/*
* The printk log buffer consists of a sequenced collection of records, each
- * containing variable length message and dictionary text. Every record
- * also contains its own meta-data (@info).
+ * containing variable length message text. Every record also contains its
+ * own meta-data (@info).
*
* Every record meta-data carries the timestamp in microseconds, as well as
* the standard userspace syslog level and syslog facility. The usual kernel
* terminated.
*
* Optionally, a record can carry a dictionary of properties (key/value
- * pairs), to provide userspace with a machine-readable message context. The
- * length of the dictionary is available in @dict_len. The dictionary is not
- * terminated.
+ * pairs), to provide userspace with a machine-readable message context.
*
* Examples for well-defined, commonly used property names are:
* DEVICE=b12:8 device identifier
* +sound:card0 subsystem:devname
* SUBSYSTEM=pci driver-core subsystem name
*
- * Valid characters in property names are [a-zA-Z0-9.-_]. The plain text value
- * follows directly after a '=' character. Every property is terminated by
- * a '\0' character. The last property is not terminated.
+ * Valid characters in property names are [a-zA-Z0-9.-_]. Property names
+ * and values are terminated by a '\0' character.
*
* Example of record values:
- * record.text_buf = "it's a line" (unterminated)
- * record.dict_buf = "DEVICE=b8:2\0DRIVER=bug" (unterminated)
- * record.info.seq = 56
- * record.info.ts_nsec = 36863
- * record.info.text_len = 11
- * record.info.dict_len = 22
- * record.info.facility = 0 (LOG_KERN)
- * record.info.flags = 0
- * record.info.level = 3 (LOG_ERR)
- * record.info.caller_id = 299 (task 299)
+ * record.text_buf = "it's a line" (unterminated)
+ * record.info.seq = 56
+ * record.info.ts_nsec = 36863
+ * record.info.text_len = 11
+ * record.info.facility = 0 (LOG_KERN)
+ * record.info.flags = 0
+ * record.info.level = 3 (LOG_ERR)
+ * record.info.caller_id = 299 (task 299)
+ * record.info.dev_info.subsystem = "pci" (terminated)
+ * record.info.dev_info.device = "+pci:0000:00:01.0" (terminated)
*
* The 'struct printk_info' buffer must never be directly exported to
* userspace, it is a kernel-private implementation detail that might
* Define the average message size. This only affects the number of
* descriptors that will be available. Underestimating is better than
* overestimating (too many available descriptors is better than not enough).
- * The dictionary buffer will be the same size as the text buffer.
*/
#define PRB_AVGBITS 5 /* 32 character average length */
#error CONFIG_LOG_BUF_SHIFT value too small.
#endif
_DEFINE_PRINTKRB(printk_rb_static, CONFIG_LOG_BUF_SHIFT - PRB_AVGBITS,
- PRB_AVGBITS, PRB_AVGBITS, &__log_buf[0]);
+ PRB_AVGBITS, &__log_buf[0]);
static struct printk_ringbuffer printk_rb_dynamic;
/* insert record into the buffer, discard old ones, update heads */
static int log_store(u32 caller_id, int facility, int level,
enum log_flags flags, u64 ts_nsec,
- const char *dict, u16 dict_len,
+ const struct dev_printk_info *dev_info,
const char *text, u16 text_len)
{
struct prb_reserved_entry e;
struct printk_record r;
u16 trunc_msg_len = 0;
- prb_rec_init_wr(&r, text_len, dict_len);
+ prb_rec_init_wr(&r, text_len);
if (!prb_reserve(&e, prb, &r)) {
/* truncate the message if it is too long for empty buffer */
truncate_msg(&text_len, &trunc_msg_len);
