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powerpc/nvram: Move generic code for nvram and pstore 

With minor checks, we can move most of the code for nvram
under pseries to a common place to be re-used by other
powerpc platforms like powernv. This patch moves such
common code to arch/powerpc/kernel/nvram_64.c file.

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
[mpe: Move select of ZLIB_DEFLATE to PPC64 to fix the build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Hari Bathini 2015-02-06 01:06:04 +05:30 committed by Michael Ellerman
parent 3af229f207
commit 78989f0a55
6 changed files with 715 additions and 663 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
arch/powerpc/include/asm/nvram.h
View File

@ -9,12 +9,43 @@
#ifndef _ASM_POWERPC_NVRAM_H
#define _ASM_POWERPC_NVRAM_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <uapi/asm/nvram.h>
/*
* Set oops header version to distinguish between old and new format header.
* lnx,oops-log partition max size is 4000, header version > 4000 will
* help in identifying new header.
*/
#define OOPS_HDR_VERSION 5000
struct err_log_info {
__be32 error_type;
__be32 seq_num;
};
struct nvram_os_partition {
const char *name;
int req_size; /* desired size, in bytes */
int min_size; /* minimum acceptable size (0 means req_size) */
long size; /* size of data portion (excluding err_log_info) */
long index; /* offset of data portion of partition */
bool os_partition; /* partition initialized by OS, not FW */
};
struct oops_log_info {
__be16 version;
__be16 report_length;
__be64 timestamp;
} __attribute__((packed));
extern struct nvram_os_partition oops_log_partition;
#ifdef CONFIG_PPC_PSERIES
extern struct nvram_os_partition rtas_log_partition;
extern int nvram_write_error_log(char * buff, int length,
unsigned int err_type, unsigned int err_seq);
extern int nvram_read_error_log(char * buff, int length,
@ -50,6 +81,23 @@ extern void pmac_xpram_write(int xpaddr, u8 data);
/* Synchronize NVRAM */
extern void nvram_sync(void);
/* Initialize NVRAM OS partition */
extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
/* Initialize NVRAM oops partition */
extern void __init nvram_init_oops_partition(int rtas_partition_exists);
/* Read a NVRAM partition */
extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
int length, unsigned int *err_type,
unsigned int *error_log_cnt);
/* Write to NVRAM OS partition */
extern int nvram_write_os_partition(struct nvram_os_partition *part,
char *buff, int length,
unsigned int err_type,
unsigned int error_log_cnt);
/* Determine NVRAM size */
extern ssize_t nvram_get_size(void);

4
arch/powerpc/include/asm/rtas.h
View File

@ -343,8 +343,12 @@ extern int early_init_dt_scan_rtas(unsigned long node,
extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
#ifdef CONFIG_PPC_PSERIES
extern unsigned long last_rtas_event;
extern int clobbering_unread_rtas_event(void);
extern int pseries_devicetree_update(s32 scope);
extern void post_mobility_fixup(void);
#else
static inline int clobbering_unread_rtas_event(void) { return 0; }
#endif
#ifdef CONFIG_PPC_RTAS_DAEMON

656
arch/powerpc/kernel/nvram_64.c
View File

@ -26,6 +26,9 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/kmsg_dump.h>
#include <linux/pstore.h>
#include <linux/zlib.h>
#include <asm/uaccess.h>
#include <asm/nvram.h>
#include <asm/rtas.h>
@ -54,6 +57,659 @@ struct nvram_partition {
static LIST_HEAD(nvram_partitions);
#ifdef CONFIG_PPC_PSERIES
struct nvram_os_partition rtas_log_partition = {
.name = "ibm,rtas-log",
.req_size = 2079,
.min_size = 1055,
.index = -1,
.os_partition = true
};
#endif
struct nvram_os_partition oops_log_partition = {
.name = "lnx,oops-log",
.req_size = 4000,
.min_size = 2000,
.index = -1,
.os_partition = true
};
static const char *nvram_os_partitions[] = {
#ifdef CONFIG_PPC_PSERIES
"ibm,rtas-log",
#endif
"lnx,oops-log",
NULL
};
static void oops_to_nvram(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason);
static struct kmsg_dumper nvram_kmsg_dumper = {
.dump = oops_to_nvram
};
/*
* For capturing and compressing an oops or panic report...
* big_oops_buf[] holds the uncompressed text we're capturing.
*
* oops_buf[] holds the compressed text, preceded by a oops header.
* oops header has u16 holding the version of oops header (to differentiate
* between old and new format header) followed by u16 holding the length of
* the compressed* text (*Or uncompressed, if compression fails.) and u64
* holding the timestamp. oops_buf[] gets written to NVRAM.
*
* oops_log_info points to the header. oops_data points to the compressed text.
*
* +- oops_buf
* | +- oops_data
* v v
* +-----------+-----------+-----------+------------------------+
* | version | length | timestamp | text |
* | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
* +-----------+-----------+-----------+------------------------+
* ^
* +- oops_log_info
*
* We preallocate these buffers during init to avoid kmalloc during oops/panic.
