linux-kernel - [char-misc-next 10/13] mei: bus: unconditionally enable clients with vtag support

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Message-Id: <20200818115147.2567012-11-tomas.winkler@intel.com>
Date:   Tue, 18 Aug 2020 14:51:44 +0300
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 10/13] mei: bus: unconditionally enable clients with vtag support

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

The list of clients is only visible via mei client bus.
Enabling vtag clients on the mei client bus allows user-space to
enumerate clients with vtag support by traversing the mei bus on sysfs.
This feature is required for ACRN device model service.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/bus-fixup.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 07ba16d46690..4e30fa98fe7d 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -463,6 +463,17 @@ static void mei_nfc(struct mei_cl_device *cldev)
 	dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
 }
 
+/**
+ * vt_support - enable on bus clients with vtag support
+ *
+ * @cldev: me clients device
+ */
+static void vt_support(struct mei_cl_device *cldev)
+{
+	if (cldev->me_cl->props.vt_supported == 1)
+		cldev->do_match = 1;
+}
+
 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
 
 static struct mei_fixup {
@@ -476,6 +487,7 @@ static struct mei_fixup {
 	MEI_FIXUP(MEI_UUID_WD, mei_wd),
 	MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
 	MEI_FIXUP(MEI_UUID_HDCP, whitelist),
+	MEI_FIXUP(MEI_UUID_ANY, vt_support),
 };
 
 /**
-- 
2.25.4