mei: bus: add vtag support

Add API to support vtag in communication on mei bus.

Add mei_cldev_send_vtag, mei_cldev_recv_vtag and
mei_cldev_recv_nonblock_vtag functions to allow sending a message
with vtag set and to receive vtag of an incoming message.

Cc: Sean Z Huang <sean.z.huang@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20201116125612.1660971-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 84 insertions, 17 deletions

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 7fe48baa103a..2907db260fba 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -26,11 +26,12 @@
  * @cl: host client
  * @buf: buffer to send
  * @length: buffer length
+ * @vtag: virtual tag
  * @mode: sending mode
  *
  * Return: written size bytes or < 0 on error
  */
-ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag,
 		      unsigned int mode)
 {
 	struct mei_device *bus;
@@ -86,6 +87,7 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 		rets = -ENOMEM;
 		goto out;
 	}
+	cb->vtag = vtag;
 
 	cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);
 	cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);
@@ -106,11 +108,12 @@ out:
  * @buf: buffer to receive
  * @length: buffer length
  * @mode: io mode
+ * @vtag: virtual tag
  * @timeout: recv timeout, 0 for infinite timeout
  *
  * Return: read size in bytes of < 0 on error
  */
-ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
+ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag,
 		      unsigned int mode, unsigned long timeout)
 {
 	struct mei_device *bus;
@@ -196,6 +199,8 @@ copy:
 	r_length = min_t(size_t, length, cb->buf_idx);
 	memcpy(buf, cb->buf.data, r_length);
 	rets = r_length;
+	if (vtag)
+		*vtag = cb->vtag;
 
 free:
 	mei_cl_del_rd_completed(cl, cb);
@@ -206,40 +211,87 @@ out:
 }
 
 /**
- * mei_cldev_send - me device send  (write)
+ * mei_cldev_send_vtag - me device send with vtag  (write)
  *
  * @cldev: me client device
  * @buf: buffer to send
  * @length: buffer length
+ * @vtag: virtual tag
  *
- * Return: written size in bytes or < 0 on error
+ * Return:
+ *  * written size in bytes
+ *  * < 0 on error
  */
-ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+
+ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
+			    u8 vtag)
 {
 	struct mei_cl *cl = cldev->cl;
 
-	return __mei_cl_send(cl, buf, length, MEI_CL_IO_TX_BLOCKING);
+	return __mei_cl_send(cl, buf, length, vtag, MEI_CL_IO_TX_BLOCKING);
 }
-EXPORT_SYMBOL_GPL(mei_cldev_send);
+EXPORT_SYMBOL_GPL(mei_cldev_send_vtag);
 
 /**
- * mei_cldev_recv_nonblock - non block client receive (read)
+ * mei_cldev_recv_vtag - client receive with vtag (read)
  *
  * @cldev: me client device
  * @buf: buffer to receive
  * @length: buffer length
+ * @vtag: virtual tag
  *
- * Return: read size in bytes of < 0 on error
- *         -EAGAIN if function will block.
+ * Return:
+ * * read size in bytes
+ * *  < 0 on error
  */
-ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
-				size_t length)
+
+ssize_t mei_cldev_recv_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
+			    u8 *vtag)
 {
 	struct mei_cl *cl = cldev->cl;
 
-	return __mei_cl_recv(cl, buf, length, MEI_CL_IO_RX_NONBLOCK, 0);
+	return __mei_cl_recv(cl, buf, length, vtag, 0, 0);
 }
-EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
+EXPORT_SYMBOL_GPL(mei_cldev_recv_vtag);
+
+/**
+ * mei_cldev_recv_nonblock_vtag - non block client receive with vtag (read)
+ *
+ * @cldev: me client device
+ * @buf: buffer to receive
+ * @length: buffer length
+ * @vtag: virtual tag
+ *
+ * Return:
+ * * read size in bytes
+ * * -EAGAIN if function will block.
+ * * < 0 on other error
+ */
+ssize_t mei_cldev_recv_nonblock_vtag(struct mei_cl_device *cldev, u8 *buf,
+				     size_t length, u8 *vtag)
+{
+	struct mei_cl *cl = cldev->cl;
+
+	return __mei_cl_recv(cl, buf, length, vtag, MEI_CL_IO_RX_NONBLOCK, 0);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock_vtag);
+
+/**
+ * mei_cldev_send - me device send  (write)
+ *
+ * @cldev: me client device
+ * @buf: buffer to send
+ * @length: buffer length
+ *
+ * Return:
+ *  * written size in bytes
+ *  * < 0 on error
+ */
+ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+{
+	return mei_cldev_send_vtag(cldev, buf, length, 0);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_send);
 
 /**
  * mei_cldev_recv - client receive (read)
@@ -252,13 +304,28 @@ EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
  */
 ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
 {
-	struct mei_cl *cl = cldev->cl;
-
-	return __mei_cl_recv(cl, buf, length, 0, 0);
+	return mei_cldev_recv_vtag(cldev, buf, length, NULL);
 }
 EXPORT_SYMBOL_GPL(mei_cldev_recv);
 
 /**
+ * mei_cldev_recv_nonblock - non block client receive (read)
+ *
+ * @cldev: me client device
+ * @buf: buffer to receive
+ * @length: buffer length
+ *
+ * Return: read size in bytes of < 0 on error
+ *         -EAGAIN if function will block.
+ */
+ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
+				size_t length)
+{
+	return mei_cldev_recv_nonblock_vtag(cldev, buf, length, NULL);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
+
+/**
  * mei_cl_bus_rx_work - dispatch rx event for a bus device
  *
  * @work: work