linux-kernel - [PATCH v4 0/3] mailbox queue length check

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Message-ID: <20260203225821.3293475-1-tanmay.shah@amd.com>
Date: Tue, 3 Feb 2026 14:58:19 -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 v4 0/3] mailbox queue length check

Provide mechanism to check mailbox queue length before posting new
message to the mailbox queue. Use this mechanims in xlnx r5 remoteproc
driver.

Changes in v4:
  - %s/msg_slot_ro/tx_slots_avail_ro/
  - do not use msg_count to calculate tx_slots_avail_ro instead modify
    it directly
  - separate xlnx remoteproc driver patch in to two patches


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.

Tanmay Shah (3):
  mailbox: check mailbox queue is full or not
  remoteproc: xlnx: assign mbox client per mbox channel
  remoteproc: xlnx: do not send new mbox notification

 drivers/mailbox/mailbox.c               |  3 +++
 drivers/remoteproc/xlnx_r5_remoteproc.c | 26 +++++++++++++++++++------
 include/linux/mailbox_client.h          |  2 ++
 3 files changed, 25 insertions(+), 6 deletions(-)


base-commit: fa3e2d1dc10864887674c484372a9ccc6a01eb18
-- 
2.34.1