linux/fs/pstore/ram.c
Joel Fernandes a1cf53ac6d ramoops: Split ftrace buffer space into per-CPU zones
If the RAMOOPS_FLAG_FTRACE_PER_CPU flag is passed to ramoops pdata, split
the ftrace space into multiple zones depending on the number of CPUs.

This speeds up the performance of function tracing by about 280% in my
tests as we avoid the locking. The trade off being lesser space available
per CPU. Let the ramoops user decide which option they want based on pdata
flag.

Signed-off-by: Joel Fernandes <joelaf@google.com>
[kees: added max_ftrace_cnt to track size, added DT logic and docs]
Signed-off-by: Kees Cook <keescook@chromium.org>
2016-11-15 16:34:26 -08:00

839 lines
21 KiB
C

/*
* 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/version.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/compiler.h>
#include <linux/pstore_ram.h>
#include <linux/of.h>
#include <linux/of_address.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 ramoops_console_size = MIN_MEM_SIZE;
module_param_named(console_size, ramoops_console_size, ulong, 0400);
MODULE_PARM_DESC(console_size, "size of kernel console log");
static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
MODULE_PARM_DESC(pmsg_size, "size of user space message log");
static unsigned long long mem_address;
module_param(mem_address, ullong, 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 unsigned int mem_type;
module_param(mem_type, uint, 0600);
MODULE_PARM_DESC(mem_type,
"set to 1 to try to use unbuffered memory (default 0)");
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 int ramoops_ecc;
module_param_named(ecc, ramoops_ecc, int, 0600);
MODULE_PARM_DESC(ramoops_ecc,
"if non-zero, the option enables ECC support and specifies "
"ECC buffer size in bytes (1 is a special value, means 16 "
"bytes ECC)");
struct ramoops_context {
struct persistent_ram_zone **przs;
struct persistent_ram_zone *cprz;
struct persistent_ram_zone **fprzs;
struct persistent_ram_zone *mprz;
phys_addr_t phys_addr;
unsigned long size;
unsigned int memtype;
size_t record_size;
size_t console_size;
size_t ftrace_size;
size_t pmsg_size;
int dump_oops;
u32 flags;
struct persistent_ram_ecc_info ecc_info;
unsigned int max_dump_cnt;
unsigned int dump_write_cnt;
/* _read_cnt need clear on ramoops_pstore_open */
unsigned int dump_read_cnt;
unsigned int console_read_cnt;
unsigned int max_ftrace_cnt;
unsigned int ftrace_read_cnt;
unsigned int pmsg_read_cnt;
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->dump_read_cnt = 0;
cxt->console_read_cnt = 0;
cxt->ftrace_read_cnt = 0;
cxt->pmsg_read_cnt = 0;
return 0;
}
static struct persistent_ram_zone *
ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
u64 *id,
enum pstore_type_id *typep, enum pstore_type_id type,
bool update)
{
struct persistent_ram_zone *prz;
int i = (*c)++;
if (i >= max)
return NULL;
prz = przs[i];
if (!prz)
return NULL;
/* Update old/shadowed buffer. */
if (update)
persistent_ram_save_old(prz);
if (!persistent_ram_old_size(prz))
return NULL;
*typep = type;
*id = i;
return prz;
}
static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
bool *compressed)
{
char data_type;
int header_length = 0;
if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
&time->tv_nsec, &data_type, &header_length) == 3) {
if (data_type == 'C')
*compressed = true;
else
*compressed = false;
} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
&time->tv_sec, &time->tv_nsec, &header_length) == 2) {
*compressed = false;
} else {
time->tv_sec = 0;
time->tv_nsec = 0;
*compressed = false;
}
return header_length;
}
static bool prz_ok(struct persistent_ram_zone *prz)
{
return !!prz && !!(persistent_ram_old_size(prz) +
persistent_ram_ecc_string(prz, NULL, 0));
}
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
char **buf, bool *compressed,
ssize_t *ecc_notice_size,
struct pstore_info *psi)
{
ssize_t size;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz = NULL;
int header_length = 0;
/* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
* PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
* valid time stamps, so it is initialized to zero.
