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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * RAM Oops/Panic logger
- *
- * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
- * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/kernel.h>
- #include <linux/err.h>
- #include <linux/module.h>
- #include <linux/version.h>
- #include <linux/pstore.h>
- #include <linux/io.h>
- #include <linux/ioport.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include <linux/compiler.h>
- #include <linux/pstore_ram.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/of_reserved_mem.h>
- #include "internal.h"
- #define RAMOOPS_KERNMSG_HDR "===="
- #define MIN_MEM_SIZE 4096UL
- static ulong record_size = MIN_MEM_SIZE;
- module_param(record_size, ulong, 0400);
- MODULE_PARM_DESC(record_size,
- "size of each dump done on oops/panic");
- static ulong ramoops_console_size = MIN_MEM_SIZE;
- module_param_named(console_size, ramoops_console_size, ulong, 0400);
- MODULE_PARM_DESC(console_size, "size of kernel console log");
- static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
- module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
- MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
- static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
- module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
- MODULE_PARM_DESC(pmsg_size, "size of user space message log");
- static unsigned long long mem_address;
- module_param_hw(mem_address, ullong, other, 0400);
- MODULE_PARM_DESC(mem_address,
- "start of reserved RAM used to store oops/panic logs");
- static ulong mem_size;
- module_param(mem_size, ulong, 0400);
- MODULE_PARM_DESC(mem_size,
- "size of reserved RAM used to store oops/panic logs");
- static unsigned int mem_type;
- module_param(mem_type, uint, 0400);
- MODULE_PARM_DESC(mem_type,
- "memory type: 0=write-combined (default), 1=unbuffered, 2=cached");
- static int ramoops_max_reason = -1;
- module_param_named(max_reason, ramoops_max_reason, int, 0400);
- MODULE_PARM_DESC(max_reason,
- "maximum reason for kmsg dump (default 2: Oops and Panic) ");
- static int ramoops_ecc;
- module_param_named(ecc, ramoops_ecc, int, 0400);
- MODULE_PARM_DESC(ramoops_ecc,
- "if non-zero, the option enables ECC support and specifies "
- "ECC buffer size in bytes (1 is a special value, means 16 "
- "bytes ECC)");
- static int ramoops_dump_oops = -1;
- module_param_named(dump_oops, ramoops_dump_oops, int, 0400);
- MODULE_PARM_DESC(dump_oops,
- "(deprecated: use max_reason instead) set to 1 to dump oopses & panics, 0 to only dump panics");
- struct ramoops_context {
- struct persistent_ram_zone **dprzs; /* Oops dump zones */
- struct persistent_ram_zone *cprz; /* Console zone */
- struct persistent_ram_zone **fprzs; /* Ftrace zones */
- struct persistent_ram_zone *mprz; /* PMSG zone */
- phys_addr_t phys_addr;
- unsigned long size;
- unsigned int memtype;
- size_t record_size;
- size_t console_size;
- size_t ftrace_size;
- size_t pmsg_size;
- u32 flags;
- struct persistent_ram_ecc_info ecc_info;
- unsigned int max_dump_cnt;
- unsigned int dump_write_cnt;
- /* _read_cnt need clear on ramoops_pstore_open */
- unsigned int dump_read_cnt;
- unsigned int console_read_cnt;
- unsigned int max_ftrace_cnt;
- unsigned int ftrace_read_cnt;
- unsigned int pmsg_read_cnt;
- struct pstore_info pstore;
- };
- static struct platform_device *dummy;
- static int ramoops_pstore_open(struct pstore_info *psi)
- {
- struct ramoops_context *cxt = psi->data;
- cxt->dump_read_cnt = 0;
- cxt->console_read_cnt = 0;
- cxt->ftrace_read_cnt = 0;
- cxt->pmsg_read_cnt = 0;
- return 0;
- }
- static struct persistent_ram_zone *
- ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id,
- struct pstore_record *record)
- {
- struct persistent_ram_zone *prz;
- /* Give up if we never existed or have hit the end. */
- if (!przs)
- return NULL;
- prz = przs[id];
- if (!prz)
- return NULL;
- /* Update old/shadowed buffer. */
- if (prz->type == PSTORE_TYPE_DMESG)
- persistent_ram_save_old(prz);
- if (!persistent_ram_old_size(prz))
- return NULL;
- record->type = prz->type;
- record->id = id;
- return prz;
- }
- static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time,
- bool *compressed)
- {
- char data_type;
- int header_length = 0;
- if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n",
- (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type,
