Version:  2.0.40 2.2.26 2.4.37 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 4.9

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 notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
335                                                  enum kmsg_dump_reason reason,
336                                                  u64 *id, unsigned int part,
337                                                  const char __user *buf,
338                                                  bool compressed, size_t size,
339                                                  struct pstore_info *psi)
340 {
341         if (type == PSTORE_TYPE_PMSG) {
342                 struct ramoops_context *cxt = psi->data;
343 
344                 if (!cxt->mprz)
345                         return -ENOMEM;
346                 return persistent_ram_write_user(cxt->mprz, buf, size);
347         }
348 
349         return -EINVAL;
350 }
351 
352 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
353                                 struct timespec time, struct pstore_info *psi)
354 {
355         struct ramoops_context *cxt = psi->data;
356         struct persistent_ram_zone *prz;
357 
358         switch (type) {
359         case PSTORE_TYPE_DMESG:
360                 if (id >= cxt->max_dump_cnt)
361                         return -EINVAL;
362                 prz = cxt->przs[id];
363                 break;
364         case PSTORE_TYPE_CONSOLE:
365                 prz = cxt->cprz;
366                 break;
367         case PSTORE_TYPE_FTRACE:
368                 prz = cxt->fprz;
369                 break;
370         case PSTORE_TYPE_PMSG:
371                 prz = cxt->mprz;
372                 break;
373         default:
374                 return -EINVAL;
375         }
376 
377         persistent_ram_free_old(prz);
378         persistent_ram_zap(prz);
379 
380         return 0;
381 }
382 
383 static struct ramoops_context oops_cxt = {
384         .pstore = {
385                 .owner  = THIS_MODULE,
386                 .name   = "ramoops",
387                 .open   = ramoops_pstore_open,
388                 .read   = ramoops_pstore_read,
389                 .write_buf      = ramoops_pstore_write_buf,
390                 .write_buf_user = ramoops_pstore_write_buf_user,
391                 .erase  = ramoops_pstore_erase,
392         },
393 };
394 
395 static void ramoops_free_przs(struct ramoops_context *cxt)
396 {
397         int i;
398 
399         if (!cxt->przs)
400                 return;
401 
402         for (i = 0; i < cxt->max_dump_cnt; i++)
403                 persistent_ram_free(cxt->przs[i]);
404 
405         kfree(cxt->przs);
406         cxt->max_dump_cnt = 0;
407 }
408 
409 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
410                              phys_addr_t *paddr, size_t dump_mem_sz)
411 {
412         int err = -ENOMEM;
413         int i;
414 
415         if (!cxt->record_size)
416                 return 0;
417 
418         if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
419                 dev_err(dev, "no room for dumps\n");
420                 return -ENOMEM;
421         }
422 
423         cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
424         if (!cxt->max_dump_cnt)
425                 return -ENOMEM;
426 
427         cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
428                              GFP_KERNEL);
429         if (!cxt->przs) {
430                 dev_err(dev, "failed to initialize a prz array for dumps\n");
431                 goto fail_mem;
432         }
433 
434         for (i = 0; i < cxt->max_dump_cnt; i++) {
435                 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
436                                                   &cxt->ecc_info,
437                                                   cxt->memtype);
438                 if (IS_ERR(cxt->przs[i])) {
439                         err = PTR_ERR(cxt->przs[i]);
440                         dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
441                                 cxt->record_size, (unsigned long long)*paddr, err);
442 
443                         while (i > 0) {
444                                 i--;
445                                 persistent_ram_free(cxt->przs[i]);
446                         }
447                         goto fail_prz;
448                 }
449                 *paddr += cxt->record_size;
450         }
451 
452         return 0;
453 fail_prz:
454         kfree(cxt->przs);
455 fail_mem:
456         cxt->max_dump_cnt = 0;
457         return err;
458 }
459 
460 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
461                             struct persistent_ram_zone **prz,
462                             phys_addr_t *paddr, size_t sz, u32 sig)
463 {
464         if (!sz)
465                 return 0;
466 
467         if (*paddr + sz - cxt->phys_addr > cxt->size) {
468                 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
469                         sz, (unsigned long long)*paddr,
470                         cxt->size, (unsigned long long)cxt->phys_addr);
471                 return -ENOMEM;
472         }
473 
474         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype);
475         if (IS_ERR(*prz)) {
476                 int err = PTR_ERR(*prz);
477 
478                 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
479                         sz, (unsigned long long)*paddr, err);
480                 return err;
481         }
482 
483         persistent_ram_zap(*prz);
484 
485         *paddr += sz;
486 
487         return 0;
488 }
489 