- prb_rec_init_wr(&r, text_len + trunc_msg_len, dict_len);
+ prb_rec_init_wr(&r, text_len + trunc_msg_len);
/* survive when the log buffer is too small for trunc_msg */
if (!prb_reserve(&e, prb, &r))
return 0;
if (trunc_msg_len)
memcpy(&r.text_buf[text_len], trunc_msg, trunc_msg_len);
r.info->text_len = text_len + trunc_msg_len;
- if (r.dict_buf) {
- memcpy(&r.dict_buf[0], dict, dict_len);
- r.info->dict_len = dict_len;
- }
r.info->facility = facility;
r.info->level = level & 7;
r.info->flags = flags & 0x1f;
else
r.info->ts_nsec = local_clock();
r.info->caller_id = caller_id;
+ if (dev_info)
+ memcpy(&r.info->dev_info, dev_info, sizeof(r.info->dev_info));
/* insert message */
if ((flags & LOG_CONT) || !(flags & LOG_NEWLINE))
ts_usec, info->flags & LOG_CONT ? 'c' : '-', caller);
}
-static ssize_t msg_print_ext_body(char *buf, size_t size,
- char *dict, size_t dict_len,
- char *text, size_t text_len)
+static ssize_t msg_add_ext_text(char *buf, size_t size,
+ const char *text, size_t text_len,
+ unsigned char endc)
{
char *p = buf, *e = buf + size;
size_t i;
else
append_char(&p, e, c);
}
- append_char(&p, e, '\n');
+ append_char(&p, e, endc);
- if (dict_len) {
- bool line = true;
+ return p - buf;
+}
- for (i = 0; i < dict_len; i++) {
- unsigned char c = dict[i];
+static ssize_t msg_add_dict_text(char *buf, size_t size,
+ const char *key, const char *val)
+{
+ size_t val_len = strlen(val);
+ ssize_t len;
- if (line) {
- append_char(&p, e, ' ');
- line = false;
- }
+ if (!val_len)
+ return 0;
- if (c == '\0') {
- append_char(&p, e, '\n');
- line = true;
- continue;
- }
+ len = msg_add_ext_text(buf, size, "", 0, ' '); /* dict prefix */
+ len += msg_add_ext_text(buf + len, size - len, key, strlen(key), '=');
+ len += msg_add_ext_text(buf + len, size - len, val, val_len, '\n');
- if (c < ' ' || c >= 127 || c == '\\') {
- p += scnprintf(p, e - p, "\\x%02x", c);
- continue;
- }
+ return len;
+}
- append_char(&p, e, c);
- }
- append_char(&p, e, '\n');
- }
+static ssize_t msg_print_ext_body(char *buf, size_t size,
+ char *text, size_t text_len,
+ struct dev_printk_info *dev_info)
+{
+ ssize_t len;
- return p - buf;
+ len = msg_add_ext_text(buf, size, text, text_len, '\n');
+
+ if (!dev_info)
+ goto out;
+
+ len += msg_add_dict_text(buf + len, size - len, "SUBSYSTEM",
+ dev_info->subsystem);
+ len += msg_add_dict_text(buf + len, size - len, "DEVICE",
+ dev_info->device);
+out:
+ return len;
}
/* /dev/kmsg - userspace message inject/listen interface */
struct printk_info info;
char text_buf[CONSOLE_EXT_LOG_MAX];
- char dict_buf[CONSOLE_EXT_LOG_MAX];
struct printk_record record;
};
int r;
va_start(args, fmt);
- r = vprintk_emit(facility, level, NULL, 0, fmt, args);
+ r = vprintk_emit(facility, level, NULL, fmt, args);
va_end(args);
return r;
len = info_print_ext_header(user->buf, sizeof(user->buf), r->info);
len += msg_print_ext_body(user->buf + len, sizeof(user->buf) - len,
- &r->dict_buf[0], r->info->dict_len,
- &r->text_buf[0], r->info->text_len);
+ &r->text_buf[0], r->info->text_len,
+ &r->info->dev_info);
user->seq = r->info->seq + 1;
logbuf_unlock_irq();
return ret;
}
+/*
+ * Be careful when modifying this function!!!
+ *
+ * Only few operations are supported because the device works only with the
+ * entire variable length messages (records). Non-standard values are
+ * returned in the other cases and has been this way for quite some time.
+ * User space applications might depend on this behavior.
