mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
569 lines
14 KiB
C
569 lines
14 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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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/module.h>
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#include <linux/version.h>
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#include <linux/pstore.h>
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#include <linux/time.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/compiler.h>
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#include <linux/pstore_ram.h>
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#define RAMOOPS_KERNMSG_HDR "===="
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#define MIN_MEM_SIZE 4096UL
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static ulong record_size = MIN_MEM_SIZE;
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module_param(record_size, ulong, 0400);
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MODULE_PARM_DESC(record_size,
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"size of each dump done on oops/panic");
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static ulong ramoops_console_size = MIN_MEM_SIZE;
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module_param_named(console_size, ramoops_console_size, ulong, 0400);
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MODULE_PARM_DESC(console_size, "size of kernel console log");
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static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
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module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
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MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
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static ulong mem_address;
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module_param(mem_address, ulong, 0400);
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MODULE_PARM_DESC(mem_address,
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"start of reserved RAM used to store oops/panic logs");
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static ulong mem_size;
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module_param(mem_size, ulong, 0400);
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MODULE_PARM_DESC(mem_size,
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"size of reserved RAM used to store oops/panic logs");
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static int dump_oops = 1;
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module_param(dump_oops, int, 0600);
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MODULE_PARM_DESC(dump_oops,
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"set to 1 to dump oopses, 0 to only dump panics (default 1)");
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static int ramoops_ecc;
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module_param_named(ecc, ramoops_ecc, int, 0600);
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MODULE_PARM_DESC(ramoops_ecc,
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"if non-zero, the option enables ECC support and specifies "
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"ECC buffer size in bytes (1 is a special value, means 16 "
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"bytes ECC)");
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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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phys_addr_t phys_addr;
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unsigned long size;
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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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int dump_oops;
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int ecc_size;
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unsigned int max_dump_cnt;
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unsigned int dump_write_cnt;
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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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struct pstore_info pstore;
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};
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static struct platform_device *dummy;
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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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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 (update) {
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/* Update old/shadowed buffer. */
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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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}
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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 ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
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int *count, struct timespec *time,
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char **buf, struct pstore_info *psi)
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{
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ssize_t 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, 1);
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if (!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)
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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)
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return 0;
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/* TODO(kees): Bogus time for the moment. */
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time->tv_sec = 0;
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time->tv_nsec = 0;
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size = persistent_ram_old_size(prz);
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*buf = kmalloc(size, GFP_KERNEL);
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if (*buf == NULL)
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return -ENOMEM;
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memcpy(*buf, persistent_ram_old(prz), size);
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return size;
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}
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static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
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{
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char *hdr;
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struct timespec timestamp;
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size_t len;
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/* Report zeroed timestamp if called before timekeeping has resumed. */
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if (__getnstimeofday(×tamp)) {
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timestamp.tv_sec = 0;
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timestamp.tv_nsec = 0;
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}
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hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
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(long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000));
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WARN_ON_ONCE(!hdr);
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len = hdr ? strlen(hdr) : 0;
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persistent_ram_write(prz, hdr, len);
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kfree(hdr);
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return len;
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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, 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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size_t hlen;
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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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}
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if (type != PSTORE_TYPE_DMESG)
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return -EINVAL;
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/* Out of the various dmesg dump types, ramoops is currently designed
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* to only store crash logs, rather than storing general kernel logs.
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*/
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if (reason != KMSG_DUMP_OOPS &&
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reason != KMSG_DUMP_PANIC)
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return -EINVAL;
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/* Skip Oopes when configured to do so. */
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if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
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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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hlen = ramoops_write_kmsg_hdr(prz);
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if (size + hlen > prz->buffer_size)
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size = prz->buffer_size - hlen;
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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 timespec time, 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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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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.owner = THIS_MODULE,
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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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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 device *dev, struct ramoops_context *cxt,
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phys_addr_t *paddr, 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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dev_err(dev, "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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dev_err(dev, "failed to initialize a prz array for dumps\n");
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return -ENOMEM;
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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, cxt->ecc_size);
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if (IS_ERR(cxt->przs[i])) {
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err = PTR_ERR(cxt->przs[i]);
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dev_err(dev, "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 device *dev, 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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dev_err(dev, "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_size);
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if (IS_ERR(*prz)) {
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int err = PTR_ERR(*prz);
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dev_err(dev, "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 platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ramoops_platform_data *pdata = pdev->dev.platform_data;
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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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/* 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)) {
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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 (!is_power_of_2(pdata->mem_size))
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pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
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if (!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 (!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 (!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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cxt->dump_read_cnt = 0;
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cxt->size = pdata->mem_size;
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cxt->phys_addr = pdata->mem_address;
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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->dump_oops = pdata->dump_oops;
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cxt->ecc_size = pdata->ecc_size;
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paddr = cxt->phys_addr;
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|
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dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size;
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err = ramoops_init_przs(dev, 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(dev, 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(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
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LINUX_VERSION_CODE);
|
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if (err)
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goto fail_init_fprz;
|
|
|
|
if (!cxt->przs && !cxt->cprz && !cxt->fprz) {
|
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pr_err("memory size too small, minimum is %zu\n",
|
|
cxt->console_size + cxt->record_size +
|
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cxt->ftrace_size);
|
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goto fail_cnt;
|
|
}
|
|
|
|
cxt->pstore.data = cxt;
|
|
/*
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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).
