linux-kernel - [PATCH v3 0/2] mailbox queue length check

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Message-ID: <20251217212728.1540043-1-tanmay.shah@amd.com>
Date: Wed, 17 Dec 2025 13:27:26 -0800
From: Tanmay Shah <tanmay.shah@....com>
To: <jassisinghbrar@...il.com>, <andersson@...nel.org>,
	<mathieu.poirier@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
	"Tanmay Shah" <tanmay.shah@....com>
Subject: [PATCH v3 0/2] mailbox queue length check

Provide mechanism to check mailbox queue length before posting new
message to the mailbox queue.

Changes in v3:
  - move msg_slot_ro to mbox_client instead of mbox_chan
  - allocate separate mailbox client to the "tx" mbox channel
  - modify rest of the patch to use msg_slot_ro from mbox_client

Changes in v2:
  - Split patchset in two patches for two different subsystems.
  - Change design and introduce new field per channel to track mbox
    queue length.
  - use this new field in xlnx remoteproc driver to prevent sending new
    messages if no slots available in the mbox tx channel queue.


Note: The patch series is developed on top of latest remoteproc for-next
branch.

Tanmay Shah (2):
  mailbox: check mailbox queue is full or not
  remoteproc: xlnx: do not kick if mbox queue is full

 drivers/mailbox/mailbox.c               |  3 +++
 drivers/remoteproc/xlnx_r5_remoteproc.c | 24 +++++++++++++++++++-----
 include/linux/mailbox_client.h          |  2 ++
 3 files changed, 24 insertions(+), 5 deletions(-)


base-commit: 6a95c70e60a03d83b31b855ce9af8cf6aeec7f90
-- 
2.34.1