+ */
static loff_t devkmsg_llseek(struct file *file, loff_t offset, int whence)
{
struct devkmsg_user *user = file->private_data;
mutex_init(&user->lock);
prb_rec_init_rd(&user->record, &user->info,
- &user->text_buf[0], sizeof(user->text_buf),
- &user->dict_buf[0], sizeof(user->dict_buf));
+ &user->text_buf[0], sizeof(user->text_buf));
logbuf_lock_irq();
user->seq = prb_first_valid_seq(prb);
*/
void log_buf_vmcoreinfo_setup(void)
{
+ struct dev_printk_info *dev_info = NULL;
+
VMCOREINFO_SYMBOL(prb);
VMCOREINFO_SYMBOL(printk_rb_static);
VMCOREINFO_SYMBOL(clear_seq);
VMCOREINFO_STRUCT_SIZE(printk_ringbuffer);
VMCOREINFO_OFFSET(printk_ringbuffer, desc_ring);
VMCOREINFO_OFFSET(printk_ringbuffer, text_data_ring);
- VMCOREINFO_OFFSET(printk_ringbuffer, dict_data_ring);
VMCOREINFO_OFFSET(printk_ringbuffer, fail);
VMCOREINFO_STRUCT_SIZE(prb_desc_ring);
VMCOREINFO_STRUCT_SIZE(prb_desc);
VMCOREINFO_OFFSET(prb_desc, state_var);
VMCOREINFO_OFFSET(prb_desc, text_blk_lpos);
- VMCOREINFO_OFFSET(prb_desc, dict_blk_lpos);
VMCOREINFO_STRUCT_SIZE(prb_data_blk_lpos);
VMCOREINFO_OFFSET(prb_data_blk_lpos, begin);
VMCOREINFO_OFFSET(printk_info, seq);
VMCOREINFO_OFFSET(printk_info, ts_nsec);
VMCOREINFO_OFFSET(printk_info, text_len);
- VMCOREINFO_OFFSET(printk_info, dict_len);
VMCOREINFO_OFFSET(printk_info, caller_id);
+ VMCOREINFO_OFFSET(printk_info, dev_info);
+
+ VMCOREINFO_STRUCT_SIZE(dev_printk_info);
+ VMCOREINFO_OFFSET(dev_printk_info, subsystem);
+ VMCOREINFO_LENGTH(printk_info_subsystem, sizeof(dev_info->subsystem));
+ VMCOREINFO_OFFSET(dev_printk_info, device);
+ VMCOREINFO_LENGTH(printk_info_device, sizeof(dev_info->device));
VMCOREINFO_STRUCT_SIZE(prb_data_ring);
VMCOREINFO_OFFSET(prb_data_ring, size_bits);
struct prb_reserved_entry e;
struct printk_record dest_r;
- prb_rec_init_wr(&dest_r, r->info->text_len, r->info->dict_len);
+ prb_rec_init_wr(&dest_r, r->info->text_len);
if (!prb_reserve(&e, rb, &dest_r))
return 0;
memcpy(&dest_r.text_buf[0], &r->text_buf[0], r->info->text_len);
dest_r.info->text_len = r->info->text_len;
- if (dest_r.dict_buf) {
- memcpy(&dest_r.dict_buf[0], &r->dict_buf[0], r->info->dict_len);
- dest_r.info->dict_len = r->info->dict_len;
- }
dest_r.info->facility = r->info->facility;
dest_r.info->level = r->info->level;
dest_r.info->flags = r->info->flags;
dest_r.info->ts_nsec = r->info->ts_nsec;
dest_r.info->caller_id = r->info->caller_id;
+ memcpy(&dest_r.info->dev_info, &r->info->dev_info, sizeof(dest_r.info->dev_info));
prb_final_commit(&e);
return prb_record_text_space(&e);
}
-static char setup_text_buf[CONSOLE_EXT_LOG_MAX] __initdata;
-static char setup_dict_buf[CONSOLE_EXT_LOG_MAX] __initdata;
+static char setup_text_buf[LOG_LINE_MAX] __initdata;
void __init setup_log_buf(int early)
{
size_t new_descs_size;
size_t new_infos_size;
unsigned long flags;
- char *new_dict_buf;
char *new_log_buf;
unsigned int free;
u64 seq;
return;
}
- new_dict_buf = memblock_alloc(new_log_buf_len, LOG_ALIGN);
- if (unlikely(!new_dict_buf)) {
- pr_err("log_buf_len: %lu dict bytes not available\n",
- new_log_buf_len);
- goto err_free_log_buf;
- }
-
new_descs_size = new_descs_count * sizeof(struct prb_desc);
new_descs = memblock_alloc(new_descs_size, LOG_ALIGN);
if (unlikely(!new_descs)) {
pr_err("log_buf_len: %zu desc bytes not available\n",
new_descs_size);
- goto err_free_dict_buf;
+ goto err_free_log_buf;
}
new_infos_size = new_descs_count * sizeof(struct printk_info);
goto err_free_descs;
}
- prb_rec_init_rd(&r, &info,
- &setup_text_buf[0], sizeof(setup_text_buf),
- &setup_dict_buf[0], sizeof(setup_dict_buf));
+ prb_rec_init_rd(&r, &info, &setup_text_buf[0], sizeof(setup_text_buf));
prb_init(&printk_rb_dynamic,
new_log_buf, ilog2(new_log_buf_len),
- new_dict_buf, ilog2(new_log_buf_len),
new_descs, ilog2(new_descs_count),
new_infos);
err_free_descs:
memblock_free(__pa(new_descs), new_descs_size);
-err_free_dict_buf:
- memblock_free(__pa(new_dict_buf), new_log_buf_len);
err_free_log_buf:
memblock_free(__pa(new_log_buf), new_log_buf_len);
}
size_t len = 0;
char *next;
+ /*
+ * If the message was truncated because the buffer was not large
+ * enough, treat the available text as if it were the full text.