- &header_length) == 3) {
- time->tv_nsec *= 1000;
- if (data_type == 'C')
- *compressed = true;
- else
- *compressed = false;
- } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n",
- (time64_t *)&time->tv_sec, &time->tv_nsec,
- &header_length) == 2) {
- time->tv_nsec *= 1000;
- *compressed = false;
- } else {
- time->tv_sec = 0;
- time->tv_nsec = 0;
- *compressed = false;
- }
- return header_length;
- }
- static bool prz_ok(struct persistent_ram_zone *prz)
- {
- return !!prz && !!(persistent_ram_old_size(prz) +
- persistent_ram_ecc_string(prz, NULL, 0));
- }
- static ssize_t ramoops_pstore_read(struct pstore_record *record)
- {
- ssize_t size = 0;
- struct ramoops_context *cxt = record->psi->data;
- struct persistent_ram_zone *prz = NULL;
- int header_length = 0;
- bool free_prz = false;
- /*
- * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
- * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
- * valid time stamps, so it is initialized to zero.
- */
- record->time.tv_sec = 0;
- record->time.tv_nsec = 0;
- record->compressed = false;
- /* Find the next valid persistent_ram_zone for DMESG */
- while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
- prz = ramoops_get_next_prz(cxt->dprzs, cxt->dump_read_cnt++,
- record);
- if (!prz_ok(prz))
- continue;
- header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
- &record->time,
- &record->compressed);
- /* Clear and skip this DMESG record if it has no valid header */
- if (!header_length) {
- persistent_ram_free_old(prz);
- persistent_ram_zap(prz);
- prz = NULL;
- }
- }
- if (!prz_ok(prz) && !cxt->console_read_cnt++)
- prz = ramoops_get_next_prz(&cxt->cprz, 0 /* single */, record);
- if (!prz_ok(prz) && !cxt->pmsg_read_cnt++)
- prz = ramoops_get_next_prz(&cxt->mprz, 0 /* single */, record);
- /* ftrace is last since it may want to dynamically allocate memory. */
- if (!prz_ok(prz)) {
- if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) &&
- !cxt->ftrace_read_cnt++) {
- prz = ramoops_get_next_prz(cxt->fprzs, 0 /* single */,
- record);
- } else {
- /*
- * Build a new dummy record which combines all the
- * per-cpu records including metadata and ecc info.
- */
- struct persistent_ram_zone *tmp_prz, *prz_next;
- tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
- GFP_KERNEL);
- if (!tmp_prz)
- return -ENOMEM;
- prz = tmp_prz;
- free_prz = true;
- while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
- prz_next = ramoops_get_next_prz(cxt->fprzs,
- cxt->ftrace_read_cnt++, record);
- if (!prz_ok(prz_next))
- continue;
- tmp_prz->ecc_info = prz_next->ecc_info;
- tmp_prz->corrected_bytes +=
- prz_next->corrected_bytes;
- tmp_prz->bad_blocks += prz_next->bad_blocks;
- size = pstore_ftrace_combine_log(
- &tmp_prz->old_log,
- &tmp_prz->old_log_size,
- prz_next->old_log,
- prz_next->old_log_size);
- if (size)
- goto out;
- }
- record->id = 0;
- }
- }
- if (!prz_ok(prz)) {
- size = 0;
- goto out;
- }
- size = persistent_ram_old_size(prz) - header_length;
- /* ECC correction notice */
- record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
- record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
- if (record->buf == NULL) {
- size = -ENOMEM;
- goto out;
- }
- memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
- size);
- persistent_ram_ecc_string(prz, record->buf + size,
- record->ecc_notice_size + 1);
- out:
- if (free_prz) {
- kfree(prz->old_log);
- kfree(prz);
- }
- return size;
- }
- static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
- struct pstore_record *record)
- {
- char hdr[36]; /* "===="(4), %lld(20), "."(1), %06lu(6), "-%c\n"(3) */
- size_t len;
- len = scnprintf(hdr, sizeof(hdr),
- RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",
- (time64_t)record->time.tv_sec,
- record->time.tv_nsec / 1000,
- record->compressed ? 'C' : 'D');
- persistent_ram_write(prz, hdr, len);
- return len;
- }
- static int notrace ramoops_pstore_write(struct pstore_record *record)
- {
- struct ramoops_context *cxt = record->psi->data;
- struct persistent_ram_zone *prz;
- size_t size, hlen;
- if (record->type == PSTORE_TYPE_CONSOLE) {
- if (!cxt->cprz)
- return -ENOMEM;
- persistent_ram_write(cxt->cprz, record->buf, record->size);
- return 0;
- } else if (record->type == PSTORE_TYPE_FTRACE) {
- int zonenum;
- if (!cxt->fprzs)
- return -ENOMEM;
- /*
- * Choose zone by if we're using per-cpu buffers.
