510 lines
13 KiB
C
510 lines
13 KiB
C
/*
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* RAM Oops/Panic logger
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*
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* Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
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* Copyright (C) 2011 Kees Cook <keescook@chromium.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/pstore.h>
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#include <linux/time.h>
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#include <linux/ioport.h>
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#include <linux/compiler.h>
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#include <linux/pstore_ram.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/log2.h>
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#include <linux/spinlock.h>
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#include <malloc.h>
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#include <printk.h>
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#include <stdio.h>
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#include <globalvar.h>
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#include <init.h>
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#include <common.h>
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#define RAMOOPS_KERNMSG_HDR "===="
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#define MIN_MEM_SIZE 4096UL
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static const ulong record_size = CONFIG_FS_PSTORE_RAMOOPS_RECORD_SIZE;
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static const ulong ramoops_console_size = CONFIG_FS_PSTORE_RAMOOPS_CONSOLE_SIZE;
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static const ulong ramoops_ftrace_size = CONFIG_FS_PSTORE_RAMOOPS_FTRACE_SIZE;
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static const ulong ramoops_pmsg_size = CONFIG_FS_PSTORE_RAMOOPS_PMSG_SIZE;
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static const ulong mem_size = CONFIG_FS_PSTORE_RAMOOPS_SIZE;
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static const int dump_oops = 1;
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static const int ramoops_ecc = CONFIG_FS_PSTORE_ECC_SIZE;
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struct ramoops_context {
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struct persistent_ram_zone **przs;
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struct persistent_ram_zone *cprz;
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struct persistent_ram_zone *fprz;
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struct persistent_ram_zone *mprz;
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phys_addr_t phys_addr;
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unsigned long size;
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unsigned int memtype;
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size_t record_size;
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size_t console_size;
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size_t ftrace_size;
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size_t pmsg_size;
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int dump_oops;
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struct persistent_ram_ecc_info ecc_info;
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unsigned int max_dump_cnt;
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unsigned int dump_write_cnt;
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/* _read_cnt need clear on ramoops_pstore_open */
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unsigned int dump_read_cnt;
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unsigned int console_read_cnt;
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unsigned int ftrace_read_cnt;
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unsigned int pmsg_read_cnt;
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struct pstore_info pstore;
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};
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static struct ramoops_platform_data *dummy_data;
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static int ramoops_pstore_open(struct pstore_info *psi)
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{
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struct ramoops_context *cxt = psi->data;
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cxt->dump_read_cnt = 0;
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cxt->console_read_cnt = 0;
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cxt->ftrace_read_cnt = 0;
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cxt->pmsg_read_cnt = 0;
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return 0;
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}
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static struct persistent_ram_zone *
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ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
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u64 *id,
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enum pstore_type_id *typep, enum pstore_type_id type,
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bool update)
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{
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struct persistent_ram_zone *prz;
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int i = (*c)++;
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if (i >= max)
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return NULL;
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prz = przs[i];
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if (!prz)
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return NULL;
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/* Update old/shadowed buffer. */
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if (update)
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persistent_ram_save_old(prz);
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if (!persistent_ram_old_size(prz))
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return NULL;
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*typep = type;
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*id = i;
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return prz;
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}
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static bool prz_ok(struct persistent_ram_zone *prz)
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{
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return !!prz && !!(persistent_ram_old_size(prz) +
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persistent_ram_ecc_string(prz, NULL, 0));
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}
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static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
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int *count, char **buf, bool *compressed,
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struct pstore_info *psi)
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{
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ssize_t size;
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ssize_t ecc_notice_size;
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struct ramoops_context *cxt = psi->data;
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struct persistent_ram_zone *prz;
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prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
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cxt->max_dump_cnt, id, type,
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PSTORE_TYPE_DMESG, 0);
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if (!prz_ok(prz))
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prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
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1, id, type, PSTORE_TYPE_CONSOLE, 0);
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if (!prz_ok(prz))
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prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
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1, id, type, PSTORE_TYPE_FTRACE, 0);
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if (!prz_ok(prz))
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prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
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1, id, type, PSTORE_TYPE_PMSG, 0);
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if (!prz_ok(prz))
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return 0;
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if (!persistent_ram_old(prz))
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return 0;
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size = persistent_ram_old_size(prz);
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/* ECC correction notice */
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ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
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*buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
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if (*buf == NULL)
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return -ENOMEM;
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memcpy(*buf, (char *)persistent_ram_old(prz), size);
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persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
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return size + ecc_notice_size;
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}
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static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
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enum kmsg_dump_reason reason,
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u64 *id, unsigned int part,
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const char *buf,
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bool compressed, size_t size,
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struct pstore_info *psi)
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{
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struct ramoops_context *cxt = psi->data;
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struct persistent_ram_zone *prz;
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if (type == PSTORE_TYPE_CONSOLE) {
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if (!cxt->cprz)
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return -ENOMEM;
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persistent_ram_write(cxt->cprz, buf, size);
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return 0;
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} else if (type == PSTORE_TYPE_FTRACE) {
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if (!cxt->fprz)
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return -ENOMEM;
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persistent_ram_write(cxt->fprz, buf, size);
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return 0;
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} else if (type == PSTORE_TYPE_PMSG) {
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if (!cxt->mprz)
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return -ENOMEM;
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persistent_ram_write(cxt->mprz, buf, size);
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return 0;
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}
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if (type != PSTORE_TYPE_DMESG)
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return -EINVAL;
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/* Explicitly only take the first part of any new crash.