+ */
+ if (text_len > buf_size)
+ text_len = buf_size;
+
prefix_len = info_print_prefix(r->info, syslog, time, prefix);
/*
if (!text)
return -ENOMEM;
- prb_rec_init_rd(&r, &info, text, LOG_LINE_MAX + PREFIX_MAX, NULL, 0);
+ prb_rec_init_rd(&r, &info, text, LOG_LINE_MAX + PREFIX_MAX);
while (size > 0) {
size_t n;
len -= get_record_print_text_size(&info, line_count, true, time);
}
- prb_rec_init_rd(&r, &info, text, LOG_LINE_MAX + PREFIX_MAX, NULL, 0);
+ prb_rec_init_rd(&r, &info, text, LOG_LINE_MAX + PREFIX_MAX);
len = 0;
prb_for_each_record(seq, prb, seq, &r) {
/* Read/clear last kernel messages */
case SYSLOG_ACTION_READ_CLEAR:
clear = true;
- /* FALL THRU */
+ fallthrough;
/* Read last kernel messages */
case SYSLOG_ACTION_READ_ALL:
if (!buf || len < 0)
0x80000000 + raw_smp_processor_id();
}
-static size_t log_output(int facility, int level, enum log_flags lflags, const char *dict, size_t dictlen, char *text, size_t text_len)
+static size_t log_output(int facility, int level, enum log_flags lflags,
+ const struct dev_printk_info *dev_info,
+ char *text, size_t text_len)
{
const u32 caller_id = printk_caller_id();
struct prb_reserved_entry e;
struct printk_record r;
- prb_rec_init_wr(&r, text_len, 0);
- if (prb_reserve_in_last(&e, prb, &r, caller_id)) {
+ prb_rec_init_wr(&r, text_len);
+ if (prb_reserve_in_last(&e, prb, &r, caller_id, LOG_LINE_MAX)) {
memcpy(&r.text_buf[r.info->text_len], text, text_len);
r.info->text_len += text_len;
if (lflags & LOG_NEWLINE) {
/* Store it in the record log */
return log_store(caller_id, facility, level, lflags, 0,
- dict, dictlen, text, text_len);
+ dev_info, text, text_len);
}
/* Must be called under logbuf_lock. */
int vprintk_store(int facility, int level,
- const char *dict, size_t dictlen,
+ const struct dev_printk_info *dev_info,
const char *fmt, va_list args)
{
static char textbuf[LOG_LINE_MAX];
if (level == LOGLEVEL_DEFAULT)
level = default_message_loglevel;
- if (dict)
+ if (dev_info)
lflags |= LOG_NEWLINE;
- return log_output(facility, level, lflags,
- dict, dictlen, text, text_len);
+ return log_output(facility, level, lflags, dev_info, text, text_len);
}
asmlinkage int vprintk_emit(int facility, int level,
- const char *dict, size_t dictlen,
+ const struct dev_printk_info *dev_info,
const char *fmt, va_list args)
{
int printed_len;
/* This stops the holder of console_sem just where we want him */
logbuf_lock_irqsave(flags);
- printed_len = vprintk_store(facility, level, dict, dictlen, fmt, args);
+ printed_len = vprintk_store(facility, level, dev_info, fmt, args);
logbuf_unlock_irqrestore(flags);
/* If called from the scheduler, we can not call up(). */
int vprintk_default(const char *fmt, va_list args)
{
- return vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args);
+ return vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, fmt, args);
}
EXPORT_SYMBOL_GPL(vprintk_default);
return 0;
}
static ssize_t msg_print_ext_body(char *buf, size_t size,
- char *dict, size_t dict_len,
- char *text, size_t text_len) { return 0; }
+ char *text, size_t text_len,
+ struct dev_printk_info *dev_info) { return 0; }
static void console_lock_spinning_enable(void) { }
static int console_lock_spinning_disable_and_check(void) { return 0; }
static void call_console_drivers(const char *ext_text, size_t ext_len,
char *s, *options, *brl_options = NULL;
int idx;
- if (str[0] == 0)
+ /*
+ * console="" or console=null have been suggested as a way to
+ * disable console output. Use ttynull that has been created
+ * for exacly this purpose.