490 static int ramoops_parse_dt_size(struct platform_device *pdev,
491                                  const char *propname, u32 *value)
492 {
493         u32 val32 = 0;
494         int ret;
495 
496         ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
497         if (ret < 0 && ret != -EINVAL) {
498                 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
499                         propname, ret);
500                 return ret;
501         }
502 
503         if (val32 > INT_MAX) {
504                 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
505                 return -EOVERFLOW;
506         }
507 
508         *value = val32;
509         return 0;
510 }
511 
512 static int ramoops_parse_dt(struct platform_device *pdev,
513                             struct ramoops_platform_data *pdata)
514 {
515         struct device_node *of_node = pdev->dev.of_node;
516         struct resource *res;
517         u32 value;
518         int ret;
519 
520         dev_dbg(&pdev->dev, "using Device Tree\n");
521 
522         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
523         if (!res) {
524                 dev_err(&pdev->dev,
525                         "failed to locate DT /reserved-memory resource\n");
526                 return -EINVAL;
527         }
528 
529         pdata->mem_size = resource_size(res);
530         pdata->mem_address = res->start;
531         pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
532         pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
533 
534 #define parse_size(name, field) {                                       \
535                 ret = ramoops_parse_dt_size(pdev, name, &value);        \
536                 if (ret < 0)                                            \
537                         return ret;                                     \
538                 field = value;                                          \
539         }
540 
541         parse_size("record-size", pdata->record_size);
542         parse_size("console-size", pdata->console_size);
543         parse_size("ftrace-size", pdata->ftrace_size);
544         parse_size("pmsg-size", pdata->pmsg_size);
545         parse_size("ecc-size", pdata->ecc_info.ecc_size);
546 
547 #undef parse_size
548 
549         return 0;
550 }
551 
552 static int ramoops_probe(struct platform_device *pdev)
553 {
554         struct device *dev = &pdev->dev;
555         struct ramoops_platform_data *pdata = dev->platform_data;
556         struct ramoops_context *cxt = &oops_cxt;
557         size_t dump_mem_sz;
558         phys_addr_t paddr;
559         int err = -EINVAL;
560 
561         if (dev_of_node(dev) && !pdata) {
562                 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
563                 if (!pdata) {
564                         err = -ENOMEM;
565                         goto fail_out;
566                 }
567 
568                 err = ramoops_parse_dt(pdev, pdata);
569                 if (err < 0)
570                         goto fail_out;
571         }
572 
573         /* Only a single ramoops area allowed at a time, so fail extra
574          * probes.
575          */
576         if (cxt->max_dump_cnt)
577                 goto fail_out;
578 
579         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
580                         !pdata->ftrace_size && !pdata->pmsg_size)) {
581                 pr_err("The memory size and the record/console size must be "
582                         "non-zero\n");
583                 goto fail_out;
584         }
585 
586         if (pdata->record_size && !is_power_of_2(pdata->record_size))
587                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
588         if (pdata->console_size && !is_power_of_2(pdata->console_size))
589                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
590         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
591                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
592         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
593                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
594 
595         cxt->size = pdata->mem_size;
596         cxt->phys_addr = pdata->mem_address;
597         cxt->memtype = pdata->mem_type;
598         cxt->record_size = pdata->record_size;
599         cxt->console_size = pdata->console_size;
600         cxt->ftrace_size = pdata->ftrace_size;
601         cxt->pmsg_size = pdata->pmsg_size;
602         cxt->dump_oops = pdata->dump_oops;
603         cxt->ecc_info = pdata->ecc_info;
604 
605         paddr = cxt->phys_addr;
606 
607         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
608                         - cxt->pmsg_size;
609         err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
610         if (err)
611                 goto fail_out;
612 
613         err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
614                                cxt->console_size, 0);
615         if (err)
616                 goto fail_init_cprz;
617 
618         err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
619                                LINUX_VERSION_CODE);
620         if (err)
621                 goto fail_init_fprz;
622 
623         err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
624         if (err)
625                 goto fail_init_mprz;
626 
627         cxt->pstore.data = cxt;
628         /*
629          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
630          * have to handle dumps, we must have at least record_size buffer. And
631          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
632          * ZERO_SIZE_PTR).