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* If our buffer is larger than kmsg_bytes, this can never happen,
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* and if our buffer is smaller than kmsg_bytes, we don't want the
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* report split across multiple records.
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*/
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if (part != 1)
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return -ENOSPC;
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if (!cxt->przs)
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return -ENOSPC;
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prz = cxt->przs[cxt->dump_write_cnt];
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persistent_ram_write(prz, buf, size);
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cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
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return 0;
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}
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static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
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struct pstore_info *psi)
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{
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struct ramoops_context *cxt = psi->data;
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struct persistent_ram_zone *prz;
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switch (type) {
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case PSTORE_TYPE_DMESG:
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if (id >= cxt->max_dump_cnt)
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return -EINVAL;
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prz = cxt->przs[id];
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break;
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case PSTORE_TYPE_CONSOLE:
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prz = cxt->cprz;
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break;
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case PSTORE_TYPE_FTRACE:
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prz = cxt->fprz;
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break;
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case PSTORE_TYPE_PMSG:
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prz = cxt->mprz;
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break;
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default:
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return -EINVAL;
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}
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persistent_ram_free_old(prz);
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persistent_ram_zap(prz);
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return 0;
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}
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static struct ramoops_context oops_cxt = {
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.pstore = {
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.name = "ramoops",
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.open = ramoops_pstore_open,
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.read = ramoops_pstore_read,
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.write_buf = ramoops_pstore_write_buf,
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.erase = ramoops_pstore_erase,
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},
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};
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static void ramoops_free_przs(struct ramoops_context *cxt)
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{
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int i;
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cxt->max_dump_cnt = 0;
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if (!cxt->przs)
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return;
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for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++)
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persistent_ram_free(cxt->przs[i]);
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kfree(cxt->przs);
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}
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static int ramoops_init_przs(struct ramoops_context *cxt, phys_addr_t *paddr,
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size_t dump_mem_sz)
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{
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int err = -ENOMEM;
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int i;
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if (!cxt->record_size)
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return 0;
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if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
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pr_err("no room for dumps\n");
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return -ENOMEM;
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}
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cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
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if (!cxt->max_dump_cnt)
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return -ENOMEM;
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cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
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GFP_KERNEL);
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if (!cxt->przs) {
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pr_err("failed to initialize a prz array for dumps\n");
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goto fail_prz;
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}
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for (i = 0; i < cxt->max_dump_cnt; i++) {
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size_t sz = cxt->record_size;
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cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
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&cxt->ecc_info,
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cxt->memtype);
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if (IS_ERR(cxt->przs[i])) {
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err = PTR_ERR(cxt->przs[i]);
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pr_err("failed to request mem region (0x%zx@0x%llx): %d\n",
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sz, (unsigned long long)*paddr, err);
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goto fail_prz;
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}
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*paddr += sz;
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}
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return 0;
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fail_prz:
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ramoops_free_przs(cxt);
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return err;
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}
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static int ramoops_init_prz(struct ramoops_context *cxt,
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struct persistent_ram_zone **prz,
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phys_addr_t *paddr, size_t sz, u32 sig)
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{
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if (!sz)
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return 0;
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if (*paddr + sz - cxt->phys_addr > cxt->size) {
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pr_err("no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
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sz, (unsigned long long)*paddr,
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cxt->size, (unsigned long long)cxt->phys_addr);
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return -ENOMEM;
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}
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*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
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cxt->memtype);
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if (IS_ERR(*prz)) {
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int err = PTR_ERR(*prz);
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pr_err("failed to request mem region (0x%zx@0x%llx): %d\n",
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sz, (unsigned long long)*paddr, err);
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return err;
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}
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persistent_ram_zap(*prz);
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*paddr += sz;
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return 0;
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}
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static int ramoops_probe(struct ramoops_platform_data *pdata)
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{
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struct ramoops_context *cxt = &oops_cxt;
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size_t dump_mem_sz;
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phys_addr_t paddr;
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int err = -EINVAL;
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char kernelargs[512];
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/* Only a single ramoops area allowed at a time, so fail extra
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* probes.
