mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1055 lines
28 KiB
1055 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* c 2001 PPC 64 Team, IBM Corp |
|
* |
|
* /dev/nvram driver for PPC64 |
|
*/ |
|
|
|
#include <linux/types.h> |
|
#include <linux/errno.h> |
|
#include <linux/fs.h> |
|
#include <linux/miscdevice.h> |
|
#include <linux/fcntl.h> |
|
#include <linux/nvram.h> |
|
#include <linux/init.h> |
|
#include <linux/slab.h> |
|
#include <linux/spinlock.h> |
|
#include <linux/kmsg_dump.h> |
|
#include <linux/pagemap.h> |
|
#include <linux/pstore.h> |
|
#include <linux/zlib.h> |
|
#include <linux/uaccess.h> |
|
#include <asm/nvram.h> |
|
#include <asm/rtas.h> |
|
#include <asm/prom.h> |
|
#include <asm/machdep.h> |
|
|
|
#undef DEBUG_NVRAM |
|
|
|
#define NVRAM_HEADER_LEN sizeof(struct nvram_header) |
|
#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN |
|
|
|
/* If change this size, then change the size of NVNAME_LEN */ |
|
struct nvram_header { |
|
unsigned char signature; |
|
unsigned char checksum; |
|
unsigned short length; |
|
/* Terminating null required only for names < 12 chars. */ |
|
char name[12]; |
|
}; |
|
|
|
struct nvram_partition { |
|
struct list_head partition; |
|
struct nvram_header header; |
|
unsigned int index; |
|
}; |
|
|
|
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_POWERNV |
|
static struct nvram_os_partition skiboot_partition = { |
|
.name = "ibm,skiboot", |
|
.index = -1, |
|
.os_partition = false |
|
}; |
|
#endif |
|
|
|
#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(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(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(ktime_get_real_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 |
|
* @record: pstore record to write, with @id to be set |
|
* |
|
* 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(struct pstore_record *record) |
|
{ |
|
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 (record->part > 1 || (record->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(record->size); |
|
oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds()); |
|
|
|
if (record->compressed) |
|
err_type = ERR_TYPE_KERNEL_PANIC_GZ; |
|
|
|
rc = nvram_write_os_partition(&oops_log_partition, oops_buf, |
|
(int) (sizeof(*oops_hdr) + record->size), err_type, |
|
record->count); |
|
|
|
if (rc != 0) |
|
return rc; |
|
|
|
record->id = record->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(struct pstore_record *record) |
|
{ |
|
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; |
|
record->type = PSTORE_TYPE_DMESG; |
|
break; |
|
case PSTORE_TYPE_PPC_COMMON: |
|
sig = NVRAM_SIG_SYS; |
|
part = &common_partition; |
|
record->type = PSTORE_TYPE_PPC_COMMON; |
|
record->id = PSTORE_TYPE_PPC_COMMON; |
|
record->time.tv_sec = 0; |
|
record->time.tv_nsec = 0; |
|
break; |
|
#ifdef CONFIG_PPC_PSERIES |
|
case PSTORE_TYPE_PPC_RTAS: |
|
part = &rtas_log_partition; |
|
record->type = PSTORE_TYPE_PPC_RTAS; |
|
record->time.tv_sec = last_rtas_event; |
|
record->time.tv_nsec = 0; |
|
break; |
|
case PSTORE_TYPE_PPC_OF: |
|
sig = NVRAM_SIG_OF; |
|
part = &of_config_partition; |
|
record->type = PSTORE_TYPE_PPC_OF; |
|
record->id = PSTORE_TYPE_PPC_OF; |
|
record->time.tv_sec = 0; |
|
record->time.tv_nsec = 0; |
|
break; |
|
#endif |
|
#ifdef CONFIG_PPC_POWERNV |
|
case PSTORE_TYPE_PPC_OPAL: |
|
sig = NVRAM_SIG_FW; |
|
part = &skiboot_partition; |
|
record->type = PSTORE_TYPE_PPC_OPAL; |
|
record->id = PSTORE_TYPE_PPC_OPAL; |
|
record->time.tv_sec = 0; |
|
record->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; |
|
} |
|
|
|
record->count = 0; |
|
|
|
if (part->os_partition) |
|
record->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); |
|
record->time.tv_sec = 0; |
|
record->time.tv_nsec = 0; |
|
} else { |
|
hdr_size = sizeof(*oops_hdr); |
|
length = be16_to_cpu(oops_hdr->report_length); |
|
record->time.tv_sec = be64_to_cpu(oops_hdr->timestamp); |
|
record->time.tv_nsec = 0; |
|
} |
|
record->buf = kmemdup(buff + hdr_size, length, GFP_KERNEL); |