633          */
634         if (cxt->console_size)
635                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
636         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
637         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
638         if (!cxt->pstore.buf) {
639                 pr_err("cannot allocate pstore buffer\n");
640                 err = -ENOMEM;
641                 goto fail_clear;
642         }
643         spin_lock_init(&cxt->pstore.buf_lock);
644 
645         cxt->pstore.flags = PSTORE_FLAGS_DMESG;
646         if (cxt->console_size)
647                 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
648         if (cxt->ftrace_size)
649                 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
650         if (cxt->pmsg_size)
651                 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
652 
653         err = pstore_register(&cxt->pstore);
654         if (err) {
655                 pr_err("registering with pstore failed\n");
656                 goto fail_buf;
657         }
658 
659         /*
660          * Update the module parameter variables as well so they are visible
661          * through /sys/module/ramoops/parameters/
662          */
663         mem_size = pdata->mem_size;
664         mem_address = pdata->mem_address;
665         record_size = pdata->record_size;
666         dump_oops = pdata->dump_oops;
667         ramoops_console_size = pdata->console_size;
668         ramoops_pmsg_size = pdata->pmsg_size;
669         ramoops_ftrace_size = pdata->ftrace_size;
670 
671         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
672                 cxt->size, (unsigned long long)cxt->phys_addr,
673                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
674 
675         return 0;
676 
677 fail_buf:
678         kfree(cxt->pstore.buf);
679 fail_clear:
680         cxt->pstore.bufsize = 0;
681         persistent_ram_free(cxt->mprz);
682 fail_init_mprz:
683         persistent_ram_free(cxt->fprz);
684 fail_init_fprz:
685         persistent_ram_free(cxt->cprz);
686 fail_init_cprz:
687         ramoops_free_przs(cxt);
688 fail_out:
689         return err;
690 }
691 
692 static int ramoops_remove(struct platform_device *pdev)
693 {
694         struct ramoops_context *cxt = &oops_cxt;
695 
696         pstore_unregister(&cxt->pstore);
697 
698         kfree(cxt->pstore.buf);
699         cxt->pstore.bufsize = 0;
700 
701         persistent_ram_free(cxt->mprz);
702         persistent_ram_free(cxt->fprz);
703         persistent_ram_free(cxt->cprz);
704         ramoops_free_przs(cxt);
705 
706         return 0;
707 }
708 
709 static const struct of_device_id dt_match[] = {
710         { .compatible = "ramoops" },
711         {}
712 };
713 
714 static struct platform_driver ramoops_driver = {
715         .probe          = ramoops_probe,
716         .remove         = ramoops_remove,
717         .driver         = {
718                 .name           = "ramoops",
719                 .of_match_table = dt_match,
720         },
721 };
722 
723 static void ramoops_register_dummy(void)
724 {
725         if (!mem_size)
726                 return;
727 
728         pr_info("using module parameters\n");
729 
730         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
731         if (!dummy_data) {
732                 pr_info("could not allocate pdata\n");
733                 return;
734         }
735 
736         dummy_data->mem_size = mem_size;
737         dummy_data->mem_address = mem_address;
738         dummy_data->mem_type = mem_type;
739         dummy_data->record_size = record_size;
740         dummy_data->console_size = ramoops_console_size;
741         dummy_data->ftrace_size = ramoops_ftrace_size;
742         dummy_data->pmsg_size = ramoops_pmsg_size;
743         dummy_data->dump_oops = dump_oops;
744         /*
745          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
746          * (using 1 byte for ECC isn't much of use anyway).
747          */
748         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
749 
750         dummy = platform_device_register_data(NULL, "ramoops", -1,
751                         dummy_data, sizeof(struct ramoops_platform_data));
752         if (IS_ERR(dummy)) {
753                 pr_info("could not create platform device: %ld\n",
754                         PTR_ERR(dummy));
755         }
756 }
757 
758 static int __init ramoops_init(void)
759 {
760         ramoops_register_dummy();
761         return platform_driver_register(&ramoops_driver);
762 }
763 postcore_initcall(ramoops_init);
764 
765 static void __exit ramoops_exit(void)
766 {
767         platform_driver_unregister(&ramoops_driver);
768         platform_device_unregister(dummy);
769         kfree(dummy_data);
770 }
771 module_exit(ramoops_exit);
772 
773 MODULE_LICENSE("GPL");
774 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
775 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
776 

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