*/
static size_t big_oops_buf_sz;
static char *big_oops_buf, *oops_buf;
static char *oops_data;
static size_t oops_data_sz;
/* Compression parameters */
#define COMPR_LEVEL 6
#define WINDOW_BITS 12
#define MEM_LEVEL 4
static struct z_stream_s stream;
#ifdef CONFIG_PSTORE
#ifdef CONFIG_PPC_PSERIES
static struct nvram_os_partition of_config_partition = {
.name = "of-config",
.index = -1,
.os_partition = false
};
#endif
static struct nvram_os_partition common_partition = {
.name = "common",
.index = -1,
.os_partition = false
};
static enum pstore_type_id nvram_type_ids[] = {
PSTORE_TYPE_DMESG,
PSTORE_TYPE_PPC_COMMON,
-1,
-1,
-1
};
static int read_type;
#endif
/* nvram_write_os_partition
*
* We need to buffer the error logs into nvram to ensure that we have
* the failure information to decode. If we have a severe error there
* is no way to guarantee that the OS or the machine is in a state to
* get back to user land and write the error to disk. For example if
* the SCSI device driver causes a Machine Check by writing to a bad
* IO address, there is no way of guaranteeing that the device driver
* is in any state that is would also be able to write the error data
* captured to disk, thus we buffer it in NVRAM for analysis on the
* next boot.
*
* In NVRAM the partition containing the error log buffer will looks like:
* Header (in bytes):
* +-----------+----------+--------+------------+------------------+
* | signature | checksum | length | name | data |
* |0 |1 |2 3|4 15|16 length-1|
* +-----------+----------+--------+------------+------------------+
*
* The 'data' section would look like (in bytes):
* +--------------+------------+-----------------------------------+
* | event_logged | sequence # | error log |
* |0 3|4 7|8 error_log_size-1|
* +--------------+------------+-----------------------------------+
*
* event_logged: 0 if event has not been logged to syslog, 1 if it has
* sequence #: The unique sequence # for each event. (until it wraps)
* error log: The error log from event_scan
*/
int nvram_write_os_partition(struct nvram_os_partition *part,
char *buff, int length,
unsigned int err_type,
unsigned int error_log_cnt)
{
int rc;
loff_t tmp_index;
struct err_log_info info;
if (part->index == -1)
return -ESPIPE;
if (length > part->size)
length = part->size;
info.error_type = cpu_to_be32(err_type);
info.seq_num = cpu_to_be32(error_log_cnt);
tmp_index = part->index;
rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info),
&tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
return rc;
}
rc = ppc_md.nvram_write(buff, length, &tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
return rc;
}
return 0;
}
/* nvram_read_partition
*
* Reads nvram partition for at most 'length'
*/
int nvram_read_partition(struct nvram_os_partition *part, char *buff,
int length, unsigned int *err_type,
unsigned int *error_log_cnt)
{
int rc;
loff_t tmp_index;
struct err_log_info info;
if (part->index == -1)
return -1;
if (length > part->size)
length = part->size;
tmp_index = part->index;
if (part->os_partition) {
rc = ppc_md.nvram_read((char *)&info,
sizeof(struct err_log_info),
&tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
return rc;
}
}
rc = ppc_md.nvram_read(buff, length, &tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
return rc;
}
if (part->os_partition) {
*error_log_cnt = be32_to_cpu(info.seq_num);
*err_type = be32_to_cpu(info.error_type);
}
return 0;
}
/* nvram_init_os_partition
*
* This sets up a partition with an "OS" signature.
*
* The general strategy is the following:
* 1.) If a partition with the indicated name already exists...
* - If it's large enough, use it.
* - Otherwise, recycle it and keep going.
* 2.) Search for a free partition that is large enough.
* 3.) If there's not a free partition large enough, recycle any obsolete
* OS partitions and try again.
* 4.) Will first try getting a chunk that will satisfy the requested size.
* 5.) If a chunk of the requested size cannot be allocated, then try finding
* a chunk that will satisfy the minum needed.
*
* Returns 0 on success, else -1.