|
kfree(buff); |
|
if (record->buf == NULL) |
|
return -ENOMEM; |
|
|
|
record->ecc_notice_size = 0; |
|
if (err_type == ERR_TYPE_KERNEL_PANIC_GZ) |
|
record->compressed = true; |
|
else |
|
record->compressed = false; |
|
return length; |
|
} |
|
|
|
record->buf = buff; |
|
return part->size; |
|
} |
|
|
|
static struct pstore_info nvram_pstore_info = { |
|
.owner = THIS_MODULE, |
|
.name = "nvram", |
|
.flags = PSTORE_FLAGS_DMESG, |
|
.open = nvram_pstore_open, |
|
.read = nvram_pstore_read, |
|
.write = nvram_pstore_write, |
|
}; |
|
|
|
static int nvram_pstore_init(void) |
|
{ |
|
int rc = 0; |
|
|
|
if (machine_is(pseries)) { |
|
nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS; |
|
nvram_type_ids[3] = PSTORE_TYPE_PPC_OF; |
|
} else |
|
nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL; |
|
|
|
nvram_pstore_info.buf = oops_data; |
|
nvram_pstore_info.bufsize = oops_data_sz; |
|
|
|
rc = pstore_register(&nvram_pstore_info); |
|
if (rc && (rc != -EPERM)) |
|
/* Print error only when pstore.backend == nvram */ |
|
pr_err("nvram: pstore_register() failed, returned %d. " |
|
"Defaults to kmsg_dump\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 struct kmsg_dump_iter iter; |
|
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_SHUTDOWN: |
|
/* 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_rewind(&iter); |
|
kmsg_dump_get_buffer(&iter, false, |
|
big_oops_buf, big_oops_buf_sz, &text_len); |
|
rc = zip_oops(text_len); |
|
} |
|
if (rc != 0) { |
|
kmsg_dump_rewind(&iter); |
|
kmsg_dump_get_buffer(&iter, 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(ktime_get_real_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); |
|
} |
|
|
|
#ifdef DEBUG_NVRAM |
|
static void __init nvram_print_partitions(char * label) |
|
{ |
|
struct nvram_partition * tmp_part; |
|
|
|
printk(KERN_WARNING "--------%s---------\n", label); |
|
printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); |
|
list_for_each_entry(tmp_part, &nvram_partitions, partition) { |
|
printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12.12s\n", |
|
tmp_part->index, tmp_part->header.signature, |
|
tmp_part->header.checksum, tmp_part->header.length, |
|
tmp_part->header.name); |
|
} |
|
} |
|
#endif |
|
|
|
|
|
static int __init nvram_write_header(struct nvram_partition * part) |
|
{ |
|
loff_t tmp_index; |
|
int rc; |
|
struct nvram_header phead; |
|
|
|
memcpy(&phead, &part->header, NVRAM_HEADER_LEN); |
|
phead.length = cpu_to_be16(phead.length); |
|
|
|
tmp_index = part->index; |
|
rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index); |
|
|
|
return rc; |
|
} |
|
|
|
|
|
static unsigned char __init nvram_checksum(struct nvram_header *p) |
|
{ |
|
unsigned int c_sum, c_sum2; |
|
unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ |
|
c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; |
|
|
|
/* The sum may have spilled into the 3rd byte. Fold it back. */ |
|
c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; |
|
/* The sum cannot exceed 2 bytes. Fold it into a checksum */ |
|
c_sum2 = (c_sum >> 8) + (c_sum << 8); |
|
c_sum = ((c_sum + c_sum2) >> 8) & 0xff; |
|
return c_sum; |
|
} |
|
|
|
/* |
|
* Per the criteria passed via nvram_remove_partition(), should this |
|
* partition be removed? 1=remove, 0=keep |
|
*/ |
|
static int nvram_can_remove_partition(struct nvram_partition *part, |
|
const char *name, int sig, const char *exceptions[]) |
|
{ |
|
if (part->header.signature != sig) |
|
return 0; |
|
if (name) { |
|
if (strncmp(name, part->header.name, 12)) |
|
return 0; |
|
} else if (exceptions) { |
|
const char **except; |
|
for (except = exceptions; *except; except++) { |
|
if (!strncmp(*except, part->header.name, 12)) |
|
return 0; |
|
} |
|
} |
|
return 1; |
|
} |
|
|
|
/** |
|
* nvram_remove_partition - Remove one or more partitions in nvram |
|
* @name: name of the partition to remove, or NULL for a |
|
* signature only match |
|
* @sig: signature of the partition(s) to remove |
|