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*/
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if (cxt->max_dump_cnt)
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goto fail_out;
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if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
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!pdata->ftrace_size && !pdata->pmsg_size)) {
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pr_err("The memory size and the record/console size must be "
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"non-zero\n");
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goto fail_out;
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}
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if (pdata->record_size && !is_power_of_2(pdata->record_size))
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pdata->record_size = rounddown_pow_of_two(pdata->record_size);
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if (pdata->console_size && !is_power_of_2(pdata->console_size))
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pdata->console_size = rounddown_pow_of_two(pdata->console_size);
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if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
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pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
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if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
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pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
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cxt->size = pdata->mem_size;
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cxt->phys_addr = pdata->mem_address;
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cxt->memtype = pdata->mem_type;
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cxt->record_size = pdata->record_size;
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cxt->console_size = pdata->console_size;
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cxt->ftrace_size = pdata->ftrace_size;
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cxt->pmsg_size = pdata->pmsg_size;
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cxt->dump_oops = pdata->dump_oops;
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cxt->ecc_info = pdata->ecc_info;
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paddr = cxt->phys_addr;
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dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
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- cxt->pmsg_size;
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err = ramoops_init_przs(cxt, &paddr, dump_mem_sz);
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if (err)
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goto fail_out;
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err = ramoops_init_prz(cxt, &cxt->cprz, &paddr,
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cxt->console_size, 0);
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if (err)
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goto fail_init_cprz;
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err = ramoops_init_prz(cxt, &cxt->fprz, &paddr, cxt->ftrace_size, 0);
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if (err)
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goto fail_init_fprz;
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err = ramoops_init_prz(cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
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if (err)
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goto fail_init_mprz;
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cxt->pstore.data = cxt;
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/*
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* Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
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* have to handle dumps, we must have at least record_size buffer. And
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* for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
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* ZERO_SIZE_PTR).
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*/
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if (cxt->console_size)
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cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
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cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
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cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
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spin_lock_init(&cxt->pstore.buf_lock);
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if (!cxt->pstore.buf) {
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pr_err("cannot allocate pstore buffer\n");
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err = -ENOMEM;
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goto fail_clear;
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}
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err = pstore_register(&cxt->pstore);
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if (err) {
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pr_err("registering with pstore failed\n");
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goto fail_buf;
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}
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pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
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cxt->size, (unsigned long long)cxt->phys_addr,
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cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
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scnprintf(kernelargs, sizeof(kernelargs),
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"ramoops.record_size=0x%x "
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"ramoops.console_size=0x%x "
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"ramoops.ftrace_size=0x%x "
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"ramoops.pmsg_size=0x%x "
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"ramoops.mem_address=0x%llx "
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"ramoops.mem_size=0x%lx "
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"ramoops.ecc=%d",
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cxt->record_size,
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cxt->console_size,
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cxt->ftrace_size,
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cxt->pmsg_size,
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(unsigned long long)cxt->phys_addr,
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mem_size,
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ramoops_ecc);
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globalvar_add_simple("linux.bootargs.ramoops", kernelargs);
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if (IS_ENABLED(CONFIG_OFTREE))
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of_add_reserve_entry(cxt->phys_addr, cxt->phys_addr + mem_size);
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return 0;
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fail_buf:
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kfree(cxt->pstore.buf);
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fail_clear:
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cxt->pstore.bufsize = 0;
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kfree(cxt->mprz);
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fail_init_mprz:
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kfree(cxt->fprz);
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fail_init_fprz:
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kfree(cxt->cprz);
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fail_init_cprz:
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ramoops_free_przs(cxt);
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fail_out:
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return err;
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}
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unsigned long arm_mem_ramoops_get(void);
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static void ramoops_register_dummy(void)
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{
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dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
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if (!dummy_data) {
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pr_info("could not allocate pdata\n");
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return;
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}
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dummy_data->mem_size = mem_size;
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dummy_data->mem_address = arm_mem_ramoops_get();
|
|
dummy_data->mem_type = 0;
|
|
dummy_data->record_size = record_size;
|
|
dummy_data->console_size = ramoops_console_size;
|
|
dummy_data->ftrace_size = ramoops_ftrace_size;
|
|
dummy_data->pmsg_size = ramoops_pmsg_size;
|
|
dummy_data->dump_oops = dump_oops;
|
|
/*
|
|
* For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
|
|
* (using 1 byte for ECC isn't much of use anyway).
|
|
*/
|
|
dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
|
|
|
|
ramoops_probe(dummy_data);
|
|
}
|
|
|
|
static int __init ramoops_init(void)
|
|
{
|
|
ramoops_register_dummy();
|
|
return 0;
|
|
}
|
|
postcore_initcall(ramoops_init);
|