*/
int __init nvram_init_os_partition(struct nvram_os_partition *part)
{
loff_t p;
int size;
/* Look for ours */
p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
/* Found one but too small, remove it */
if (p && size < part->min_size) {
pr_info("nvram: Found too small %s partition,"
" removing it...\n", part->name);
nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
p = 0;
}
/* Create one if we didn't find */
if (!p) {
p = nvram_create_partition(part->name, NVRAM_SIG_OS,
part->req_size, part->min_size);
if (p == -ENOSPC) {
pr_info("nvram: No room to create %s partition, "
"deleting any obsolete OS partitions...\n",
part->name);
nvram_remove_partition(NULL, NVRAM_SIG_OS,
nvram_os_partitions);
p = nvram_create_partition(part->name, NVRAM_SIG_OS,
part->req_size, part->min_size);
}
}
if (p <= 0) {
pr_err("nvram: Failed to find or create %s"
" partition, err %d\n", part->name, (int)p);
return -1;
}
part->index = p;
part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
return 0;
}
/* Derived from logfs_compress() */
static int nvram_compress(const void *in, void *out, size_t inlen,
size_t outlen)
{
int err, ret;
ret = -EIO;
err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
MEM_LEVEL, Z_DEFAULT_STRATEGY);
if (err != Z_OK)
goto error;
stream.next_in = in;
stream.avail_in = inlen;
stream.total_in = 0;
stream.next_out = out;
stream.avail_out = outlen;
stream.total_out = 0;
err = zlib_deflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto error;
err = zlib_deflateEnd(&stream);
if (err != Z_OK)
goto error;
if (stream.total_out >= stream.total_in)
goto error;
ret = stream.total_out;
error:
return ret;
}
/* Compress the text from big_oops_buf into oops_buf. */
static int zip_oops(size_t text_len)
{
struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
oops_data_sz);
if (zipped_len < 0) {
pr_err("nvram: compression failed; returned %d\n", zipped_len);
pr_err("nvram: logging uncompressed oops/panic report\n");
return -1;
}
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
oops_hdr->report_length = cpu_to_be16(zipped_len);
oops_hdr->timestamp = cpu_to_be64(get_seconds());
return 0;
}
#ifdef CONFIG_PSTORE
static int nvram_pstore_open(struct pstore_info *psi)
{
/* Reset the iterator to start reading partitions again */
read_type = -1;
return 0;
}
/**
* nvram_pstore_write - pstore write callback for nvram
* @type: Type of message logged
* @reason: reason behind dump (oops/panic)
* @id: identifier to indicate the write performed
* @part: pstore writes data to registered buffer in parts,
* part number will indicate the same.
* @count: Indicates oops count
* @compressed: Flag to indicate the log is compressed
* @size: number of bytes written to the registered buffer
* @psi: registered pstore_info structure
*
* Called by pstore_dump() when an oops or panic report is logged in the
* printk buffer.
* Returns 0 on successful write.
*/
static int nvram_pstore_write(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part, int count,
bool compressed, size_t size,
struct pstore_info *psi)
{
int rc;
unsigned int err_type = ERR_TYPE_KERNEL_PANIC;
struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;
/* part 1 has the recent messages from printk buffer */
if (part > 1 || (type != PSTORE_TYPE_DMESG))
return -1;
if (clobbering_unread_rtas_event())
return -1;
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
oops_hdr->report_length = cpu_to_be16(size);
oops_hdr->timestamp = cpu_to_be64(get_seconds());
if (compressed)
err_type = ERR_TYPE_KERNEL_PANIC_GZ;
rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
(int) (sizeof(*oops_hdr) + size), err_type, count);
if (rc != 0)
return rc;
*id = part;
return 0;
}
/*
* Reads the oops/panic report, rtas, of-config and common partition.
* Returns the length of the data we read from each partition.
* Returns 0 if we've been called before.
*/
static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time, char **buf,
bool *compressed, struct pstore_info *psi)
{
struct oops_log_info *oops_hdr;
unsigned int err_type, id_no, size = 0;
struct nvram_os_partition *part = NULL;
char *buff = NULL;
int sig = 0;
loff_t p;
read_type++;
switch (nvram_type_ids[read_type]) {
case PSTORE_TYPE_DMESG:
part = &oops_log_partition;
*type = PSTORE_TYPE_DMESG;
break;
case PSTORE_TYPE_PPC_COMMON:
sig = NVRAM_SIG_SYS;
part = &common_partition;
*type = PSTORE_TYPE_PPC_COMMON;
*id = PSTORE_TYPE_PPC_COMMON;
time->tv_sec = 0;
time->tv_nsec = 0;
break;
#ifdef CONFIG_PPC_PSERIES
case PSTORE_TYPE_PPC_RTAS:
part = &rtas_log_partition;
*type = PSTORE_TYPE_PPC_RTAS;
time->tv_sec = last_rtas_event;
time->tv_nsec = 0;
break;
case PSTORE_TYPE_PPC_OF:
sig = NVRAM_SIG_OF;
part = &of_config_partition;
*type = PSTORE_TYPE_PPC_OF;
*id = PSTORE_TYPE_PPC_OF;
time->tv_sec = 0;
time->tv_nsec = 0;
break;
#endif
default:
return 0;
}
if (!part->os_partition) {
p = nvram_find_partition(part->name, sig, &size);
if (p <= 0) {
pr_err("nvram: Failed to find partition %s, "
"err %d\n", part->name, (int)p);
return 0;
}
part->index = p;
part->size = size;
}
buff = kmalloc(part->size, GFP_KERNEL);
if (!buff)
return -ENOMEM;
if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {
kfree(buff);
return 0;
}
*count = 0;
if (part->os_partition)