* @exceptions: When removing all partitions with a matching signature, |
|
* leave these alone. |
|
*/ |
|
|
|
int __init nvram_remove_partition(const char *name, int sig, |
|
const char *exceptions[]) |
|
{ |
|
struct nvram_partition *part, *prev, *tmp; |
|
int rc; |
|
|
|
list_for_each_entry(part, &nvram_partitions, partition) { |
|
if (!nvram_can_remove_partition(part, name, sig, exceptions)) |
|
continue; |
|
|
|
/* Make partition a free partition */ |
|
part->header.signature = NVRAM_SIG_FREE; |
|
memset(part->header.name, 'w', 12); |
|
part->header.checksum = nvram_checksum(&part->header); |
|
rc = nvram_write_header(part); |
|
if (rc <= 0) { |
|
printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
|
return rc; |
|
} |
|
} |
|
|
|
/* Merge contiguous ones */ |
|
prev = NULL; |
|
list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { |
|
if (part->header.signature != NVRAM_SIG_FREE) { |
|
prev = NULL; |
|
continue; |
|
} |
|
if (prev) { |
|
prev->header.length += part->header.length; |
|
prev->header.checksum = nvram_checksum(&prev->header); |
|
rc = nvram_write_header(prev); |
|
if (rc <= 0) { |
|
printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
|
return rc; |
|
} |
|
list_del(&part->partition); |
|
kfree(part); |
|
} else |
|
prev = part; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* nvram_create_partition - Create a partition in nvram |
|
* @name: name of the partition to create |
|
* @sig: signature of the partition to create |
|
* @req_size: size of data to allocate in bytes |
|
* @min_size: minimum acceptable size (0 means req_size) |
|
* |
|
* Returns a negative error code or a positive nvram index |
|
* of the beginning of the data area of the newly created |
|
* partition. If you provided a min_size smaller than req_size |
|
* you need to query for the actual size yourself after the |
|
* call using nvram_partition_get_size(). |
|
*/ |
|
loff_t __init nvram_create_partition(const char *name, int sig, |
|
int req_size, int min_size) |
|
{ |
|
struct nvram_partition *part; |
|
struct nvram_partition *new_part; |
|
struct nvram_partition *free_part = NULL; |
|
static char nv_init_vals[16]; |
|
loff_t tmp_index; |
|
long size = 0; |
|
int rc; |
|
|
|
BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); |
|
|
|
/* Convert sizes from bytes to blocks */ |
|
req_size = ALIGN(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; |
|
min_size = ALIGN(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; |
|
|
|
/* If no minimum size specified, make it the same as the |
|
* requested size |
|
*/ |
|
if (min_size == 0) |
|
min_size = req_size; |
|
if (min_size > req_size) |
|
return -EINVAL; |
|
|
|
/* Now add one block to each for the header */ |
|
req_size += 1; |
|
min_size += 1; |
|
|
|
/* Find a free partition that will give us the maximum needed size |
|
If can't find one that will give us the minimum size needed */ |
|
list_for_each_entry(part, &nvram_partitions, partition) { |
|
if (part->header.signature != NVRAM_SIG_FREE) |
|
continue; |
|
|
|
if (part->header.length >= req_size) { |
|
size = req_size; |
|
free_part = part; |
|
break; |
|
} |
|
if (part->header.length > size && |
|
part->header.length >= min_size) { |
|
size = part->header.length; |
|
free_part = part; |
|
} |
|
} |
|
if (!size) |
|
return -ENOSPC; |
|
|
|
/* Create our OS partition */ |
|
new_part = kzalloc(sizeof(*new_part), GFP_KERNEL); |
|
if (!new_part) { |
|
pr_err("%s: kmalloc failed\n", __func__); |
|
return -ENOMEM; |
|
} |
|
|
|
new_part->index = free_part->index; |
|
new_part->header.signature = sig; |
|
new_part->header.length = size; |
|
memcpy(new_part->header.name, name, strnlen(name, sizeof(new_part->header.name))); |
|
new_part->header.checksum = nvram_checksum(&new_part->header); |
|
|
|
rc = nvram_write_header(new_part); |
|
if (rc <= 0) { |
|
pr_err("%s: nvram_write_header failed (%d)\n", __func__, rc); |
|
kfree(new_part); |
|
return rc; |
|
} |
|
list_add_tail(&new_part->partition, &free_part->partition); |
|
|
|
