linux-kernel - [PATCH 1/9] mei: bus: add mei_cldev

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Message-ID: <20250710150831.3018674-12-rodrigo.vivi@intel.com>
Date: Thu, 10 Jul 2025 11:08:32 -0400
From: Rodrigo Vivi <rodrigo.vivi@...el.com>
To: <intel-xe@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>
CC: <gregkh@...uxfoundation.org>, <daniele.ceraolospurio@...el.com>,
	<anshuman.gupta@...el.com>, <alexander.usyskin@...el.com>, Badal Nilawar
	<badal.nilawar@...el.com>, Umesh Nerlige Ramappa
	<umesh.nerlige.ramappa@...el.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: [PATCH 1/9] mei: bus: add mei_cldev_mtu interface

From: Alexander Usyskin <alexander.usyskin@...el.com>

Add a new helper function that allows MEI client drivers
to query the maximum transmission unit (MTU) for a connected
MEI client.

This is useful for clients that need to transmit large payloads,
such as firmware blobs, allowing them to determine the maximum
message size that can be safely sent before starting transmission and
size of the buffer to allocate when receiving data.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Badal Nilawar <badal.nilawar@...el.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@...el.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
---

Change in this revision: Proper commit message.

 drivers/misc/mei/bus.c     | 13 +++++++++++++
 include/linux/mei_cl_bus.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 67176caf5416..f860b1b6eda0 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -614,6 +614,19 @@ u8 mei_cldev_ver(const struct mei_cl_device *cldev)
 }
 EXPORT_SYMBOL_GPL(mei_cldev_ver);
 
+/**
+ * mei_cldev_mtu - max message that client can send and receive
+ *
+ * @cldev: mei client device
+ *
+ * Return: mtu or 0 if client is not connected
+ */
+size_t mei_cldev_mtu(const struct mei_cl_device *cldev)
+{
+	return mei_cl_mtu(cldev->cl);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_mtu);
+
 /**
  * mei_cldev_enabled - check whether the device is enabled
  *
diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h
index 725fd7727422..a82755e1fc40 100644
--- a/include/linux/mei_cl_bus.h
+++ b/include/linux/mei_cl_bus.h
@@ -113,6 +113,7 @@ int mei_cldev_register_notif_cb(struct mei_cl_device *cldev,
 				mei_cldev_cb_t notif_cb);
 
 u8 mei_cldev_ver(const struct mei_cl_device *cldev);
+size_t mei_cldev_mtu(const struct mei_cl_device *cldev);
 
 void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev);
 void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data);
-- 
2.49.0