*id = id_no;
if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) {
size_t length, hdr_size;
oops_hdr = (struct oops_log_info *)buff;
if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {
/* Old format oops header had 2-byte record size */
hdr_size = sizeof(u16);
length = be16_to_cpu(oops_hdr->version);
time->tv_sec = 0;
time->tv_nsec = 0;
} else {
hdr_size = sizeof(*oops_hdr);
length = be16_to_cpu(oops_hdr->report_length);
time->tv_sec = be64_to_cpu(oops_hdr->timestamp);
time->tv_nsec = 0;
}
*buf = kmalloc(length, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, buff + hdr_size, length);
kfree(buff);
if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
*compressed = true;
else
*compressed = false;
return length;
}
*buf = buff;
return part->size;
}
static struct pstore_info nvram_pstore_info = {
.owner = THIS_MODULE,
.name = "nvram",
.open = nvram_pstore_open,
.read = nvram_pstore_read,
.write = nvram_pstore_write,
};
static int nvram_pstore_init(void)
{
int rc = 0;
nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS;
nvram_type_ids[3] = PSTORE_TYPE_PPC_OF;
nvram_pstore_info.buf = oops_data;
nvram_pstore_info.bufsize = oops_data_sz;
spin_lock_init(&nvram_pstore_info.buf_lock);
rc = pstore_register(&nvram_pstore_info);
if (rc != 0)
pr_err("nvram: pstore_register() failed, defaults to "
"kmsg_dump; returned %d\n", rc);
return rc;
}
#else
static int nvram_pstore_init(void)
{
return -1;
}
#endif
void __init nvram_init_oops_partition(int rtas_partition_exists)
{
int rc;
rc = nvram_init_os_partition(&oops_log_partition);
if (rc != 0) {
#ifdef CONFIG_PPC_PSERIES
if (!rtas_partition_exists) {
pr_err("nvram: Failed to initialize oops partition!");
return;
}
pr_notice("nvram: Using %s partition to log both"
" RTAS errors and oops/panic reports\n",
rtas_log_partition.name);
memcpy(&oops_log_partition, &rtas_log_partition,
sizeof(rtas_log_partition));
#else
pr_err("nvram: Failed to initialize oops partition!");
return;
#endif
}
oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL);
if (!oops_buf) {
pr_err("nvram: No memory for %s partition\n",
oops_log_partition.name);
return;
}
oops_data = oops_buf + sizeof(struct oops_log_info);
oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);
rc = nvram_pstore_init();
if (!rc)
return;
/*
* Figure compression (preceded by elimination of each line's <n>
* severity prefix) will reduce the oops/panic report to at most
* 45% of its original size.
*/
big_oops_buf_sz = (oops_data_sz * 100) / 45;
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
stream.workspace = kmalloc(zlib_deflate_workspacesize(
WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
if (!stream.workspace) {
pr_err("nvram: No memory for compression workspace; "
"skipping compression of %s partition data\n",
oops_log_partition.name);
kfree(big_oops_buf);
big_oops_buf = NULL;
}
} else {
pr_err("No memory for uncompressed %s data; "
"skipping compression\n", oops_log_partition.name);
stream.workspace = NULL;
}
rc = kmsg_dump_register(&nvram_kmsg_dumper);
if (rc != 0) {
pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
kfree(oops_buf);
kfree(big_oops_buf);
kfree(stream.workspace);
}
}
/*
* This is our kmsg_dump callback, called after an oops or panic report
* has been written to the printk buffer. We want to capture as much
* of the printk buffer as possible. First, capture as much as we can
* that we think will compress sufficiently to fit in the lnx,oops-log
* partition. If that's too much, go back and capture uncompressed text.
*/
static void oops_to_nvram(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
static unsigned int oops_count = 0;
static bool panicking = false;
static DEFINE_SPINLOCK(lock);
unsigned long flags;
size_t text_len;
unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
int rc = -1;
switch (reason) {
case KMSG_DUMP_RESTART:
case KMSG_DUMP_HALT:
case KMSG_DUMP_POWEROFF:
/* These are almost always orderly shutdowns. */
return;
case KMSG_DUMP_OOPS:
break;
case KMSG_DUMP_PANIC:
panicking = true;
break;
case KMSG_DUMP_EMERG:
if (panicking)
/* Panic report already captured. */
return;
break;
default:
pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
__func__, (int) reason);
return;
}
if (clobbering_unread_rtas_event())
return;
if (!spin_trylock_irqsave(&lock, flags))
return;
if (big_oops_buf) {
kmsg_dump_get_buffer(dumper, false,
big_oops_buf, big_oops_buf_sz, &text_len);
rc = zip_oops(text_len);
}
if (rc != 0) {
kmsg_dump_rewind(dumper);
kmsg_dump_get_buffer(dumper, false,
oops_data, oops_data_sz, &text_len);
err_type = ERR_TYPE_KERNEL_PANIC;
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
oops_hdr->report_length = cpu_to_be16(text_len);
oops_hdr->timestamp = cpu_to_be64(get_seconds());
}
(void) nvram_write_os_partition(&oops_log_partition, oops_buf,
(int) (sizeof(*oops_hdr) + text_len), err_type,
++oops_count);
spin_unlock_irqrestore(&lock, flags);
}
static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
{
int size;

1
arch/powerpc/platforms/Kconfig.cputype
View File

@ -2,6 +2,7 @@ config PPC64
bool "64-bit kernel"
default n
select HAVE_VIRT_CPU_ACCOUNTING
select ZLIB_DEFLATE
help
This option selects whether a 32-bit or a 64-bit kernel
will be built.