/* Adjust or remove the partition we stole the space from */ |
|
if (free_part->header.length > size) { |
|
free_part->index += size * NVRAM_BLOCK_LEN; |
|
free_part->header.length -= size; |
|
free_part->header.checksum = nvram_checksum(&free_part->header); |
|
rc = nvram_write_header(free_part); |
|
if (rc <= 0) { |
|
pr_err("%s: nvram_write_header failed (%d)\n", |
|
__func__, rc); |
|
return rc; |
|
} |
|
} else { |
|
list_del(&free_part->partition); |
|
kfree(free_part); |
|
} |
|
|
|
/* Clear the new partition */ |
|
for (tmp_index = new_part->index + NVRAM_HEADER_LEN; |
|
tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); |
|
tmp_index += NVRAM_BLOCK_LEN) { |
|
rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); |
|
if (rc <= 0) { |
|
pr_err("%s: nvram_write failed (%d)\n", |
|
__func__, rc); |
|
return rc; |
|
} |
|
} |
|
|
|
return new_part->index + NVRAM_HEADER_LEN; |
|
} |
|
|
|
/** |
|
* nvram_get_partition_size - Get the data size of an nvram partition |
|
* @data_index: This is the offset of the start of the data of |
|
* the partition. The same value that is returned by |
|
* nvram_create_partition(). |
|
*/ |
|
int nvram_get_partition_size(loff_t data_index) |
|
{ |
|
struct nvram_partition *part; |
|
|
|
list_for_each_entry(part, &nvram_partitions, partition) { |
|
if (part->index + NVRAM_HEADER_LEN == data_index) |
|
return (part->header.length - 1) * NVRAM_BLOCK_LEN; |
|
} |
|
return -1; |
|
} |
|
|
|
|
|
/** |
|
* nvram_find_partition - Find an nvram partition by signature and name |
|
* @name: Name of the partition or NULL for any name |
|
* @sig: Signature to test against |
|
* @out_size: if non-NULL, returns the size of the data part of the partition |
|
*/ |
|
loff_t nvram_find_partition(const char *name, int sig, int *out_size) |
|
{ |
|
struct nvram_partition *p; |
|
|
|
list_for_each_entry(p, &nvram_partitions, partition) { |
|
if (p->header.signature == sig && |
|
(!name || !strncmp(p->header.name, name, 12))) { |
|
if (out_size) |
|
*out_size = (p->header.length - 1) * |
|
NVRAM_BLOCK_LEN; |
|
return p->index + NVRAM_HEADER_LEN; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
int __init nvram_scan_partitions(void) |
|
{ |
|
loff_t cur_index = 0; |
|
struct nvram_header phead; |
|
struct nvram_partition * tmp_part; |
|
unsigned char c_sum; |
|
char * header; |
|
int total_size; |
|
int err; |
|
|
|
if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
|
return -ENODEV; |
|
total_size = ppc_md.nvram_size(); |
|
|
|
header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); |
|
if (!header) { |
|
printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
while (cur_index < total_size) { |
|
|
|
err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); |
|
if (err != NVRAM_HEADER_LEN) { |
|
printk(KERN_ERR "nvram_scan_partitions: Error parsing " |
|
"nvram partitions\n"); |
|
goto out; |
|
} |
|
|
|
cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ |
|
|
|
memcpy(&phead, header, NVRAM_HEADER_LEN); |
|
|
|
phead.length = be16_to_cpu(phead.length); |
|
|
|
err = 0; |
|
c_sum = nvram_checksum(&phead); |
|
if (c_sum != phead.checksum) { |
|
printk(KERN_WARNING "WARNING: nvram partition checksum" |
|
" was %02x, should be %02x!\n", |
|
phead.checksum, c_sum); |
|
printk(KERN_WARNING "Terminating nvram partition scan\n"); |
|
goto out; |
|
} |
|
if (!phead.length) { |
|
printk(KERN_WARNING "WARNING: nvram corruption " |
|
"detected: 0-length partition\n"); |
|
goto out; |
|
} |
|
tmp_part = kmalloc(sizeof(*tmp_part), GFP_KERNEL); |
|
err = -ENOMEM; |
|
if (!tmp_part) { |
|
printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); |
|
goto out; |
|
} |
|
|
|
memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); |
|
tmp_part->index = cur_index; |
|
list_add_tail(&tmp_part->partition, &nvram_partitions); |
|
|
|
cur_index += phead.length * NVRAM_BLOCK_LEN; |
|
} |
|
err = 0; |
|
|
|
#ifdef DEBUG_NVRAM |
|
nvram_print_partitions("NVRAM Partitions"); |
|
#endif |
|
|
|
out: |
|
kfree(header); |
|
return err; |
|
}
|
|
|