*/
time->tv_sec = 0;
time->tv_nsec = 0;
*compressed = false;
/* Find the next valid persistent_ram_zone for DMESG */
while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz))
continue;
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
time, compressed);
/* Clear and skip this DMESG record if it has no valid header */
if (!header_length) {
persistent_ram_free_old(prz);
persistent_ram_zap(prz);
prz = NULL;
}
}
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0);
if (!prz_ok(prz)) {
while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt && !prz) {
prz = ramoops_get_next_prz(cxt->fprzs,
&cxt->ftrace_read_cnt,
cxt->max_ftrace_cnt, id, type,
PSTORE_TYPE_FTRACE, 0);
if (!prz_ok(prz))
continue;
}
}
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
1, id, type, PSTORE_TYPE_PMSG, 0);
if (!prz_ok(prz))
return 0;
size = persistent_ram_old_size(prz) - header_length;
/* ECC correction notice */
*ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
*buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
return size;
}
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
bool compressed)
{
char *hdr;
struct timespec timestamp;
size_t len;
/* Report zeroed timestamp if called before timekeeping has resumed. */
if (__getnstimeofday(&timestamp)) {
timestamp.tv_sec = 0;
timestamp.tv_nsec = 0;
}
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
(long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
compressed ? 'C' : 'D');
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
kfree(hdr);
return len;
}
static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
const char *buf,
bool compressed, size_t size,
struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;
size_t hlen;
if (type == PSTORE_TYPE_CONSOLE) {
if (!cxt->cprz)
return -ENOMEM;
persistent_ram_write(cxt->cprz, buf, size);
return 0;
} else if (type == PSTORE_TYPE_FTRACE) {
int zonenum;
if (!cxt->fprzs)
return -ENOMEM;
/*
* Choose zone by if we're using per-cpu buffers.
*/
if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
zonenum = smp_processor_id();
else
zonenum = 0;
persistent_ram_write(cxt->fprzs[zonenum], buf, size);
return 0;
} else if (type == PSTORE_TYPE_PMSG) {
pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
return -EINVAL;
}
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;
if (!cxt->przs)
return -ENOSPC;
prz = cxt->przs[cxt->dump_write_cnt];
hlen = ramoops_write_kmsg_hdr(prz, compressed);
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
persistent_ram_write(prz, buf, size);
cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
return 0;
}
static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
const char __user *buf,
bool compressed, size_t size,
struct pstore_info *psi)
{
if (type == PSTORE_TYPE_PMSG) {
struct ramoops_context *cxt = psi->data;
if (!cxt->mprz)
return -ENOMEM;
return persistent_ram_write_user(cxt->mprz, buf, size);
}
return -EINVAL;
}
static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
struct timespec time, struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;
switch (type) {
case PSTORE_TYPE_DMESG:
if (id >= cxt->max_dump_cnt)
return -EINVAL;
prz = cxt->przs[id];
break;
case PSTORE_TYPE_CONSOLE:
prz = cxt->cprz;
break;
case PSTORE_TYPE_FTRACE:
if (id >= cxt->max_ftrace_cnt)
return -EINVAL;
prz = cxt->fprzs[id];
break;
case PSTORE_TYPE_PMSG:
prz = cxt->mprz;
break;
default:
return -EINVAL;
}
persistent_ram_free_old(prz);
persistent_ram_zap(prz);
return 0;
}
static struct ramoops_context oops_cxt = {
.pstore = {
.owner = THIS_MODULE,
.name = "ramoops",
.open = ramoops_pstore_open,
.read = ramoops_pstore_read,
.write_buf = ramoops_pstore_write_buf,
.write_buf_user = ramoops_pstore_write_buf_user,
.erase = ramoops_pstore_erase,
},
};
static void ramoops_free_przs(struct ramoops_context *cxt)
{
int i;
/* Free dump PRZs */
if (cxt->przs) {
for (i = 0; i < cxt->max_dump_cnt; i++)
persistent_ram_free(cxt->przs[i]);
kfree(cxt->przs);
cxt->max_dump_cnt = 0;
}
/* Free ftrace PRZs */
if (cxt->fprzs) {
for (i = 0; i < cxt->max_ftrace_cnt; i++)
persistent_ram_free(cxt->fprzs[i]);
kfree(cxt->fprzs);
cxt->max_ftrace_cnt = 0;
}
}
static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
struct persistent_ram_zone ***przs,
phys_addr_t *paddr, size_t mem_sz,
ssize_t record_size,
unsigned int *cnt, u32 sig, u32 flags)
{
int err = -ENOMEM;
int i;
size_t zone_sz;
struct persistent_ram_zone **prz_ar;
/* Allocate nothing for 0 mem_sz or 0 record_size. */
if (mem_sz == 0 || record_size == 0) {
*cnt = 0;
return 0;
}
/*
* If we have a negative record size, calculate it based on
* mem_sz / *cnt. If we have a positive record size, calculate
* cnt from mem_sz / record_size.