1
arch/powerpc/platforms/pseries/Kconfig
View File

@ -16,7 +16,6 @@ config PPC_PSERIES
select PPC_UDBG_16550
select PPC_NATIVE
select PPC_PCI_CHOICE if EXPERT
select ZLIB_DEFLATE
select PPC_DOORBELL
select HAVE_CONTEXT_TRACKING
select HOTPLUG_CPU if SMP

666
arch/powerpc/platforms/pseries/nvram.c
View File

@ -20,7 +20,6 @@
#include <linux/kmsg_dump.h>
#include <linux/pstore.h>
#include <linux/ctype.h>
#include <linux/zlib.h>
#include <asm/uaccess.h>
#include <asm/nvram.h>
#include <asm/rtas.h>
@ -30,129 +29,17 @@
/* Max bytes to read/write in one go */
#define NVRW_CNT 0x20
/*
* Set oops header version to distinguish between old and new format header.
* lnx,oops-log partition max size is 4000, header version > 4000 will
* help in identifying new header.
*/
#define OOPS_HDR_VERSION 5000
static unsigned int nvram_size;
static int nvram_fetch, nvram_store;
static char nvram_buf[NVRW_CNT]; /* assume this is in the first 4GB */
static DEFINE_SPINLOCK(nvram_lock);
struct err_log_info {
__be32 error_type;
__be32 seq_num;
};
struct nvram_os_partition {
const char *name;
int req_size; /* desired size, in bytes */
int min_size; /* minimum acceptable size (0 means req_size) */
long size; /* size of data portion (excluding err_log_info) */
long index; /* offset of data portion of partition */
bool os_partition; /* partition initialized by OS, not FW */
};
static struct nvram_os_partition rtas_log_partition = {
.name = "ibm,rtas-log",
.req_size = 2079,
.min_size = 1055,
.index = -1,
.os_partition = true
};
static struct nvram_os_partition oops_log_partition = {
.name = "lnx,oops-log",
.req_size = 4000,
.min_size = 2000,
.index = -1,
.os_partition = true
};
static const char *pseries_nvram_os_partitions[] = {
"ibm,rtas-log",
"lnx,oops-log",
NULL
};
struct oops_log_info {
__be16 version;
__be16 report_length;
__be64 timestamp;
} __attribute__((packed));
static void oops_to_nvram(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason);
static struct kmsg_dumper nvram_kmsg_dumper = {
.dump = oops_to_nvram
};
/* See clobbering_unread_rtas_event() */
#define NVRAM_RTAS_READ_TIMEOUT 5 /* seconds */
static unsigned long last_unread_rtas_event; /* timestamp */
/*
* For capturing and compressing an oops or panic report...
* big_oops_buf[] holds the uncompressed text we're capturing.
*
* oops_buf[] holds the compressed text, preceded by a oops header.
* oops header has u16 holding the version of oops header (to differentiate
* between old and new format header) followed by u16 holding the length of
* the compressed* text (*Or uncompressed, if compression fails.) and u64
* holding the timestamp. oops_buf[] gets written to NVRAM.
*
* oops_log_info points to the header. oops_data points to the compressed text.
*
* +- oops_buf
* | +- oops_data
* v v
* +-----------+-----------+-----------+------------------------+
* | version | length | timestamp | text |
* | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
* +-----------+-----------+-----------+------------------------+
* ^
* +- oops_log_info
*
* We preallocate these buffers during init to avoid kmalloc during oops/panic.
*/
static size_t big_oops_buf_sz;
static char *big_oops_buf, *oops_buf;
static char *oops_data;
static size_t oops_data_sz;
/* Compression parameters */
#define COMPR_LEVEL 6
#define WINDOW_BITS 12
#define MEM_LEVEL 4
static struct z_stream_s stream;
#ifdef CONFIG_PSTORE
static struct nvram_os_partition of_config_partition = {
.name = "of-config",
.index = -1,
.os_partition = false
};
static struct nvram_os_partition common_partition = {
.name = "common",
.index = -1,
.os_partition = false
};
static enum pstore_type_id nvram_type_ids[] = {
PSTORE_TYPE_DMESG,
PSTORE_TYPE_PPC_RTAS,
PSTORE_TYPE_PPC_OF,
PSTORE_TYPE_PPC_COMMON,
-1
};
static int read_type;
static unsigned long last_rtas_event;
unsigned long last_rtas_event;
#endif
static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
@ -246,73 +133,11 @@ static ssize_t pSeries_nvram_get_size(void)
return nvram_size ? nvram_size : -ENODEV;
}
/* nvram_write_os_partition, nvram_write_error_log
/* nvram_write_error_log
*
* We need to buffer the error logs into nvram to ensure that we have
* the failure information to decode. If we have a severe error there
* is no way to guarantee that the OS or the machine is in a state to
* get back to user land and write the error to disk. For example if
* the SCSI device driver causes a Machine Check by writing to a bad
* IO address, there is no way of guaranteeing that the device driver
* is in any state that is would also be able to write the error data
* captured to disk, thus we buffer it in NVRAM for analysis on the
* next boot.
