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-rw-r--r--drivers/char/ramoops.c362
1 files changed, 0 insertions, 362 deletions
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
deleted file mode 100644
index b8b8542a5105..000000000000
--- a/drivers/char/ramoops.c
+++ /dev/null
@@ -1,362 +0,0 @@
-/*
- * RAM Oops/Panic logger
- *
- * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
- * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
- *
- * 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/pstore.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)");
-
-struct ramoops_context {
- void *virt_addr;
- phys_addr_t phys_addr;
- unsigned long size;
- size_t record_size;
- int dump_oops;
- unsigned int count;
- unsigned int max_count;
- unsigned int read_count;
- struct pstore_info pstore;
-};
-
-static struct platform_device *dummy;
-static struct ramoops_platform_data *dummy_data;
-
-static int ramoops_pstore_open(struct pstore_info *psi)
-{
- struct ramoops_context *cxt = psi->data;
-
- cxt->read_count = 0;
- return 0;
-}
-
-static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
- struct timespec *time,
- char **buf,
- struct pstore_info *psi)
-{
- ssize_t size;
- char *rambuf;
- struct ramoops_context *cxt = psi->data;
-
- if (cxt->read_count >= cxt->max_count)
- return -EINVAL;
- *id = cxt->read_count++;
- /* Only supports dmesg output so far. */
- *type = PSTORE_TYPE_DMESG;
- /* TODO(kees): Bogus time for the moment. */
- time->tv_sec = 0;
- time->tv_nsec = 0;
-
- rambuf = cxt->virt_addr + (*id * cxt->record_size);
- size = strnlen(rambuf, cxt->record_size);
- *buf = kmalloc(size, GFP_KERNEL);
- if (*buf == NULL)
- return -ENOMEM;
- memcpy(*buf, rambuf, size);
-
- return size;
-}
-
-static int ramoops_pstore_write(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id,
- unsigned int part,
- size_t size, struct pstore_info *psi)
-{
- char *buf;
- size_t res;
- struct timeval timestamp;
- struct ramoops_context *cxt = psi->data;
- size_t available = cxt->record_size;
-
- /* Currently ramoops is designed to only store dmesg dumps. */
- if (type != PSTORE_TYPE_DMESG)
- return -EINVAL;
-
- /* Out of the various dmesg dump types, ramoops is currently designed
- * to only store crash logs, rather than storing general kernel logs.
- */
- if (reason != KMSG_DUMP_OOPS &&
- reason != KMSG_DUMP_PANIC)
- return -EINVAL;
-
- /* Skip Oopes when configured to do so. */
- if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
- return -EINVAL;
-
- /* Explicitly only take the first part of any new crash.
- * If our buffer is larger than kmsg_bytes, this can never happen,
- * and if our buffer is smaller than kmsg_bytes, we don't want the
- * report split across multiple records.
- */
- if (part != 1)
- return -ENOSPC;
-
- buf = cxt->virt_addr + (cxt->count * cxt->record_size);
-
- res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR);
- buf += res;
- available -= res;
-
- do_gettimeofday(&timestamp);
- res = sprintf(buf, "%lu.%lu\n", (long)timestamp.tv_sec, (long)timestamp.tv_usec);
- buf += res;
- available -= res;
-
- if (size > available)
- size = available;
-
- memcpy(buf, cxt->pstore.buf, size);
- memset(buf + size, '\0', available - size);
-
- cxt->count = (cxt->count + 1) % cxt->max_count;
-
- return 0;
-}
-
-static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
- struct pstore_info *psi)
-{
- char *buf;
- struct ramoops_context *cxt = psi->data;
-
- if (id >= cxt->max_count)
- return -EINVAL;
-
- buf = cxt->virt_addr + (id * cxt->record_size);
- memset(buf, '\0', cxt->record_size);
-
- return 0;
-}
-
-static struct ramoops_context oops_cxt = {
- .pstore = {
- .owner = THIS_MODULE,
- .name = "ramoops",
- .open = ramoops_pstore_open,
- .read = ramoops_pstore_read,
- .write = ramoops_pstore_write,
- .erase = ramoops_pstore_erase,
- },
-};
-
-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;
-
- /* Only a single ramoops area allowed at a time, so fail extra
- * probes.
- */
- if (cxt->max_count)
- goto fail_out;
-
- if (!pdata->mem_size || !pdata->record_size) {
- pr_err("The memory size and the record size must be "
- "non-zero\n");
- goto fail_out;
- }
-
- 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, minimum is %lu\n",
- MIN_MEM_SIZE);
- goto fail_out;
- }
-
- if (pdata->mem_size < pdata->record_size) {
- pr_err("The memory size must be larger than the "
- "records size\n");
- goto fail_out;
- }
-
- 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;
-
- cxt->pstore.data = cxt;
- cxt->pstore.bufsize = cxt->record_size;
- cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
- spin_lock_init(&cxt->pstore.buf_lock);
- if (!cxt->pstore.buf) {
- pr_err("cannot allocate pstore buffer\n");
- goto fail_clear;
- }
-
- if (!request_mem_region(cxt->phys_addr, cxt->size, "ramoops")) {
- pr_err("request mem region (0x%lx@0x%llx) failed\n",
- cxt->size, (unsigned long long)cxt->phys_addr);
- err = -EINVAL;
- goto fail_buf;
- }
-
- cxt->virt_addr = ioremap(cxt->phys_addr, cxt->size);
- if (!cxt->virt_addr) {
- pr_err("ioremap failed\n");
- goto fail_mem_region;
- }
-
- err = pstore_register(&cxt->pstore);
- if (err) {
- pr_err("registering with pstore failed\n");
- goto fail_iounmap;
- }
-
- /*
- * 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;
-
- pr_info("attached 0x%lx@0x%llx (%ux0x%zx)\n",
- cxt->size, (unsigned long long)cxt->phys_addr,
- cxt->max_count, cxt->record_size);
-
- return 0;
-
-fail_iounmap:
- iounmap(cxt->virt_addr);
-fail_mem_region:
- release_mem_region(cxt->phys_addr, cxt->size);
-fail_buf:
- kfree(cxt->pstore.buf);
-fail_clear:
- cxt->pstore.bufsize = 0;
- cxt->max_count = 0;
-fail_out:
- return err;
-}
-
-static int __exit ramoops_remove(struct platform_device *pdev)
-{
-#if 0
- /* TODO(kees): We cannot unload ramoops since pstore doesn't support
- * unregistering yet.
- */
- struct ramoops_context *cxt = &oops_cxt;
-
- iounmap(cxt->virt_addr);
- release_mem_region(cxt->phys_addr, cxt->size);
- cxt->max_count = 0;
-
- /* TODO(kees): When pstore supports unregistering, call it here. */
- kfree(cxt->pstore.buf);
- cxt->pstore.bufsize = 0;
-
- return 0;
-#endif
- return -EBUSY;
-}
-
-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 (git 2.25.1) at 2024-11-23 18:05:53 +0000