*/
if (record_size < 0) {
if (*cnt == 0)
return 0;
record_size = mem_sz / *cnt;
if (record_size == 0)
goto fail;
} else {
*cnt = mem_sz / record_size;
if (*cnt == 0)
goto fail;
}
if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
mem_sz, (unsigned long long)*paddr,
cxt->size, (unsigned long long)cxt->phys_addr);
goto fail;
}
zone_sz = mem_sz / *cnt;
if (!zone_sz)
goto fail;
prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
if (!prz_ar)
goto fail;
for (i = 0; i < *cnt; i++) {
prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
&cxt->ecc_info,
cxt->memtype, flags);
if (IS_ERR(prz_ar[i])) {
err = PTR_ERR(prz_ar[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
record_size, (unsigned long long)*paddr, err);
while (i > 0) {
i--;
persistent_ram_free(prz_ar[i]);
}
kfree(prz_ar);
goto fail;
}
*paddr += zone_sz;
}
*przs = prz_ar;
return 0;
fail:
*cnt = 0;
return err;
}
static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
struct persistent_ram_zone **prz,
phys_addr_t *paddr, size_t sz, u32 sig)
{
if (!sz)
return 0;
if (*paddr + sz - cxt->phys_addr > cxt->size) {
dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
sz, (unsigned long long)*paddr,
cxt->size, (unsigned long long)cxt->phys_addr);
return -ENOMEM;
}
*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
cxt->memtype, 0);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
sz, (unsigned long long)*paddr, err);
return err;
}
persistent_ram_zap(*prz);
*paddr += sz;
return 0;
}
static int ramoops_parse_dt_size(struct platform_device *pdev,
const char *propname, u32 *value)
{
u32 val32 = 0;
int ret;
ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
if (ret < 0 && ret != -EINVAL) {
dev_err(&pdev->dev, "failed to parse property %s: %d\n",
propname, ret);
return ret;
}
if (val32 > INT_MAX) {
dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
return -EOVERFLOW;
}
*value = val32;
return 0;
}
static int ramoops_parse_dt(struct platform_device *pdev,
struct ramoops_platform_data *pdata)
{
struct device_node *of_node = pdev->dev.of_node;
struct resource *res;
u32 value;
int ret;
dev_dbg(&pdev->dev, "using Device Tree\n");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev,
"failed to locate DT /reserved-memory resource\n");
return -EINVAL;
}
pdata->mem_size = resource_size(res);
pdata->mem_address = res->start;
pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
#define parse_size(name, field) { \
ret = ramoops_parse_dt_size(pdev, name, &value); \
if (ret < 0) \
return ret; \
field = value; \
}
parse_size("record-size", pdata->record_size);
parse_size("console-size", pdata->console_size);
parse_size("ftrace-size", pdata->ftrace_size);
parse_size("pmsg-size", pdata->pmsg_size);
parse_size("ecc-size", pdata->ecc_info.ecc_size);
parse_size("flags", pdata->flags);
#undef parse_size
return 0;
}
static int ramoops_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ramoops_platform_data *pdata = dev->platform_data;
struct ramoops_context *cxt = &oops_cxt;
size_t dump_mem_sz;
phys_addr_t paddr;
int err = -EINVAL;
if (dev_of_node(dev) && !pdata) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
err = -ENOMEM;
goto fail_out;
}
err = ramoops_parse_dt(pdev, pdata);
if (err < 0)
goto fail_out;
}
/* Only a single ramoops area allowed at a time, so fail extra
* probes.
