tree e1b1f7df95c5e76751c75f3a0c6e7b4e81ee792e
parent 4fd1d5f12a2e09e63e62a3134299a772ea84c445
author Abhishek Pandit-Subedi <abhishekpandit@chromium.org> 1590083616 -0700
committer Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> 1660619565 +0000

FROMLIST: Bluetooth: Add support for hci devcoredump

Add devcoredump APIs to hci core so that drivers only have to provide
the dump skbs instead of managing the synchronization and timeouts.

The devcoredump APIs should be used in the following manner:
 - hci_devcoredump_init is called to allocate the dump.
 - hci_devcoredump_append is called to append any skbs with dump data
   OR hci_devcoredump_append_pattern is called to insert a pattern.
 - hci_devcoredump_complete is called when all dump packets have been
   sent OR hci_devcoredump_abort is called to indicate an error and
   cancel an ongoing dump collection.

The high level APIs just prepare some skbs with the appropriate data and
queue it for the dump to process. Packets part of the crashdump can be
intercepted in the driver in interrupt context and forwarded directly to
the devcoredump APIs.

Internally, there are 5 states for the dump: idle, active, complete,
abort and timeout. A devcoredump will only be in active state after it
has been initialized. Once active, it accepts data to be appended,
patterns to be inserted (i.e. memset) and a completion event or an abort
event to generate a devcoredump. The timeout is initialized at the same
time the dump is initialized (defaulting to 10s) and will be cleared
either when the timeout occurs or the dump is complete or aborted.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Manish Mandlik <mmandlik@google.com>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
(am from https://patchwork.kernel.org/patch/12940740)

BUG=b:154866409
TEST=Build

Change-Id: Iaf638bb9f885f5880ab1b4e7ae2f73dd53a54661
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3760828
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@google.com>
Tested-by: Manish Mandlik <mmandlik@chromium.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Commit-Queue: Manish Mandlik <mmandlik@chromium.org>