From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- fs/pstore/ram.c | 982 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 982 insertions(+) create mode 100644 fs/pstore/ram.c (limited to 'fs/pstore/ram.c') diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c new file mode 100644 index 000000000..d36702c7a --- /dev/null +++ b/fs/pstore/ram.c @@ -0,0 +1,982 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * RAM Oops/Panic logger + * + * Copyright (C) 2010 Marco Stornelli + * Copyright (C) 2011 Kees Cook + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" +#include "ram_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 = kvzalloc(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) { + kvfree(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 pmsg PRZ */ + persistent_ram_free(&cxt->mprz); + + /* Free console PRZ */ + persistent_ram_free(&cxt->cprz); + + /* 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->dprzs = NULL; + 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->fprzs = NULL; + 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); + prz_ar = NULL; + 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 resource *res; + u32 value; + int ret; + + dev_dbg(&pdev->dev, "using Device Tree\n"); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, + "failed to locate DT /reserved-memory resource\n"); + return -EINVAL; + } + + 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->mem_type, 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"); + err = -EINVAL; + 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"); + err = -EINVAL; + 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_init; + + err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, + cxt->console_size, 0); + if (err) + goto fail_init; + + err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, + cxt->pmsg_size, 0); + if (err) + goto fail_init; + + 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; + + 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 = kvzalloc(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: + kvfree(cxt->pstore.buf); +fail_clear: + cxt->pstore.bufsize = 0; +fail_init: + ramoops_free_przs(cxt); +fail_out: + return err; +} + +static void ramoops_remove(struct platform_device *pdev) +{ + struct ramoops_context *cxt = &oops_cxt; + + pstore_unregister(&cxt->pstore); + + kvfree(cxt->pstore.buf); + cxt->pstore.bufsize = 0; + + ramoops_free_przs(cxt); +} + +static const struct of_device_id dt_match[] = { + { .compatible = "ramoops" }, + {} +}; + +static struct platform_driver ramoops_driver = { + .probe = ramoops_probe, + .remove_new = 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 "); +MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); -- cgit v1.2.3