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soc: qcom: Add support to dump initial bootup logs

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Add support to dump initial dmesg buffer into a
buffer available in minidump and fulldump.

Make logs copying from log_buf at configurable.
This is required to avoid memory sensitive target
from using this.

Change-Id: I7e4d0ddc138ff09c9cbe7679db5e790cdaf1db5c
Signed-off-by: Prateek Sood <[email protected]>
This commit is contained in:
Prateek Sood 2020-09-02 18:21:16 +05:30
commit b9483eb801
4 changed files with 127 additions and 0 deletions
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44
kernel/printk/printk.c
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@ -612,6 +612,47 @@ static u32 truncate_msg(u16 *text_len, u16 *trunc_msg_len,
return msg_used_size(*text_len + *trunc_msg_len, 0, pad_len);
}
#ifdef CONFIG_QCOM_INITIAL_LOGBUF
static inline void copy_boot_log(struct printk_log *msg)
{
unsigned int bytes_to_copy;
unsigned int avail_buf;
static unsigned int boot_log_offset;
if (!boot_log_buf)
goto out;
avail_buf = boot_log_buf_size - boot_log_offset;
if (!avail_buf || (avail_buf < sizeof(*msg)))
goto out;
if (copy_early_boot_log) {
bytes_to_copy = log_next_idx;
if (avail_buf < bytes_to_copy)
bytes_to_copy = avail_buf;
memcpy(boot_log_buf + boot_log_offset, log_buf, bytes_to_copy);
boot_log_offset += bytes_to_copy;
copy_early_boot_log = false;
goto out;
}
bytes_to_copy = msg->len;
if (!bytes_to_copy)
bytes_to_copy = sizeof(*msg);
if (avail_buf < bytes_to_copy)
bytes_to_copy = avail_buf;
memcpy(boot_log_buf + boot_log_offset, msg, bytes_to_copy);
boot_log_offset += bytes_to_copy;
out:
return;
}
#endif
/* 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,
@ -670,6 +711,9 @@ static int log_store(u32 caller_id, int facility, int level,
/* insert message */
log_next_idx += msg->len;
log_next_seq++;
#ifdef CONFIG_QCOM_INITIAL_LOGBUF
copy_boot_log(msg);
#endif
return msg->text_len;
}