- */
- if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
- zonenum = smp_processor_id();
- else
- zonenum = 0;
- persistent_ram_write(cxt->fprzs[zonenum], record->buf,
- record->size);
- return 0;
- } else if (record->type == PSTORE_TYPE_PMSG) {
- pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
- return -EINVAL;
- }
- if (record->type != PSTORE_TYPE_DMESG)
- return -EINVAL;
- /*
- * We could filter on record->reason here if we wanted to (which
- * would duplicate what happened before the "max_reason" setting
- * was added), but that would defeat the purpose of a system
- * changing printk.always_kmsg_dump, so instead log everything that
- * the kmsg dumper sends us, since it should be doing the filtering
- * based on the combination of printk.always_kmsg_dump and our
- * requested "max_reason".
- */
- /*
- * Explicitly only take the first part of any new crash.
- * If our buffer is larger than kmsg_bytes, this can never happen,
- * and if our buffer is smaller than kmsg_bytes, we don't want the
- * report split across multiple records.
- */
- if (record->part != 1)
- return -ENOSPC;
- if (!cxt->dprzs)
- return -ENOSPC;
- prz = cxt->dprzs[cxt->dump_write_cnt];
- /*
- * Since this is a new crash dump, we need to reset the buffer in
- * case it still has an old dump present. Without this, the new dump
- * will get appended, which would seriously confuse anything trying
- * to check dump file contents. Specifically, ramoops_read_kmsg_hdr()
- * expects to find a dump header in the beginning of buffer data, so
- * we must to reset the buffer values, in order to ensure that the
- * header will be written to the beginning of the buffer.
- */
- persistent_ram_zap(prz);
- /* Build header and append record contents. */
- hlen = ramoops_write_kmsg_hdr(prz, record);
- if (!hlen)
- return -ENOMEM;
- size = record->size;
- if (size + hlen > prz->buffer_size)
- size = prz->buffer_size - hlen;
- persistent_ram_write(prz, record->buf, size);
- cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
- return 0;
- }
- static int notrace ramoops_pstore_write_user(struct pstore_record *record,
- const char __user *buf)
- {
- if (record->type == PSTORE_TYPE_PMSG) {
- struct ramoops_context *cxt = record->psi->data;
- if (!cxt->mprz)
- return -ENOMEM;
- return persistent_ram_write_user(cxt->mprz, buf, record->size);
- }
- return -EINVAL;
- }
- static int ramoops_pstore_erase(struct pstore_record *record)
- {
- struct ramoops_context *cxt = record->psi->data;
- struct persistent_ram_zone *prz;
- switch (record->type) {
- case PSTORE_TYPE_DMESG:
- if (record->id >= cxt->max_dump_cnt)
- return -EINVAL;
- prz = cxt->dprzs[record->id];
- break;
- case PSTORE_TYPE_CONSOLE:
- prz = cxt->cprz;
- break;
- case PSTORE_TYPE_FTRACE:
- if (record->id >= cxt->max_ftrace_cnt)
- return -EINVAL;
- prz = cxt->fprzs[record->id];
- break;
- case PSTORE_TYPE_PMSG:
- prz = cxt->mprz;
- break;
- default:
- return -EINVAL;
- }
- persistent_ram_free_old(prz);
- persistent_ram_zap(prz);
- return 0;
- }
- static struct ramoops_context oops_cxt = {
- .pstore = {
- .owner = THIS_MODULE,
- .name = "ramoops",
- .open = ramoops_pstore_open,
- .read = ramoops_pstore_read,
- .write = ramoops_pstore_write,