*/
if (cxt->max_dump_cnt)
goto fail_out;
if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
!pdata->ftrace_size && !pdata->pmsg_size)) {
pr_err("The memory size and the record/console size must be "
"non-zero\n");
goto fail_out;
}
if (pdata->record_size && !is_power_of_2(pdata->record_size))
pdata->record_size = rounddown_pow_of_two(pdata->record_size);
if (pdata->console_size && !is_power_of_2(pdata->console_size))
pdata->console_size = rounddown_pow_of_two(pdata->console_size);
if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
cxt->size = pdata->mem_size;
cxt->phys_addr = pdata->mem_address;
cxt->memtype = pdata->mem_type;
cxt->record_size = pdata->record_size;
cxt->console_size = pdata->console_size;
cxt->ftrace_size = pdata->ftrace_size;
cxt->pmsg_size = pdata->pmsg_size;
cxt->dump_oops = pdata->dump_oops;
cxt->flags = pdata->flags;
cxt->ecc_info = pdata->ecc_info;
paddr = cxt->phys_addr;
dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
- cxt->pmsg_size;
err = ramoops_init_przs(dev, cxt, &cxt->przs, &paddr, dump_mem_sz,
cxt->record_size, &cxt->max_dump_cnt, 0, 0);
if (err)
goto fail_out;
err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
cxt->console_size, 0);
if (err)
goto fail_init_cprz;
cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
? nr_cpu_ids
: 1;
err = ramoops_init_przs(dev, cxt, &cxt->fprzs, &paddr, cxt->ftrace_size,
-1, &cxt->max_ftrace_cnt,
LINUX_VERSION_CODE,
(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
? PRZ_FLAG_NO_LOCK : 0);
if (err)
goto fail_init_fprz;
err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
if (err)
goto fail_init_mprz;
cxt->pstore.data = cxt;
/*
* Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
* have to handle dumps, we must have at least record_size buffer. And
* for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
* ZERO_SIZE_PTR).
*/
if (cxt->console_size)
cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
if (!cxt->pstore.buf) {
pr_err("cannot allocate pstore buffer\n");
err = -ENOMEM;
goto fail_clear;
}
spin_lock_init(&cxt->pstore.buf_lock);
cxt->pstore.flags = PSTORE_FLAGS_DMESG;
if (cxt->console_size)
cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
if (cxt->ftrace_size)
cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
if (cxt->pmsg_size)
cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
err = pstore_register(&cxt->pstore);
if (err) {
pr_err("registering with pstore failed\n");
goto fail_buf;
}
/*
* 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;
ramoops_console_size = pdata->console_size;
ramoops_pmsg_size = pdata->pmsg_size;
ramoops_ftrace_size = pdata->ftrace_size;
pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
cxt->size, (unsigned long long)cxt->phys_addr,
cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
return 0;
fail_buf:
kfree(cxt->pstore.buf);
fail_clear:
cxt->pstore.bufsize = 0;
persistent_ram_free(cxt->mprz);
fail_init_mprz:
fail_init_fprz:
persistent_ram_free(cxt->cprz);
fail_init_cprz:
ramoops_free_przs(cxt);
fail_out:
return err;
}
static int ramoops_remove(struct platform_device *pdev)
{
struct ramoops_context *cxt = &oops_cxt;
pstore_unregister(&cxt->pstore);
kfree(cxt->pstore.buf);
cxt->pstore.bufsize = 0;
persistent_ram_free(cxt->mprz);
persistent_ram_free(cxt->cprz);
ramoops_free_przs(cxt);
return 0;
}
static const struct of_device_id dt_match[] = {
{ .compatible = "ramoops" },
{}
};
static struct platform_driver ramoops_driver = {
.probe = ramoops_probe,
.remove = ramoops_remove,
.driver = {
.name = "ramoops",
.of_match_table = dt_match,
},
};
static void ramoops_register_dummy(void)
{
if (!mem_size)
return;
pr_info("using module parameters\n");
dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
if (!dummy_data) {
pr_info("could not allocate pdata\n");
return;
}
dummy_data->mem_size = mem_size;
dummy_data->mem_address = mem_address;
dummy_data->mem_type = mem_type;
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;
dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
/*
* 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;
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);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");