_type;
705         dummy_data->record_size = record_size;
706         dummy_data->console_size = ramoops_console_size;
707         dummy_data->ftrace_size = ramoops_ftrace_size;
708         dummy_data->pmsg_size = ramoops_pmsg_size;
709         dummy_data->dump_oops = dump_oops;
710         /*
711          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
712          * (using 1 byte for ECC isn't much of use anyway).
713          */
714         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
715 
716         dummy = platform_device_register_data(NULL, "ramoops", -1,
717                         dummy_data, sizeof(struct ramoops_platform_data));
718         if (IS_ERR(dummy)) {
719                 pr_info("could not create platform device: %ld\n",
720                         PTR_ERR(dummy));
721         }
722 }
723 
724 static int __init ramoops_init(void)
725 {
726         ramoops_register_dummy();
727         return platform_driver_register(&ramoops_driver);
728 }
729 postcore_initcall(ramoops_init);
730 
731 static void __exit ramoops_exit(void)
732 {
733         platform_driver_unregister(&ramoops_driver);
734         platform_device_unregister(dummy);
735         kfree(dummy_data);
736 }
737 module_exit(ramoops_exit);
738 
739 MODULE_LICENSE("GPL");
740 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
741 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
742 

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