ramoops: Move to fs/pstore/ram.c
Since ramoops was converted to pstore, it has nothing to do with character devices nowadays. Instead, today it is just a RAM backend for pstore. The patch just moves things around. There are a few changes were needed because of the move: 1. Kconfig and Makefiles fixups, of course. 2. In pstore/ram.c we have to play a bit with MODULE_PARAM_PREFIX, this is needed to keep user experience the same as with ramoops driver (i.e. so that ramoops.foo kernel command line arguments would still work). Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Marco Stornelli <marco.stornelli@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov
committed by
Greg Kroah-Hartman
Greg Kroah-Hartman
부모
d109a674a3
커밋
1894a253db
362
fs/pstore/ram.c
Normal file
362
fs/pstore/ram.c
Normal file
@@ -0,0 +1,362 @@
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/*
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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/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/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 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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struct ramoops_context {
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void *virt_addr;
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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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int dump_oops;
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unsigned int count;
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unsigned int max_count;
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unsigned int read_count;
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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->read_count = 0;
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return 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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struct timespec *time,
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char **buf,
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struct pstore_info *psi)
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{
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ssize_t size;
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char *rambuf;
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struct ramoops_context *cxt = psi->data;
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if (cxt->read_count >= cxt->max_count)
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return -EINVAL;
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*id = cxt->read_count++;
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/* Only supports dmesg output so far. */
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*type = PSTORE_TYPE_DMESG;
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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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rambuf = cxt->virt_addr + (*id * cxt->record_size);
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size = strnlen(rambuf, cxt->record_size);
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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, rambuf, size);
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return size;
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}
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static int ramoops_pstore_write(enum pstore_type_id type,
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enum kmsg_dump_reason reason,
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u64 *id,
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unsigned int part,
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size_t size, struct pstore_info *psi)
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{
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char *buf;
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size_t res;
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struct timeval timestamp;
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struct ramoops_context *cxt = psi->data;
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size_t available = cxt->record_size;
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/* Currently ramoops is designed to only store dmesg dumps. */
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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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buf = cxt->virt_addr + (cxt->count * cxt->record_size);
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res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR);
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buf += res;
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available -= res;
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do_gettimeofday(×tamp);
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res = sprintf(buf, "%lu.%lu\n", (long)timestamp.tv_sec, (long)timestamp.tv_usec);
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buf += res;
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available -= res;
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if (size > available)
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size = available;
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memcpy(buf, cxt->pstore.buf, size);
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memset(buf + size, '\0', available - size);
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cxt->count = (cxt->count + 1) % cxt->max_count;
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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,
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struct pstore_info *psi)
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{
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char *buf;
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struct ramoops_context *cxt = psi->data;
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if (id >= cxt->max_count)
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return -EINVAL;
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buf = cxt->virt_addr + (id * cxt->record_size);
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memset(buf, '\0', cxt->record_size);
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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 = ramoops_pstore_write,
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.erase = ramoops_pstore_erase,
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},
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};
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static int __init ramoops_probe(struct platform_device *pdev)
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{
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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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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_count)
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goto fail_out;
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if (!pdata->mem_size || !pdata->record_size) {
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pr_err("The memory size and the record 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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pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
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pdata->record_size = rounddown_pow_of_two(pdata->record_size);
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/* Check for the minimum memory size */
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if (pdata->mem_size < MIN_MEM_SIZE &&
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pdata->record_size < MIN_MEM_SIZE) {
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pr_err("memory size too small, minimum is %lu\n",
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MIN_MEM_SIZE);
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goto fail_out;
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}
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if (pdata->mem_size < pdata->record_size) {
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pr_err("The memory size must be larger than the "
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"records size\n");
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goto fail_out;
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}
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cxt->max_count = pdata->mem_size / pdata->record_size;
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cxt->count = 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->dump_oops = pdata->dump_oops;
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cxt->pstore.data = cxt;
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cxt->pstore.bufsize = cxt->record_size;
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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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goto fail_clear;
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}
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if (!request_mem_region(cxt->phys_addr, cxt->size, "ramoops")) {
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pr_err("request mem region (0x%lx@0x%llx) failed\n",
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cxt->size, (unsigned long long)cxt->phys_addr);
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err = -EINVAL;
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goto fail_buf;
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}
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cxt->virt_addr = ioremap(cxt->phys_addr, cxt->size);
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if (!cxt->virt_addr) {
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pr_err("ioremap failed\n");
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goto fail_mem_region;
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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_iounmap;
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}
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/*
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* Update the module parameter variables as well so they are visible
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* through /sys/module/ramoops/parameters/
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*/
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mem_size = pdata->mem_size;
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mem_address = pdata->mem_address;
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record_size = pdata->record_size;
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dump_oops = pdata->dump_oops;
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pr_info("attached 0x%lx@0x%llx (%ux0x%zx)\n",
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cxt->size, (unsigned long long)cxt->phys_addr,
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cxt->max_count, cxt->record_size);
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return 0;
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fail_iounmap:
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iounmap(cxt->virt_addr);
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fail_mem_region:
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release_mem_region(cxt->phys_addr, cxt->size);
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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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cxt->max_count = 0;
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fail_out:
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return err;
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}
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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_count = 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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static struct platform_driver ramoops_driver = {
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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 int __init ramoops_init(void)
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{
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int ret;
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ret = platform_driver_probe(&ramoops_driver, ramoops_probe);
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if (ret == -ENODEV) {
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/*
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* If we didn't find a platform device, we use module parameters
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* building platform data on the fly.
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*/
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pr_info("platform device not found, using module parameters\n");
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dummy_data = kzalloc(sizeof(struct ramoops_platform_data),
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GFP_KERNEL);
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if (!dummy_data)
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return -ENOMEM;
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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->dump_oops = dump_oops;
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dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
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NULL, 0, dummy_data,
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sizeof(struct ramoops_platform_data));
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if (IS_ERR(dummy))
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ret = PTR_ERR(dummy);
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else
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ret = 0;
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}
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return ret;
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}
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static void __exit ramoops_exit(void)
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{
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platform_driver_unregister(&ramoops_driver);
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kfree(dummy_data);
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}
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module_init(ramoops_init);
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module_exit(ramoops_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
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MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
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