- .write_user = ramoops_pstore_write_user,
- .erase = ramoops_pstore_erase,
- },
- };
- static void ramoops_free_przs(struct ramoops_context *cxt)
- {
- int i;
- /* Free dump PRZs */
- if (cxt->dprzs) {
- for (i = 0; i < cxt->max_dump_cnt; i++)
- persistent_ram_free(cxt->dprzs[i]);
- kfree(cxt->dprzs);
- cxt->max_dump_cnt = 0;
- }
- /* Free ftrace PRZs */
- if (cxt->fprzs) {
- for (i = 0; i < cxt->max_ftrace_cnt; i++)
- persistent_ram_free(cxt->fprzs[i]);
- kfree(cxt->fprzs);
- cxt->max_ftrace_cnt = 0;
- }
- }
- static int ramoops_init_przs(const char *name,
- struct device *dev, struct ramoops_context *cxt,
- struct persistent_ram_zone ***przs,
- phys_addr_t *paddr, size_t mem_sz,
- ssize_t record_size,
- unsigned int *cnt, u32 sig, u32 flags)
- {
- int err = -ENOMEM;
- int i;
- size_t zone_sz;
- struct persistent_ram_zone **prz_ar;
- /* Allocate nothing for 0 mem_sz or 0 record_size. */
- if (mem_sz == 0 || record_size == 0) {
- *cnt = 0;
- return 0;
- }
- /*
- * If we have a negative record size, calculate it based on
- * mem_sz / *cnt. If we have a positive record size, calculate
- * cnt from mem_sz / record_size.
- */
- if (record_size < 0) {
- if (*cnt == 0)
- return 0;
- record_size = mem_sz / *cnt;
- if (record_size == 0) {
- dev_err(dev, "%s record size == 0 (%zu / %u)\n",
- name, mem_sz, *cnt);
- goto fail;
- }
- } else {
- *cnt = mem_sz / record_size;
- if (*cnt == 0) {
- dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
- name, mem_sz, record_size);
- goto fail;
- }
- }
- if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
- dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
- name,
- mem_sz, (unsigned long long)*paddr,
- cxt->size, (unsigned long long)cxt->phys_addr);
- goto fail;
- }
- zone_sz = mem_sz / *cnt;
- if (!zone_sz) {
- dev_err(dev, "%s zone size == 0\n", name);
- goto fail;
- }
- prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
- if (!prz_ar)
- goto fail;
- for (i = 0; i < *cnt; i++) {
- char *label;
- if (*cnt == 1)
- label = kasprintf(GFP_KERNEL, "ramoops:%s", name);
- else
- label = kasprintf(GFP_KERNEL, "ramoops:%s(%d/%d)",
- name, i, *cnt - 1);
- prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
- &cxt->ecc_info,
- cxt->memtype, flags, label);
- kfree(label);
- if (IS_ERR(prz_ar[i])) {
- err = PTR_ERR(prz_ar[i]);
- dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
- name, record_size,
- (unsigned long long)*paddr, err);
- while (i > 0) {
- i--;
- persistent_ram_free(prz_ar[i]);
- }
- kfree(prz_ar);
- goto fail;
- }
- *paddr += zone_sz;
- prz_ar[i]->type = pstore_name_to_type(name);
- }
- *przs = prz_ar;
- return 0;
- fail:
- *cnt = 0;
- return err;
- }
- static int ramoops_init_prz(const char *name,
- struct device *dev, struct ramoops_context *cxt,
- struct persistent_ram_zone **prz,
- phys_addr_t *paddr, size_t sz, u32 sig)
- {
- char *label;
- if (!sz)
- return 0;
- if (*paddr + sz - cxt->phys_addr > cxt->size) {
- dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
- name, sz, (unsigned long long)*paddr,
- cxt->size, (unsigned long long)cxt->phys_addr);
- return -ENOMEM;
- }
- label = kasprintf(GFP_KERNEL, "ramoops:%s", name);
- *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
