linux-toradex.git/include/linux/pstore.h, branch v4.16-rc4

pstore: Populate pstore record->time field

2017-05-31T17:13:44+00:00

The current time will be initially available in the record->time field
for all pstore_read() and pstore_write() calls. Backends can either
update the field during read(), or use the field during write() instead
of fetching time themselves.

Signed-off-by: Kees Cook

pstore: Remove write_buf() callback

2017-03-07T22:01:02+00:00

Now that write() and write_buf() are functionally identical, this removes
write_buf(), and renames write_buf_user() to write_user(). Additionally
adds sanity-checks for pstore_info's declared functions and flags at
registration time.

Signed-off-by: Kees Cook

pstore: Replace arguments for write_buf_user() API

2017-03-07T22:01:01+00:00

Removes argument list in favor of pstore record, though the user buffer
remains passed separately since it must carry the __user annotation.

Signed-off-by: Kees Cook

pstore: Replace arguments for write_buf() API

2017-03-07T22:01:01+00:00

As with the other API updates, this removes the long argument list in favor
of passing a single pstore recaord.

Signed-off-by: Kees Cook

pstore: Replace arguments for erase() API

2017-03-07T22:01:00+00:00

This removes the argument list for the erase() callback and replaces it
with a pointer to the backend record details to be removed.

Signed-off-by: Kees Cook

pstore: Replace arguments for write() API

2017-03-07T22:00:56+00:00

Similar to the pstore_info read() callback, there were too many arguments.
This switches to the new struct pstore_record pointer instead. This adds
"reason" and "part" to the record structure as well.

Signed-off-by: Kees Cook

pstore: Replace arguments for read() API

2017-03-07T22:00:55+00:00

The argument list for the pstore_read() interface is unwieldy. This changes
passes the new struct pstore_record instead. The erst backend was already
doing something similar internally.

Signed-off-by: Kees Cook

pstore: Extract common arguments into structure

2017-03-07T22:00:53+00:00

The read/mkfile pair pass the same arguments and should be cleared
between calls. Move to a structure and wipe it after every loop.

Signed-off-by: Kees Cook

pstore: Add kernel-doc for struct pstore_info

2017-03-07T22:00:52+00:00

This adds documentation for struct pstore_info, which also includes
the basic API the backends need to implement.

Signed-off-by: Kees Cook

pstore: Add ftrace timestamp counter

2016-11-16T00:34:27+00:00

In preparation for merging the per CPU buffers into one buffer when
we retrieve the pstore ftrace data, we store the timestamp as a
counter in the ftrace pstore record.  We store the CPU number as well
if !PSTORE_CPU_IN_IP, in this case we shift the counter and may lose
ordering there but we preserve the same record size. The timestamp counter
is also racy, and not doing any locking or synchronization here results
in the benefit of lower overhead. Since we don't care much here for exact
ordering of function traces across CPUs, we don't synchronize and may lose
some counter updates but I'm ok with that.

Using trace_clock() results in much lower performance so avoid using it
since we don't want accuracy in timestamp and need a rough ordering to
perform merge.

Signed-off-by: Joel Fernandes 
[kees: updated commit message, added comments]
Signed-off-by: Kees Cook