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authorAlexander Usyskin <alexander.usyskin@intel.com>2020-08-18 13:51:43 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-08-18 15:44:44 +0200
commite5617d2bf5492aea96cb99cc772aded46804add3 (patch)
tree6961de098e9334cee9ac41be1fcf43dd9e590f4e /drivers/misc/mei
parentmei: handle tx queue flushing for vtag connections (diff)
downloadlinux-e5617d2bf5492aea96cb99cc772aded46804add3.tar.xz
linux-e5617d2bf5492aea96cb99cc772aded46804add3.zip
mei: bus: use zero vtag for bus clients.
The zero vtag is required for the read flow to work also for devices on the mei client bus. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20200818115147.2567012-10-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei')
-rw-r--r--drivers/misc/mei/bus.c72
1 files changed, 71 insertions, 1 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index fc20a0da5c24..9cdaa7f3af23 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -496,6 +496,68 @@ static void mei_cl_bus_module_put(struct mei_cl_device *cldev)
}
/**
+ * mei_cl_bus_vtag - get bus vtag entry wrapper
+ * The tag for bus client is always first.
+ *
+ * @cl: host client
+ *
+ * Return: bus vtag or NULL
+ */
+static inline struct mei_cl_vtag *mei_cl_bus_vtag(struct mei_cl *cl)
+{
+ return list_first_entry_or_null(&cl->vtag_map,
+ struct mei_cl_vtag, list);
+}
+
+/**
+ * mei_cl_bus_vtag_alloc - add bus client entry to vtag map
+ *
+ * @cldev: me client device
+ *
+ * Return:
+ * * 0 on success
+ * * -ENOMEM if memory allocation failed
+ */
+static int mei_cl_bus_vtag_alloc(struct mei_cl_device *cldev)
+{
+ struct mei_cl *cl = cldev->cl;
+ struct mei_cl_vtag *cl_vtag;
+
+ /*
+ * Bail out if the client does not supports vtags
+ * or has already allocated one
+ */
+ if (mei_cl_vt_support_check(cl) || mei_cl_bus_vtag(cl))
+ return 0;
+
+ cl_vtag = mei_cl_vtag_alloc(NULL, 0);
+ if (IS_ERR(cl_vtag))
+ return -ENOMEM;
+
+ list_add_tail(&cl_vtag->list, &cl->vtag_map);
+
+ return 0;
+}
+
+/**
+ * mei_cl_bus_vtag_free - remove the bus entry from vtag map
+ *
+ * @cldev: me client device
+ */
+static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev)
+{
+ struct mei_cl *cl = cldev->cl;
+ struct mei_cl_vtag *cl_vtag;
+
+ cl_vtag = mei_cl_bus_vtag(cl);
+ if (!cl_vtag)
+ return;
+
+ list_del(&cl_vtag->list);
+ kfree(cl_vtag);
+}
+
+/**
* mei_cldev_enable - enable me client device
* create connection with me client
*
@@ -531,9 +593,15 @@ int mei_cldev_enable(struct mei_cl_device *cldev)
goto out;
}
+ ret = mei_cl_bus_vtag_alloc(cldev);
+ if (ret)
+ goto out;
+
ret = mei_cl_connect(cl, cldev->me_cl, NULL);
- if (ret < 0)
+ if (ret < 0) {
dev_err(&cldev->dev, "cannot connect\n");
+ mei_cl_bus_vtag_free(cldev);
+ }
out:
mutex_unlock(&bus->device_lock);
@@ -586,6 +654,8 @@ int mei_cldev_disable(struct mei_cl_device *cldev)
mutex_lock(&bus->device_lock);
+ mei_cl_bus_vtag_free(cldev);
+
if (!mei_cl_is_connected(cl)) {
dev_dbg(bus->dev, "Already disconnected\n");
err = 0;