- cxt->memtype, PRZ_FLAG_ZAP_OLD, label);
- kfree(label);
- if (IS_ERR(*prz)) {
- int err = PTR_ERR(*prz);
- dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
- name, sz, (unsigned long long)*paddr, err);
- return err;
- }
- *paddr += sz;
- (*prz)->type = pstore_name_to_type(name);
- return 0;
- }
- /* Read a u32 from a dt property and make sure it's safe for an int. */
- static int ramoops_parse_dt_u32(struct platform_device *pdev,
- const char *propname,
- u32 default_value, u32 *value)
- {
- u32 val32 = 0;
- int ret;
- ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
- if (ret == -EINVAL) {
- /* field is missing, use default value. */
- val32 = default_value;
- } else if (ret < 0) {
- dev_err(&pdev->dev, "failed to parse property %s: %d\n",
- propname, ret);
- return ret;
- }
- /* Sanity check our results. */
- if (val32 > INT_MAX) {
- dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
- return -EOVERFLOW;
- }
- *value = val32;
- return 0;
- }
- static int ramoops_parse_dt(struct platform_device *pdev,
- struct ramoops_platform_data *pdata)
- {
- struct device_node *of_node = pdev->dev.of_node;
- struct device_node *parent_node;
- struct reserved_mem *rmem;
- struct resource *res;
- u32 value;
- int ret;
- dev_dbg(&pdev->dev, "using Device Tree\n");
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- rmem = of_reserved_mem_lookup(of_node);
- if (rmem) {
- pdata->mem_size = rmem->size;
- pdata->mem_address = rmem->base;
- } else {
- dev_err(&pdev->dev,
- "failed to locate DT /reserved-memory resource\n");
- return -EINVAL;
- }
- } else {
- pdata->mem_size = resource_size(res);
- pdata->mem_address = res->start;
- }
- /*
- * Setting "unbuffered" is deprecated and will be ignored if
- * "mem_type" is also specified.
- */
- pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
- /*
- * Setting "no-dump-oops" is deprecated and will be ignored if
- * "max_reason" is also specified.
- */
- if (of_property_read_bool(of_node, "no-dump-oops"))
- pdata->max_reason = KMSG_DUMP_PANIC;
- else
- pdata->max_reason = KMSG_DUMP_OOPS;
- #define parse_u32(name, field, default_value) { \
- ret = ramoops_parse_dt_u32(pdev, name, default_value, \
- &value); \
- if (ret < 0) \
- return ret; \
- field = value; \
- }
- parse_u32("mem-type", pdata->record_size, pdata->mem_type);
- parse_u32("record-size", pdata->record_size, 0);
- parse_u32("console-size", pdata->console_size, 0);
- parse_u32("ftrace-size", pdata->ftrace_size, 0);
- parse_u32("pmsg-size", pdata->pmsg_size, 0);
- parse_u32("ecc-size", pdata->ecc_info.ecc_size, 0);
- parse_u32("flags", pdata->flags, 0);
- parse_u32("max-reason", pdata->max_reason, pdata->max_reason);
- #undef parse_u32
- /*
- * Some old Chromebooks relied on the kernel setting the
- * console_size and pmsg_size to the record size since that's
- * what the downstream kernel did. These same Chromebooks had
- * "ramoops" straight under the root node which isn't
- * according to the current upstream bindings (though it was
- * arguably acceptable under a prior version of the bindings).
- * Let's make those old Chromebooks work by detecting that
- * we're not a child of "reserved-memory" and mimicking the
- * expected behavior.