*
* In NVRAM the partition containing the error log buffer will looks like:
* Header (in bytes):
* +-----------+----------+--------+------------+------------------+
* | signature | checksum | length | name | data |
* |0 |1 |2 3|4 15|16 length-1|
* +-----------+----------+--------+------------+------------------+
*
* The 'data' section would look like (in bytes):
* +--------------+------------+-----------------------------------+
* | event_logged | sequence # | error log |
* |0 3|4 7|8 error_log_size-1|
* +--------------+------------+-----------------------------------+
*
* event_logged: 0 if event has not been logged to syslog, 1 if it has
* sequence #: The unique sequence # for each event. (until it wraps)
* error log: The error log from event_scan
* the failure information to decode.
*/
static int nvram_write_os_partition(struct nvram_os_partition *part,
char *buff, int length,
unsigned int err_type,
unsigned int error_log_cnt)
{
int rc;
loff_t tmp_index;
struct err_log_info info;
if (part->index == -1) {
return -ESPIPE;
}
if (length > part->size) {
length = part->size;
}
info.error_type = cpu_to_be32(err_type);
info.seq_num = cpu_to_be32(error_log_cnt);
tmp_index = part->index;
rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
return rc;
}
rc = ppc_md.nvram_write(buff, length, &tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
return rc;
}
return 0;
}
int nvram_write_error_log(char * buff, int length,
unsigned int err_type, unsigned int error_log_cnt)
{
@ -328,50 +153,6 @@ int nvram_write_error_log(char * buff, int length,
return rc;
}
/* nvram_read_partition
*
* Reads nvram partition for at most 'length'
*/
static int nvram_read_partition(struct nvram_os_partition *part, char *buff,
int length, unsigned int *err_type,
unsigned int *error_log_cnt)
{
int rc;
loff_t tmp_index;
struct err_log_info info;
if (part->index == -1)
return -1;
if (length > part->size)
length = part->size;
tmp_index = part->index;
if (part->os_partition) {
rc = ppc_md.nvram_read((char *)&info,
sizeof(struct err_log_info),
&tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
return rc;
}
}
rc = ppc_md.nvram_read(buff, length, &tmp_index);
if (rc <= 0) {
pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
return rc;
}
if (part->os_partition) {
*error_log_cnt = be32_to_cpu(info.seq_num);
*err_type = be32_to_cpu(info.error_type);
}
return 0;
}
/* nvram_read_error_log
*
* Reads nvram for error log for at most 'length'
@ -407,67 +188,6 @@ int nvram_clear_error_log(void)
return 0;
}
/* pseries_nvram_init_os_partition
*
* This sets up a partition with an "OS" signature.
*
* The general strategy is the following:
* 1.) If a partition with the indicated name already exists...
* - If it's large enough, use it.
* - Otherwise, recycle it and keep going.
* 2.) Search for a free partition that is large enough.
* 3.) If there's not a free partition large enough, recycle any obsolete
* OS partitions and try again.
* 4.) Will first try getting a chunk that will satisfy the requested size.
* 5.) If a chunk of the requested size cannot be allocated, then try finding
* a chunk that will satisfy the minum needed.
*
* Returns 0 on success, else -1.
*/
static int __init pseries_nvram_init_os_partition(struct nvram_os_partition
*part)
{
loff_t p;
int size;
/* Look for ours */
p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
/* Found one but too small, remove it */
if (p && size < part->min_size) {
pr_info("nvram: Found too small %s partition,"
" removing it...\n", part->name);
nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
p = 0;
}
/* Create one if we didn't find */
if (!p) {
p = nvram_create_partition(part->name, NVRAM_SIG_OS,
part->req_size, part->min_size);
if (p == -ENOSPC) {
pr_info("nvram: No room to create %s partition, "
"deleting any obsolete OS partitions...\n",
part->name);
nvram_remove_partition(NULL, NVRAM_SIG_OS,
pseries_nvram_os_partitions);
p = nvram_create_partition(part->name, NVRAM_SIG_OS,
part->req_size, part->min_size);
}
}
if (p <= 0) {
pr_err("nvram: Failed to find or create %s"
" partition, err %d\n", part->name, (int)p);
return -1;
}
part->index = p;
part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
return 0;
}
/*
* Are we using the ibm,rtas-log for oops/panic reports? And if so,
* would logging this oops/panic overwrite an RTAS event that rtas_errd
@ -476,7 +196,7 @@ static int __init pseries_nvram_init_os_partition(struct nvram_os_partition
* We assume that if rtas_errd hasn't read the RTAS event in
* NVRAM_RTAS_READ_TIMEOUT seconds, it's probably not going to.