|
|
*/
|
|
if (cxt->console_size)
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cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
|
|
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);
|
|
if (!cxt->pstore.buf) {
|
|
pr_err("cannot allocate pstore buffer\n");
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|
goto fail_clear;
|
|
}
|
|
|
|
err = pstore_register(&cxt->pstore);
|
|
if (err) {
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pr_err("registering with pstore failed\n");
|
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goto fail_buf;
|
|
}
|
|
|
|
/*
|
|
* Update the module parameter variables as well so they are visible
|
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* through /sys/module/ramoops/parameters/
|
|
*/
|
|
mem_size = pdata->mem_size;
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mem_address = pdata->mem_address;
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record_size = pdata->record_size;
|
|
dump_oops = pdata->dump_oops;
|
|
|
|
pr_info("attached 0x%lx@0x%llx, ecc: %d\n",
|
|
cxt->size, (unsigned long long)cxt->phys_addr,
|
|
cxt->ecc_size);
|
|
|
|
return 0;
|
|
|
|
fail_buf:
|
|
kfree(cxt->pstore.buf);
|
|
fail_clear:
|
|
cxt->pstore.bufsize = 0;
|
|
cxt->max_dump_cnt = 0;
|
|
fail_cnt:
|
|
kfree(cxt->fprz);
|
|
fail_init_fprz:
|
|
kfree(cxt->cprz);
|
|
fail_init_cprz:
|
|
ramoops_free_przs(cxt);
|
|
fail_out:
|
|
return err;
|
|
}
|
|
|
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static int __exit ramoops_remove(struct platform_device *pdev)
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{
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#if 0
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/* TODO(kees): We cannot unload ramoops since pstore doesn't support
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* unregistering yet.
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*/
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struct ramoops_context *cxt = &oops_cxt;
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iounmap(cxt->virt_addr);
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release_mem_region(cxt->phys_addr, cxt->size);
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cxt->max_dump_cnt = 0;
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/* TODO(kees): When pstore supports unregistering, call it here. */
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kfree(cxt->pstore.buf);
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cxt->pstore.bufsize = 0;
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return 0;
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#endif
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return -EBUSY;
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}
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|
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static struct platform_driver ramoops_driver = {
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.probe = ramoops_probe,
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.remove = __exit_p(ramoops_remove),
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.driver = {
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.name = "ramoops",
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.owner = THIS_MODULE,
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},
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|
};
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static void ramoops_register_dummy(void)
|
|
{
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|
if (!mem_size)
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return;
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|
|
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pr_info("using module parameters\n");
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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 = mem_address;
|
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dummy_data->record_size = record_size;
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dummy_data->console_size = ramoops_console_size;
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dummy_data->ftrace_size = ramoops_ftrace_size;
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dummy_data->dump_oops = dump_oops;
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/*
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* For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
|
|
* (using 1 byte for ECC isn't much of use anyway).
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|
*/
|
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dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
|
|
|
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dummy = platform_device_register_data(NULL, "ramoops", -1,
|
|
dummy_data, sizeof(struct ramoops_platform_data));
|
|
if (IS_ERR(dummy)) {
|
|
pr_info("could not create platform device: %ld\n",
|
|
PTR_ERR(dummy));
|
|
}
|
|
}
|
|
|
|
static int __init ramoops_init(void)
|
|
{
|
|
ramoops_register_dummy();
|
|
return platform_driver_register(&ramoops_driver);
|
|
}
|
|
postcore_initcall(ramoops_init);
|
|
|
|
static void __exit ramoops_exit(void)
|
|
{
|
|
platform_driver_unregister(&ramoops_driver);
|
|
platform_device_unregister(dummy);
|
|
kfree(dummy_data);
|
|
}
|
|
module_exit(ramoops_exit);
|
|
|
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
|
|
MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
|