- */
- parent_node = of_get_parent(of_node);
- if (!of_node_name_eq(parent_node, "reserved-memory") &&
- !pdata->console_size && !pdata->ftrace_size &&
- !pdata->pmsg_size && !pdata->ecc_info.ecc_size) {
- pdata->console_size = pdata->record_size;
- pdata->pmsg_size = pdata->record_size;
- }
- of_node_put(parent_node);
- return 0;
- }
- static int ramoops_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct ramoops_platform_data *pdata = dev->platform_data;
- struct ramoops_platform_data pdata_local;
- struct ramoops_context *cxt = &oops_cxt;
- size_t dump_mem_sz;
- phys_addr_t paddr;
- int err = -EINVAL;
- /*
- * Only a single ramoops area allowed at a time, so fail extra
- * probes.
- */
- if (cxt->max_dump_cnt) {
- pr_err("already initialized\n");
- goto fail_out;
- }
- if (dev_of_node(dev) && !pdata) {
- pdata = &pdata_local;
- memset(pdata, 0, sizeof(*pdata));
- err = ramoops_parse_dt(pdev, pdata);
- if (err < 0)
- goto fail_out;
- }
- /* Make sure we didn't get bogus platform data pointer. */
- if (!pdata) {
- pr_err("NULL platform data\n");
- goto fail_out;
- }
- if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
- !pdata->ftrace_size && !pdata->pmsg_size)) {
- pr_err("The memory size and the record/console size must be "
- "non-zero\n");
- goto fail_out;
- }
- if (pdata->record_size && !is_power_of_2(pdata->record_size))
- pdata->record_size = rounddown_pow_of_two(pdata->record_size);
- if (pdata->console_size && !is_power_of_2(pdata->console_size))
- pdata->console_size = rounddown_pow_of_two(pdata->console_size);
- if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
- pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
- if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
- pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
- cxt->size = pdata->mem_size;
- cxt->phys_addr = pdata->mem_address;
- cxt->memtype = pdata->mem_type;
- cxt->record_size = pdata->record_size;
- cxt->console_size = pdata->console_size;
- cxt->ftrace_size = pdata->ftrace_size;
- cxt->pmsg_size = pdata->pmsg_size;
- cxt->flags = pdata->flags;
- cxt->ecc_info = pdata->ecc_info;
- paddr = cxt->phys_addr;
- dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
- - cxt->pmsg_size;
- err = ramoops_init_przs("dmesg", dev, cxt, &cxt->dprzs, &paddr,
- dump_mem_sz, cxt->record_size,
- &cxt->max_dump_cnt, 0, 0);
- if (err)
- goto fail_out;
- err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
- cxt->console_size, 0);
- if (err)
- goto fail_init_cprz;
- cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
- ? nr_cpu_ids
- : 1;
- err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
- cxt->ftrace_size, -1,
- &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
- (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
- ? PRZ_FLAG_NO_LOCK : 0);
- if (err)
- goto fail_init_fprz;
- err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
- cxt->pmsg_size, 0);
- if (err)
- goto fail_init_mprz;
- cxt->pstore.data = cxt;
- /*
- * Prepare frontend flags based on which areas are initialized.
- * For ramoops_init_przs() cases, the "max count" variable tells
- * if there are regions present. For ramoops_init_prz() cases,
- * the single region size is how to check.
- */
- cxt->pstore.flags = 0;
- if (cxt->max_dump_cnt) {
- cxt->pstore.flags |= PSTORE_FLAGS_DMESG;
- cxt->pstore.max_reason = pdata->max_reason;
- }
- if (cxt->console_size)
- cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
- if (cxt->max_ftrace_cnt)
- cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
- if (cxt->pmsg_size)
- cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
- /*
- * Since bufsize is only used for dmesg crash dumps, it
- * must match the size of the dprz record (after PRZ header
- * and ECC bytes have been accounted for).
