summaryrefslogtreecommitdiffstats
path: root/drivers/char/ramoops.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/ramoops.c')
-rw-r--r--drivers/char/ramoops.c250
1 files changed, 0 insertions, 250 deletions
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
deleted file mode 100644
index 2a5e45d2a9f..00000000000
--- a/drivers/char/ramoops.c
+++ /dev/null
@@ -1,250 +0,0 @@
-/*
- * RAM Oops/Panic logger
- *
- * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/kmsg_dump.h>
-#include <linux/time.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/ramoops.h>
-
-#define RAMOOPS_KERNMSG_HDR "===="
-#define MIN_MEM_SIZE 4096UL
-
-static ulong record_size = MIN_MEM_SIZE;
-module_param(record_size, ulong, 0400);
-MODULE_PARM_DESC(record_size,
- "size of each dump done on oops/panic");
-
-static ulong mem_address;
-module_param(mem_address, ulong, 0400);
-MODULE_PARM_DESC(mem_address,
- "start of reserved RAM used to store oops/panic logs");
-
-static ulong mem_size;
-module_param(mem_size, ulong, 0400);
-MODULE_PARM_DESC(mem_size,
- "size of reserved RAM used to store oops/panic logs");
-
-static int dump_oops = 1;
-module_param(dump_oops, int, 0600);
-MODULE_PARM_DESC(dump_oops,
- "set to 1 to dump oopses, 0 to only dump panics (default 1)");
-
-static struct ramoops_context {
- struct kmsg_dumper dump;
- void *virt_addr;
- phys_addr_t phys_addr;
- unsigned long size;
- unsigned long record_size;
- int dump_oops;
- int count;
- int max_count;
-} oops_cxt;
-
-static struct platform_device *dummy;
-static struct ramoops_platform_data *dummy_data;
-
-static void ramoops_do_dump(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
- const char *s2, unsigned long l2)
-{
- struct ramoops_context *cxt = container_of(dumper,
- struct ramoops_context, dump);
- unsigned long s1_start, s2_start;
- unsigned long l1_cpy, l2_cpy;
- int res, hdr_size;
- char *buf, *buf_orig;
- struct timeval timestamp;
-
- if (reason != KMSG_DUMP_OOPS &&
- reason != KMSG_DUMP_PANIC)
- return;
-
- /* Only dump oopses if dump_oops is set */
- if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
- return;
-
- buf = cxt->virt_addr + (cxt->count * cxt->record_size);
- buf_orig = buf;
-
- memset(buf, '\0', cxt->record_size);
- res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR);
- buf += res;
- do_gettimeofday(&timestamp);
- res = sprintf(buf, "%lu.%lu\n", (long)timestamp.tv_sec, (long)timestamp.tv_usec);
- buf += res;
-
- hdr_size = buf - buf_orig;
- l2_cpy = min(l2, cxt->record_size - hdr_size);
- l1_cpy = min(l1, cxt->record_size - hdr_size - l2_cpy);
-
- s2_start = l2 - l2_cpy;
- s1_start = l1 - l1_cpy;
-
- memcpy(buf, s1 + s1_start, l1_cpy);
- memcpy(buf + l1_cpy, s2 + s2_start, l2_cpy);
-
- cxt->count = (cxt->count + 1) % cxt->max_count;
-}
-
-static int __init ramoops_probe(struct platform_device *pdev)
-{
- struct ramoops_platform_data *pdata = pdev->dev.platform_data;
- struct ramoops_context *cxt = &oops_cxt;
- int err = -EINVAL;
-
- if (!pdata->mem_size || !pdata->record_size) {
- pr_err("The memory size and the record size must be "
- "non-zero\n");
- goto fail3;
- }
-
- pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
- pdata->record_size = rounddown_pow_of_two(pdata->record_size);
-
- /* Check for the minimum memory size */
- if (pdata->mem_size < MIN_MEM_SIZE &&
- pdata->record_size < MIN_MEM_SIZE) {
- pr_err("memory size too small, minium is %lu\n", MIN_MEM_SIZE);
- goto fail3;
- }
-
- if (pdata->mem_size < pdata->record_size) {
- pr_err("The memory size must be larger than the "
- "records size\n");
- goto fail3;
- }
-
- cxt->max_count = pdata->mem_size / pdata->record_size;
- cxt->count = 0;
- cxt->size = pdata->mem_size;
- cxt->phys_addr = pdata->mem_address;
- cxt->record_size = pdata->record_size;
- cxt->dump_oops = pdata->dump_oops;
-
- if (!request_mem_region(cxt->phys_addr, cxt->size, "ramoops")) {
- pr_err("request mem region failed\n");
- err = -EINVAL;
- goto fail3;
- }
-
- cxt->virt_addr = ioremap(cxt->phys_addr, cxt->size);
- if (!cxt->virt_addr) {
- pr_err("ioremap failed\n");
- goto fail2;
- }
-
- cxt->dump.dump = ramoops_do_dump;
- err = kmsg_dump_register(&cxt->dump);
- if (err) {
- pr_err("registering kmsg dumper failed\n");
- goto fail1;
- }
-
- /*
- * Update the module parameter variables as well so they are visible
- * through /sys/module/ramoops/parameters/
- */
- mem_size = pdata->mem_size;
- mem_address = pdata->mem_address;
- record_size = pdata->record_size;
- dump_oops = pdata->dump_oops;
-
- return 0;
-
-fail1:
- iounmap(cxt->virt_addr);
-fail2:
- release_mem_region(cxt->phys_addr, cxt->size);
-fail3:
- return err;
-}
-
-static int __exit ramoops_remove(struct platform_device *pdev)
-{
- struct ramoops_context *cxt = &oops_cxt;
-
- if (kmsg_dump_unregister(&cxt->dump) < 0)
- pr_warn("could not unregister kmsg_dumper\n");
-
- iounmap(cxt->virt_addr);
- release_mem_region(cxt->phys_addr, cxt->size);
- return 0;
-}
-
-static struct platform_driver ramoops_driver = {
- .remove = __exit_p(ramoops_remove),
- .driver = {
- .name = "ramoops",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init ramoops_init(void)
-{
- int ret;
- ret = platform_driver_probe(&ramoops_driver, ramoops_probe);
- if (ret == -ENODEV) {
- /*
- * If we didn't find a platform device, we use module parameters
- * building platform data on the fly.
- */
- pr_info("platform device not found, using module parameters\n");
- dummy_data = kzalloc(sizeof(struct ramoops_platform_data),
- GFP_KERNEL);
- if (!dummy_data)
- return -ENOMEM;
- dummy_data->mem_size = mem_size;
- dummy_data->mem_address = mem_address;
- dummy_data->record_size = record_size;
- dummy_data->dump_oops = dump_oops;
- dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
- NULL, 0, dummy_data,
- sizeof(struct ramoops_platform_data));
-
- if (IS_ERR(dummy))
- ret = PTR_ERR(dummy);
- else
- ret = 0;
- }
-
- return ret;
-}
-
-static void __exit ramoops_exit(void)
-{
- platform_driver_unregister(&ramoops_driver);
- kfree(dummy_data);
-}
-
-module_init(ramoops_init);
-module_exit(ramoops_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
-MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-21 03:49:49 +0000