+ */
+ if (str[0] == 0 || strcmp(str, "null") == 0) {
+ __add_preferred_console("ttynull", 0, NULL, NULL, true);
return 1;
+ }
if (_braille_console_setup(&str, &brl_options))
return 1;
{
static char ext_text[CONSOLE_EXT_LOG_MAX];
static char text[LOG_LINE_MAX + PREFIX_MAX];
- static char dict[LOG_LINE_MAX];
unsigned long flags;
bool do_cond_resched, retry;
struct printk_info info;
return;
}
- prb_rec_init_rd(&r, &info, text, sizeof(text), dict, sizeof(dict));
+ prb_rec_init_rd(&r, &info, text, sizeof(text));
/*
* Console drivers are called with interrupts disabled, so
*
* console_trylock() is not able to detect the preemptive
* context reliably. Therefore the value must be stored before
- * and cleared after the the "again" goto label.
+ * and cleared after the "again" goto label.
*/
do_cond_resched = console_may_schedule;
again:
r.info);
ext_len += msg_print_ext_body(ext_text + ext_len,
sizeof(ext_text) - ext_len,
- &r.dict_buf[0],
- r.info->dict_len,
&r.text_buf[0],
- r.info->text_len);
+ r.info->text_len,
+ &r.info->dev_info);
}
len = record_print_text(&r,
console_msg_format & MSG_FORMAT_SYSLOG,
static int try_enable_new_console(struct console *newcon, bool user_specified)
{
struct console_cmdline *c;
- int i;
+ int i, err;
for (i = 0, c = console_cmdline;
i < MAX_CMDLINECONSOLES && c->name[0];
return 0;
if (newcon->setup &&
- newcon->setup(newcon, c->options) != 0)
- return -EIO;
+ (err = newcon->setup(newcon, c->options)) != 0)
+ return err;
}
newcon->flags |= CON_ENABLED;
if (i == preferred_console) {
/*
* Some consoles, such as pstore and netconsole, can be enabled even
* without matching. Accept the pre-enabled consoles only when match()
- * and setup() had a change to be called.
+ * and setup() had a chance to be called.
*/
if (newcon->flags & CON_ENABLED && c->user_specified == user_specified)
return 0;
{
int r;
- r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, 0, fmt, args);
+ r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, fmt, args);
defer_console_output();
return r;
size_t l = 0;
bool ret = false;
- prb_rec_init_rd(&r, &info, line, size, NULL, 0);
+ prb_rec_init_rd(&r, &info, line, size);
if (!dumper->active)
goto out;
* @len: length of line placed into buffer
*
* Start at the end of the kmsg buffer and fill the provided buffer
- * with as many of the the *youngest* kmsg records that fit into it.
+ * with as many of the *youngest* kmsg records that fit into it.
* If the buffer is large enough, all available kmsg records will be
* copied with a single call.
*
bool ret = false;
bool time = printk_time;
- prb_rec_init_rd(&r, &info, buf, size, NULL, 0);
+ prb_rec_init_rd(&r, &info, buf, size);
if (!dumper->active || !buf || !size)
goto out;
l += record_print_text(&r, syslog, time);
/* adjust record to store to remaining buffer space */
- prb_rec_init_rd(&r, &info, buf + l, size - l, NULL, 0);
+ prb_rec_init_rd(&r, &info, buf + l, size - l);
seq = r.info->seq + 1;
}
projects / linux-2.6-microblaze.git / blobdiff