- */
- if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) {
- cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
- cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
- if (!cxt->pstore.buf) {
- pr_err("cannot allocate pstore crash dump buffer\n");
- err = -ENOMEM;
- goto fail_clear;
- }
- }
- err = pstore_register(&cxt->pstore);
- if (err) {
- pr_err("registering with pstore failed\n");
- goto fail_buf;
- }
- /*
- * Update the module parameter variables as well so they are visible
- * through /sys/module/ramoops/parameters/
- */
- mem_size = pdata->mem_size;
- mem_address = pdata->mem_address;
- record_size = pdata->record_size;
- ramoops_max_reason = pdata->max_reason;
- ramoops_console_size = pdata->console_size;
- ramoops_pmsg_size = pdata->pmsg_size;
- ramoops_ftrace_size = pdata->ftrace_size;
- pr_info("using 0x%lx@0x%llx, ecc: %d\n",
- cxt->size, (unsigned long long)cxt->phys_addr,
- cxt->ecc_info.ecc_size);
- return 0;
- fail_buf:
- kfree(cxt->pstore.buf);
- fail_clear:
- cxt->pstore.bufsize = 0;
- persistent_ram_free(cxt->mprz);
- fail_init_mprz:
- fail_init_fprz:
- persistent_ram_free(cxt->cprz);
- fail_init_cprz:
- ramoops_free_przs(cxt);
- fail_out:
- return err;
- }
- static int ramoops_remove(struct platform_device *pdev)
- {
- struct ramoops_context *cxt = &oops_cxt;
- pstore_unregister(&cxt->pstore);
- kfree(cxt->pstore.buf);
- cxt->pstore.bufsize = 0;
- persistent_ram_free(cxt->mprz);
- persistent_ram_free(cxt->cprz);
- ramoops_free_przs(cxt);
- return 0;
- }
- static const struct of_device_id dt_match[] = {
- { .compatible = "ramoops" },
- {}
- };
- static struct platform_driver ramoops_driver = {
- .probe = ramoops_probe,
- .remove = ramoops_remove,
- .driver = {
- .name = "ramoops",
- .of_match_table = dt_match,
- },
- };
- static inline void ramoops_unregister_dummy(void)
- {
- platform_device_unregister(dummy);
- dummy = NULL;
- }
- static void __init ramoops_register_dummy(void)
- {
- struct ramoops_platform_data pdata;
- /*
- * Prepare a dummy platform data structure to carry the module
- * parameters. If mem_size isn't set, then there are no module
- * parameters, and we can skip this.
- */
- if (!mem_size)
- return;
- pr_info("using module parameters\n");
- memset(&pdata, 0, sizeof(pdata));
- pdata.mem_size = mem_size;
- pdata.mem_address = mem_address;
- pdata.mem_type = mem_type;
- pdata.record_size = record_size;
- pdata.console_size = ramoops_console_size;
- pdata.ftrace_size = ramoops_ftrace_size;
- pdata.pmsg_size = ramoops_pmsg_size;
- /* If "max_reason" is set, its value has priority over "dump_oops". */
- if (ramoops_max_reason >= 0)
- pdata.max_reason = ramoops_max_reason;
- /* Otherwise, if "dump_oops" is set, parse it into "max_reason". */
- else if (ramoops_dump_oops != -1)
- pdata.max_reason = ramoops_dump_oops ? KMSG_DUMP_OOPS
- : KMSG_DUMP_PANIC;
- /* And if neither are explicitly set, use the default. */
- else
- pdata.max_reason = KMSG_DUMP_OOPS;
- pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
- /*
- * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
- * (using 1 byte for ECC isn't much of use anyway).
- */
- pdata.ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
- dummy = platform_device_register_data(NULL, "ramoops", -1,
- &pdata, sizeof(pdata));
- if (IS_ERR(dummy)) {
- pr_info("could not create platform device: %ld\n",
- PTR_ERR(dummy));
- dummy = NULL;
- }
- }
- static int __init ramoops_init(void)
- {
- int ret;
- ramoops_register_dummy();
- ret = platform_driver_register(&ramoops_driver);
- if (ret != 0)
- ramoops_unregister_dummy();
- return ret;
- }
- postcore_initcall(ramoops_init);
- static void __exit ramoops_exit(void)
- {
- platform_driver_unregister(&ramoops_driver);
- ramoops_unregister_dummy();
- }
- module_exit(ramoops_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
- MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
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