*/
static int clobbering_unread_rtas_event(void)
int clobbering_unread_rtas_event(void)
{
return (oops_log_partition.index == rtas_log_partition.index
&& last_unread_rtas_event
@ -484,313 +204,6 @@ static int clobbering_unread_rtas_event(void)
NVRAM_RTAS_READ_TIMEOUT);
}
/* Derived from logfs_compress() */
static int nvram_compress(const void *in, void *out, size_t inlen,
size_t outlen)
{
int err, ret;
ret = -EIO;
err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
MEM_LEVEL, Z_DEFAULT_STRATEGY);
if (err != Z_OK)
goto error;
stream.next_in = in;
stream.avail_in = inlen;
stream.total_in = 0;
stream.next_out = out;
stream.avail_out = outlen;
stream.total_out = 0;
err = zlib_deflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto error;
err = zlib_deflateEnd(&stream);
if (err != Z_OK)
goto error;
if (stream.total_out >= stream.total_in)
goto error;
ret = stream.total_out;
error:
return ret;
}
/* Compress the text from big_oops_buf into oops_buf. */
static int zip_oops(size_t text_len)
{
struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
oops_data_sz);
if (zipped_len < 0) {
pr_err("nvram: compression failed; returned %d\n", zipped_len);
pr_err("nvram: logging uncompressed oops/panic report\n");
return -1;
}
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
oops_hdr->report_length = cpu_to_be16(zipped_len);
oops_hdr->timestamp = cpu_to_be64(get_seconds());
return 0;
}
#ifdef CONFIG_PSTORE
static int nvram_pstore_open(struct pstore_info *psi)
{
/* Reset the iterator to start reading partitions again */
read_type = -1;
return 0;
}
/**
* nvram_pstore_write - pstore write callback for nvram
* @type: Type of message logged
* @reason: reason behind dump (oops/panic)
* @id: identifier to indicate the write performed
* @part: pstore writes data to registered buffer in parts,
* part number will indicate the same.
* @count: Indicates oops count
* @compressed: Flag to indicate the log is compressed
* @size: number of bytes written to the registered buffer
* @psi: registered pstore_info structure
*
* Called by pstore_dump() when an oops or panic report is logged in the
* printk buffer.
* Returns 0 on successful write.
*/
static int nvram_pstore_write(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part, int count,
bool compressed, size_t size,
struct pstore_info *psi)
{
int rc;
unsigned int err_type = ERR_TYPE_KERNEL_PANIC;
struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;
/* part 1 has the recent messages from printk buffer */
if (part > 1 || type != PSTORE_TYPE_DMESG ||
clobbering_unread_rtas_event())
return -1;
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
oops_hdr->report_length = cpu_to_be16(size);
oops_hdr->timestamp = cpu_to_be64(get_seconds());
if (compressed)
err_type = ERR_TYPE_KERNEL_PANIC_GZ;
rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
(int) (sizeof(*oops_hdr) + size), err_type, count);
if (rc != 0)
return rc;
*id = part;
return 0;
}
/*
* Reads the oops/panic report, rtas, of-config and common partition.
* Returns the length of the data we read from each partition.
* Returns 0 if we've been called before.
*/
static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time, char **buf,
bool *compressed, struct pstore_info *psi)
{
struct oops_log_info *oops_hdr;
unsigned int err_type, id_no, size = 0;
struct nvram_os_partition *part = NULL;
char *buff = NULL;
int sig = 0;
loff_t p;
read_type++;
switch (nvram_type_ids[read_type]) {
case PSTORE_TYPE_DMESG:
part = &oops_log_partition;
*type = PSTORE_TYPE_DMESG;
break;
case PSTORE_TYPE_PPC_RTAS:
part = &rtas_log_partition;
*type = PSTORE_TYPE_PPC_RTAS;
time->tv_sec = last_rtas_event;
time->tv_nsec = 0;
break;
case PSTORE_TYPE_PPC_OF:
sig = NVRAM_SIG_OF;
part = &of_config_partition;
*type = PSTORE_TYPE_PPC_OF;
*id = PSTORE_TYPE_PPC_OF;
time->tv_sec = 0;
time->tv_nsec = 0;
break;
case PSTORE_TYPE_PPC_COMMON:
sig = NVRAM_SIG_SYS;
part = &common_partition;
*type = PSTORE_TYPE_PPC_COMMON;
*id = PSTORE_TYPE_PPC_COMMON;
time->tv_sec = 0;
time->tv_nsec = 0;
break;
default:
return 0;
}
if (!part->os_partition) {
p = nvram_find_partition(part->name, sig, &size);
if (p <= 0) {
pr_err("nvram: Failed to find partition %s, "
"err %d\n", part->name, (int)p);
return 0;
}
part->index = p;
part->size = size;
}
buff = kmalloc(part->size, GFP_KERNEL);
if (!buff)
return -ENOMEM;
if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {
kfree(buff);
return 0;
}
*count = 0;
if (part->os_partition)
*id = id_no;
if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) {
size_t length, hdr_size;
oops_hdr = (struct oops_log_info *)buff;
if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {
/* Old format oops header had 2-byte record size */
hdr_size = sizeof(u16);
length = be16_to_cpu(oops_hdr->version);
time->tv_sec = 0;
time->tv_nsec = 0;
} else {
hdr_size = sizeof(*oops_hdr);
length = be16_to_cpu(oops_hdr->report_length);
time->tv_sec = be64_to_cpu(oops_hdr->timestamp);
time->tv_nsec = 0;
}
*buf = kmalloc(length, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, buff + hdr_size, length);
kfree(buff);
if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
*compressed = true;
else
*compressed = false;
return length;
}
*buf = buff;
return part->size;
}
static struct pstore_info nvram_pstore_info = {
.owner = THIS_MODULE,
.name = "nvram",
.open = nvram_pstore_open,
.read = nvram_pstore_read,
.write = nvram_pstore_write,
};
static int nvram_pstore_init(void)
{
int rc = 0;
nvram_pstore_info.buf = oops_data;
nvram_pstore_info.bufsize = oops_data_sz;
spin_lock_init(&nvram_pstore_info.buf_lock);
rc = pstore_register(&nvram_pstore_info);
if (rc != 0)
pr_err("nvram: pstore_register() failed, defaults to "
"kmsg_dump; returned %d\n", rc);
return rc;
}
#else
static int nvram_pstore_init(void)
{
return -1;
}
#endif
static void __init nvram_init_oops_partition(int rtas_partition_exists)
{
int rc;
rc = pseries_nvram_init_os_partition(&oops_log_partition);
if (rc != 0) {
if (!rtas_partition_exists)
return;
pr_notice("nvram: Using %s partition to log both"
" RTAS errors and oops/panic reports\n",
rtas_log_partition.name);
memcpy(&oops_log_partition, &rtas_log_partition,
sizeof(rtas_log_partition));
}
oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL);
if (!oops_buf) {
pr_err("nvram: No memory for %s partition\n",
oops_log_partition.name);
return;
}
oops_data = oops_buf + sizeof(struct oops_log_info);
oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);
rc = nvram_pstore_init();
if (!rc)
return;
/*
* Figure compression (preceded by elimination of each line's <n>
* severity prefix) will reduce the oops/panic report to at most
* 45% of its original size.
*/
big_oops_buf_sz = (oops_data_sz * 100) / 45;
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
stream.workspace = kmalloc(zlib_deflate_workspacesize(
WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
if (!stream.workspace) {
pr_err("nvram: No memory for compression workspace; "
"skipping compression of %s partition data\n",
oops_log_partition.name);
kfree(big_oops_buf);
big_oops_buf = NULL;
}
} else {
pr_err("No memory for uncompressed %s data; "
"skipping compression\n", oops_log_partition.name);
stream.workspace = NULL;
}
rc = kmsg_dump_register(&nvram_kmsg_dumper);
if (rc != 0) {
pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
kfree(oops_buf);
kfree(big_oops_buf);
kfree(stream.workspace);
}
}
static int __init pseries_nvram_init_log_partitions(void)
{
int rc;
@ -798,7 +211,7 @@ static int __init pseries_nvram_init_log_partitions(void)
/* Scan nvram for partitions */
nvram_scan_partitions();
rc = pseries_nvram_init_os_partition(&rtas_log_partition);
rc = nvram_init_os_partition(&rtas_log_partition);
nvram_init_oops_partition(rc == 0);
return 0;
}
@ -834,72 +247,3 @@ int __init pSeries_nvram_init(void)
return 0;
}
/*
* This is our kmsg_dump callback, called after an oops or panic report
* has been written to the printk buffer. We want to capture as much
* of the printk buffer as possible. First, capture as much as we can
* that we think will compress sufficiently to fit in the lnx,oops-log
* partition. If that's too much, go back and capture uncompressed text.
*/
static void oops_to_nvram(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
static unsigned int oops_count = 0;
static bool panicking = false;
static DEFINE_SPINLOCK(lock);
unsigned long flags;
size_t text_len;
unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
int rc = -1;
switch (reason) {
case KMSG_DUMP_RESTART:
case KMSG_DUMP_HALT:
case KMSG_DUMP_POWEROFF:
/* These are almost always orderly shutdowns. */
return;
case KMSG_DUMP_OOPS:
break;
case KMSG_DUMP_PANIC:
panicking = true;
break;
case KMSG_DUMP_EMERG:
if (panicking)
/* Panic report already captured. */
return;
break;
default:
pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
__func__, (int) reason);
return;
}
if (clobbering_unread_rtas_event())
return;
if (!spin_trylock_irqsave(&lock, flags))
return;
if (big_oops_buf) {
kmsg_dump_get_buffer(dumper, false,
big_oops_buf, big_oops_buf_sz, &text_len);
rc = zip_oops(text_len);
}
if (rc != 0) {
kmsg_dump_rewind(dumper);
kmsg_dump_get_buffer(dumper, false,
oops_data, oops_data_sz, &text_len);
err_type = ERR_TYPE_KERNEL_PANIC;
oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
oops_hdr->report_length = cpu_to_be16(text_len);
oops_hdr->timestamp = cpu_to_be64(get_seconds());
}
(void) nvram_write_os_partition(&oops_log_partition, oops_buf,
(int) (sizeof(*oops_hdr) + text_len), err_type,
++oops_count);
spin_unlock_irqrestore(&lock, flags);
}